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 resource rtc_resources[] = {
  28        {
  29                .start  = TPS65910_IRQ_RTC_ALARM,
  30                .end    = TPS65910_IRQ_RTC_ALARM,
  31                .flags  = IORESOURCE_IRQ,
  32        }
  33};
  34
  35static 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
  53static 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
  73static 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
  81static 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
  99static 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
 154disable_dev_slp:
 155        tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
 156                                DEVCTRL_DEV_SLP_MASK);
 157
 158err_sleep_init:
 159        return ret;
 160}
 161
 162#ifdef CONFIG_OF
 163static struct of_device_id tps65910_of_match[] = {
 164        { .compatible = "ti,tps65910", .data = (void *)TPS65910},
 165        { .compatible = "ti,tps65911", .data = (void *)TPS65911},
 166        { },
 167};
 168MODULE_DEVICE_TABLE(of, tps65910_of_match);
 169
 170static 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
 217static inline
 218struct tps65910_board *tps65910_parse_dt(struct i2c_client *client,
 219                                         int *chip_id)
 220{
 221        return NULL;
 222}
 223#endif
 224
 225static struct i2c_client *tps65910_i2c_client;
 226static 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
 240static __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
 305static __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
 315static const struct i2c_device_id tps65910_i2c_id[] = {
 316       { "tps65910", TPS65910 },
 317       { "tps65911", TPS65911 },
 318       { }
 319};
 320MODULE_DEVICE_TABLE(i2c, tps65910_i2c_id);
 321
 322
 323static 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
 334static 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 */
 339subsys_initcall(tps65910_i2c_init);
 340
 341static void __exit tps65910_i2c_exit(void)
 342{
 343        i2c_del_driver(&tps65910_i2c_driver);
 344}
 345module_exit(tps65910_i2c_exit);
 346
 347MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
 348MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>");
 349MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
 350MODULE_LICENSE("GPL");
 351
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