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linux_dsm_epyc7002/drivers/leds/leds-lm3533.c
Johan Hovold d584221e68 leds: lm3533: fix use-after-free on unbind 
Several MFD child drivers register their class devices directly under
the parent device. This means you cannot blindly do devres conversions
so that deregistration ends up being tied to the parent device,
something which leads to use-after-free on driver unbind when the class
device is released while still being registered.

Fixes: 50154e29e5 ("leds: lm3533: Use devm_led_classdev_register")
Cc: stable <stable@vger.kernel.org>     # 4.6
Cc: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
2020-06-22 10:37:59 +02:00

758 lines
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* leds-lm3533.c -- LM3533 LED driver
*
* Copyright (C) 2011-2012 Texas Instruments
*
* Author: Johan Hovold <jhovold@gmail.com>
*/
#include <linux/module.h>
#include <linux/leds.h>
#include <linux/mfd/core.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/mfd/lm3533.h>
#define LM3533_LVCTRLBANK_MIN 2
#define LM3533_LVCTRLBANK_MAX 5
#define LM3533_LVCTRLBANK_COUNT 4
#define LM3533_RISEFALLTIME_MAX 7
#define LM3533_ALS_CHANNEL_LV_MIN 1
#define LM3533_ALS_CHANNEL_LV_MAX 2
#define LM3533_REG_CTRLBANK_BCONF_BASE 0x1b
#define LM3533_REG_PATTERN_ENABLE 0x28
#define LM3533_REG_PATTERN_LOW_TIME_BASE 0x71
#define LM3533_REG_PATTERN_HIGH_TIME_BASE 0x72
#define LM3533_REG_PATTERN_RISETIME_BASE 0x74
#define LM3533_REG_PATTERN_FALLTIME_BASE 0x75
#define LM3533_REG_PATTERN_STEP 0x10
#define LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK 0x04
#define LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK 0x02
#define LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK 0x01
#define LM3533_LED_FLAG_PATTERN_ENABLE 1
struct lm3533_led {
struct lm3533 *lm3533;
struct lm3533_ctrlbank cb;
struct led_classdev cdev;
int id;
struct mutex mutex;
unsigned long flags;
};
static inline struct lm3533_led *to_lm3533_led(struct led_classdev *cdev)
{
return container_of(cdev, struct lm3533_led, cdev);
}
static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led)
{
return led->id + 2;
}
static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base)
{
return base + led->id;
}
static inline u8 lm3533_led_get_pattern(struct lm3533_led *led)
{
return led->id;
}
static inline u8 lm3533_led_get_pattern_reg(struct lm3533_led *led,
u8 base)
{
return base + lm3533_led_get_pattern(led) * LM3533_REG_PATTERN_STEP;
}
static int lm3533_led_pattern_enable(struct lm3533_led *led, int enable)
{
u8 mask;
u8 val;
int pattern;
int state;
int ret = 0;
dev_dbg(led->cdev.dev, "%s - %d\n", __func__, enable);
mutex_lock(&led->mutex);
state = test_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
if ((enable && state) || (!enable && !state))
goto out;
pattern = lm3533_led_get_pattern(led);
mask = 1 << (2 * pattern);
if (enable)
val = mask;
else
val = 0;
ret = lm3533_update(led->lm3533, LM3533_REG_PATTERN_ENABLE, val, mask);
if (ret) {
dev_err(led->cdev.dev, "failed to enable pattern %d (%d)\n",
pattern, enable);
goto out;
}
__change_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
out:
mutex_unlock(&led->mutex);
return ret;
}
static int lm3533_led_set(struct led_classdev *cdev,
enum led_brightness value)
{
struct lm3533_led *led = to_lm3533_led(cdev);
dev_dbg(led->cdev.dev, "%s - %d\n", __func__, value);
if (value == 0)
lm3533_led_pattern_enable(led, 0); /* disable blink */
return lm3533_ctrlbank_set_brightness(&led->cb, value);
}
static enum led_brightness lm3533_led_get(struct led_classdev *cdev)
{
struct lm3533_led *led = to_lm3533_led(cdev);
u8 val;
int ret;
ret = lm3533_ctrlbank_get_brightness(&led->cb, &val);
if (ret)
return ret;
dev_dbg(led->cdev.dev, "%s - %u\n", __func__, val);
return val;
}
/* Pattern generator defines (delays in us). */
#define LM3533_LED_DELAY1_VMIN 0x00
#define LM3533_LED_DELAY2_VMIN 0x3d
#define LM3533_LED_DELAY3_VMIN 0x80
#define LM3533_LED_DELAY1_VMAX (LM3533_LED_DELAY2_VMIN - 1)
#define LM3533_LED_DELAY2_VMAX (LM3533_LED_DELAY3_VMIN - 1)
#define LM3533_LED_DELAY3_VMAX 0xff
#define LM3533_LED_DELAY1_TMIN 16384U
#define LM3533_LED_DELAY2_TMIN 1130496U
#define LM3533_LED_DELAY3_TMIN 10305536U
#define LM3533_LED_DELAY1_TMAX 999424U
#define LM3533_LED_DELAY2_TMAX 9781248U
#define LM3533_LED_DELAY3_TMAX 76890112U
/* t_step = (t_max - t_min) / (v_max - v_min) */
#define LM3533_LED_DELAY1_TSTEP 16384
#define LM3533_LED_DELAY2_TSTEP 131072
#define LM3533_LED_DELAY3_TSTEP 524288
/* Delay limits for hardware accelerated blinking (in ms). */
#define LM3533_LED_DELAY_ON_MAX \
((LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY2_TSTEP / 2) / 1000)
#define LM3533_LED_DELAY_OFF_MAX \
((LM3533_LED_DELAY3_TMAX + LM3533_LED_DELAY3_TSTEP / 2) / 1000)
/*
* Returns linear map of *t from [t_min,t_max] to [v_min,v_max] with a step
* size of t_step, where
*
* t_step = (t_max - t_min) / (v_max - v_min)
*
* and updates *t to reflect the mapped value.
*/
static u8 time_to_val(unsigned *t, unsigned t_min, unsigned t_step,
u8 v_min, u8 v_max)
{
unsigned val;
val = (*t + t_step / 2 - t_min) / t_step + v_min;
*t = t_step * (val - v_min) + t_min;
return (u8)val;
}
/*
* Returns time code corresponding to *delay (in ms) and updates *delay to
* reflect actual hardware delay.
*
* Hardware supports 256 discrete delay times, divided into three groups with
* the following ranges and step-sizes:
*
* [ 16, 999] [0x00, 0x3e] step 16 ms
* [ 1130, 9781] [0x3d, 0x7f] step 131 ms
* [10306, 76890] [0x80, 0xff] step 524 ms
*
* Note that delay group 3 is only available for delay_off.
*/
static u8 lm3533_led_get_hw_delay(unsigned *delay)
{
unsigned t;
u8 val;
t = *delay * 1000;
if (t >= (LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY3_TMIN) / 2) {
t = clamp(t, LM3533_LED_DELAY3_TMIN, LM3533_LED_DELAY3_TMAX);
val = time_to_val(&t, LM3533_LED_DELAY3_TMIN,
LM3533_LED_DELAY3_TSTEP,
LM3533_LED_DELAY3_VMIN,
LM3533_LED_DELAY3_VMAX);
} else if (t >= (LM3533_LED_DELAY1_TMAX + LM3533_LED_DELAY2_TMIN) / 2) {
t = clamp(t, LM3533_LED_DELAY2_TMIN, LM3533_LED_DELAY2_TMAX);
val = time_to_val(&t, LM3533_LED_DELAY2_TMIN,
LM3533_LED_DELAY2_TSTEP,
LM3533_LED_DELAY2_VMIN,
LM3533_LED_DELAY2_VMAX);
} else {
t = clamp(t, LM3533_LED_DELAY1_TMIN, LM3533_LED_DELAY1_TMAX);
val = time_to_val(&t, LM3533_LED_DELAY1_TMIN,
LM3533_LED_DELAY1_TSTEP,
LM3533_LED_DELAY1_VMIN,
LM3533_LED_DELAY1_VMAX);
}
*delay = (t + 500) / 1000;
return val;
}
/*
* Set delay register base to *delay (in ms) and update *delay to reflect
* actual hardware delay used.
*/
static u8 lm3533_led_delay_set(struct lm3533_led *led, u8 base,
unsigned long *delay)
{
unsigned t;
u8 val;
u8 reg;
int ret;
t = (unsigned)*delay;
/* Delay group 3 is only available for low time (delay off). */
if (base != LM3533_REG_PATTERN_LOW_TIME_BASE)
t = min(t, LM3533_LED_DELAY2_TMAX / 1000);
val = lm3533_led_get_hw_delay(&t);
dev_dbg(led->cdev.dev, "%s - %lu: %u (0x%02x)\n", __func__,
*delay, t, val);
reg = lm3533_led_get_pattern_reg(led, base);
ret = lm3533_write(led->lm3533, reg, val);
if (ret)
dev_err(led->cdev.dev, "failed to set delay (%02x)\n", reg);
*delay = t;
return ret;
}
static int lm3533_led_delay_on_set(struct lm3533_led *led, unsigned long *t)
{
return lm3533_led_delay_set(led, LM3533_REG_PATTERN_HIGH_TIME_BASE, t);
}
static int lm3533_led_delay_off_set(struct lm3533_led *led, unsigned long *t)
{
return lm3533_led_delay_set(led, LM3533_REG_PATTERN_LOW_TIME_BASE, t);
}
static int lm3533_led_blink_set(struct led_classdev *cdev,
unsigned long *delay_on,
unsigned long *delay_off)
{
struct lm3533_led *led = to_lm3533_led(cdev);
int ret;
dev_dbg(led->cdev.dev, "%s - on = %lu, off = %lu\n", __func__,
*delay_on, *delay_off);
if (*delay_on > LM3533_LED_DELAY_ON_MAX ||
*delay_off > LM3533_LED_DELAY_OFF_MAX)
return -EINVAL;
if (*delay_on == 0 && *delay_off == 0) {
*delay_on = 500;
*delay_off = 500;
}
ret = lm3533_led_delay_on_set(led, delay_on);
if (ret)
return ret;
ret = lm3533_led_delay_off_set(led, delay_off);
if (ret)
return ret;
return lm3533_led_pattern_enable(led, 1);
}
static ssize_t show_id(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lm3533_led *led = to_lm3533_led(led_cdev);
return scnprintf(buf, PAGE_SIZE, "%d\n", led->id);
}
/*
* Pattern generator rise/fall times:
*
* 0 - 2048 us (default)
* 1 - 262 ms
* 2 - 524 ms
* 3 - 1.049 s
* 4 - 2.097 s
* 5 - 4.194 s
* 6 - 8.389 s
* 7 - 16.78 s
*/
static ssize_t show_risefalltime(struct device *dev,
struct device_attribute *attr,
char *buf, u8 base)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lm3533_led *led = to_lm3533_led(led_cdev);
ssize_t ret;
u8 reg;
u8 val;
reg = lm3533_led_get_pattern_reg(led, base);
ret = lm3533_read(led->lm3533, reg, &val);
if (ret)
return ret;
return scnprintf(buf, PAGE_SIZE, "%x\n", val);
}
static ssize_t show_risetime(struct device *dev,
struct device_attribute *attr, char *buf)
{
return show_risefalltime(dev, attr, buf,
LM3533_REG_PATTERN_RISETIME_BASE);
}
static ssize_t show_falltime(struct device *dev,
struct device_attribute *attr, char *buf)
{
return show_risefalltime(dev, attr, buf,
LM3533_REG_PATTERN_FALLTIME_BASE);
}
static ssize_t store_risefalltime(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len, u8 base)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lm3533_led *led = to_lm3533_led(led_cdev);
u8 val;
u8 reg;
int ret;
if (kstrtou8(buf, 0, &val) || val > LM3533_RISEFALLTIME_MAX)
return -EINVAL;
reg = lm3533_led_get_pattern_reg(led, base);
ret = lm3533_write(led->lm3533, reg, val);
if (ret)
return ret;
return len;
}
static ssize_t store_risetime(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
return store_risefalltime(dev, attr, buf, len,
LM3533_REG_PATTERN_RISETIME_BASE);
}
static ssize_t store_falltime(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
return store_risefalltime(dev, attr, buf, len,
LM3533_REG_PATTERN_FALLTIME_BASE);
}
static ssize_t show_als_channel(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lm3533_led *led = to_lm3533_led(led_cdev);
unsigned channel;
u8 reg;
u8 val;
int ret;
reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
ret = lm3533_read(led->lm3533, reg, &val);
if (ret)
return ret;
channel = (val & LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK) + 1;
return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
}
static ssize_t store_als_channel(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lm3533_led *led = to_lm3533_led(led_cdev);
unsigned channel;
u8 reg;
u8 val;
u8 mask;
int ret;
if (kstrtouint(buf, 0, &channel))
return -EINVAL;
if (channel < LM3533_ALS_CHANNEL_LV_MIN ||
channel > LM3533_ALS_CHANNEL_LV_MAX)
return -EINVAL;
reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
mask = LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK;
val = channel - 1;
ret = lm3533_update(led->lm3533, reg, val, mask);
if (ret)
return ret;
return len;
}
static ssize_t show_als_en(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lm3533_led *led = to_lm3533_led(led_cdev);
bool enable;
u8 reg;
u8 val;
int ret;
reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
ret = lm3533_read(led->lm3533, reg, &val);
if (ret)
return ret;
enable = val & LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
return scnprintf(buf, PAGE_SIZE, "%d\n", enable);
}
static ssize_t store_als_en(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lm3533_led *led = to_lm3533_led(led_cdev);
unsigned enable;
u8 reg;
u8 mask;
u8 val;
int ret;
if (kstrtouint(buf, 0, &enable))
return -EINVAL;
reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
mask = LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
if (enable)
val = mask;
else
val = 0;
ret = lm3533_update(led->lm3533, reg, val, mask);
if (ret)
return ret;
return len;
}
static ssize_t show_linear(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lm3533_led *led = to_lm3533_led(led_cdev);
u8 reg;
u8 val;
int linear;
int ret;
reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
ret = lm3533_read(led->lm3533, reg, &val);
if (ret)
return ret;
if (val & LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK)
linear = 1;
else
linear = 0;
return scnprintf(buf, PAGE_SIZE, "%x\n", linear);
}
static ssize_t store_linear(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lm3533_led *led = to_lm3533_led(led_cdev);
unsigned long linear;
u8 reg;
u8 mask;
u8 val;
int ret;
if (kstrtoul(buf, 0, &linear))
return -EINVAL;
reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
mask = LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK;
if (linear)
val = mask;
else
val = 0;
ret = lm3533_update(led->lm3533, reg, val, mask);
if (ret)
return ret;
return len;
}
static ssize_t show_pwm(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lm3533_led *led = to_lm3533_led(led_cdev);
u8 val;
int ret;
ret = lm3533_ctrlbank_get_pwm(&led->cb, &val);
if (ret)
return ret;
return scnprintf(buf, PAGE_SIZE, "%u\n", val);
}
static ssize_t store_pwm(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lm3533_led *led = to_lm3533_led(led_cdev);
u8 val;
int ret;
if (kstrtou8(buf, 0, &val))
return -EINVAL;
ret = lm3533_ctrlbank_set_pwm(&led->cb, val);
if (ret)
return ret;
return len;
}
static LM3533_ATTR_RW(als_channel);
static LM3533_ATTR_RW(als_en);
static LM3533_ATTR_RW(falltime);
static LM3533_ATTR_RO(id);
static LM3533_ATTR_RW(linear);
static LM3533_ATTR_RW(pwm);
static LM3533_ATTR_RW(risetime);
static struct attribute *lm3533_led_attributes[] = {
&dev_attr_als_channel.attr,
&dev_attr_als_en.attr,
&dev_attr_falltime.attr,
&dev_attr_id.attr,
&dev_attr_linear.attr,
&dev_attr_pwm.attr,
&dev_attr_risetime.attr,
NULL,
};
static umode_t lm3533_led_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lm3533_led *led = to_lm3533_led(led_cdev);
umode_t mode = attr->mode;
if (attr == &dev_attr_als_channel.attr ||
attr == &dev_attr_als_en.attr) {
if (!led->lm3533->have_als)
mode = 0;
}
return mode;
};
static const struct attribute_group lm3533_led_attribute_group = {
.is_visible = lm3533_led_attr_is_visible,
.attrs = lm3533_led_attributes
};
static const struct attribute_group *lm3533_led_attribute_groups[] = {
&lm3533_led_attribute_group,
NULL
};
static int lm3533_led_setup(struct lm3533_led *led,
struct lm3533_led_platform_data *pdata)
{
int ret;
ret = lm3533_ctrlbank_set_max_current(&led->cb, pdata->max_current);
if (ret)
return ret;
return lm3533_ctrlbank_set_pwm(&led->cb, pdata->pwm);
}
static int lm3533_led_probe(struct platform_device *pdev)
{
struct lm3533 *lm3533;
struct lm3533_led_platform_data *pdata;
struct lm3533_led *led;
int ret;
dev_dbg(&pdev->dev, "%s\n", __func__);
lm3533 = dev_get_drvdata(pdev->dev.parent);
if (!lm3533)
return -EINVAL;
pdata = dev_get_platdata(&pdev->dev);
if (!pdata) {
dev_err(&pdev->dev, "no platform data\n");
return -EINVAL;
}
if (pdev->id < 0 || pdev->id >= LM3533_LVCTRLBANK_COUNT) {
dev_err(&pdev->dev, "illegal LED id %d\n", pdev->id);
return -EINVAL;
}
led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
if (!led)
return -ENOMEM;
led->lm3533 = lm3533;
led->cdev.name = pdata->name;
led->cdev.default_trigger = pdata->default_trigger;
led->cdev.brightness_set_blocking = lm3533_led_set;
led->cdev.brightness_get = lm3533_led_get;
led->cdev.blink_set = lm3533_led_blink_set;
led->cdev.brightness = LED_OFF;
led->cdev.groups = lm3533_led_attribute_groups,
led->id = pdev->id;
mutex_init(&led->mutex);
/* The class framework makes a callback to get brightness during
* registration so use parent device (for error reporting) until
* registered.
*/
led->cb.lm3533 = lm3533;
led->cb.id = lm3533_led_get_ctrlbank_id(led);
led->cb.dev = lm3533->dev;
platform_set_drvdata(pdev, led);
ret = led_classdev_register(pdev->dev.parent, &led->cdev);
if (ret) {
dev_err(&pdev->dev, "failed to register LED %d\n", pdev->id);
return ret;
}
led->cb.dev = led->cdev.dev;
ret = lm3533_led_setup(led, pdata);
if (ret)
goto err_deregister;
ret = lm3533_ctrlbank_enable(&led->cb);
if (ret)
goto err_deregister;
return 0;
err_deregister:
led_classdev_unregister(&led->cdev);
return ret;
}
static int lm3533_led_remove(struct platform_device *pdev)
{
struct lm3533_led *led = platform_get_drvdata(pdev);
dev_dbg(&pdev->dev, "%s\n", __func__);
lm3533_ctrlbank_disable(&led->cb);
led_classdev_unregister(&led->cdev);
return 0;
}
static void lm3533_led_shutdown(struct platform_device *pdev)
{
struct lm3533_led *led = platform_get_drvdata(pdev);
dev_dbg(&pdev->dev, "%s\n", __func__);
lm3533_ctrlbank_disable(&led->cb);
lm3533_led_set(&led->cdev, LED_OFF); /* disable blink */
}
static struct platform_driver lm3533_led_driver = {
.driver = {
.name = "lm3533-leds",
},
.probe = lm3533_led_probe,
.remove = lm3533_led_remove,
.shutdown = lm3533_led_shutdown,
};
module_platform_driver(lm3533_led_driver);
MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
MODULE_DESCRIPTION("LM3533 LED driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:lm3533-leds");
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