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 resource rtc_resources[] = {
  28         {
  29                 .start  = TPS65910_IRQ_RTC_ALARM,
  30                 .end    = TPS65910_IRQ_RTC_ALARM,
  31                 .flags  = IORESOURCE_IRQ,
  32         }
  33 };
  34
  35 static struct mfd_cell tps65910s[] = {
  36         {
  37                 .name = "tps65910-gpio",
  38         },
  39         {
  40                 .name = "tps65910-pmic",
  41         },
  42         {
  43                 .name = "tps65910-rtc",
  44                 .num_resources = ARRAY_SIZE(rtc_resources),
  45                 .resources = &rtc_resources[0],
  46         },
  47         {
  48                 .name = "tps65910-power",
  49         },
  50 };
  51
  52
  53 static bool is_volatile_reg(struct device *dev, unsigned int reg)
  54 {
  55         struct tps65910 *tps65910 = dev_get_drvdata(dev);
  56
  57         /*
  58          * Caching all regulator registers.
  59          * All regualator register address range is same for
  60          * TPS65910 and TPS65911
  61          */
  62         if ((reg >= TPS65910_VIO) && (reg <= TPS65910_VDAC)) {
  63                 /* Check for non-existing register */
  64                 if (tps65910_chip_id(tps65910) == TPS65910)
  65                         if ((reg == TPS65911_VDDCTRL_OP) ||
  66                                 (reg == TPS65911_VDDCTRL_SR))
  67                                 return true;
  68                 return false;
  69         }
  70         return true;
  71 }
  72
  73 static const struct regmap_config tps65910_regmap_config = {
  74         .reg_bits = 8,
  75         .val_bits = 8,
  76         .volatile_reg = is_volatile_reg,
  77         .max_register = TPS65910_MAX_REGISTER - 1,
  78         .cache_type = REGCACHE_RBTREE,
  79 };
  80
  81 static int __devinit tps65910_ck32k_init(struct tps65910 *tps65910,
  82                                         struct tps65910_board *pmic_pdata)
  83 {
  84         int ret;
  85
  86         if (!pmic_pdata->en_ck32k_xtal)
  87                 return 0;
  88
  89         ret = tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
  90                                                 DEVCTRL_CK32K_CTRL_MASK);
  91         if (ret < 0) {
  92                 dev_err(tps65910->dev, "clear ck32k_ctrl failed: %d\n", ret);
  93                 return ret;
  94         }
  95
  96         return 0;
  97 }
  98
  99 static int __devinit tps65910_sleepinit(struct tps65910 *tps65910,
 100                 struct tps65910_board *pmic_pdata)
 101 {
 102         struct device *dev = NULL;
 103         int ret = 0;
 104
 105         dev = tps65910->dev;
 106
 107         if (!pmic_pdata->en_dev_slp)
 108                 return 0;
 109
 110         /* enabling SLEEP device state */
 111         ret = tps65910_reg_set_bits(tps65910, TPS65910_DEVCTRL,
 112                                 DEVCTRL_DEV_SLP_MASK);
 113         if (ret < 0) {
 114                 dev_err(dev, "set dev_slp failed: %d\n", ret);
 115                 goto err_sleep_init;
 116         }
 117
 118         /* Return if there is no sleep keepon data. */
 119         if (!pmic_pdata->slp_keepon)
 120                 return 0;
 121
 122         if (pmic_pdata->slp_keepon->therm_keepon) {
 123                 ret = tps65910_reg_set_bits(tps65910,
 124                                 TPS65910_SLEEP_KEEP_RES_ON,
 125                                 SLEEP_KEEP_RES_ON_THERM_KEEPON_MASK);
 126                 if (ret < 0) {
 127                         dev_err(dev, "set therm_keepon failed: %d\n", ret);
 128                         goto disable_dev_slp;
 129                 }
 130         }
 131
 132         if (pmic_pdata->slp_keepon->clkout32k_keepon) {
 133                 ret = tps65910_reg_set_bits(tps65910,
 134                                 TPS65910_SLEEP_KEEP_RES_ON,
 135                                 SLEEP_KEEP_RES_ON_CLKOUT32K_KEEPON_MASK);
 136                 if (ret < 0) {
 137                         dev_err(dev, "set clkout32k_keepon failed: %d\n", ret);
 138                         goto disable_dev_slp;
 139                 }
 140         }
 141
 142         if (pmic_pdata->slp_keepon->i2chs_keepon) {
 143                 ret = tps65910_reg_set_bits(tps65910,
 144                                 TPS65910_SLEEP_KEEP_RES_ON,
 145                                 SLEEP_KEEP_RES_ON_I2CHS_KEEPON_MASK);
 146                 if (ret < 0) {
 147                         dev_err(dev, "set i2chs_keepon failed: %d\n", ret);
 148                         goto disable_dev_slp;
 149                 }
 150         }
 151
 152         return 0;
 153
 154 disable_dev_slp:
 155         tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
 156                                 DEVCTRL_DEV_SLP_MASK);
 157
 158 err_sleep_init:
 159         return ret;
 160 }
 161
 162 #ifdef CONFIG_OF
 163 static struct of_device_id tps65910_of_match[] = {
 164         { .compatible = "ti,tps65910", .data = (void *)TPS65910},
 165         { .compatible = "ti,tps65911", .data = (void *)TPS65911},
 166         { },
 167 };
 168 MODULE_DEVICE_TABLE(of, tps65910_of_match);
 169
 170 static struct tps65910_board *tps65910_parse_dt(struct i2c_client *client,
 171                                                 int *chip_id)
 172 {
 173         struct device_node *np = client->dev.of_node;
 174         struct tps65910_board *board_info;
 175         unsigned int prop;
 176         const struct of_device_id *match;
 177         int ret = 0;
 178
 179         match = of_match_device(tps65910_of_match, &client->dev);
 180         if (!match) {
 181                 dev_err(&client->dev, "Failed to find matching dt id\n");
 182                 return NULL;
 183         }
 184
 185         *chip_id  = (int)match->data;
 186
 187         board_info = devm_kzalloc(&client->dev, sizeof(*board_info),
 188                         GFP_KERNEL);
 189         if (!board_info) {
 190                 dev_err(&client->dev, "Failed to allocate pdata\n");
 191                 return NULL;
 192         }
 193
 194         ret = of_property_read_u32(np, "ti,vmbch-threshold", &prop);
 195         if (!ret)
 196                 board_info->vmbch_threshold = prop;
 197         else if (*chip_id == TPS65911)
 198                 dev_warn(&client->dev, "VMBCH-Threshold not specified");
 199
 200         ret = of_property_read_u32(np, "ti,vmbch2-threshold", &prop);
 201         if (!ret)
 202                 board_info->vmbch2_threshold = prop;
 203         else if (*chip_id == TPS65911)
 204                 dev_warn(&client->dev, "VMBCH2-Threshold not specified");
 205
 206         prop = of_property_read_bool(np, "ti,en-ck32k-xtal");
 207         board_info->en_ck32k_xtal = prop;
 208
 209         board_info->irq = client->irq;
 210         board_info->irq_base = -1;
 211         board_info->pm_off = of_property_read_bool(np,
 212                         "ti,system-power-controller");
 213
 214         return board_info;
 215 }
 216 #else
 217 static inline
 218 struct tps65910_board *tps65910_parse_dt(struct i2c_client *client,
 219                                          int *chip_id)
 220 {
 221         return NULL;
 222 }
 223 #endif
 224
 225 static struct i2c_client *tps65910_i2c_client;
 226 static void tps65910_power_off(void)
 227 {
 228         struct tps65910 *tps65910;
 229
 230         tps65910 = dev_get_drvdata(&tps65910_i2c_client->dev);
 231
 232         if (tps65910_reg_set_bits(tps65910, TPS65910_DEVCTRL,
 233                         DEVCTRL_PWR_OFF_MASK) < 0)
 234                 return;
 235
 236         tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
 237                         DEVCTRL_DEV_ON_MASK);
 238 }
 239
 240 static __devinit int tps65910_i2c_probe(struct i2c_client *i2c,
 241                                         const struct i2c_device_id *id)
 242 {
 243         struct tps65910 *tps65910;
 244         struct tps65910_board *pmic_plat_data;
 245         struct tps65910_board *of_pmic_plat_data = NULL;
 246         struct tps65910_platform_data *init_data;
 247         int ret = 0;
 248         int chip_id = id->driver_data;
 249
 250         pmic_plat_data = dev_get_platdata(&i2c->dev);
 251
 252         if (!pmic_plat_data && i2c->dev.of_node) {
 253                 pmic_plat_data = tps65910_parse_dt(i2c, &chip_id);
 254                 of_pmic_plat_data = pmic_plat_data;
 255         }
 256
 257         if (!pmic_plat_data)
 258                 return -EINVAL;
 259
 260         init_data = devm_kzalloc(&i2c->dev, sizeof(*init_data), GFP_KERNEL);
 261         if (init_data == NULL)
 262                 return -ENOMEM;
 263
 264         tps65910 = devm_kzalloc(&i2c->dev, sizeof(*tps65910), GFP_KERNEL);
 265         if (tps65910 == NULL)
 266                 return -ENOMEM;
 267
 268         tps65910->of_plat_data = of_pmic_plat_data;
 269         i2c_set_clientdata(i2c, tps65910);
 270         tps65910->dev = &i2c->dev;
 271         tps65910->i2c_client = i2c;
 272         tps65910->id = chip_id;
 273         mutex_init(&tps65910->io_mutex);
 274
 275         tps65910->regmap = devm_regmap_init_i2c(i2c, &tps65910_regmap_config);
 276         if (IS_ERR(tps65910->regmap)) {
 277                 ret = PTR_ERR(tps65910->regmap);
 278                 dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret);
 279                 return ret;
 280         }
 281
 282         ret = mfd_add_devices(tps65910->dev, -1,
 283                               tps65910s, ARRAY_SIZE(tps65910s),
 284                               NULL, 0, NULL);
 285         if (ret < 0) {
 286                 dev_err(&i2c->dev, "mfd_add_devices failed: %d\n", ret);
 287                 return ret;
 288         }
 289
 290         init_data->irq = pmic_plat_data->irq;
 291         init_data->irq_base = pmic_plat_data->irq_base;
 292
 293         tps65910_irq_init(tps65910, init_data->irq, init_data);
 294         tps65910_ck32k_init(tps65910, pmic_plat_data);
 295         tps65910_sleepinit(tps65910, pmic_plat_data);
 296
 297         if (pmic_plat_data->pm_off && !pm_power_off) {
 298                 tps65910_i2c_client = i2c;
 299                 pm_power_off = tps65910_power_off;
 300         }
 301
 302         return ret;
 303 }
 304
 305 static __devexit int tps65910_i2c_remove(struct i2c_client *i2c)
 306 {
 307         struct tps65910 *tps65910 = i2c_get_clientdata(i2c);
 308
 309         tps65910_irq_exit(tps65910);
 310         mfd_remove_devices(tps65910->dev);
 311
 312         return 0;
 313 }
 314
 315 static const struct i2c_device_id tps65910_i2c_id[] = {
 316        { "tps65910", TPS65910 },
 317        { "tps65911", TPS65911 },
 318        { }
 319 };
 320 MODULE_DEVICE_TABLE(i2c, tps65910_i2c_id);
 321
 322
 323 static struct i2c_driver tps65910_i2c_driver = {
 324         .driver = {
 325                    .name = "tps65910",
 326                    .owner = THIS_MODULE,
 327                    .of_match_table = of_match_ptr(tps65910_of_match),
 328         },
 329         .probe = tps65910_i2c_probe,
 330         .remove = __devexit_p(tps65910_i2c_remove),
 331         .id_table = tps65910_i2c_id,
 332 };
 333
 334 static int __init tps65910_i2c_init(void)
 335 {
 336         return i2c_add_driver(&tps65910_i2c_driver);
 337 }
 338 /* init early so consumer devices can complete system boot */
 339 subsys_initcall(tps65910_i2c_init);
 340
 341 static void __exit tps65910_i2c_exit(void)
 342 {
 343         i2c_del_driver(&tps65910_i2c_driver);
 344 }
 345 module_exit(tps65910_i2c_exit);
 346
 347 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
 348 MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>");
 349 MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
 350 MODULE_LICENSE("GPL");