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