linux/drivers/mfd/sec-core.c
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   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};
  66
  67#ifdef CONFIG_OF
  68static struct of_device_id sec_dt_match[] = {
  69        {       .compatible = "samsung,s5m8767-pmic",
  70                .data = (void *)S5M8767X,
  71        },
  72        {},
  73};
  74#endif
  75
  76int sec_reg_read(struct sec_pmic_dev *sec_pmic, u8 reg, void *dest)
  77{
  78        return regmap_read(sec_pmic->regmap, reg, dest);
  79}
  80EXPORT_SYMBOL_GPL(sec_reg_read);
  81
  82int sec_bulk_read(struct sec_pmic_dev *sec_pmic, u8 reg, int count, u8 *buf)
  83{
  84        return regmap_bulk_read(sec_pmic->regmap, reg, buf, count);
  85}
  86EXPORT_SYMBOL_GPL(sec_bulk_read);
  87
  88int sec_reg_write(struct sec_pmic_dev *sec_pmic, u8 reg, u8 value)
  89{
  90        return regmap_write(sec_pmic->regmap, reg, value);
  91}
  92EXPORT_SYMBOL_GPL(sec_reg_write);
  93
  94int sec_bulk_write(struct sec_pmic_dev *sec_pmic, u8 reg, int count, u8 *buf)
  95{
  96        return regmap_raw_write(sec_pmic->regmap, reg, buf, count);
  97}
  98EXPORT_SYMBOL_GPL(sec_bulk_write);
  99
 100int sec_reg_update(struct sec_pmic_dev *sec_pmic, u8 reg, u8 val, u8 mask)
 101{
 102        return regmap_update_bits(sec_pmic->regmap, reg, mask, val);
 103}
 104EXPORT_SYMBOL_GPL(sec_reg_update);
 105
 106static struct regmap_config sec_regmap_config = {
 107        .reg_bits = 8,
 108        .val_bits = 8,
 109};
 110
 111static struct regmap_config s2mps11_regmap_config = {
 112        .reg_bits = 8,
 113        .val_bits = 8,
 114
 115        .max_register = S2MPS11_REG_L38CTRL,
 116};
 117
 118static struct regmap_config s5m8763_regmap_config = {
 119        .reg_bits = 8,
 120        .val_bits = 8,
 121
 122        .max_register = S5M8763_REG_LBCNFG2,
 123};
 124
 125static struct regmap_config s5m8767_regmap_config = {
 126        .reg_bits = 8,
 127        .val_bits = 8,
 128
 129        .max_register = S5M8767_REG_LDO28CTRL,
 130};
 131
 132#ifdef CONFIG_OF
 133/*
 134 * Only the common platform data elements for s5m8767 are parsed here from the
 135 * device tree. Other sub-modules of s5m8767 such as pmic, rtc , charger and
 136 * others have to parse their own platform data elements from device tree.
 137 *
 138 * The s5m8767 platform data structure is instantiated here and the drivers for
 139 * the sub-modules need not instantiate another instance while parsing their
 140 * platform data.
 141 */
 142static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
 143                                        struct device *dev)
 144{
 145        struct sec_platform_data *pd;
 146
 147        pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
 148        if (!pd) {
 149                dev_err(dev, "could not allocate memory for pdata\n");
 150                return ERR_PTR(-ENOMEM);
 151        }
 152
 153        /*
 154         * ToDo: the 'wakeup' member in the platform data is more of a linux
 155         * specfic information. Hence, there is no binding for that yet and
 156         * not parsed here.
 157         */
 158
 159        return pd;
 160}
 161#else
 162static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
 163                                        struct device *dev)
 164{
 165        return 0;
 166}
 167#endif
 168
 169static inline int sec_i2c_get_driver_data(struct i2c_client *i2c,
 170                                                const struct i2c_device_id *id)
 171{
 172#ifdef CONFIG_OF
 173        if (i2c->dev.of_node) {
 174                const struct of_device_id *match;
 175                match = of_match_node(sec_dt_match, i2c->dev.of_node);
 176                return (int)match->data;
 177        }
 178#endif
 179        return (int)id->driver_data;
 180}
 181
 182static int sec_pmic_probe(struct i2c_client *i2c,
 183                            const struct i2c_device_id *id)
 184{
 185        struct sec_platform_data *pdata = i2c->dev.platform_data;
 186        const struct regmap_config *regmap;
 187        struct sec_pmic_dev *sec_pmic;
 188        int ret;
 189
 190        sec_pmic = devm_kzalloc(&i2c->dev, sizeof(struct sec_pmic_dev),
 191                                GFP_KERNEL);
 192        if (sec_pmic == NULL)
 193                return -ENOMEM;
 194
 195        i2c_set_clientdata(i2c, sec_pmic);
 196        sec_pmic->dev = &i2c->dev;
 197        sec_pmic->i2c = i2c;
 198        sec_pmic->irq = i2c->irq;
 199        sec_pmic->type = sec_i2c_get_driver_data(i2c, id);
 200
 201        if (sec_pmic->dev->of_node) {
 202                pdata = sec_pmic_i2c_parse_dt_pdata(sec_pmic->dev);
 203                if (IS_ERR(pdata)) {
 204                        ret = PTR_ERR(pdata);
 205                        return ret;
 206                }
 207                pdata->device_type = sec_pmic->type;
 208        }
 209        if (pdata) {
 210                sec_pmic->device_type = pdata->device_type;
 211                sec_pmic->ono = pdata->ono;
 212                sec_pmic->irq_base = pdata->irq_base;
 213                sec_pmic->wakeup = pdata->wakeup;
 214                sec_pmic->pdata = pdata;
 215        }
 216
 217        switch (sec_pmic->device_type) {
 218        case S2MPS11X:
 219                regmap = &s2mps11_regmap_config;
 220                break;
 221        case S5M8763X:
 222                regmap = &s5m8763_regmap_config;
 223                break;
 224        case S5M8767X:
 225                regmap = &s5m8767_regmap_config;
 226                break;
 227        default:
 228                regmap = &sec_regmap_config;
 229                break;
 230        }
 231
 232        sec_pmic->regmap = devm_regmap_init_i2c(i2c, regmap);
 233        if (IS_ERR(sec_pmic->regmap)) {
 234                ret = PTR_ERR(sec_pmic->regmap);
 235                dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
 236                        ret);
 237                return ret;
 238        }
 239
 240        sec_pmic->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
 241        i2c_set_clientdata(sec_pmic->rtc, sec_pmic);
 242
 243        if (pdata && pdata->cfg_pmic_irq)
 244                pdata->cfg_pmic_irq();
 245
 246        sec_irq_init(sec_pmic);
 247
 248        pm_runtime_set_active(sec_pmic->dev);
 249
 250        switch (sec_pmic->device_type) {
 251        case S5M8751X:
 252                ret = mfd_add_devices(sec_pmic->dev, -1, s5m8751_devs,
 253                                      ARRAY_SIZE(s5m8751_devs), NULL, 0, NULL);
 254                break;
 255        case S5M8763X:
 256                ret = mfd_add_devices(sec_pmic->dev, -1, s5m8763_devs,
 257                                      ARRAY_SIZE(s5m8763_devs), NULL, 0, NULL);
 258                break;
 259        case S5M8767X:
 260                ret = mfd_add_devices(sec_pmic->dev, -1, s5m8767_devs,
 261                                      ARRAY_SIZE(s5m8767_devs), NULL, 0, NULL);
 262                break;
 263        case S2MPS11X:
 264                ret = mfd_add_devices(sec_pmic->dev, -1, s2mps11_devs,
 265                                      ARRAY_SIZE(s2mps11_devs), NULL, 0, NULL);
 266                break;
 267        default:
 268                /* If this happens the probe function is problem */
 269                BUG();
 270        }
 271
 272        if (ret)
 273                goto err;
 274
 275        return ret;
 276
 277err:
 278        sec_irq_exit(sec_pmic);
 279        i2c_unregister_device(sec_pmic->rtc);
 280        return ret;
 281}
 282
 283static int sec_pmic_remove(struct i2c_client *i2c)
 284{
 285        struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
 286
 287        mfd_remove_devices(sec_pmic->dev);
 288        sec_irq_exit(sec_pmic);
 289        i2c_unregister_device(sec_pmic->rtc);
 290        return 0;
 291}
 292
 293static const struct i2c_device_id sec_pmic_id[] = {
 294        { "sec_pmic", 0 },
 295        { }
 296};
 297MODULE_DEVICE_TABLE(i2c, sec_pmic_id);
 298
 299static struct i2c_driver sec_pmic_driver = {
 300        .driver = {
 301                   .name = "sec_pmic",
 302                   .owner = THIS_MODULE,
 303                   .of_match_table = of_match_ptr(sec_dt_match),
 304        },
 305        .probe = sec_pmic_probe,
 306        .remove = sec_pmic_remove,
 307        .id_table = sec_pmic_id,
 308};
 309
 310static int __init sec_pmic_init(void)
 311{
 312        return i2c_add_driver(&sec_pmic_driver);
 313}
 314
 315subsys_initcall(sec_pmic_init);
 316
 317static void __exit sec_pmic_exit(void)
 318{
 319        i2c_del_driver(&sec_pmic_driver);
 320}
 321module_exit(sec_pmic_exit);
 322
 323MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 324MODULE_DESCRIPTION("Core support for the S5M MFD");
 325MODULE_LICENSE("GPL");
 326
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