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 18 static 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 35 static 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 50 int 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 } 65 EXPORT_SYMBOL(pm860x_reg_read); 66 67 int 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 } 79 EXPORT_SYMBOL(pm860x_reg_write); 80 81 int 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 } 93 EXPORT_SYMBOL(pm860x_bulk_read); 94 95 int 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 } 107 EXPORT_SYMBOL(pm860x_bulk_write); 108 109 int 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); 123 out: 124 mutex_unlock(&chip->io_lock); 125 return ret; 126 } 127 EXPORT_SYMBOL(pm860x_set_bits); 128 129 130 static const struct i2c_device_id pm860x_id_table[] = { 131 { "88PM860x", 0 }, 132 {} 133 }; 134 MODULE_DEVICE_TABLE(i2c, pm860x_id_table); 135 136 static 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 } 156 157 static 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 } 196 197 static 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 kfree(chip); 204 return 0; 205 } 206 207 static struct i2c_driver pm860x_driver = { 208 .driver = { 209 .name = "88PM860x", 210 .owner = THIS_MODULE, 211 }, 212 .probe = pm860x_probe, 213 .remove = __devexit_p(pm860x_remove), 214 .id_table = pm860x_id_table, 215 }; 216 217 static int __init pm860x_i2c_init(void) 218 { 219 int ret; 220 ret = i2c_add_driver(&pm860x_driver); 221 if (ret != 0) 222 pr_err("Failed to register 88PM860x I2C driver: %d\n", ret); 223 return ret; 224 } 225 subsys_initcall(pm860x_i2c_init); 226 227 static void __exit pm860x_i2c_exit(void) 228 { 229 i2c_del_driver(&pm860x_driver); 230 } 231 module_exit(pm860x_i2c_exit); 232 233 MODULE_DESCRIPTION("I2C Driver for Marvell 88PM860x"); 234 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 235 MODULE_LICENSE("GPL"); 236