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         return regmap_raw_write(pcf->regmap, reg, data, nr_regs);
  50 }
  51 EXPORT_SYMBOL_GPL(pcf50633_write_block);
  52
  53 u8 pcf50633_reg_read(struct pcf50633 *pcf, u8 reg)
  54 {
  55         unsigned int val;
  56         int ret;
  57
  58         ret = regmap_read(pcf->regmap, reg, &val);
  59         if (ret < 0)
  60                 return -1;
  61
  62         return val;
  63 }
  64 EXPORT_SYMBOL_GPL(pcf50633_reg_read);
  65
  66 int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val)
  67 {
  68         return regmap_write(pcf->regmap, reg, val);
  69 }
  70 EXPORT_SYMBOL_GPL(pcf50633_reg_write);
  71
  72 int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val)
  73 {
  74         return regmap_update_bits(pcf->regmap, reg, mask, val);
  75 }
  76 EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask);
  77
  78 int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val)
  79 {
  80         return regmap_update_bits(pcf->regmap, reg, val, 0);
  81 }
  82 EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits);
  83
  84 /* sysfs attributes */
  85 static ssize_t show_dump_regs(struct device *dev, struct device_attribute *attr,
  86                             char *buf)
  87 {
  88         struct pcf50633 *pcf = dev_get_drvdata(dev);
  89         u8 dump[16];
  90         int n, n1, idx = 0;
  91         char *buf1 = buf;
  92         static u8 address_no_read[] = { /* must be ascending */
  93                 PCF50633_REG_INT1,
  94                 PCF50633_REG_INT2,
  95                 PCF50633_REG_INT3,
  96                 PCF50633_REG_INT4,
  97                 PCF50633_REG_INT5,
  98                 0 /* terminator */
  99         };
 100
 101         for (n = 0; n < 256; n += sizeof(dump)) {
 102                 for (n1 = 0; n1 < sizeof(dump); n1++)
 103                         if (n == address_no_read[idx]) {
 104                                 idx++;
 105                                 dump[n1] = 0x00;
 106                         } else
 107                                 dump[n1] = pcf50633_reg_read(pcf, n + n1);
 108
 109                 buf1 += sprintf(buf1, "%*ph\n", (int)sizeof(dump), dump);
 110         }
 111
 112         return buf1 - buf;
 113 }
 114 static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL);
 115
 116 static ssize_t show_resume_reason(struct device *dev,
 117                                 struct device_attribute *attr, char *buf)
 118 {
 119         struct pcf50633 *pcf = dev_get_drvdata(dev);
 120         int n;
 121
 122         n = sprintf(buf, "%02x%02x%02x%02x%02x\n",
 123                                 pcf->resume_reason[0],
 124                                 pcf->resume_reason[1],
 125                                 pcf->resume_reason[2],
 126                                 pcf->resume_reason[3],
 127                                 pcf->resume_reason[4]);
 128
 129         return n;
 130 }
 131 static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL);
 132
 133 static struct attribute *pcf_sysfs_entries[] = {
 134         &dev_attr_dump_regs.attr,
 135         &dev_attr_resume_reason.attr,
 136         NULL,
 137 };
 138
 139 static struct attribute_group pcf_attr_group = {
 140         .name   = NULL,                 /* put in device directory */
 141         .attrs  = pcf_sysfs_entries,
 142 };
 143
 144 static void
 145 pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name,
 146                                                 struct platform_device **pdev)
 147 {
 148         int ret;
 149
 150         *pdev = platform_device_alloc(name, -1);
 151         if (!*pdev) {
 152                 dev_err(pcf->dev, "Failed to allocate %s\n", name);
 153                 return;
 154         }
 155
 156         (*pdev)->dev.parent = pcf->dev;
 157
 158         ret = platform_device_add(*pdev);
 159         if (ret) {
 160                 dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret);
 161                 platform_device_put(*pdev);
 162                 *pdev = NULL;
 163         }
 164 }
 165
 166 #ifdef CONFIG_PM_SLEEP
 167 static int pcf50633_suspend(struct device *dev)
 168 {
 169         struct i2c_client *client = to_i2c_client(dev);
 170         struct pcf50633 *pcf = i2c_get_clientdata(client);
 171
 172         return pcf50633_irq_suspend(pcf);
 173 }
 174
 175 static int pcf50633_resume(struct device *dev)
 176 {
 177         struct i2c_client *client = to_i2c_client(dev);
 178         struct pcf50633 *pcf = i2c_get_clientdata(client);
 179
 180         return pcf50633_irq_resume(pcf);
 181 }
 182 #endif
 183
 184 static SIMPLE_DEV_PM_OPS(pcf50633_pm, pcf50633_suspend, pcf50633_resume);
 185
 186 static const struct regmap_config pcf50633_regmap_config = {
 187         .reg_bits = 8,
 188         .val_bits = 8,
 189 };
 190
 191 static int pcf50633_probe(struct i2c_client *client,
 192                                 const struct i2c_device_id *ids)
 193 {
 194         struct pcf50633 *pcf;
 195         struct platform_device *pdev;
 196         struct pcf50633_platform_data *pdata = dev_get_platdata(&client->dev);
 197         int i, j, ret;
 198         int version, variant;
 199
 200         if (!client->irq) {
 201                 dev_err(&client->dev, "Missing IRQ\n");
 202                 return -ENOENT;
 203         }
 204
 205         pcf = devm_kzalloc(&client->dev, sizeof(*pcf), GFP_KERNEL);
 206         if (!pcf)
 207                 return -ENOMEM;
 208
 209         i2c_set_clientdata(client, pcf);
 210         pcf->dev = &client->dev;
 211         pcf->pdata = pdata;
 212
 213         mutex_init(&pcf->lock);
 214
 215         pcf->regmap = devm_regmap_init_i2c(client, &pcf50633_regmap_config);
 216         if (IS_ERR(pcf->regmap)) {
 217                 ret = PTR_ERR(pcf->regmap);
 218                 dev_err(pcf->dev, "Failed to allocate register map: %d\n", ret);
 219                 return ret;
 220         }
 221
 222         version = pcf50633_reg_read(pcf, 0);
 223         variant = pcf50633_reg_read(pcf, 1);
 224         if (version < 0 || variant < 0) {
 225                 dev_err(pcf->dev, "Unable to probe pcf50633\n");
 226                 ret = -ENODEV;
 227                 return ret;
 228         }
 229
 230         dev_info(pcf->dev, "Probed device version %d variant %d\n",
 231                                                         version, variant);
 232
 233         pcf50633_irq_init(pcf, client->irq);
 234
 235         /* Create sub devices */
 236         pcf50633_client_dev_register(pcf, "pcf50633-input", &pcf->input_pdev);
 237         pcf50633_client_dev_register(pcf, "pcf50633-rtc", &pcf->rtc_pdev);
 238         pcf50633_client_dev_register(pcf, "pcf50633-mbc", &pcf->mbc_pdev);
 239         pcf50633_client_dev_register(pcf, "pcf50633-adc", &pcf->adc_pdev);
 240         pcf50633_client_dev_register(pcf, "pcf50633-backlight", &pcf->bl_pdev);
 241
 242
 243         for (i = 0; i < PCF50633_NUM_REGULATORS; i++) {
 244                 pdev = platform_device_alloc("pcf50633-regulator", i);
 245                 if (!pdev)
 246                         return -ENOMEM;
 247
 248                 pdev->dev.parent = pcf->dev;
 249                 ret = platform_device_add_data(pdev, &pdata->reg_init_data[i],
 250                                                sizeof(pdata->reg_init_data[i]));
 251                 if (ret)
 252                         goto err;
 253
 254                 ret = platform_device_add(pdev);
 255                 if (ret)
 256                         goto err;
 257
 258                 pcf->regulator_pdev[i] = pdev;
 259         }
 260
 261         ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group);
 262         if (ret)
 263                 dev_warn(pcf->dev, "error creating sysfs entries\n");
 264
 265         if (pdata->probe_done)
 266                 pdata->probe_done(pcf);
 267
 268         return 0;
 269
 270 err:
 271         platform_device_put(pdev);
 272         for (j = 0; j < i; j++)
 273                 platform_device_put(pcf->regulator_pdev[j]);
 274
 275         return ret;
 276 }
 277
 278 static int pcf50633_remove(struct i2c_client *client)
 279 {
 280         struct pcf50633 *pcf = i2c_get_clientdata(client);
 281         int i;
 282
 283         sysfs_remove_group(&client->dev.kobj, &pcf_attr_group);
 284         pcf50633_irq_free(pcf);
 285
 286         platform_device_unregister(pcf->input_pdev);
 287         platform_device_unregister(pcf->rtc_pdev);
 288         platform_device_unregister(pcf->mbc_pdev);
 289         platform_device_unregister(pcf->adc_pdev);
 290         platform_device_unregister(pcf->bl_pdev);
 291
 292         for (i = 0; i < PCF50633_NUM_REGULATORS; i++)
 293                 platform_device_unregister(pcf->regulator_pdev[i]);
 294
 295         return 0;
 296 }
 297
 298 static const struct i2c_device_id pcf50633_id_table[] = {
 299         {"pcf50633", 0x73},
 300         {/* end of list */}
 301 };
 302 MODULE_DEVICE_TABLE(i2c, pcf50633_id_table);
 303
 304 static struct i2c_driver pcf50633_driver = {
 305         .driver = {
 306                 .name   = "pcf50633",
 307                 .pm     = &pcf50633_pm,
 308         },
 309         .id_table = pcf50633_id_table,
 310         .probe = pcf50633_probe,
 311         .remove = pcf50633_remove,
 312 };
 313
 314 static int __init pcf50633_init(void)
 315 {
 316         return i2c_add_driver(&pcf50633_driver);
 317 }
 318
 319 static void __exit pcf50633_exit(void)
 320 {
 321         i2c_del_driver(&pcf50633_driver);
 322 }
 323
 324 MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU");
 325 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
 326 MODULE_LICENSE("GPL");
 327
 328 subsys_initcall(pcf50633_init);
 329 module_exit(pcf50633_exit);