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eccb80cc22
This patch continues the preparation for adding support for MAX77836 device to existing max14577 driver. Add enum for types of devices supported by this driver. The device type will be detected by matching of_device_id, or i2c_device_id as a fallback. The patch also moves to separate function the code related to displaying DeviceID register values. Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
279 lines
7.2 KiB
C
279 lines
7.2 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/of_device.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 struct of_device_id max14577_dt_match[] = {
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{
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.compatible = "maxim,max14577",
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.data = (void *)MAXIM_DEVICE_TYPE_MAX14577,
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},
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{},
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};
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static bool max14577_muic_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_muic_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.volatile_reg = max14577_muic_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 void max14577_print_dev_type(struct max14577 *max14577)
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{
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u8 reg_data, vendor_id, device_id;
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int ret;
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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,
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"Failed to read DEVICEID register: %d\n", ret);
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return;
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}
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vendor_id = ((reg_data & DEVID_VENDORID_MASK) >>
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DEVID_VENDORID_SHIFT);
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device_id = ((reg_data & DEVID_DEVICEID_MASK) >>
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DEVID_DEVICEID_SHIFT);
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dev_info(max14577->dev, "Device type: %u (ID: 0x%x, vendor: 0x%x)\n",
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max14577->dev_type, device_id, vendor_id);
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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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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,
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&max14577_muic_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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if (np) {
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const struct of_device_id *of_id;
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of_id = of_match_device(max14577_dt_match, &i2c->dev);
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if (of_id)
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max14577->dev_type = (unsigned int)of_id->data;
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} else {
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max14577->dev_type = id->driver_data;
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}
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max14577_print_dev_type(max14577);
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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", MAXIM_DEVICE_TYPE_MAX14577, },
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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 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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BUILD_BUG_ON(ARRAY_SIZE(max14577_i2c_id) != MAXIM_DEVICE_TYPE_NUM);
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BUILD_BUG_ON(ARRAY_SIZE(max14577_dt_match) != MAXIM_DEVICE_TYPE_NUM);
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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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