314 lines
8.6 KiB
C
314 lines
8.6 KiB
C
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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 <woong.byun@samsung.com>
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* Jonghwa Lee <jonghwa3.lee@samsung.com>
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* This driver is based on max8997.c
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*/
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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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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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const struct i2c_device_id *id)
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{
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struct max77686_dev *max77686 = NULL;
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const struct of_device_id *match;
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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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if (i2c->dev.of_node) {
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match = of_match_node(max77686_pmic_dt_match, i2c->dev.of_node);
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if (!match)
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return -EINVAL;
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max77686->type = (unsigned long)match->data;
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} else
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max77686->type = id->driver_data;
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i2c_set_clientdata(i2c, max77686);
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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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static const struct i2c_device_id max77686_i2c_id[] = {
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{ "max77686", TYPE_MAX77686 },
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{ "max77802", TYPE_MAX77802 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
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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 = of_match_ptr(max77686_pmic_dt_match),
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},
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.probe = max77686_i2c_probe,
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.id_table = max77686_i2c_id,
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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 <woong.byun@samsung.com>");
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MODULE_LICENSE("GPL");
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