diff options
Diffstat (limited to 'drivers/mfd/rohm-bd718x7.c')
| -rw-r--r-- | drivers/mfd/rohm-bd718x7.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/drivers/mfd/rohm-bd718x7.c b/drivers/mfd/rohm-bd718x7.c new file mode 100644 index 000000000..75c8ec659 --- /dev/null +++ b/drivers/mfd/rohm-bd718x7.c @@ -0,0 +1,211 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +// +// Copyright (C) 2018 ROHM Semiconductors +// +// ROHM BD71837MWV PMIC driver +// +// Datasheet available from +// https://www.rohm.com/datasheet/BD71837MWV/bd71837mwv-e + +#include <linux/i2c.h> +#include <linux/input.h> +#include <linux/interrupt.h> +#include <linux/mfd/rohm-bd718x7.h> +#include <linux/mfd/core.h> +#include <linux/module.h> +#include <linux/regmap.h> + +/* + * gpio_keys.h requires definiton of bool. It is brought in + * by above includes. Keep this as last until gpio_keys.h gets fixed. + */ +#include <linux/gpio_keys.h> + +static const u8 supported_revisions[] = { 0xA2 /* BD71837 */ }; + +static struct gpio_keys_button button = { + .code = KEY_POWER, + .gpio = -1, + .type = EV_KEY, +}; + +static struct gpio_keys_platform_data bd718xx_powerkey_data = { + .buttons = &button, + .nbuttons = 1, + .name = "bd718xx-pwrkey", +}; + +static struct mfd_cell bd71837_mfd_cells[] = { + { + .name = "gpio-keys", + .platform_data = &bd718xx_powerkey_data, + .pdata_size = sizeof(bd718xx_powerkey_data), + }, + { .name = "bd71837-clk", }, + { .name = "bd71837-pmic", }, +}; + +static const struct regmap_irq bd71837_irqs[] = { + REGMAP_IRQ_REG(BD71837_INT_SWRST, 0, BD71837_INT_SWRST_MASK), + REGMAP_IRQ_REG(BD71837_INT_PWRBTN_S, 0, BD71837_INT_PWRBTN_S_MASK), + REGMAP_IRQ_REG(BD71837_INT_PWRBTN_L, 0, BD71837_INT_PWRBTN_L_MASK), + REGMAP_IRQ_REG(BD71837_INT_PWRBTN, 0, BD71837_INT_PWRBTN_MASK), + REGMAP_IRQ_REG(BD71837_INT_WDOG, 0, BD71837_INT_WDOG_MASK), + REGMAP_IRQ_REG(BD71837_INT_ON_REQ, 0, BD71837_INT_ON_REQ_MASK), + REGMAP_IRQ_REG(BD71837_INT_STBY_REQ, 0, BD71837_INT_STBY_REQ_MASK), +}; + +static struct regmap_irq_chip bd71837_irq_chip = { + .name = "bd71837-irq", + .irqs = bd71837_irqs, + .num_irqs = ARRAY_SIZE(bd71837_irqs), + .num_regs = 1, + .irq_reg_stride = 1, + .status_base = BD71837_REG_IRQ, + .mask_base = BD71837_REG_MIRQ, + .ack_base = BD71837_REG_IRQ, + .init_ack_masked = true, + .mask_invert = false, +}; + +static const struct regmap_range pmic_status_range = { + .range_min = BD71837_REG_IRQ, + .range_max = BD71837_REG_POW_STATE, +}; + +static const struct regmap_access_table volatile_regs = { + .yes_ranges = &pmic_status_range, + .n_yes_ranges = 1, +}; + +static const struct regmap_config bd71837_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .volatile_table = &volatile_regs, + .max_register = BD71837_MAX_REGISTER - 1, + .cache_type = REGCACHE_RBTREE, +}; + +static int bd71837_i2c_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct bd71837 *bd71837; + int ret, i; + unsigned int val; + + bd71837 = devm_kzalloc(&i2c->dev, sizeof(struct bd71837), GFP_KERNEL); + + if (!bd71837) + return -ENOMEM; + + bd71837->chip_irq = i2c->irq; + + if (!bd71837->chip_irq) { + dev_err(&i2c->dev, "No IRQ configured\n"); + return -EINVAL; + } + + bd71837->dev = &i2c->dev; + dev_set_drvdata(&i2c->dev, bd71837); + + bd71837->regmap = devm_regmap_init_i2c(i2c, &bd71837_regmap_config); + if (IS_ERR(bd71837->regmap)) { + dev_err(&i2c->dev, "regmap initialization failed\n"); + return PTR_ERR(bd71837->regmap); + } + + ret = regmap_read(bd71837->regmap, BD71837_REG_REV, &val); + if (ret) { + dev_err(&i2c->dev, "Read BD71837_REG_DEVICE failed\n"); + return ret; + } + for (i = 0; i < ARRAY_SIZE(supported_revisions); i++) + if (supported_revisions[i] == val) + break; + + if (i == ARRAY_SIZE(supported_revisions)) { + dev_err(&i2c->dev, "Unsupported chip revision\n"); + return -ENODEV; + } + + ret = devm_regmap_add_irq_chip(&i2c->dev, bd71837->regmap, + bd71837->chip_irq, IRQF_ONESHOT, 0, + &bd71837_irq_chip, &bd71837->irq_data); + if (ret) { + dev_err(&i2c->dev, "Failed to add irq_chip\n"); + return ret; + } + + /* Configure short press to 10 milliseconds */ + ret = regmap_update_bits(bd71837->regmap, + BD71837_REG_PWRONCONFIG0, + BD718XX_PWRBTN_PRESS_DURATION_MASK, + BD718XX_PWRBTN_SHORT_PRESS_10MS); + if (ret) { + dev_err(&i2c->dev, + "Failed to configure button short press timeout\n"); + return ret; + } + + /* Configure long press to 10 seconds */ + ret = regmap_update_bits(bd71837->regmap, + BD71837_REG_PWRONCONFIG1, + BD718XX_PWRBTN_PRESS_DURATION_MASK, + BD718XX_PWRBTN_LONG_PRESS_10S); + + if (ret) { + dev_err(&i2c->dev, + "Failed to configure button long press timeout\n"); + return ret; + } + + ret = regmap_irq_get_virq(bd71837->irq_data, BD71837_INT_PWRBTN_S); + + if (ret < 0) { + dev_err(&i2c->dev, "Failed to get the IRQ\n"); + return ret; + } + + button.irq = ret; + + ret = devm_mfd_add_devices(bd71837->dev, PLATFORM_DEVID_AUTO, + bd71837_mfd_cells, + ARRAY_SIZE(bd71837_mfd_cells), NULL, 0, + regmap_irq_get_domain(bd71837->irq_data)); + if (ret) + dev_err(&i2c->dev, "Failed to create subdevices\n"); + + return ret; +} + +static const struct of_device_id bd71837_of_match[] = { + { .compatible = "rohm,bd71837", }, + { } +}; +MODULE_DEVICE_TABLE(of, bd71837_of_match); + +static struct i2c_driver bd71837_i2c_driver = { + .driver = { + .name = "rohm-bd718x7", + .of_match_table = bd71837_of_match, + }, + .probe = bd71837_i2c_probe, +}; + +static int __init bd71837_i2c_init(void) +{ + return i2c_add_driver(&bd71837_i2c_driver); +} + +/* Initialise early so consumer devices can complete system boot */ +subsys_initcall(bd71837_i2c_init); + +static void __exit bd71837_i2c_exit(void) +{ + i2c_del_driver(&bd71837_i2c_driver); +} +module_exit(bd71837_i2c_exit); + +MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>"); +MODULE_DESCRIPTION("ROHM BD71837 Power Management IC driver"); +MODULE_LICENSE("GPL"); |