drivers/mfd/sec-core.c

   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
  30 static struct mfd_cell s5m8751_devs[] = {
  31         {
  32                 .name = "s5m8751-pmic",
  33         }, {
  34                 .name = "s5m-charger",
  35         }, {
  36                 .name = "s5m8751-codec",
  37         },
  38 };
  39
  40 static struct mfd_cell s5m8763_devs[] = {
  41         {
  42                 .name = "s5m8763-pmic",
  43         }, {
  44                 .name = "s5m-rtc",
  45         }, {
  46                 .name = "s5m-charger",
  47         },
  48 };
  49
  50 static struct mfd_cell s5m8767_devs[] = {
  51         {
  52                 .name = "s5m8767-pmic",
  53         }, {
  54                 .name = "s5m-rtc",
  55         },
  56 };
  57
  58 static struct mfd_cell s2mps11_devs[] = {
  59         {
  60                 .name = "s2mps11-pmic",
  61         },
  62 };
  63
  64 #ifdef CONFIG_OF
  65 static struct of_device_id sec_dt_match[] = {
  66         {       .compatible = "samsung,s5m8767-pmic",
  67                 .data = (void *)S5M8767X,
  68         },
  69         {},
  70 };
  71 #endif
  72
  73 int sec_reg_read(struct sec_pmic_dev *sec_pmic, u8 reg, void *dest)
  74 {
  75         return regmap_read(sec_pmic->regmap, reg, dest);
  76 }
  77 EXPORT_SYMBOL_GPL(sec_reg_read);
  78
  79 int 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 }
  83 EXPORT_SYMBOL_GPL(sec_bulk_read);
  84
  85 int sec_reg_write(struct sec_pmic_dev *sec_pmic, u8 reg, u8 value)
  86 {
  87         return regmap_write(sec_pmic->regmap, reg, value);
  88 }
  89 EXPORT_SYMBOL_GPL(sec_reg_write);
  90
  91 int 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 }
  95 EXPORT_SYMBOL_GPL(sec_bulk_write);
  96
  97 int 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 }
 101 EXPORT_SYMBOL_GPL(sec_reg_update);
 102
 103 static 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  */
 119 static 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
 139 static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
 140                                         struct device *dev)
 141 {
 142         return 0;
 143 }
 144 #endif
 145
 146 static 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
 159 static 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
 238 err:
 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
 245 static 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
 255 static const struct i2c_device_id sec_pmic_id[] = {
 256         { "sec_pmic", 0 },
 257         { }
 258 };
 259 MODULE_DEVICE_TABLE(i2c, sec_pmic_id);
 260
 261 static 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
 272 static int __init sec_pmic_init(void)
 273 {
 274         return i2c_add_driver(&sec_pmic_driver);
 275 }
 276
 277 subsys_initcall(sec_pmic_init);
 278
 279 static void __exit sec_pmic_exit(void)
 280 {
 281         i2c_del_driver(&sec_pmic_driver);
 282 }
 283 module_exit(sec_pmic_exit);
 284
 285 MODULE_AUTHOR("Sangbeom Kim <[email protected]>");
 286 MODULE_DESCRIPTION("Core support for the S5M MFD");
 287 MODULE_LICENSE("GPL");