linux/drivers/mfd/rohm-bd718x7.c
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   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
  21static struct gpio_keys_button button = {
  22        .code = KEY_POWER,
  23        .gpio = -1,
  24        .type = EV_KEY,
  25};
  26
  27static struct gpio_keys_platform_data bd718xx_powerkey_data = {
  28        .buttons = &button,
  29        .nbuttons = 1,
  30        .name = "bd718xx-pwrkey",
  31};
  32
  33static 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
  43static 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
  53static 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
  63static 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
  76static const struct regmap_range pmic_status_range = {
  77        .range_min = BD718XX_REG_IRQ,
  78        .range_max = BD718XX_REG_POW_STATE,
  79};
  80
  81static const struct regmap_access_table volatile_regs = {
  82        .yes_ranges = &pmic_status_range,
  83        .n_yes_ranges = 1,
  84};
  85
  86static 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
  94static 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
 132static 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
 207static 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};
 222MODULE_DEVICE_TABLE(of, bd718xx_of_match);
 223
 224static 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
 232static 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 */
 238subsys_initcall(bd718xx_i2c_init);
 239
 240static void __exit bd718xx_i2c_exit(void)
 241{
 242        i2c_del_driver(&bd718xx_i2c_driver);
 243}
 244module_exit(bd718xx_i2c_exit);
 245
 246MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
 247MODULE_DESCRIPTION("ROHM BD71837/BD71847 Power Management IC driver");
 248MODULE_LICENSE("GPL");
 249