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2042f3c29f
if 'max8998_i2c_parse_dt_pdata() fails (when out of memory), a NULL
pointer dereference will occur in the error handling code.
Return directly instead.
Fixes: ee999fb3f17f("mfd: max8998: Add support for Device Tree")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
377 lines
9.6 KiB
C
377 lines
9.6 KiB
C
/*
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* max8998.c - mfd core driver for the Maxim 8998
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*
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* Copyright (C) 2009-2010 Samsung Electronics
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* Kyungmin Park <kyungmin.park@samsung.com>
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* Marek Szyprowski <m.szyprowski@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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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/pm_runtime.h>
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#include <linux/mutex.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/max8998.h>
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#include <linux/mfd/max8998-private.h>
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#define RTC_I2C_ADDR (0x0c >> 1)
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static const struct mfd_cell max8998_devs[] = {
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{
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.name = "max8998-pmic",
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}, {
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.name = "max8998-rtc",
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}, {
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.name = "max8998-battery",
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},
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};
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static const struct mfd_cell lp3974_devs[] = {
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{
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.name = "lp3974-pmic",
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}, {
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.name = "lp3974-rtc",
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},
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};
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int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
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{
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struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
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int ret;
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mutex_lock(&max8998->iolock);
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ret = i2c_smbus_read_byte_data(i2c, reg);
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mutex_unlock(&max8998->iolock);
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if (ret < 0)
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return ret;
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ret &= 0xff;
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*dest = ret;
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return 0;
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}
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EXPORT_SYMBOL(max8998_read_reg);
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int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
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{
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struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
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int ret;
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mutex_lock(&max8998->iolock);
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ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
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mutex_unlock(&max8998->iolock);
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if (ret < 0)
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return ret;
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return 0;
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}
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EXPORT_SYMBOL(max8998_bulk_read);
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int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
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{
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struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
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int ret;
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mutex_lock(&max8998->iolock);
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ret = i2c_smbus_write_byte_data(i2c, reg, value);
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mutex_unlock(&max8998->iolock);
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return ret;
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}
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EXPORT_SYMBOL(max8998_write_reg);
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int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
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{
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struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
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int ret;
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mutex_lock(&max8998->iolock);
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ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
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mutex_unlock(&max8998->iolock);
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if (ret < 0)
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return ret;
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return 0;
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}
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EXPORT_SYMBOL(max8998_bulk_write);
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int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
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{
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struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
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int ret;
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mutex_lock(&max8998->iolock);
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ret = i2c_smbus_read_byte_data(i2c, reg);
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if (ret >= 0) {
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u8 old_val = ret & 0xff;
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u8 new_val = (val & mask) | (old_val & (~mask));
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ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
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}
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mutex_unlock(&max8998->iolock);
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return ret;
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}
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EXPORT_SYMBOL(max8998_update_reg);
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#ifdef CONFIG_OF
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static const struct of_device_id max8998_dt_match[] = {
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{ .compatible = "maxim,max8998", .data = (void *)TYPE_MAX8998 },
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{ .compatible = "national,lp3974", .data = (void *)TYPE_LP3974 },
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{ .compatible = "ti,lp3974", .data = (void *)TYPE_LP3974 },
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{},
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};
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#endif
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/*
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* Only the common platform data elements for max8998 are parsed here from the
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* device tree. Other sub-modules of max8998 such as pmic, rtc and others have
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* to parse their own platform data elements from device tree.
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*
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* The max8998 platform data structure is instantiated here and the drivers for
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* the sub-modules need not instantiate another instance while parsing their
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* platform data.
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*/
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static struct max8998_platform_data *max8998_i2c_parse_dt_pdata(
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struct device *dev)
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{
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struct max8998_platform_data *pd;
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pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
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if (!pd)
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return ERR_PTR(-ENOMEM);
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pd->ono = irq_of_parse_and_map(dev->of_node, 1);
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/*
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* ToDo: the 'wakeup' member in the platform data is more of a linux
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* specfic information. Hence, there is no binding for that yet and
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* not parsed here.
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*/
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return pd;
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}
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static inline unsigned long max8998_i2c_get_driver_data(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
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const struct of_device_id *match;
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match = of_match_node(max8998_dt_match, i2c->dev.of_node);
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return (unsigned long)match->data;
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}
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return id->driver_data;
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}
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static int max8998_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 max8998_platform_data *pdata = dev_get_platdata(&i2c->dev);
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struct max8998_dev *max8998;
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int ret = 0;
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max8998 = devm_kzalloc(&i2c->dev, sizeof(struct max8998_dev),
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GFP_KERNEL);
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if (max8998 == NULL)
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return -ENOMEM;
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if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
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pdata = max8998_i2c_parse_dt_pdata(&i2c->dev);
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if (IS_ERR(pdata))
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return PTR_ERR(pdata);
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}
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i2c_set_clientdata(i2c, max8998);
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max8998->dev = &i2c->dev;
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max8998->i2c = i2c;
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max8998->irq = i2c->irq;
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max8998->type = max8998_i2c_get_driver_data(i2c, id);
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max8998->pdata = pdata;
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if (pdata) {
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max8998->ono = pdata->ono;
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max8998->irq_base = pdata->irq_base;
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max8998->wakeup = pdata->wakeup;
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}
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mutex_init(&max8998->iolock);
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max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
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if (!max8998->rtc) {
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dev_err(&i2c->dev, "Failed to allocate I2C device for RTC\n");
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return -ENODEV;
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}
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i2c_set_clientdata(max8998->rtc, max8998);
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max8998_irq_init(max8998);
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pm_runtime_set_active(max8998->dev);
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switch (max8998->type) {
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case TYPE_LP3974:
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ret = mfd_add_devices(max8998->dev, -1,
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lp3974_devs, ARRAY_SIZE(lp3974_devs),
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NULL, 0, NULL);
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break;
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case TYPE_MAX8998:
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ret = mfd_add_devices(max8998->dev, -1,
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max8998_devs, ARRAY_SIZE(max8998_devs),
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NULL, 0, NULL);
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break;
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default:
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ret = -EINVAL;
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}
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if (ret < 0)
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goto err;
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device_init_wakeup(max8998->dev, max8998->wakeup);
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return ret;
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err:
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mfd_remove_devices(max8998->dev);
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max8998_irq_exit(max8998);
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i2c_unregister_device(max8998->rtc);
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return ret;
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}
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static const struct i2c_device_id max8998_i2c_id[] = {
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{ "max8998", TYPE_MAX8998 },
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{ "lp3974", TYPE_LP3974},
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{ }
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};
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static int max8998_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 max8998_dev *max8998 = i2c_get_clientdata(i2c);
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if (device_may_wakeup(dev))
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irq_set_irq_wake(max8998->irq, 1);
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return 0;
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}
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static int max8998_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 max8998_dev *max8998 = i2c_get_clientdata(i2c);
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if (device_may_wakeup(dev))
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irq_set_irq_wake(max8998->irq, 0);
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/*
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* In LP3974, if IRQ registers are not "read & clear"
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* when it's set during sleep, the interrupt becomes
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* disabled.
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*/
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return max8998_irq_resume(i2c_get_clientdata(i2c));
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}
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struct max8998_reg_dump {
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u8 addr;
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u8 val;
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};
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#define SAVE_ITEM(x) { .addr = (x), .val = 0x0, }
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static struct max8998_reg_dump max8998_dump[] = {
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SAVE_ITEM(MAX8998_REG_IRQM1),
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SAVE_ITEM(MAX8998_REG_IRQM2),
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SAVE_ITEM(MAX8998_REG_IRQM3),
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SAVE_ITEM(MAX8998_REG_IRQM4),
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SAVE_ITEM(MAX8998_REG_STATUSM1),
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SAVE_ITEM(MAX8998_REG_STATUSM2),
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SAVE_ITEM(MAX8998_REG_CHGR1),
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SAVE_ITEM(MAX8998_REG_CHGR2),
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SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
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SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
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SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
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SAVE_ITEM(MAX8998_REG_ONOFF1),
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SAVE_ITEM(MAX8998_REG_ONOFF2),
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SAVE_ITEM(MAX8998_REG_ONOFF3),
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SAVE_ITEM(MAX8998_REG_ONOFF4),
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SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
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SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
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SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
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SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
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SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
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SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
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SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
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SAVE_ITEM(MAX8998_REG_LDO4),
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SAVE_ITEM(MAX8998_REG_LDO5),
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SAVE_ITEM(MAX8998_REG_LDO6),
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SAVE_ITEM(MAX8998_REG_LDO7),
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SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
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SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
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SAVE_ITEM(MAX8998_REG_LDO12),
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SAVE_ITEM(MAX8998_REG_LDO13),
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SAVE_ITEM(MAX8998_REG_LDO14),
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SAVE_ITEM(MAX8998_REG_LDO15),
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SAVE_ITEM(MAX8998_REG_LDO16),
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SAVE_ITEM(MAX8998_REG_LDO17),
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SAVE_ITEM(MAX8998_REG_BKCHR),
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SAVE_ITEM(MAX8998_REG_LBCNFG1),
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SAVE_ITEM(MAX8998_REG_LBCNFG2),
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};
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/* Save registers before hibernation */
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static int max8998_freeze(struct device *dev)
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{
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struct i2c_client *i2c = to_i2c_client(dev);
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int i;
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for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
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max8998_read_reg(i2c, max8998_dump[i].addr,
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&max8998_dump[i].val);
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return 0;
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}
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/* Restore registers after hibernation */
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static int max8998_restore(struct device *dev)
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{
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struct i2c_client *i2c = to_i2c_client(dev);
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int i;
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for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
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max8998_write_reg(i2c, max8998_dump[i].addr,
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max8998_dump[i].val);
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return 0;
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}
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static const struct dev_pm_ops max8998_pm = {
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.suspend = max8998_suspend,
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.resume = max8998_resume,
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.freeze = max8998_freeze,
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.restore = max8998_restore,
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};
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static struct i2c_driver max8998_i2c_driver = {
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.driver = {
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.name = "max8998",
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.pm = &max8998_pm,
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.suppress_bind_attrs = true,
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.of_match_table = of_match_ptr(max8998_dt_match),
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},
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.probe = max8998_i2c_probe,
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.id_table = max8998_i2c_id,
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};
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static int __init max8998_i2c_init(void)
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{
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return i2c_add_driver(&max8998_i2c_driver);
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}
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/* init early so consumer devices can complete system boot */
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subsys_initcall(max8998_i2c_init);
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