drivers/mfd/rohm-bd718x7.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 //
   3 // Copyright (C) 2018 ROHM Semiconductors
   4 //
   5 // ROHM BD71837MWV and BD71847MWV PMIC driver
   6 //
   7 // Datasheet for BD71837MWV available from
   8 // https://www.rohm.com/datasheet/BD71837MWV/bd71837mwv-e
   9
  10 #include <linux/gpio_keys.h>
  11 #include <linux/i2c.h>
  12 #include <linux/input.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/mfd/rohm-bd718x7.h>
  15 #include <linux/mfd/core.h>
  16 #include <linux/module.h>
  17 #include <linux/of_device.h>
  18 #include <linux/regmap.h>
  19 #include <linux/types.h>
  20
  21 static struct gpio_keys_button button = {
  22         .code = KEY_POWER,
  23         .gpio = -1,
  24         .type = EV_KEY,
  25 };
  26
  27 static struct gpio_keys_platform_data bd718xx_powerkey_data = {
  28         .buttons = &button,
  29         .nbuttons = 1,
  30         .name = "bd718xx-pwrkey",
  31 };
  32
  33 static struct mfd_cell bd718xx_mfd_cells[] = {
  34         {
  35                 .name = "gpio-keys",
  36                 .platform_data = &bd718xx_powerkey_data,
  37                 .pdata_size = sizeof(bd718xx_powerkey_data),
  38         },
  39         { .name = "bd718xx-clk", },
  40         { .name = "bd718xx-pmic", },
  41 };
  42
  43 static const struct regmap_irq bd718xx_irqs[] = {
  44         REGMAP_IRQ_REG(BD718XX_INT_SWRST, 0, BD718XX_INT_SWRST_MASK),
  45         REGMAP_IRQ_REG(BD718XX_INT_PWRBTN_S, 0, BD718XX_INT_PWRBTN_S_MASK),
  46         REGMAP_IRQ_REG(BD718XX_INT_PWRBTN_L, 0, BD718XX_INT_PWRBTN_L_MASK),
  47         REGMAP_IRQ_REG(BD718XX_INT_PWRBTN, 0, BD718XX_INT_PWRBTN_MASK),
  48         REGMAP_IRQ_REG(BD718XX_INT_WDOG, 0, BD718XX_INT_WDOG_MASK),
  49         REGMAP_IRQ_REG(BD718XX_INT_ON_REQ, 0, BD718XX_INT_ON_REQ_MASK),
  50         REGMAP_IRQ_REG(BD718XX_INT_STBY_REQ, 0, BD718XX_INT_STBY_REQ_MASK),
  51 };
  52
  53 static struct regmap_irq_chip bd718xx_irq_chip = {
  54         .name = "bd718xx-irq",
  55         .irqs = bd718xx_irqs,
  56         .num_irqs = ARRAY_SIZE(bd718xx_irqs),
  57         .num_regs = 1,
  58         .irq_reg_stride = 1,
  59         .status_base = BD718XX_REG_IRQ,
  60         .mask_base = BD718XX_REG_MIRQ,
  61         .ack_base = BD718XX_REG_IRQ,
  62         .init_ack_masked = true,
  63         .mask_invert = false,
  64 };
  65
  66 static const struct regmap_range pmic_status_range = {
  67         .range_min = BD718XX_REG_IRQ,
  68         .range_max = BD718XX_REG_POW_STATE,
  69 };
  70
  71 static const struct regmap_access_table volatile_regs = {
  72         .yes_ranges = &pmic_status_range,
  73         .n_yes_ranges = 1,
  74 };
  75
  76 static const struct regmap_config bd718xx_regmap_config = {
  77         .reg_bits = 8,
  78         .val_bits = 8,
  79         .volatile_table = &volatile_regs,
  80         .max_register = BD718XX_MAX_REGISTER - 1,
  81         .cache_type = REGCACHE_RBTREE,
  82 };
  83
  84 static int bd718xx_i2c_probe(struct i2c_client *i2c,
  85                             const struct i2c_device_id *id)
  86 {
  87         struct bd718xx *bd718xx;
  88         int ret;
  89
  90         if (!i2c->irq) {
  91                 dev_err(&i2c->dev, "No IRQ configured\n");
  92                 return -EINVAL;
  93         }
  94
  95         bd718xx = devm_kzalloc(&i2c->dev, sizeof(struct bd718xx), GFP_KERNEL);
  96
  97         if (!bd718xx)
  98                 return -ENOMEM;
  99
 100         bd718xx->chip_irq = i2c->irq;
 101         bd718xx->chip_type = (unsigned int)(uintptr_t)
 102                                 of_device_get_match_data(&i2c->dev);
 103         bd718xx->dev = &i2c->dev;
 104         dev_set_drvdata(&i2c->dev, bd718xx);
 105
 106         bd718xx->regmap = devm_regmap_init_i2c(i2c, &bd718xx_regmap_config);
 107         if (IS_ERR(bd718xx->regmap)) {
 108                 dev_err(&i2c->dev, "regmap initialization failed\n");
 109                 return PTR_ERR(bd718xx->regmap);
 110         }
 111
 112         ret = devm_regmap_add_irq_chip(&i2c->dev, bd718xx->regmap,
 113                                        bd718xx->chip_irq, IRQF_ONESHOT, 0,
 114                                        &bd718xx_irq_chip, &bd718xx->irq_data);
 115         if (ret) {
 116                 dev_err(&i2c->dev, "Failed to add irq_chip\n");
 117                 return ret;
 118         }
 119
 120         /* Configure short press to 10 milliseconds */
 121         ret = regmap_update_bits(bd718xx->regmap,
 122                                  BD718XX_REG_PWRONCONFIG0,
 123                                  BD718XX_PWRBTN_PRESS_DURATION_MASK,
 124                                  BD718XX_PWRBTN_SHORT_PRESS_10MS);
 125         if (ret) {
 126                 dev_err(&i2c->dev,
 127                         "Failed to configure button short press timeout\n");
 128                 return ret;
 129         }
 130
 131         /* Configure long press to 10 seconds */
 132         ret = regmap_update_bits(bd718xx->regmap,
 133                                  BD718XX_REG_PWRONCONFIG1,
 134                                  BD718XX_PWRBTN_PRESS_DURATION_MASK,
 135                                  BD718XX_PWRBTN_LONG_PRESS_10S);
 136
 137         if (ret) {
 138                 dev_err(&i2c->dev,
 139                         "Failed to configure button long press timeout\n");
 140                 return ret;
 141         }
 142
 143         ret = regmap_irq_get_virq(bd718xx->irq_data, BD718XX_INT_PWRBTN_S);
 144
 145         if (ret < 0) {
 146                 dev_err(&i2c->dev, "Failed to get the IRQ\n");
 147                 return ret;
 148         }
 149
 150         button.irq = ret;
 151
 152         ret = devm_mfd_add_devices(bd718xx->dev, PLATFORM_DEVID_AUTO,
 153                                    bd718xx_mfd_cells,
 154                                    ARRAY_SIZE(bd718xx_mfd_cells), NULL, 0,
 155                                    regmap_irq_get_domain(bd718xx->irq_data));
 156         if (ret)
 157                 dev_err(&i2c->dev, "Failed to create subdevices\n");
 158
 159         return ret;
 160 }
 161
 162 static const struct of_device_id bd718xx_of_match[] = {
 163         {
 164                 .compatible = "rohm,bd71837",
 165                 .data = (void *)BD718XX_TYPE_BD71837,
 166         },
 167         {
 168                 .compatible = "rohm,bd71847",
 169                 .data = (void *)BD718XX_TYPE_BD71847,
 170         },
 171         { }
 172 };
 173 MODULE_DEVICE_TABLE(of, bd718xx_of_match);
 174
 175 static struct i2c_driver bd718xx_i2c_driver = {
 176         .driver = {
 177                 .name = "rohm-bd718x7",
 178                 .of_match_table = bd718xx_of_match,
 179         },
 180         .probe = bd718xx_i2c_probe,
 181 };
 182
 183 static int __init bd718xx_i2c_init(void)
 184 {
 185         return i2c_add_driver(&bd718xx_i2c_driver);
 186 }
 187
 188 /* Initialise early so consumer devices can complete system boot */
 189 subsys_initcall(bd718xx_i2c_init);
 190
 191 static void __exit bd718xx_i2c_exit(void)
 192 {
 193         i2c_del_driver(&bd718xx_i2c_driver);
 194 }
 195 module_exit(bd718xx_i2c_exit);
 196
 197 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
 198 MODULE_DESCRIPTION("ROHM BD71837/BD71847 Power Management IC driver");
 199 MODULE_LICENSE("GPL");