88pm860x-i2c.c revision 28ade0f217a3a3ff992b01e06e6e425c250a8406
1/* 2 * I2C driver for Marvell 88PM860x 3 * 4 * Copyright (C) 2009 Marvell International Ltd. 5 * Haojian Zhuang <haojian.zhuang@marvell.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11#include <linux/kernel.h> 12#include <linux/module.h> 13#include <linux/platform_device.h> 14#include <linux/i2c.h> 15#include <linux/mfd/88pm860x.h> 16#include <linux/slab.h> 17 18static inline int pm860x_read_device(struct i2c_client *i2c, 19 int reg, int bytes, void *dest) 20{ 21 unsigned char data; 22 int ret; 23 24 data = (unsigned char)reg; 25 ret = i2c_master_send(i2c, &data, 1); 26 if (ret < 0) 27 return ret; 28 29 ret = i2c_master_recv(i2c, dest, bytes); 30 if (ret < 0) 31 return ret; 32 return 0; 33} 34 35static inline int pm860x_write_device(struct i2c_client *i2c, 36 int reg, int bytes, void *src) 37{ 38 unsigned char buf[bytes + 1]; 39 int ret; 40 41 buf[0] = (unsigned char)reg; 42 memcpy(&buf[1], src, bytes); 43 44 ret = i2c_master_send(i2c, buf, bytes + 1); 45 if (ret < 0) 46 return ret; 47 return 0; 48} 49 50int pm860x_reg_read(struct i2c_client *i2c, int reg) 51{ 52 struct pm860x_chip *chip = i2c_get_clientdata(i2c); 53 unsigned char data; 54 int ret; 55 56 mutex_lock(&chip->io_lock); 57 ret = pm860x_read_device(i2c, reg, 1, &data); 58 mutex_unlock(&chip->io_lock); 59 60 if (ret < 0) 61 return ret; 62 else 63 return (int)data; 64} 65EXPORT_SYMBOL(pm860x_reg_read); 66 67int pm860x_reg_write(struct i2c_client *i2c, int reg, 68 unsigned char data) 69{ 70 struct pm860x_chip *chip = i2c_get_clientdata(i2c); 71 int ret; 72 73 mutex_lock(&chip->io_lock); 74 ret = pm860x_write_device(i2c, reg, 1, &data); 75 mutex_unlock(&chip->io_lock); 76 77 return ret; 78} 79EXPORT_SYMBOL(pm860x_reg_write); 80 81int pm860x_bulk_read(struct i2c_client *i2c, int reg, 82 int count, unsigned char *buf) 83{ 84 struct pm860x_chip *chip = i2c_get_clientdata(i2c); 85 int ret; 86 87 mutex_lock(&chip->io_lock); 88 ret = pm860x_read_device(i2c, reg, count, buf); 89 mutex_unlock(&chip->io_lock); 90 91 return ret; 92} 93EXPORT_SYMBOL(pm860x_bulk_read); 94 95int pm860x_bulk_write(struct i2c_client *i2c, int reg, 96 int count, unsigned char *buf) 97{ 98 struct pm860x_chip *chip = i2c_get_clientdata(i2c); 99 int ret; 100 101 mutex_lock(&chip->io_lock); 102 ret = pm860x_write_device(i2c, reg, count, buf); 103 mutex_unlock(&chip->io_lock); 104 105 return ret; 106} 107EXPORT_SYMBOL(pm860x_bulk_write); 108 109int pm860x_set_bits(struct i2c_client *i2c, int reg, 110 unsigned char mask, unsigned char data) 111{ 112 struct pm860x_chip *chip = i2c_get_clientdata(i2c); 113 unsigned char value; 114 int ret; 115 116 mutex_lock(&chip->io_lock); 117 ret = pm860x_read_device(i2c, reg, 1, &value); 118 if (ret < 0) 119 goto out; 120 value &= ~mask; 121 value |= data; 122 ret = pm860x_write_device(i2c, reg, 1, &value); 123out: 124 mutex_unlock(&chip->io_lock); 125 return ret; 126} 127EXPORT_SYMBOL(pm860x_set_bits); 128 129 130static const struct i2c_device_id pm860x_id_table[] = { 131 { "88PM860x", 0 }, 132 {} 133}; 134MODULE_DEVICE_TABLE(i2c, pm860x_id_table); 135 136static int verify_addr(struct i2c_client *i2c) 137{ 138 unsigned short addr_8607[] = {0x30, 0x34}; 139 unsigned short addr_8606[] = {0x10, 0x11}; 140 int size, i; 141 142 if (i2c == NULL) 143 return 0; 144 size = ARRAY_SIZE(addr_8606); 145 for (i = 0; i < size; i++) { 146 if (i2c->addr == *(addr_8606 + i)) 147 return CHIP_PM8606; 148 } 149 size = ARRAY_SIZE(addr_8607); 150 for (i = 0; i < size; i++) { 151 if (i2c->addr == *(addr_8607 + i)) 152 return CHIP_PM8607; 153 } 154 return 0; 155} 156 157static int __devinit pm860x_probe(struct i2c_client *client, 158 const struct i2c_device_id *id) 159{ 160 struct pm860x_platform_data *pdata = client->dev.platform_data; 161 struct pm860x_chip *chip; 162 163 if (!pdata) { 164 pr_info("No platform data in %s!\n", __func__); 165 return -EINVAL; 166 } 167 168 chip = kzalloc(sizeof(struct pm860x_chip), GFP_KERNEL); 169 if (chip == NULL) 170 return -ENOMEM; 171 172 chip->id = verify_addr(client); 173 chip->client = client; 174 i2c_set_clientdata(client, chip); 175 chip->dev = &client->dev; 176 mutex_init(&chip->io_lock); 177 dev_set_drvdata(chip->dev, chip); 178 179 /* 180 * Both client and companion client shares same platform driver. 181 * Driver distinguishes them by pdata->companion_addr. 182 * pdata->companion_addr is only assigned if companion chip exists. 183 * At the same time, the companion_addr shouldn't equal to client 184 * address. 185 */ 186 if (pdata->companion_addr && (pdata->companion_addr != client->addr)) { 187 chip->companion_addr = pdata->companion_addr; 188 chip->companion = i2c_new_dummy(chip->client->adapter, 189 chip->companion_addr); 190 i2c_set_clientdata(chip->companion, chip); 191 } 192 193 pm860x_device_init(chip, pdata); 194 return 0; 195} 196 197static int __devexit pm860x_remove(struct i2c_client *client) 198{ 199 struct pm860x_chip *chip = i2c_get_clientdata(client); 200 201 pm860x_device_exit(chip); 202 i2c_unregister_device(chip->companion); 203 i2c_set_clientdata(chip->client, NULL); 204 i2c_set_clientdata(client, NULL); 205 kfree(chip); 206 return 0; 207} 208 209static struct i2c_driver pm860x_driver = { 210 .driver = { 211 .name = "88PM860x", 212 .owner = THIS_MODULE, 213 }, 214 .probe = pm860x_probe, 215 .remove = __devexit_p(pm860x_remove), 216 .id_table = pm860x_id_table, 217}; 218 219static int __init pm860x_i2c_init(void) 220{ 221 int ret; 222 ret = i2c_add_driver(&pm860x_driver); 223 if (ret != 0) 224 pr_err("Failed to register 88PM860x I2C driver: %d\n", ret); 225 return ret; 226} 227subsys_initcall(pm860x_i2c_init); 228 229static void __exit pm860x_i2c_exit(void) 230{ 231 i2c_del_driver(&pm860x_driver); 232} 233module_exit(pm860x_i2c_exit); 234 235MODULE_DESCRIPTION("I2C Driver for Marvell 88PM860x"); 236MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 237MODULE_LICENSE("GPL"); 238