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c8016d45a3
Add this header explicitly for IS_ERR and friends. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
252 lines
6.6 KiB
C
252 lines
6.6 KiB
C
/*
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* max14577.c - mfd core driver for the Maxim 14577
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*
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* Copyright (C) 2013 Samsung Electrnoics
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* Chanwoo Choi <cw00.choi@samsung.com>
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* Krzysztof Kozlowski <k.kozlowski@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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* This driver is based on max8997.c
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*/
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/max14577.h>
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#include <linux/mfd/max14577-private.h>
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static struct mfd_cell max14577_devs[] = {
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{
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.name = "max14577-muic",
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.of_compatible = "maxim,max14577-muic",
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},
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{
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.name = "max14577-regulator",
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.of_compatible = "maxim,max14577-regulator",
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},
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{ .name = "max14577-charger", },
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};
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static bool max14577_volatile_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case MAX14577_REG_INT1 ... MAX14577_REG_STATUS3:
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return true;
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default:
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break;
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}
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return false;
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}
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static const struct regmap_config max14577_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.volatile_reg = max14577_volatile_reg,
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.max_register = MAX14577_REG_END,
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};
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static const struct regmap_irq max14577_irqs[] = {
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/* INT1 interrupts */
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{ .reg_offset = 0, .mask = INT1_ADC_MASK, },
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{ .reg_offset = 0, .mask = INT1_ADCLOW_MASK, },
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{ .reg_offset = 0, .mask = INT1_ADCERR_MASK, },
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/* INT2 interrupts */
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{ .reg_offset = 1, .mask = INT2_CHGTYP_MASK, },
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{ .reg_offset = 1, .mask = INT2_CHGDETRUN_MASK, },
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{ .reg_offset = 1, .mask = INT2_DCDTMR_MASK, },
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{ .reg_offset = 1, .mask = INT2_DBCHG_MASK, },
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{ .reg_offset = 1, .mask = INT2_VBVOLT_MASK, },
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/* INT3 interrupts */
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{ .reg_offset = 2, .mask = INT3_EOC_MASK, },
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{ .reg_offset = 2, .mask = INT3_CGMBC_MASK, },
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{ .reg_offset = 2, .mask = INT3_OVP_MASK, },
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{ .reg_offset = 2, .mask = INT3_MBCCHGERR_MASK, },
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};
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static const struct regmap_irq_chip max14577_irq_chip = {
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.name = "max14577",
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.status_base = MAX14577_REG_INT1,
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.mask_base = MAX14577_REG_INTMASK1,
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.mask_invert = 1,
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.num_regs = 3,
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.irqs = max14577_irqs,
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.num_irqs = ARRAY_SIZE(max14577_irqs),
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};
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static int max14577_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 max14577 *max14577;
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struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev);
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struct device_node *np = i2c->dev.of_node;
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u8 reg_data;
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int ret = 0;
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if (np) {
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pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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i2c->dev.platform_data = pdata;
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}
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if (!pdata) {
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dev_err(&i2c->dev, "No platform data found.\n");
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return -EINVAL;
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}
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max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL);
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if (!max14577)
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return -ENOMEM;
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i2c_set_clientdata(i2c, max14577);
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max14577->dev = &i2c->dev;
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max14577->i2c = i2c;
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max14577->irq = i2c->irq;
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max14577->regmap = devm_regmap_init_i2c(i2c, &max14577_regmap_config);
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if (IS_ERR(max14577->regmap)) {
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ret = PTR_ERR(max14577->regmap);
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dev_err(max14577->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 = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID,
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®_data);
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if (ret) {
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dev_err(max14577->dev, "Device not found on this channel: %d\n",
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ret);
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return ret;
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}
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max14577->vendor_id = ((reg_data & DEVID_VENDORID_MASK) >>
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DEVID_VENDORID_SHIFT);
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max14577->device_id = ((reg_data & DEVID_DEVICEID_MASK) >>
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DEVID_DEVICEID_SHIFT);
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dev_info(max14577->dev, "Device ID: 0x%x, vendor: 0x%x\n",
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max14577->device_id, max14577->vendor_id);
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ret = regmap_add_irq_chip(max14577->regmap, max14577->irq,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 0,
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&max14577_irq_chip,
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&max14577->irq_data);
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if (ret != 0) {
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dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
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max14577->irq, ret);
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return ret;
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}
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ret = mfd_add_devices(max14577->dev, -1, max14577_devs,
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ARRAY_SIZE(max14577_devs), NULL, 0,
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regmap_irq_get_domain(max14577->irq_data));
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if (ret < 0)
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goto err_mfd;
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device_init_wakeup(max14577->dev, 1);
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return 0;
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err_mfd:
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regmap_del_irq_chip(max14577->irq, max14577->irq_data);
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return ret;
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}
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static int max14577_i2c_remove(struct i2c_client *i2c)
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{
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struct max14577 *max14577 = i2c_get_clientdata(i2c);
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mfd_remove_devices(max14577->dev);
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regmap_del_irq_chip(max14577->irq, max14577->irq_data);
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return 0;
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}
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static const struct i2c_device_id max14577_i2c_id[] = {
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{ "max14577", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, max14577_i2c_id);
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#ifdef CONFIG_PM_SLEEP
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static int max14577_suspend(struct device *dev)
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{
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struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
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struct max14577 *max14577 = i2c_get_clientdata(i2c);
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if (device_may_wakeup(dev)) {
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enable_irq_wake(max14577->irq);
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/*
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* MUIC IRQ must be disabled during suspend if this is
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* a wake up source because it will be handled before
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* resuming I2C.
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*
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* When device is woken up from suspend (e.g. by ADC change),
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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(max14577->irq);
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}
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return 0;
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}
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static int max14577_resume(struct device *dev)
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{
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struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
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struct max14577 *max14577 = i2c_get_clientdata(i2c);
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if (device_may_wakeup(dev)) {
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disable_irq_wake(max14577->irq);
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enable_irq(max14577->irq);
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}
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return 0;
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}
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#endif /* CONFIG_PM_SLEEP */
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static struct of_device_id max14577_dt_match[] = {
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{ .compatible = "maxim,max14577", },
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{},
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};
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static SIMPLE_DEV_PM_OPS(max14577_pm, max14577_suspend, max14577_resume);
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static struct i2c_driver max14577_i2c_driver = {
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.driver = {
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.name = "max14577",
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.owner = THIS_MODULE,
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.pm = &max14577_pm,
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.of_match_table = max14577_dt_match,
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},
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.probe = max14577_i2c_probe,
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.remove = max14577_i2c_remove,
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.id_table = max14577_i2c_id,
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};
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static int __init max14577_i2c_init(void)
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{
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return i2c_add_driver(&max14577_i2c_driver);
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}
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subsys_initcall(max14577_i2c_init);
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static void __exit max14577_i2c_exit(void)
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{
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i2c_del_driver(&max14577_i2c_driver);
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}
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module_exit(max14577_i2c_exit);
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MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <k.kozlowski@samsung.com>");
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MODULE_DESCRIPTION("MAXIM 14577 multi-function core driver");
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MODULE_LICENSE("GPL");
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