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_init_press_duration(struct bd718xx *bd718xx)
  85 {
  86         struct device* dev = bd718xx->chip.dev;
  87         u32 short_press_ms, long_press_ms;
  88         u32 short_press_value, long_press_value;
  89         int ret;
  90
  91         ret = of_property_read_u32(dev->of_node, "rohm,short-press-ms",
  92                                    &short_press_ms);
  93         if (!ret) {
  94                 short_press_value = min(15u, (short_press_ms + 250) / 500);
  95                 ret = regmap_update_bits(bd718xx->chip.regmap,
  96                                          BD718XX_REG_PWRONCONFIG0,
  97                                          BD718XX_PWRBTN_PRESS_DURATION_MASK,
  98                                          short_press_value);
  99                 if (ret) {
 100                         dev_err(dev, "Failed to init pwron short press\n");
 101                         return ret;
 102                 }
 103         }
 104
 105         ret = of_property_read_u32(dev->of_node, "rohm,long-press-ms",
 106                                    &long_press_ms);
 107         if (!ret) {
 108                 long_press_value = min(15u, (long_press_ms + 500) / 1000);
 109                 ret = regmap_update_bits(bd718xx->chip.regmap,
 110                                          BD718XX_REG_PWRONCONFIG1,
 111                                          BD718XX_PWRBTN_PRESS_DURATION_MASK,
 112                                          long_press_value);
 113                 if (ret) {
 114                         dev_err(dev, "Failed to init pwron long press\n");
 115                         return ret;
 116                 }
 117         }
 118
 119         return 0;
 120 }
 121
 122 static int bd718xx_i2c_probe(struct i2c_client *i2c,
 123                             const struct i2c_device_id *id)
 124 {
 125         struct bd718xx *bd718xx;
 126         int ret;
 127
 128         if (!i2c->irq) {
 129                 dev_err(&i2c->dev, "No IRQ configured\n");
 130                 return -EINVAL;
 131         }
 132
 133         bd718xx = devm_kzalloc(&i2c->dev, sizeof(struct bd718xx), GFP_KERNEL);
 134
 135         if (!bd718xx)
 136                 return -ENOMEM;
 137
 138         bd718xx->chip_irq = i2c->irq;
 139         bd718xx->chip.chip_type = (unsigned int)(uintptr_t)
 140                                 of_device_get_match_data(&i2c->dev);
 141         bd718xx->chip.dev = &i2c->dev;
 142         dev_set_drvdata(&i2c->dev, bd718xx);
 143
 144         bd718xx->chip.regmap = devm_regmap_init_i2c(i2c,
 145                                                     &bd718xx_regmap_config);
 146         if (IS_ERR(bd718xx->chip.regmap)) {
 147                 dev_err(&i2c->dev, "regmap initialization failed\n");
 148                 return PTR_ERR(bd718xx->chip.regmap);
 149         }
 150
 151         ret = devm_regmap_add_irq_chip(&i2c->dev, bd718xx->chip.regmap,
 152                                        bd718xx->chip_irq, IRQF_ONESHOT, 0,
 153                                        &bd718xx_irq_chip, &bd718xx->irq_data);
 154         if (ret) {
 155                 dev_err(&i2c->dev, "Failed to add irq_chip\n");
 156                 return ret;
 157         }
 158
 159         ret = bd718xx_init_press_duration(bd718xx);
 160         if (ret)
 161                 return ret;
 162
 163         ret = regmap_irq_get_virq(bd718xx->irq_data, BD718XX_INT_PWRBTN_S);
 164
 165         if (ret < 0) {
 166                 dev_err(&i2c->dev, "Failed to get the IRQ\n");
 167                 return ret;
 168         }
 169
 170         button.irq = ret;
 171
 172         ret = devm_mfd_add_devices(bd718xx->chip.dev, PLATFORM_DEVID_AUTO,
 173                                    bd718xx_mfd_cells,
 174                                    ARRAY_SIZE(bd718xx_mfd_cells), NULL, 0,
 175                                    regmap_irq_get_domain(bd718xx->irq_data));
 176         if (ret)
 177                 dev_err(&i2c->dev, "Failed to create subdevices\n");
 178
 179         return ret;
 180 }
 181
 182 static const struct of_device_id bd718xx_of_match[] = {
 183         {
 184                 .compatible = "rohm,bd71837",
 185                 .data = (void *)ROHM_CHIP_TYPE_BD71837,
 186         },
 187         {
 188                 .compatible = "rohm,bd71847",
 189                 .data = (void *)ROHM_CHIP_TYPE_BD71847,
 190         },
 191         { }
 192 };
 193 MODULE_DEVICE_TABLE(of, bd718xx_of_match);
 194
 195 static struct i2c_driver bd718xx_i2c_driver = {
 196         .driver = {
 197                 .name = "rohm-bd718x7",
 198                 .of_match_table = bd718xx_of_match,
 199         },
 200         .probe = bd718xx_i2c_probe,
 201 };
 202
 203 static int __init bd718xx_i2c_init(void)
 204 {
 205         return i2c_add_driver(&bd718xx_i2c_driver);
 206 }
 207
 208 /* Initialise early so consumer devices can complete system boot */
 209 subsys_initcall(bd718xx_i2c_init);
 210
 211 static void __exit bd718xx_i2c_exit(void)
 212 {
 213         i2c_del_driver(&bd718xx_i2c_driver);
 214 }
 215 module_exit(bd718xx_i2c_exit);
 216
 217 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
 218 MODULE_DESCRIPTION("ROHM BD71837/BD71847 Power Management IC driver");
 219 MODULE_LICENSE("GPL");