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/pm.h>
  25 #include <linux/slab.h>
  26
  27 #include <linux/mfd/pcf50633/core.h>
  28
  29 static int __pcf50633_read(struct pcf50633 *pcf, u8 reg, int num, u8 *data)
  30 {
  31         int ret;
  32
  33         ret = i2c_smbus_read_i2c_block_data(pcf->i2c_client, reg,
  34                                 num, data);
  35         if (ret < 0)
  36                 dev_err(pcf->dev, "Error reading %d regs at %d\n", num, reg);
  37
  38         return ret;
  39 }
  40
  41 static int __pcf50633_write(struct pcf50633 *pcf, u8 reg, int num, u8 *data)
  42 {
  43         int ret;
  44
  45         ret = i2c_smbus_write_i2c_block_data(pcf->i2c_client, reg,
  46                                 num, data);
  47         if (ret < 0)
  48                 dev_err(pcf->dev, "Error writing %d regs at %d\n", num, reg);
  49
  50         return ret;
  51
  52 }
  53
  54 /* Read a block of up to 32 regs  */
  55 int pcf50633_read_block(struct pcf50633 *pcf, u8 reg,
  56                                         int nr_regs, u8 *data)
  57 {
  58         int ret;
  59
  60         mutex_lock(&pcf->lock);
  61         ret = __pcf50633_read(pcf, reg, nr_regs, data);
  62         mutex_unlock(&pcf->lock);
  63
  64         return ret;
  65 }
  66 EXPORT_SYMBOL_GPL(pcf50633_read_block);
  67
  68 /* Write a block of up to 32 regs  */
  69 int pcf50633_write_block(struct pcf50633 *pcf , u8 reg,
  70                                         int nr_regs, u8 *data)
  71 {
  72         int ret;
  73
  74         mutex_lock(&pcf->lock);
  75         ret = __pcf50633_write(pcf, reg, nr_regs, data);
  76         mutex_unlock(&pcf->lock);
  77
  78         return ret;
  79 }
  80 EXPORT_SYMBOL_GPL(pcf50633_write_block);
  81
  82 u8 pcf50633_reg_read(struct pcf50633 *pcf, u8 reg)
  83 {
  84         u8 val;
  85
  86         mutex_lock(&pcf->lock);
  87         __pcf50633_read(pcf, reg, 1, &val);
  88         mutex_unlock(&pcf->lock);
  89
  90         return val;
  91 }
  92 EXPORT_SYMBOL_GPL(pcf50633_reg_read);
  93
  94 int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val)
  95 {
  96         int ret;
  97
  98         mutex_lock(&pcf->lock);
  99         ret = __pcf50633_write(pcf, reg, 1, &val);
 100         mutex_unlock(&pcf->lock);
 101
 102         return ret;
 103 }
 104 EXPORT_SYMBOL_GPL(pcf50633_reg_write);
 105
 106 int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val)
 107 {
 108         int ret;
 109         u8 tmp;
 110
 111         val &= mask;
 112
 113         mutex_lock(&pcf->lock);
 114         ret = __pcf50633_read(pcf, reg, 1, &tmp);
 115         if (ret < 0)
 116                 goto out;
 117
 118         tmp &= ~mask;
 119         tmp |= val;
 120         ret = __pcf50633_write(pcf, reg, 1, &tmp);
 121
 122 out:
 123         mutex_unlock(&pcf->lock);
 124
 125         return ret;
 126 }
 127 EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask);
 128
 129 int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val)
 130 {
 131         int ret;
 132         u8 tmp;
 133
 134         mutex_lock(&pcf->lock);
 135         ret = __pcf50633_read(pcf, reg, 1, &tmp);
 136         if (ret < 0)
 137                 goto out;
 138
 139         tmp &= ~val;
 140         ret = __pcf50633_write(pcf, reg, 1, &tmp);
 141
 142 out:
 143         mutex_unlock(&pcf->lock);
 144
 145         return ret;
 146 }
 147 EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits);
 148
 149 /* sysfs attributes */
 150 static ssize_t show_dump_regs(struct device *dev, struct device_attribute *attr,
 151                             char *buf)
 152 {
 153         struct pcf50633 *pcf = dev_get_drvdata(dev);
 154         u8 dump[16];
 155         int n, n1, idx = 0;
 156         char *buf1 = buf;
 157         static u8 address_no_read[] = { /* must be ascending */
 158                 PCF50633_REG_INT1,
 159                 PCF50633_REG_INT2,
 160                 PCF50633_REG_INT3,
 161                 PCF50633_REG_INT4,
 162                 PCF50633_REG_INT5,
 163                 0 /* terminator */
 164         };
 165
 166         for (n = 0; n < 256; n += sizeof(dump)) {
 167                 for (n1 = 0; n1 < sizeof(dump); n1++)
 168                         if (n == address_no_read[idx]) {
 169                                 idx++;
 170                                 dump[n1] = 0x00;
 171                         } else
 172                                 dump[n1] = pcf50633_reg_read(pcf, n + n1);
 173
 174                 hex_dump_to_buffer(dump, sizeof(dump), 16, 1, buf1, 128, 0);
 175                 buf1 += strlen(buf1);
 176                 *buf1++ = '\n';
 177                 *buf1 = '\0';
 178         }
 179
 180         return buf1 - buf;
 181 }
 182 static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL);
 183
 184 static ssize_t show_resume_reason(struct device *dev,
 185                                 struct device_attribute *attr, char *buf)
 186 {
 187         struct pcf50633 *pcf = dev_get_drvdata(dev);
 188         int n;
 189
 190         n = sprintf(buf, "%02x%02x%02x%02x%02x\n",
 191                                 pcf->resume_reason[0],
 192                                 pcf->resume_reason[1],
 193                                 pcf->resume_reason[2],
 194                                 pcf->resume_reason[3],
 195                                 pcf->resume_reason[4]);
 196
 197         return n;
 198 }
 199 static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL);
 200
 201 static struct attribute *pcf_sysfs_entries[] = {
 202         &dev_attr_dump_regs.attr,
 203         &dev_attr_resume_reason.attr,
 204         NULL,
 205 };
 206
 207 static struct attribute_group pcf_attr_group = {
 208         .name   = NULL,                 /* put in device directory */
 209         .attrs  = pcf_sysfs_entries,
 210 };
 211
 212 static void
 213 pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name,
 214                                                 struct platform_device **pdev)
 215 {
 216         int ret;
 217
 218         *pdev = platform_device_alloc(name, -1);
 219         if (!*pdev) {
 220                 dev_err(pcf->dev, "Falied to allocate %s\n", name);
 221                 return;
 222         }
 223
 224         (*pdev)->dev.parent = pcf->dev;
 225
 226         ret = platform_device_add(*pdev);
 227         if (ret) {
 228                 dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret);
 229                 platform_device_put(*pdev);
 230                 *pdev = NULL;
 231         }
 232 }
 233
 234 #ifdef CONFIG_PM_SLEEP
 235 static int pcf50633_suspend(struct device *dev)
 236 {
 237         struct i2c_client *client = to_i2c_client(dev);
 238         struct pcf50633 *pcf = i2c_get_clientdata(client);
 239
 240         return pcf50633_irq_suspend(pcf);
 241 }
 242
 243 static int pcf50633_resume(struct device *dev)
 244 {
 245         struct i2c_client *client = to_i2c_client(dev);
 246         struct pcf50633 *pcf = i2c_get_clientdata(client);
 247
 248         return pcf50633_irq_resume(pcf);
 249 }
 250 #endif
 251
 252 static SIMPLE_DEV_PM_OPS(pcf50633_pm, pcf50633_suspend, pcf50633_resume);
 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 const struct i2c_device_id pcf50633_id_table[] = {
 360         {"pcf50633", 0x73},
 361         {/* end of list */}
 362 };
 363 MODULE_DEVICE_TABLE(i2c, pcf50633_id_table);
 364
 365 static struct i2c_driver pcf50633_driver = {
 366         .driver = {
 367                 .name   = "pcf50633",
 368                 .pm     = &pcf50633_pm,
 369         },
 370         .id_table = pcf50633_id_table,
 371         .probe = pcf50633_probe,
 372         .remove = __devexit_p(pcf50633_remove),
 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);