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 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 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         .mask_invert = false,
  74 };
  75
  76 static const struct regmap_range pmic_status_range = {
  77         .range_min = BD718XX_REG_IRQ,
  78         .range_max = BD718XX_REG_POW_STATE,
  79 };
  80
  81 static const struct regmap_access_table volatile_regs = {
  82         .yes_ranges = &pmic_status_range,
  83         .n_yes_ranges = 1,
  84 };
  85
  86 static const struct regmap_config bd718xx_regmap_config = {
  87         .reg_bits = 8,
  88         .val_bits = 8,
  89         .volatile_table = &volatile_regs,
  90         .max_register = BD718XX_MAX_REGISTER - 1,
  91         .cache_type = REGCACHE_RBTREE,
  92 };
  93
  94 static int bd718xx_init_press_duration(struct bd718xx *bd718xx)
  95 {
  96         struct device* dev = bd718xx->chip.dev;
  97         u32 short_press_ms, long_press_ms;
  98         u32 short_press_value, long_press_value;
  99         int ret;
 100
 101         ret = of_property_read_u32(dev->of_node, "rohm,short-press-ms",
 102                                    &short_press_ms);
 103         if (!ret) {
 104                 short_press_value = min(15u, (short_press_ms + 250) / 500);
 105                 ret = regmap_update_bits(bd718xx->chip.regmap,
 106                                          BD718XX_REG_PWRONCONFIG0,
 107                                          BD718XX_PWRBTN_PRESS_DURATION_MASK,
 108                                          short_press_value);
 109                 if (ret) {
 110                         dev_err(dev, "Failed to init pwron short press\n");
 111                         return ret;
 112                 }
 113         }
 114
 115         ret = of_property_read_u32(dev->of_node, "rohm,long-press-ms",
 116                                    &long_press_ms);
 117         if (!ret) {
 118                 long_press_value = min(15u, (long_press_ms + 500) / 1000);
 119                 ret = regmap_update_bits(bd718xx->chip.regmap,
 120                                          BD718XX_REG_PWRONCONFIG1,
 121                                          BD718XX_PWRBTN_PRESS_DURATION_MASK,
 122                                          long_press_value);
 123                 if (ret) {
 124                         dev_err(dev, "Failed to init pwron long press\n");
 125                         return ret;
 126                 }
 127         }
 128
 129         return 0;
 130 }
 131
 132 static int bd718xx_i2c_probe(struct i2c_client *i2c,
 133                             const struct i2c_device_id *id)
 134 {
 135         struct bd718xx *bd718xx;
 136         int ret;
 137         unsigned int chip_type;
 138         struct mfd_cell *mfd;
 139         int cells;
 140
 141         if (!i2c->irq) {
 142                 dev_err(&i2c->dev, "No IRQ configured\n");
 143                 return -EINVAL;
 144         }
 145
 146         bd718xx = devm_kzalloc(&i2c->dev, sizeof(struct bd718xx), GFP_KERNEL);
 147
 148         if (!bd718xx)
 149                 return -ENOMEM;
 150
 151         bd718xx->chip_irq = i2c->irq;
 152         chip_type = (unsigned int)(uintptr_t)
 153                     of_device_get_match_data(&i2c->dev);
 154         switch (chip_type) {
 155         case ROHM_CHIP_TYPE_BD71837:
 156                 mfd = bd71837_mfd_cells;
 157                 cells = ARRAY_SIZE(bd71837_mfd_cells);
 158                 break;
 159         case ROHM_CHIP_TYPE_BD71847:
 160                 mfd = bd71847_mfd_cells;
 161                 cells = ARRAY_SIZE(bd71847_mfd_cells);
 162                 break;
 163         default:
 164                 dev_err(&i2c->dev, "Unknown device type");
 165                 return -EINVAL;
 166         }
 167         bd718xx->chip.dev = &i2c->dev;
 168         dev_set_drvdata(&i2c->dev, bd718xx);
 169
 170         bd718xx->chip.regmap = devm_regmap_init_i2c(i2c,
 171                                                     &bd718xx_regmap_config);
 172         if (IS_ERR(bd718xx->chip.regmap)) {
 173                 dev_err(&i2c->dev, "regmap initialization failed\n");
 174                 return PTR_ERR(bd718xx->chip.regmap);
 175         }
 176
 177         ret = devm_regmap_add_irq_chip(&i2c->dev, bd718xx->chip.regmap,
 178                                        bd718xx->chip_irq, IRQF_ONESHOT, 0,
 179                                        &bd718xx_irq_chip, &bd718xx->irq_data);
 180         if (ret) {
 181                 dev_err(&i2c->dev, "Failed to add irq_chip\n");
 182                 return ret;
 183         }
 184
 185         ret = bd718xx_init_press_duration(bd718xx);
 186         if (ret)
 187                 return ret;
 188
 189         ret = regmap_irq_get_virq(bd718xx->irq_data, BD718XX_INT_PWRBTN_S);
 190
 191         if (ret < 0) {
 192                 dev_err(&i2c->dev, "Failed to get the IRQ\n");
 193                 return ret;
 194         }
 195
 196         button.irq = ret;
 197
 198         ret = devm_mfd_add_devices(bd718xx->chip.dev, PLATFORM_DEVID_AUTO,
 199                                    mfd, cells, NULL, 0,
 200                                    regmap_irq_get_domain(bd718xx->irq_data));
 201         if (ret)
 202                 dev_err(&i2c->dev, "Failed to create subdevices\n");
 203
 204         return ret;
 205 }
 206
 207 static const struct of_device_id bd718xx_of_match[] = {
 208         {
 209                 .compatible = "rohm,bd71837",
 210                 .data = (void *)ROHM_CHIP_TYPE_BD71837,
 211         },
 212         {
 213                 .compatible = "rohm,bd71847",
 214                 .data = (void *)ROHM_CHIP_TYPE_BD71847,
 215         },
 216         {
 217                 .compatible = "rohm,bd71850",
 218                 .data = (void *)ROHM_CHIP_TYPE_BD71847,
 219         },
 220         { }
 221 };
 222 MODULE_DEVICE_TABLE(of, bd718xx_of_match);
 223
 224 static struct i2c_driver bd718xx_i2c_driver = {
 225         .driver = {
 226                 .name = "rohm-bd718x7",
 227                 .of_match_table = bd718xx_of_match,
 228         },
 229         .probe = bd718xx_i2c_probe,
 230 };
 231
 232 static int __init bd718xx_i2c_init(void)
 233 {
 234         return i2c_add_driver(&bd718xx_i2c_driver);
 235 }
 236
 237 /* Initialise early so consumer devices can complete system boot */
 238 subsys_initcall(bd718xx_i2c_init);
 239
 240 static void __exit bd718xx_i2c_exit(void)
 241 {
 242         i2c_del_driver(&bd718xx_i2c_driver);
 243 }
 244 module_exit(bd718xx_i2c_exit);
 245
 246 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
 247 MODULE_DESCRIPTION("ROHM BD71837/BD71847 Power Management IC driver");
 248 MODULE_LICENSE("GPL");