nvec.c revision f5e3352e5185ef37700da9a51c333559381fe8fd
1162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich/* 2162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * NVEC: NVIDIA compliant embedded controller interface 3162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * 4162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.lauchpad.net> 5162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * 6162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * Authors: Pierre-Hugues Husson <phhusson@free.fr> 7162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * Ilya Petrov <ilya.muromec@gmail.com> 8162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * Marc Dietrich <marvin24@gmx.de> 9791c4a642721552204d8defdbd6a3e93cd411f79Julian Andres Klode * Julian Andres Klode <jak@jak-linux.org> 10162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * 11162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * This file is subject to the terms and conditions of the GNU General Public 12162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * License. See the file "COPYING" in the main directory of this archive 13162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * for more details. 14162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich * 15162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich */ 16162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich 17162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich/* #define DEBUG */ 1832890b983086136fef8721363a2d3860f337ad53Marc Dietrich 1912b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/kernel.h> 203b769edd58371fb70417c3f43c6d4a2da075703aMarc Dietrich#include <linux/module.h> 210b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode#include <linux/atomic.h> 2212b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/clk.h> 2332890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/completion.h> 2412b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/delay.h> 2512b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/err.h> 2612b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/gpio.h> 2732890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/interrupt.h> 28162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich#include <linux/io.h> 2932890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/irq.h> 307990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich#include <linux/of.h> 317990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich#include <linux/of_gpio.h> 3232890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/list.h> 3312b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/mfd/core.h> 3412b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/mutex.h> 3532890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/notifier.h> 3632890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/platform_device.h> 3712b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/slab.h> 3812b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/spinlock.h> 3912b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <linux/workqueue.h> 40162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich 41162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich#include <mach/clk.h> 4212b5a55d725579d0978da67f26577224a1c40640Julian Andres Klode#include <mach/iomap.h> 43162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich 4432890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include "nvec.h" 4532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 46391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_CNFG 0x00 47391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_CNFG_PACKET_MODE_EN (1<<10) 48391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_CNFG_NEW_MASTER_SFM (1<<11) 49391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_CNFG_DEBOUNCE_CNT_SHIFT 12 50391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode 51391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_CNFG 0x20 52d3f862aec400dd831a4bdbea107fd85419bddab1Julian Andres Klode#define I2C_SL_NEWSL (1<<2) 53391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_NACK (1<<1) 54391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_RESP (1<<0) 55391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_IRQ (1<<3) 56391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define END_TRANS (1<<4) 57391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define RCVD (1<<2) 58391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define RNW (1<<1) 59391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode 60391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_RCVD 0x24 61391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_STATUS 0x28 62391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_ADDR1 0x2c 63391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_ADDR2 0x30 64391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_DELAY_COUNT 0x3c 65391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode 66bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode/** 67bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode * enum nvec_msg_category - Message categories for nvec_msg_alloc() 68bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode * @NVEC_MSG_RX: The message is an incoming message (from EC) 69bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode * @NVEC_MSG_TX: The message is an outgoing message (to EC) 70bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode */ 71bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klodeenum nvec_msg_category { 72bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode NVEC_MSG_RX, 73bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode NVEC_MSG_TX, 74bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode}; 75bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode 76162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrichstatic const unsigned char EC_DISABLE_EVENT_REPORTING[3] = "\x04\x00\x00"; 77162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrichstatic const unsigned char EC_ENABLE_EVENT_REPORTING[3] = "\x04\x00\x01"; 78162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrichstatic const unsigned char EC_GET_FIRMWARE_VERSION[2] = "\x07\x15"; 7932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 8032890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic struct nvec_chip *nvec_power_handle; 8132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 82f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrichstatic struct mfd_cell nvec_devices[] = { 83f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich { 84162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .name = "nvec-kbd", 85162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .id = 1, 86f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich }, 87f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich { 88162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .name = "nvec-mouse", 89162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .id = 1, 90f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich }, 91f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich { 92162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .name = "nvec-power", 93162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .id = 1, 94f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich }, 95f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich { 96162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .name = "nvec-power", 97162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .id = 2, 98f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich }, 9997cc26576fa2b0eb1aad1b29515bb0a32f86c45cIlya Petrov { 10097cc26576fa2b0eb1aad1b29515bb0a32f86c45cIlya Petrov .name = "nvec-leds", 10197cc26576fa2b0eb1aad1b29515bb0a32f86c45cIlya Petrov .id = 1, 10297cc26576fa2b0eb1aad1b29515bb0a32f86c45cIlya Petrov }, 103f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich}; 104f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 105bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 106bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_register_notifier - Register a notifier with nvec 107bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 108bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nb: The notifier block to register 109bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 110bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Registers a notifier with @nvec. The notifier will be added to an atomic 111bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * notifier chain that is called for all received messages except those that 112bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * correspond to a request initiated by nvec_write_sync(). 113bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 11432890b983086136fef8721363a2d3860f337ad53Marc Dietrichint nvec_register_notifier(struct nvec_chip *nvec, struct notifier_block *nb, 115162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich unsigned int events) 11632890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 11732890b983086136fef8721363a2d3860f337ad53Marc Dietrich return atomic_notifier_chain_register(&nvec->notifier_list, nb); 11832890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 11932890b983086136fef8721363a2d3860f337ad53Marc DietrichEXPORT_SYMBOL_GPL(nvec_register_notifier); 12032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 121bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 122bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_status_notifier - The final notifier 123bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 124bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Prints a message about control events not handled in the notifier 125bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * chain. 126bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 127162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrichstatic int nvec_status_notifier(struct notifier_block *nb, 128162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich unsigned long event_type, void *data) 12932890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 13032890b983086136fef8721363a2d3860f337ad53Marc Dietrich unsigned char *msg = (unsigned char *)data; 13132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 132162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich if (event_type != NVEC_CNTL) 13332890b983086136fef8721363a2d3860f337ad53Marc Dietrich return NOTIFY_DONE; 13432890b983086136fef8721363a2d3860f337ad53Marc Dietrich 135a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich printk(KERN_WARNING "unhandled msg type %ld\n", event_type); 136a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich print_hex_dump(KERN_WARNING, "payload: ", DUMP_PREFIX_NONE, 16, 1, 137a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich msg, msg[1] + 2, true); 13832890b983086136fef8721363a2d3860f337ad53Marc Dietrich 13932890b983086136fef8721363a2d3860f337ad53Marc Dietrich return NOTIFY_OK; 14032890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 14132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 142bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 143bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_msg_alloc: 144bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 145bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode * @category: Pool category, see &enum nvec_msg_category 146bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 147bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Allocate a single &struct nvec_msg object from the message pool of 148bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec. The result shall be passed to nvec_msg_free() if no longer 149bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * used. 150bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode * 151bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode * Outgoing messages are placed in the upper 75% of the pool, keeping the 152bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode * lower 25% available for RX buffers only. The reason is to prevent a 153bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode * situation where all buffers are full and a message is thus endlessly 154bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode * retried because the response could never be processed. 155bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 156bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klodestatic struct nvec_msg *nvec_msg_alloc(struct nvec_chip *nvec, 157bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode enum nvec_msg_category category) 1580b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode{ 159bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode int i = (category == NVEC_MSG_TX) ? (NVEC_POOL_SIZE / 4) : 0; 1600b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode 161bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode for (; i < NVEC_POOL_SIZE; i++) { 1620b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode if (atomic_xchg(&nvec->msg_pool[i].used, 1) == 0) { 1630b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode dev_vdbg(nvec->dev, "INFO: Allocate %i\n", i); 1640b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode return &nvec->msg_pool[i]; 1650b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode } 1660b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode } 1670b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode 168bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode dev_err(nvec->dev, "could not allocate %s buffer\n", 169bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode (category == NVEC_MSG_TX) ? "TX" : "RX"); 1700b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode 1710b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode return NULL; 1720b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode} 1730b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode 174bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 175bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_msg_free: 176bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 177bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @msg: A message (must be allocated by nvec_msg_alloc() and belong to @nvec) 178bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 179bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Free the given message 180bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 181198dd26714ba4a60ccc5ce70bc4506613b4f0c2dJulian Andres Klodeinline void nvec_msg_free(struct nvec_chip *nvec, struct nvec_msg *msg) 1820b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode{ 1837b77065793b8de101c7be3829b4ff8a4618a7172Julian Andres Klode if (msg != &nvec->tx_scratch) 1847b77065793b8de101c7be3829b4ff8a4618a7172Julian Andres Klode dev_vdbg(nvec->dev, "INFO: Free %ti\n", msg - nvec->msg_pool); 1850b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode atomic_set(&msg->used, 0); 1860b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode} 187198dd26714ba4a60ccc5ce70bc4506613b4f0c2dJulian Andres KlodeEXPORT_SYMBOL_GPL(nvec_msg_free); 1880b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode 1898517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode/** 1908517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode * nvec_msg_is_event - Return %true if @msg is an event 1918517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode * @msg: A message 1928517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode */ 1938517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klodestatic bool nvec_msg_is_event(struct nvec_msg *msg) 1948517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode{ 1958517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode return msg->data[0] >> 7; 1968517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode} 1978517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode 1988517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode/** 1998517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode * nvec_msg_size - Get the size of a message 2008517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode * @msg: The message to get the size for 2018517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode * 2028517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode * This only works for received messages, not for outgoing messages. 2038517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode */ 2048517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klodestatic size_t nvec_msg_size(struct nvec_msg *msg) 2058517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode{ 2068517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode bool is_event = nvec_msg_is_event(msg); 2078517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode int event_length = (msg->data[0] & 0x60) >> 5; 2088517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode 2098517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode /* for variable size, payload size in byte 1 + count (1) + cmd (1) */ 2108517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode if (!is_event || event_length == NVEC_VAR_SIZE) 2118517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode return (msg->pos || msg->size) ? (msg->data[1] + 2) : 0; 2128517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode else if (event_length == NVEC_2BYTES) 2138517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode return 2; 2148517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode else if (event_length == NVEC_3BYTES) 2158517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode return 3; 2168517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode else 2178517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode return 0; 2188517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode} 2198517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode 220bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 221bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_gpio_set_value - Set the GPIO value 222bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 223bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @value: The value to write (0 or 1) 224bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 225bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Like gpio_set_value(), but generating debugging information 226bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 227e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klodestatic void nvec_gpio_set_value(struct nvec_chip *nvec, int value) 228e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klode{ 229e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klode dev_dbg(nvec->dev, "GPIO changed from %u to %u\n", 230e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klode gpio_get_value(nvec->gpio), value); 231e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klode gpio_set_value(nvec->gpio, value); 232e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klode} 233e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klode 234bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 235bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_write_async - Asynchronously write a message to NVEC 236bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: An nvec_chip instance 237bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @data: The message data, starting with the request type 238bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @size: The size of @data 239bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 240bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Queue a single message to be transferred to the embedded controller 241bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * and return immediately. 242bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 243bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Returns: 0 on success, a negative error code on failure. If a failure 244bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * occured, the nvec driver may print an error. 245bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 2461b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klodeint nvec_write_async(struct nvec_chip *nvec, const unsigned char *data, 247162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich short size) 24832890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 2490cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode struct nvec_msg *msg; 2500cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode unsigned long flags; 25132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 252bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode msg = nvec_msg_alloc(nvec, NVEC_MSG_TX); 253bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode 2541b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode if (msg == NULL) 2551b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode return -ENOMEM; 2561b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode 25732890b983086136fef8721363a2d3860f337ad53Marc Dietrich msg->data[0] = size; 25832890b983086136fef8721363a2d3860f337ad53Marc Dietrich memcpy(msg->data + 1, data, size); 25932890b983086136fef8721363a2d3860f337ad53Marc Dietrich msg->size = size + 1; 26032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 2610cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 26232890b983086136fef8721363a2d3860f337ad53Marc Dietrich list_add_tail(&msg->node, &nvec->tx_data); 2630cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 26432890b983086136fef8721363a2d3860f337ad53Marc Dietrich 2650cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode queue_work(nvec->wq, &nvec->tx_work); 2661b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode 2671b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode return 0; 26832890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 26932890b983086136fef8721363a2d3860f337ad53Marc DietrichEXPORT_SYMBOL(nvec_write_async); 27032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 271bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 272bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_write_sync - Write a message to nvec and read the response 273bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: An &struct nvec_chip 274bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @data: The data to write 275bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @size: The size of @data 276bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 277bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * This is similar to nvec_write_async(), but waits for the 278bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * request to be answered before returning. This function 279bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * uses a mutex and can thus not be called from e.g. 280bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * interrupt handlers. 281bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 282bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Returns: A pointer to the response message on success, 283198dd26714ba4a60ccc5ce70bc4506613b4f0c2dJulian Andres Klode * %NULL on failure. Free with nvec_msg_free() once no longer 284198dd26714ba4a60ccc5ce70bc4506613b4f0c2dJulian Andres Klode * used. 285bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 2860cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klodestruct nvec_msg *nvec_write_sync(struct nvec_chip *nvec, 2870cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode const unsigned char *data, short size) 2880cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode{ 2890cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode struct nvec_msg *msg; 2900cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 2910cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode mutex_lock(&nvec->sync_write_mutex); 2920cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 2930cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->sync_write_pending = (data[1] << 8) + data[0]; 2941b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode 2951b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode if (nvec_write_async(nvec, data, size) < 0) 2961b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode return NULL; 2970cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 2980cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_dbg(nvec->dev, "nvec_sync_write: 0x%04x\n", 2990cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->sync_write_pending); 3000cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (!(wait_for_completion_timeout(&nvec->sync_write, 3010cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode msecs_to_jiffies(2000)))) { 3020cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_warn(nvec->dev, "timeout waiting for sync write to complete\n"); 3030cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode mutex_unlock(&nvec->sync_write_mutex); 3040cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode return NULL; 3050cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 3060cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3070cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_dbg(nvec->dev, "nvec_sync_write: pong!\n"); 3080cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3090cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode msg = nvec->last_sync_msg; 3100cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3110cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode mutex_unlock(&nvec->sync_write_mutex); 3120cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3130cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode return msg; 3140cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode} 3150cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres KlodeEXPORT_SYMBOL(nvec_write_sync); 3160cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 317bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 318bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_request_master - Process outgoing messages 319bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @work: A &struct work_struct (the tx_worker member of &struct nvec_chip) 320bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 321bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Processes all outgoing requests by sending the request and awaiting the 322bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * response, then continuing with the next request. Once a request has a 323bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * matching response, it will be freed and removed from the list. 324bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 32532890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic void nvec_request_master(struct work_struct *work) 32632890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 32732890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_chip *nvec = container_of(work, struct nvec_chip, tx_work); 3280cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode unsigned long flags; 3290cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode long err; 3300cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode struct nvec_msg *msg; 3310cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3320cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 3330cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode while (!list_empty(&nvec->tx_data)) { 3340cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode msg = list_first_entry(&nvec->tx_data, struct nvec_msg, node); 3350cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 3360cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_gpio_set_value(nvec, 0); 3370cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode err = wait_for_completion_interruptible_timeout( 3380cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode &nvec->ec_transfer, msecs_to_jiffies(5000)); 3390cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3400cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (err == 0) { 3410cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_warn(nvec->dev, "timeout waiting for ec transfer\n"); 3420cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_gpio_set_value(nvec, 1); 3430cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode msg->pos = 0; 3440cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 34532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 3460cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 3470cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3480cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (err > 0) { 3490cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode list_del_init(&msg->node); 3500cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_msg_free(nvec, msg); 3510cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 3520cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 3530cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 35432890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 35532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 356bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 357bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * parse_msg - Print some information and call the notifiers on an RX message 358bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 359bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @msg: A message received by @nvec 360bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 361bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Paarse some pieces of the message and then call the chain of notifiers 362bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * registered via nvec_register_notifier. 363bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 36432890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic int parse_msg(struct nvec_chip *nvec, struct nvec_msg *msg) 36532890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 366162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich if ((msg->data[0] & 1 << 7) == 0 && msg->data[3]) { 367162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich dev_err(nvec->dev, "ec responded %02x %02x %02x %02x\n", 368162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich msg->data[0], msg->data[1], msg->data[2], msg->data[3]); 36932890b983086136fef8721363a2d3860f337ad53Marc Dietrich return -EINVAL; 37032890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 37132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 372a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich if ((msg->data[0] >> 7) == 1 && (msg->data[0] & 0x0f) == 5) 373a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich print_hex_dump(KERN_WARNING, "ec system event ", 374a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich DUMP_PREFIX_NONE, 16, 1, msg->data, 375a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich msg->data[1] + 2, true); 37632890b983086136fef8721363a2d3860f337ad53Marc Dietrich 377162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich atomic_notifier_call_chain(&nvec->notifier_list, msg->data[0] & 0x8f, 378162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich msg->data); 37932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 38032890b983086136fef8721363a2d3860f337ad53Marc Dietrich return 0; 38132890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 38232890b983086136fef8721363a2d3860f337ad53Marc Dietrich 383bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 384bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_dispatch - Process messages received from the EC 385bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @work: A &struct work_struct (the tx_worker member of &struct nvec_chip) 386bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 387bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Process messages previously received from the EC and put into the RX 388bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * queue of the &struct nvec_chip instance associated with @work. 389bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 39032890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic void nvec_dispatch(struct work_struct *work) 39132890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 39232890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_chip *nvec = container_of(work, struct nvec_chip, rx_work); 3930cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode unsigned long flags; 39432890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_msg *msg; 39532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 3960cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_irqsave(&nvec->rx_lock, flags); 397162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich while (!list_empty(&nvec->rx_data)) { 39832890b983086136fef8721363a2d3860f337ad53Marc Dietrich msg = list_first_entry(&nvec->rx_data, struct nvec_msg, node); 39932890b983086136fef8721363a2d3860f337ad53Marc Dietrich list_del_init(&msg->node); 4000cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock_irqrestore(&nvec->rx_lock, flags); 40132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 402162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich if (nvec->sync_write_pending == 4030cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (msg->data[2] << 8) + msg->data[0]) { 40432890b983086136fef8721363a2d3860f337ad53Marc Dietrich dev_dbg(nvec->dev, "sync write completed!\n"); 40532890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec->sync_write_pending = 0; 40632890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec->last_sync_msg = msg; 40732890b983086136fef8721363a2d3860f337ad53Marc Dietrich complete(&nvec->sync_write); 40832890b983086136fef8721363a2d3860f337ad53Marc Dietrich } else { 40932890b983086136fef8721363a2d3860f337ad53Marc Dietrich parse_msg(nvec, msg); 4100cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_msg_free(nvec, msg); 41132890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 4120cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_irqsave(&nvec->rx_lock, flags); 41332890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 4140cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock_irqrestore(&nvec->rx_lock, flags); 41532890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 41632890b983086136fef8721363a2d3860f337ad53Marc Dietrich 417bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 418bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_tx_completed - Complete the current transfer 419bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 420bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 421bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * This is called when we have received an END_TRANS on a TX transfer. 422bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 4230cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klodestatic void nvec_tx_completed(struct nvec_chip *nvec) 4240cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode{ 4250cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* We got an END_TRANS, let's skip this, maybe there's an event */ 4260cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (nvec->tx->pos != nvec->tx->size) { 4270cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "premature END_TRANS, resending\n"); 4280cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx->pos = 0; 4290cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_gpio_set_value(nvec, 0); 4300cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else { 4310cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 4320cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 4330cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode} 4340cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 435bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 436bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_rx_completed - Complete the current transfer 437bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 438bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 439bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * This is called when we have received an END_TRANS on a RX transfer. 440bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 4410cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klodestatic void nvec_rx_completed(struct nvec_chip *nvec) 4420cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode{ 443210ceb4f68dcc7bede2e3af547abd6f661a7bfdaJulian Andres Klode if (nvec->rx->pos != nvec_msg_size(nvec->rx)) { 4440cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "RX incomplete: Expected %u bytes, got %u\n", 4450cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (uint) nvec_msg_size(nvec->rx), 4460cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (uint) nvec->rx->pos); 4470cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 448210ceb4f68dcc7bede2e3af547abd6f661a7bfdaJulian Andres Klode nvec_msg_free(nvec, nvec->rx); 449210ceb4f68dcc7bede2e3af547abd6f661a7bfdaJulian Andres Klode nvec->state = 0; 450d6bdcf2e1019351cbc176e963b7756766bdd8721Julian Andres Klode 451d6bdcf2e1019351cbc176e963b7756766bdd8721Julian Andres Klode /* Battery quirk - Often incomplete, and likes to crash */ 452d6bdcf2e1019351cbc176e963b7756766bdd8721Julian Andres Klode if (nvec->rx->data[0] == NVEC_BAT) 453d6bdcf2e1019351cbc176e963b7756766bdd8721Julian Andres Klode complete(&nvec->ec_transfer); 454d6bdcf2e1019351cbc176e963b7756766bdd8721Julian Andres Klode 455210ceb4f68dcc7bede2e3af547abd6f661a7bfdaJulian Andres Klode return; 456210ceb4f68dcc7bede2e3af547abd6f661a7bfdaJulian Andres Klode } 457210ceb4f68dcc7bede2e3af547abd6f661a7bfdaJulian Andres Klode 4580cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock(&nvec->rx_lock); 4590cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 4600cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* add the received data to the work list 4610cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode and move the ring buffer pointer to the next entry */ 4620cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode list_add_tail(&nvec->rx->node, &nvec->rx_data); 4630cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 4640cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock(&nvec->rx_lock); 4650cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 4660cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 4670cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 4680cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (!nvec_msg_is_event(nvec->rx)) 4690cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode complete(&nvec->ec_transfer); 4700cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 4710cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode queue_work(nvec->wq, &nvec->rx_work); 4720cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode} 4730cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 4740cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode/** 4750cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * nvec_invalid_flags - Send an error message about invalid flags and jump 4760cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * @nvec: The nvec device 4770cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * @status: The status flags 4780cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * @reset: Whether we shall jump to state 0. 4790cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode */ 4800cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klodestatic void nvec_invalid_flags(struct nvec_chip *nvec, unsigned int status, 4810cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode bool reset) 4820cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode{ 4830cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "unexpected status flags 0x%02x during state %i\n", 4840cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode status, nvec->state); 4850cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (reset) 4860cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 4870cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode} 4880cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 4890cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode/** 4900cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * nvec_tx_set - Set the message to transfer (nvec->tx) 491bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 492bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 493bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Gets the first entry from the tx_data list of @nvec and sets the 494bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * tx member to it. If the tx_data list is empty, this uses the 495bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * tx_scratch message to send a no operation message. 4960cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode */ 4970cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klodestatic void nvec_tx_set(struct nvec_chip *nvec) 4980cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode{ 4990cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock(&nvec->tx_lock); 5000cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (list_empty(&nvec->tx_data)) { 5010cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "empty tx - sending no-op\n"); 5020cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode memcpy(nvec->tx_scratch.data, "\x02\x07\x02", 3); 5030cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx_scratch.size = 3; 5040cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx_scratch.pos = 0; 5050cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx = &nvec->tx_scratch; 5060cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode list_add_tail(&nvec->tx->node, &nvec->tx_data); 5070cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else { 5080cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx = list_first_entry(&nvec->tx_data, struct nvec_msg, 5090cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode node); 5100cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx->pos = 0; 5110cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 5120cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock(&nvec->tx_lock); 5130cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 5140cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_dbg(nvec->dev, "Sending message of length %u, command 0x%x\n", 5150cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (uint)nvec->tx->size, nvec->tx->data[1]); 5160cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode} 5170cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 5180cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode/** 5190cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * nvec_interrupt - Interrupt handler 5200cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * @irq: The IRQ 5210cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * @dev: The nvec device 522bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 523bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Interrupt handler that fills our RX buffers and empties our TX 524bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * buffers. This uses a finite state machine with ridiculous amounts 525bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * of error checking, in order to be fairly reliable. 5260cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode */ 527f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrichstatic irqreturn_t nvec_interrupt(int irq, void *dev) 52832890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 52932890b983086136fef8721363a2d3860f337ad53Marc Dietrich unsigned long status; 5300cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode unsigned int received = 0; 5310cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode unsigned char to_send = 0xff; 5320cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode const unsigned long irq_mask = I2C_SL_IRQ | END_TRANS | RCVD | RNW; 5330cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode struct nvec_chip *nvec = dev; 5340cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode unsigned int state = nvec->state; 53532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 5360cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode status = readl(nvec->base + I2C_SL_STATUS); 53732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 5380cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* Filter out some errors */ 5390cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if ((status & irq_mask) == 0 && (status & ~irq_mask) != 0) { 5400cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "unexpected irq mask %lx\n", status); 5410cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode return IRQ_HANDLED; 54232890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 5430cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if ((status & I2C_SL_IRQ) == 0) { 5440cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "Spurious IRQ\n"); 54532890b983086136fef8721363a2d3860f337ad53Marc Dietrich return IRQ_HANDLED; 5460cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 54732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 5480cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* The EC did not request a read, so it send us something, read it */ 5490cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if ((status & RNW) == 0) { 5500cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode received = readl(nvec->base + I2C_SL_RCVD); 551162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich if (status & RCVD) 5520cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode writel(0, nvec->base + I2C_SL_RCVD); 5530cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 554162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich 5550cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (status == (I2C_SL_IRQ | RCVD)) 5560cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 5570cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 5580cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode switch (nvec->state) { 5590cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode case 0: /* Verify that its a transfer start, the rest later */ 5600cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (status != (I2C_SL_IRQ | RCVD)) 5610cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_invalid_flags(nvec, status, false); 5620cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode break; 5630cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode case 1: /* command byte */ 5640cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (status != I2C_SL_IRQ) { 5650cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_invalid_flags(nvec, status, true); 56632890b983086136fef8721363a2d3860f337ad53Marc Dietrich } else { 567bb0590e2723eed53b524d61cf011d53fc7280949Julian Andres Klode nvec->rx = nvec_msg_alloc(nvec, NVEC_MSG_RX); 5688da798634343de8dbb8c1593923f8368db69f838Julian Andres Klode /* Should not happen in a normal world */ 5698da798634343de8dbb8c1593923f8368db69f838Julian Andres Klode if (unlikely(nvec->rx == NULL)) { 5708da798634343de8dbb8c1593923f8368db69f838Julian Andres Klode nvec->state = 0; 5718da798634343de8dbb8c1593923f8368db69f838Julian Andres Klode break; 5728da798634343de8dbb8c1593923f8368db69f838Julian Andres Klode } 5730cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx->data[0] = received; 5740cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx->pos = 1; 5750cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 2; 5760cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 5770cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode break; 5780cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode case 2: /* first byte after command */ 5790cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (status == (I2C_SL_IRQ | RNW | RCVD)) { 5800cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode udelay(33); 5810cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (nvec->rx->data[0] != 0x01) { 5820cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, 5830cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode "Read without prior read command\n"); 5840cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 5850cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode break; 58632890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 5870cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_msg_free(nvec, nvec->rx); 5880cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 3; 5890cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_tx_set(nvec); 5900cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode BUG_ON(nvec->tx->size < 1); 5910cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode to_send = nvec->tx->data[0]; 5920cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx->pos = 1; 5930cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else if (status == (I2C_SL_IRQ)) { 5940cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode BUG_ON(nvec->rx == NULL); 5950cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx->data[1] = received; 5960cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx->pos = 2; 5970cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 4; 5980cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else { 5990cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_invalid_flags(nvec, status, true); 60032890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 6010cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode break; 6020cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode case 3: /* EC does a block read, we transmit data */ 6030cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (status & END_TRANS) { 6040cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_tx_completed(nvec); 6050cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else if ((status & RNW) == 0 || (status & RCVD)) { 6060cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_invalid_flags(nvec, status, true); 6070cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else if (nvec->tx && nvec->tx->pos < nvec->tx->size) { 6080cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode to_send = nvec->tx->data[nvec->tx->pos++]; 6090cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else { 6100cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "tx buffer underflow on %p (%u > %u)\n", 6110cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx, 6120cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (uint) (nvec->tx ? nvec->tx->pos : 0), 6130cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (uint) (nvec->tx ? nvec->tx->size : 0)); 6140cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 61532890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 6160cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode break; 6170cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode case 4: /* EC does some write, we read the data */ 6180cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if ((status & (END_TRANS | RNW)) == END_TRANS) 6190cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_rx_completed(nvec); 6200cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode else if (status & (RNW | RCVD)) 6210cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_invalid_flags(nvec, status, true); 6220cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode else if (nvec->rx && nvec->rx->pos < NVEC_MSG_SIZE) 6230cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx->data[nvec->rx->pos++] = received; 6240cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode else 6250cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, 6260cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode "RX buffer overflow on %p: " 6270cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode "Trying to write byte %u of %u\n", 6280cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx, nvec->rx->pos, NVEC_MSG_SIZE); 6290cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode break; 6300cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode default: 6310cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 6320cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 63332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 6340cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* If we are told that a new transfer starts, verify it */ 6350cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if ((status & (RCVD | RNW)) == RCVD) { 6360cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (received != nvec->i2c_addr) 6370cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, 6380cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode "received address 0x%02x, expected 0x%02x\n", 6390cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode received, nvec->i2c_addr); 6400cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 1; 64132890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 6420cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 6430cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* Send data if requested, but not on end of transmission */ 6440cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if ((status & (RNW | END_TRANS)) == RNW) 6450cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode writel(to_send, nvec->base + I2C_SL_RCVD); 6460cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 6470cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* If we have send the first byte */ 6480cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (status == (I2C_SL_IRQ | RNW | RCVD)) 6490cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_gpio_set_value(nvec, 1); 6500cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 6510cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_dbg(nvec->dev, 6520cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode "Handled: %s 0x%02x, %s 0x%02x in state %u [%s%s%s]\n", 6530cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (status & RNW) == 0 ? "received" : "R=", 6540cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode received, 6550cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (status & (RNW | END_TRANS)) ? "sent" : "S=", 6560cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode to_send, 6570cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode state, 6580cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode status & END_TRANS ? " END_TRANS" : "", 6590cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode status & RCVD ? " RCVD" : "", 6600cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode status & RNW ? " RNW" : ""); 6610cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 662de839b8f06bc5dd3f5037c4409a720cbb9bf21c3Julian Andres Klode 663de839b8f06bc5dd3f5037c4409a720cbb9bf21c3Julian Andres Klode /* 664de839b8f06bc5dd3f5037c4409a720cbb9bf21c3Julian Andres Klode * TODO: A correct fix needs to be found for this. 665de839b8f06bc5dd3f5037c4409a720cbb9bf21c3Julian Andres Klode * 666de839b8f06bc5dd3f5037c4409a720cbb9bf21c3Julian Andres Klode * We experience less incomplete messages with this delay than without 667de839b8f06bc5dd3f5037c4409a720cbb9bf21c3Julian Andres Klode * it, but we don't know why. Help is appreciated. 668de839b8f06bc5dd3f5037c4409a720cbb9bf21c3Julian Andres Klode */ 669de839b8f06bc5dd3f5037c4409a720cbb9bf21c3Julian Andres Klode udelay(100); 670de839b8f06bc5dd3f5037c4409a720cbb9bf21c3Julian Andres Klode 67132890b983086136fef8721363a2d3860f337ad53Marc Dietrich return IRQ_HANDLED; 67232890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 67332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 674f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrichstatic void tegra_init_i2c_slave(struct nvec_chip *nvec) 67532890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 67632890b983086136fef8721363a2d3860f337ad53Marc Dietrich u32 val; 67732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 678f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich clk_enable(nvec->i2c_clk); 679f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 680f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich tegra_periph_reset_assert(nvec->i2c_clk); 68132890b983086136fef8721363a2d3860f337ad53Marc Dietrich udelay(2); 682f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich tegra_periph_reset_deassert(nvec->i2c_clk); 68332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 68432890b983086136fef8721363a2d3860f337ad53Marc Dietrich val = I2C_CNFG_NEW_MASTER_SFM | I2C_CNFG_PACKET_MODE_EN | 685ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich (0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT); 686f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich writel(val, nvec->base + I2C_CNFG); 687ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich 688ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich clk_set_rate(nvec->i2c_clk, 8 * 80000); 689ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich 690d3f862aec400dd831a4bdbea107fd85419bddab1Julian Andres Klode writel(I2C_SL_NEWSL, nvec->base + I2C_SL_CNFG); 691ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich writel(0x1E, nvec->base + I2C_SL_DELAY_COUNT); 692ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich 693ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich writel(nvec->i2c_addr>>1, nvec->base + I2C_SL_ADDR1); 694ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich writel(0, nvec->base + I2C_SL_ADDR2); 69532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 696ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich enable_irq(nvec->irq); 697ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich 698ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich clk_disable(nvec->i2c_clk); 699ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich} 700ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich 701ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrichstatic void nvec_disable_i2c_slave(struct nvec_chip *nvec) 702ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich{ 703ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich disable_irq(nvec->irq); 704d3f862aec400dd831a4bdbea107fd85419bddab1Julian Andres Klode writel(I2C_SL_NEWSL | I2C_SL_NACK, nvec->base + I2C_SL_CNFG); 705f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich clk_disable(nvec->i2c_clk); 70632890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 70732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 70832890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic void nvec_power_off(void) 70932890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 71032890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_write_async(nvec_power_handle, EC_DISABLE_EVENT_REPORTING, 3); 71132890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_write_async(nvec_power_handle, "\x04\x01", 2); 71232890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 71332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 71432890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic int __devinit tegra_nvec_probe(struct platform_device *pdev) 71532890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 716f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich int err, ret; 71732890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct clk *i2c_clk; 71832890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_platform_data *pdata = pdev->dev.platform_data; 71932890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_chip *nvec; 72032890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_msg *msg; 721f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich struct resource *res; 722f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich void __iomem *base; 72332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 724f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich nvec = devm_kzalloc(&pdev->dev, sizeof(struct nvec_chip), GFP_KERNEL); 725162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich if (nvec == NULL) { 72632890b983086136fef8721363a2d3860f337ad53Marc Dietrich dev_err(&pdev->dev, "failed to reserve memory\n"); 72732890b983086136fef8721363a2d3860f337ad53Marc Dietrich return -ENOMEM; 72832890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 72932890b983086136fef8721363a2d3860f337ad53Marc Dietrich platform_set_drvdata(pdev, nvec); 73032890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec->dev = &pdev->dev; 7317990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich 7327990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich if (pdata) { 7337990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich nvec->gpio = pdata->gpio; 7347990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich nvec->i2c_addr = pdata->i2c_addr; 7357990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich } else if (nvec->dev->of_node) { 7367990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich nvec->gpio = of_get_named_gpio(nvec->dev->of_node, "request-gpios", 0); 7377990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich if (nvec->gpio < 0) { 7387990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich dev_err(&pdev->dev, "no gpio specified"); 739f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich return -ENODEV; 7407990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich } 7417990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich if (of_property_read_u32(nvec->dev->of_node, "slave-addr", &nvec->i2c_addr)) { 7427990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich dev_err(&pdev->dev, "no i2c address specified"); 743f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich return -ENODEV; 7447990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich } 7457990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich } else { 7467990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich dev_err(&pdev->dev, "no platform data\n"); 747f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich return -ENODEV; 7487990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich } 749f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 750f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 751f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich if (!res) { 752f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich dev_err(&pdev->dev, "no mem resource?\n"); 753f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich return -ENODEV; 75432890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 75532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 756f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich base = devm_request_and_ioremap(&pdev->dev, res); 757f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich if (!base) { 758f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich dev_err(&pdev->dev, "Can't ioremap I2C region\n"); 759f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich return -ENOMEM; 76032890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 76132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 762f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 763f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich if (!res) { 764f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich dev_err(&pdev->dev, "no irq resource?\n"); 765f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich return -ENODEV; 766f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich } 76732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 768f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich i2c_clk = clk_get_sys("tegra-i2c.2", NULL); 769f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich if (IS_ERR(i2c_clk)) { 770f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich dev_err(nvec->dev, "failed to get controller clock\n"); 771f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich return -ENODEV; 77232890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 77332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 774f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich nvec->base = base; 775f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich nvec->irq = res->start; 776f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich nvec->i2c_clk = i2c_clk; 7770cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx = &nvec->msg_pool[0]; 778f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 77932890b983086136fef8721363a2d3860f337ad53Marc Dietrich ATOMIC_INIT_NOTIFIER_HEAD(&nvec->notifier_list); 78032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 78132890b983086136fef8721363a2d3860f337ad53Marc Dietrich init_completion(&nvec->sync_write); 7820cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode init_completion(&nvec->ec_transfer); 7830cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode mutex_init(&nvec->sync_write_mutex); 7840cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_init(&nvec->tx_lock); 7850cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_init(&nvec->rx_lock); 78632890b983086136fef8721363a2d3860f337ad53Marc Dietrich INIT_LIST_HEAD(&nvec->rx_data); 7870cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode INIT_LIST_HEAD(&nvec->tx_data); 78832890b983086136fef8721363a2d3860f337ad53Marc Dietrich INIT_WORK(&nvec->rx_work, nvec_dispatch); 78932890b983086136fef8721363a2d3860f337ad53Marc Dietrich INIT_WORK(&nvec->tx_work, nvec_request_master); 7900cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->wq = alloc_workqueue("nvec", WQ_NON_REENTRANT, 2); 79132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 792f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich err = devm_gpio_request_one(&pdev->dev, nvec->gpio, GPIOF_OUT_INIT_HIGH, 793f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich "nvec gpio"); 794aed92bbcf4ce760c4d7848013a0db3bdd4ae9492Julian Andres Klode if (err < 0) { 795aed92bbcf4ce760c4d7848013a0db3bdd4ae9492Julian Andres Klode dev_err(nvec->dev, "couldn't request gpio\n"); 796f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich destroy_workqueue(nvec->wq); 797f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich return -ENODEV; 798aed92bbcf4ce760c4d7848013a0db3bdd4ae9492Julian Andres Klode } 799aed92bbcf4ce760c4d7848013a0db3bdd4ae9492Julian Andres Klode 800f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich err = devm_request_irq(&pdev->dev, nvec->irq, nvec_interrupt, 0, 801f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich "nvec", nvec); 802f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich if (err) { 803f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich dev_err(nvec->dev, "couldn't request irq\n"); 804f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich destroy_workqueue(nvec->wq); 805f5e3352e5185ef37700da9a51c333559381fe8fdMarc Dietrich return -ENODEV; 806f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich } 807ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich disable_irq(nvec->irq); 808f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 809f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich tegra_init_i2c_slave(nvec); 810f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 811ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich clk_enable(i2c_clk); 812ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich 813f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 81432890b983086136fef8721363a2d3860f337ad53Marc Dietrich /* enable event reporting */ 81532890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_write_async(nvec, EC_ENABLE_EVENT_REPORTING, 816162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich sizeof(EC_ENABLE_EVENT_REPORTING)); 81732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 81832890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec->nvec_status_notifier.notifier_call = nvec_status_notifier; 81932890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_register_notifier(nvec, &nvec->nvec_status_notifier, 0); 82032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 82132890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_power_handle = nvec; 82232890b983086136fef8721363a2d3860f337ad53Marc Dietrich pm_power_off = nvec_power_off; 82332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 82432890b983086136fef8721363a2d3860f337ad53Marc Dietrich /* Get Firmware Version */ 82532890b983086136fef8721363a2d3860f337ad53Marc Dietrich msg = nvec_write_sync(nvec, EC_GET_FIRMWARE_VERSION, 8260cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode sizeof(EC_GET_FIRMWARE_VERSION)); 82732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 8280cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (msg) { 8290cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_warn(nvec->dev, "ec firmware version %02x.%02x.%02x / %02x\n", 8300cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode msg->data[4], msg->data[5], msg->data[6], msg->data[7]); 83132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 8320cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_msg_free(nvec, msg); 8330cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 83432890b983086136fef8721363a2d3860f337ad53Marc Dietrich 835f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich ret = mfd_add_devices(nvec->dev, -1, nvec_devices, 836162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich ARRAY_SIZE(nvec_devices), base, 0); 837162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich if (ret) 838f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich dev_err(nvec->dev, "error adding subdevices\n"); 839f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 84032890b983086136fef8721363a2d3860f337ad53Marc Dietrich /* unmute speakers? */ 8416dca320c8f16b464bb762494b509b2b02897054eMarc Dietrich nvec_write_async(nvec, "\x0d\x10\x59\x95", 4); 84232890b983086136fef8721363a2d3860f337ad53Marc Dietrich 84332890b983086136fef8721363a2d3860f337ad53Marc Dietrich /* enable lid switch event */ 84432890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_write_async(nvec, "\x01\x01\x01\x00\x00\x02\x00", 7); 84532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 84632890b983086136fef8721363a2d3860f337ad53Marc Dietrich /* enable power button event */ 84732890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_write_async(nvec, "\x01\x01\x01\x00\x00\x80\x00", 7); 84832890b983086136fef8721363a2d3860f337ad53Marc Dietrich 84932890b983086136fef8721363a2d3860f337ad53Marc Dietrich return 0; 85032890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 85132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 85232890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic int __devexit tegra_nvec_remove(struct platform_device *pdev) 85332890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 854f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 855f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 856f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich nvec_write_async(nvec, EC_DISABLE_EVENT_REPORTING, 3); 857f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich mfd_remove_devices(nvec->dev); 8580cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode destroy_workqueue(nvec->wq); 859f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 86032890b983086136fef8721363a2d3860f337ad53Marc Dietrich return 0; 86132890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 86232890b983086136fef8721363a2d3860f337ad53Marc Dietrich 86332890b983086136fef8721363a2d3860f337ad53Marc Dietrich#ifdef CONFIG_PM 86432890b983086136fef8721363a2d3860f337ad53Marc Dietrich 86532890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic int tegra_nvec_suspend(struct platform_device *pdev, pm_message_t state) 86632890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 86732890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 8689feeb0147fe6ae3158db5f319faded5e763744f9Marc Dietrich struct nvec_msg *msg; 86932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 87032890b983086136fef8721363a2d3860f337ad53Marc Dietrich dev_dbg(nvec->dev, "suspending\n"); 8719feeb0147fe6ae3158db5f319faded5e763744f9Marc Dietrich 8729feeb0147fe6ae3158db5f319faded5e763744f9Marc Dietrich /* keep these sync or you'll break suspend */ 8739feeb0147fe6ae3158db5f319faded5e763744f9Marc Dietrich msg = nvec_write_sync(nvec, EC_DISABLE_EVENT_REPORTING, 3); 8749feeb0147fe6ae3158db5f319faded5e763744f9Marc Dietrich nvec_msg_free(nvec, msg); 8759feeb0147fe6ae3158db5f319faded5e763744f9Marc Dietrich msg = nvec_write_sync(nvec, "\x04\x02", 2); 8769feeb0147fe6ae3158db5f319faded5e763744f9Marc Dietrich nvec_msg_free(nvec, msg); 8779feeb0147fe6ae3158db5f319faded5e763744f9Marc Dietrich 878ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich nvec_disable_i2c_slave(nvec); 87932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 88032890b983086136fef8721363a2d3860f337ad53Marc Dietrich return 0; 88132890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 88232890b983086136fef8721363a2d3860f337ad53Marc Dietrich 883162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrichstatic int tegra_nvec_resume(struct platform_device *pdev) 884162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich{ 88532890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 88632890b983086136fef8721363a2d3860f337ad53Marc Dietrich 88732890b983086136fef8721363a2d3860f337ad53Marc Dietrich dev_dbg(nvec->dev, "resuming\n"); 888f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich tegra_init_i2c_slave(nvec); 88932890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_write_async(nvec, EC_ENABLE_EVENT_REPORTING, 3); 89032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 89132890b983086136fef8721363a2d3860f337ad53Marc Dietrich return 0; 89232890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 89332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 89432890b983086136fef8721363a2d3860f337ad53Marc Dietrich#else 89532890b983086136fef8721363a2d3860f337ad53Marc Dietrich#define tegra_nvec_suspend NULL 89632890b983086136fef8721363a2d3860f337ad53Marc Dietrich#define tegra_nvec_resume NULL 89732890b983086136fef8721363a2d3860f337ad53Marc Dietrich#endif 89832890b983086136fef8721363a2d3860f337ad53Marc Dietrich 8997990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich/* Match table for of_platform binding */ 9007990b0d7ec449b10da383bab191eb487185aadceMarc Dietrichstatic const struct of_device_id nvidia_nvec_of_match[] __devinitconst = { 9017990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich { .compatible = "nvidia,nvec", }, 9027990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich {}, 9037990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich}; 9047990b0d7ec449b10da383bab191eb487185aadceMarc DietrichMODULE_DEVICE_TABLE(of, nvidia_nvec_of_match); 9057990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich 906162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrichstatic struct platform_driver nvec_device_driver = { 907162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .probe = tegra_nvec_probe, 908162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .remove = __devexit_p(tegra_nvec_remove), 90932890b983086136fef8721363a2d3860f337ad53Marc Dietrich .suspend = tegra_nvec_suspend, 910162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .resume = tegra_nvec_resume, 911162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .driver = { 91232890b983086136fef8721363a2d3860f337ad53Marc Dietrich .name = "nvec", 91332890b983086136fef8721363a2d3860f337ad53Marc Dietrich .owner = THIS_MODULE, 9147990b0d7ec449b10da383bab191eb487185aadceMarc Dietrich .of_match_table = nvidia_nvec_of_match, 91532890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 91632890b983086136fef8721363a2d3860f337ad53Marc Dietrich}; 91732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 91832890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic int __init tegra_nvec_init(void) 91932890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 92032890b983086136fef8721363a2d3860f337ad53Marc Dietrich return platform_driver_register(&nvec_device_driver); 92132890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 92232890b983086136fef8721363a2d3860f337ad53Marc Dietrich 92332890b983086136fef8721363a2d3860f337ad53Marc Dietrichmodule_init(tegra_nvec_init); 924162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich 92532890b983086136fef8721363a2d3860f337ad53Marc DietrichMODULE_ALIAS("platform:nvec"); 926162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc DietrichMODULE_DESCRIPTION("NVIDIA compliant embedded controller interface"); 927162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc DietrichMODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>"); 928162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc DietrichMODULE_LICENSE("GPL"); 929