diff options
Diffstat (limited to 'drivers/mfd/rohm-bd718x7.c')
| -rw-r--r-- | drivers/mfd/rohm-bd718x7.c | 286 |
1 files changed, 286 insertions, 0 deletions
diff --git a/drivers/mfd/rohm-bd718x7.c b/drivers/mfd/rohm-bd718x7.c new file mode 100644 index 000000000..be2acc429 --- /dev/null +++ b/drivers/mfd/rohm-bd718x7.c @@ -0,0 +1,286 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +// +// Copyright (C) 2018 ROHM Semiconductors +// +// ROHM BD71837MWV and BD71847MWV PMIC driver +// +// Datasheet for BD71837MWV available from +// https://www.rohm.com/datasheet/BD71837MWV/bd71837mwv-e + +#include <linux/device/devres.h> +#include <linux/gfp_types.h> +#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/of.h> +#include <linux/property.h> +#include <linux/regmap.h> +#include <linux/types.h> + +static struct mfd_cell bd71837_mfd_cells[] = { + { .name = "bd71837-clk", }, + { .name = "bd71837-pmic", }, +}; + +static struct mfd_cell bd71847_mfd_cells[] = { + { .name = "bd71847-clk", }, + { .name = "bd71847-pmic", }, +}; + +static const struct regmap_irq bd718xx_irqs[] = { + REGMAP_IRQ_REG(BD718XX_INT_SWRST, 0, BD718XX_INT_SWRST_MASK), + REGMAP_IRQ_REG(BD718XX_INT_PWRBTN_S, 0, BD718XX_INT_PWRBTN_S_MASK), + REGMAP_IRQ_REG(BD718XX_INT_PWRBTN_L, 0, BD718XX_INT_PWRBTN_L_MASK), + REGMAP_IRQ_REG(BD718XX_INT_PWRBTN, 0, BD718XX_INT_PWRBTN_MASK), + REGMAP_IRQ_REG(BD718XX_INT_WDOG, 0, BD718XX_INT_WDOG_MASK), + REGMAP_IRQ_REG(BD718XX_INT_ON_REQ, 0, BD718XX_INT_ON_REQ_MASK), + REGMAP_IRQ_REG(BD718XX_INT_STBY_REQ, 0, BD718XX_INT_STBY_REQ_MASK), +}; + +static const struct regmap_irq_chip bd718xx_irq_chip = { + .name = "bd718xx-irq", + .irqs = bd718xx_irqs, + .num_irqs = ARRAY_SIZE(bd718xx_irqs), + .num_regs = 1, + .irq_reg_stride = 1, + .status_base = BD718XX_REG_IRQ, + .mask_base = BD718XX_REG_MIRQ, + .ack_base = BD718XX_REG_IRQ, + .init_ack_masked = true, +}; + +static const struct regmap_range pmic_status_range[] = { + regmap_reg_range(BD718XX_REG_IRQ, BD718XX_REG_POW_STATE), +}; + +static const struct regmap_access_table volatile_regs = { + .yes_ranges = &pmic_status_range[0], + .n_yes_ranges = ARRAY_SIZE(pmic_status_range), +}; + +static const struct regmap_config bd718xx_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .volatile_table = &volatile_regs, + .max_register = BD718XX_MAX_REGISTER - 1, + .cache_type = REGCACHE_MAPLE, +}; + +static int bd718xx_init_press_duration(struct regmap *regmap, + struct device *dev) +{ + u32 short_press_ms, long_press_ms; + u32 short_press_value, long_press_value; + int ret; + + ret = of_property_read_u32(dev->of_node, "rohm,short-press-ms", + &short_press_ms); + if (!ret) { + short_press_value = min(15u, (short_press_ms + 250) / 500); + ret = regmap_update_bits(regmap, BD718XX_REG_PWRONCONFIG0, + BD718XX_PWRBTN_PRESS_DURATION_MASK, + short_press_value); + if (ret) { + dev_err(dev, "Failed to init pwron short press\n"); + return ret; + } + } + + ret = of_property_read_u32(dev->of_node, "rohm,long-press-ms", + &long_press_ms); + if (!ret) { + long_press_value = min(15u, (long_press_ms + 500) / 1000); + ret = regmap_update_bits(regmap, BD718XX_REG_PWRONCONFIG1, + BD718XX_PWRBTN_PRESS_DURATION_MASK, + long_press_value); + if (ret) { + dev_err(dev, "Failed to init pwron long press\n"); + return ret; + } + } + + return 0; +} + +static const struct property_entry bd718xx_powerkey_parent_props[] = { + PROPERTY_ENTRY_STRING("label", "bd718xx-pwrkey"), + { } +}; + +static const struct property_entry bd718xx_powerkey_props[] = { + PROPERTY_ENTRY_U32("linux,code", KEY_POWER), + { } +}; + +static const struct resource bd718xx_powerkey_resources[] = { + DEFINE_RES_IRQ_NAMED(BD718XX_INT_PWRBTN_S, "bd718xx-pwrkey"), +}; + +#define GPIO_KEYS 0 /* Node corresponding to gpio-keys device itself */ +#define PWRON_KEY 1 /* Node describing power button in gpio-keys */ + +static int bd718xx_i2c_register_swnodes(const struct software_node *nodes) +{ + const struct software_node * const node_group[] = { + &nodes[GPIO_KEYS], &nodes[PWRON_KEY], NULL + }; + + return software_node_register_node_group(node_group); +} + +static void bd718xx_i2c_unregister_swnodes(void *data) +{ + const struct software_node *nodes = data; + const struct software_node * const node_group[] = { + &nodes[GPIO_KEYS], &nodes[PWRON_KEY], NULL + }; + + software_node_unregister_node_group(node_group); +} + +static int bd718xx_i2c_register_pwrbutton(struct device *dev, + struct irq_domain *irq_domain) +{ + struct mfd_cell gpio_keys_cell = { + .name = "gpio-keys", + .resources = bd718xx_powerkey_resources, + .num_resources = ARRAY_SIZE(bd718xx_powerkey_resources), + }; + struct software_node *nodes; + int ret; + + nodes = devm_kcalloc(dev, 2, sizeof(*nodes), GFP_KERNEL); + if (!nodes) + return -ENOMEM; + + nodes[GPIO_KEYS].name = devm_kasprintf(dev, GFP_KERNEL, "%s-power-key", dev_name(dev)); + if (!nodes[GPIO_KEYS].name) + return -ENOMEM; + + nodes[GPIO_KEYS].properties = bd718xx_powerkey_parent_props; + + nodes[PWRON_KEY].parent = &nodes[GPIO_KEYS]; + nodes[PWRON_KEY].properties = bd718xx_powerkey_props; + + ret = bd718xx_i2c_register_swnodes(nodes); + if (ret) + return ret; + + ret = devm_add_action_or_reset(dev, bd718xx_i2c_unregister_swnodes, nodes); + if (ret) + return ret; + + gpio_keys_cell.swnode = &nodes[GPIO_KEYS]; + + ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, &gpio_keys_cell, 1, + NULL, 0, irq_domain); + if (ret) + return dev_err_probe(dev, ret, "Failed to register power-button"); + + return 0; +} + +static int bd718xx_i2c_probe(struct i2c_client *i2c) +{ + struct regmap *regmap; + struct regmap_irq_chip_data *irq_data; + struct irq_domain *irq_domain; + int ret; + unsigned int chip_type; + struct mfd_cell *mfd; + int cells; + + if (!i2c->irq) { + dev_err(&i2c->dev, "No IRQ configured\n"); + return -EINVAL; + } + chip_type = (unsigned int)(uintptr_t) + of_device_get_match_data(&i2c->dev); + switch (chip_type) { + case ROHM_CHIP_TYPE_BD71837: + mfd = bd71837_mfd_cells; + cells = ARRAY_SIZE(bd71837_mfd_cells); + break; + case ROHM_CHIP_TYPE_BD71847: + mfd = bd71847_mfd_cells; + cells = ARRAY_SIZE(bd71847_mfd_cells); + break; + default: + dev_err(&i2c->dev, "Unknown device type"); + return -EINVAL; + } + + regmap = devm_regmap_init_i2c(i2c, &bd718xx_regmap_config); + if (IS_ERR(regmap)) + return dev_err_probe(&i2c->dev, PTR_ERR(regmap), + "regmap initialization failed\n"); + + ret = devm_regmap_add_irq_chip(&i2c->dev, regmap, i2c->irq, + IRQF_ONESHOT, 0, &bd718xx_irq_chip, + &irq_data); + if (ret) + return dev_err_probe(&i2c->dev, ret, "Failed to add irq_chip\n"); + + ret = bd718xx_init_press_duration(regmap, &i2c->dev); + if (ret) + return ret; + + irq_domain = regmap_irq_get_domain(irq_data); + + ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, + mfd, cells, NULL, 0, irq_domain); + if (ret) + return dev_err_probe(&i2c->dev, ret, "Failed to create subdevices\n"); + + ret = bd718xx_i2c_register_pwrbutton(&i2c->dev, irq_domain); + if (ret) + return ret; + + return 0; +} + +static const struct of_device_id bd718xx_of_match[] = { + { + .compatible = "rohm,bd71837", + .data = (void *)ROHM_CHIP_TYPE_BD71837, + }, + { + .compatible = "rohm,bd71847", + .data = (void *)ROHM_CHIP_TYPE_BD71847, + }, + { + .compatible = "rohm,bd71850", + .data = (void *)ROHM_CHIP_TYPE_BD71847, + }, + { } +}; +MODULE_DEVICE_TABLE(of, bd718xx_of_match); + +static struct i2c_driver bd718xx_i2c_driver = { + .driver = { + .name = "rohm-bd718x7", + .of_match_table = bd718xx_of_match, + }, + .probe = bd718xx_i2c_probe, +}; + +static int __init bd718xx_i2c_init(void) +{ + return i2c_add_driver(&bd718xx_i2c_driver); +} + +/* Initialise early so consumer devices can complete system boot */ +subsys_initcall(bd718xx_i2c_init); + +static void __exit bd718xx_i2c_exit(void) +{ + i2c_del_driver(&bd718xx_i2c_driver); +} +module_exit(bd718xx_i2c_exit); + +MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>"); +MODULE_DESCRIPTION("ROHM BD71837/BD71847 Power Management IC driver"); +MODULE_LICENSE("GPL"); |