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 static struct regmap_config s5m_regmap_config = {
  65         .reg_bits = 8,
  66         .val_bits = 8,
  67 };
  68
  69 static inline int s5m87xx_i2c_get_driver_data(struct i2c_client *i2c,
  70                                                const struct i2c_device_id *id)
  71 {
  72 #ifdef CONFIG_OF
  73         if (i2c->dev.of_node) {
  74                 const struct of_device_id *match;
  75                 match = of_match_node(s5m87xx_pmic_dt_match, i2c->dev.of_node);
  76                 return (int)match->data;
  77         }
  78 #endif
  79         return (int)id->driver_data;
  80 }
  81
  82 #ifdef CONFIG_OF
  83 static struct s5m_platform_data *s5m87xx_i2c_parse_dt_pdata(struct device *dev)
  84 {
  85         struct s5m_platform_data *pd;
  86
  87         pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
  88         if (!pd) {
  89                 dev_err(dev, "could not allocate memory for pdata\n");
  90                 return ERR_PTR(-ENOMEM);
  91         }
  92
  93         if (of_property_read_u32(dev->of_node, "s5m-core,device_type",
  94                                  &pd->device_type)) {
  95                 dev_warn(dev, "no OF device_type property");
  96         }
  97         dev_dbg(dev, "OF device_type property = %u", pd->device_type);
  98
  99         if (of_get_property(dev->of_node, "s5m-core,enable-low-jitter", NULL)) {
 100                 if (!(pd->device_type == S5M8767X))
 101                         dev_warn(dev, "no low-jitter for this PMIC type\n");
 102                 else
 103                         pd->low_jitter = true;
 104         }
 105         dev_dbg(dev, "OF low-jitter property: %u\n", pd->low_jitter);
 106
 107         return pd;
 108 }
 109 #else
 110 static struct s5m_platform_data *s5m87xx_i2c_parse_dt_pdata(struct device *dev)
 111 {
 112         return 0;
 113 }
 114 #endif
 115
 116 static int s5m87xx_set_low_jitter(struct s5m87xx_dev *s5m87xx)
 117 {
 118         if (!s5m87xx->pdata->low_jitter)
 119                 return 0;
 120
 121         return regmap_update_bits(s5m87xx->pmic, S5M8767_REG_CTRL1,
 122                                   S5M8767_LOW_JITTER_MASK,
 123                                   S5M8767_LOW_JITTER_MASK);
 124 }
 125
 126 static int __devinit s5m87xx_i2c_probe(struct i2c_client *i2c,
 127                                        const struct i2c_device_id *id)
 128 {
 129         struct s5m_platform_data *pdata = i2c->dev.platform_data;
 130         struct s5m87xx_dev *s5m87xx;
 131         struct i2c_client *rtc_i2c = NULL;
 132         int ret;
 133
 134         s5m87xx = devm_kzalloc(&i2c->dev, sizeof(struct s5m87xx_dev),
 135                                 GFP_KERNEL);
 136         if (s5m87xx == NULL)
 137                 return -ENOMEM;
 138
 139         i2c_set_clientdata(i2c, s5m87xx);
 140         s5m87xx->dev = &i2c->dev;
 141         s5m87xx->irq = i2c->irq;
 142         s5m87xx->type = s5m87xx_i2c_get_driver_data(i2c, id);
 143
 144         if (s5m87xx->dev->of_node) {
 145                 pdata = s5m87xx_i2c_parse_dt_pdata(s5m87xx->dev);
 146                 if (IS_ERR(pdata)) {
 147                         ret = PTR_ERR(pdata);
 148                         goto err;
 149                 }
 150         }
 151         s5m87xx->pdata = pdata;
 152
 153         if (!pdata) {
 154                 ret = -ENODEV;
 155                 dev_warn(s5m87xx->dev, "No platform data found\n");
 156                 goto err;
 157         }
 158
 159         s5m87xx->device_type = pdata->device_type;
 160         /* TODO(tbroch): address whether we want this addtional interrupt node
 161            and add it to DT parsing if yes.
 162         */
 163         s5m87xx->ono = pdata->ono;
 164         /* TODO(tbroch): remove hack below and parse irq_base via DT */
 165         s5m87xx->irq_base = pdata->irq_base = MAX77686_IRQ_BASE;
 166 #ifdef OF_CONFIG
 167         s5m87xx->wakeup = i2c->flags & I2C_CLIENT_WAKE;
 168 #else
 169         s5m87xx->wakeup = pdata->wakeup;
 170 #endif
 171
 172         s5m87xx->pmic = regmap_init_i2c(i2c, &s5m_regmap_config);
 173         if (IS_ERR(s5m87xx->pmic)) {
 174                 ret = PTR_ERR(s5m87xx->pmic);
 175                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
 176                         ret);
 177                 goto err;
 178         }
 179
 180         rtc_i2c = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
 181         i2c_set_clientdata(rtc_i2c, s5m87xx);
 182         s5m87xx->rtc = regmap_init_i2c(rtc_i2c, &s5m_regmap_config);
 183         if (IS_ERR(s5m87xx->rtc)) {
 184                 ret = PTR_ERR(s5m87xx->rtc);
 185                 dev_err(&rtc_i2c->dev, "Failed to allocate register map: %d\n",
 186                         ret);
 187                 goto err;
 188         }
 189
 190         if (pdata && pdata->cfg_pmic_irq)
 191                 pdata->cfg_pmic_irq();
 192
 193         s5m_irq_init(s5m87xx);
 194
 195         pm_runtime_set_active(s5m87xx->dev);
 196
 197         switch (s5m87xx->device_type) {
 198         case S5M8751X:
 199                 ret = mfd_add_devices(s5m87xx->dev, -1, s5m8751_devs,
 200                                       ARRAY_SIZE(s5m8751_devs), NULL, 0);
 201                 break;
 202         case S5M8763X:
 203                 ret = mfd_add_devices(s5m87xx->dev, -1, s5m8763_devs,
 204                                       ARRAY_SIZE(s5m8763_devs), NULL, 0);
 205                 break;
 206         case S5M8767X:
 207                 ret = mfd_add_devices(s5m87xx->dev, -1, s5m8767_devs,
 208                                       ARRAY_SIZE(s5m8767_devs), NULL, 0);
 209                 break;
 210         default:
 211                 /* If this happens the probe function is problem */
 212                 BUG();
 213         }
 214
 215         if (ret < 0)
 216                 goto err;
 217
 218         if (s5m87xx_set_low_jitter(s5m87xx) < 0) {
 219                 dev_err(s5m87xx->dev, "failed to configure low-jitter\n");
 220                 ret = -EIO;
 221                 goto err;
 222         }
 223
 224         return ret;
 225
 226 err:
 227         mfd_remove_devices(s5m87xx->dev);
 228         s5m_irq_exit(s5m87xx);
 229         if (rtc_i2c)
 230                 i2c_unregister_device(rtc_i2c);
 231         regmap_exit(s5m87xx->pmic);
 232         regmap_exit(s5m87xx->rtc);
 233         return ret;
 234 }
 235
 236 static int s5m87xx_i2c_remove(struct i2c_client *i2c)
 237 {
 238         struct s5m87xx_dev *s5m87xx = i2c_get_clientdata(i2c);
 239
 240         device_init_wakeup(s5m87xx->dev, 0);
 241         pm_runtime_set_suspended(s5m87xx->dev);
 242         mfd_remove_devices(s5m87xx->dev);
 243         s5m_irq_exit(s5m87xx);
 244         regmap_exit(s5m87xx->pmic);
 245         regmap_exit(s5m87xx->rtc);
 246         return 0;
 247 }
 248
 249 static const struct i2c_device_id s5m87xx_i2c_id[] = {
 250         { "s5m87xx", 0 },
 251         { }
 252 };
 253 MODULE_DEVICE_TABLE(i2c, s5m87xx_i2c_id);
 254
 255 #ifdef CONFIG_PM
 256 static int s5m87xx_suspend(struct device *dev)
 257 {
 258         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 259         struct s5m87xx_dev *s5m87xx = i2c_get_clientdata(i2c);
 260
 261         if (device_may_wakeup(dev))
 262                 enable_irq_wake(s5m87xx->irq);
 263
 264         return 0;
 265 }
 266
 267 static int s5m87xx_resume(struct device *dev)
 268 {
 269         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 270         struct s5m87xx_dev *s5m87xx = i2c_get_clientdata(i2c);
 271
 272         if (device_may_wakeup(dev))
 273                 disable_irq_wake(s5m87xx->irq);
 274
 275         s5m_irq_resume(s5m87xx);
 276         return 0;
 277 }
 278
 279 const struct dev_pm_ops s5m87xx_pm = {
 280         .suspend = s5m87xx_suspend,
 281         .resume = s5m87xx_resume,
 282 };
 283 #endif
 284
 285 static struct i2c_driver s5m87xx_i2c_driver = {
 286         .driver = {
 287                    .name = "s5m87xx",
 288                    .owner = THIS_MODULE,
 289 #ifdef CONFIG_PM
 290                    .pm = &s5m87xx_pm,
 291 #endif
 292                    .of_match_table = of_match_ptr(s5m87xx_pmic_dt_match),
 293         },
 294         .probe = s5m87xx_i2c_probe,
 295         .remove = s5m87xx_i2c_remove,
 296         .id_table = s5m87xx_i2c_id,
 297 };
 298
 299 static int __init s5m87xx_i2c_init(void)
 300 {
 301         return i2c_add_driver(&s5m87xx_i2c_driver);
 302 }
 303
 304 subsys_initcall(s5m87xx_i2c_init);
 305
 306 static void __exit s5m87xx_i2c_exit(void)
 307 {
 308         i2c_del_driver(&s5m87xx_i2c_driver);
 309 }
 310 module_exit(s5m87xx_i2c_exit);
 311
 312 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 313 MODULE_DESCRIPTION("Core support for the S5M MFD");
 314 MODULE_LICENSE("GPL");