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/regmap.h>
  29
  30static struct mfd_cell s5m8751_devs[] = {
  31        {
  32                .name = "s5m8751-pmic",
  33        }, {
  34                .name = "s5m-charger",
  35        }, {
  36                .name = "s5m8751-codec",
  37        },
  38};
  39
  40static struct mfd_cell s5m8763_devs[] = {
  41        {
  42                .name = "s5m8763-pmic",
  43        }, {
  44                .name = "s5m-rtc",
  45        }, {
  46                .name = "s5m-charger",
  47        },
  48};
  49
  50static struct mfd_cell s5m8767_devs[] = {
  51        {
  52                .name = "s5m8767-pmic",
  53        }, {
  54                .name = "s5m-rtc",
  55        },
  56};
  57
  58static struct mfd_cell s2mps11_devs[] = {
  59        {
  60                .name = "s2mps11-pmic",
  61        },
  62};
  63
  64#ifdef CONFIG_OF
  65static struct of_device_id sec_dt_match[] = {
  66        {       .compatible = "samsung,s5m8767-pmic",
  67                .data = (void *)S5M8767X,
  68        },
  69        {},
  70};
  71#endif
  72
  73int sec_reg_read(struct sec_pmic_dev *sec_pmic, u8 reg, void *dest)
  74{
  75        return regmap_read(sec_pmic->regmap, reg, dest);
  76}
  77EXPORT_SYMBOL_GPL(sec_reg_read);
  78
  79int sec_bulk_read(struct sec_pmic_dev *sec_pmic, u8 reg, int count, u8 *buf)
  80{
  81        return regmap_bulk_read(sec_pmic->regmap, reg, buf, count);
  82}
  83EXPORT_SYMBOL_GPL(sec_bulk_read);
  84
  85int sec_reg_write(struct sec_pmic_dev *sec_pmic, u8 reg, u8 value)
  86{
  87        return regmap_write(sec_pmic->regmap, reg, value);
  88}
  89EXPORT_SYMBOL_GPL(sec_reg_write);
  90
  91int sec_bulk_write(struct sec_pmic_dev *sec_pmic, u8 reg, int count, u8 *buf)
  92{
  93        return regmap_raw_write(sec_pmic->regmap, reg, buf, count);
  94}
  95EXPORT_SYMBOL_GPL(sec_bulk_write);
  96
  97int sec_reg_update(struct sec_pmic_dev *sec_pmic, u8 reg, u8 val, u8 mask)
  98{
  99        return regmap_update_bits(sec_pmic->regmap, reg, mask, val);
 100}
 101EXPORT_SYMBOL_GPL(sec_reg_update);
 102
 103static struct regmap_config sec_regmap_config = {
 104        .reg_bits = 8,
 105        .val_bits = 8,
 106};
 107
 108
 109#ifdef CONFIG_OF
 110/*
 111 * Only the common platform data elements for s5m8767 are parsed here from the
 112 * device tree. Other sub-modules of s5m8767 such as pmic, rtc , charger and
 113 * others have to parse their own platform data elements from device tree.
 114 *
 115 * The s5m8767 platform data structure is instantiated here and the drivers for
 116 * the sub-modules need not instantiate another instance while parsing their
 117 * platform data.
 118 */
 119static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
 120                                        struct device *dev)
 121{
 122        struct sec_platform_data *pd;
 123
 124        pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
 125        if (!pd) {
 126                dev_err(dev, "could not allocate memory for pdata\n");
 127                return ERR_PTR(-ENOMEM);
 128        }
 129
 130        /*
 131         * ToDo: the 'wakeup' member in the platform data is more of a linux
 132         * specfic information. Hence, there is no binding for that yet and
 133         * not parsed here.
 134         */
 135
 136        return pd;
 137}
 138#else
 139static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
 140                                        struct device *dev)
 141{
 142        return 0;
 143}
 144#endif
 145
 146static inline int sec_i2c_get_driver_data(struct i2c_client *i2c,
 147                                                const struct i2c_device_id *id)
 148{
 149#ifdef CONFIG_OF
 150        if (i2c->dev.of_node) {
 151                const struct of_device_id *match;
 152                match = of_match_node(sec_dt_match, i2c->dev.of_node);
 153                return (int)match->data;
 154        }
 155#endif
 156        return (int)id->driver_data;
 157}
 158
 159static int sec_pmic_probe(struct i2c_client *i2c,
 160                            const struct i2c_device_id *id)
 161{
 162        struct sec_platform_data *pdata = i2c->dev.platform_data;
 163        struct sec_pmic_dev *sec_pmic;
 164        int ret;
 165
 166        sec_pmic = devm_kzalloc(&i2c->dev, sizeof(struct sec_pmic_dev),
 167                                GFP_KERNEL);
 168        if (sec_pmic == NULL)
 169                return -ENOMEM;
 170
 171        i2c_set_clientdata(i2c, sec_pmic);
 172        sec_pmic->dev = &i2c->dev;
 173        sec_pmic->i2c = i2c;
 174        sec_pmic->irq = i2c->irq;
 175        sec_pmic->type = sec_i2c_get_driver_data(i2c, id);
 176
 177        if (sec_pmic->dev->of_node) {
 178                pdata = sec_pmic_i2c_parse_dt_pdata(sec_pmic->dev);
 179                if (IS_ERR(pdata)) {
 180                        ret = PTR_ERR(pdata);
 181                        return ret;
 182                }
 183                pdata->device_type = sec_pmic->type;
 184        }
 185        if (pdata) {
 186                sec_pmic->device_type = pdata->device_type;
 187                sec_pmic->ono = pdata->ono;
 188                sec_pmic->irq_base = pdata->irq_base;
 189                sec_pmic->wakeup = pdata->wakeup;
 190                sec_pmic->pdata = pdata;
 191        }
 192
 193        sec_pmic->regmap = devm_regmap_init_i2c(i2c, &sec_regmap_config);
 194        if (IS_ERR(sec_pmic->regmap)) {
 195                ret = PTR_ERR(sec_pmic->regmap);
 196                dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
 197                        ret);
 198                return ret;
 199        }
 200
 201        sec_pmic->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
 202        i2c_set_clientdata(sec_pmic->rtc, sec_pmic);
 203
 204        if (pdata && pdata->cfg_pmic_irq)
 205                pdata->cfg_pmic_irq();
 206
 207        sec_irq_init(sec_pmic);
 208
 209        pm_runtime_set_active(sec_pmic->dev);
 210
 211        switch (sec_pmic->device_type) {
 212        case S5M8751X:
 213                ret = mfd_add_devices(sec_pmic->dev, -1, s5m8751_devs,
 214                                      ARRAY_SIZE(s5m8751_devs), NULL, 0, NULL);
 215                break;
 216        case S5M8763X:
 217                ret = mfd_add_devices(sec_pmic->dev, -1, s5m8763_devs,
 218                                      ARRAY_SIZE(s5m8763_devs), NULL, 0, NULL);
 219                break;
 220        case S5M8767X:
 221                ret = mfd_add_devices(sec_pmic->dev, -1, s5m8767_devs,
 222                                      ARRAY_SIZE(s5m8767_devs), NULL, 0, NULL);
 223                break;
 224        case S2MPS11X:
 225                ret = mfd_add_devices(sec_pmic->dev, -1, s2mps11_devs,
 226                                      ARRAY_SIZE(s2mps11_devs), NULL, 0, NULL);
 227                break;
 228        default:
 229                /* If this happens the probe function is problem */
 230                BUG();
 231        }
 232
 233        if (ret < 0)
 234                goto err;
 235
 236        return ret;
 237
 238err:
 239        mfd_remove_devices(sec_pmic->dev);
 240        sec_irq_exit(sec_pmic);
 241        i2c_unregister_device(sec_pmic->rtc);
 242        return ret;
 243}
 244
 245static int sec_pmic_remove(struct i2c_client *i2c)
 246{
 247        struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
 248
 249        mfd_remove_devices(sec_pmic->dev);
 250        sec_irq_exit(sec_pmic);
 251        i2c_unregister_device(sec_pmic->rtc);
 252        return 0;
 253}
 254
 255static const struct i2c_device_id sec_pmic_id[] = {
 256        { "sec_pmic", 0 },
 257        { }
 258};
 259MODULE_DEVICE_TABLE(i2c, sec_pmic_id);
 260
 261static struct i2c_driver sec_pmic_driver = {
 262        .driver = {
 263                   .name = "sec_pmic",
 264                   .owner = THIS_MODULE,
 265                   .of_match_table = of_match_ptr(sec_dt_match),
 266        },
 267        .probe = sec_pmic_probe,
 268        .remove = sec_pmic_remove,
 269        .id_table = sec_pmic_id,
 270};
 271
 272static int __init sec_pmic_init(void)
 273{
 274        return i2c_add_driver(&sec_pmic_driver);
 275}
 276
 277subsys_initcall(sec_pmic_init);
 278
 279static void __exit sec_pmic_exit(void)
 280{
 281        i2c_del_driver(&sec_pmic_driver);
 282}
 283module_exit(sec_pmic_exit);
 284
 285MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 286MODULE_DESCRIPTION("Core support for the S5M MFD");
 287MODULE_LICENSE("GPL");
 288
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