88pm860x-i2c.c revision 09b034191acd1f95a749630fe366a84d3029930c
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 129int pm860x_page_reg_read(struct i2c_client *i2c, int reg) 130{ 131 struct pm860x_chip *chip = i2c_get_clientdata(i2c); 132 unsigned char zero = 0; 133 unsigned char data; 134 int ret; 135 136 mutex_lock(&chip->io_lock); 137 pm860x_write_device(i2c, 0xFA, 0, &zero); 138 pm860x_write_device(i2c, 0xFB, 0, &zero); 139 pm860x_write_device(i2c, 0xFF, 0, &zero); 140 ret = pm860x_read_device(i2c, reg, 1, &data); 141 if (ret >= 0) 142 ret = (int)data; 143 pm860x_write_device(i2c, 0xFE, 0, &zero); 144 pm860x_write_device(i2c, 0xFC, 0, &zero); 145 mutex_unlock(&chip->io_lock); 146 return ret; 147} 148EXPORT_SYMBOL(pm860x_page_reg_read); 149 150int pm860x_page_reg_write(struct i2c_client *i2c, int reg, 151 unsigned char data) 152{ 153 struct pm860x_chip *chip = i2c_get_clientdata(i2c); 154 unsigned char zero; 155 int ret; 156 157 mutex_lock(&chip->io_lock); 158 pm860x_write_device(i2c, 0xFA, 0, &zero); 159 pm860x_write_device(i2c, 0xFB, 0, &zero); 160 pm860x_write_device(i2c, 0xFF, 0, &zero); 161 ret = pm860x_write_device(i2c, reg, 1, &data); 162 pm860x_write_device(i2c, 0xFE, 0, &zero); 163 pm860x_write_device(i2c, 0xFC, 0, &zero); 164 mutex_unlock(&chip->io_lock); 165 return ret; 166} 167EXPORT_SYMBOL(pm860x_page_reg_write); 168 169int pm860x_page_bulk_read(struct i2c_client *i2c, int reg, 170 int count, unsigned char *buf) 171{ 172 struct pm860x_chip *chip = i2c_get_clientdata(i2c); 173 unsigned char zero = 0; 174 int ret; 175 176 mutex_lock(&chip->io_lock); 177 pm860x_write_device(i2c, 0xFA, 0, &zero); 178 pm860x_write_device(i2c, 0xFB, 0, &zero); 179 pm860x_write_device(i2c, 0xFF, 0, &zero); 180 ret = pm860x_read_device(i2c, reg, count, buf); 181 pm860x_write_device(i2c, 0xFE, 0, &zero); 182 pm860x_write_device(i2c, 0xFC, 0, &zero); 183 mutex_unlock(&chip->io_lock); 184 return ret; 185} 186EXPORT_SYMBOL(pm860x_page_bulk_read); 187 188int pm860x_page_bulk_write(struct i2c_client *i2c, int reg, 189 int count, unsigned char *buf) 190{ 191 struct pm860x_chip *chip = i2c_get_clientdata(i2c); 192 unsigned char zero = 0; 193 int ret; 194 195 mutex_lock(&chip->io_lock); 196 pm860x_write_device(i2c, 0xFA, 0, &zero); 197 pm860x_write_device(i2c, 0xFB, 0, &zero); 198 pm860x_write_device(i2c, 0xFF, 0, &zero); 199 ret = pm860x_write_device(i2c, reg, count, buf); 200 pm860x_write_device(i2c, 0xFE, 0, &zero); 201 pm860x_write_device(i2c, 0xFC, 0, &zero); 202 mutex_unlock(&chip->io_lock); 203 return ret; 204} 205EXPORT_SYMBOL(pm860x_page_bulk_write); 206 207int pm860x_page_set_bits(struct i2c_client *i2c, int reg, 208 unsigned char mask, unsigned char data) 209{ 210 struct pm860x_chip *chip = i2c_get_clientdata(i2c); 211 unsigned char zero; 212 unsigned char value; 213 int ret; 214 215 mutex_lock(&chip->io_lock); 216 pm860x_write_device(i2c, 0xFA, 0, &zero); 217 pm860x_write_device(i2c, 0xFB, 0, &zero); 218 pm860x_write_device(i2c, 0xFF, 0, &zero); 219 ret = pm860x_read_device(i2c, reg, 1, &value); 220 if (ret < 0) 221 goto out; 222 value &= ~mask; 223 value |= data; 224 ret = pm860x_write_device(i2c, reg, 1, &value); 225out: 226 pm860x_write_device(i2c, 0xFE, 0, &zero); 227 pm860x_write_device(i2c, 0xFC, 0, &zero); 228 mutex_unlock(&chip->io_lock); 229 return ret; 230} 231EXPORT_SYMBOL(pm860x_page_set_bits); 232 233static const struct i2c_device_id pm860x_id_table[] = { 234 { "88PM860x", 0 }, 235 {} 236}; 237MODULE_DEVICE_TABLE(i2c, pm860x_id_table); 238 239static int verify_addr(struct i2c_client *i2c) 240{ 241 unsigned short addr_8607[] = {0x30, 0x34}; 242 unsigned short addr_8606[] = {0x10, 0x11}; 243 int size, i; 244 245 if (i2c == NULL) 246 return 0; 247 size = ARRAY_SIZE(addr_8606); 248 for (i = 0; i < size; i++) { 249 if (i2c->addr == *(addr_8606 + i)) 250 return CHIP_PM8606; 251 } 252 size = ARRAY_SIZE(addr_8607); 253 for (i = 0; i < size; i++) { 254 if (i2c->addr == *(addr_8607 + i)) 255 return CHIP_PM8607; 256 } 257 return 0; 258} 259 260static int __devinit pm860x_probe(struct i2c_client *client, 261 const struct i2c_device_id *id) 262{ 263 struct pm860x_platform_data *pdata = client->dev.platform_data; 264 struct pm860x_chip *chip; 265 266 if (!pdata) { 267 pr_info("No platform data in %s!\n", __func__); 268 return -EINVAL; 269 } 270 271 chip = kzalloc(sizeof(struct pm860x_chip), GFP_KERNEL); 272 if (chip == NULL) 273 return -ENOMEM; 274 275 chip->id = verify_addr(client); 276 chip->client = client; 277 i2c_set_clientdata(client, chip); 278 chip->dev = &client->dev; 279 mutex_init(&chip->io_lock); 280 dev_set_drvdata(chip->dev, chip); 281 282 /* 283 * Both client and companion client shares same platform driver. 284 * Driver distinguishes them by pdata->companion_addr. 285 * pdata->companion_addr is only assigned if companion chip exists. 286 * At the same time, the companion_addr shouldn't equal to client 287 * address. 288 */ 289 if (pdata->companion_addr && (pdata->companion_addr != client->addr)) { 290 chip->companion_addr = pdata->companion_addr; 291 chip->companion = i2c_new_dummy(chip->client->adapter, 292 chip->companion_addr); 293 i2c_set_clientdata(chip->companion, chip); 294 } 295 296 pm860x_device_init(chip, pdata); 297 return 0; 298} 299 300static int __devexit pm860x_remove(struct i2c_client *client) 301{ 302 struct pm860x_chip *chip = i2c_get_clientdata(client); 303 304 pm860x_device_exit(chip); 305 i2c_unregister_device(chip->companion); 306 kfree(chip); 307 return 0; 308} 309 310static struct i2c_driver pm860x_driver = { 311 .driver = { 312 .name = "88PM860x", 313 .owner = THIS_MODULE, 314 }, 315 .probe = pm860x_probe, 316 .remove = __devexit_p(pm860x_remove), 317 .id_table = pm860x_id_table, 318}; 319 320static int __init pm860x_i2c_init(void) 321{ 322 int ret; 323 ret = i2c_add_driver(&pm860x_driver); 324 if (ret != 0) 325 pr_err("Failed to register 88PM860x I2C driver: %d\n", ret); 326 return ret; 327} 328subsys_initcall(pm860x_i2c_init); 329 330static void __exit pm860x_i2c_exit(void) 331{ 332 i2c_del_driver(&pm860x_driver); 333} 334module_exit(pm860x_i2c_exit); 335 336MODULE_DESCRIPTION("I2C Driver for Marvell 88PM860x"); 337MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 338MODULE_LICENSE("GPL"); 339