linux/drivers/mfd/max8907.c
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   1/*
   2 * max8907.c - mfd driver for MAX8907
   3 *
   4 * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>
   5 * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved.
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 */
  11
  12#include <linux/err.h>
  13#include <linux/i2c.h>
  14#include <linux/init.h>
  15#include <linux/interrupt.h>
  16#include <linux/irq.h>
  17#include <linux/mfd/core.h>
  18#include <linux/mfd/max8907.h>
  19#include <linux/module.h>
  20#include <linux/of_device.h>
  21#include <linux/regmap.h>
  22#include <linux/slab.h>
  23
  24static struct mfd_cell max8907_cells[] = {
  25        { .name = "max8907-regulator", },
  26        { .name = "max8907-rtc", },
  27};
  28
  29static bool max8907_gen_is_volatile_reg(struct device *dev, unsigned int reg)
  30{
  31        switch (reg) {
  32        case MAX8907_REG_ON_OFF_IRQ1:
  33        case MAX8907_REG_ON_OFF_STAT:
  34        case MAX8907_REG_ON_OFF_IRQ2:
  35        case MAX8907_REG_CHG_IRQ1:
  36        case MAX8907_REG_CHG_IRQ2:
  37        case MAX8907_REG_CHG_STAT:
  38                return true;
  39        default:
  40                return false;
  41        }
  42}
  43
  44static bool max8907_gen_is_precious_reg(struct device *dev, unsigned int reg)
  45{
  46        switch (reg) {
  47        case MAX8907_REG_ON_OFF_IRQ1:
  48        case MAX8907_REG_ON_OFF_IRQ2:
  49        case MAX8907_REG_CHG_IRQ1:
  50        case MAX8907_REG_CHG_IRQ2:
  51                return true;
  52        default:
  53                return false;
  54        }
  55}
  56
  57static bool max8907_gen_is_writeable_reg(struct device *dev, unsigned int reg)
  58{
  59        return !max8907_gen_is_volatile_reg(dev, reg);
  60}
  61
  62static const struct regmap_config max8907_regmap_gen_config = {
  63        .reg_bits = 8,
  64        .val_bits = 8,
  65        .volatile_reg = max8907_gen_is_volatile_reg,
  66        .precious_reg = max8907_gen_is_precious_reg,
  67        .writeable_reg = max8907_gen_is_writeable_reg,
  68        .max_register = MAX8907_REG_LDO20VOUT,
  69        .cache_type = REGCACHE_RBTREE,
  70};
  71
  72static bool max8907_rtc_is_volatile_reg(struct device *dev, unsigned int reg)
  73{
  74        if (reg <= MAX8907_REG_RTC_YEAR2)
  75                return true;
  76
  77        switch (reg) {
  78        case MAX8907_REG_RTC_STATUS:
  79        case MAX8907_REG_RTC_IRQ:
  80                return true;
  81        default:
  82                return false;
  83        }
  84}
  85
  86static bool max8907_rtc_is_precious_reg(struct device *dev, unsigned int reg)
  87{
  88        switch (reg) {
  89        case MAX8907_REG_RTC_IRQ:
  90                return true;
  91        default:
  92                return false;
  93        }
  94}
  95
  96static bool max8907_rtc_is_writeable_reg(struct device *dev, unsigned int reg)
  97{
  98        switch (reg) {
  99        case MAX8907_REG_RTC_STATUS:
 100        case MAX8907_REG_RTC_IRQ:
 101                return false;
 102        default:
 103                return true;
 104        }
 105}
 106
 107static const struct regmap_config max8907_regmap_rtc_config = {
 108        .reg_bits = 8,
 109        .val_bits = 8,
 110        .volatile_reg = max8907_rtc_is_volatile_reg,
 111        .precious_reg = max8907_rtc_is_precious_reg,
 112        .writeable_reg = max8907_rtc_is_writeable_reg,
 113        .max_register = MAX8907_REG_MPL_CNTL,
 114        .cache_type = REGCACHE_RBTREE,
 115};
 116
 117static const struct regmap_irq max8907_chg_irqs[] = {
 118        { .reg_offset = 0, .mask = 1 << 0, },
 119        { .reg_offset = 0, .mask = 1 << 1, },
 120        { .reg_offset = 0, .mask = 1 << 2, },
 121        { .reg_offset = 1, .mask = 1 << 0, },
 122        { .reg_offset = 1, .mask = 1 << 1, },
 123        { .reg_offset = 1, .mask = 1 << 2, },
 124        { .reg_offset = 1, .mask = 1 << 3, },
 125        { .reg_offset = 1, .mask = 1 << 4, },
 126        { .reg_offset = 1, .mask = 1 << 5, },
 127        { .reg_offset = 1, .mask = 1 << 6, },
 128        { .reg_offset = 1, .mask = 1 << 7, },
 129};
 130
 131static const struct regmap_irq_chip max8907_chg_irq_chip = {
 132        .name = "max8907 chg",
 133        .status_base = MAX8907_REG_CHG_IRQ1,
 134        .mask_base = MAX8907_REG_CHG_IRQ1_MASK,
 135        .wake_base = MAX8907_REG_CHG_IRQ1_MASK,
 136        .irq_reg_stride = MAX8907_REG_CHG_IRQ2 - MAX8907_REG_CHG_IRQ1,
 137        .num_regs = 2,
 138        .irqs = max8907_chg_irqs,
 139        .num_irqs = ARRAY_SIZE(max8907_chg_irqs),
 140};
 141
 142static const struct regmap_irq max8907_on_off_irqs[] = {
 143        { .reg_offset = 0, .mask = 1 << 0, },
 144        { .reg_offset = 0, .mask = 1 << 1, },
 145        { .reg_offset = 0, .mask = 1 << 2, },
 146        { .reg_offset = 0, .mask = 1 << 3, },
 147        { .reg_offset = 0, .mask = 1 << 4, },
 148        { .reg_offset = 0, .mask = 1 << 5, },
 149        { .reg_offset = 0, .mask = 1 << 6, },
 150        { .reg_offset = 0, .mask = 1 << 7, },
 151        { .reg_offset = 1, .mask = 1 << 0, },
 152        { .reg_offset = 1, .mask = 1 << 1, },
 153};
 154
 155static const struct regmap_irq_chip max8907_on_off_irq_chip = {
 156        .name = "max8907 on_off",
 157        .status_base = MAX8907_REG_ON_OFF_IRQ1,
 158        .mask_base = MAX8907_REG_ON_OFF_IRQ1_MASK,
 159        .irq_reg_stride = MAX8907_REG_ON_OFF_IRQ2 - MAX8907_REG_ON_OFF_IRQ1,
 160        .num_regs = 2,
 161        .irqs = max8907_on_off_irqs,
 162        .num_irqs = ARRAY_SIZE(max8907_on_off_irqs),
 163};
 164
 165static const struct regmap_irq max8907_rtc_irqs[] = {
 166        { .reg_offset = 0, .mask = 1 << 2, },
 167        { .reg_offset = 0, .mask = 1 << 3, },
 168};
 169
 170static const struct regmap_irq_chip max8907_rtc_irq_chip = {
 171        .name = "max8907 rtc",
 172        .status_base = MAX8907_REG_RTC_IRQ,
 173        .mask_base = MAX8907_REG_RTC_IRQ_MASK,
 174        .num_regs = 1,
 175        .irqs = max8907_rtc_irqs,
 176        .num_irqs = ARRAY_SIZE(max8907_rtc_irqs),
 177};
 178
 179static struct max8907 *max8907_pm_off;
 180static void max8907_power_off(void)
 181{
 182        regmap_update_bits(max8907_pm_off->regmap_gen, MAX8907_REG_RESET_CNFG,
 183                        MAX8907_MASK_POWER_OFF, MAX8907_MASK_POWER_OFF);
 184}
 185
 186static int max8907_i2c_probe(struct i2c_client *i2c,
 187                                       const struct i2c_device_id *id)
 188{
 189        struct max8907 *max8907;
 190        int ret;
 191        struct max8907_platform_data *pdata = dev_get_platdata(&i2c->dev);
 192        bool pm_off = false;
 193
 194        if (pdata)
 195                pm_off = pdata->pm_off;
 196        else if (i2c->dev.of_node)
 197                pm_off = of_property_read_bool(i2c->dev.of_node,
 198                                        "maxim,system-power-controller");
 199
 200        max8907 = devm_kzalloc(&i2c->dev, sizeof(struct max8907), GFP_KERNEL);
 201        if (!max8907) {
 202                ret = -ENOMEM;
 203                goto err_alloc_drvdata;
 204        }
 205
 206        max8907->dev = &i2c->dev;
 207        dev_set_drvdata(max8907->dev, max8907);
 208
 209        max8907->i2c_gen = i2c;
 210        i2c_set_clientdata(i2c, max8907);
 211        max8907->regmap_gen = devm_regmap_init_i2c(i2c,
 212                                                &max8907_regmap_gen_config);
 213        if (IS_ERR(max8907->regmap_gen)) {
 214                ret = PTR_ERR(max8907->regmap_gen);
 215                dev_err(&i2c->dev, "gen regmap init failed: %d\n", ret);
 216                goto err_regmap_gen;
 217        }
 218
 219        max8907->i2c_rtc = i2c_new_dummy(i2c->adapter, MAX8907_RTC_I2C_ADDR);
 220        if (!max8907->i2c_rtc) {
 221                ret = -ENOMEM;
 222                goto err_dummy_rtc;
 223        }
 224        i2c_set_clientdata(max8907->i2c_rtc, max8907);
 225        max8907->regmap_rtc = devm_regmap_init_i2c(max8907->i2c_rtc,
 226                                                &max8907_regmap_rtc_config);
 227        if (IS_ERR(max8907->regmap_rtc)) {
 228                ret = PTR_ERR(max8907->regmap_rtc);
 229                dev_err(&i2c->dev, "rtc regmap init failed: %d\n", ret);
 230                goto err_regmap_rtc;
 231        }
 232
 233        irq_set_status_flags(max8907->i2c_gen->irq, IRQ_NOAUTOEN);
 234
 235        ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
 236                                  IRQF_ONESHOT | IRQF_SHARED, -1,
 237                                  &max8907_chg_irq_chip,
 238                                  &max8907->irqc_chg);
 239        if (ret != 0) {
 240                dev_err(&i2c->dev, "failed to add chg irq chip: %d\n", ret);
 241                goto err_irqc_chg;
 242        }
 243        ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
 244                                  IRQF_ONESHOT | IRQF_SHARED, -1,
 245                                  &max8907_on_off_irq_chip,
 246                                  &max8907->irqc_on_off);
 247        if (ret != 0) {
 248                dev_err(&i2c->dev, "failed to add on off irq chip: %d\n", ret);
 249                goto err_irqc_on_off;
 250        }
 251        ret = regmap_add_irq_chip(max8907->regmap_rtc, max8907->i2c_gen->irq,
 252                                  IRQF_ONESHOT | IRQF_SHARED, -1,
 253                                  &max8907_rtc_irq_chip,
 254                                  &max8907->irqc_rtc);
 255        if (ret != 0) {
 256                dev_err(&i2c->dev, "failed to add rtc irq chip: %d\n", ret);
 257                goto err_irqc_rtc;
 258        }
 259
 260        enable_irq(max8907->i2c_gen->irq);
 261
 262        ret = mfd_add_devices(max8907->dev, -1, max8907_cells,
 263                              ARRAY_SIZE(max8907_cells), NULL, 0, NULL);
 264        if (ret != 0) {
 265                dev_err(&i2c->dev, "failed to add MFD devices %d\n", ret);
 266                goto err_add_devices;
 267        }
 268
 269        if (pm_off && !pm_power_off) {
 270                max8907_pm_off = max8907;
 271                pm_power_off = max8907_power_off;
 272        }
 273
 274        return 0;
 275
 276err_add_devices:
 277        regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
 278err_irqc_rtc:
 279        regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
 280err_irqc_on_off:
 281        regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
 282err_irqc_chg:
 283err_regmap_rtc:
 284        i2c_unregister_device(max8907->i2c_rtc);
 285err_dummy_rtc:
 286err_regmap_gen:
 287err_alloc_drvdata:
 288        return ret;
 289}
 290
 291static int max8907_i2c_remove(struct i2c_client *i2c)
 292{
 293        struct max8907 *max8907 = i2c_get_clientdata(i2c);
 294
 295        mfd_remove_devices(max8907->dev);
 296
 297        regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
 298        regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
 299        regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
 300
 301        i2c_unregister_device(max8907->i2c_rtc);
 302
 303        return 0;
 304}
 305
 306#ifdef CONFIG_OF
 307static struct of_device_id max8907_of_match[] = {
 308        { .compatible = "maxim,max8907" },
 309        { },
 310};
 311MODULE_DEVICE_TABLE(of, max8907_of_match);
 312#endif
 313
 314static const struct i2c_device_id max8907_i2c_id[] = {
 315        {"max8907", 0},
 316        {}
 317};
 318MODULE_DEVICE_TABLE(i2c, max8907_i2c_id);
 319
 320static struct i2c_driver max8907_i2c_driver = {
 321        .driver = {
 322                .name = "max8907",
 323                .owner = THIS_MODULE,
 324                .of_match_table = of_match_ptr(max8907_of_match),
 325        },
 326        .probe = max8907_i2c_probe,
 327        .remove = max8907_i2c_remove,
 328        .id_table = max8907_i2c_id,
 329};
 330
 331static int __init max8907_i2c_init(void)
 332{
 333        int ret = -ENODEV;
 334
 335        ret = i2c_add_driver(&max8907_i2c_driver);
 336        if (ret != 0)
 337                pr_err("Failed to register I2C driver: %d\n", ret);
 338
 339        return ret;
 340}
 341subsys_initcall(max8907_i2c_init);
 342
 343static void __exit max8907_i2c_exit(void)
 344{
 345        i2c_del_driver(&max8907_i2c_driver);
 346}
 347module_exit(max8907_i2c_exit);
 348
 349MODULE_DESCRIPTION("MAX8907 multi-function core driver");
 350MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
 351MODULE_LICENSE("GPL v2");
 352
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