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800e54558b
Add NULL check before dereferencing pointer of_id in order to avoid a potential NULL pointer dereference. Addresses-Coverity-ID: 1408829 Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
140 lines
3.2 KiB
C
140 lines
3.2 KiB
C
/*
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* wm831x-i2c.c -- I2C access for Wolfson WM831x PMICs
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*
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* Copyright 2009,2010 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/delay.h>
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#include <linux/mfd/core.h>
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#include <linux/slab.h>
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#include <linux/err.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/mfd/wm831x/core.h>
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#include <linux/mfd/wm831x/pdata.h>
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static int wm831x_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 wm831x_pdata *pdata = dev_get_platdata(&i2c->dev);
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const struct of_device_id *of_id;
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struct wm831x *wm831x;
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enum wm831x_parent type;
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int ret;
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if (i2c->dev.of_node) {
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of_id = of_match_device(wm831x_of_match, &i2c->dev);
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if (!of_id) {
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dev_err(&i2c->dev, "Failed to match device\n");
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return -ENODEV;
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}
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type = (enum wm831x_parent)of_id->data;
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} else {
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type = (enum wm831x_parent)id->driver_data;
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}
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wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL);
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if (wm831x == NULL)
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return -ENOMEM;
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i2c_set_clientdata(i2c, wm831x);
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wm831x->dev = &i2c->dev;
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wm831x->type = type;
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wm831x->regmap = devm_regmap_init_i2c(i2c, &wm831x_regmap_config);
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if (IS_ERR(wm831x->regmap)) {
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ret = PTR_ERR(wm831x->regmap);
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dev_err(wm831x->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 (pdata)
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memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
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return wm831x_device_init(wm831x, i2c->irq);
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}
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static int wm831x_i2c_remove(struct i2c_client *i2c)
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{
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struct wm831x *wm831x = i2c_get_clientdata(i2c);
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wm831x_device_exit(wm831x);
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return 0;
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}
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static int wm831x_i2c_suspend(struct device *dev)
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{
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struct wm831x *wm831x = dev_get_drvdata(dev);
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return wm831x_device_suspend(wm831x);
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}
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static int wm831x_i2c_poweroff(struct device *dev)
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{
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struct wm831x *wm831x = dev_get_drvdata(dev);
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wm831x_device_shutdown(wm831x);
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return 0;
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}
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static const struct i2c_device_id wm831x_i2c_id[] = {
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{ "wm8310", WM8310 },
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{ "wm8311", WM8311 },
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{ "wm8312", WM8312 },
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{ "wm8320", WM8320 },
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{ "wm8321", WM8321 },
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{ "wm8325", WM8325 },
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{ "wm8326", WM8326 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, wm831x_i2c_id);
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static const struct dev_pm_ops wm831x_pm_ops = {
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.suspend = wm831x_i2c_suspend,
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.poweroff = wm831x_i2c_poweroff,
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};
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static struct i2c_driver wm831x_i2c_driver = {
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.driver = {
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.name = "wm831x",
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.pm = &wm831x_pm_ops,
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.of_match_table = of_match_ptr(wm831x_of_match),
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},
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.probe = wm831x_i2c_probe,
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.remove = wm831x_i2c_remove,
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.id_table = wm831x_i2c_id,
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};
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static int __init wm831x_i2c_init(void)
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{
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int ret;
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ret = i2c_add_driver(&wm831x_i2c_driver);
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if (ret != 0)
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pr_err("Failed to register wm831x I2C driver: %d\n", ret);
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return ret;
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}
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subsys_initcall(wm831x_i2c_init);
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static void __exit wm831x_i2c_exit(void)
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{
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i2c_del_driver(&wm831x_i2c_driver);
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}
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module_exit(wm831x_i2c_exit);
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