88pm860x-i2c.c revision 5bdf7411bc2329cfe015ba6dcf59531e0c6891b8
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 129static int read_device(struct i2c_client *i2c, int reg, 130 int bytes, void *dest) 131{ 132 unsigned char msgbuf0[I2C_SMBUS_BLOCK_MAX + 3]; 133 unsigned char msgbuf1[I2C_SMBUS_BLOCK_MAX + 2]; 134 struct i2c_adapter *adap = i2c->adapter; 135 struct i2c_msg msg[2] = {{i2c->addr, 0, 1, msgbuf0}, 136 {i2c->addr, I2C_M_RD, 0, msgbuf1}, 137 }; 138 int num = 1, ret = 0; 139 140 if (dest == NULL) 141 return -EINVAL; 142 msgbuf0[0] = (unsigned char)reg; /* command */ 143 msg[1].len = bytes; 144 145 /* if data needs to read back, num should be 2 */ 146 if (bytes > 0) 147 num = 2; 148 ret = adap->algo->master_xfer(adap, msg, num); 149 memcpy(dest, msgbuf1, bytes); 150 if (ret < 0) 151 return ret; 152 return 0; 153} 154 155static int write_device(struct i2c_client *i2c, int reg, 156 int bytes, void *src) 157{ 158 unsigned char buf[bytes + 1]; 159 struct i2c_adapter *adap = i2c->adapter; 160 struct i2c_msg msg; 161 int ret; 162 163 buf[0] = (unsigned char)reg; 164 memcpy(&buf[1], src, bytes); 165 msg.addr = i2c->addr; 166 msg.flags = 0; 167 msg.len = bytes + 1; 168 msg.buf = buf; 169 170 ret = adap->algo->master_xfer(adap, &msg, 1); 171 if (ret < 0) 172 return ret; 173 return 0; 174} 175 176int pm860x_page_reg_read(struct i2c_client *i2c, int reg) 177{ 178 unsigned char zero = 0; 179 unsigned char data; 180 int ret; 181 182 i2c_lock_adapter(i2c->adapter); 183 read_device(i2c, 0xFA, 0, &zero); 184 read_device(i2c, 0xFB, 0, &zero); 185 read_device(i2c, 0xFF, 0, &zero); 186 ret = read_device(i2c, reg, 1, &data); 187 if (ret >= 0) 188 ret = (int)data; 189 read_device(i2c, 0xFE, 0, &zero); 190 read_device(i2c, 0xFC, 0, &zero); 191 i2c_unlock_adapter(i2c->adapter); 192 return ret; 193} 194EXPORT_SYMBOL(pm860x_page_reg_read); 195 196int pm860x_page_reg_write(struct i2c_client *i2c, int reg, 197 unsigned char data) 198{ 199 unsigned char zero; 200 int ret; 201 202 i2c_lock_adapter(i2c->adapter); 203 read_device(i2c, 0xFA, 0, &zero); 204 read_device(i2c, 0xFB, 0, &zero); 205 read_device(i2c, 0xFF, 0, &zero); 206 ret = write_device(i2c, reg, 1, &data); 207 read_device(i2c, 0xFE, 0, &zero); 208 read_device(i2c, 0xFC, 0, &zero); 209 i2c_unlock_adapter(i2c->adapter); 210 return ret; 211} 212EXPORT_SYMBOL(pm860x_page_reg_write); 213 214int pm860x_page_bulk_read(struct i2c_client *i2c, int reg, 215 int count, unsigned char *buf) 216{ 217 unsigned char zero = 0; 218 int ret; 219 220 i2c_lock_adapter(i2c->adapter); 221 read_device(i2c, 0xfa, 0, &zero); 222 read_device(i2c, 0xfb, 0, &zero); 223 read_device(i2c, 0xff, 0, &zero); 224 ret = read_device(i2c, reg, count, buf); 225 read_device(i2c, 0xFE, 0, &zero); 226 read_device(i2c, 0xFC, 0, &zero); 227 i2c_unlock_adapter(i2c->adapter); 228 return ret; 229} 230EXPORT_SYMBOL(pm860x_page_bulk_read); 231 232int pm860x_page_bulk_write(struct i2c_client *i2c, int reg, 233 int count, unsigned char *buf) 234{ 235 unsigned char zero = 0; 236 int ret; 237 238 i2c_lock_adapter(i2c->adapter); 239 read_device(i2c, 0xFA, 0, &zero); 240 read_device(i2c, 0xFB, 0, &zero); 241 read_device(i2c, 0xFF, 0, &zero); 242 ret = write_device(i2c, reg, count, buf); 243 read_device(i2c, 0xFE, 0, &zero); 244 read_device(i2c, 0xFC, 0, &zero); 245 i2c_unlock_adapter(i2c->adapter); 246 i2c_unlock_adapter(i2c->adapter); 247 return ret; 248} 249EXPORT_SYMBOL(pm860x_page_bulk_write); 250 251int pm860x_page_set_bits(struct i2c_client *i2c, int reg, 252 unsigned char mask, unsigned char data) 253{ 254 unsigned char zero; 255 unsigned char value; 256 int ret; 257 258 i2c_lock_adapter(i2c->adapter); 259 read_device(i2c, 0xFA, 0, &zero); 260 read_device(i2c, 0xFB, 0, &zero); 261 read_device(i2c, 0xFF, 0, &zero); 262 ret = read_device(i2c, reg, 1, &value); 263 if (ret < 0) 264 goto out; 265 value &= ~mask; 266 value |= data; 267 ret = write_device(i2c, reg, 1, &value); 268out: 269 read_device(i2c, 0xFE, 0, &zero); 270 read_device(i2c, 0xFC, 0, &zero); 271 i2c_unlock_adapter(i2c->adapter); 272 return ret; 273} 274EXPORT_SYMBOL(pm860x_page_set_bits); 275 276static const struct i2c_device_id pm860x_id_table[] = { 277 { "88PM860x", 0 }, 278 {} 279}; 280MODULE_DEVICE_TABLE(i2c, pm860x_id_table); 281 282static int verify_addr(struct i2c_client *i2c) 283{ 284 unsigned short addr_8607[] = {0x30, 0x34}; 285 unsigned short addr_8606[] = {0x10, 0x11}; 286 int size, i; 287 288 if (i2c == NULL) 289 return 0; 290 size = ARRAY_SIZE(addr_8606); 291 for (i = 0; i < size; i++) { 292 if (i2c->addr == *(addr_8606 + i)) 293 return CHIP_PM8606; 294 } 295 size = ARRAY_SIZE(addr_8607); 296 for (i = 0; i < size; i++) { 297 if (i2c->addr == *(addr_8607 + i)) 298 return CHIP_PM8607; 299 } 300 return 0; 301} 302 303static int __devinit pm860x_probe(struct i2c_client *client, 304 const struct i2c_device_id *id) 305{ 306 struct pm860x_platform_data *pdata = client->dev.platform_data; 307 struct pm860x_chip *chip; 308 309 if (!pdata) { 310 pr_info("No platform data in %s!\n", __func__); 311 return -EINVAL; 312 } 313 314 chip = kzalloc(sizeof(struct pm860x_chip), GFP_KERNEL); 315 if (chip == NULL) 316 return -ENOMEM; 317 318 chip->id = verify_addr(client); 319 chip->client = client; 320 i2c_set_clientdata(client, chip); 321 chip->dev = &client->dev; 322 mutex_init(&chip->io_lock); 323 dev_set_drvdata(chip->dev, chip); 324 325 /* 326 * Both client and companion client shares same platform driver. 327 * Driver distinguishes them by pdata->companion_addr. 328 * pdata->companion_addr is only assigned if companion chip exists. 329 * At the same time, the companion_addr shouldn't equal to client 330 * address. 331 */ 332 if (pdata->companion_addr && (pdata->companion_addr != client->addr)) { 333 chip->companion_addr = pdata->companion_addr; 334 chip->companion = i2c_new_dummy(chip->client->adapter, 335 chip->companion_addr); 336 i2c_set_clientdata(chip->companion, chip); 337 } 338 339 pm860x_device_init(chip, pdata); 340 return 0; 341} 342 343static int __devexit pm860x_remove(struct i2c_client *client) 344{ 345 struct pm860x_chip *chip = i2c_get_clientdata(client); 346 347 pm860x_device_exit(chip); 348 i2c_unregister_device(chip->companion); 349 kfree(chip); 350 return 0; 351} 352 353static struct i2c_driver pm860x_driver = { 354 .driver = { 355 .name = "88PM860x", 356 .owner = THIS_MODULE, 357 }, 358 .probe = pm860x_probe, 359 .remove = __devexit_p(pm860x_remove), 360 .id_table = pm860x_id_table, 361}; 362 363static int __init pm860x_i2c_init(void) 364{ 365 int ret; 366 ret = i2c_add_driver(&pm860x_driver); 367 if (ret != 0) 368 pr_err("Failed to register 88PM860x I2C driver: %d\n", ret); 369 return ret; 370} 371subsys_initcall(pm860x_i2c_init); 372 373static void __exit pm860x_i2c_exit(void) 374{ 375 i2c_del_driver(&pm860x_driver); 376} 377module_exit(pm860x_i2c_exit); 378 379MODULE_DESCRIPTION("I2C Driver for Marvell 88PM860x"); 380MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 381MODULE_LICENSE("GPL"); 382