drivers/mfd/88pm8607.c

   1 /*
   2  * Base driver for Marvell 88PM8607
   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
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/i2c.h>
  17 #include <linux/mfd/core.h>
  18 #include <linux/mfd/88pm8607.h>
  19
  20
  21 #define PM8607_REG_RESOURCE(_start, _end)               \
  22 {                                                       \
  23         .start  = PM8607_##_start,                      \
  24         .end    = PM8607_##_end,                        \
  25         .flags  = IORESOURCE_IO,                        \
  26 }
  27
  28 static struct resource pm8607_regulator_resources[] = {
  29         PM8607_REG_RESOURCE(BUCK1, BUCK1),
  30         PM8607_REG_RESOURCE(BUCK2, BUCK2),
  31         PM8607_REG_RESOURCE(BUCK3, BUCK3),
  32         PM8607_REG_RESOURCE(LDO1,  LDO1),
  33         PM8607_REG_RESOURCE(LDO2,  LDO2),
  34         PM8607_REG_RESOURCE(LDO3,  LDO3),
  35         PM8607_REG_RESOURCE(LDO4,  LDO4),
  36         PM8607_REG_RESOURCE(LDO5,  LDO5),
  37         PM8607_REG_RESOURCE(LDO6,  LDO6),
  38         PM8607_REG_RESOURCE(LDO7,  LDO7),
  39         PM8607_REG_RESOURCE(LDO8,  LDO8),
  40         PM8607_REG_RESOURCE(LDO9,  LDO9),
  41         PM8607_REG_RESOURCE(LDO10, LDO10),
  42         PM8607_REG_RESOURCE(LDO12, LDO12),
  43         PM8607_REG_RESOURCE(LDO14, LDO14),
  44 };
  45
  46 #define PM8607_REG_DEVS(_name, _id)                                     \
  47 {                                                                       \
  48         .name           = "88pm8607-" #_name,                           \
  49         .num_resources  = 1,                                            \
  50         .resources      = &pm8607_regulator_resources[PM8607_ID_##_id], \
  51 }
  52
  53 static struct mfd_cell pm8607_devs[] = {
  54         PM8607_REG_DEVS(buck1, BUCK1),
  55         PM8607_REG_DEVS(buck2, BUCK2),
  56         PM8607_REG_DEVS(buck3, BUCK3),
  57         PM8607_REG_DEVS(ldo1,  LDO1),
  58         PM8607_REG_DEVS(ldo2,  LDO2),
  59         PM8607_REG_DEVS(ldo3,  LDO3),
  60         PM8607_REG_DEVS(ldo4,  LDO4),
  61         PM8607_REG_DEVS(ldo5,  LDO5),
  62         PM8607_REG_DEVS(ldo6,  LDO6),
  63         PM8607_REG_DEVS(ldo7,  LDO7),
  64         PM8607_REG_DEVS(ldo8,  LDO8),
  65         PM8607_REG_DEVS(ldo9,  LDO9),
  66         PM8607_REG_DEVS(ldo10, LDO10),
  67         PM8607_REG_DEVS(ldo12, LDO12),
  68         PM8607_REG_DEVS(ldo14, LDO14),
  69 };
  70
  71 static inline int pm8607_read_device(struct pm8607_chip *chip,
  72                                      int reg, int bytes, void *dest)
  73 {
  74         struct i2c_client *i2c = chip->client;
  75         unsigned char data;
  76         int ret;
  77
  78         data = (unsigned char)reg;
  79         ret = i2c_master_send(i2c, &data, 1);
  80         if (ret < 0)
  81                 return ret;
  82
  83         ret = i2c_master_recv(i2c, dest, bytes);
  84         if (ret < 0)
  85                 return ret;
  86         return 0;
  87 }
  88
  89 static inline int pm8607_write_device(struct pm8607_chip *chip,
  90                                       int reg, int bytes, void *src)
  91 {
  92         struct i2c_client *i2c = chip->client;
  93         unsigned char buf[bytes + 1];
  94         int ret;
  95
  96         buf[0] = (unsigned char)reg;
  97         memcpy(&buf[1], src, bytes);
  98
  99         ret = i2c_master_send(i2c, buf, bytes + 1);
 100         if (ret < 0)
 101                 return ret;
 102         return 0;
 103 }
 104
 105 int pm8607_reg_read(struct pm8607_chip *chip, int reg)
 106 {
 107         unsigned char data;
 108         int ret;
 109
 110         mutex_lock(&chip->io_lock);
 111         ret = chip->read(chip, reg, 1, &data);
 112         mutex_unlock(&chip->io_lock);
 113
 114         if (ret < 0)
 115                 return ret;
 116         else
 117                 return (int)data;
 118 }
 119 EXPORT_SYMBOL(pm8607_reg_read);
 120
 121 int pm8607_reg_write(struct pm8607_chip *chip, int reg,
 122                      unsigned char data)
 123 {
 124         int ret;
 125
 126         mutex_lock(&chip->io_lock);
 127         ret = chip->write(chip, reg, 1, &data);
 128         mutex_unlock(&chip->io_lock);
 129
 130         return ret;
 131 }
 132 EXPORT_SYMBOL(pm8607_reg_write);
 133
 134 int pm8607_bulk_read(struct pm8607_chip *chip, int reg,
 135                      int count, unsigned char *buf)
 136 {
 137         int ret;
 138
 139         mutex_lock(&chip->io_lock);
 140         ret = chip->read(chip, reg, count, buf);
 141         mutex_unlock(&chip->io_lock);
 142
 143         return ret;
 144 }
 145 EXPORT_SYMBOL(pm8607_bulk_read);
 146
 147 int pm8607_bulk_write(struct pm8607_chip *chip, int reg,
 148                       int count, unsigned char *buf)
 149 {
 150         int ret;
 151
 152         mutex_lock(&chip->io_lock);
 153         ret = chip->write(chip, reg, count, buf);
 154         mutex_unlock(&chip->io_lock);
 155
 156         return ret;
 157 }
 158 EXPORT_SYMBOL(pm8607_bulk_write);
 159
 160 int pm8607_set_bits(struct pm8607_chip *chip, int reg,
 161                     unsigned char mask, unsigned char data)
 162 {
 163         unsigned char value;
 164         int ret;
 165
 166         mutex_lock(&chip->io_lock);
 167         ret = chip->read(chip, reg, 1, &value);
 168         if (ret < 0)
 169                 goto out;
 170         value &= ~mask;
 171         value |= data;
 172         ret = chip->write(chip, reg, 1, &value);
 173 out:
 174         mutex_unlock(&chip->io_lock);
 175         return ret;
 176 }
 177 EXPORT_SYMBOL(pm8607_set_bits);
 178
 179
 180 static const struct i2c_device_id pm8607_id_table[] = {
 181         { "88PM8607", 0 },
 182         {}
 183 };
 184 MODULE_DEVICE_TABLE(i2c, pm8607_id_table);
 185
 186
 187 static int __devinit pm8607_probe(struct i2c_client *client,
 188                                   const struct i2c_device_id *id)
 189 {
 190         struct pm8607_platform_data *pdata = client->dev.platform_data;
 191         struct pm8607_chip *chip;
 192         int i, count;
 193         int ret;
 194
 195         chip = kzalloc(sizeof(struct pm8607_chip), GFP_KERNEL);
 196         if (chip == NULL)
 197                 return -ENOMEM;
 198
 199         chip->client = client;
 200         chip->dev = &client->dev;
 201         chip->read = pm8607_read_device;
 202         chip->write = pm8607_write_device;
 203         i2c_set_clientdata(client, chip);
 204
 205         mutex_init(&chip->io_lock);
 206         dev_set_drvdata(chip->dev, chip);
 207
 208         ret = pm8607_reg_read(chip, PM8607_CHIP_ID);
 209         if (ret < 0) {
 210                 dev_err(chip->dev, "Failed to read CHIP ID: %d\n", ret);
 211                 goto out;
 212         }
 213         if ((ret & CHIP_ID_MASK) == CHIP_ID)
 214                 dev_info(chip->dev, "Marvell 88PM8607 (ID: %02x) detected\n",
 215                          ret);
 216         else {
 217                 dev_err(chip->dev, "Failed to detect Marvell 88PM8607. "
 218                         "Chip ID: %02x\n", ret);
 219                 goto out;
 220         }
 221         chip->chip_id = ret;
 222
 223         ret = pm8607_reg_read(chip, PM8607_BUCK3);
 224         if (ret < 0) {
 225                 dev_err(chip->dev, "Failed to read BUCK3 register: %d\n", ret);
 226                 goto out;
 227         }
 228         if (ret & PM8607_BUCK3_DOUBLE)
 229                 chip->buck3_double = 1;
 230
 231         ret = pm8607_reg_read(chip, PM8607_MISC1);
 232         if (ret < 0) {
 233                 dev_err(chip->dev, "Failed to read MISC1 register: %d\n", ret);
 234                 goto out;
 235         }
 236         if (pdata->i2c_port == PI2C_PORT)
 237                 ret |= PM8607_MISC1_PI2C;
 238         else
 239                 ret &= ~PM8607_MISC1_PI2C;
 240         ret = pm8607_reg_write(chip, PM8607_MISC1, ret);
 241         if (ret < 0) {
 242                 dev_err(chip->dev, "Failed to write MISC1 register: %d\n", ret);
 243                 goto out;
 244         }
 245
 246
 247         count = ARRAY_SIZE(pm8607_devs);
 248         for (i = 0; i < count; i++) {
 249                 ret = mfd_add_devices(chip->dev, i, &pm8607_devs[i],
 250                                       1, NULL, 0);
 251                 if (ret != 0) {
 252                         dev_err(chip->dev, "Failed to add subdevs\n");
 253                         goto out;
 254                 }
 255         }
 256
 257         return 0;
 258
 259 out:
 260         i2c_set_clientdata(client, NULL);
 261         kfree(chip);
 262         return ret;
 263 }
 264
 265 static int __devexit pm8607_remove(struct i2c_client *client)
 266 {
 267         struct pm8607_chip *chip = i2c_get_clientdata(client);
 268
 269         mfd_remove_devices(chip->dev);
 270         kfree(chip);
 271         return 0;
 272 }
 273
 274 static struct i2c_driver pm8607_driver = {
 275         .driver = {
 276                 .name   = "88PM8607",
 277                 .owner  = THIS_MODULE,
 278         },
 279         .probe          = pm8607_probe,
 280         .remove         = __devexit_p(pm8607_remove),
 281         .id_table       = pm8607_id_table,
 282 };
 283
 284 static int __init pm8607_init(void)
 285 {
 286         int ret;
 287         ret = i2c_add_driver(&pm8607_driver);
 288         if (ret != 0)
 289                 pr_err("Failed to register 88PM8607 I2C driver: %d\n", ret);
 290         return ret;
 291 }
 292 subsys_initcall(pm8607_init);
 293
 294 static void __exit pm8607_exit(void)
 295 {
 296         i2c_del_driver(&pm8607_driver);
 297 }
 298 module_exit(pm8607_exit);
 299
 300 MODULE_DESCRIPTION("PMIC Driver for Marvell 88PM8607");
 301 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 302 MODULE_LICENSE("GPL");