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 int pcf50633_irq_init(struct pcf50633 *pcf, int irq);
  29 void pcf50633_irq_free(struct pcf50633 *pcf);
  30 #ifdef CONFIG_PM
  31 int pcf50633_irq_suspend(struct pcf50633 *pcf);
  32 int pcf50633_irq_resume(struct pcf50633 *pcf);
  33 #endif
  34
  35 static int __pcf50633_read(struct pcf50633 *pcf, u8 reg, int num, u8 *data)
  36 {
  37         int ret;
  38
  39         ret = i2c_smbus_read_i2c_block_data(pcf->i2c_client, reg,
  40                                 num, data);
  41         if (ret < 0)
  42                 dev_err(pcf->dev, "Error reading %d regs at %d\n", num, reg);
  43
  44         return ret;
  45 }
  46
  47 static int __pcf50633_write(struct pcf50633 *pcf, u8 reg, int num, u8 *data)
  48 {
  49         int ret;
  50
  51         ret = i2c_smbus_write_i2c_block_data(pcf->i2c_client, reg,
  52                                 num, data);
  53         if (ret < 0)
  54                 dev_err(pcf->dev, "Error writing %d regs at %d\n", num, reg);
  55
  56         return ret;
  57
  58 }
  59
  60 /* Read a block of upto 32 regs  */
  61 int pcf50633_read_block(struct pcf50633 *pcf, u8 reg,
  62                                         int nr_regs, u8 *data)
  63 {
  64         int ret;
  65
  66         mutex_lock(&pcf->lock);
  67         ret = __pcf50633_read(pcf, reg, nr_regs, data);
  68         mutex_unlock(&pcf->lock);
  69
  70         return ret;
  71 }
  72 EXPORT_SYMBOL_GPL(pcf50633_read_block);
  73
  74 /* Write a block of upto 32 regs  */
  75 int pcf50633_write_block(struct pcf50633 *pcf , u8 reg,
  76                                         int nr_regs, u8 *data)
  77 {
  78         int ret;
  79
  80         mutex_lock(&pcf->lock);
  81         ret = __pcf50633_write(pcf, reg, nr_regs, data);
  82         mutex_unlock(&pcf->lock);
  83
  84         return ret;
  85 }
  86 EXPORT_SYMBOL_GPL(pcf50633_write_block);
  87
  88 u8 pcf50633_reg_read(struct pcf50633 *pcf, u8 reg)
  89 {
  90         u8 val;
  91
  92         mutex_lock(&pcf->lock);
  93         __pcf50633_read(pcf, reg, 1, &val);
  94         mutex_unlock(&pcf->lock);
  95
  96         return val;
  97 }
  98 EXPORT_SYMBOL_GPL(pcf50633_reg_read);
  99
 100 int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val)
 101 {
 102         int ret;
 103
 104         mutex_lock(&pcf->lock);
 105         ret = __pcf50633_write(pcf, reg, 1, &val);
 106         mutex_unlock(&pcf->lock);
 107
 108         return ret;
 109 }
 110 EXPORT_SYMBOL_GPL(pcf50633_reg_write);
 111
 112 int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val)
 113 {
 114         int ret;
 115         u8 tmp;
 116
 117         val &= mask;
 118
 119         mutex_lock(&pcf->lock);
 120         ret = __pcf50633_read(pcf, reg, 1, &tmp);
 121         if (ret < 0)
 122                 goto out;
 123
 124         tmp &= ~mask;
 125         tmp |= val;
 126         ret = __pcf50633_write(pcf, reg, 1, &tmp);
 127
 128 out:
 129         mutex_unlock(&pcf->lock);
 130
 131         return ret;
 132 }
 133 EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask);
 134
 135 int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val)
 136 {
 137         int ret;
 138         u8 tmp;
 139
 140         mutex_lock(&pcf->lock);
 141         ret = __pcf50633_read(pcf, reg, 1, &tmp);
 142         if (ret < 0)
 143                 goto out;
 144
 145         tmp &= ~val;
 146         ret = __pcf50633_write(pcf, reg, 1, &tmp);
 147
 148 out:
 149         mutex_unlock(&pcf->lock);
 150
 151         return ret;
 152 }
 153 EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits);
 154
 155 /* sysfs attributes */
 156 static ssize_t show_dump_regs(struct device *dev, struct device_attribute *attr,
 157                             char *buf)
 158 {
 159         struct pcf50633 *pcf = dev_get_drvdata(dev);
 160         u8 dump[16];
 161         int n, n1, idx = 0;
 162         char *buf1 = buf;
 163         static u8 address_no_read[] = { /* must be ascending */
 164                 PCF50633_REG_INT1,
 165                 PCF50633_REG_INT2,
 166                 PCF50633_REG_INT3,
 167                 PCF50633_REG_INT4,
 168                 PCF50633_REG_INT5,
 169                 0 /* terminator */
 170         };
 171
 172         for (n = 0; n < 256; n += sizeof(dump)) {
 173                 for (n1 = 0; n1 < sizeof(dump); n1++)
 174                         if (n == address_no_read[idx]) {
 175                                 idx++;
 176                                 dump[n1] = 0x00;
 177                         } else
 178                                 dump[n1] = pcf50633_reg_read(pcf, n + n1);
 179
 180                 hex_dump_to_buffer(dump, sizeof(dump), 16, 1, buf1, 128, 0);
 181                 buf1 += strlen(buf1);
 182                 *buf1++ = '\n';
 183                 *buf1 = '\0';
 184         }
 185
 186         return buf1 - buf;
 187 }
 188 static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL);
 189
 190 static ssize_t show_resume_reason(struct device *dev,
 191                                 struct device_attribute *attr, char *buf)
 192 {
 193         struct pcf50633 *pcf = dev_get_drvdata(dev);
 194         int n;
 195
 196         n = sprintf(buf, "%02x%02x%02x%02x%02x\n",
 197                                 pcf->resume_reason[0],
 198                                 pcf->resume_reason[1],
 199                                 pcf->resume_reason[2],
 200                                 pcf->resume_reason[3],
 201                                 pcf->resume_reason[4]);
 202
 203         return n;
 204 }
 205 static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL);
 206
 207 static struct attribute *pcf_sysfs_entries[] = {
 208         &dev_attr_dump_regs.attr,
 209         &dev_attr_resume_reason.attr,
 210         NULL,
 211 };
 212
 213 static struct attribute_group pcf_attr_group = {
 214         .name   = NULL,                 /* put in device directory */
 215         .attrs  = pcf_sysfs_entries,
 216 };
 217
 218 static void
 219 pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name,
 220                                                 struct platform_device **pdev)
 221 {
 222         int ret;
 223
 224         *pdev = platform_device_alloc(name, -1);
 225         if (!*pdev) {
 226                 dev_err(pcf->dev, "Falied to allocate %s\n", name);
 227                 return;
 228         }
 229
 230         (*pdev)->dev.parent = pcf->dev;
 231
 232         ret = platform_device_add(*pdev);
 233         if (ret) {
 234                 dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret);
 235                 platform_device_put(*pdev);
 236                 *pdev = NULL;
 237         }
 238 }
 239
 240 #ifdef CONFIG_PM
 241 static int pcf50633_suspend(struct i2c_client *client, pm_message_t state)
 242 {
 243         struct pcf50633 *pcf;
 244         pcf = i2c_get_clientdata(client);
 245
 246         return pcf50633_irq_suspend(pcf);
 247 }
 248
 249 static int pcf50633_resume(struct i2c_client *client)
 250 {
 251         struct pcf50633 *pcf;
 252         pcf = i2c_get_clientdata(client);
 253
 254         return pcf50633_irq_resume(pcf);
 255 }
 256 #else
 257 #define pcf50633_suspend NULL
 258 #define pcf50633_resume NULL
 259 #endif
 260
 261 static int __devinit pcf50633_probe(struct i2c_client *client,
 262                                 const struct i2c_device_id *ids)
 263 {
 264         struct pcf50633 *pcf;
 265         struct pcf50633_platform_data *pdata = client->dev.platform_data;
 266         int i, ret;
 267         int version, variant;
 268
 269         if (!client->irq) {
 270                 dev_err(&client->dev, "Missing IRQ\n");
 271                 return -ENOENT;
 272         }
 273
 274         pcf = kzalloc(sizeof(*pcf), GFP_KERNEL);
 275         if (!pcf)
 276                 return -ENOMEM;
 277
 278         pcf->pdata = pdata;
 279
 280         mutex_init(&pcf->lock);
 281
 282         i2c_set_clientdata(client, pcf);
 283         pcf->dev = &client->dev;
 284         pcf->i2c_client = client;
 285
 286         version = pcf50633_reg_read(pcf, 0);
 287         variant = pcf50633_reg_read(pcf, 1);
 288         if (version < 0 || variant < 0) {
 289                 dev_err(pcf->dev, "Unable to probe pcf50633\n");
 290                 ret = -ENODEV;
 291                 goto err_free;
 292         }
 293
 294         dev_info(pcf->dev, "Probed device version %d variant %d\n",
 295                                                         version, variant);
 296
 297         pcf50633_irq_init(pcf, client->irq);
 298
 299         /* Create sub devices */
 300         pcf50633_client_dev_register(pcf, "pcf50633-input",
 301                                                 &pcf->input_pdev);
 302         pcf50633_client_dev_register(pcf, "pcf50633-rtc",
 303                                                 &pcf->rtc_pdev);
 304         pcf50633_client_dev_register(pcf, "pcf50633-mbc",
 305                                                 &pcf->mbc_pdev);
 306         pcf50633_client_dev_register(pcf, "pcf50633-adc",
 307                                                 &pcf->adc_pdev);
 308         pcf50633_client_dev_register(pcf, "pcf50633-backlight",
 309                                                 &pcf->bl_pdev);
 310
 311
 312         for (i = 0; i < PCF50633_NUM_REGULATORS; i++) {
 313                 struct platform_device *pdev;
 314
 315                 pdev = platform_device_alloc("pcf50633-regltr", i);
 316                 if (!pdev) {
 317                         dev_err(pcf->dev, "Cannot create regulator %d\n", i);
 318                         continue;
 319                 }
 320
 321                 pdev->dev.parent = pcf->dev;
 322                 platform_device_add_data(pdev, &pdata->reg_init_data[i],
 323                                         sizeof(pdata->reg_init_data[i]));
 324                 pcf->regulator_pdev[i] = pdev;
 325
 326                 platform_device_add(pdev);
 327         }
 328
 329         ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group);
 330         if (ret)
 331                 dev_err(pcf->dev, "error creating sysfs entries\n");
 332
 333         if (pdata->probe_done)
 334                 pdata->probe_done(pcf);
 335
 336         return 0;
 337
 338 err_free:
 339         i2c_set_clientdata(client, NULL);
 340         kfree(pcf);
 341
 342         return ret;
 343 }
 344
 345 static int __devexit pcf50633_remove(struct i2c_client *client)
 346 {
 347         struct pcf50633 *pcf = i2c_get_clientdata(client);
 348         int i;
 349
 350         pcf50633_irq_free(pcf);
 351
 352         platform_device_unregister(pcf->input_pdev);
 353         platform_device_unregister(pcf->rtc_pdev);
 354         platform_device_unregister(pcf->mbc_pdev);
 355         platform_device_unregister(pcf->adc_pdev);
 356
 357         for (i = 0; i < PCF50633_NUM_REGULATORS; i++)
 358                 platform_device_unregister(pcf->regulator_pdev[i]);
 359
 360         i2c_set_clientdata(client, NULL);
 361         kfree(pcf);
 362
 363         return 0;
 364 }
 365
 366 static struct i2c_device_id pcf50633_id_table[] = {
 367         {"pcf50633", 0x73},
 368         {/* end of list */}
 369 };
 370
 371 static struct i2c_driver pcf50633_driver = {
 372         .driver = {
 373                 .name   = "pcf50633",
 374         },
 375         .id_table = pcf50633_id_table,
 376         .probe = pcf50633_probe,
 377         .remove = __devexit_p(pcf50633_remove),
 378         .suspend = pcf50633_suspend,
 379         .resume = pcf50633_resume,
 380 };
 381
 382 static int __init pcf50633_init(void)
 383 {
 384         return i2c_add_driver(&pcf50633_driver);
 385 }
 386
 387 static void __exit pcf50633_exit(void)
 388 {
 389         i2c_del_driver(&pcf50633_driver);
 390 }
 391
 392 MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU");
 393 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
 394 MODULE_LICENSE("GPL");
 395
 396 subsys_initcall(pcf50633_init);
 397 module_exit(pcf50633_exit);