// SPDX-License-Identifier: GPL-2.0+ // // max77686.c - mfd core driver for the Maxim 77686/802 // // Copyright (C) 2012 Samsung Electronics // Chiwoong Byun // Jonghwa Lee // //This driver is based on max8997.c #include #include #include #include #include #include #include #include #include #include #include #include #include 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_DATE); } 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_TRIGGER_FALLING | 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 = of_match_ptr(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 "); MODULE_LICENSE("GPL");