drivers/mfd/tps65910.c

   1 /*
   2  * tps65910.c  --  TI TPS6591x
   3  *
   4  * Copyright 2010 Texas Instruments Inc.
   5  *
   6  * Author: Graeme Gregory <gg@slimlogic.co.uk>
   7  * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
   8  *
   9  *  This program is free software; you can redistribute it and/or modify it
  10  *  under  the terms of the GNU General  Public License as published by the
  11  *  Free Software Foundation;  either version 2 of the License, or (at your
  12  *  option) any later version.
  13  *
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/moduleparam.h>
  18 #include <linux/init.h>
  19 #include <linux/err.h>
  20 #include <linux/slab.h>
  21 #include <linux/i2c.h>
  22 #include <linux/gpio.h>
  23 #include <linux/mfd/core.h>
  24 #include <linux/regmap.h>
  25 #include <linux/mfd/tps65910.h>
  26
  27 static struct mfd_cell tps65910s[] = {
  28         {
  29                 .name = "tps65910-pmic",
  30         },
  31         {
  32                 .name = "tps65910-rtc",
  33         },
  34         {
  35                 .name = "tps65910-power",
  36         },
  37 };
  38
  39
  40 static int tps65910_i2c_read(struct tps65910 *tps65910, u8 reg,
  41                                   int bytes, void *dest)
  42 {
  43         return regmap_bulk_read(tps65910->regmap, reg, dest, bytes);
  44 }
  45
  46 static int tps65910_i2c_write(struct tps65910 *tps65910, u8 reg,
  47                                   int bytes, void *src)
  48 {
  49         return regmap_bulk_write(tps65910->regmap, reg, src, bytes);
  50 }
  51
  52 int tps65910_set_bits(struct tps65910 *tps65910, u8 reg, u8 mask)
  53 {
  54         return regmap_update_bits(tps65910->regmap, reg, mask, mask);
  55 }
  56 EXPORT_SYMBOL_GPL(tps65910_set_bits);
  57
  58 int tps65910_clear_bits(struct tps65910 *tps65910, u8 reg, u8 mask)
  59 {
  60         return regmap_update_bits(tps65910->regmap, reg, mask, 0);
  61 }
  62 EXPORT_SYMBOL_GPL(tps65910_clear_bits);
  63
  64 static bool is_volatile_reg(struct device *dev, unsigned int reg)
  65 {
  66         struct tps65910 *tps65910 = dev_get_drvdata(dev);
  67
  68         /*
  69          * Caching all regulator registers.
  70          * All regualator register address range is same for
  71          * TPS65910 and TPS65911
  72          */
  73         if ((reg >= TPS65910_VIO) && (reg <= TPS65910_VDAC)) {
  74                 /* Check for non-existing register */
  75                 if (tps65910_chip_id(tps65910) == TPS65910)
  76                         if ((reg == TPS65911_VDDCTRL_OP) ||
  77                                 (reg == TPS65911_VDDCTRL_SR))
  78                                 return true;
  79                 return false;
  80         }
  81         return true;
  82 }
  83
  84 static const struct regmap_config tps65910_regmap_config = {
  85         .reg_bits = 8,
  86         .val_bits = 8,
  87         .volatile_reg = is_volatile_reg,
  88         .max_register = TPS65910_MAX_REGISTER,
  89         .num_reg_defaults_raw = TPS65910_MAX_REGISTER,
  90         .cache_type = REGCACHE_RBTREE,
  91 };
  92
  93 static int tps65910_i2c_probe(struct i2c_client *i2c,
  94                             const struct i2c_device_id *id)
  95 {
  96         struct tps65910 *tps65910;
  97         struct tps65910_board *pmic_plat_data;
  98         struct tps65910_platform_data *init_data;
  99         int ret = 0;
 100
 101         pmic_plat_data = dev_get_platdata(&i2c->dev);
 102         if (!pmic_plat_data)
 103                 return -EINVAL;
 104
 105         init_data = kzalloc(sizeof(struct tps65910_platform_data), GFP_KERNEL);
 106         if (init_data == NULL)
 107                 return -ENOMEM;
 108
 109         tps65910 = kzalloc(sizeof(struct tps65910), GFP_KERNEL);
 110         if (tps65910 == NULL) {
 111                 kfree(init_data);
 112                 return -ENOMEM;
 113         }
 114
 115         i2c_set_clientdata(i2c, tps65910);
 116         tps65910->dev = &i2c->dev;
 117         tps65910->i2c_client = i2c;
 118         tps65910->id = id->driver_data;
 119         tps65910->read = tps65910_i2c_read;
 120         tps65910->write = tps65910_i2c_write;
 121         mutex_init(&tps65910->io_mutex);
 122
 123         tps65910->regmap = regmap_init_i2c(i2c, &tps65910_regmap_config);
 124         if (IS_ERR(tps65910->regmap)) {
 125                 ret = PTR_ERR(tps65910->regmap);
 126                 dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret);
 127                 goto regmap_err;
 128         }
 129
 130         ret = mfd_add_devices(tps65910->dev, -1,
 131                               tps65910s, ARRAY_SIZE(tps65910s),
 132                               NULL, 0);
 133         if (ret < 0)
 134                 goto err;
 135
 136         init_data->irq = pmic_plat_data->irq;
 137         init_data->irq_base = pmic_plat_data->irq_base;
 138
 139         tps65910_gpio_init(tps65910, pmic_plat_data->gpio_base);
 140
 141         tps65910_irq_init(tps65910, init_data->irq, init_data);
 142
 143         kfree(init_data);
 144         return ret;
 145
 146 err:
 147         regmap_exit(tps65910->regmap);
 148 regmap_err:
 149         kfree(tps65910);
 150         kfree(init_data);
 151         return ret;
 152 }
 153
 154 static int tps65910_i2c_remove(struct i2c_client *i2c)
 155 {
 156         struct tps65910 *tps65910 = i2c_get_clientdata(i2c);
 157
 158         tps65910_irq_exit(tps65910);
 159         mfd_remove_devices(tps65910->dev);
 160         regmap_exit(tps65910->regmap);
 161         kfree(tps65910);
 162
 163         return 0;
 164 }
 165
 166 static const struct i2c_device_id tps65910_i2c_id[] = {
 167        { "tps65910", TPS65910 },
 168        { "tps65911", TPS65911 },
 169        { }
 170 };
 171 MODULE_DEVICE_TABLE(i2c, tps65910_i2c_id);
 172
 173
 174 static struct i2c_driver tps65910_i2c_driver = {
 175         .driver = {
 176                    .name = "tps65910",
 177                    .owner = THIS_MODULE,
 178         },
 179         .probe = tps65910_i2c_probe,
 180         .remove = tps65910_i2c_remove,
 181         .id_table = tps65910_i2c_id,
 182 };
 183
 184 static int __init tps65910_i2c_init(void)
 185 {
 186         return i2c_add_driver(&tps65910_i2c_driver);
 187 }
 188 /* init early so consumer devices can complete system boot */
 189 subsys_initcall(tps65910_i2c_init);
 190
 191 static void __exit tps65910_i2c_exit(void)
 192 {
 193         i2c_del_driver(&tps65910_i2c_driver);
 194 }
 195 module_exit(tps65910_i2c_exit);
 196
 197 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
 198 MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>");
 199 MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
 200 MODULE_LICENSE("GPL");