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 PMIC driver
   6 //
   7 // Datasheet available from
   8 // https://www.rohm.com/datasheet/BD71837MWV/bd71837mwv-e
   9
  10 #include <linux/i2c.h>
  11 #include <linux/input.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/mfd/rohm-bd718x7.h>
  14 #include <linux/mfd/core.h>
  15 #include <linux/module.h>
  16 #include <linux/regmap.h>
  17
  18 /*
  19  * gpio_keys.h requires definiton of bool. It is brought in
  20  * by above includes. Keep this as last until gpio_keys.h gets fixed.
  21  */
  22 #include <linux/gpio_keys.h>
  23
  24 static const u8 supported_revisions[] = { 0xA2 /* BD71837 */ };
  25
  26 static struct gpio_keys_button button = {
  27         .code = KEY_POWER,
  28         .gpio = -1,
  29         .type = EV_KEY,
  30 };
  31
  32 static struct gpio_keys_platform_data bd718xx_powerkey_data = {
  33         .buttons = &button,
  34         .nbuttons = 1,
  35         .name = "bd718xx-pwrkey",
  36 };
  37
  38 static struct mfd_cell bd71837_mfd_cells[] = {
  39         {
  40                 .name = "gpio-keys",
  41                 .platform_data = &bd718xx_powerkey_data,
  42                 .pdata_size = sizeof(bd718xx_powerkey_data),
  43         },
  44         { .name = "bd71837-clk", },
  45         { .name = "bd71837-pmic", },
  46 };
  47
  48 static const struct regmap_irq bd71837_irqs[] = {
  49         REGMAP_IRQ_REG(BD71837_INT_SWRST, 0, BD71837_INT_SWRST_MASK),
  50         REGMAP_IRQ_REG(BD71837_INT_PWRBTN_S, 0, BD71837_INT_PWRBTN_S_MASK),
  51         REGMAP_IRQ_REG(BD71837_INT_PWRBTN_L, 0, BD71837_INT_PWRBTN_L_MASK),
  52         REGMAP_IRQ_REG(BD71837_INT_PWRBTN, 0, BD71837_INT_PWRBTN_MASK),
  53         REGMAP_IRQ_REG(BD71837_INT_WDOG, 0, BD71837_INT_WDOG_MASK),
  54         REGMAP_IRQ_REG(BD71837_INT_ON_REQ, 0, BD71837_INT_ON_REQ_MASK),
  55         REGMAP_IRQ_REG(BD71837_INT_STBY_REQ, 0, BD71837_INT_STBY_REQ_MASK),
  56 };
  57
  58 static struct regmap_irq_chip bd71837_irq_chip = {
  59         .name = "bd71837-irq",
  60         .irqs = bd71837_irqs,
  61         .num_irqs = ARRAY_SIZE(bd71837_irqs),
  62         .num_regs = 1,
  63         .irq_reg_stride = 1,
  64         .status_base = BD71837_REG_IRQ,
  65         .mask_base = BD71837_REG_MIRQ,
  66         .ack_base = BD71837_REG_IRQ,
  67         .init_ack_masked = true,
  68         .mask_invert = false,
  69 };
  70
  71 static const struct regmap_range pmic_status_range = {
  72         .range_min = BD71837_REG_IRQ,
  73         .range_max = BD71837_REG_POW_STATE,
  74 };
  75
  76 static const struct regmap_access_table volatile_regs = {
  77         .yes_ranges = &pmic_status_range,
  78         .n_yes_ranges = 1,
  79 };
  80
  81 static const struct regmap_config bd71837_regmap_config = {
  82         .reg_bits = 8,
  83         .val_bits = 8,
  84         .volatile_table = &volatile_regs,
  85         .max_register = BD71837_MAX_REGISTER - 1,
  86         .cache_type = REGCACHE_RBTREE,
  87 };
  88
  89 static int bd71837_i2c_probe(struct i2c_client *i2c,
  90                             const struct i2c_device_id *id)
  91 {
  92         struct bd71837 *bd71837;
  93         int ret, i;
  94         unsigned int val;
  95
  96         bd71837 = devm_kzalloc(&i2c->dev, sizeof(struct bd71837), GFP_KERNEL);
  97
  98         if (!bd71837)
  99                 return -ENOMEM;
 100
 101         bd71837->chip_irq = i2c->irq;
 102
 103         if (!bd71837->chip_irq) {
 104                 dev_err(&i2c->dev, "No IRQ configured\n");
 105                 return -EINVAL;
 106         }
 107
 108         bd71837->dev = &i2c->dev;
 109         dev_set_drvdata(&i2c->dev, bd71837);
 110
 111         bd71837->regmap = devm_regmap_init_i2c(i2c, &bd71837_regmap_config);
 112         if (IS_ERR(bd71837->regmap)) {
 113                 dev_err(&i2c->dev, "regmap initialization failed\n");
 114                 return PTR_ERR(bd71837->regmap);
 115         }
 116
 117         ret = regmap_read(bd71837->regmap, BD71837_REG_REV, &val);
 118         if (ret) {
 119                 dev_err(&i2c->dev, "Read BD71837_REG_DEVICE failed\n");
 120                 return ret;
 121         }
 122         for (i = 0; i < ARRAY_SIZE(supported_revisions); i++)
 123                 if (supported_revisions[i] == val)
 124                         break;
 125
 126         if (i == ARRAY_SIZE(supported_revisions)) {
 127                 dev_err(&i2c->dev, "Unsupported chip revision\n");
 128                 return -ENODEV;
 129         }
 130
 131         ret = devm_regmap_add_irq_chip(&i2c->dev, bd71837->regmap,
 132                                        bd71837->chip_irq, IRQF_ONESHOT, 0,
 133                                        &bd71837_irq_chip, &bd71837->irq_data);
 134         if (ret) {
 135                 dev_err(&i2c->dev, "Failed to add irq_chip\n");
 136                 return ret;
 137         }
 138
 139         /* Configure short press to 10 milliseconds */
 140         ret = regmap_update_bits(bd71837->regmap,
 141                                  BD71837_REG_PWRONCONFIG0,
 142                                  BD718XX_PWRBTN_PRESS_DURATION_MASK,
 143                                  BD718XX_PWRBTN_SHORT_PRESS_10MS);
 144         if (ret) {
 145                 dev_err(&i2c->dev,
 146                         "Failed to configure button short press timeout\n");
 147                 return ret;
 148         }
 149
 150         /* Configure long press to 10 seconds */
 151         ret = regmap_update_bits(bd71837->regmap,
 152                                  BD71837_REG_PWRONCONFIG1,
 153                                  BD718XX_PWRBTN_PRESS_DURATION_MASK,
 154                                  BD718XX_PWRBTN_LONG_PRESS_10S);
 155
 156         if (ret) {
 157                 dev_err(&i2c->dev,
 158                         "Failed to configure button long press timeout\n");
 159                 return ret;
 160         }
 161
 162         ret = regmap_irq_get_virq(bd71837->irq_data, BD71837_INT_PWRBTN_S);
 163
 164         if (ret < 0) {
 165                 dev_err(&i2c->dev, "Failed to get the IRQ\n");
 166                 return ret;
 167         }
 168
 169         button.irq = ret;
 170
 171         ret = devm_mfd_add_devices(bd71837->dev, PLATFORM_DEVID_AUTO,
 172                                    bd71837_mfd_cells,
 173                                    ARRAY_SIZE(bd71837_mfd_cells), NULL, 0,
 174                                    regmap_irq_get_domain(bd71837->irq_data));
 175         if (ret)
 176                 dev_err(&i2c->dev, "Failed to create subdevices\n");
 177
 178         return ret;
 179 }
 180
 181 static const struct of_device_id bd71837_of_match[] = {
 182         { .compatible = "rohm,bd71837", },
 183         { }
 184 };
 185 MODULE_DEVICE_TABLE(of, bd71837_of_match);
 186
 187 static struct i2c_driver bd71837_i2c_driver = {
 188         .driver = {
 189                 .name = "rohm-bd718x7",
 190                 .of_match_table = bd71837_of_match,
 191         },
 192         .probe = bd71837_i2c_probe,
 193 };
 194
 195 static int __init bd71837_i2c_init(void)
 196 {
 197         return i2c_add_driver(&bd71837_i2c_driver);
 198 }
 199
 200 /* Initialise early so consumer devices can complete system boot */
 201 subsys_initcall(bd71837_i2c_init);
 202
 203 static void __exit bd71837_i2c_exit(void)
 204 {
 205         i2c_del_driver(&bd71837_i2c_driver);
 206 }
 207 module_exit(bd71837_i2c_exit);
 208
 209 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
 210 MODULE_DESCRIPTION("ROHM BD71837 Power Management IC driver");
 211 MODULE_LICENSE("GPL");