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                 hex_dump_to_buffer(dump, sizeof(dump), 16, 1, buf1, 128, 0);
 110                 buf1 += strlen(buf1);
 111                 *buf1++ = '\n';
 112                 *buf1 = '\0';
 113         }
 114
 115         return buf1 - buf;
 116 }
 117 static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL);
 118
 119 static ssize_t show_resume_reason(struct device *dev,
 120                                 struct device_attribute *attr, char *buf)
 121 {
 122         struct pcf50633 *pcf = dev_get_drvdata(dev);
 123         int n;
 124
 125         n = sprintf(buf, "%02x%02x%02x%02x%02x\n",
 126                                 pcf->resume_reason[0],
 127                                 pcf->resume_reason[1],
 128                                 pcf->resume_reason[2],
 129                                 pcf->resume_reason[3],
 130                                 pcf->resume_reason[4]);
 131
 132         return n;
 133 }
 134 static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL);
 135
 136 static struct attribute *pcf_sysfs_entries[] = {
 137         &dev_attr_dump_regs.attr,
 138         &dev_attr_resume_reason.attr,
 139         NULL,
 140 };
 141
 142 static struct attribute_group pcf_attr_group = {
 143         .name   = NULL,                 /* put in device directory */
 144         .attrs  = pcf_sysfs_entries,
 145 };
 146
 147 static void
 148 pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name,
 149                                                 struct platform_device **pdev)
 150 {
 151         int ret;
 152
 153         *pdev = platform_device_alloc(name, -1);
 154         if (!*pdev) {
 155                 dev_err(pcf->dev, "Falied to allocate %s\n", name);
 156                 return;
 157         }
 158
 159         (*pdev)->dev.parent = pcf->dev;
 160
 161         ret = platform_device_add(*pdev);
 162         if (ret) {
 163                 dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret);
 164                 platform_device_put(*pdev);
 165                 *pdev = NULL;
 166         }
 167 }
 168
 169 #ifdef CONFIG_PM_SLEEP
 170 static int pcf50633_suspend(struct device *dev)
 171 {
 172         struct i2c_client *client = to_i2c_client(dev);
 173         struct pcf50633 *pcf = i2c_get_clientdata(client);
 174
 175         return pcf50633_irq_suspend(pcf);
 176 }
 177
 178 static int pcf50633_resume(struct device *dev)
 179 {
 180         struct i2c_client *client = to_i2c_client(dev);
 181         struct pcf50633 *pcf = i2c_get_clientdata(client);
 182
 183         return pcf50633_irq_resume(pcf);
 184 }
 185 #endif
 186
 187 static SIMPLE_DEV_PM_OPS(pcf50633_pm, pcf50633_suspend, pcf50633_resume);
 188
 189 static struct regmap_config pcf50633_regmap_config = {
 190         .reg_bits = 8,
 191         .val_bits = 8,
 192 };
 193
 194 static int pcf50633_probe(struct i2c_client *client,
 195                                 const struct i2c_device_id *ids)
 196 {
 197         struct pcf50633 *pcf;
 198         struct pcf50633_platform_data *pdata = client->dev.platform_data;
 199         int i, ret;
 200         int version, variant;
 201
 202         if (!client->irq) {
 203                 dev_err(&client->dev, "Missing IRQ\n");
 204                 return -ENOENT;
 205         }
 206
 207         pcf = devm_kzalloc(&client->dev, sizeof(*pcf), GFP_KERNEL);
 208         if (!pcf)
 209                 return -ENOMEM;
 210
 211         i2c_set_clientdata(client, pcf);
 212         pcf->dev = &client->dev;
 213         pcf->pdata = pdata;
 214
 215         mutex_init(&pcf->lock);
 216
 217         pcf->regmap = devm_regmap_init_i2c(client, &pcf50633_regmap_config);
 218         if (IS_ERR(pcf->regmap)) {
 219                 ret = PTR_ERR(pcf->regmap);
 220                 dev_err(pcf->dev, "Failed to allocate register map: %d\n", ret);
 221                 return ret;
 222         }
 223
 224         version = pcf50633_reg_read(pcf, 0);
 225         variant = pcf50633_reg_read(pcf, 1);
 226         if (version < 0 || variant < 0) {
 227                 dev_err(pcf->dev, "Unable to probe pcf50633\n");
 228                 ret = -ENODEV;
 229                 return ret;
 230         }
 231
 232         dev_info(pcf->dev, "Probed device version %d variant %d\n",
 233                                                         version, variant);
 234
 235         pcf50633_irq_init(pcf, client->irq);
 236
 237         /* Create sub devices */
 238         pcf50633_client_dev_register(pcf, "pcf50633-input", &pcf->input_pdev);
 239         pcf50633_client_dev_register(pcf, "pcf50633-rtc", &pcf->rtc_pdev);
 240         pcf50633_client_dev_register(pcf, "pcf50633-mbc", &pcf->mbc_pdev);
 241         pcf50633_client_dev_register(pcf, "pcf50633-adc", &pcf->adc_pdev);
 242         pcf50633_client_dev_register(pcf, "pcf50633-backlight", &pcf->bl_pdev);
 243
 244
 245         for (i = 0; i < PCF50633_NUM_REGULATORS; i++) {
 246                 struct platform_device *pdev;
 247
 248                 pdev = platform_device_alloc("pcf50633-regltr", i);
 249                 if (!pdev) {
 250                         dev_err(pcf->dev, "Cannot create regulator %d\n", i);
 251                         continue;
 252                 }
 253
 254                 pdev->dev.parent = pcf->dev;
 255                 if (platform_device_add_data(pdev, &pdata->reg_init_data[i],
 256                                         sizeof(pdata->reg_init_data[i])) < 0) {
 257                         platform_device_put(pdev);
 258                         dev_err(pcf->dev, "Out of memory for regulator parameters %d\n",
 259                                                                         i);
 260                         continue;
 261                 }
 262                 pcf->regulator_pdev[i] = pdev;
 263
 264                 platform_device_add(pdev);
 265         }
 266
 267         ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group);
 268         if (ret)
 269                 dev_err(pcf->dev, "error creating sysfs entries\n");
 270
 271         if (pdata->probe_done)
 272                 pdata->probe_done(pcf);
 273
 274         return 0;
 275 }
 276
 277 static int pcf50633_remove(struct i2c_client *client)
 278 {
 279         struct pcf50633 *pcf = i2c_get_clientdata(client);
 280         int i;
 281
 282         sysfs_remove_group(&client->dev.kobj, &pcf_attr_group);
 283         pcf50633_irq_free(pcf);
 284
 285         platform_device_unregister(pcf->input_pdev);
 286         platform_device_unregister(pcf->rtc_pdev);
 287         platform_device_unregister(pcf->mbc_pdev);
 288         platform_device_unregister(pcf->adc_pdev);
 289         platform_device_unregister(pcf->bl_pdev);
 290
 291         for (i = 0; i < PCF50633_NUM_REGULATORS; i++)
 292                 platform_device_unregister(pcf->regulator_pdev[i]);
 293
 294         return 0;
 295 }
 296
 297 static const struct i2c_device_id pcf50633_id_table[] = {
 298         {"pcf50633", 0x73},
 299         {/* end of list */}
 300 };
 301 MODULE_DEVICE_TABLE(i2c, pcf50633_id_table);
 302
 303 static struct i2c_driver pcf50633_driver = {
 304         .driver = {
 305                 .name   = "pcf50633",
 306                 .pm     = &pcf50633_pm,
 307         },
 308         .id_table = pcf50633_id_table,
 309         .probe = pcf50633_probe,
 310         .remove = pcf50633_remove,
 311 };
 312
 313 static int __init pcf50633_init(void)
 314 {
 315         return i2c_add_driver(&pcf50633_driver);
 316 }
 317
 318 static void __exit pcf50633_exit(void)
 319 {
 320         i2c_del_driver(&pcf50633_driver);
 321 }
 322
 323 MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU");
 324 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
 325 MODULE_LICENSE("GPL");
 326
 327 subsys_initcall(pcf50633_init);
 328 module_exit(pcf50633_exit);