linux/drivers/mfd/sec-core.c
<<
>>
Prefs
   1/*
   2 * sec-core.c
   3 *
   4 * Copyright (c) 2012 Samsung Electronics Co., Ltd
   5 *              http://www.samsung.com
   6 *
   7 *  This program is free software; you can redistribute  it and/or modify it
   8 *  under  the terms of  the GNU General  Public License as published by the
   9 *  Free Software Foundation;  either version 2 of the  License, or (at your
  10 *  option) any later version.
  11 *
  12 */
  13
  14#include <linux/module.h>
  15#include <linux/moduleparam.h>
  16#include <linux/init.h>
  17#include <linux/err.h>
  18#include <linux/slab.h>
  19#include <linux/i2c.h>
  20#include <linux/of_irq.h>
  21#include <linux/interrupt.h>
  22#include <linux/pm_runtime.h>
  23#include <linux/mutex.h>
  24#include <linux/mfd/core.h>
  25#include <linux/mfd/samsung/core.h>
  26#include <linux/mfd/samsung/irq.h>
  27#include <linux/mfd/samsung/rtc.h>
  28#include <linux/mfd/samsung/s2mps11.h>
  29#include <linux/mfd/samsung/s5m8763.h>
  30#include <linux/mfd/samsung/s5m8767.h>
  31#include <linux/regmap.h>
  32
  33static struct mfd_cell s5m8751_devs[] = {
  34        {
  35                .name = "s5m8751-pmic",
  36        }, {
  37                .name = "s5m-charger",
  38        }, {
  39                .name = "s5m8751-codec",
  40        },
  41};
  42
  43static struct mfd_cell s5m8763_devs[] = {
  44        {
  45                .name = "s5m8763-pmic",
  46        }, {
  47                .name = "s5m-rtc",
  48        }, {
  49                .name = "s5m-charger",
  50        },
  51};
  52
  53static struct mfd_cell s5m8767_devs[] = {
  54        {
  55                .name = "s5m8767-pmic",
  56        }, {
  57                .name = "s5m-rtc",
  58        },
  59};
  60
  61static struct mfd_cell s2mps11_devs[] = {
  62        {
  63                .name = "s2mps11-pmic",
  64        }, {
  65                .name = "s2mps11-clk",
  66        }
  67};
  68
  69#ifdef CONFIG_OF
  70static struct of_device_id sec_dt_match[] = {
  71        {       .compatible = "samsung,s5m8767-pmic",
  72                .data = (void *)S5M8767X,
  73        },
  74        {       .compatible = "samsung,s2mps11-pmic",
  75                .data = (void *)S2MPS11X,
  76        },
  77        {},
  78};
  79#endif
  80
  81int sec_reg_read(struct sec_pmic_dev *sec_pmic, u8 reg, void *dest)
  82{
  83        return regmap_read(sec_pmic->regmap, reg, dest);
  84}
  85EXPORT_SYMBOL_GPL(sec_reg_read);
  86
  87int sec_bulk_read(struct sec_pmic_dev *sec_pmic, u8 reg, int count, u8 *buf)
  88{
  89        return regmap_bulk_read(sec_pmic->regmap, reg, buf, count);
  90}
  91EXPORT_SYMBOL_GPL(sec_bulk_read);
  92
  93int sec_reg_write(struct sec_pmic_dev *sec_pmic, u8 reg, u8 value)
  94{
  95        return regmap_write(sec_pmic->regmap, reg, value);
  96}
  97EXPORT_SYMBOL_GPL(sec_reg_write);
  98
  99int sec_bulk_write(struct sec_pmic_dev *sec_pmic, u8 reg, int count, u8 *buf)
 100{
 101        return regmap_raw_write(sec_pmic->regmap, reg, buf, count);
 102}
 103EXPORT_SYMBOL_GPL(sec_bulk_write);
 104
 105int sec_reg_update(struct sec_pmic_dev *sec_pmic, u8 reg, u8 val, u8 mask)
 106{
 107        return regmap_update_bits(sec_pmic->regmap, reg, mask, val);
 108}
 109EXPORT_SYMBOL_GPL(sec_reg_update);
 110
 111static bool s2mps11_volatile(struct device *dev, unsigned int reg)
 112{
 113        switch (reg) {
 114        case S2MPS11_REG_INT1M:
 115        case S2MPS11_REG_INT2M:
 116        case S2MPS11_REG_INT3M:
 117                return false;
 118        default:
 119                return true;
 120        }
 121}
 122
 123static bool s5m8763_volatile(struct device *dev, unsigned int reg)
 124{
 125        switch (reg) {
 126        case S5M8763_REG_IRQM1:
 127        case S5M8763_REG_IRQM2:
 128        case S5M8763_REG_IRQM3:
 129        case S5M8763_REG_IRQM4:
 130                return false;
 131        default:
 132                return true;
 133        }
 134}
 135
 136static struct regmap_config sec_regmap_config = {
 137        .reg_bits = 8,
 138        .val_bits = 8,
 139};
 140
 141static struct regmap_config s2mps11_regmap_config = {
 142        .reg_bits = 8,
 143        .val_bits = 8,
 144
 145        .max_register = S2MPS11_REG_L38CTRL,
 146        .volatile_reg = s2mps11_volatile,
 147        .cache_type = REGCACHE_FLAT,
 148};
 149
 150static struct regmap_config s5m8763_regmap_config = {
 151        .reg_bits = 8,
 152        .val_bits = 8,
 153
 154        .max_register = S5M8763_REG_LBCNFG2,
 155        .volatile_reg = s5m8763_volatile,
 156        .cache_type = REGCACHE_FLAT,
 157};
 158
 159static struct regmap_config s5m8767_regmap_config = {
 160        .reg_bits = 8,
 161        .val_bits = 8,
 162
 163        .max_register = S5M8767_REG_LDO28CTRL,
 164        .volatile_reg = s2mps11_volatile,
 165        .cache_type = REGCACHE_FLAT,
 166};
 167
 168#ifdef CONFIG_OF
 169/*
 170 * Only the common platform data elements for s5m8767 are parsed here from the
 171 * device tree. Other sub-modules of s5m8767 such as pmic, rtc , charger and
 172 * others have to parse their own platform data elements from device tree.
 173 *
 174 * The s5m8767 platform data structure is instantiated here and the drivers for
 175 * the sub-modules need not instantiate another instance while parsing their
 176 * platform data.
 177 */
 178static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
 179                                        struct device *dev)
 180{
 181        struct sec_platform_data *pd;
 182
 183        pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
 184        if (!pd) {
 185                dev_err(dev, "could not allocate memory for pdata\n");
 186                return ERR_PTR(-ENOMEM);
 187        }
 188
 189        /*
 190         * ToDo: the 'wakeup' member in the platform data is more of a linux
 191         * specfic information. Hence, there is no binding for that yet and
 192         * not parsed here.
 193         */
 194
 195        return pd;
 196}
 197#else
 198static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
 199                                        struct device *dev)
 200{
 201        return 0;
 202}
 203#endif
 204
 205static inline int sec_i2c_get_driver_data(struct i2c_client *i2c,
 206                                                const struct i2c_device_id *id)
 207{
 208#ifdef CONFIG_OF
 209        if (i2c->dev.of_node) {
 210                const struct of_device_id *match;
 211                match = of_match_node(sec_dt_match, i2c->dev.of_node);
 212                return (int)match->data;
 213        }
 214#endif
 215        return (int)id->driver_data;
 216}
 217
 218static int sec_pmic_probe(struct i2c_client *i2c,
 219                            const struct i2c_device_id *id)
 220{
 221        struct sec_platform_data *pdata = dev_get_platdata(&i2c->dev);
 222        const struct regmap_config *regmap;
 223        struct sec_pmic_dev *sec_pmic;
 224        int ret;
 225
 226        sec_pmic = devm_kzalloc(&i2c->dev, sizeof(struct sec_pmic_dev),
 227                                GFP_KERNEL);
 228        if (sec_pmic == NULL)
 229                return -ENOMEM;
 230
 231        i2c_set_clientdata(i2c, sec_pmic);
 232        sec_pmic->dev = &i2c->dev;
 233        sec_pmic->i2c = i2c;
 234        sec_pmic->irq = i2c->irq;
 235        sec_pmic->type = sec_i2c_get_driver_data(i2c, id);
 236
 237        if (sec_pmic->dev->of_node) {
 238                pdata = sec_pmic_i2c_parse_dt_pdata(sec_pmic->dev);
 239                if (IS_ERR(pdata)) {
 240                        ret = PTR_ERR(pdata);
 241                        return ret;
 242                }
 243                pdata->device_type = sec_pmic->type;
 244        }
 245        if (pdata) {
 246                sec_pmic->device_type = pdata->device_type;
 247                sec_pmic->ono = pdata->ono;
 248                sec_pmic->irq_base = pdata->irq_base;
 249                sec_pmic->wakeup = pdata->wakeup;
 250                sec_pmic->pdata = pdata;
 251        }
 252
 253        switch (sec_pmic->device_type) {
 254        case S2MPS11X:
 255                regmap = &s2mps11_regmap_config;
 256                break;
 257        case S5M8763X:
 258                regmap = &s5m8763_regmap_config;
 259                break;
 260        case S5M8767X:
 261                regmap = &s5m8767_regmap_config;
 262                break;
 263        default:
 264                regmap = &sec_regmap_config;
 265                break;
 266        }
 267
 268        sec_pmic->regmap = devm_regmap_init_i2c(i2c, regmap);
 269        if (IS_ERR(sec_pmic->regmap)) {
 270                ret = PTR_ERR(sec_pmic->regmap);
 271                dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
 272                        ret);
 273                return ret;
 274        }
 275
 276        sec_pmic->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
 277        i2c_set_clientdata(sec_pmic->rtc, sec_pmic);
 278
 279        if (pdata && pdata->cfg_pmic_irq)
 280                pdata->cfg_pmic_irq();
 281
 282        sec_irq_init(sec_pmic);
 283
 284        pm_runtime_set_active(sec_pmic->dev);
 285
 286        switch (sec_pmic->device_type) {
 287        case S5M8751X:
 288                ret = mfd_add_devices(sec_pmic->dev, -1, s5m8751_devs,
 289                                      ARRAY_SIZE(s5m8751_devs), NULL, 0, NULL);
 290                break;
 291        case S5M8763X:
 292                ret = mfd_add_devices(sec_pmic->dev, -1, s5m8763_devs,
 293                                      ARRAY_SIZE(s5m8763_devs), NULL, 0, NULL);
 294                break;
 295        case S5M8767X:
 296                ret = mfd_add_devices(sec_pmic->dev, -1, s5m8767_devs,
 297                                      ARRAY_SIZE(s5m8767_devs), NULL, 0, NULL);
 298                break;
 299        case S2MPS11X:
 300                ret = mfd_add_devices(sec_pmic->dev, -1, s2mps11_devs,
 301                                      ARRAY_SIZE(s2mps11_devs), NULL, 0, NULL);
 302                break;
 303        default:
 304                /* If this happens the probe function is problem */
 305                BUG();
 306        }
 307
 308        if (ret)
 309                goto err;
 310
 311        return ret;
 312
 313err:
 314        sec_irq_exit(sec_pmic);
 315        i2c_unregister_device(sec_pmic->rtc);
 316        return ret;
 317}
 318
 319static int sec_pmic_remove(struct i2c_client *i2c)
 320{
 321        struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
 322
 323        mfd_remove_devices(sec_pmic->dev);
 324        sec_irq_exit(sec_pmic);
 325        i2c_unregister_device(sec_pmic->rtc);
 326        return 0;
 327}
 328
 329static const struct i2c_device_id sec_pmic_id[] = {
 330        { "sec_pmic", 0 },
 331        { }
 332};
 333MODULE_DEVICE_TABLE(i2c, sec_pmic_id);
 334
 335static struct i2c_driver sec_pmic_driver = {
 336        .driver = {
 337                   .name = "sec_pmic",
 338                   .owner = THIS_MODULE,
 339                   .of_match_table = of_match_ptr(sec_dt_match),
 340        },
 341        .probe = sec_pmic_probe,
 342        .remove = sec_pmic_remove,
 343        .id_table = sec_pmic_id,
 344};
 345
 346static int __init sec_pmic_init(void)
 347{
 348        return i2c_add_driver(&sec_pmic_driver);
 349}
 350
 351subsys_initcall(sec_pmic_init);
 352
 353static void __exit sec_pmic_exit(void)
 354{
 355        i2c_del_driver(&sec_pmic_driver);
 356}
 357module_exit(sec_pmic_exit);
 358
 359MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 360MODULE_DESCRIPTION("Core support for the S5M MFD");
 361MODULE_LICENSE("GPL");
 362
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.