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.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 bd71837_mfd_cells[] = {
  34         {
  35                 .name = "gpio-keys",
  36                 .platform_data = &bd718xx_powerkey_data,
  37                 .pdata_size = sizeof(bd718xx_powerkey_data),
  38         },
  39         { .name = "bd71837-clk", },
  40         { .name = "bd71837-pmic", },
  41 };
  42
  43 static struct mfd_cell bd71847_mfd_cells[] = {
  44         {
  45                 .name = "gpio-keys",
  46                 .platform_data = &bd718xx_powerkey_data,
  47                 .pdata_size = sizeof(bd718xx_powerkey_data),
  48         },
  49         { .name = "bd71847-clk", },
  50         { .name = "bd71847-pmic", },
  51 };
  52
  53 static const struct regmap_irq bd718xx_irqs[] = {
  54         REGMAP_IRQ_REG(BD718XX_INT_SWRST, 0, BD718XX_INT_SWRST_MASK),
  55         REGMAP_IRQ_REG(BD718XX_INT_PWRBTN_S, 0, BD718XX_INT_PWRBTN_S_MASK),
  56         REGMAP_IRQ_REG(BD718XX_INT_PWRBTN_L, 0, BD718XX_INT_PWRBTN_L_MASK),
  57         REGMAP_IRQ_REG(BD718XX_INT_PWRBTN, 0, BD718XX_INT_PWRBTN_MASK),
  58         REGMAP_IRQ_REG(BD718XX_INT_WDOG, 0, BD718XX_INT_WDOG_MASK),
  59         REGMAP_IRQ_REG(BD718XX_INT_ON_REQ, 0, BD718XX_INT_ON_REQ_MASK),
  60         REGMAP_IRQ_REG(BD718XX_INT_STBY_REQ, 0, BD718XX_INT_STBY_REQ_MASK),
  61 };
  62
  63 static const struct regmap_irq_chip bd718xx_irq_chip = {
  64         .name = "bd718xx-irq",
  65         .irqs = bd718xx_irqs,
  66         .num_irqs = ARRAY_SIZE(bd718xx_irqs),
  67         .num_regs = 1,
  68         .irq_reg_stride = 1,
  69         .status_base = BD718XX_REG_IRQ,
  70         .mask_base = BD718XX_REG_MIRQ,
  71         .ack_base = BD718XX_REG_IRQ,
  72         .init_ack_masked = true,
  73 };
  74
  75 static const struct regmap_range pmic_status_range = {
  76         .range_min = BD718XX_REG_IRQ,
  77         .range_max = BD718XX_REG_POW_STATE,
  78 };
  79
  80 static const struct regmap_access_table volatile_regs = {
  81         .yes_ranges = &pmic_status_range,
  82         .n_yes_ranges = 1,
  83 };
  84
  85 static const struct regmap_config bd718xx_regmap_config = {
  86         .reg_bits = 8,
  87         .val_bits = 8,
  88         .volatile_table = &volatile_regs,
  89         .max_register = BD718XX_MAX_REGISTER - 1,
  90         .cache_type = REGCACHE_MAPLE,
  91 };
  92
  93 static int bd718xx_init_press_duration(struct regmap *regmap,
  94                                        struct device *dev)
  95 {
  96         u32 short_press_ms, long_press_ms;
  97         u32 short_press_value, long_press_value;
  98         int ret;
  99
 100         ret = of_property_read_u32(dev->of_node, "rohm,short-press-ms",
 101                                    &short_press_ms);
 102         if (!ret) {
 103                 short_press_value = min(15u, (short_press_ms + 250) / 500);
 104                 ret = regmap_update_bits(regmap, BD718XX_REG_PWRONCONFIG0,
 105                                          BD718XX_PWRBTN_PRESS_DURATION_MASK,
 106                                          short_press_value);
 107                 if (ret) {
 108                         dev_err(dev, "Failed to init pwron short press\n");
 109                         return ret;
 110                 }
 111         }
 112
 113         ret = of_property_read_u32(dev->of_node, "rohm,long-press-ms",
 114                                    &long_press_ms);
 115         if (!ret) {
 116                 long_press_value = min(15u, (long_press_ms + 500) / 1000);
 117                 ret = regmap_update_bits(regmap, BD718XX_REG_PWRONCONFIG1,
 118                                          BD718XX_PWRBTN_PRESS_DURATION_MASK,
 119                                          long_press_value);
 120                 if (ret) {
 121                         dev_err(dev, "Failed to init pwron long press\n");
 122                         return ret;
 123                 }
 124         }
 125
 126         return 0;
 127 }
 128
 129 static int bd718xx_i2c_probe(struct i2c_client *i2c)
 130 {
 131         struct regmap *regmap;
 132         struct regmap_irq_chip_data *irq_data;
 133         int ret;
 134         unsigned int chip_type;
 135         struct mfd_cell *mfd;
 136         int cells;
 137
 138         if (!i2c->irq) {
 139                 dev_err(&i2c->dev, "No IRQ configured\n");
 140                 return -EINVAL;
 141         }
 142         chip_type = (unsigned int)(uintptr_t)
 143                     of_device_get_match_data(&i2c->dev);
 144         switch (chip_type) {
 145         case ROHM_CHIP_TYPE_BD71837:
 146                 mfd = bd71837_mfd_cells;
 147                 cells = ARRAY_SIZE(bd71837_mfd_cells);
 148                 break;
 149         case ROHM_CHIP_TYPE_BD71847:
 150                 mfd = bd71847_mfd_cells;
 151                 cells = ARRAY_SIZE(bd71847_mfd_cells);
 152                 break;
 153         default:
 154                 dev_err(&i2c->dev, "Unknown device type");
 155                 return -EINVAL;
 156         }
 157
 158         regmap = devm_regmap_init_i2c(i2c, &bd718xx_regmap_config);
 159         if (IS_ERR(regmap))
 160                 return dev_err_probe(&i2c->dev, PTR_ERR(regmap),
 161                                      "regmap initialization failed\n");
 162
 163         ret = devm_regmap_add_irq_chip(&i2c->dev, regmap, i2c->irq,
 164                                        IRQF_ONESHOT, 0, &bd718xx_irq_chip,
 165                                        &irq_data);
 166         if (ret)
 167                 return dev_err_probe(&i2c->dev, ret, "Failed to add irq_chip\n");
 168
 169         ret = bd718xx_init_press_duration(regmap, &i2c->dev);
 170         if (ret)
 171                 return ret;
 172
 173         ret = regmap_irq_get_virq(irq_data, BD718XX_INT_PWRBTN_S);
 174
 175         if (ret < 0)
 176                 return dev_err_probe(&i2c->dev, ret, "Failed to get the IRQ\n");
 177
 178         button.irq = ret;
 179
 180         ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
 181                                    mfd, cells, NULL, 0,
 182                                    regmap_irq_get_domain(irq_data));
 183         if (ret)
 184                 dev_err_probe(&i2c->dev, ret, "Failed to create subdevices\n");
 185
 186         return ret;
 187 }
 188
 189 static const struct of_device_id bd718xx_of_match[] = {
 190         {
 191                 .compatible = "rohm,bd71837",
 192                 .data = (void *)ROHM_CHIP_TYPE_BD71837,
 193         },
 194         {
 195                 .compatible = "rohm,bd71847",
 196                 .data = (void *)ROHM_CHIP_TYPE_BD71847,
 197         },
 198         {
 199                 .compatible = "rohm,bd71850",
 200                 .data = (void *)ROHM_CHIP_TYPE_BD71847,
 201         },
 202         { }
 203 };
 204 MODULE_DEVICE_TABLE(of, bd718xx_of_match);
 205
 206 static struct i2c_driver bd718xx_i2c_driver = {
 207         .driver = {
 208                 .name = "rohm-bd718x7",
 209                 .of_match_table = bd718xx_of_match,
 210         },
 211         .probe = bd718xx_i2c_probe,
 212 };
 213
 214 static int __init bd718xx_i2c_init(void)
 215 {
 216         return i2c_add_driver(&bd718xx_i2c_driver);
 217 }
 218
 219 /* Initialise early so consumer devices can complete system boot */
 220 subsys_initcall(bd718xx_i2c_init);
 221
 222 static void __exit bd718xx_i2c_exit(void)
 223 {
 224         i2c_del_driver(&bd718xx_i2c_driver);
 225 }
 226 module_exit(bd718xx_i2c_exit);
 227
 228 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
 229 MODULE_DESCRIPTION("ROHM BD71837/BD71847 Power Management IC driver");
 230 MODULE_LICENSE("GPL");