drivers/mfd/adp5520.c

   1 /*
   2  * Base driver for Analog Devices ADP5520/ADP5501 MFD PMICs
   3  * LCD Backlight: drivers/video/backlight/adp5520_bl
   4  * LEDs         : drivers/led/leds-adp5520
   5  * GPIO         : drivers/gpio/adp5520-gpio (ADP5520 only)
   6  * Keys         : drivers/input/keyboard/adp5520-keys (ADP5520 only)
   7  *
   8  * Copyright 2009 Analog Devices Inc.
   9  *
  10  * Derived from da903x:
  11  * Copyright (C) 2008 Compulab, Ltd.
  12  *      Mike Rapoport <mike@compulab.co.il>
  13  *
  14  * Copyright (C) 2006-2008 Marvell International Ltd.
  15  *      Eric Miao <eric.miao@marvell.com>
  16  *
  17  * Licensed under the GPL-2 or later.
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/slab.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/irq.h>
  26 #include <linux/err.h>
  27 #include <linux/i2c.h>
  28
  29 #include <linux/mfd/adp5520.h>
  30
  31 struct adp5520_chip {
  32         struct i2c_client *client;
  33         struct device *dev;
  34         struct mutex lock;
  35         struct blocking_notifier_head notifier_list;
  36         int irq;
  37         unsigned long id;
  38         uint8_t mode;
  39 };
  40
  41 static int __adp5520_read(struct i2c_client *client,
  42                                 int reg, uint8_t *val)
  43 {
  44         int ret;
  45
  46         ret = i2c_smbus_read_byte_data(client, reg);
  47         if (ret < 0) {
  48                 dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
  49                 return ret;
  50         }
  51
  52         *val = (uint8_t)ret;
  53         return 0;
  54 }
  55
  56 static int __adp5520_write(struct i2c_client *client,
  57                                  int reg, uint8_t val)
  58 {
  59         int ret;
  60
  61         ret = i2c_smbus_write_byte_data(client, reg, val);
  62         if (ret < 0) {
  63                 dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
  64                                 val, reg);
  65                 return ret;
  66         }
  67         return 0;
  68 }
  69
  70 static int __adp5520_ack_bits(struct i2c_client *client, int reg,
  71                               uint8_t bit_mask)
  72 {
  73         struct adp5520_chip *chip = i2c_get_clientdata(client);
  74         uint8_t reg_val;
  75         int ret;
  76
  77         mutex_lock(&chip->lock);
  78
  79         ret = __adp5520_read(client, reg, &reg_val);
  80
  81         if (!ret) {
  82                 reg_val |= bit_mask;
  83                 ret = __adp5520_write(client, reg, reg_val);
  84         }
  85
  86         mutex_unlock(&chip->lock);
  87         return ret;
  88 }
  89
  90 int adp5520_write(struct device *dev, int reg, uint8_t val)
  91 {
  92         return __adp5520_write(to_i2c_client(dev), reg, val);
  93 }
  94 EXPORT_SYMBOL_GPL(adp5520_write);
  95
  96 int adp5520_read(struct device *dev, int reg, uint8_t *val)
  97 {
  98         return __adp5520_read(to_i2c_client(dev), reg, val);
  99 }
 100 EXPORT_SYMBOL_GPL(adp5520_read);
 101
 102 int adp5520_set_bits(struct device *dev, int reg, uint8_t bit_mask)
 103 {
 104         struct adp5520_chip *chip = dev_get_drvdata(dev);
 105         uint8_t reg_val;
 106         int ret;
 107
 108         mutex_lock(&chip->lock);
 109
 110         ret = __adp5520_read(chip->client, reg, &reg_val);
 111
 112         if (!ret && ((reg_val & bit_mask) != bit_mask)) {
 113                 reg_val |= bit_mask;
 114                 ret = __adp5520_write(chip->client, reg, reg_val);
 115         }
 116
 117         mutex_unlock(&chip->lock);
 118         return ret;
 119 }
 120 EXPORT_SYMBOL_GPL(adp5520_set_bits);
 121
 122 int adp5520_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
 123 {
 124         struct adp5520_chip *chip = dev_get_drvdata(dev);
 125         uint8_t reg_val;
 126         int ret;
 127
 128         mutex_lock(&chip->lock);
 129
 130         ret = __adp5520_read(chip->client, reg, &reg_val);
 131
 132         if (!ret && (reg_val & bit_mask)) {
 133                 reg_val &= ~bit_mask;
 134                 ret = __adp5520_write(chip->client, reg, reg_val);
 135         }
 136
 137         mutex_unlock(&chip->lock);
 138         return ret;
 139 }
 140 EXPORT_SYMBOL_GPL(adp5520_clr_bits);
 141
 142 int adp5520_register_notifier(struct device *dev, struct notifier_block *nb,
 143                                 unsigned int events)
 144 {
 145         struct adp5520_chip *chip = dev_get_drvdata(dev);
 146
 147         if (chip->irq) {
 148                 adp5520_set_bits(chip->dev, ADP5520_INTERRUPT_ENABLE,
 149                         events & (ADP5520_KP_IEN | ADP5520_KR_IEN |
 150                         ADP5520_OVP_IEN | ADP5520_CMPR_IEN));
 151
 152                 return blocking_notifier_chain_register(&chip->notifier_list,
 153                          nb);
 154         }
 155
 156         return -ENODEV;
 157 }
 158 EXPORT_SYMBOL_GPL(adp5520_register_notifier);
 159
 160 int adp5520_unregister_notifier(struct device *dev, struct notifier_block *nb,
 161                                 unsigned int events)
 162 {
 163         struct adp5520_chip *chip = dev_get_drvdata(dev);
 164
 165         adp5520_clr_bits(chip->dev, ADP5520_INTERRUPT_ENABLE,
 166                 events & (ADP5520_KP_IEN | ADP5520_KR_IEN |
 167                 ADP5520_OVP_IEN | ADP5520_CMPR_IEN));
 168
 169         return blocking_notifier_chain_unregister(&chip->notifier_list, nb);
 170 }
 171 EXPORT_SYMBOL_GPL(adp5520_unregister_notifier);
 172
 173 static irqreturn_t adp5520_irq_thread(int irq, void *data)
 174 {
 175         struct adp5520_chip *chip = data;
 176         unsigned int events;
 177         uint8_t reg_val;
 178         int ret;
 179
 180         ret = __adp5520_read(chip->client, ADP5520_MODE_STATUS, &reg_val);
 181         if (ret)
 182                 goto out;
 183
 184         events =  reg_val & (ADP5520_OVP_INT | ADP5520_CMPR_INT |
 185                 ADP5520_GPI_INT | ADP5520_KR_INT | ADP5520_KP_INT);
 186
 187         blocking_notifier_call_chain(&chip->notifier_list, events, NULL);
 188         /* ACK, Sticky bits are W1C */
 189         __adp5520_ack_bits(chip->client, ADP5520_MODE_STATUS, events);
 190
 191 out:
 192         return IRQ_HANDLED;
 193 }
 194
 195 static int __remove_subdev(struct device *dev, void *unused)
 196 {
 197         platform_device_unregister(to_platform_device(dev));
 198         return 0;
 199 }
 200
 201 static int adp5520_remove_subdevs(struct adp5520_chip *chip)
 202 {
 203         return device_for_each_child(chip->dev, NULL, __remove_subdev);
 204 }
 205
 206 static int adp5520_probe(struct i2c_client *client,
 207                                         const struct i2c_device_id *id)
 208 {
 209         struct adp5520_platform_data *pdata = dev_get_platdata(&client->dev);
 210         struct platform_device *pdev;
 211         struct adp5520_chip *chip;
 212         int ret;
 213
 214         if (!i2c_check_functionality(client->adapter,
 215                                         I2C_FUNC_SMBUS_BYTE_DATA)) {
 216                 dev_err(&client->dev, "SMBUS Word Data not Supported\n");
 217                 return -EIO;
 218         }
 219
 220         if (pdata == NULL) {
 221                 dev_err(&client->dev, "missing platform data\n");
 222                 return -ENODEV;
 223         }
 224
 225         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 226         if (!chip)
 227                 return -ENOMEM;
 228
 229         i2c_set_clientdata(client, chip);
 230         chip->client = client;
 231
 232         chip->dev = &client->dev;
 233         chip->irq = client->irq;
 234         chip->id = id->driver_data;
 235         mutex_init(&chip->lock);
 236
 237         if (chip->irq) {
 238                 BLOCKING_INIT_NOTIFIER_HEAD(&chip->notifier_list);
 239
 240                 ret = request_threaded_irq(chip->irq, NULL, adp5520_irq_thread,
 241                                 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 242                                 "adp5520", chip);
 243                 if (ret) {
 244                         dev_err(&client->dev, "failed to request irq %d\n",
 245                                         chip->irq);
 246                         return ret;
 247                 }
 248         }
 249
 250         ret = adp5520_write(chip->dev, ADP5520_MODE_STATUS, ADP5520_nSTNBY);
 251         if (ret) {
 252                 dev_err(&client->dev, "failed to write\n");
 253                 goto out_free_irq;
 254         }
 255
 256         if (pdata->keys) {
 257                 pdev = platform_device_register_data(chip->dev, "adp5520-keys",
 258                                 chip->id, pdata->keys, sizeof(*pdata->keys));
 259                 if (IS_ERR(pdev)) {
 260                         ret = PTR_ERR(pdev);
 261                         goto out_remove_subdevs;
 262                 }
 263         }
 264
 265         if (pdata->gpio) {
 266                 pdev = platform_device_register_data(chip->dev, "adp5520-gpio",
 267                                 chip->id, pdata->gpio, sizeof(*pdata->gpio));
 268                 if (IS_ERR(pdev)) {
 269                         ret = PTR_ERR(pdev);
 270                         goto out_remove_subdevs;
 271                 }
 272         }
 273
 274         if (pdata->leds) {
 275                 pdev = platform_device_register_data(chip->dev, "adp5520-led",
 276                                 chip->id, pdata->leds, sizeof(*pdata->leds));
 277                 if (IS_ERR(pdev)) {
 278                         ret = PTR_ERR(pdev);
 279                         goto out_remove_subdevs;
 280                 }
 281         }
 282
 283         if (pdata->backlight) {
 284                 pdev = platform_device_register_data(chip->dev,
 285                                                 "adp5520-backlight",
 286                                                 chip->id,
 287                                                 pdata->backlight,
 288                                                 sizeof(*pdata->backlight));
 289                 if (IS_ERR(pdev)) {
 290                         ret = PTR_ERR(pdev);
 291                         goto out_remove_subdevs;
 292                 }
 293         }
 294
 295         return 0;
 296
 297 out_remove_subdevs:
 298         adp5520_remove_subdevs(chip);
 299
 300 out_free_irq:
 301         if (chip->irq)
 302                 free_irq(chip->irq, chip);
 303
 304         return ret;
 305 }
 306
 307 static int adp5520_remove(struct i2c_client *client)
 308 {
 309         struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
 310
 311         if (chip->irq)
 312                 free_irq(chip->irq, chip);
 313
 314         adp5520_remove_subdevs(chip);
 315         adp5520_write(chip->dev, ADP5520_MODE_STATUS, 0);
 316         return 0;
 317 }
 318
 319 #ifdef CONFIG_PM_SLEEP
 320 static int adp5520_suspend(struct device *dev)
 321 {
 322         struct i2c_client *client = to_i2c_client(dev);
 323         struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
 324
 325         adp5520_read(chip->dev, ADP5520_MODE_STATUS, &chip->mode);
 326         /* All other bits are W1C */
 327         chip->mode &= ADP5520_BL_EN | ADP5520_DIM_EN | ADP5520_nSTNBY;
 328         adp5520_write(chip->dev, ADP5520_MODE_STATUS, 0);
 329         return 0;
 330 }
 331
 332 static int adp5520_resume(struct device *dev)
 333 {
 334         struct i2c_client *client = to_i2c_client(dev);
 335         struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
 336
 337         adp5520_write(chip->dev, ADP5520_MODE_STATUS, chip->mode);
 338         return 0;
 339 }
 340 #endif
 341
 342 static SIMPLE_DEV_PM_OPS(adp5520_pm, adp5520_suspend, adp5520_resume);
 343
 344 static const struct i2c_device_id adp5520_id[] = {
 345         { "pmic-adp5520", ID_ADP5520 },
 346         { "pmic-adp5501", ID_ADP5501 },
 347         { }
 348 };
 349 MODULE_DEVICE_TABLE(i2c, adp5520_id);
 350
 351 static struct i2c_driver adp5520_driver = {
 352         .driver = {
 353                 .name   = "adp5520",
 354                 .owner  = THIS_MODULE,
 355                 .pm     = &adp5520_pm,
 356         },
 357         .probe          = adp5520_probe,
 358         .remove         = adp5520_remove,
 359         .id_table       = adp5520_id,
 360 };
 361
 362 module_i2c_driver(adp5520_driver);
 363
 364 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 365 MODULE_DESCRIPTION("ADP5520(01) PMIC-MFD Driver");
 366 MODULE_LICENSE("GPL");