linux/drivers/mfd/tps65910.c
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   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
  27static 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
  43static 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
  63static 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
  71static 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
  89static 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
 144disable_dev_slp:
 145        tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
 146                                DEVCTRL_DEV_SLP_MASK);
 147
 148err_sleep_init:
 149        return ret;
 150}
 151
 152#ifdef CONFIG_OF
 153static struct of_device_id tps65910_of_match[] = {
 154        { .compatible = "ti,tps65910", .data = (void *)TPS65910},
 155        { .compatible = "ti,tps65911", .data = (void *)TPS65911},
 156        { },
 157};
 158MODULE_DEVICE_TABLE(of, tps65910_of_match);
 159
 160static 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
 205static inline
 206struct tps65910_board *tps65910_parse_dt(struct i2c_client *client,
 207                                         int *chip_id)
 208{
 209        return NULL;
 210}
 211#endif
 212
 213static __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
 273static __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
 283static const struct i2c_device_id tps65910_i2c_id[] = {
 284       { "tps65910", TPS65910 },
 285       { "tps65911", TPS65911 },
 286       { }
 287};
 288MODULE_DEVICE_TABLE(i2c, tps65910_i2c_id);
 289
 290
 291static 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
 302static 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 */
 307subsys_initcall(tps65910_i2c_init);
 308
 309static void __exit tps65910_i2c_exit(void)
 310{
 311        i2c_del_driver(&tps65910_i2c_driver);
 312}
 313module_exit(tps65910_i2c_exit);
 314
 315MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
 316MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>");
 317MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
 318MODULE_LICENSE("GPL");
 319
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