drivers/mfd/max8907.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * max8907.c - mfd driver for MAX8907
   4  *
   5  * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>
   6  * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved.
   7  */
   8
   9 #include <linux/err.h>
  10 #include <linux/i2c.h>
  11 #include <linux/init.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/irq.h>
  14 #include <linux/mfd/core.h>
  15 #include <linux/mfd/max8907.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/of_device.h>
  19 #include <linux/regmap.h>
  20 #include <linux/slab.h>
  21
  22 static const struct mfd_cell max8907_cells[] = {
  23         { .name = "max8907-regulator", },
  24         { .name = "max8907-rtc", },
  25 };
  26
  27 static bool max8907_gen_is_volatile_reg(struct device *dev, unsigned int reg)
  28 {
  29         switch (reg) {
  30         case MAX8907_REG_ON_OFF_IRQ1:
  31         case MAX8907_REG_ON_OFF_STAT:
  32         case MAX8907_REG_ON_OFF_IRQ2:
  33         case MAX8907_REG_CHG_IRQ1:
  34         case MAX8907_REG_CHG_IRQ2:
  35         case MAX8907_REG_CHG_STAT:
  36                 return true;
  37         default:
  38                 return false;
  39         }
  40 }
  41
  42 static bool max8907_gen_is_precious_reg(struct device *dev, unsigned int reg)
  43 {
  44         switch (reg) {
  45         case MAX8907_REG_ON_OFF_IRQ1:
  46         case MAX8907_REG_ON_OFF_IRQ2:
  47         case MAX8907_REG_CHG_IRQ1:
  48         case MAX8907_REG_CHG_IRQ2:
  49                 return true;
  50         default:
  51                 return false;
  52         }
  53 }
  54
  55 static bool max8907_gen_is_writeable_reg(struct device *dev, unsigned int reg)
  56 {
  57         return !max8907_gen_is_volatile_reg(dev, reg);
  58 }
  59
  60 static const struct regmap_config max8907_regmap_gen_config = {
  61         .reg_bits = 8,
  62         .val_bits = 8,
  63         .volatile_reg = max8907_gen_is_volatile_reg,
  64         .precious_reg = max8907_gen_is_precious_reg,
  65         .writeable_reg = max8907_gen_is_writeable_reg,
  66         .max_register = MAX8907_REG_LDO20VOUT,
  67         .cache_type = REGCACHE_RBTREE,
  68 };
  69
  70 static bool max8907_rtc_is_volatile_reg(struct device *dev, unsigned int reg)
  71 {
  72         if (reg <= MAX8907_REG_RTC_YEAR2)
  73                 return true;
  74
  75         switch (reg) {
  76         case MAX8907_REG_RTC_STATUS:
  77         case MAX8907_REG_RTC_IRQ:
  78                 return true;
  79         default:
  80                 return false;
  81         }
  82 }
  83
  84 static bool max8907_rtc_is_precious_reg(struct device *dev, unsigned int reg)
  85 {
  86         switch (reg) {
  87         case MAX8907_REG_RTC_IRQ:
  88                 return true;
  89         default:
  90                 return false;
  91         }
  92 }
  93
  94 static bool max8907_rtc_is_writeable_reg(struct device *dev, unsigned int reg)
  95 {
  96         switch (reg) {
  97         case MAX8907_REG_RTC_STATUS:
  98         case MAX8907_REG_RTC_IRQ:
  99                 return false;
 100         default:
 101                 return true;
 102         }
 103 }
 104
 105 static const struct regmap_config max8907_regmap_rtc_config = {
 106         .reg_bits = 8,
 107         .val_bits = 8,
 108         .volatile_reg = max8907_rtc_is_volatile_reg,
 109         .precious_reg = max8907_rtc_is_precious_reg,
 110         .writeable_reg = max8907_rtc_is_writeable_reg,
 111         .max_register = MAX8907_REG_MPL_CNTL,
 112         .cache_type = REGCACHE_RBTREE,
 113 };
 114
 115 static const struct regmap_irq max8907_chg_irqs[] = {
 116         { .reg_offset = 0, .mask = 1 << 0, },
 117         { .reg_offset = 0, .mask = 1 << 1, },
 118         { .reg_offset = 0, .mask = 1 << 2, },
 119         { .reg_offset = 1, .mask = 1 << 0, },
 120         { .reg_offset = 1, .mask = 1 << 1, },
 121         { .reg_offset = 1, .mask = 1 << 2, },
 122         { .reg_offset = 1, .mask = 1 << 3, },
 123         { .reg_offset = 1, .mask = 1 << 4, },
 124         { .reg_offset = 1, .mask = 1 << 5, },
 125         { .reg_offset = 1, .mask = 1 << 6, },
 126         { .reg_offset = 1, .mask = 1 << 7, },
 127 };
 128
 129 static const struct regmap_irq_chip max8907_chg_irq_chip = {
 130         .name = "max8907 chg",
 131         .status_base = MAX8907_REG_CHG_IRQ1,
 132         .mask_base = MAX8907_REG_CHG_IRQ1_MASK,
 133         .wake_base = MAX8907_REG_CHG_IRQ1_MASK,
 134         .irq_reg_stride = MAX8907_REG_CHG_IRQ2 - MAX8907_REG_CHG_IRQ1,
 135         .num_regs = 2,
 136         .irqs = max8907_chg_irqs,
 137         .num_irqs = ARRAY_SIZE(max8907_chg_irqs),
 138 };
 139
 140 static const struct regmap_irq max8907_on_off_irqs[] = {
 141         { .reg_offset = 0, .mask = 1 << 0, },
 142         { .reg_offset = 0, .mask = 1 << 1, },
 143         { .reg_offset = 0, .mask = 1 << 2, },
 144         { .reg_offset = 0, .mask = 1 << 3, },
 145         { .reg_offset = 0, .mask = 1 << 4, },
 146         { .reg_offset = 0, .mask = 1 << 5, },
 147         { .reg_offset = 0, .mask = 1 << 6, },
 148         { .reg_offset = 0, .mask = 1 << 7, },
 149         { .reg_offset = 1, .mask = 1 << 0, },
 150         { .reg_offset = 1, .mask = 1 << 1, },
 151 };
 152
 153 static const struct regmap_irq_chip max8907_on_off_irq_chip = {
 154         .name = "max8907 on_off",
 155         .status_base = MAX8907_REG_ON_OFF_IRQ1,
 156         .mask_base = MAX8907_REG_ON_OFF_IRQ1_MASK,
 157         .irq_reg_stride = MAX8907_REG_ON_OFF_IRQ2 - MAX8907_REG_ON_OFF_IRQ1,
 158         .num_regs = 2,
 159         .irqs = max8907_on_off_irqs,
 160         .num_irqs = ARRAY_SIZE(max8907_on_off_irqs),
 161 };
 162
 163 static const struct regmap_irq max8907_rtc_irqs[] = {
 164         { .reg_offset = 0, .mask = 1 << 2, },
 165         { .reg_offset = 0, .mask = 1 << 3, },
 166 };
 167
 168 static const struct regmap_irq_chip max8907_rtc_irq_chip = {
 169         .name = "max8907 rtc",
 170         .status_base = MAX8907_REG_RTC_IRQ,
 171         .mask_base = MAX8907_REG_RTC_IRQ_MASK,
 172         .num_regs = 1,
 173         .irqs = max8907_rtc_irqs,
 174         .num_irqs = ARRAY_SIZE(max8907_rtc_irqs),
 175 };
 176
 177 static struct max8907 *max8907_pm_off;
 178 static void max8907_power_off(void)
 179 {
 180         regmap_update_bits(max8907_pm_off->regmap_gen, MAX8907_REG_RESET_CNFG,
 181                         MAX8907_MASK_POWER_OFF, MAX8907_MASK_POWER_OFF);
 182 }
 183
 184 static int max8907_i2c_probe(struct i2c_client *i2c,
 185                                        const struct i2c_device_id *id)
 186 {
 187         struct max8907 *max8907;
 188         int ret;
 189         struct max8907_platform_data *pdata = dev_get_platdata(&i2c->dev);
 190         bool pm_off = false;
 191
 192         if (pdata)
 193                 pm_off = pdata->pm_off;
 194         else if (i2c->dev.of_node)
 195                 pm_off = of_property_read_bool(i2c->dev.of_node,
 196                                         "maxim,system-power-controller");
 197
 198         max8907 = devm_kzalloc(&i2c->dev, sizeof(struct max8907), GFP_KERNEL);
 199         if (!max8907) {
 200                 ret = -ENOMEM;
 201                 goto err_alloc_drvdata;
 202         }
 203
 204         max8907->dev = &i2c->dev;
 205         dev_set_drvdata(max8907->dev, max8907);
 206
 207         max8907->i2c_gen = i2c;
 208         i2c_set_clientdata(i2c, max8907);
 209         max8907->regmap_gen = devm_regmap_init_i2c(i2c,
 210                                                 &max8907_regmap_gen_config);
 211         if (IS_ERR(max8907->regmap_gen)) {
 212                 ret = PTR_ERR(max8907->regmap_gen);
 213                 dev_err(&i2c->dev, "gen regmap init failed: %d\n", ret);
 214                 goto err_regmap_gen;
 215         }
 216
 217         max8907->i2c_rtc = i2c_new_dummy_device(i2c->adapter, MAX8907_RTC_I2C_ADDR);
 218         if (IS_ERR(max8907->i2c_rtc)) {
 219                 ret = PTR_ERR(max8907->i2c_rtc);
 220                 goto err_dummy_rtc;
 221         }
 222         i2c_set_clientdata(max8907->i2c_rtc, max8907);
 223         max8907->regmap_rtc = devm_regmap_init_i2c(max8907->i2c_rtc,
 224                                                 &max8907_regmap_rtc_config);
 225         if (IS_ERR(max8907->regmap_rtc)) {
 226                 ret = PTR_ERR(max8907->regmap_rtc);
 227                 dev_err(&i2c->dev, "rtc regmap init failed: %d\n", ret);
 228                 goto err_regmap_rtc;
 229         }
 230
 231         irq_set_status_flags(max8907->i2c_gen->irq, IRQ_NOAUTOEN);
 232
 233         ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
 234                                   IRQF_ONESHOT | IRQF_SHARED, -1,
 235                                   &max8907_chg_irq_chip,
 236                                   &max8907->irqc_chg);
 237         if (ret != 0) {
 238                 dev_err(&i2c->dev, "failed to add chg irq chip: %d\n", ret);
 239                 goto err_irqc_chg;
 240         }
 241         ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
 242                                   IRQF_ONESHOT | IRQF_SHARED, -1,
 243                                   &max8907_on_off_irq_chip,
 244                                   &max8907->irqc_on_off);
 245         if (ret != 0) {
 246                 dev_err(&i2c->dev, "failed to add on off irq chip: %d\n", ret);
 247                 goto err_irqc_on_off;
 248         }
 249         ret = regmap_add_irq_chip(max8907->regmap_rtc, max8907->i2c_gen->irq,
 250                                   IRQF_ONESHOT | IRQF_SHARED, -1,
 251                                   &max8907_rtc_irq_chip,
 252                                   &max8907->irqc_rtc);
 253         if (ret != 0) {
 254                 dev_err(&i2c->dev, "failed to add rtc irq chip: %d\n", ret);
 255                 goto err_irqc_rtc;
 256         }
 257
 258         enable_irq(max8907->i2c_gen->irq);
 259
 260         ret = mfd_add_devices(max8907->dev, -1, max8907_cells,
 261                               ARRAY_SIZE(max8907_cells), NULL, 0, NULL);
 262         if (ret != 0) {
 263                 dev_err(&i2c->dev, "failed to add MFD devices %d\n", ret);
 264                 goto err_add_devices;
 265         }
 266
 267         if (pm_off && !pm_power_off) {
 268                 max8907_pm_off = max8907;
 269                 pm_power_off = max8907_power_off;
 270         }
 271
 272         return 0;
 273
 274 err_add_devices:
 275         regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
 276 err_irqc_rtc:
 277         regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
 278 err_irqc_on_off:
 279         regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
 280 err_irqc_chg:
 281 err_regmap_rtc:
 282         i2c_unregister_device(max8907->i2c_rtc);
 283 err_dummy_rtc:
 284 err_regmap_gen:
 285 err_alloc_drvdata:
 286         return ret;
 287 }
 288
 289 static int max8907_i2c_remove(struct i2c_client *i2c)
 290 {
 291         struct max8907 *max8907 = i2c_get_clientdata(i2c);
 292
 293         mfd_remove_devices(max8907->dev);
 294
 295         regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
 296         regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
 297         regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
 298
 299         i2c_unregister_device(max8907->i2c_rtc);
 300
 301         return 0;
 302 }
 303
 304 #ifdef CONFIG_OF
 305 static const struct of_device_id max8907_of_match[] = {
 306         { .compatible = "maxim,max8907" },
 307         { },
 308 };
 309 MODULE_DEVICE_TABLE(of, max8907_of_match);
 310 #endif
 311
 312 static const struct i2c_device_id max8907_i2c_id[] = {
 313         {"max8907", 0},
 314         {}
 315 };
 316 MODULE_DEVICE_TABLE(i2c, max8907_i2c_id);
 317
 318 static struct i2c_driver max8907_i2c_driver = {
 319         .driver = {
 320                 .name = "max8907",
 321                 .of_match_table = of_match_ptr(max8907_of_match),
 322         },
 323         .probe = max8907_i2c_probe,
 324         .remove = max8907_i2c_remove,
 325         .id_table = max8907_i2c_id,
 326 };
 327
 328 static int __init max8907_i2c_init(void)
 329 {
 330         int ret = -ENODEV;
 331
 332         ret = i2c_add_driver(&max8907_i2c_driver);
 333         if (ret != 0)
 334                 pr_err("Failed to register I2C driver: %d\n", ret);
 335
 336         return ret;
 337 }
 338 subsys_initcall(max8907_i2c_init);
 339
 340 static void __exit max8907_i2c_exit(void)
 341 {
 342         i2c_del_driver(&max8907_i2c_driver);
 343 }
 344 module_exit(max8907_i2c_exit);
 345
 346 MODULE_DESCRIPTION("MAX8907 multi-function core driver");
 347 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
 348 MODULE_LICENSE("GPL v2");