drivers/mfd/pcf50633-core.c

   1 /* NXP PCF50633 Power Management Unit (PMU) driver
   2  *
   3  * (C) 2006-2008 by Openmoko, Inc.
   4  * Author: Harald Welte <laforge@openmoko.org>
   5  *         Balaji Rao <balajirrao@openmoko.org>
   6  * All rights reserved.
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  *
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/device.h>
  17 #include <linux/sysfs.h>
  18 #include <linux/module.h>
  19 #include <linux/types.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/workqueue.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/i2c.h>
  24 #include <linux/slab.h>
  25
  26 #include <linux/mfd/pcf50633/core.h>
  27
  28 static int __pcf50633_read(struct pcf50633 *pcf, u8 reg, int num, u8 *data)
  29 {
  30         int ret;
  31
  32         ret = i2c_smbus_read_i2c_block_data(pcf->i2c_client, reg,
  33                                 num, data);
  34         if (ret < 0)
  35                 dev_err(pcf->dev, "Error reading %d regs at %d\n", num, reg);
  36
  37         return ret;
  38 }
  39
  40 static int __pcf50633_write(struct pcf50633 *pcf, u8 reg, int num, u8 *data)
  41 {
  42         int ret;
  43
  44         ret = i2c_smbus_write_i2c_block_data(pcf->i2c_client, reg,
  45                                 num, data);
  46         if (ret < 0)
  47                 dev_err(pcf->dev, "Error writing %d regs at %d\n", num, reg);
  48
  49         return ret;
  50
  51 }
  52
  53 /* Read a block of upto 32 regs  */
  54 int pcf50633_read_block(struct pcf50633 *pcf, u8 reg,
  55                                         int nr_regs, u8 *data)
  56 {
  57         int ret;
  58
  59         mutex_lock(&pcf->lock);
  60         ret = __pcf50633_read(pcf, reg, nr_regs, data);
  61         mutex_unlock(&pcf->lock);
  62
  63         return ret;
  64 }
  65 EXPORT_SYMBOL_GPL(pcf50633_read_block);
  66
  67 /* Write a block of upto 32 regs  */
  68 int pcf50633_write_block(struct pcf50633 *pcf , u8 reg,
  69                                         int nr_regs, u8 *data)
  70 {
  71         int ret;
  72
  73         mutex_lock(&pcf->lock);
  74         ret = __pcf50633_write(pcf, reg, nr_regs, data);
  75         mutex_unlock(&pcf->lock);
  76
  77         return ret;
  78 }
  79 EXPORT_SYMBOL_GPL(pcf50633_write_block);
  80
  81 u8 pcf50633_reg_read(struct pcf50633 *pcf, u8 reg)
  82 {
  83         u8 val;
  84
  85         mutex_lock(&pcf->lock);
  86         __pcf50633_read(pcf, reg, 1, &val);
  87         mutex_unlock(&pcf->lock);
  88
  89         return val;
  90 }
  91 EXPORT_SYMBOL_GPL(pcf50633_reg_read);
  92
  93 int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val)
  94 {
  95         int ret;
  96
  97         mutex_lock(&pcf->lock);
  98         ret = __pcf50633_write(pcf, reg, 1, &val);
  99         mutex_unlock(&pcf->lock);
 100
 101         return ret;
 102 }
 103 EXPORT_SYMBOL_GPL(pcf50633_reg_write);
 104
 105 int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val)
 106 {
 107         int ret;
 108         u8 tmp;
 109
 110         val &= mask;
 111
 112         mutex_lock(&pcf->lock);
 113         ret = __pcf50633_read(pcf, reg, 1, &tmp);
 114         if (ret < 0)
 115                 goto out;
 116
 117         tmp &= ~mask;
 118         tmp |= val;
 119         ret = __pcf50633_write(pcf, reg, 1, &tmp);
 120
 121 out:
 122         mutex_unlock(&pcf->lock);
 123
 124         return ret;
 125 }
 126 EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask);
 127
 128 int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val)
 129 {
 130         int ret;
 131         u8 tmp;
 132
 133         mutex_lock(&pcf->lock);
 134         ret = __pcf50633_read(pcf, reg, 1, &tmp);
 135         if (ret < 0)
 136                 goto out;
 137
 138         tmp &= ~val;
 139         ret = __pcf50633_write(pcf, reg, 1, &tmp);
 140
 141 out:
 142         mutex_unlock(&pcf->lock);
 143
 144         return ret;
 145 }
 146 EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits);
 147
 148 /* sysfs attributes */
 149 static ssize_t show_dump_regs(struct device *dev, struct device_attribute *attr,
 150                             char *buf)
 151 {
 152         struct pcf50633 *pcf = dev_get_drvdata(dev);
 153         u8 dump[16];
 154         int n, n1, idx = 0;
 155         char *buf1 = buf;
 156         static u8 address_no_read[] = { /* must be ascending */
 157                 PCF50633_REG_INT1,
 158                 PCF50633_REG_INT2,
 159                 PCF50633_REG_INT3,
 160                 PCF50633_REG_INT4,
 161                 PCF50633_REG_INT5,
 162                 0 /* terminator */
 163         };
 164
 165         for (n = 0; n < 256; n += sizeof(dump)) {
 166                 for (n1 = 0; n1 < sizeof(dump); n1++)
 167                         if (n == address_no_read[idx]) {
 168                                 idx++;
 169                                 dump[n1] = 0x00;
 170                         } else
 171                                 dump[n1] = pcf50633_reg_read(pcf, n + n1);
 172
 173                 hex_dump_to_buffer(dump, sizeof(dump), 16, 1, buf1, 128, 0);
 174                 buf1 += strlen(buf1);
 175                 *buf1++ = '\n';
 176                 *buf1 = '\0';
 177         }
 178
 179         return buf1 - buf;
 180 }
 181 static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL);
 182
 183 static ssize_t show_resume_reason(struct device *dev,
 184                                 struct device_attribute *attr, char *buf)
 185 {
 186         struct pcf50633 *pcf = dev_get_drvdata(dev);
 187         int n;
 188
 189         n = sprintf(buf, "%02x%02x%02x%02x%02x\n",
 190                                 pcf->resume_reason[0],
 191                                 pcf->resume_reason[1],
 192                                 pcf->resume_reason[2],
 193                                 pcf->resume_reason[3],
 194                                 pcf->resume_reason[4]);
 195
 196         return n;
 197 }
 198 static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL);
 199
 200 static struct attribute *pcf_sysfs_entries[] = {
 201         &dev_attr_dump_regs.attr,
 202         &dev_attr_resume_reason.attr,
 203         NULL,
 204 };
 205
 206 static struct attribute_group pcf_attr_group = {
 207         .name   = NULL,                 /* put in device directory */
 208         .attrs  = pcf_sysfs_entries,
 209 };
 210
 211 static void
 212 pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name,
 213                                                 struct platform_device **pdev)
 214 {
 215         int ret;
 216
 217         *pdev = platform_device_alloc(name, -1);
 218         if (!*pdev) {
 219                 dev_err(pcf->dev, "Falied to allocate %s\n", name);
 220                 return;
 221         }
 222
 223         (*pdev)->dev.parent = pcf->dev;
 224
 225         ret = platform_device_add(*pdev);
 226         if (ret) {
 227                 dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret);
 228                 platform_device_put(*pdev);
 229                 *pdev = NULL;
 230         }
 231 }
 232
 233 #ifdef CONFIG_PM
 234 static int pcf50633_suspend(struct i2c_client *client, pm_message_t state)
 235 {
 236         struct pcf50633 *pcf;
 237         pcf = i2c_get_clientdata(client);
 238
 239         return pcf50633_irq_suspend(pcf);
 240 }
 241
 242 static int pcf50633_resume(struct i2c_client *client)
 243 {
 244         struct pcf50633 *pcf;
 245         pcf = i2c_get_clientdata(client);
 246
 247         return pcf50633_irq_resume(pcf);
 248 }
 249 #else
 250 #define pcf50633_suspend NULL
 251 #define pcf50633_resume NULL
 252 #endif
 253
 254 static int __devinit pcf50633_probe(struct i2c_client *client,
 255                                 const struct i2c_device_id *ids)
 256 {
 257         struct pcf50633 *pcf;
 258         struct pcf50633_platform_data *pdata = client->dev.platform_data;
 259         int i, ret;
 260         int version, variant;
 261
 262         if (!client->irq) {
 263                 dev_err(&client->dev, "Missing IRQ\n");
 264                 return -ENOENT;
 265         }
 266
 267         pcf = kzalloc(sizeof(*pcf), GFP_KERNEL);
 268         if (!pcf)
 269                 return -ENOMEM;
 270
 271         pcf->pdata = pdata;
 272
 273         mutex_init(&pcf->lock);
 274
 275         i2c_set_clientdata(client, pcf);
 276         pcf->dev = &client->dev;
 277         pcf->i2c_client = client;
 278
 279         version = pcf50633_reg_read(pcf, 0);
 280         variant = pcf50633_reg_read(pcf, 1);
 281         if (version < 0 || variant < 0) {
 282                 dev_err(pcf->dev, "Unable to probe pcf50633\n");
 283                 ret = -ENODEV;
 284                 goto err_free;
 285         }
 286
 287         dev_info(pcf->dev, "Probed device version %d variant %d\n",
 288                                                         version, variant);
 289
 290         pcf50633_irq_init(pcf, client->irq);
 291
 292         /* Create sub devices */
 293         pcf50633_client_dev_register(pcf, "pcf50633-input",
 294                                                 &pcf->input_pdev);
 295         pcf50633_client_dev_register(pcf, "pcf50633-rtc",
 296                                                 &pcf->rtc_pdev);
 297         pcf50633_client_dev_register(pcf, "pcf50633-mbc",
 298                                                 &pcf->mbc_pdev);
 299         pcf50633_client_dev_register(pcf, "pcf50633-adc",
 300                                                 &pcf->adc_pdev);
 301         pcf50633_client_dev_register(pcf, "pcf50633-backlight",
 302                                                 &pcf->bl_pdev);
 303
 304
 305         for (i = 0; i < PCF50633_NUM_REGULATORS; i++) {
 306                 struct platform_device *pdev;
 307
 308                 pdev = platform_device_alloc("pcf50633-regltr", i);
 309                 if (!pdev) {
 310                         dev_err(pcf->dev, "Cannot create regulator %d\n", i);
 311                         continue;
 312                 }
 313
 314                 pdev->dev.parent = pcf->dev;
 315                 platform_device_add_data(pdev, &pdata->reg_init_data[i],
 316                                         sizeof(pdata->reg_init_data[i]));
 317                 pcf->regulator_pdev[i] = pdev;
 318
 319                 platform_device_add(pdev);
 320         }
 321
 322         ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group);
 323         if (ret)
 324                 dev_err(pcf->dev, "error creating sysfs entries\n");
 325
 326         if (pdata->probe_done)
 327                 pdata->probe_done(pcf);
 328
 329         return 0;
 330
 331 err_free:
 332         kfree(pcf);
 333
 334         return ret;
 335 }
 336
 337 static int __devexit pcf50633_remove(struct i2c_client *client)
 338 {
 339         struct pcf50633 *pcf = i2c_get_clientdata(client);
 340         int i;
 341
 342         sysfs_remove_group(&client->dev.kobj, &pcf_attr_group);
 343         pcf50633_irq_free(pcf);
 344
 345         platform_device_unregister(pcf->input_pdev);
 346         platform_device_unregister(pcf->rtc_pdev);
 347         platform_device_unregister(pcf->mbc_pdev);
 348         platform_device_unregister(pcf->adc_pdev);
 349         platform_device_unregister(pcf->bl_pdev);
 350
 351         for (i = 0; i < PCF50633_NUM_REGULATORS; i++)
 352                 platform_device_unregister(pcf->regulator_pdev[i]);
 353
 354         kfree(pcf);
 355
 356         return 0;
 357 }
 358
 359 static struct i2c_device_id pcf50633_id_table[] = {
 360         {"pcf50633", 0x73},
 361         {/* end of list */}
 362 };
 363
 364 static struct i2c_driver pcf50633_driver = {
 365         .driver = {
 366                 .name   = "pcf50633",
 367         },
 368         .id_table = pcf50633_id_table,
 369         .probe = pcf50633_probe,
 370         .remove = __devexit_p(pcf50633_remove),
 371         .suspend = pcf50633_suspend,
 372         .resume = pcf50633_resume,
 373 };
 374
 375 static int __init pcf50633_init(void)
 376 {
 377         return i2c_add_driver(&pcf50633_driver);
 378 }
 379
 380 static void __exit pcf50633_exit(void)
 381 {
 382         i2c_del_driver(&pcf50633_driver);
 383 }
 384
 385 MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU");
 386 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
 387 MODULE_LICENSE("GPL");
 388
 389 subsys_initcall(pcf50633_init);
 390 module_exit(pcf50633_exit);