352 lines
9.1 KiB
C
352 lines
9.1 KiB
C
/*
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* max8907.c - mfd driver for MAX8907
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*
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* Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>
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* Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/max8907.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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static const struct mfd_cell max8907_cells[] = {
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{ .name = "max8907-regulator", },
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{ .name = "max8907-rtc", },
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};
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static bool max8907_gen_is_volatile_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case MAX8907_REG_ON_OFF_IRQ1:
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case MAX8907_REG_ON_OFF_STAT:
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case MAX8907_REG_ON_OFF_IRQ2:
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case MAX8907_REG_CHG_IRQ1:
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case MAX8907_REG_CHG_IRQ2:
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case MAX8907_REG_CHG_STAT:
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return true;
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default:
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return false;
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}
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}
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static bool max8907_gen_is_precious_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case MAX8907_REG_ON_OFF_IRQ1:
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case MAX8907_REG_ON_OFF_IRQ2:
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case MAX8907_REG_CHG_IRQ1:
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case MAX8907_REG_CHG_IRQ2:
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return true;
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default:
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return false;
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}
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}
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static bool max8907_gen_is_writeable_reg(struct device *dev, unsigned int reg)
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{
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return !max8907_gen_is_volatile_reg(dev, reg);
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}
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static const struct regmap_config max8907_regmap_gen_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.volatile_reg = max8907_gen_is_volatile_reg,
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.precious_reg = max8907_gen_is_precious_reg,
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.writeable_reg = max8907_gen_is_writeable_reg,
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.max_register = MAX8907_REG_LDO20VOUT,
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.cache_type = REGCACHE_RBTREE,
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};
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static bool max8907_rtc_is_volatile_reg(struct device *dev, unsigned int reg)
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{
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if (reg <= MAX8907_REG_RTC_YEAR2)
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return true;
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switch (reg) {
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case MAX8907_REG_RTC_STATUS:
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case MAX8907_REG_RTC_IRQ:
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return true;
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default:
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return false;
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}
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}
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static bool max8907_rtc_is_precious_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case MAX8907_REG_RTC_IRQ:
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return true;
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default:
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return false;
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}
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}
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static bool max8907_rtc_is_writeable_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case MAX8907_REG_RTC_STATUS:
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case MAX8907_REG_RTC_IRQ:
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return false;
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default:
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return true;
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}
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}
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static const struct regmap_config max8907_regmap_rtc_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.volatile_reg = max8907_rtc_is_volatile_reg,
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.precious_reg = max8907_rtc_is_precious_reg,
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.writeable_reg = max8907_rtc_is_writeable_reg,
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.max_register = MAX8907_REG_MPL_CNTL,
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.cache_type = REGCACHE_RBTREE,
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};
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static const struct regmap_irq max8907_chg_irqs[] = {
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{ .reg_offset = 0, .mask = 1 << 0, },
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{ .reg_offset = 0, .mask = 1 << 1, },
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{ .reg_offset = 0, .mask = 1 << 2, },
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{ .reg_offset = 1, .mask = 1 << 0, },
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{ .reg_offset = 1, .mask = 1 << 1, },
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{ .reg_offset = 1, .mask = 1 << 2, },
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{ .reg_offset = 1, .mask = 1 << 3, },
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{ .reg_offset = 1, .mask = 1 << 4, },
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{ .reg_offset = 1, .mask = 1 << 5, },
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{ .reg_offset = 1, .mask = 1 << 6, },
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{ .reg_offset = 1, .mask = 1 << 7, },
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};
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static const struct regmap_irq_chip max8907_chg_irq_chip = {
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.name = "max8907 chg",
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.status_base = MAX8907_REG_CHG_IRQ1,
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.mask_base = MAX8907_REG_CHG_IRQ1_MASK,
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.wake_base = MAX8907_REG_CHG_IRQ1_MASK,
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.irq_reg_stride = MAX8907_REG_CHG_IRQ2 - MAX8907_REG_CHG_IRQ1,
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.num_regs = 2,
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.irqs = max8907_chg_irqs,
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.num_irqs = ARRAY_SIZE(max8907_chg_irqs),
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};
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static const struct regmap_irq max8907_on_off_irqs[] = {
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{ .reg_offset = 0, .mask = 1 << 0, },
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{ .reg_offset = 0, .mask = 1 << 1, },
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{ .reg_offset = 0, .mask = 1 << 2, },
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{ .reg_offset = 0, .mask = 1 << 3, },
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{ .reg_offset = 0, .mask = 1 << 4, },
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{ .reg_offset = 0, .mask = 1 << 5, },
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{ .reg_offset = 0, .mask = 1 << 6, },
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{ .reg_offset = 0, .mask = 1 << 7, },
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{ .reg_offset = 1, .mask = 1 << 0, },
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{ .reg_offset = 1, .mask = 1 << 1, },
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};
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static const struct regmap_irq_chip max8907_on_off_irq_chip = {
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.name = "max8907 on_off",
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.status_base = MAX8907_REG_ON_OFF_IRQ1,
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.mask_base = MAX8907_REG_ON_OFF_IRQ1_MASK,
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.irq_reg_stride = MAX8907_REG_ON_OFF_IRQ2 - MAX8907_REG_ON_OFF_IRQ1,
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.num_regs = 2,
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.irqs = max8907_on_off_irqs,
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.num_irqs = ARRAY_SIZE(max8907_on_off_irqs),
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};
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static const struct regmap_irq max8907_rtc_irqs[] = {
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{ .reg_offset = 0, .mask = 1 << 2, },
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{ .reg_offset = 0, .mask = 1 << 3, },
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};
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static const struct regmap_irq_chip max8907_rtc_irq_chip = {
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.name = "max8907 rtc",
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.status_base = MAX8907_REG_RTC_IRQ,
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.mask_base = MAX8907_REG_RTC_IRQ_MASK,
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.num_regs = 1,
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.irqs = max8907_rtc_irqs,
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.num_irqs = ARRAY_SIZE(max8907_rtc_irqs),
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};
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static struct max8907 *max8907_pm_off;
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static void max8907_power_off(void)
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{
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regmap_update_bits(max8907_pm_off->regmap_gen, MAX8907_REG_RESET_CNFG,
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MAX8907_MASK_POWER_OFF, MAX8907_MASK_POWER_OFF);
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}
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static int max8907_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct max8907 *max8907;
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int ret;
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struct max8907_platform_data *pdata = dev_get_platdata(&i2c->dev);
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bool pm_off = false;
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if (pdata)
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pm_off = pdata->pm_off;
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else if (i2c->dev.of_node)
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pm_off = of_property_read_bool(i2c->dev.of_node,
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"maxim,system-power-controller");
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max8907 = devm_kzalloc(&i2c->dev, sizeof(struct max8907), GFP_KERNEL);
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if (!max8907) {
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ret = -ENOMEM;
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goto err_alloc_drvdata;
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}
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max8907->dev = &i2c->dev;
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dev_set_drvdata(max8907->dev, max8907);
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max8907->i2c_gen = i2c;
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i2c_set_clientdata(i2c, max8907);
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max8907->regmap_gen = devm_regmap_init_i2c(i2c,
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&max8907_regmap_gen_config);
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if (IS_ERR(max8907->regmap_gen)) {
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ret = PTR_ERR(max8907->regmap_gen);
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dev_err(&i2c->dev, "gen regmap init failed: %d\n", ret);
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goto err_regmap_gen;
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}
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max8907->i2c_rtc = i2c_new_dummy(i2c->adapter, MAX8907_RTC_I2C_ADDR);
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if (!max8907->i2c_rtc) {
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ret = -ENOMEM;
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goto err_dummy_rtc;
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}
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i2c_set_clientdata(max8907->i2c_rtc, max8907);
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max8907->regmap_rtc = devm_regmap_init_i2c(max8907->i2c_rtc,
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&max8907_regmap_rtc_config);
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if (IS_ERR(max8907->regmap_rtc)) {
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ret = PTR_ERR(max8907->regmap_rtc);
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dev_err(&i2c->dev, "rtc regmap init failed: %d\n", ret);
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goto err_regmap_rtc;
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}
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irq_set_status_flags(max8907->i2c_gen->irq, IRQ_NOAUTOEN);
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ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
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IRQF_ONESHOT | IRQF_SHARED, -1,
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&max8907_chg_irq_chip,
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&max8907->irqc_chg);
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if (ret != 0) {
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dev_err(&i2c->dev, "failed to add chg irq chip: %d\n", ret);
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goto err_irqc_chg;
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}
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ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
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IRQF_ONESHOT | IRQF_SHARED, -1,
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&max8907_on_off_irq_chip,
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&max8907->irqc_on_off);
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if (ret != 0) {
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dev_err(&i2c->dev, "failed to add on off irq chip: %d\n", ret);
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goto err_irqc_on_off;
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}
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ret = regmap_add_irq_chip(max8907->regmap_rtc, max8907->i2c_gen->irq,
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IRQF_ONESHOT | IRQF_SHARED, -1,
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&max8907_rtc_irq_chip,
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&max8907->irqc_rtc);
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if (ret != 0) {
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dev_err(&i2c->dev, "failed to add rtc irq chip: %d\n", ret);
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goto err_irqc_rtc;
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}
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enable_irq(max8907->i2c_gen->irq);
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ret = mfd_add_devices(max8907->dev, -1, max8907_cells,
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ARRAY_SIZE(max8907_cells), NULL, 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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goto err_add_devices;
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}
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if (pm_off && !pm_power_off) {
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max8907_pm_off = max8907;
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pm_power_off = max8907_power_off;
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}
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return 0;
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err_add_devices:
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regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
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err_irqc_rtc:
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regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
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err_irqc_on_off:
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regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
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err_irqc_chg:
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err_regmap_rtc:
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i2c_unregister_device(max8907->i2c_rtc);
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err_dummy_rtc:
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err_regmap_gen:
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err_alloc_drvdata:
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return ret;
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}
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static int max8907_i2c_remove(struct i2c_client *i2c)
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{
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struct max8907 *max8907 = i2c_get_clientdata(i2c);
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mfd_remove_devices(max8907->dev);
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regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
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regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
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regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
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i2c_unregister_device(max8907->i2c_rtc);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id max8907_of_match[] = {
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{ .compatible = "maxim,max8907" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, max8907_of_match);
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#endif
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static const struct i2c_device_id max8907_i2c_id[] = {
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{"max8907", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, max8907_i2c_id);
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static struct i2c_driver max8907_i2c_driver = {
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.driver = {
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.name = "max8907",
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.of_match_table = of_match_ptr(max8907_of_match),
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},
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.probe = max8907_i2c_probe,
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.remove = max8907_i2c_remove,
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.id_table = max8907_i2c_id,
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};
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static int __init max8907_i2c_init(void)
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{
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int ret = -ENODEV;
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ret = i2c_add_driver(&max8907_i2c_driver);
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if (ret != 0)
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pr_err("Failed to register I2C driver: %d\n", ret);
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return ret;
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}
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subsys_initcall(max8907_i2c_init);
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static void __exit max8907_i2c_exit(void)
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{
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i2c_del_driver(&max8907_i2c_driver);
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}
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module_exit(max8907_i2c_exit);
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MODULE_DESCRIPTION("MAX8907 multi-function core driver");
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MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
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MODULE_LICENSE("GPL v2");
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