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/mfd/core.h>
  23 #include <linux/regmap.h>
  24 #include <linux/mfd/tps65910.h>
  25 #include <linux/of_device.h>
  26
  27 static struct mfd_cell tps65910s[] = {
  28         {
  29                 .name = "tps65910-gpio",
  30         },
  31         {
  32                 .name = "tps65910-pmic",
  33         },
  34         {
  35                 .name = "tps65910-rtc",
  36         },
  37         {
  38                 .name = "tps65910-power",
  39         },
  40 };
  41
  42
  43 static bool is_volatile_reg(struct device *dev, unsigned int reg)
  44 {
  45         struct tps65910 *tps65910 = dev_get_drvdata(dev);
  46
  47         /*
  48          * Caching all regulator registers.
  49          * All regualator register address range is same for
  50          * TPS65910 and TPS65911
  51          */
  52         if ((reg >= TPS65910_VIO) && (reg <= TPS65910_VDAC)) {
  53                 /* Check for non-existing register */
  54                 if (tps65910_chip_id(tps65910) == TPS65910)
  55                         if ((reg == TPS65911_VDDCTRL_OP) ||
  56                                 (reg == TPS65911_VDDCTRL_SR))
  57                                 return true;
  58                 return false;
  59         }
  60         return true;
  61 }
  62
  63 static const struct regmap_config tps65910_regmap_config = {
  64         .reg_bits = 8,
  65         .val_bits = 8,
  66         .volatile_reg = is_volatile_reg,
  67         .max_register = TPS65910_MAX_REGISTER - 1,
  68         .cache_type = REGCACHE_RBTREE,
  69 };
  70
  71 static int __devinit tps65910_sleepinit(struct tps65910 *tps65910,
  72                 struct tps65910_board *pmic_pdata)
  73 {
  74         struct device *dev = NULL;
  75         int ret = 0;
  76
  77         dev = tps65910->dev;
  78
  79         if (!pmic_pdata->en_dev_slp)
  80                 return 0;
  81
  82         /* enabling SLEEP device state */
  83         ret = tps65910_reg_set_bits(tps65910, TPS65910_DEVCTRL,
  84                                 DEVCTRL_DEV_SLP_MASK);
  85         if (ret < 0) {
  86                 dev_err(dev, "set dev_slp failed: %d\n", ret);
  87                 goto err_sleep_init;
  88         }
  89
  90         /* Return if there is no sleep keepon data. */
  91         if (!pmic_pdata->slp_keepon)
  92                 return 0;
  93
  94         if (pmic_pdata->slp_keepon->therm_keepon) {
  95                 ret = tps65910_reg_set_bits(tps65910,
  96                                 TPS65910_SLEEP_KEEP_RES_ON,
  97                                 SLEEP_KEEP_RES_ON_THERM_KEEPON_MASK);
  98                 if (ret < 0) {
  99                         dev_err(dev, "set therm_keepon failed: %d\n", ret);
 100                         goto disable_dev_slp;
 101                 }
 102         }
 103
 104         if (pmic_pdata->slp_keepon->clkout32k_keepon) {
 105                 ret = tps65910_reg_set_bits(tps65910,
 106                                 TPS65910_SLEEP_KEEP_RES_ON,
 107                                 SLEEP_KEEP_RES_ON_CLKOUT32K_KEEPON_MASK);
 108                 if (ret < 0) {
 109                         dev_err(dev, "set clkout32k_keepon failed: %d\n", ret);
 110                         goto disable_dev_slp;
 111                 }
 112         }
 113
 114         if (pmic_pdata->slp_keepon->i2chs_keepon) {
 115                 ret = tps65910_reg_set_bits(tps65910,
 116                                 TPS65910_SLEEP_KEEP_RES_ON,
 117                                 SLEEP_KEEP_RES_ON_I2CHS_KEEPON_MASK);
 118                 if (ret < 0) {
 119                         dev_err(dev, "set i2chs_keepon failed: %d\n", ret);
 120                         goto disable_dev_slp;
 121                 }
 122         }
 123
 124         return 0;
 125
 126 disable_dev_slp:
 127         tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
 128                                 DEVCTRL_DEV_SLP_MASK);
 129
 130 err_sleep_init:
 131         return ret;
 132 }
 133
 134 #ifdef CONFIG_OF
 135 static struct of_device_id tps65910_of_match[] = {
 136         { .compatible = "ti,tps65910", .data = (void *)TPS65910},
 137         { .compatible = "ti,tps65911", .data = (void *)TPS65911},
 138         { },
 139 };
 140 MODULE_DEVICE_TABLE(of, tps65910_of_match);
 141
 142 static struct tps65910_board *tps65910_parse_dt(struct i2c_client *client,
 143                                                 int *chip_id)
 144 {
 145         struct device_node *np = client->dev.of_node;
 146         struct tps65910_board *board_info;
 147         unsigned int prop;
 148         const struct of_device_id *match;
 149         int ret = 0;
 150
 151         match = of_match_device(tps65910_of_match, &client->dev);
 152         if (!match) {
 153                 dev_err(&client->dev, "Failed to find matching dt id\n");
 154                 return NULL;
 155         }
 156
 157         *chip_id  = (int)match->data;
 158
 159         board_info = devm_kzalloc(&client->dev, sizeof(*board_info),
 160                         GFP_KERNEL);
 161         if (!board_info) {
 162                 dev_err(&client->dev, "Failed to allocate pdata\n");
 163                 return NULL;
 164         }
 165
 166         ret = of_property_read_u32(np, "ti,vmbch-threshold", &prop);
 167         if (!ret)
 168                 board_info->vmbch_threshold = prop;
 169         else if (*chip_id == TPS65911)
 170                 dev_warn(&client->dev, "VMBCH-Threshold not specified");
 171
 172         ret = of_property_read_u32(np, "ti,vmbch2-threshold", &prop);
 173         if (!ret)
 174                 board_info->vmbch2_threshold = prop;
 175         else if (*chip_id == TPS65911)
 176                 dev_warn(&client->dev, "VMBCH2-Threshold not specified");
 177
 178         board_info->irq = client->irq;
 179         board_info->irq_base = -1;
 180
 181         return board_info;
 182 }
 183 #else
 184 static inline
 185 struct tps65910_board *tps65910_parse_dt(struct i2c_client *client,
 186                                          int *chip_id)
 187 {
 188         return NULL;
 189 }
 190 #endif
 191
 192 static __devinit int tps65910_i2c_probe(struct i2c_client *i2c,
 193                                         const struct i2c_device_id *id)
 194 {
 195         struct tps65910 *tps65910;
 196         struct tps65910_board *pmic_plat_data;
 197         struct tps65910_board *of_pmic_plat_data = NULL;
 198         struct tps65910_platform_data *init_data;
 199         int ret = 0;
 200         int chip_id = id->driver_data;
 201
 202         pmic_plat_data = dev_get_platdata(&i2c->dev);
 203
 204         if (!pmic_plat_data && i2c->dev.of_node) {
 205                 pmic_plat_data = tps65910_parse_dt(i2c, &chip_id);
 206                 of_pmic_plat_data = pmic_plat_data;
 207         }
 208
 209         if (!pmic_plat_data)
 210                 return -EINVAL;
 211
 212         init_data = devm_kzalloc(&i2c->dev, sizeof(*init_data), GFP_KERNEL);
 213         if (init_data == NULL)
 214                 return -ENOMEM;
 215
 216         tps65910 = devm_kzalloc(&i2c->dev, sizeof(*tps65910), GFP_KERNEL);
 217         if (tps65910 == NULL)
 218                 return -ENOMEM;
 219
 220         tps65910->of_plat_data = of_pmic_plat_data;
 221         i2c_set_clientdata(i2c, tps65910);
 222         tps65910->dev = &i2c->dev;
 223         tps65910->i2c_client = i2c;
 224         tps65910->id = chip_id;
 225         mutex_init(&tps65910->io_mutex);
 226
 227         tps65910->regmap = devm_regmap_init_i2c(i2c, &tps65910_regmap_config);
 228         if (IS_ERR(tps65910->regmap)) {
 229                 ret = PTR_ERR(tps65910->regmap);
 230                 dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret);
 231                 return ret;
 232         }
 233
 234         ret = mfd_add_devices(tps65910->dev, -1,
 235                               tps65910s, ARRAY_SIZE(tps65910s),
 236                               NULL, 0);
 237         if (ret < 0) {
 238                 dev_err(&i2c->dev, "mfd_add_devices failed: %d\n", ret);
 239                 return ret;
 240         }
 241
 242         init_data->irq = pmic_plat_data->irq;
 243         init_data->irq_base = pmic_plat_data->irq_base;
 244
 245         tps65910_irq_init(tps65910, init_data->irq, init_data);
 246
 247         tps65910_sleepinit(tps65910, pmic_plat_data);
 248
 249         return ret;
 250 }
 251
 252 static __devexit int tps65910_i2c_remove(struct i2c_client *i2c)
 253 {
 254         struct tps65910 *tps65910 = i2c_get_clientdata(i2c);
 255
 256         tps65910_irq_exit(tps65910);
 257         mfd_remove_devices(tps65910->dev);
 258
 259         return 0;
 260 }
 261
 262 static const struct i2c_device_id tps65910_i2c_id[] = {
 263        { "tps65910", TPS65910 },
 264        { "tps65911", TPS65911 },
 265        { }
 266 };
 267 MODULE_DEVICE_TABLE(i2c, tps65910_i2c_id);
 268
 269
 270 static struct i2c_driver tps65910_i2c_driver = {
 271         .driver = {
 272                    .name = "tps65910",
 273                    .owner = THIS_MODULE,
 274                    .of_match_table = of_match_ptr(tps65910_of_match),
 275         },
 276         .probe = tps65910_i2c_probe,
 277         .remove = __devexit_p(tps65910_i2c_remove),
 278         .id_table = tps65910_i2c_id,
 279 };
 280
 281 static int __init tps65910_i2c_init(void)
 282 {
 283         return i2c_add_driver(&tps65910_i2c_driver);
 284 }
 285 /* init early so consumer devices can complete system boot */
 286 subsys_initcall(tps65910_i2c_init);
 287
 288 static void __exit tps65910_i2c_exit(void)
 289 {
 290         i2c_del_driver(&tps65910_i2c_driver);
 291 }
 292 module_exit(tps65910_i2c_exit);
 293
 294 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
 295 MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>");
 296 MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
 297 MODULE_LICENSE("GPL");