nvec.c revision 391d2fa95c8e5e5ad3b06af235ce4aeae6514966
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 1932890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <asm/irq.h> 20162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich 210b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode#include <linux/atomic.h> 2232890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/completion.h> 2332890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/interrupt.h> 24162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich#include <linux/io.h> 2532890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/irq.h> 2632890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/slab.h> 2732890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/gpio.h> 2832890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/serio.h> 2932890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/delay.h> 3032890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/input.h> 3132890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/workqueue.h> 3232890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/clk.h> 33162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich 3432890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/semaphore.h> 3532890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/list.h> 3632890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/notifier.h> 3732890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include <linux/platform_device.h> 38f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich#include <linux/mfd/core.h> 39162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich 40162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich#include <mach/iomap.h> 41162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich#include <mach/clk.h> 42162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich 4332890b983086136fef8721363a2d3860f337ad53Marc Dietrich#include "nvec.h" 4432890b983086136fef8721363a2d3860f337ad53Marc Dietrich 45391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_CNFG 0x00 46391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_CNFG_PACKET_MODE_EN (1<<10) 47391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_CNFG_NEW_MASTER_SFM (1<<11) 48391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_CNFG_DEBOUNCE_CNT_SHIFT 12 49391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode 50391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_CNFG 0x20 51391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_NEWL (1<<2) 52391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_NACK (1<<1) 53391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_RESP (1<<0) 54391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_IRQ (1<<3) 55391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define END_TRANS (1<<4) 56391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define RCVD (1<<2) 57391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define RNW (1<<1) 58391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode 59391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_RCVD 0x24 60391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_STATUS 0x28 61391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_ADDR1 0x2c 62391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_ADDR2 0x30 63391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode#define I2C_SL_DELAY_COUNT 0x3c 64391d2fa95c8e5e5ad3b06af235ce4aeae6514966Julian Andres Klode 65162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrichstatic const unsigned char EC_DISABLE_EVENT_REPORTING[3] = "\x04\x00\x00"; 66162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrichstatic const unsigned char EC_ENABLE_EVENT_REPORTING[3] = "\x04\x00\x01"; 67162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrichstatic const unsigned char EC_GET_FIRMWARE_VERSION[2] = "\x07\x15"; 6832890b983086136fef8721363a2d3860f337ad53Marc Dietrich 6932890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic struct nvec_chip *nvec_power_handle; 7032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 71f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrichstatic struct mfd_cell nvec_devices[] = { 72f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich { 73162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .name = "nvec-kbd", 74162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .id = 1, 75f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich }, 76f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich { 77162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .name = "nvec-mouse", 78162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .id = 1, 79f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich }, 80f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich { 81162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .name = "nvec-power", 82162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .id = 1, 83f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich }, 84f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich { 85162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .name = "nvec-power", 86162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .id = 2, 87f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich }, 8897cc26576fa2b0eb1aad1b29515bb0a32f86c45cIlya Petrov { 8997cc26576fa2b0eb1aad1b29515bb0a32f86c45cIlya Petrov .name = "nvec-leds", 9097cc26576fa2b0eb1aad1b29515bb0a32f86c45cIlya Petrov .id = 1, 9197cc26576fa2b0eb1aad1b29515bb0a32f86c45cIlya Petrov }, 92f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich}; 93f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 94bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 95bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_register_notifier - Register a notifier with nvec 96bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 97bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nb: The notifier block to register 98bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 99bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Registers a notifier with @nvec. The notifier will be added to an atomic 100bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * notifier chain that is called for all received messages except those that 101bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * correspond to a request initiated by nvec_write_sync(). 102bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 10332890b983086136fef8721363a2d3860f337ad53Marc Dietrichint nvec_register_notifier(struct nvec_chip *nvec, struct notifier_block *nb, 104162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich unsigned int events) 10532890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 10632890b983086136fef8721363a2d3860f337ad53Marc Dietrich return atomic_notifier_chain_register(&nvec->notifier_list, nb); 10732890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 10832890b983086136fef8721363a2d3860f337ad53Marc DietrichEXPORT_SYMBOL_GPL(nvec_register_notifier); 10932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 110bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 111bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_status_notifier - The final notifier 112bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 113bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Prints a message about control events not handled in the notifier 114bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * chain. 115bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 116162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrichstatic int nvec_status_notifier(struct notifier_block *nb, 117162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich unsigned long event_type, void *data) 11832890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 11932890b983086136fef8721363a2d3860f337ad53Marc Dietrich unsigned char *msg = (unsigned char *)data; 12032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 121162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich if (event_type != NVEC_CNTL) 12232890b983086136fef8721363a2d3860f337ad53Marc Dietrich return NOTIFY_DONE; 12332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 124a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich printk(KERN_WARNING "unhandled msg type %ld\n", event_type); 125a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich print_hex_dump(KERN_WARNING, "payload: ", DUMP_PREFIX_NONE, 16, 1, 126a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich msg, msg[1] + 2, true); 12732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 12832890b983086136fef8721363a2d3860f337ad53Marc Dietrich return NOTIFY_OK; 12932890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 13032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 131bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 132bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_msg_alloc: 133bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 134bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 135bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Allocate a single &struct nvec_msg object from the message pool of 136bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec. The result shall be passed to nvec_msg_free() if no longer 137bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * used. 138bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 1390b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klodestatic struct nvec_msg *nvec_msg_alloc(struct nvec_chip *nvec) 1400b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode{ 1410b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode int i; 1420b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode 1430b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode for (i = 0; i < NVEC_POOL_SIZE; i++) { 1440b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode if (atomic_xchg(&nvec->msg_pool[i].used, 1) == 0) { 1450b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode dev_vdbg(nvec->dev, "INFO: Allocate %i\n", i); 1460b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode return &nvec->msg_pool[i]; 1470b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode } 1480b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode } 1490b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode 1500b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode dev_err(nvec->dev, "could not allocate buffer\n"); 1510b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode 1520b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode return NULL; 1530b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode} 1540b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode 155bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 156bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_msg_free: 157bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 158bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @msg: A message (must be allocated by nvec_msg_alloc() and belong to @nvec) 159bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 160bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Free the given message 161bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 1620b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klodestatic void nvec_msg_free(struct nvec_chip *nvec, struct nvec_msg *msg) 1630b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode{ 1647b77065793b8de101c7be3829b4ff8a4618a7172Julian Andres Klode if (msg != &nvec->tx_scratch) 1657b77065793b8de101c7be3829b4ff8a4618a7172Julian Andres Klode dev_vdbg(nvec->dev, "INFO: Free %ti\n", msg - nvec->msg_pool); 1660b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode atomic_set(&msg->used, 0); 1670b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode} 1680b1076c4b2a06e517fafbb2b4704f23e69b05386Julian Andres Klode 1698517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode/** 1708517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode * nvec_msg_is_event - Return %true if @msg is an event 1718517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode * @msg: A message 1728517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode */ 1738517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klodestatic bool nvec_msg_is_event(struct nvec_msg *msg) 1748517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode{ 1758517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode return msg->data[0] >> 7; 1768517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode} 1778517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode 1788517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode/** 1798517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode * nvec_msg_size - Get the size of a message 1808517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode * @msg: The message to get the size for 1818517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode * 1828517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode * This only works for received messages, not for outgoing messages. 1838517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode */ 1848517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klodestatic size_t nvec_msg_size(struct nvec_msg *msg) 1858517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode{ 1868517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode bool is_event = nvec_msg_is_event(msg); 1878517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode int event_length = (msg->data[0] & 0x60) >> 5; 1888517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode 1898517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode /* for variable size, payload size in byte 1 + count (1) + cmd (1) */ 1908517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode if (!is_event || event_length == NVEC_VAR_SIZE) 1918517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode return (msg->pos || msg->size) ? (msg->data[1] + 2) : 0; 1928517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode else if (event_length == NVEC_2BYTES) 1938517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode return 2; 1948517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode else if (event_length == NVEC_3BYTES) 1958517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode return 3; 1968517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode else 1978517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode return 0; 1988517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode} 1998517e879e0d11a277275616b9e1c749afe2fceffJulian Andres Klode 200bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 201bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_gpio_set_value - Set the GPIO value 202bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 203bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @value: The value to write (0 or 1) 204bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 205bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Like gpio_set_value(), but generating debugging information 206bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 207e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klodestatic void nvec_gpio_set_value(struct nvec_chip *nvec, int value) 208e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klode{ 209e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klode dev_dbg(nvec->dev, "GPIO changed from %u to %u\n", 210e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klode gpio_get_value(nvec->gpio), value); 211e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klode gpio_set_value(nvec->gpio, value); 212e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klode} 213e7c40851fd7989dad297988b6343f4e3cb687292Julian Andres Klode 214bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 215bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_write_async - Asynchronously write a message to NVEC 216bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: An nvec_chip instance 217bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @data: The message data, starting with the request type 218bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @size: The size of @data 219bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 220bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Queue a single message to be transferred to the embedded controller 221bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * and return immediately. 222bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 223bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Returns: 0 on success, a negative error code on failure. If a failure 224bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * occured, the nvec driver may print an error. 225bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 2261b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klodeint nvec_write_async(struct nvec_chip *nvec, const unsigned char *data, 227162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich short size) 22832890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 2290cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode struct nvec_msg *msg; 2300cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode unsigned long flags; 23132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 2320cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode msg = nvec_msg_alloc(nvec); 2331b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode if (msg == NULL) 2341b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode return -ENOMEM; 2351b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode 23632890b983086136fef8721363a2d3860f337ad53Marc Dietrich msg->data[0] = size; 23732890b983086136fef8721363a2d3860f337ad53Marc Dietrich memcpy(msg->data + 1, data, size); 23832890b983086136fef8721363a2d3860f337ad53Marc Dietrich msg->size = size + 1; 23932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 2400cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 24132890b983086136fef8721363a2d3860f337ad53Marc Dietrich list_add_tail(&msg->node, &nvec->tx_data); 2420cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 24332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 2440cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode queue_work(nvec->wq, &nvec->tx_work); 2451b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode 2461b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode return 0; 24732890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 24832890b983086136fef8721363a2d3860f337ad53Marc DietrichEXPORT_SYMBOL(nvec_write_async); 24932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 250bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 251bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_write_sync - Write a message to nvec and read the response 252bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: An &struct nvec_chip 253bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @data: The data to write 254bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @size: The size of @data 255bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 256bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * This is similar to nvec_write_async(), but waits for the 257bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * request to be answered before returning. This function 258bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * uses a mutex and can thus not be called from e.g. 259bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * interrupt handlers. 260bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 261bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Returns: A pointer to the response message on success, 262bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * %NULL on failure. 263bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 2640cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klodestruct nvec_msg *nvec_write_sync(struct nvec_chip *nvec, 2650cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode const unsigned char *data, short size) 2660cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode{ 2670cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode struct nvec_msg *msg; 2680cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 2690cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode mutex_lock(&nvec->sync_write_mutex); 2700cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 2710cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->sync_write_pending = (data[1] << 8) + data[0]; 2721b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode 2731b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode if (nvec_write_async(nvec, data, size) < 0) 2741b9bf629ea42fdacd951b9190f86b028557bbe19Julian Andres Klode return NULL; 2750cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 2760cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_dbg(nvec->dev, "nvec_sync_write: 0x%04x\n", 2770cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->sync_write_pending); 2780cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (!(wait_for_completion_timeout(&nvec->sync_write, 2790cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode msecs_to_jiffies(2000)))) { 2800cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_warn(nvec->dev, "timeout waiting for sync write to complete\n"); 2810cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode mutex_unlock(&nvec->sync_write_mutex); 2820cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode return NULL; 2830cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 2840cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 2850cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_dbg(nvec->dev, "nvec_sync_write: pong!\n"); 2860cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 2870cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode msg = nvec->last_sync_msg; 2880cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 2890cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode mutex_unlock(&nvec->sync_write_mutex); 2900cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 2910cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode return msg; 2920cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode} 2930cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres KlodeEXPORT_SYMBOL(nvec_write_sync); 2940cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 295bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 296bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_request_master - Process outgoing messages 297bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @work: A &struct work_struct (the tx_worker member of &struct nvec_chip) 298bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 299bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Processes all outgoing requests by sending the request and awaiting the 300bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * response, then continuing with the next request. Once a request has a 301bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * matching response, it will be freed and removed from the list. 302bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 30332890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic void nvec_request_master(struct work_struct *work) 30432890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 30532890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_chip *nvec = container_of(work, struct nvec_chip, tx_work); 3060cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode unsigned long flags; 3070cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode long err; 3080cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode struct nvec_msg *msg; 3090cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3100cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 3110cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode while (!list_empty(&nvec->tx_data)) { 3120cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode msg = list_first_entry(&nvec->tx_data, struct nvec_msg, node); 3130cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 3140cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_gpio_set_value(nvec, 0); 3150cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode err = wait_for_completion_interruptible_timeout( 3160cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode &nvec->ec_transfer, msecs_to_jiffies(5000)); 3170cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3180cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (err == 0) { 3190cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_warn(nvec->dev, "timeout waiting for ec transfer\n"); 3200cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_gpio_set_value(nvec, 1); 3210cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode msg->pos = 0; 3220cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 32332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 3240cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_irqsave(&nvec->tx_lock, flags); 3250cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 3260cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (err > 0) { 3270cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode list_del_init(&msg->node); 3280cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_msg_free(nvec, msg); 3290cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 3300cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 3310cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock_irqrestore(&nvec->tx_lock, flags); 33232890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 33332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 334bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 335bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * parse_msg - Print some information and call the notifiers on an RX message 336bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 337bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @msg: A message received by @nvec 338bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 339bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Paarse some pieces of the message and then call the chain of notifiers 340bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * registered via nvec_register_notifier. 341bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 34232890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic int parse_msg(struct nvec_chip *nvec, struct nvec_msg *msg) 34332890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 344162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich if ((msg->data[0] & 1 << 7) == 0 && msg->data[3]) { 345162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich dev_err(nvec->dev, "ec responded %02x %02x %02x %02x\n", 346162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich msg->data[0], msg->data[1], msg->data[2], msg->data[3]); 34732890b983086136fef8721363a2d3860f337ad53Marc Dietrich return -EINVAL; 34832890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 34932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 350a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich if ((msg->data[0] >> 7) == 1 && (msg->data[0] & 0x0f) == 5) 351a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich print_hex_dump(KERN_WARNING, "ec system event ", 352a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich DUMP_PREFIX_NONE, 16, 1, msg->data, 353a3a9aa1a41429b17aa1af20995850ea1b68d5ba2Marc Dietrich msg->data[1] + 2, true); 35432890b983086136fef8721363a2d3860f337ad53Marc Dietrich 355162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich atomic_notifier_call_chain(&nvec->notifier_list, msg->data[0] & 0x8f, 356162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich msg->data); 35732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 35832890b983086136fef8721363a2d3860f337ad53Marc Dietrich return 0; 35932890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 36032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 361bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 362bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_dispatch - Process messages received from the EC 363bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @work: A &struct work_struct (the tx_worker member of &struct nvec_chip) 364bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 365bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Process messages previously received from the EC and put into the RX 366bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * queue of the &struct nvec_chip instance associated with @work. 367bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 36832890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic void nvec_dispatch(struct work_struct *work) 36932890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 37032890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_chip *nvec = container_of(work, struct nvec_chip, rx_work); 3710cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode unsigned long flags; 37232890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_msg *msg; 37332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 3740cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_irqsave(&nvec->rx_lock, flags); 375162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich while (!list_empty(&nvec->rx_data)) { 37632890b983086136fef8721363a2d3860f337ad53Marc Dietrich msg = list_first_entry(&nvec->rx_data, struct nvec_msg, node); 37732890b983086136fef8721363a2d3860f337ad53Marc Dietrich list_del_init(&msg->node); 3780cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock_irqrestore(&nvec->rx_lock, flags); 37932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 380162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich if (nvec->sync_write_pending == 3810cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (msg->data[2] << 8) + msg->data[0]) { 38232890b983086136fef8721363a2d3860f337ad53Marc Dietrich dev_dbg(nvec->dev, "sync write completed!\n"); 38332890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec->sync_write_pending = 0; 38432890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec->last_sync_msg = msg; 38532890b983086136fef8721363a2d3860f337ad53Marc Dietrich complete(&nvec->sync_write); 38632890b983086136fef8721363a2d3860f337ad53Marc Dietrich } else { 38732890b983086136fef8721363a2d3860f337ad53Marc Dietrich parse_msg(nvec, msg); 3880cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_msg_free(nvec, msg); 38932890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 3900cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_irqsave(&nvec->rx_lock, flags); 39132890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 3920cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock_irqrestore(&nvec->rx_lock, flags); 39332890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 39432890b983086136fef8721363a2d3860f337ad53Marc Dietrich 395bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 396bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_tx_completed - Complete the current transfer 397bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 398bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 399bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * This is called when we have received an END_TRANS on a TX transfer. 400bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 4010cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klodestatic void nvec_tx_completed(struct nvec_chip *nvec) 4020cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode{ 4030cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* We got an END_TRANS, let's skip this, maybe there's an event */ 4040cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (nvec->tx->pos != nvec->tx->size) { 4050cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "premature END_TRANS, resending\n"); 4060cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx->pos = 0; 4070cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_gpio_set_value(nvec, 0); 4080cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else { 4090cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 4100cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 4110cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode} 4120cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 413bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode/** 414bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * nvec_rx_completed - Complete the current transfer 415bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 416bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 417bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * This is called when we have received an END_TRANS on a RX transfer. 418bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode */ 4190cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klodestatic void nvec_rx_completed(struct nvec_chip *nvec) 4200cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode{ 4210cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (nvec->rx->pos != nvec_msg_size(nvec->rx)) 4220cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "RX incomplete: Expected %u bytes, got %u\n", 4230cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (uint) nvec_msg_size(nvec->rx), 4240cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (uint) nvec->rx->pos); 4250cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 4260cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock(&nvec->rx_lock); 4270cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 4280cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* add the received data to the work list 4290cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode and move the ring buffer pointer to the next entry */ 4300cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode list_add_tail(&nvec->rx->node, &nvec->rx_data); 4310cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 4320cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock(&nvec->rx_lock); 4330cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 4340cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 4350cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 4360cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (!nvec_msg_is_event(nvec->rx)) 4370cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode complete(&nvec->ec_transfer); 4380cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 4390cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode queue_work(nvec->wq, &nvec->rx_work); 4400cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode} 4410cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 4420cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode/** 4430cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * nvec_invalid_flags - Send an error message about invalid flags and jump 4440cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * @nvec: The nvec device 4450cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * @status: The status flags 4460cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * @reset: Whether we shall jump to state 0. 4470cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode */ 4480cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klodestatic void nvec_invalid_flags(struct nvec_chip *nvec, unsigned int status, 4490cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode bool reset) 4500cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode{ 4510cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "unexpected status flags 0x%02x during state %i\n", 4520cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode status, nvec->state); 4530cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (reset) 4540cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 4550cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode} 4560cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 4570cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode/** 4580cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * nvec_tx_set - Set the message to transfer (nvec->tx) 459bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * @nvec: A &struct nvec_chip 460bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 461bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Gets the first entry from the tx_data list of @nvec and sets the 462bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * tx member to it. If the tx_data list is empty, this uses the 463bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * tx_scratch message to send a no operation message. 4640cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode */ 4650cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klodestatic void nvec_tx_set(struct nvec_chip *nvec) 4660cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode{ 4670cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock(&nvec->tx_lock); 4680cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (list_empty(&nvec->tx_data)) { 4690cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "empty tx - sending no-op\n"); 4700cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode memcpy(nvec->tx_scratch.data, "\x02\x07\x02", 3); 4710cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx_scratch.size = 3; 4720cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx_scratch.pos = 0; 4730cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx = &nvec->tx_scratch; 4740cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode list_add_tail(&nvec->tx->node, &nvec->tx_data); 4750cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else { 4760cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx = list_first_entry(&nvec->tx_data, struct nvec_msg, 4770cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode node); 4780cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx->pos = 0; 4790cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 4800cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_unlock(&nvec->tx_lock); 4810cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 4820cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_dbg(nvec->dev, "Sending message of length %u, command 0x%x\n", 4830cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (uint)nvec->tx->size, nvec->tx->data[1]); 4840cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode} 4850cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 4860cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode/** 4870cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * nvec_interrupt - Interrupt handler 4880cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * @irq: The IRQ 4890cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode * @dev: The nvec device 490bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * 491bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * Interrupt handler that fills our RX buffers and empties our TX 492bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * buffers. This uses a finite state machine with ridiculous amounts 493bdf034d98676d143cb88f7b999a71fff5775fcd4Julian Andres Klode * of error checking, in order to be fairly reliable. 4940cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode */ 495f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrichstatic irqreturn_t nvec_interrupt(int irq, void *dev) 49632890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 49732890b983086136fef8721363a2d3860f337ad53Marc Dietrich unsigned long status; 4980cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode unsigned int received = 0; 4990cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode unsigned char to_send = 0xff; 5000cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode const unsigned long irq_mask = I2C_SL_IRQ | END_TRANS | RCVD | RNW; 5010cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode struct nvec_chip *nvec = dev; 5020cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode unsigned int state = nvec->state; 50332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 5040cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode status = readl(nvec->base + I2C_SL_STATUS); 50532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 5060cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* Filter out some errors */ 5070cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if ((status & irq_mask) == 0 && (status & ~irq_mask) != 0) { 5080cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "unexpected irq mask %lx\n", status); 5090cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode return IRQ_HANDLED; 51032890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 5110cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if ((status & I2C_SL_IRQ) == 0) { 5120cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "Spurious IRQ\n"); 51332890b983086136fef8721363a2d3860f337ad53Marc Dietrich return IRQ_HANDLED; 5140cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 51532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 5160cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* The EC did not request a read, so it send us something, read it */ 5170cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if ((status & RNW) == 0) { 5180cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode received = readl(nvec->base + I2C_SL_RCVD); 519162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich if (status & RCVD) 5200cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode writel(0, nvec->base + I2C_SL_RCVD); 5210cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 522162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich 5230cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (status == (I2C_SL_IRQ | RCVD)) 5240cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 5250cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 5260cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode switch (nvec->state) { 5270cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode case 0: /* Verify that its a transfer start, the rest later */ 5280cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (status != (I2C_SL_IRQ | RCVD)) 5290cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_invalid_flags(nvec, status, false); 5300cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode break; 5310cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode case 1: /* command byte */ 5320cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (status != I2C_SL_IRQ) { 5330cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_invalid_flags(nvec, status, true); 53432890b983086136fef8721363a2d3860f337ad53Marc Dietrich } else { 5350cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx = nvec_msg_alloc(nvec); 5360cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx->data[0] = received; 5370cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx->pos = 1; 5380cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 2; 5390cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 5400cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode break; 5410cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode case 2: /* first byte after command */ 5420cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (status == (I2C_SL_IRQ | RNW | RCVD)) { 5430cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode udelay(33); 5440cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (nvec->rx->data[0] != 0x01) { 5450cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, 5460cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode "Read without prior read command\n"); 5470cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 5480cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode break; 54932890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 5500cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_msg_free(nvec, nvec->rx); 5510cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 3; 5520cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_tx_set(nvec); 5530cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode BUG_ON(nvec->tx->size < 1); 5540cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode to_send = nvec->tx->data[0]; 5550cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx->pos = 1; 5560cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else if (status == (I2C_SL_IRQ)) { 5570cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode BUG_ON(nvec->rx == NULL); 5580cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx->data[1] = received; 5590cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx->pos = 2; 5600cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 4; 5610cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else { 5620cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_invalid_flags(nvec, status, true); 56332890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 5640cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode break; 5650cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode case 3: /* EC does a block read, we transmit data */ 5660cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (status & END_TRANS) { 5670cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_tx_completed(nvec); 5680cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else if ((status & RNW) == 0 || (status & RCVD)) { 5690cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_invalid_flags(nvec, status, true); 5700cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else if (nvec->tx && nvec->tx->pos < nvec->tx->size) { 5710cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode to_send = nvec->tx->data[nvec->tx->pos++]; 5720cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } else { 5730cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, "tx buffer underflow on %p (%u > %u)\n", 5740cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->tx, 5750cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (uint) (nvec->tx ? nvec->tx->pos : 0), 5760cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (uint) (nvec->tx ? nvec->tx->size : 0)); 5770cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 57832890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 5790cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode break; 5800cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode case 4: /* EC does some write, we read the data */ 5810cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if ((status & (END_TRANS | RNW)) == END_TRANS) 5820cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_rx_completed(nvec); 5830cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode else if (status & (RNW | RCVD)) 5840cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_invalid_flags(nvec, status, true); 5850cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode else if (nvec->rx && nvec->rx->pos < NVEC_MSG_SIZE) 5860cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx->data[nvec->rx->pos++] = received; 5870cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode else 5880cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, 5890cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode "RX buffer overflow on %p: " 5900cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode "Trying to write byte %u of %u\n", 5910cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx, nvec->rx->pos, NVEC_MSG_SIZE); 5920cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode break; 5930cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode default: 5940cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 0; 5950cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 59632890b983086136fef8721363a2d3860f337ad53Marc Dietrich 5970cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* If we are told that a new transfer starts, verify it */ 5980cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if ((status & (RCVD | RNW)) == RCVD) { 5990cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (received != nvec->i2c_addr) 6000cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_err(nvec->dev, 6010cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode "received address 0x%02x, expected 0x%02x\n", 6020cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode received, nvec->i2c_addr); 6030cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->state = 1; 60432890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 6050cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 6060cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* Send data if requested, but not on end of transmission */ 6070cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if ((status & (RNW | END_TRANS)) == RNW) 6080cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode writel(to_send, nvec->base + I2C_SL_RCVD); 6090cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 6100cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode /* If we have send the first byte */ 6110cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (status == (I2C_SL_IRQ | RNW | RCVD)) 6120cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_gpio_set_value(nvec, 1); 6130cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 6140cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_dbg(nvec->dev, 6150cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode "Handled: %s 0x%02x, %s 0x%02x in state %u [%s%s%s]\n", 6160cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (status & RNW) == 0 ? "received" : "R=", 6170cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode received, 6180cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode (status & (RNW | END_TRANS)) ? "sent" : "S=", 6190cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode to_send, 6200cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode state, 6210cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode status & END_TRANS ? " END_TRANS" : "", 6220cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode status & RCVD ? " RCVD" : "", 6230cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode status & RNW ? " RNW" : ""); 6240cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode 62532890b983086136fef8721363a2d3860f337ad53Marc Dietrich return IRQ_HANDLED; 62632890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 62732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 628f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrichstatic void tegra_init_i2c_slave(struct nvec_chip *nvec) 62932890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 63032890b983086136fef8721363a2d3860f337ad53Marc Dietrich u32 val; 63132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 632f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich clk_enable(nvec->i2c_clk); 633f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 634f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich tegra_periph_reset_assert(nvec->i2c_clk); 63532890b983086136fef8721363a2d3860f337ad53Marc Dietrich udelay(2); 636f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich tegra_periph_reset_deassert(nvec->i2c_clk); 63732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 63832890b983086136fef8721363a2d3860f337ad53Marc Dietrich val = I2C_CNFG_NEW_MASTER_SFM | I2C_CNFG_PACKET_MODE_EN | 639ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich (0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT); 640f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich writel(val, nvec->base + I2C_CNFG); 641ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich 642ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich clk_set_rate(nvec->i2c_clk, 8 * 80000); 643ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich 644f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich writel(I2C_SL_NEWL, nvec->base + I2C_SL_CNFG); 645ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich writel(0x1E, nvec->base + I2C_SL_DELAY_COUNT); 646ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich 647ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich writel(nvec->i2c_addr>>1, nvec->base + I2C_SL_ADDR1); 648ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich writel(0, nvec->base + I2C_SL_ADDR2); 64932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 650ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich enable_irq(nvec->irq); 651ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich 652ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich clk_disable(nvec->i2c_clk); 653ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich} 654ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich 655ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrichstatic void nvec_disable_i2c_slave(struct nvec_chip *nvec) 656ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich{ 657ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich disable_irq(nvec->irq); 658ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich writel(I2C_SL_NEWL | I2C_SL_NACK, nvec->base + I2C_SL_CNFG); 659f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich clk_disable(nvec->i2c_clk); 66032890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 66132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 66232890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic void nvec_power_off(void) 66332890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 66432890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_write_async(nvec_power_handle, EC_DISABLE_EVENT_REPORTING, 3); 66532890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_write_async(nvec_power_handle, "\x04\x01", 2); 66632890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 66732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 66832890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic int __devinit tegra_nvec_probe(struct platform_device *pdev) 66932890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 670f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich int err, ret; 67132890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct clk *i2c_clk; 67232890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_platform_data *pdata = pdev->dev.platform_data; 67332890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_chip *nvec; 67432890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_msg *msg; 675f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich struct resource *res; 676f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich struct resource *iomem; 677f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich void __iomem *base; 67832890b983086136fef8721363a2d3860f337ad53Marc Dietrich 67932890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec = kzalloc(sizeof(struct nvec_chip), GFP_KERNEL); 680162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich if (nvec == NULL) { 68132890b983086136fef8721363a2d3860f337ad53Marc Dietrich dev_err(&pdev->dev, "failed to reserve memory\n"); 68232890b983086136fef8721363a2d3860f337ad53Marc Dietrich return -ENOMEM; 68332890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 68432890b983086136fef8721363a2d3860f337ad53Marc Dietrich platform_set_drvdata(pdev, nvec); 68532890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec->dev = &pdev->dev; 68632890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec->gpio = pdata->gpio; 687f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich nvec->i2c_addr = pdata->i2c_addr; 688f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 689f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 690f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich if (!res) { 691f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich dev_err(&pdev->dev, "no mem resource?\n"); 692f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich return -ENODEV; 69332890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 69432890b983086136fef8721363a2d3860f337ad53Marc Dietrich 695f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich iomem = request_mem_region(res->start, resource_size(res), pdev->name); 696f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich if (!iomem) { 697f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich dev_err(&pdev->dev, "I2C region already claimed\n"); 698f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich return -EBUSY; 699f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich } 70032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 701f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich base = ioremap(iomem->start, resource_size(iomem)); 702f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich if (!base) { 703f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich dev_err(&pdev->dev, "Can't ioremap I2C region\n"); 704f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich return -ENOMEM; 70532890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 70632890b983086136fef8721363a2d3860f337ad53Marc Dietrich 707f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 708f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich if (!res) { 709f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich dev_err(&pdev->dev, "no irq resource?\n"); 710f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich ret = -ENODEV; 711f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich goto err_iounmap; 712f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich } 71332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 714f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich i2c_clk = clk_get_sys("tegra-i2c.2", NULL); 715f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich if (IS_ERR(i2c_clk)) { 716f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich dev_err(nvec->dev, "failed to get controller clock\n"); 717f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich goto err_iounmap; 71832890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 71932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 720f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich nvec->base = base; 721f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich nvec->irq = res->start; 722f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich nvec->i2c_clk = i2c_clk; 7230cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->rx = &nvec->msg_pool[0]; 724f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 72532890b983086136fef8721363a2d3860f337ad53Marc Dietrich /* Set the gpio to low when we've got something to say */ 72632890b983086136fef8721363a2d3860f337ad53Marc Dietrich err = gpio_request(nvec->gpio, "nvec gpio"); 727162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich if (err < 0) 72832890b983086136fef8721363a2d3860f337ad53Marc Dietrich dev_err(nvec->dev, "couldn't request gpio\n"); 72932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 73032890b983086136fef8721363a2d3860f337ad53Marc Dietrich ATOMIC_INIT_NOTIFIER_HEAD(&nvec->notifier_list); 73132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 73232890b983086136fef8721363a2d3860f337ad53Marc Dietrich init_completion(&nvec->sync_write); 7330cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode init_completion(&nvec->ec_transfer); 7340cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode mutex_init(&nvec->sync_write_mutex); 7350cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_init(&nvec->tx_lock); 7360cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode spin_lock_init(&nvec->rx_lock); 73732890b983086136fef8721363a2d3860f337ad53Marc Dietrich INIT_LIST_HEAD(&nvec->rx_data); 7380cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode INIT_LIST_HEAD(&nvec->tx_data); 73932890b983086136fef8721363a2d3860f337ad53Marc Dietrich INIT_WORK(&nvec->rx_work, nvec_dispatch); 74032890b983086136fef8721363a2d3860f337ad53Marc Dietrich INIT_WORK(&nvec->tx_work, nvec_request_master); 7410cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec->wq = alloc_workqueue("nvec", WQ_NON_REENTRANT, 2); 74232890b983086136fef8721363a2d3860f337ad53Marc Dietrich 743f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich err = request_irq(nvec->irq, nvec_interrupt, 0, "nvec", nvec); 744f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich if (err) { 745f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich dev_err(nvec->dev, "couldn't request irq\n"); 746f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich goto failed; 747f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich } 748ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich disable_irq(nvec->irq); 749f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 750f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich tegra_init_i2c_slave(nvec); 751f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 752ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich clk_enable(i2c_clk); 753ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich 754f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich gpio_direction_output(nvec->gpio, 1); 755f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich gpio_set_value(nvec->gpio, 1); 756f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 75732890b983086136fef8721363a2d3860f337ad53Marc Dietrich /* enable event reporting */ 75832890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_write_async(nvec, EC_ENABLE_EVENT_REPORTING, 759162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich sizeof(EC_ENABLE_EVENT_REPORTING)); 76032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 76132890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec->nvec_status_notifier.notifier_call = nvec_status_notifier; 76232890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_register_notifier(nvec, &nvec->nvec_status_notifier, 0); 76332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 76432890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_power_handle = nvec; 76532890b983086136fef8721363a2d3860f337ad53Marc Dietrich pm_power_off = nvec_power_off; 76632890b983086136fef8721363a2d3860f337ad53Marc Dietrich 76732890b983086136fef8721363a2d3860f337ad53Marc Dietrich /* Get Firmware Version */ 76832890b983086136fef8721363a2d3860f337ad53Marc Dietrich msg = nvec_write_sync(nvec, EC_GET_FIRMWARE_VERSION, 7690cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode sizeof(EC_GET_FIRMWARE_VERSION)); 77032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 7710cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode if (msg) { 7720cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode dev_warn(nvec->dev, "ec firmware version %02x.%02x.%02x / %02x\n", 7730cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode msg->data[4], msg->data[5], msg->data[6], msg->data[7]); 77432890b983086136fef8721363a2d3860f337ad53Marc Dietrich 7750cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode nvec_msg_free(nvec, msg); 7760cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode } 77732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 778f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich ret = mfd_add_devices(nvec->dev, -1, nvec_devices, 779162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich ARRAY_SIZE(nvec_devices), base, 0); 780162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich if (ret) 781f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich dev_err(nvec->dev, "error adding subdevices\n"); 782f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 78332890b983086136fef8721363a2d3860f337ad53Marc Dietrich /* unmute speakers? */ 7846dca320c8f16b464bb762494b509b2b02897054eMarc Dietrich nvec_write_async(nvec, "\x0d\x10\x59\x95", 4); 78532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 78632890b983086136fef8721363a2d3860f337ad53Marc Dietrich /* enable lid switch event */ 78732890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_write_async(nvec, "\x01\x01\x01\x00\x00\x02\x00", 7); 78832890b983086136fef8721363a2d3860f337ad53Marc Dietrich 78932890b983086136fef8721363a2d3860f337ad53Marc Dietrich /* enable power button event */ 79032890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_write_async(nvec, "\x01\x01\x01\x00\x00\x80\x00", 7); 79132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 79232890b983086136fef8721363a2d3860f337ad53Marc Dietrich return 0; 79332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 794f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietricherr_iounmap: 795f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich iounmap(base); 79632890b983086136fef8721363a2d3860f337ad53Marc Dietrichfailed: 79732890b983086136fef8721363a2d3860f337ad53Marc Dietrich kfree(nvec); 79832890b983086136fef8721363a2d3860f337ad53Marc Dietrich return -ENOMEM; 79932890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 80032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 80132890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic int __devexit tegra_nvec_remove(struct platform_device *pdev) 80232890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 803f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 804f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 805f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich nvec_write_async(nvec, EC_DISABLE_EVENT_REPORTING, 3); 806f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich mfd_remove_devices(nvec->dev); 807f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich free_irq(nvec->irq, &nvec_interrupt); 808f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich iounmap(nvec->base); 809f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich gpio_free(nvec->gpio); 8100cab4cb8526d7367c912c9a871d3ad1a9ac1fbf0Julian Andres Klode destroy_workqueue(nvec->wq); 811f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich kfree(nvec); 812f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich 81332890b983086136fef8721363a2d3860f337ad53Marc Dietrich return 0; 81432890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 81532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 81632890b983086136fef8721363a2d3860f337ad53Marc Dietrich#ifdef CONFIG_PM 81732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 81832890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic int tegra_nvec_suspend(struct platform_device *pdev, pm_message_t state) 81932890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 82032890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 82132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 82232890b983086136fef8721363a2d3860f337ad53Marc Dietrich dev_dbg(nvec->dev, "suspending\n"); 82332890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_write_async(nvec, EC_DISABLE_EVENT_REPORTING, 3); 82432890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_write_async(nvec, "\x04\x02", 2); 825ac8107599e47b0f4638f4f3fb0141bbcf0cb142bMarc Dietrich nvec_disable_i2c_slave(nvec); 82632890b983086136fef8721363a2d3860f337ad53Marc Dietrich 82732890b983086136fef8721363a2d3860f337ad53Marc Dietrich return 0; 82832890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 82932890b983086136fef8721363a2d3860f337ad53Marc Dietrich 830162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrichstatic int tegra_nvec_resume(struct platform_device *pdev) 831162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich{ 83232890b983086136fef8721363a2d3860f337ad53Marc Dietrich struct nvec_chip *nvec = platform_get_drvdata(pdev); 83332890b983086136fef8721363a2d3860f337ad53Marc Dietrich 83432890b983086136fef8721363a2d3860f337ad53Marc Dietrich dev_dbg(nvec->dev, "resuming\n"); 835f686e9affba24cfdf94fb155aaeb36a1e14719f1Marc Dietrich tegra_init_i2c_slave(nvec); 83632890b983086136fef8721363a2d3860f337ad53Marc Dietrich nvec_write_async(nvec, EC_ENABLE_EVENT_REPORTING, 3); 83732890b983086136fef8721363a2d3860f337ad53Marc Dietrich 83832890b983086136fef8721363a2d3860f337ad53Marc Dietrich return 0; 83932890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 84032890b983086136fef8721363a2d3860f337ad53Marc Dietrich 84132890b983086136fef8721363a2d3860f337ad53Marc Dietrich#else 84232890b983086136fef8721363a2d3860f337ad53Marc Dietrich#define tegra_nvec_suspend NULL 84332890b983086136fef8721363a2d3860f337ad53Marc Dietrich#define tegra_nvec_resume NULL 84432890b983086136fef8721363a2d3860f337ad53Marc Dietrich#endif 84532890b983086136fef8721363a2d3860f337ad53Marc Dietrich 846162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrichstatic struct platform_driver nvec_device_driver = { 847162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .probe = tegra_nvec_probe, 848162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .remove = __devexit_p(tegra_nvec_remove), 84932890b983086136fef8721363a2d3860f337ad53Marc Dietrich .suspend = tegra_nvec_suspend, 850162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .resume = tegra_nvec_resume, 851162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich .driver = { 85232890b983086136fef8721363a2d3860f337ad53Marc Dietrich .name = "nvec", 85332890b983086136fef8721363a2d3860f337ad53Marc Dietrich .owner = THIS_MODULE, 85432890b983086136fef8721363a2d3860f337ad53Marc Dietrich } 85532890b983086136fef8721363a2d3860f337ad53Marc Dietrich}; 85632890b983086136fef8721363a2d3860f337ad53Marc Dietrich 85732890b983086136fef8721363a2d3860f337ad53Marc Dietrichstatic int __init tegra_nvec_init(void) 85832890b983086136fef8721363a2d3860f337ad53Marc Dietrich{ 85932890b983086136fef8721363a2d3860f337ad53Marc Dietrich return platform_driver_register(&nvec_device_driver); 86032890b983086136fef8721363a2d3860f337ad53Marc Dietrich} 86132890b983086136fef8721363a2d3860f337ad53Marc Dietrich 86232890b983086136fef8721363a2d3860f337ad53Marc Dietrichmodule_init(tegra_nvec_init); 863162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc Dietrich 86432890b983086136fef8721363a2d3860f337ad53Marc DietrichMODULE_ALIAS("platform:nvec"); 865162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc DietrichMODULE_DESCRIPTION("NVIDIA compliant embedded controller interface"); 866162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc DietrichMODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>"); 867162c7d8c4be2d599583c42c2a8fe99bed6d87f67Marc DietrichMODULE_LICENSE("GPL"); 868