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linux-next/drivers/input/misc/max8997_haptic.c
Marek Szyprowski 6ae645d5fa Input: max8997-haptic - fix NULL pointer dereference 
NULL pointer derefence happens when booting with DTB because the
platform data for haptic device is not set in supplied data from parent
MFD device.

The MFD device creates only platform data (from Device Tree) for itself,
not for haptic child.

Unable to handle kernel NULL pointer dereference at virtual address 0000009c
pgd = c0004000
	[0000009c] *pgd=00000000
	Internal error: Oops: 5 [#1] PREEMPT SMP ARM
	(max8997_haptic_probe) from [<c03f9cec>] (platform_drv_probe+0x4c/0xb0)
	(platform_drv_probe) from [<c03f8440>] (driver_probe_device+0x214/0x2c0)
	(driver_probe_device) from [<c03f8598>] (__driver_attach+0xac/0xb0)
	(__driver_attach) from [<c03f67ac>] (bus_for_each_dev+0x68/0x9c)
	(bus_for_each_dev) from [<c03f7a38>] (bus_add_driver+0x1a0/0x218)
	(bus_add_driver) from [<c03f8db0>] (driver_register+0x78/0xf8)
	(driver_register) from [<c0101774>] (do_one_initcall+0x90/0x1d8)
	(do_one_initcall) from [<c0a00dbc>] (kernel_init_freeable+0x15c/0x1fc)
	(kernel_init_freeable) from [<c06bb5b4>] (kernel_init+0x8/0x114)
	(kernel_init) from [<c0107938>] (ret_from_fork+0x14/0x3c)

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: <stable@vger.kernel.org>
Fixes: 104594b01c ("Input: add driver support for MAX8997-haptic")
[k.kozlowski: Write commit message, add CC-stable]
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2016-05-09 09:33:33 -07:00

415 lines
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/*
* MAX8997-haptic controller driver
*
* Copyright (C) 2012 Samsung Electronics
* Donggeun Kim <dg77.kim@samsung.com>
*
* This program is not provided / owned by Maxim Integrated Products.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/pwm.h>
#include <linux/input.h>
#include <linux/mfd/max8997-private.h>
#include <linux/mfd/max8997.h>
#include <linux/regulator/consumer.h>
/* Haptic configuration 2 register */
#define MAX8997_MOTOR_TYPE_SHIFT 7
#define MAX8997_ENABLE_SHIFT 6
#define MAX8997_MODE_SHIFT 5
/* Haptic driver configuration register */
#define MAX8997_CYCLE_SHIFT 6
#define MAX8997_SIG_PERIOD_SHIFT 4
#define MAX8997_SIG_DUTY_SHIFT 2
#define MAX8997_PWM_DUTY_SHIFT 0
struct max8997_haptic {
struct device *dev;
struct i2c_client *client;
struct input_dev *input_dev;
struct regulator *regulator;
struct work_struct work;
struct mutex mutex;
bool enabled;
unsigned int level;
struct pwm_device *pwm;
unsigned int pwm_period;
enum max8997_haptic_pwm_divisor pwm_divisor;
enum max8997_haptic_motor_type type;
enum max8997_haptic_pulse_mode mode;
unsigned int internal_mode_pattern;
unsigned int pattern_cycle;
unsigned int pattern_signal_period;
};
static int max8997_haptic_set_duty_cycle(struct max8997_haptic *chip)
{
int ret = 0;
if (chip->mode == MAX8997_EXTERNAL_MODE) {
unsigned int duty = chip->pwm_period * chip->level / 100;
ret = pwm_config(chip->pwm, duty, chip->pwm_period);
} else {
int i;
u8 duty_index = 0;
for (i = 0; i <= 64; i++) {
if (chip->level <= i * 100 / 64) {
duty_index = i;
break;
}
}
switch (chip->internal_mode_pattern) {
case 0:
max8997_write_reg(chip->client,
MAX8997_HAPTIC_REG_SIGPWMDC1, duty_index);
break;
case 1:
max8997_write_reg(chip->client,
MAX8997_HAPTIC_REG_SIGPWMDC2, duty_index);
break;
case 2:
max8997_write_reg(chip->client,
MAX8997_HAPTIC_REG_SIGPWMDC3, duty_index);
break;
case 3:
max8997_write_reg(chip->client,
MAX8997_HAPTIC_REG_SIGPWMDC4, duty_index);
break;
default:
break;
}
}
return ret;
}
static void max8997_haptic_configure(struct max8997_haptic *chip)
{
u8 value;
value = chip->type << MAX8997_MOTOR_TYPE_SHIFT |
chip->enabled << MAX8997_ENABLE_SHIFT |
chip->mode << MAX8997_MODE_SHIFT | chip->pwm_divisor;
max8997_write_reg(chip->client, MAX8997_HAPTIC_REG_CONF2, value);
if (chip->mode == MAX8997_INTERNAL_MODE && chip->enabled) {
value = chip->internal_mode_pattern << MAX8997_CYCLE_SHIFT |
chip->internal_mode_pattern << MAX8997_SIG_PERIOD_SHIFT |
chip->internal_mode_pattern << MAX8997_SIG_DUTY_SHIFT |
chip->internal_mode_pattern << MAX8997_PWM_DUTY_SHIFT;
max8997_write_reg(chip->client,
MAX8997_HAPTIC_REG_DRVCONF, value);
switch (chip->internal_mode_pattern) {
case 0:
value = chip->pattern_cycle << 4;
max8997_write_reg(chip->client,
MAX8997_HAPTIC_REG_CYCLECONF1, value);
value = chip->pattern_signal_period;
max8997_write_reg(chip->client,
MAX8997_HAPTIC_REG_SIGCONF1, value);
break;
case 1:
value = chip->pattern_cycle;
max8997_write_reg(chip->client,
MAX8997_HAPTIC_REG_CYCLECONF1, value);
value = chip->pattern_signal_period;
max8997_write_reg(chip->client,
MAX8997_HAPTIC_REG_SIGCONF2, value);
break;
case 2:
value = chip->pattern_cycle << 4;
max8997_write_reg(chip->client,
MAX8997_HAPTIC_REG_CYCLECONF2, value);
value = chip->pattern_signal_period;
max8997_write_reg(chip->client,
MAX8997_HAPTIC_REG_SIGCONF3, value);
break;
case 3:
value = chip->pattern_cycle;
max8997_write_reg(chip->client,
MAX8997_HAPTIC_REG_CYCLECONF2, value);
value = chip->pattern_signal_period;
max8997_write_reg(chip->client,
MAX8997_HAPTIC_REG_SIGCONF4, value);
break;
default:
break;
}
}
}
static void max8997_haptic_enable(struct max8997_haptic *chip)
{
int error;
mutex_lock(&chip->mutex);
error = max8997_haptic_set_duty_cycle(chip);
if (error) {
dev_err(chip->dev, "set_pwm_cycle failed, error: %d\n", error);
goto out;
}
if (!chip->enabled) {
error = regulator_enable(chip->regulator);
if (error) {
dev_err(chip->dev, "Failed to enable regulator\n");
goto out;
}
max8997_haptic_configure(chip);
if (chip->mode == MAX8997_EXTERNAL_MODE) {
error = pwm_enable(chip->pwm);
if (error) {
dev_err(chip->dev, "Failed to enable PWM\n");
regulator_disable(chip->regulator);
goto out;
}
}
chip->enabled = true;
}
out:
mutex_unlock(&chip->mutex);
}
static void max8997_haptic_disable(struct max8997_haptic *chip)
{
mutex_lock(&chip->mutex);
if (chip->enabled) {
chip->enabled = false;
max8997_haptic_configure(chip);
if (chip->mode == MAX8997_EXTERNAL_MODE)
pwm_disable(chip->pwm);
regulator_disable(chip->regulator);
}
mutex_unlock(&chip->mutex);
}
static void max8997_haptic_play_effect_work(struct work_struct *work)
{
struct max8997_haptic *chip =
container_of(work, struct max8997_haptic, work);
if (chip->level)
max8997_haptic_enable(chip);
else
max8997_haptic_disable(chip);
}
static int max8997_haptic_play_effect(struct input_dev *dev, void *data,
struct ff_effect *effect)
{
struct max8997_haptic *chip = input_get_drvdata(dev);
chip->level = effect->u.rumble.strong_magnitude;
if (!chip->level)
chip->level = effect->u.rumble.weak_magnitude;
schedule_work(&chip->work);
return 0;
}
static void max8997_haptic_close(struct input_dev *dev)
{
struct max8997_haptic *chip = input_get_drvdata(dev);
cancel_work_sync(&chip->work);
max8997_haptic_disable(chip);
}
static int max8997_haptic_probe(struct platform_device *pdev)
{
struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
const struct max8997_platform_data *pdata =
dev_get_platdata(iodev->dev);
const struct max8997_haptic_platform_data *haptic_pdata = NULL;
struct max8997_haptic *chip;
struct input_dev *input_dev;
int error;
if (pdata)
haptic_pdata = pdata->haptic_pdata;
if (!haptic_pdata) {
dev_err(&pdev->dev, "no haptic platform data\n");
return -EINVAL;
}
chip = kzalloc(sizeof(struct max8997_haptic), GFP_KERNEL);
input_dev = input_allocate_device();
if (!chip || !input_dev) {
dev_err(&pdev->dev, "unable to allocate memory\n");
error = -ENOMEM;
goto err_free_mem;
}
INIT_WORK(&chip->work, max8997_haptic_play_effect_work);
mutex_init(&chip->mutex);
chip->client = iodev->haptic;
chip->dev = &pdev->dev;
chip->input_dev = input_dev;
chip->pwm_period = haptic_pdata->pwm_period;
chip->type = haptic_pdata->type;
chip->mode = haptic_pdata->mode;
chip->pwm_divisor = haptic_pdata->pwm_divisor;
switch (chip->mode) {
case MAX8997_INTERNAL_MODE:
chip->internal_mode_pattern =
haptic_pdata->internal_mode_pattern;
chip->pattern_cycle = haptic_pdata->pattern_cycle;
chip->pattern_signal_period =
haptic_pdata->pattern_signal_period;
break;
case MAX8997_EXTERNAL_MODE:
chip->pwm = pwm_request(haptic_pdata->pwm_channel_id,
"max8997-haptic");
if (IS_ERR(chip->pwm)) {
error = PTR_ERR(chip->pwm);
dev_err(&pdev->dev,
"unable to request PWM for haptic, error: %d\n",
error);
goto err_free_mem;
}
break;
default:
dev_err(&pdev->dev,
"Invalid chip mode specified (%d)\n", chip->mode);
error = -EINVAL;
goto err_free_mem;
}
chip->regulator = regulator_get(&pdev->dev, "inmotor");
if (IS_ERR(chip->regulator)) {
error = PTR_ERR(chip->regulator);
dev_err(&pdev->dev,
"unable to get regulator, error: %d\n",
error);
goto err_free_pwm;
}
input_dev->name = "max8997-haptic";
input_dev->id.version = 1;
input_dev->dev.parent = &pdev->dev;
input_dev->close = max8997_haptic_close;
input_set_drvdata(input_dev, chip);
input_set_capability(input_dev, EV_FF, FF_RUMBLE);
error = input_ff_create_memless(input_dev, NULL,
max8997_haptic_play_effect);
if (error) {
dev_err(&pdev->dev,
"unable to create FF device, error: %d\n",
error);
goto err_put_regulator;
}
error = input_register_device(input_dev);
if (error) {
dev_err(&pdev->dev,
"unable to register input device, error: %d\n",
error);
goto err_destroy_ff;
}
platform_set_drvdata(pdev, chip);
return 0;
err_destroy_ff:
input_ff_destroy(input_dev);
err_put_regulator:
regulator_put(chip->regulator);
err_free_pwm:
if (chip->mode == MAX8997_EXTERNAL_MODE)
pwm_free(chip->pwm);
err_free_mem:
input_free_device(input_dev);
kfree(chip);
return error;
}
static int max8997_haptic_remove(struct platform_device *pdev)
{
struct max8997_haptic *chip = platform_get_drvdata(pdev);
input_unregister_device(chip->input_dev);
regulator_put(chip->regulator);
if (chip->mode == MAX8997_EXTERNAL_MODE)
pwm_free(chip->pwm);
kfree(chip);
return 0;
}
static int __maybe_unused max8997_haptic_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct max8997_haptic *chip = platform_get_drvdata(pdev);
max8997_haptic_disable(chip);
return 0;
}
static SIMPLE_DEV_PM_OPS(max8997_haptic_pm_ops, max8997_haptic_suspend, NULL);
static const struct platform_device_id max8997_haptic_id[] = {
{ "max8997-haptic", 0 },
{ },
};
MODULE_DEVICE_TABLE(platform, max8997_haptic_id);
static struct platform_driver max8997_haptic_driver = {
.driver = {
.name = "max8997-haptic",
.pm = &max8997_haptic_pm_ops,
},
.probe = max8997_haptic_probe,
.remove = max8997_haptic_remove,
.id_table = max8997_haptic_id,
};
module_platform_driver(max8997_haptic_driver);
MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
MODULE_DESCRIPTION("max8997_haptic driver");
MODULE_LICENSE("GPL");
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