231 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2//3// Copyright (C) 2018 ROHM Semiconductors4//5// ROHM BD71837MWV and BD71847MWV PMIC driver6//7// Datasheet for BD71837MWV available from8// https://www.rohm.com/datasheet/BD71837MWV/bd71837mwv-e9 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 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 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 75static const struct regmap_range pmic_status_range = {76 .range_min = BD718XX_REG_IRQ,77 .range_max = BD718XX_REG_POW_STATE,78};79 80static const struct regmap_access_table volatile_regs = {81 .yes_ranges = &pmic_status_range,82 .n_yes_ranges = 1,83};84 85static 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 93static 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 129static 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 189static 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};204MODULE_DEVICE_TABLE(of, bd718xx_of_match);205 206static 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 214static 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 */220subsys_initcall(bd718xx_i2c_init);221 222static void __exit bd718xx_i2c_exit(void)223{224 i2c_del_driver(&bd718xx_i2c_driver);225}226module_exit(bd718xx_i2c_exit);227 228MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");229MODULE_DESCRIPTION("ROHM BD71837/BD71847 Power Management IC driver");230MODULE_LICENSE("GPL");231