drivers/mfd/s5m-core.c

   1 /*
   2  * s5m87xx.c
   3  *
   4  * Copyright (c) 2011 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/interrupt.h>
  21 #include <linux/pm_runtime.h>
  22 #include <linux/mutex.h>
  23 #include <linux/mfd/core.h>
  24 #include <linux/mfd/s5m87xx/s5m-core.h>
  25 #include <linux/mfd/s5m87xx/s5m-pmic.h>
  26 #include <linux/mfd/s5m87xx/s5m-rtc.h>
  27 #include <linux/regmap.h>
  28
  29 #ifdef CONFIG_OF
  30 static struct of_device_id __devinitdata s5m87xx_pmic_dt_match[] = {
  31         {.compatible = "samsung,s5m8767-pmic"},
  32         {},
  33 };
  34 #endif
  35
  36 static struct mfd_cell s5m8751_devs[] = {
  37         {
  38                 .name = "s5m8751-pmic",
  39         }, {
  40                 .name = "s5m-charger",
  41         }, {
  42                 .name = "s5m8751-codec",
  43         },
  44 };
  45
  46 static struct mfd_cell s5m8763_devs[] = {
  47         {
  48                 .name = "s5m8763-pmic",
  49         }, {
  50                 .name = "s5m-rtc",
  51         }, {
  52                 .name = "s5m-charger",
  53         },
  54 };
  55
  56 static struct mfd_cell s5m8767_devs[] = {
  57         {
  58                 .name = "s5m8767-pmic",
  59         }, {
  60                 .name = "s5m-rtc",
  61         },
  62 };
  63
  64 int s5m_reg_read(struct s5m87xx_dev *s5m87xx, u8 reg, void *dest)
  65 {
  66         return regmap_read(s5m87xx->regmap, reg, dest);
  67 }
  68 EXPORT_SYMBOL_GPL(s5m_reg_read);
  69
  70 int s5m_bulk_read(struct s5m87xx_dev *s5m87xx, u8 reg, int count, u8 *buf)
  71 {
  72         return regmap_bulk_read(s5m87xx->regmap, reg, buf, count);
  73 }
  74 EXPORT_SYMBOL_GPL(s5m_bulk_read);
  75
  76 int s5m_reg_write(struct s5m87xx_dev *s5m87xx, u8 reg, u8 value)
  77 {
  78         return regmap_write(s5m87xx->regmap, reg, value);
  79 }
  80 EXPORT_SYMBOL_GPL(s5m_reg_write);
  81
  82 int s5m_bulk_write(struct s5m87xx_dev *s5m87xx, u8 reg, int count, u8 *buf)
  83 {
  84         return regmap_raw_write(s5m87xx->regmap, reg, buf, count);
  85 }
  86 EXPORT_SYMBOL_GPL(s5m_bulk_write);
  87
  88 int s5m_reg_update(struct s5m87xx_dev *s5m87xx, u8 reg, u8 val, u8 mask)
  89 {
  90         return regmap_update_bits(s5m87xx->regmap, reg, mask, val);
  91 }
  92 EXPORT_SYMBOL_GPL(s5m_reg_update);
  93
  94 static struct regmap_config s5m_regmap_config = {
  95         .reg_bits = 8,
  96         .val_bits = 8,
  97 };
  98
  99 static inline int s5m87xx_i2c_get_driver_data(struct i2c_client *i2c,
 100                                                const struct i2c_device_id *id)
 101 {
 102 #ifdef CONFIG_OF
 103         if (i2c->dev.of_node) {
 104                 const struct of_device_id *match;
 105                 match = of_match_node(s5m87xx_pmic_dt_match, i2c->dev.of_node);
 106                 return (int)match->data;
 107         }
 108 #endif
 109         return (int)id->driver_data;
 110 }
 111
 112 #ifdef CONFIG_OF
 113 static struct s5m_platform_data *s5m87xx_i2c_parse_dt_pdata(struct device *dev)
 114 {
 115         struct s5m_platform_data *pd;
 116
 117         pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
 118         if (!pd) {
 119                 dev_err(dev, "could not allocate memory for pdata\n");
 120                 return ERR_PTR(-ENOMEM);
 121         }
 122
 123         if (of_property_read_u32(dev->of_node, "s5m-core,device_type",
 124                                  &pd->device_type)) {
 125                 dev_warn(dev, "no OF device_type property");
 126         }
 127         dev_dbg(dev, "OF device_type property = %u", pd->device_type);
 128
 129         if (of_get_property(dev->of_node, "s5m-core,enable-low-jitter", NULL)) {
 130                 if (!(pd->device_type == S5M8767X))
 131                         dev_warn(dev, "no low-jitter for this PMIC type\n");
 132                 else
 133                         pd->low_jitter = true;
 134         }
 135         dev_dbg(dev, "OF low-jitter property: %u\n", pd->low_jitter);
 136
 137         return pd;
 138 }
 139 #else
 140 static struct s5m_platform_data *s5m87xx_i2c_parse_dt_pdata(struct device *dev)
 141 {
 142         return 0;
 143 }
 144 #endif
 145
 146 static int s5m87xx_set_low_jitter(struct s5m87xx_dev *s5m87xx)
 147 {
 148         if (!s5m87xx->pdata->low_jitter)
 149                 return 0;
 150
 151         return s5m_reg_update(s5m87xx, S5M8767_REG_CTRL1,
 152                               S5M8767_LOW_JITTER_MASK,
 153                               S5M8767_LOW_JITTER_MASK);
 154 }
 155
 156 static int __devinit s5m87xx_i2c_probe(struct i2c_client *i2c,
 157                                        const struct i2c_device_id *id)
 158 {
 159         struct s5m_platform_data *pdata = i2c->dev.platform_data;
 160         struct s5m87xx_dev *s5m87xx;
 161         int ret;
 162
 163         s5m87xx = devm_kzalloc(&i2c->dev, sizeof(struct s5m87xx_dev),
 164                                 GFP_KERNEL);
 165         if (s5m87xx == NULL)
 166                 return -ENOMEM;
 167
 168         i2c_set_clientdata(i2c, s5m87xx);
 169         s5m87xx->dev = &i2c->dev;
 170         s5m87xx->i2c = i2c;
 171         s5m87xx->irq = i2c->irq;
 172         s5m87xx->type = s5m87xx_i2c_get_driver_data(i2c, id);
 173
 174         if (s5m87xx->dev->of_node) {
 175                 pdata = s5m87xx_i2c_parse_dt_pdata(s5m87xx->dev);
 176                 if (IS_ERR(pdata)) {
 177                         ret = PTR_ERR(pdata);
 178                         goto err;
 179                 }
 180         }
 181         s5m87xx->pdata = pdata;
 182
 183         if (!pdata) {
 184                 ret = -ENODEV;
 185                 dev_warn(s5m87xx->dev, "No platform data found\n");
 186                 goto err;
 187         }
 188
 189         s5m87xx->device_type = pdata->device_type;
 190         /* TODO(tbroch): address whether we want this addtional interrupt node
 191            and add it to DT parsing if yes.
 192         */
 193         s5m87xx->ono = pdata->ono;
 194         /* TODO(tbroch): remove hack below and parse irq_base via DT */
 195         s5m87xx->irq_base = pdata->irq_base = MAX77686_IRQ_BASE;
 196 #ifdef OF_CONFIG
 197         s5m87xx->wakeup = i2c->flags & I2C_CLIENT_WAKE;
 198 #else
 199         s5m87xx->wakeup = pdata->wakeup;
 200 #endif
 201
 202         s5m87xx->regmap = regmap_init_i2c(i2c, &s5m_regmap_config);
 203         if (IS_ERR(s5m87xx->regmap)) {
 204                 ret = PTR_ERR(s5m87xx->regmap);
 205                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
 206                         ret);
 207                 goto err;
 208         }
 209
 210         s5m87xx->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
 211         i2c_set_clientdata(s5m87xx->rtc, s5m87xx);
 212
 213         if (pdata && pdata->cfg_pmic_irq)
 214                 pdata->cfg_pmic_irq();
 215
 216         s5m_irq_init(s5m87xx);
 217
 218         pm_runtime_set_active(s5m87xx->dev);
 219
 220         switch (s5m87xx->device_type) {
 221         case S5M8751X:
 222                 ret = mfd_add_devices(s5m87xx->dev, -1, s5m8751_devs,
 223                                       ARRAY_SIZE(s5m8751_devs), NULL, 0);
 224                 break;
 225         case S5M8763X:
 226                 ret = mfd_add_devices(s5m87xx->dev, -1, s5m8763_devs,
 227                                       ARRAY_SIZE(s5m8763_devs), NULL, 0);
 228                 break;
 229         case S5M8767X:
 230                 ret = mfd_add_devices(s5m87xx->dev, -1, s5m8767_devs,
 231                                       ARRAY_SIZE(s5m8767_devs), NULL, 0);
 232                 break;
 233         default:
 234                 /* If this happens the probe function is problem */
 235                 BUG();
 236         }
 237
 238         if (ret < 0)
 239                 goto err;
 240
 241         if (s5m87xx_set_low_jitter(s5m87xx) < 0) {
 242                 dev_err(s5m87xx->dev, "failed to configure low-jitter\n");
 243                 ret = -EIO;
 244                 goto err;
 245         }
 246
 247         return ret;
 248
 249 err:
 250         mfd_remove_devices(s5m87xx->dev);
 251         s5m_irq_exit(s5m87xx);
 252         i2c_unregister_device(s5m87xx->rtc);
 253         regmap_exit(s5m87xx->regmap);
 254         return ret;
 255 }
 256
 257 static int s5m87xx_i2c_remove(struct i2c_client *i2c)
 258 {
 259         struct s5m87xx_dev *s5m87xx = i2c_get_clientdata(i2c);
 260
 261         mfd_remove_devices(s5m87xx->dev);
 262         s5m_irq_exit(s5m87xx);
 263         i2c_unregister_device(s5m87xx->rtc);
 264         regmap_exit(s5m87xx->regmap);
 265         return 0;
 266 }
 267
 268 static const struct i2c_device_id s5m87xx_i2c_id[] = {
 269         { "s5m87xx", 0 },
 270         { }
 271 };
 272 MODULE_DEVICE_TABLE(i2c, s5m87xx_i2c_id);
 273
 274 static struct i2c_driver s5m87xx_i2c_driver = {
 275         .driver = {
 276                    .name = "s5m87xx",
 277                    .owner = THIS_MODULE,
 278                    .of_match_table = of_match_ptr(s5m87xx_pmic_dt_match),
 279         },
 280         .probe = s5m87xx_i2c_probe,
 281         .remove = s5m87xx_i2c_remove,
 282         .id_table = s5m87xx_i2c_id,
 283 };
 284
 285 static int __init s5m87xx_i2c_init(void)
 286 {
 287         return i2c_add_driver(&s5m87xx_i2c_driver);
 288 }
 289
 290 subsys_initcall(s5m87xx_i2c_init);
 291
 292 static void __exit s5m87xx_i2c_exit(void)
 293 {
 294         i2c_del_driver(&s5m87xx_i2c_driver);
 295 }
 296 module_exit(s5m87xx_i2c_exit);
 297
 298 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 299 MODULE_DESCRIPTION("Core support for the S5M MFD");
 300 MODULE_LICENSE("GPL");