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282 lines
7.6 KiB
282 lines
7.6 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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// |
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// max77686.c - mfd core driver for the Maxim 77686/802 |
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// |
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// Copyright (C) 2012 Samsung Electronics |
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// Chiwoong Byun <[email protected]> |
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// Jonghwa Lee <[email protected]> |
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// |
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//This driver is based on max8997.c |
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#include <linux/export.h> |
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#include <linux/slab.h> |
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#include <linux/i2c.h> |
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#include <linux/irq.h> |
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#include <linux/interrupt.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/module.h> |
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#include <linux/mfd/core.h> |
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#include <linux/mfd/max77686.h> |
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#include <linux/mfd/max77686-private.h> |
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#include <linux/err.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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static const struct mfd_cell max77686_devs[] = { |
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{ .name = "max77686-pmic", }, |
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{ .name = "max77686-rtc", }, |
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{ .name = "max77686-clk", }, |
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}; |
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static const struct mfd_cell max77802_devs[] = { |
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{ .name = "max77802-pmic", }, |
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{ .name = "max77802-clk", }, |
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{ .name = "max77802-rtc", }, |
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}; |
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static bool max77802_pmic_is_accessible_reg(struct device *dev, |
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unsigned int reg) |
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{ |
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return reg < MAX77802_REG_PMIC_END; |
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} |
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static bool max77802_rtc_is_accessible_reg(struct device *dev, |
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unsigned int reg) |
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{ |
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return (reg >= MAX77802_RTC_INT && reg < MAX77802_RTC_END); |
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} |
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static bool max77802_is_accessible_reg(struct device *dev, unsigned int reg) |
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{ |
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return (max77802_pmic_is_accessible_reg(dev, reg) || |
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max77802_rtc_is_accessible_reg(dev, reg)); |
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} |
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static bool max77802_pmic_is_precious_reg(struct device *dev, unsigned int reg) |
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{ |
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return (reg == MAX77802_REG_INTSRC || reg == MAX77802_REG_INT1 || |
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reg == MAX77802_REG_INT2); |
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} |
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static bool max77802_rtc_is_precious_reg(struct device *dev, unsigned int reg) |
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{ |
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return (reg == MAX77802_RTC_INT || |
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reg == MAX77802_RTC_UPDATE0 || |
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reg == MAX77802_RTC_UPDATE1); |
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} |
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static bool max77802_is_precious_reg(struct device *dev, unsigned int reg) |
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{ |
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return (max77802_pmic_is_precious_reg(dev, reg) || |
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max77802_rtc_is_precious_reg(dev, reg)); |
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} |
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static bool max77802_pmic_is_volatile_reg(struct device *dev, unsigned int reg) |
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{ |
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return (max77802_is_precious_reg(dev, reg) || |
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reg == MAX77802_REG_STATUS1 || reg == MAX77802_REG_STATUS2 || |
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reg == MAX77802_REG_PWRON); |
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} |
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static bool max77802_rtc_is_volatile_reg(struct device *dev, unsigned int reg) |
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{ |
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return (max77802_rtc_is_precious_reg(dev, reg) || |
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reg == MAX77802_RTC_SEC || |
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reg == MAX77802_RTC_MIN || |
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reg == MAX77802_RTC_HOUR || |
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reg == MAX77802_RTC_WEEKDAY || |
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reg == MAX77802_RTC_MONTH || |
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reg == MAX77802_RTC_YEAR || |
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reg == MAX77802_RTC_DATE); |
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} |
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static bool max77802_is_volatile_reg(struct device *dev, unsigned int reg) |
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{ |
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return (max77802_pmic_is_volatile_reg(dev, reg) || |
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max77802_rtc_is_volatile_reg(dev, reg)); |
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} |
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static const struct regmap_config max77686_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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}; |
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static const struct regmap_config max77802_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.writeable_reg = max77802_is_accessible_reg, |
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.readable_reg = max77802_is_accessible_reg, |
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.precious_reg = max77802_is_precious_reg, |
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.volatile_reg = max77802_is_volatile_reg, |
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.name = "max77802-pmic", |
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.cache_type = REGCACHE_RBTREE, |
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}; |
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static const struct regmap_irq max77686_irqs[] = { |
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/* INT1 interrupts */ |
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{ .reg_offset = 0, .mask = MAX77686_INT1_PWRONF_MSK, }, |
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{ .reg_offset = 0, .mask = MAX77686_INT1_PWRONR_MSK, }, |
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{ .reg_offset = 0, .mask = MAX77686_INT1_JIGONBF_MSK, }, |
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{ .reg_offset = 0, .mask = MAX77686_INT1_JIGONBR_MSK, }, |
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{ .reg_offset = 0, .mask = MAX77686_INT1_ACOKBF_MSK, }, |
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{ .reg_offset = 0, .mask = MAX77686_INT1_ACOKBR_MSK, }, |
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{ .reg_offset = 0, .mask = MAX77686_INT1_ONKEY1S_MSK, }, |
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{ .reg_offset = 0, .mask = MAX77686_INT1_MRSTB_MSK, }, |
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/* INT2 interrupts */ |
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{ .reg_offset = 1, .mask = MAX77686_INT2_140C_MSK, }, |
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{ .reg_offset = 1, .mask = MAX77686_INT2_120C_MSK, }, |
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}; |
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static const struct regmap_irq_chip max77686_irq_chip = { |
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.name = "max77686-pmic", |
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.status_base = MAX77686_REG_INT1, |
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.mask_base = MAX77686_REG_INT1MSK, |
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.num_regs = 2, |
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.irqs = max77686_irqs, |
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.num_irqs = ARRAY_SIZE(max77686_irqs), |
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}; |
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static const struct regmap_irq_chip max77802_irq_chip = { |
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.name = "max77802-pmic", |
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.status_base = MAX77802_REG_INT1, |
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.mask_base = MAX77802_REG_INT1MSK, |
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.num_regs = 2, |
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.irqs = max77686_irqs, /* same masks as 77686 */ |
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.num_irqs = ARRAY_SIZE(max77686_irqs), |
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}; |
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static const struct of_device_id max77686_pmic_dt_match[] = { |
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{ |
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.compatible = "maxim,max77686", |
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.data = (void *)TYPE_MAX77686, |
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}, |
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{ |
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.compatible = "maxim,max77802", |
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.data = (void *)TYPE_MAX77802, |
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}, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, max77686_pmic_dt_match); |
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static int max77686_i2c_probe(struct i2c_client *i2c) |
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{ |
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struct max77686_dev *max77686 = NULL; |
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unsigned int data; |
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int ret = 0; |
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const struct regmap_config *config; |
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const struct regmap_irq_chip *irq_chip; |
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const struct mfd_cell *cells; |
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int n_devs; |
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max77686 = devm_kzalloc(&i2c->dev, |
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sizeof(struct max77686_dev), GFP_KERNEL); |
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if (!max77686) |
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return -ENOMEM; |
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i2c_set_clientdata(i2c, max77686); |
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max77686->type = (unsigned long)of_device_get_match_data(&i2c->dev); |
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max77686->dev = &i2c->dev; |
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max77686->i2c = i2c; |
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max77686->irq = i2c->irq; |
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if (max77686->type == TYPE_MAX77686) { |
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config = &max77686_regmap_config; |
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irq_chip = &max77686_irq_chip; |
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cells = max77686_devs; |
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n_devs = ARRAY_SIZE(max77686_devs); |
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} else { |
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config = &max77802_regmap_config; |
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irq_chip = &max77802_irq_chip; |
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cells = max77802_devs; |
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n_devs = ARRAY_SIZE(max77802_devs); |
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} |
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max77686->regmap = devm_regmap_init_i2c(i2c, config); |
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if (IS_ERR(max77686->regmap)) { |
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ret = PTR_ERR(max77686->regmap); |
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dev_err(max77686->dev, "Failed to allocate register map: %d\n", |
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ret); |
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return ret; |
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} |
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ret = regmap_read(max77686->regmap, MAX77686_REG_DEVICE_ID, &data); |
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if (ret < 0) { |
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dev_err(max77686->dev, |
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"device not found on this channel (this is not an error)\n"); |
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return -ENODEV; |
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} |
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ret = devm_regmap_add_irq_chip(&i2c->dev, max77686->regmap, |
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max77686->irq, |
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT | |
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IRQF_SHARED, 0, irq_chip, |
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&max77686->irq_data); |
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if (ret < 0) { |
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dev_err(&i2c->dev, "failed to add PMIC irq chip: %d\n", ret); |
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return ret; |
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} |
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ret = devm_mfd_add_devices(max77686->dev, -1, cells, n_devs, NULL, |
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0, NULL); |
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if (ret < 0) { |
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dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret); |
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return ret; |
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} |
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return 0; |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int max77686_suspend(struct device *dev) |
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{ |
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struct i2c_client *i2c = to_i2c_client(dev); |
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struct max77686_dev *max77686 = i2c_get_clientdata(i2c); |
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if (device_may_wakeup(dev)) |
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enable_irq_wake(max77686->irq); |
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/* |
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* IRQ must be disabled during suspend because if it happens |
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* while suspended it will be handled before resuming I2C. |
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* |
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* When device is woken up from suspend (e.g. by RTC wake alarm), |
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* an interrupt occurs before resuming I2C bus controller. |
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* Interrupt handler tries to read registers but this read |
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* will fail because I2C is still suspended. |
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*/ |
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disable_irq(max77686->irq); |
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return 0; |
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} |
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static int max77686_resume(struct device *dev) |
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{ |
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struct i2c_client *i2c = to_i2c_client(dev); |
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struct max77686_dev *max77686 = i2c_get_clientdata(i2c); |
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if (device_may_wakeup(dev)) |
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disable_irq_wake(max77686->irq); |
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enable_irq(max77686->irq); |
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return 0; |
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} |
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#endif /* CONFIG_PM_SLEEP */ |
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static SIMPLE_DEV_PM_OPS(max77686_pm, max77686_suspend, max77686_resume); |
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static struct i2c_driver max77686_i2c_driver = { |
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.driver = { |
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.name = "max77686", |
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.pm = &max77686_pm, |
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.of_match_table = max77686_pmic_dt_match, |
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}, |
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.probe_new = max77686_i2c_probe, |
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}; |
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module_i2c_driver(max77686_i2c_driver); |
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MODULE_DESCRIPTION("MAXIM 77686/802 multi-function core driver"); |
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MODULE_AUTHOR("Chiwoong Byun <[email protected]>"); |
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MODULE_LICENSE("GPL");
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