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 regmap *regmap,
  95                                        struct device *dev)
  96 {
  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(regmap, BD718XX_REG_PWRONCONFIG0,
 106                                          BD718XX_PWRBTN_PRESS_DURATION_MASK,
 107                                          short_press_value);
 108                 if (ret) {
 109                         dev_err(dev, "Failed to init pwron short press\n");
 110                         return ret;
 111                 }
 112         }
 113
 114         ret = of_property_read_u32(dev->of_node, "rohm,long-press-ms",
 115                                    &long_press_ms);
 116         if (!ret) {
 117                 long_press_value = min(15u, (long_press_ms + 500) / 1000);
 118                 ret = regmap_update_bits(regmap, BD718XX_REG_PWRONCONFIG1,
 119                                          BD718XX_PWRBTN_PRESS_DURATION_MASK,
 120                                          long_press_value);
 121                 if (ret) {
 122                         dev_err(dev, "Failed to init pwron long press\n");
 123                         return ret;
 124                 }
 125         }
 126
 127         return 0;
 128 }
 129
 130 static int bd718xx_i2c_probe(struct i2c_client *i2c,
 131                             const struct i2c_device_id *id)
 132 {
 133         struct regmap *regmap;
 134         struct regmap_irq_chip_data *irq_data;
 135         int ret;
 136         unsigned int chip_type;
 137         struct mfd_cell *mfd;
 138         int cells;
 139
 140         if (!i2c->irq) {
 141                 dev_err(&i2c->dev, "No IRQ configured\n");
 142                 return -EINVAL;
 143         }
 144         chip_type = (unsigned int)(uintptr_t)
 145                     of_device_get_match_data(&i2c->dev);
 146         switch (chip_type) {
 147         case ROHM_CHIP_TYPE_BD71837:
 148                 mfd = bd71837_mfd_cells;
 149                 cells = ARRAY_SIZE(bd71837_mfd_cells);
 150                 break;
 151         case ROHM_CHIP_TYPE_BD71847:
 152                 mfd = bd71847_mfd_cells;
 153                 cells = ARRAY_SIZE(bd71847_mfd_cells);
 154                 break;
 155         default:
 156                 dev_err(&i2c->dev, "Unknown device type");
 157                 return -EINVAL;
 158         }
 159
 160         regmap = devm_regmap_init_i2c(i2c, &bd718xx_regmap_config);
 161         if (IS_ERR(regmap)) {
 162                 dev_err(&i2c->dev, "regmap initialization failed\n");
 163                 return PTR_ERR(regmap);
 164         }
 165
 166         ret = devm_regmap_add_irq_chip(&i2c->dev, regmap, i2c->irq,
 167                                        IRQF_ONESHOT, 0, &bd718xx_irq_chip,
 168                                        &irq_data);
 169         if (ret) {
 170                 dev_err(&i2c->dev, "Failed to add irq_chip\n");
 171                 return ret;
 172         }
 173
 174         ret = bd718xx_init_press_duration(regmap, &i2c->dev);
 175         if (ret)
 176                 return ret;
 177
 178         ret = regmap_irq_get_virq(irq_data, BD718XX_INT_PWRBTN_S);
 179
 180         if (ret < 0) {
 181                 dev_err(&i2c->dev, "Failed to get the IRQ\n");
 182                 return ret;
 183         }
 184
 185         button.irq = ret;
 186
 187         ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
 188                                    mfd, cells, NULL, 0,
 189                                    regmap_irq_get_domain(irq_data));
 190         if (ret)
 191                 dev_err(&i2c->dev, "Failed to create subdevices\n");
 192
 193         return ret;
 194 }
 195
 196 static const struct of_device_id bd718xx_of_match[] = {
 197         {
 198                 .compatible = "rohm,bd71837",
 199                 .data = (void *)ROHM_CHIP_TYPE_BD71837,
 200         },
 201         {
 202                 .compatible = "rohm,bd71847",
 203                 .data = (void *)ROHM_CHIP_TYPE_BD71847,
 204         },
 205         {
 206                 .compatible = "rohm,bd71850",
 207                 .data = (void *)ROHM_CHIP_TYPE_BD71847,
 208         },
 209         { }
 210 };
 211 MODULE_DEVICE_TABLE(of, bd718xx_of_match);
 212
 213 static struct i2c_driver bd718xx_i2c_driver = {
 214         .driver = {
 215                 .name = "rohm-bd718x7",
 216                 .of_match_table = bd718xx_of_match,
 217         },
 218         .probe = bd718xx_i2c_probe,
 219 };
 220
 221 static int __init bd718xx_i2c_init(void)
 222 {
 223         return i2c_add_driver(&bd718xx_i2c_driver);
 224 }
 225
 226 /* Initialise early so consumer devices can complete system boot */
 227 subsys_initcall(bd718xx_i2c_init);
 228
 229 static void __exit bd718xx_i2c_exit(void)
 230 {
 231         i2c_del_driver(&bd718xx_i2c_driver);
 232 }
 233 module_exit(bd718xx_i2c_exit);
 234
 235 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
 236 MODULE_DESCRIPTION("ROHM BD71837/BD71847 Power Management IC driver");
 237 MODULE_LICENSE("GPL");