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_ck32k_init(struct tps65910 *tps65910,
  72                                         struct tps65910_board *pmic_pdata)
  73 {
  74         int ret;
  75
  76         if (!pmic_pdata->en_ck32k_xtal)
  77                 return 0;
  78
  79         ret = tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
  80                                                 DEVCTRL_CK32K_CTRL_MASK);
  81         if (ret < 0) {
  82                 dev_err(tps65910->dev, "clear ck32k_ctrl failed: %d\n", ret);
  83                 return ret;
  84         }
  85
  86         return 0;
  87 }
  88
  89 static int __devinit tps65910_sleepinit(struct tps65910 *tps65910,
  90                 struct tps65910_board *pmic_pdata)
  91 {
  92         struct device *dev = NULL;
  93         int ret = 0;
  94
  95         dev = tps65910->dev;
  96
  97         if (!pmic_pdata->en_dev_slp)
  98                 return 0;
  99
 100         /* enabling SLEEP device state */
 101         ret = tps65910_reg_set_bits(tps65910, TPS65910_DEVCTRL,
 102                                 DEVCTRL_DEV_SLP_MASK);
 103         if (ret < 0) {
 104                 dev_err(dev, "set dev_slp failed: %d\n", ret);
 105                 goto err_sleep_init;
 106         }
 107
 108         /* Return if there is no sleep keepon data. */
 109         if (!pmic_pdata->slp_keepon)
 110                 return 0;
 111
 112         if (pmic_pdata->slp_keepon->therm_keepon) {
 113                 ret = tps65910_reg_set_bits(tps65910,
 114                                 TPS65910_SLEEP_KEEP_RES_ON,
 115                                 SLEEP_KEEP_RES_ON_THERM_KEEPON_MASK);
 116                 if (ret < 0) {
 117                         dev_err(dev, "set therm_keepon failed: %d\n", ret);
 118                         goto disable_dev_slp;
 119                 }
 120         }
 121
 122         if (pmic_pdata->slp_keepon->clkout32k_keepon) {
 123                 ret = tps65910_reg_set_bits(tps65910,
 124                                 TPS65910_SLEEP_KEEP_RES_ON,
 125                                 SLEEP_KEEP_RES_ON_CLKOUT32K_KEEPON_MASK);
 126                 if (ret < 0) {
 127                         dev_err(dev, "set clkout32k_keepon failed: %d\n", ret);
 128                         goto disable_dev_slp;
 129                 }
 130         }
 131
 132         if (pmic_pdata->slp_keepon->i2chs_keepon) {
 133                 ret = tps65910_reg_set_bits(tps65910,
 134                                 TPS65910_SLEEP_KEEP_RES_ON,
 135                                 SLEEP_KEEP_RES_ON_I2CHS_KEEPON_MASK);
 136                 if (ret < 0) {
 137                         dev_err(dev, "set i2chs_keepon failed: %d\n", ret);
 138                         goto disable_dev_slp;
 139                 }
 140         }
 141
 142         return 0;
 143
 144 disable_dev_slp:
 145         tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
 146                                 DEVCTRL_DEV_SLP_MASK);
 147
 148 err_sleep_init:
 149         return ret;
 150 }
 151
 152 #ifdef CONFIG_OF
 153 static struct of_device_id tps65910_of_match[] = {
 154         { .compatible = "ti,tps65910", .data = (void *)TPS65910},
 155         { .compatible = "ti,tps65911", .data = (void *)TPS65911},
 156         { },
 157 };
 158 MODULE_DEVICE_TABLE(of, tps65910_of_match);
 159
 160 static struct tps65910_board *tps65910_parse_dt(struct i2c_client *client,
 161                                                 int *chip_id)
 162 {
 163         struct device_node *np = client->dev.of_node;
 164         struct tps65910_board *board_info;
 165         unsigned int prop;
 166         const struct of_device_id *match;
 167         int ret = 0;
 168
 169         match = of_match_device(tps65910_of_match, &client->dev);
 170         if (!match) {
 171                 dev_err(&client->dev, "Failed to find matching dt id\n");
 172                 return NULL;
 173         }
 174
 175         *chip_id  = (int)match->data;
 176
 177         board_info = devm_kzalloc(&client->dev, sizeof(*board_info),
 178                         GFP_KERNEL);
 179         if (!board_info) {
 180                 dev_err(&client->dev, "Failed to allocate pdata\n");
 181                 return NULL;
 182         }
 183
 184         ret = of_property_read_u32(np, "ti,vmbch-threshold", &prop);
 185         if (!ret)
 186                 board_info->vmbch_threshold = prop;
 187         else if (*chip_id == TPS65911)
 188                 dev_warn(&client->dev, "VMBCH-Threshold not specified");
 189
 190         ret = of_property_read_u32(np, "ti,vmbch2-threshold", &prop);
 191         if (!ret)
 192                 board_info->vmbch2_threshold = prop;
 193         else if (*chip_id == TPS65911)
 194                 dev_warn(&client->dev, "VMBCH2-Threshold not specified");
 195
 196         prop = of_property_read_bool(np, "ti,en-ck32k-xtal");
 197         board_info->en_ck32k_xtal = prop;
 198
 199         board_info->irq = client->irq;
 200         board_info->irq_base = -1;
 201
 202         return board_info;
 203 }
 204 #else
 205 static inline
 206 struct tps65910_board *tps65910_parse_dt(struct i2c_client *client,
 207                                          int *chip_id)
 208 {
 209         return NULL;
 210 }
 211 #endif
 212
 213 static __devinit int tps65910_i2c_probe(struct i2c_client *i2c,
 214                                         const struct i2c_device_id *id)
 215 {
 216         struct tps65910 *tps65910;
 217         struct tps65910_board *pmic_plat_data;
 218         struct tps65910_board *of_pmic_plat_data = NULL;
 219         struct tps65910_platform_data *init_data;
 220         int ret = 0;
 221         int chip_id = id->driver_data;
 222
 223         pmic_plat_data = dev_get_platdata(&i2c->dev);
 224
 225         if (!pmic_plat_data && i2c->dev.of_node) {
 226                 pmic_plat_data = tps65910_parse_dt(i2c, &chip_id);
 227                 of_pmic_plat_data = pmic_plat_data;
 228         }
 229
 230         if (!pmic_plat_data)
 231                 return -EINVAL;
 232
 233         init_data = devm_kzalloc(&i2c->dev, sizeof(*init_data), GFP_KERNEL);
 234         if (init_data == NULL)
 235                 return -ENOMEM;
 236
 237         tps65910 = devm_kzalloc(&i2c->dev, sizeof(*tps65910), GFP_KERNEL);
 238         if (tps65910 == NULL)
 239                 return -ENOMEM;
 240
 241         tps65910->of_plat_data = of_pmic_plat_data;
 242         i2c_set_clientdata(i2c, tps65910);
 243         tps65910->dev = &i2c->dev;
 244         tps65910->i2c_client = i2c;
 245         tps65910->id = chip_id;
 246         mutex_init(&tps65910->io_mutex);
 247
 248         tps65910->regmap = devm_regmap_init_i2c(i2c, &tps65910_regmap_config);
 249         if (IS_ERR(tps65910->regmap)) {
 250                 ret = PTR_ERR(tps65910->regmap);
 251                 dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret);
 252                 return ret;
 253         }
 254
 255         ret = mfd_add_devices(tps65910->dev, -1,
 256                               tps65910s, ARRAY_SIZE(tps65910s),
 257                               NULL, 0, NULL);
 258         if (ret < 0) {
 259                 dev_err(&i2c->dev, "mfd_add_devices failed: %d\n", ret);
 260                 return ret;
 261         }
 262
 263         init_data->irq = pmic_plat_data->irq;
 264         init_data->irq_base = pmic_plat_data->irq_base;
 265
 266         tps65910_irq_init(tps65910, init_data->irq, init_data);
 267         tps65910_ck32k_init(tps65910, pmic_plat_data);
 268         tps65910_sleepinit(tps65910, pmic_plat_data);
 269
 270         return ret;
 271 }
 272
 273 static __devexit int tps65910_i2c_remove(struct i2c_client *i2c)
 274 {
 275         struct tps65910 *tps65910 = i2c_get_clientdata(i2c);
 276
 277         tps65910_irq_exit(tps65910);
 278         mfd_remove_devices(tps65910->dev);
 279
 280         return 0;
 281 }
 282
 283 static const struct i2c_device_id tps65910_i2c_id[] = {
 284        { "tps65910", TPS65910 },
 285        { "tps65911", TPS65911 },
 286        { }
 287 };
 288 MODULE_DEVICE_TABLE(i2c, tps65910_i2c_id);
 289
 290
 291 static struct i2c_driver tps65910_i2c_driver = {
 292         .driver = {
 293                    .name = "tps65910",
 294                    .owner = THIS_MODULE,
 295                    .of_match_table = of_match_ptr(tps65910_of_match),
 296         },
 297         .probe = tps65910_i2c_probe,
 298         .remove = __devexit_p(tps65910_i2c_remove),
 299         .id_table = tps65910_i2c_id,
 300 };
 301
 302 static int __init tps65910_i2c_init(void)
 303 {
 304         return i2c_add_driver(&tps65910_i2c_driver);
 305 }
 306 /* init early so consumer devices can complete system boot */
 307 subsys_initcall(tps65910_i2c_init);
 308
 309 static void __exit tps65910_i2c_exit(void)
 310 {
 311         i2c_del_driver(&tps65910_i2c_driver);
 312 }
 313 module_exit(tps65910_i2c_exit);
 314
 315 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
 316 MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>");
 317 MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
 318 MODULE_LICENSE("GPL");