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 #include <linux/regmap.h>
  27 #include <linux/err.h>
  28
  29 #include <linux/mfd/pcf50633/core.h>
  30
  31 /* Read a block of up to 32 regs  */
  32 int pcf50633_read_block(struct pcf50633 *pcf, u8 reg,
  33                                         int nr_regs, u8 *data)
  34 {
  35         int ret;
  36
  37         ret = regmap_raw_read(pcf->regmap, reg, data, nr_regs);
  38         if (ret != 0)
  39                 return ret;
  40
  41         return nr_regs;
  42 }
  43 EXPORT_SYMBOL_GPL(pcf50633_read_block);
  44
  45 /* Write a block of up to 32 regs  */
  46 int pcf50633_write_block(struct pcf50633 *pcf , u8 reg,
  47                                         int nr_regs, u8 *data)
  48 {
  49         int ret;
  50
  51         ret = regmap_raw_write(pcf->regmap, reg, data, nr_regs);
  52         if (ret != 0)
  53                 return ret;
  54
  55         return nr_regs;
  56 }
  57 EXPORT_SYMBOL_GPL(pcf50633_write_block);
  58
  59 u8 pcf50633_reg_read(struct pcf50633 *pcf, u8 reg)
  60 {
  61         unsigned int val;
  62         int ret;
  63
  64         ret = regmap_read(pcf->regmap, reg, &val);
  65         if (ret < 0)
  66                 return -1;
  67
  68         return val;
  69 }
  70 EXPORT_SYMBOL_GPL(pcf50633_reg_read);
  71
  72 int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val)
  73 {
  74         return regmap_write(pcf->regmap, reg, val);
  75 }
  76 EXPORT_SYMBOL_GPL(pcf50633_reg_write);
  77
  78 int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val)
  79 {
  80         return regmap_update_bits(pcf->regmap, reg, mask, val);
  81 }
  82 EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask);
  83
  84 int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val)
  85 {
  86         return regmap_update_bits(pcf->regmap, reg, val, 0);
  87 }
  88 EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits);
  89
  90 /* sysfs attributes */
  91 static ssize_t show_dump_regs(struct device *dev, struct device_attribute *attr,
  92                             char *buf)
  93 {
  94         struct pcf50633 *pcf = dev_get_drvdata(dev);
  95         u8 dump[16];
  96         int n, n1, idx = 0;
  97         char *buf1 = buf;
  98         static u8 address_no_read[] = { /* must be ascending */
  99                 PCF50633_REG_INT1,
 100                 PCF50633_REG_INT2,
 101                 PCF50633_REG_INT3,
 102                 PCF50633_REG_INT4,
 103                 PCF50633_REG_INT5,
 104                 0 /* terminator */
 105         };
 106
 107         for (n = 0; n < 256; n += sizeof(dump)) {
 108                 for (n1 = 0; n1 < sizeof(dump); n1++)
 109                         if (n == address_no_read[idx]) {
 110                                 idx++;
 111                                 dump[n1] = 0x00;
 112                         } else
 113                                 dump[n1] = pcf50633_reg_read(pcf, n + n1);
 114
 115                 hex_dump_to_buffer(dump, sizeof(dump), 16, 1, buf1, 128, 0);
 116                 buf1 += strlen(buf1);
 117                 *buf1++ = '\n';
 118                 *buf1 = '\0';
 119         }
 120
 121         return buf1 - buf;
 122 }
 123 static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL);
 124
 125 static ssize_t show_resume_reason(struct device *dev,
 126                                 struct device_attribute *attr, char *buf)
 127 {
 128         struct pcf50633 *pcf = dev_get_drvdata(dev);
 129         int n;
 130
 131         n = sprintf(buf, "%02x%02x%02x%02x%02x\n",
 132                                 pcf->resume_reason[0],
 133                                 pcf->resume_reason[1],
 134                                 pcf->resume_reason[2],
 135                                 pcf->resume_reason[3],
 136                                 pcf->resume_reason[4]);
 137
 138         return n;
 139 }
 140 static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL);
 141
 142 static struct attribute *pcf_sysfs_entries[] = {
 143         &dev_attr_dump_regs.attr,
 144         &dev_attr_resume_reason.attr,
 145         NULL,
 146 };
 147
 148 static struct attribute_group pcf_attr_group = {
 149         .name   = NULL,                 /* put in device directory */
 150         .attrs  = pcf_sysfs_entries,
 151 };
 152
 153 static void
 154 pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name,
 155                                                 struct platform_device **pdev)
 156 {
 157         int ret;
 158
 159         *pdev = platform_device_alloc(name, -1);
 160         if (!*pdev) {
 161                 dev_err(pcf->dev, "Falied to allocate %s\n", name);
 162                 return;
 163         }
 164
 165         (*pdev)->dev.parent = pcf->dev;
 166
 167         ret = platform_device_add(*pdev);
 168         if (ret) {
 169                 dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret);
 170                 platform_device_put(*pdev);
 171                 *pdev = NULL;
 172         }
 173 }
 174
 175 #ifdef CONFIG_PM_SLEEP
 176 static int pcf50633_suspend(struct device *dev)
 177 {
 178         struct i2c_client *client = to_i2c_client(dev);
 179         struct pcf50633 *pcf = i2c_get_clientdata(client);
 180
 181         return pcf50633_irq_suspend(pcf);
 182 }
 183
 184 static int pcf50633_resume(struct device *dev)
 185 {
 186         struct i2c_client *client = to_i2c_client(dev);
 187         struct pcf50633 *pcf = i2c_get_clientdata(client);
 188
 189         return pcf50633_irq_resume(pcf);
 190 }
 191 #endif
 192
 193 static SIMPLE_DEV_PM_OPS(pcf50633_pm, pcf50633_suspend, pcf50633_resume);
 194
 195 static struct regmap_config pcf50633_regmap_config = {
 196         .reg_bits = 8,
 197         .val_bits = 8,
 198 };
 199
 200 static int __devinit pcf50633_probe(struct i2c_client *client,
 201                                 const struct i2c_device_id *ids)
 202 {
 203         struct pcf50633 *pcf;
 204         struct pcf50633_platform_data *pdata = client->dev.platform_data;
 205         int i, ret;
 206         int version, variant;
 207
 208         if (!client->irq) {
 209                 dev_err(&client->dev, "Missing IRQ\n");
 210                 return -ENOENT;
 211         }
 212
 213         pcf = kzalloc(sizeof(*pcf), GFP_KERNEL);
 214         if (!pcf)
 215                 return -ENOMEM;
 216
 217         pcf->pdata = pdata;
 218
 219         mutex_init(&pcf->lock);
 220
 221         pcf->regmap = regmap_init_i2c(client, &pcf50633_regmap_config);
 222         if (IS_ERR(pcf->regmap)) {
 223                 ret = PTR_ERR(pcf->regmap);
 224                 dev_err(pcf->dev, "Failed to allocate register map: %d\n",
 225                         ret);
 226                 goto err_free;
 227         }
 228
 229         i2c_set_clientdata(client, pcf);
 230         pcf->dev = &client->dev;
 231
 232         version = pcf50633_reg_read(pcf, 0);
 233         variant = pcf50633_reg_read(pcf, 1);
 234         if (version < 0 || variant < 0) {
 235                 dev_err(pcf->dev, "Unable to probe pcf50633\n");
 236                 ret = -ENODEV;
 237                 goto err_regmap;
 238         }
 239
 240         dev_info(pcf->dev, "Probed device version %d variant %d\n",
 241                                                         version, variant);
 242
 243         pcf50633_irq_init(pcf, client->irq);
 244
 245         /* Create sub devices */
 246         pcf50633_client_dev_register(pcf, "pcf50633-input",
 247                                                 &pcf->input_pdev);
 248         pcf50633_client_dev_register(pcf, "pcf50633-rtc",
 249                                                 &pcf->rtc_pdev);
 250         pcf50633_client_dev_register(pcf, "pcf50633-mbc",
 251                                                 &pcf->mbc_pdev);
 252         pcf50633_client_dev_register(pcf, "pcf50633-adc",
 253                                                 &pcf->adc_pdev);
 254         pcf50633_client_dev_register(pcf, "pcf50633-backlight",
 255                                                 &pcf->bl_pdev);
 256
 257
 258         for (i = 0; i < PCF50633_NUM_REGULATORS; i++) {
 259                 struct platform_device *pdev;
 260
 261                 pdev = platform_device_alloc("pcf50633-regltr", i);
 262                 if (!pdev) {
 263                         dev_err(pcf->dev, "Cannot create regulator %d\n", i);
 264                         continue;
 265                 }
 266
 267                 pdev->dev.parent = pcf->dev;
 268                 platform_device_add_data(pdev, &pdata->reg_init_data[i],
 269                                         sizeof(pdata->reg_init_data[i]));
 270                 pcf->regulator_pdev[i] = pdev;
 271
 272                 platform_device_add(pdev);
 273         }
 274
 275         ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group);
 276         if (ret)
 277                 dev_err(pcf->dev, "error creating sysfs entries\n");
 278
 279         if (pdata->probe_done)
 280                 pdata->probe_done(pcf);
 281
 282         return 0;
 283
 284 err_regmap:
 285         regmap_exit(pcf->regmap);
 286 err_free:
 287         kfree(pcf);
 288
 289         return ret;
 290 }
 291
 292 static int __devexit pcf50633_remove(struct i2c_client *client)
 293 {
 294         struct pcf50633 *pcf = i2c_get_clientdata(client);
 295         int i;
 296
 297         sysfs_remove_group(&client->dev.kobj, &pcf_attr_group);
 298         pcf50633_irq_free(pcf);
 299
 300         platform_device_unregister(pcf->input_pdev);
 301         platform_device_unregister(pcf->rtc_pdev);
 302         platform_device_unregister(pcf->mbc_pdev);
 303         platform_device_unregister(pcf->adc_pdev);
 304         platform_device_unregister(pcf->bl_pdev);
 305
 306         for (i = 0; i < PCF50633_NUM_REGULATORS; i++)
 307                 platform_device_unregister(pcf->regulator_pdev[i]);
 308
 309         regmap_exit(pcf->regmap);
 310         kfree(pcf);
 311
 312         return 0;
 313 }
 314
 315 static const struct i2c_device_id pcf50633_id_table[] = {
 316         {"pcf50633", 0x73},
 317         {/* end of list */}
 318 };
 319 MODULE_DEVICE_TABLE(i2c, pcf50633_id_table);
 320
 321 static struct i2c_driver pcf50633_driver = {
 322         .driver = {
 323                 .name   = "pcf50633",
 324                 .pm     = &pcf50633_pm,
 325         },
 326         .id_table = pcf50633_id_table,
 327         .probe = pcf50633_probe,
 328         .remove = __devexit_p(pcf50633_remove),
 329 };
 330
 331 static int __init pcf50633_init(void)
 332 {
 333         return i2c_add_driver(&pcf50633_driver);
 334 }
 335
 336 static void __exit pcf50633_exit(void)
 337 {
 338         i2c_del_driver(&pcf50633_driver);
 339 }
 340
 341 MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU");
 342 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
 343 MODULE_LICENSE("GPL");
 344
 345 subsys_initcall(pcf50633_init);
 346 module_exit(pcf50633_exit);