drivers/mfd/max8907.c

   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
  24 static struct mfd_cell max8907_cells[] = {
  25         { .name = "max8907-regulator", },
  26         { .name = "max8907-rtc", },
  27 };
  28
  29 static 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
  44 static 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
  57 static bool max8907_gen_is_writeable_reg(struct device *dev, unsigned int reg)
  58 {
  59         return !max8907_gen_is_volatile_reg(dev, reg);
  60 }
  61
  62 static 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
  72 static 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
  86 static 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
  96 static 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
 107 static 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
 117 static 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
 131 static 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
 142 static 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
 155 static 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
 165 static const struct regmap_irq max8907_rtc_irqs[] = {
 166         { .reg_offset = 0, .mask = 1 << 2, },
 167         { .reg_offset = 0, .mask = 1 << 3, },
 168 };
 169
 170 static 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
 179 static struct max8907 *max8907_pm_off;
 180 static 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
 186 static 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
 276 err_add_devices:
 277         regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
 278 err_irqc_rtc:
 279         regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
 280 err_irqc_on_off:
 281         regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
 282 err_irqc_chg:
 283 err_regmap_rtc:
 284         i2c_unregister_device(max8907->i2c_rtc);
 285 err_dummy_rtc:
 286 err_regmap_gen:
 287 err_alloc_drvdata:
 288         return ret;
 289 }
 290
 291 static 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
 307 static struct of_device_id max8907_of_match[] = {
 308         { .compatible = "maxim,max8907" },
 309         { },
 310 };
 311 MODULE_DEVICE_TABLE(of, max8907_of_match);
 312 #endif
 313
 314 static const struct i2c_device_id max8907_i2c_id[] = {
 315         {"max8907", 0},
 316         {}
 317 };
 318 MODULE_DEVICE_TABLE(i2c, max8907_i2c_id);
 319
 320 static 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
 331 static 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 }
 341 subsys_initcall(max8907_i2c_init);
 342
 343 static void __exit max8907_i2c_exit(void)
 344 {
 345         i2c_del_driver(&max8907_i2c_driver);
 346 }
 347 module_exit(max8907_i2c_exit);
 348
 349 MODULE_DESCRIPTION("MAX8907 multi-function core driver");
 350 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
 351 MODULE_LICENSE("GPL v2");