drivers/mfd/s2mpb02-core.c

   1 /*
   2  * s2mpb02-core.c - mfd core driver for the Samsung s2mpb02
   3  *
   4  * Copyright (C) 2014 Samsung Electronics
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  * This driver is based on max77804.c
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/slab.h>
  25 #include <linux/i2c.h>
  26 #include <linux/irq.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/mutex.h>
  29 #include <linux/mfd/core.h>
  30 #include <linux/mfd/s2mpb02.h>
  31 #include <linux/mfd/s2mpb02-regulator.h>
  32 #include <linux/regulator/machine.h>
  33
  34 #ifdef  CONFIG_OF
  35 #include <linux/of_device.h>
  36 #include <linux/of_gpio.h>
  37 #endif /* CONFIG_OF */
  38
  39 static struct mfd_cell s2mpb02_devs[] = {
  40 #ifdef  CONFIG_LEDS_S2MPB02
  41         { .name = "s2mpb02-led", },
  42 #endif /* CONFIG_LEDS_S2MPB02 */
  43         { .name = "s2mpb02-regulator", },
  44 };
  45
  46 int s2mpb02_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
  47 {
  48         struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c);
  49         int ret;
  50
  51         mutex_lock(&s2mpb02->i2c_lock);
  52         ret = i2c_smbus_read_byte_data(i2c, reg);
  53         mutex_unlock(&s2mpb02->i2c_lock);
  54         if (ret < 0) {
  55                 pr_info("%s:%s reg(0x%x), ret(%d)\n",
  56                                 MFD_DEV_NAME, __func__, reg, ret);
  57                 return ret;
  58         }
  59
  60         ret &= 0xff;
  61         *dest = ret;
  62         return 0;
  63 }
  64 EXPORT_SYMBOL_GPL(s2mpb02_read_reg);
  65
  66 int s2mpb02_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
  67 {
  68         struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c);
  69         int ret;
  70
  71         mutex_lock(&s2mpb02->i2c_lock);
  72         ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
  73         mutex_unlock(&s2mpb02->i2c_lock);
  74         if (ret < 0)
  75                 return ret;
  76
  77         return 0;
  78 }
  79 EXPORT_SYMBOL_GPL(s2mpb02_bulk_read);
  80
  81 int s2mpb02_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
  82 {
  83         struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c);
  84         int ret;
  85
  86         mutex_lock(&s2mpb02->i2c_lock);
  87         ret = i2c_smbus_write_byte_data(i2c, reg, value);
  88         mutex_unlock(&s2mpb02->i2c_lock);
  89         if (ret < 0)
  90                 pr_info("%s:%s reg(0x%x), ret(%d)\n",
  91                                 MFD_DEV_NAME, __func__, reg, ret);
  92
  93         return ret;
  94 }
  95 EXPORT_SYMBOL_GPL(s2mpb02_write_reg);
  96
  97 int s2mpb02_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
  98 {
  99         struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c);
 100         int ret;
 101
 102         mutex_lock(&s2mpb02->i2c_lock);
 103         ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
 104         mutex_unlock(&s2mpb02->i2c_lock);
 105         if (ret < 0)
 106                 return ret;
 107
 108         return 0;
 109 }
 110 EXPORT_SYMBOL_GPL(s2mpb02_bulk_write);
 111
 112 int s2mpb02_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
 113 {
 114         struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c);
 115         int ret;
 116
 117         mutex_lock(&s2mpb02->i2c_lock);
 118         ret = i2c_smbus_read_byte_data(i2c, reg);
 119         if (ret >= 0) {
 120                 u8 old_val = ret & 0xff;
 121                 u8 new_val = (val & mask) | (old_val & (~mask));
 122                 ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
 123         }
 124         mutex_unlock(&s2mpb02->i2c_lock);
 125         return ret;
 126 }
 127 EXPORT_SYMBOL_GPL(s2mpb02_update_reg);
 128
 129 #ifdef  CONFIG_OF
 130 static int of_s2mpb02_dt(struct device *dev,
 131                 struct s2mpb02_platform_data *pdata)
 132 {
 133         struct device_node *np_s2mpb02 = dev->of_node;
 134
 135         if (!np_s2mpb02)
 136                 return -EINVAL;
 137
 138         pdata->wakeup = of_property_read_bool(np_s2mpb02, "s2mpb02,wakeup");
 139
 140         return 0;
 141 }
 142 #else
 143 static int of_s2mpb02_dt(struct device *dev,
 144                 struct s2mpb02_platform_data *pdata)
 145 {
 146         return 0;
 147 }
 148 #endif /* CONFIG_OF */
 149
 150 static int s2mpb02_i2c_probe(struct i2c_client *i2c,
 151                                 const struct i2c_device_id *dev_id)
 152 {
 153         struct s2mpb02_dev *s2mpb02;
 154         struct s2mpb02_platform_data *pdata = i2c->dev.platform_data;
 155
 156         int ret = 0;
 157         u8 reg_data;
 158
 159         pr_info("%s:%s\n", MFD_DEV_NAME, __func__);
 160
 161         s2mpb02 = kzalloc(sizeof(struct s2mpb02_dev), GFP_KERNEL);
 162         if (!s2mpb02) {
 163                 dev_err(&i2c->dev, "%s: Failed to alloc mem for s2mpb02\n",
 164                                                         __func__);
 165                 return -ENOMEM;
 166         }
 167
 168         if (i2c->dev.of_node) {
 169                 pdata = devm_kzalloc(&i2c->dev,
 170                         sizeof(struct s2mpb02_platform_data), GFP_KERNEL);
 171                 if (!pdata) {
 172                         dev_err(&i2c->dev, "Failed to allocate memory\n");
 173                         ret = -ENOMEM;
 174                         goto err_pdata;
 175                 }
 176
 177                 ret = of_s2mpb02_dt(&i2c->dev, pdata);
 178                 if (ret < 0) {
 179                         dev_err(&i2c->dev, "Failed to get device of_node\n");
 180                         goto err;
 181                 }
 182
 183                 i2c->dev.platform_data = pdata;
 184         } else
 185                 pdata = i2c->dev.platform_data;
 186
 187         s2mpb02->dev = &i2c->dev;
 188         s2mpb02->i2c = i2c;
 189         s2mpb02->irq = i2c->irq;
 190         if (pdata) {
 191                 s2mpb02->pdata = pdata;
 192
 193                 pdata->irq_base = irq_alloc_descs(-1, 600, S2MPB02_IRQ_NR, 0);
 194                 if (pdata->irq_base < 0) {
 195                         pr_err("%s:%s irq_alloc_descs Fail! ret(%d)\n",
 196                                 MFD_DEV_NAME, __func__, pdata->irq_base);
 197                         ret = -EINVAL;
 198                         goto err;
 199                 } else {
 200                         s2mpb02->irq_base = pdata->irq_base;
 201                 }
 202
 203                 s2mpb02->wakeup = pdata->wakeup;
 204         } else {
 205                 ret = -EINVAL;
 206                 goto err;
 207         }
 208         mutex_init(&s2mpb02->i2c_lock);
 209
 210         i2c_set_clientdata(i2c, s2mpb02);
 211
 212         if (s2mpb02_read_reg(s2mpb02->i2c,
 213                         S2MPB02_REG_BST_CTRL2, &reg_data) < 0) {
 214                 pr_err("device not found on this channel!!\n");
 215                 ret = -ENODEV;
 216         } else {
 217                 if (reg_data == 0x90) {
 218                         S2MPB02_PMIC_REV(s2mpb02) = 1;
 219                 } else
 220                         S2MPB02_PMIC_REV(s2mpb02) = 0;
 221                 pr_info("%s: device id 0x%x is found\n",
 222                                 __func__, s2mpb02->rev_num);
 223         }
 224
 225         ret = s2mpb02_irq_init(s2mpb02);
 226         if (ret < 0)
 227                 goto err_irq_init;
 228
 229         ret = mfd_add_devices(s2mpb02->dev, -1, s2mpb02_devs,
 230                         ARRAY_SIZE(s2mpb02_devs), NULL, 0, NULL);
 231         if (ret < 0)
 232                 goto err_irq_init;
 233
 234         device_init_wakeup(s2mpb02->dev, pdata->wakeup);
 235
 236         return ret;
 237
 238 err_irq_init:
 239         mutex_destroy(&s2mpb02->i2c_lock);
 240 err:
 241         kfree(pdata);
 242         s2mpb02_irq_exit(s2mpb02);
 243 err_pdata:
 244         kfree(s2mpb02);
 245
 246         return ret;
 247 }
 248
 249 static int s2mpb02_i2c_remove(struct i2c_client *i2c)
 250 {
 251         struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c);
 252
 253         mfd_remove_devices(s2mpb02->dev);
 254         s2mpb02_irq_exit(s2mpb02);
 255         mutex_destroy(&s2mpb02->i2c_lock);
 256         kfree(s2mpb02);
 257
 258         return 0;
 259 }
 260
 261 static const struct i2c_device_id s2mpb02_i2c_id[] = {
 262         { MFD_DEV_NAME, TYPE_S2MPB02 },
 263         { }
 264 };
 265 MODULE_DEVICE_TABLE(i2c, s2mpb02_i2c_id);
 266
 267 #if defined(CONFIG_OF)
 268 static struct of_device_id s2mpb02_i2c_dt_ids[] = {
 269         { .compatible = "s2mpb02,s2mpb02mfd" },
 270         {},
 271 };
 272 MODULE_DEVICE_TABLE(of, s2mpb02_i2c_dt_ids);
 273 #endif /* CONFIG_OF */
 274
 275 #if defined(CONFIG_PM)
 276 static int s2mpb02_suspend(struct device *dev)
 277 {
 278         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 279         struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c);
 280
 281         if (device_may_wakeup(dev))
 282                 enable_irq_wake(s2mpb02->irq);
 283
 284         disable_irq(s2mpb02->irq);
 285
 286         return 0;
 287 }
 288
 289 static int s2mpb02_resume(struct device *dev)
 290 {
 291         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 292         struct s2mpb02_dev *s2mpb02 = i2c_get_clientdata(i2c);
 293
 294         if (device_may_wakeup(dev))
 295                 disable_irq_wake(s2mpb02->irq);
 296
 297         enable_irq(s2mpb02->irq);
 298
 299         return 0;
 300 }
 301 #else
 302 #define s2mpb02_suspend NULL
 303 #define s2mpb02_resume  NULL
 304 #endif /* CONFIG_PM */
 305
 306 const struct dev_pm_ops s2mpb02_pm = {
 307         .suspend = s2mpb02_suspend,
 308         .resume = s2mpb02_resume,
 309 };
 310
 311 static struct i2c_driver s2mpb02_i2c_driver = {
 312         .driver         = {
 313                 .name   = MFD_DEV_NAME,
 314                 .owner  = THIS_MODULE,
 315 #if defined(CONFIG_PM)
 316                 .pm     = &s2mpb02_pm,
 317 #endif /* CONFIG_PM */
 318 #if defined(CONFIG_OF)
 319                 .of_match_table = s2mpb02_i2c_dt_ids,
 320 #endif /* CONFIG_OF */
 321                 .suppress_bind_attrs = true,
 322         },
 323         .probe          = s2mpb02_i2c_probe,
 324         .remove         = s2mpb02_i2c_remove,
 325         .id_table       = s2mpb02_i2c_id,
 326 };
 327
 328 static int __init s2mpb02_i2c_init(void)
 329 {
 330         pr_info("%s:%s\n", MFD_DEV_NAME, __func__);
 331         return i2c_add_driver(&s2mpb02_i2c_driver);
 332 }
 333 /* init early so consumer devices can complete system boot */
 334 subsys_initcall(s2mpb02_i2c_init);
 335
 336 static void __exit s2mpb02_i2c_exit(void)
 337 {
 338         i2c_del_driver(&s2mpb02_i2c_driver);
 339 }
 340 module_exit(s2mpb02_i2c_exit);
 341
 342 MODULE_DESCRIPTION("SAMSUNG s2mpb02 multi-function core driver");
 343 MODULE_LICENSE("GPL");