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Diffstat (limited to '')
| -rw-r--r-- | drivers/mfd/max77686.c | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/drivers/mfd/max77686.c b/drivers/mfd/max77686.c new file mode 100644 index 000000000..2ac64277f --- /dev/null +++ b/drivers/mfd/max77686.c @@ -0,0 +1,281 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// max77686.c - mfd core driver for the Maxim 77686/802 +// +// Copyright (C) 2012 Samsung Electronics +// Chiwoong Byun <woong.byun@samsung.com> +// Jonghwa Lee <jonghwa3.lee@samsung.com> +// +//This driver is based on max8997.c + +#include <linux/export.h> +#include <linux/slab.h> +#include <linux/i2c.h> +#include <linux/irq.h> +#include <linux/interrupt.h> +#include <linux/pm_runtime.h> +#include <linux/module.h> +#include <linux/mfd/core.h> +#include <linux/mfd/max77686.h> +#include <linux/mfd/max77686-private.h> +#include <linux/err.h> +#include <linux/of.h> +#include <linux/of_device.h> + +static const struct mfd_cell max77686_devs[] = { + { .name = "max77686-pmic", }, + { .name = "max77686-rtc", }, + { .name = "max77686-clk", }, +}; + +static const struct mfd_cell max77802_devs[] = { + { .name = "max77802-pmic", }, + { .name = "max77802-clk", }, + { .name = "max77802-rtc", }, +}; + +static bool max77802_pmic_is_accessible_reg(struct device *dev, + unsigned int reg) +{ + return reg < MAX77802_REG_PMIC_END; +} + +static bool max77802_rtc_is_accessible_reg(struct device *dev, + unsigned int reg) +{ + return (reg >= MAX77802_RTC_INT && reg < MAX77802_RTC_END); +} + +static bool max77802_is_accessible_reg(struct device *dev, unsigned int reg) +{ + return (max77802_pmic_is_accessible_reg(dev, reg) || + max77802_rtc_is_accessible_reg(dev, reg)); +} + +static bool max77802_pmic_is_precious_reg(struct device *dev, unsigned int reg) +{ + return (reg == MAX77802_REG_INTSRC || reg == MAX77802_REG_INT1 || + reg == MAX77802_REG_INT2); +} + +static bool max77802_rtc_is_precious_reg(struct device *dev, unsigned int reg) +{ + return (reg == MAX77802_RTC_INT || + reg == MAX77802_RTC_UPDATE0 || + reg == MAX77802_RTC_UPDATE1); +} + +static bool max77802_is_precious_reg(struct device *dev, unsigned int reg) +{ + return (max77802_pmic_is_precious_reg(dev, reg) || + max77802_rtc_is_precious_reg(dev, reg)); +} + +static bool max77802_pmic_is_volatile_reg(struct device *dev, unsigned int reg) +{ + return (max77802_is_precious_reg(dev, reg) || + reg == MAX77802_REG_STATUS1 || reg == MAX77802_REG_STATUS2 || + reg == MAX77802_REG_PWRON); +} + +static bool max77802_rtc_is_volatile_reg(struct device *dev, unsigned int reg) +{ + return (max77802_rtc_is_precious_reg(dev, reg) || + reg == MAX77802_RTC_SEC || + reg == MAX77802_RTC_MIN || + reg == MAX77802_RTC_HOUR || + reg == MAX77802_RTC_WEEKDAY || + reg == MAX77802_RTC_MONTH || + reg == MAX77802_RTC_YEAR || + reg == MAX77802_RTC_MONTHDAY); +} + +static bool max77802_is_volatile_reg(struct device *dev, unsigned int reg) +{ + return (max77802_pmic_is_volatile_reg(dev, reg) || + max77802_rtc_is_volatile_reg(dev, reg)); +} + +static const struct regmap_config max77686_regmap_config = { + .reg_bits = 8, + .val_bits = 8, +}; + +static const struct regmap_config max77802_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .writeable_reg = max77802_is_accessible_reg, + .readable_reg = max77802_is_accessible_reg, + .precious_reg = max77802_is_precious_reg, + .volatile_reg = max77802_is_volatile_reg, + .name = "max77802-pmic", + .cache_type = REGCACHE_RBTREE, +}; + +static const struct regmap_irq max77686_irqs[] = { + /* INT1 interrupts */ + { .reg_offset = 0, .mask = MAX77686_INT1_PWRONF_MSK, }, + { .reg_offset = 0, .mask = MAX77686_INT1_PWRONR_MSK, }, + { .reg_offset = 0, .mask = MAX77686_INT1_JIGONBF_MSK, }, + { .reg_offset = 0, .mask = MAX77686_INT1_JIGONBR_MSK, }, + { .reg_offset = 0, .mask = MAX77686_INT1_ACOKBF_MSK, }, + { .reg_offset = 0, .mask = MAX77686_INT1_ACOKBR_MSK, }, + { .reg_offset = 0, .mask = MAX77686_INT1_ONKEY1S_MSK, }, + { .reg_offset = 0, .mask = MAX77686_INT1_MRSTB_MSK, }, + /* INT2 interrupts */ + { .reg_offset = 1, .mask = MAX77686_INT2_140C_MSK, }, + { .reg_offset = 1, .mask = MAX77686_INT2_120C_MSK, }, +}; + +static const struct regmap_irq_chip max77686_irq_chip = { + .name = "max77686-pmic", + .status_base = MAX77686_REG_INT1, + .mask_base = MAX77686_REG_INT1MSK, + .num_regs = 2, + .irqs = max77686_irqs, + .num_irqs = ARRAY_SIZE(max77686_irqs), +}; + +static const struct regmap_irq_chip max77802_irq_chip = { + .name = "max77802-pmic", + .status_base = MAX77802_REG_INT1, + .mask_base = MAX77802_REG_INT1MSK, + .num_regs = 2, + .irqs = max77686_irqs, /* same masks as 77686 */ + .num_irqs = ARRAY_SIZE(max77686_irqs), +}; + +static const struct of_device_id max77686_pmic_dt_match[] = { + { + .compatible = "maxim,max77686", + .data = (void *)TYPE_MAX77686, + }, + { + .compatible = "maxim,max77802", + .data = (void *)TYPE_MAX77802, + }, + { }, +}; +MODULE_DEVICE_TABLE(of, max77686_pmic_dt_match); + +static int max77686_i2c_probe(struct i2c_client *i2c) +{ + struct max77686_dev *max77686 = NULL; + unsigned int data; + int ret = 0; + const struct regmap_config *config; + const struct regmap_irq_chip *irq_chip; + const struct mfd_cell *cells; + int n_devs; + + max77686 = devm_kzalloc(&i2c->dev, + sizeof(struct max77686_dev), GFP_KERNEL); + if (!max77686) + return -ENOMEM; + + i2c_set_clientdata(i2c, max77686); + max77686->type = (unsigned long)of_device_get_match_data(&i2c->dev); + max77686->dev = &i2c->dev; + max77686->i2c = i2c; + + max77686->irq = i2c->irq; + + if (max77686->type == TYPE_MAX77686) { + config = &max77686_regmap_config; + irq_chip = &max77686_irq_chip; + cells = max77686_devs; + n_devs = ARRAY_SIZE(max77686_devs); + } else { + config = &max77802_regmap_config; + irq_chip = &max77802_irq_chip; + cells = max77802_devs; + n_devs = ARRAY_SIZE(max77802_devs); + } + + max77686->regmap = devm_regmap_init_i2c(i2c, config); + if (IS_ERR(max77686->regmap)) { + ret = PTR_ERR(max77686->regmap); + dev_err(max77686->dev, "Failed to allocate register map: %d\n", + ret); + return ret; + } + + ret = regmap_read(max77686->regmap, MAX77686_REG_DEVICE_ID, &data); + if (ret < 0) { + dev_err(max77686->dev, + "device not found on this channel (this is not an error)\n"); + return -ENODEV; + } + + ret = devm_regmap_add_irq_chip(&i2c->dev, max77686->regmap, + max77686->irq, + IRQF_ONESHOT | IRQF_SHARED, 0, irq_chip, + &max77686->irq_data); + if (ret < 0) { + dev_err(&i2c->dev, "failed to add PMIC irq chip: %d\n", ret); + return ret; + } + + ret = devm_mfd_add_devices(max77686->dev, -1, cells, n_devs, NULL, + 0, NULL); + if (ret < 0) { + dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret); + return ret; + } + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int max77686_suspend(struct device *dev) +{ + struct i2c_client *i2c = to_i2c_client(dev); + struct max77686_dev *max77686 = i2c_get_clientdata(i2c); + + if (device_may_wakeup(dev)) + enable_irq_wake(max77686->irq); + + /* + * IRQ must be disabled during suspend because if it happens + * while suspended it will be handled before resuming I2C. + * + * When device is woken up from suspend (e.g. by RTC wake alarm), + * an interrupt occurs before resuming I2C bus controller. + * Interrupt handler tries to read registers but this read + * will fail because I2C is still suspended. + */ + disable_irq(max77686->irq); + + return 0; +} + +static int max77686_resume(struct device *dev) +{ + struct i2c_client *i2c = to_i2c_client(dev); + struct max77686_dev *max77686 = i2c_get_clientdata(i2c); + + if (device_may_wakeup(dev)) + disable_irq_wake(max77686->irq); + + enable_irq(max77686->irq); + + return 0; +} +#endif /* CONFIG_PM_SLEEP */ + +static SIMPLE_DEV_PM_OPS(max77686_pm, max77686_suspend, max77686_resume); + +static struct i2c_driver max77686_i2c_driver = { + .driver = { + .name = "max77686", + .pm = &max77686_pm, + .of_match_table = max77686_pmic_dt_match, + }, + .probe_new = max77686_i2c_probe, +}; + +module_i2c_driver(max77686_i2c_driver); + +MODULE_DESCRIPTION("MAXIM 77686/802 multi-function core driver"); +MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>"); +MODULE_LICENSE("GPL"); |