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backlight: add LM3533 backlight driver

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Add sub-driver for the backlights on National Semiconductor / TI LM3533
lighting power chips.

The chip provides 256 brightness levels and ambient-light-sensor and pwm
input control.

[akpm@linux-foundation.org: fix warning]
[akpm@linux-foundation.org: fix the type of `mode']
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Rob Landley <rob@landley.net>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johan Hovold 2012-05-29 15:07:14 -07:00 committed by Linus Torvalds
parent 1615d210db
commit 7f26c970b4
4 changed files with 484 additions and 0 deletions
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48
Documentation/ABI/testing/sysfs-class-backlight-driver-lm3533 Normal file
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@ -0,0 +1,48 @@
What: /sys/class/backlight/<backlight>/als_channel
Date: May 2012
KernelVersion: 3.5
Contact: Johan Hovold <jhovold@gmail.com>
Description:
Get the ALS output channel used as input in
ALS-current-control mode (0, 1), where
0 - out_current0 (backlight 0)
1 - out_current1 (backlight 1)
What: /sys/class/backlight/<backlight>/als_en
Date: May 2012
KernelVersion: 3.5
Contact: Johan Hovold <jhovold@gmail.com>
Description:
Enable ALS-current-control mode (0, 1).
What: /sys/class/backlight/<backlight>/id
Date: April 2012
KernelVersion: 3.5
Contact: Johan Hovold <jhovold@gmail.com>
Description:
Get the id of this backlight (0, 1).
What: /sys/class/backlight/<backlight>/linear
Date: April 2012
KernelVersion: 3.5
Contact: Johan Hovold <jhovold@gmail.com>
Description:
Set the brightness-mapping mode (0, 1), where
0 - exponential mode
1 - linear mode
What: /sys/class/backlight/<backlight>/pwm
Date: April 2012
KernelVersion: 3.5
Contact: Johan Hovold <jhovold@gmail.com>
Description:
Set the PWM-input control mask (5 bits), where
bit 5 - PWM-input enabled in Zone 4
bit 4 - PWM-input enabled in Zone 3
bit 3 - PWM-input enabled in Zone 2
bit 2 - PWM-input enabled in Zone 1
bit 1 - PWM-input enabled in Zone 0
bit 0 - PWM-input enabled

12
drivers/video/backlight/Kconfig
View file

@ -184,6 +184,18 @@ config BACKLIGHT_GENERIC
known as the Corgi backlight driver. If you have a Sharp Zaurus
SL-C7xx, SL-Cxx00 or SL-6000x say y.
config BACKLIGHT_LM3533
tristate "Backlight Driver for LM3533"
depends on BACKLIGHT_CLASS_DEVICE
depends on MFD_LM3533
help
Say Y to enable the backlight driver for National Semiconductor / TI
LM3533 Lighting Power chips.
The backlights can be controlled directly, through PWM input, or by
the ambient-light-sensor interface. The chip supports 256 brightness
levels.
config BACKLIGHT_LOCOMO
tristate "Sharp LOCOMO LCD/Backlight Driver"
depends on SHARP_LOCOMO

1
drivers/video/backlight/Makefile
View file

@ -21,6 +21,7 @@ obj-$(CONFIG_BACKLIGHT_EP93XX) += ep93xx_bl.o
obj-$(CONFIG_BACKLIGHT_GENERIC) += generic_bl.o
obj-$(CONFIG_BACKLIGHT_HP700) += jornada720_bl.o
obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o
obj-$(CONFIG_BACKLIGHT_LM3533) += lm3533_bl.o
obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o
obj-$(CONFIG_BACKLIGHT_LP855X) += lp855x_bl.o
obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o

423
drivers/video/backlight/lm3533_bl.c Normal file
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@ -0,0 +1,423 @@
/*
* lm3533-bl.c -- LM3533 Backlight driver
*
* Copyright (C) 2011-2012 Texas Instruments
*
* Author: Johan Hovold <jhovold@gmail.com>
*
* 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.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/backlight.h>
#include <linux/fb.h>
#include <linux/slab.h>
#include <linux/mfd/lm3533.h>
#define LM3533_HVCTRLBANK_COUNT 2
#define LM3533_BL_MAX_BRIGHTNESS 255
#define LM3533_REG_CTRLBANK_AB_BCONF 0x1a
struct lm3533_bl {
struct lm3533 *lm3533;
struct lm3533_ctrlbank cb;
struct backlight_device *bd;
int id;
};
static inline int lm3533_bl_get_ctrlbank_id(struct lm3533_bl *bl)
{
return bl->id;
}
static int lm3533_bl_update_status(struct backlight_device *bd)
{
struct lm3533_bl *bl = bl_get_data(bd);
int brightness = bd->props.brightness;
if (bd->props.power != FB_BLANK_UNBLANK)
brightness = 0;
if (bd->props.fb_blank != FB_BLANK_UNBLANK)
brightness = 0;
return lm3533_ctrlbank_set_brightness(&bl->cb, (u8)brightness);
}
static int lm3533_bl_get_brightness(struct backlight_device *bd)
{
struct lm3533_bl *bl = bl_get_data(bd);
u8 val;
int ret;
ret = lm3533_ctrlbank_get_brightness(&bl->cb, &val);
if (ret)
return ret;
return val;
}
static const struct backlight_ops lm3533_bl_ops = {
.get_brightness = lm3533_bl_get_brightness,
.update_status = lm3533_bl_update_status,
};
static ssize_t show_id(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm3533_bl *bl = dev_get_drvdata(dev);
return scnprintf(buf, PAGE_SIZE, "%d\n", bl->id);
}
static ssize_t show_als_channel(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm3533_bl *bl = dev_get_drvdata(dev);
unsigned channel = lm3533_bl_get_ctrlbank_id(bl);
return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
}
static ssize_t show_als_en(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm3533_bl *bl = dev_get_drvdata(dev);
int ctrlbank = lm3533_bl_get_ctrlbank_id(bl);
u8 val;
u8 mask;
bool enable;
int ret;
ret = lm3533_read(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, &val);
if (ret)
return ret;
mask = 1 << (2 * ctrlbank);
enable = val & 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 lm3533_bl *bl = dev_get_drvdata(dev);
int ctrlbank = lm3533_bl_get_ctrlbank_id(bl);
int enable;
u8 val;
u8 mask;
int ret;
if (kstrtoint(buf, 0, &enable))
return -EINVAL;
mask = 1 << (2 * ctrlbank);
if (enable)
val = mask;
else
val = 0;
ret = lm3533_update(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, val,
mask);
if (ret)
return ret;
return len;
}
static ssize_t show_linear(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm3533_bl *bl = dev_get_drvdata(dev);
u8 val;
u8 mask;
int linear;
int ret;
ret = lm3533_read(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, &val);
if (ret)
return ret;
mask = 1 << (2 * lm3533_bl_get_ctrlbank_id(bl) + 1);
if (val & 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 lm3533_bl *bl = dev_get_drvdata(dev);
unsigned long linear;
u8 mask;
u8 val;
int ret;
if (kstrtoul(buf, 0, &linear))
return -EINVAL;
mask = 1 << (2 * lm3533_bl_get_ctrlbank_id(bl) + 1);
if (linear)
val = mask;
else
val = 0;
ret = lm3533_update(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, val,
mask);
if (ret)
return ret;
return len;
}
static ssize_t show_pwm(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct lm3533_bl *bl = dev_get_drvdata(dev);
u8 val;
int ret;
ret = lm3533_ctrlbank_get_pwm(&bl->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 lm3533_bl *bl = dev_get_drvdata(dev);
u8 val;
int ret;
if (kstrtou8(buf, 0, &val))
return -EINVAL;
ret = lm3533_ctrlbank_set_pwm(&bl->cb, val);
if (ret)
return ret;
return len;
}
static LM3533_ATTR_RO(als_channel);
static LM3533_ATTR_RW(als_en);
static LM3533_ATTR_RO(id);
static LM3533_ATTR_RW(linear);
static LM3533_ATTR_RW(pwm);
static struct attribute *lm3533_bl_attributes[] = {
&dev_attr_als_channel.attr,
&dev_attr_als_en.attr,
&dev_attr_id.attr,
&dev_attr_linear.attr,
&dev_attr_pwm.attr,
NULL,
};
static umode_t lm3533_bl_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct lm3533_bl *bl = dev_get_drvdata(dev);
umode_t mode = attr->mode;
if (attr == &dev_attr_als_channel.attr ||
attr == &dev_attr_als_en.attr) {
if (!bl->lm3533->have_als)
mode = 0;
}
return mode;
};
static struct attribute_group lm3533_bl_attribute_group = {
.is_visible = lm3533_bl_attr_is_visible,
.attrs = lm3533_bl_attributes
};
static int __devinit lm3533_bl_setup(struct lm3533_bl *bl,
struct lm3533_bl_platform_data *pdata)
{
int ret;
ret = lm3533_ctrlbank_set_max_current(&bl->cb, pdata->max_current);
if (ret)
return ret;
return lm3533_ctrlbank_set_pwm(&bl->cb, pdata->pwm);
}
static int __devinit lm3533_bl_probe(struct platform_device *pdev)
{
struct lm3533 *lm3533;
struct lm3533_bl_platform_data *pdata;
struct lm3533_bl *bl;
struct backlight_device *bd;
struct backlight_properties props;
int ret;
dev_dbg(&pdev->dev, "%s\n", __func__);
lm3533 = dev_get_drvdata(pdev->dev.parent);
if (!lm3533)
return -EINVAL;
pdata = pdev->dev.platform_data;
if (!pdata) {
dev_err(&pdev->dev, "no platform data\n");
return -EINVAL;
}
if (pdev->id < 0 || pdev->id >= LM3533_HVCTRLBANK_COUNT) {
dev_err(&pdev->dev, "illegal backlight id %d\n", pdev->id);
return -EINVAL;
}
bl = kzalloc(sizeof(*bl), GFP_KERNEL);
if (!bl) {
dev_err(&pdev->dev,
"failed to allocate memory for backlight\n");
return -ENOMEM;
}
bl->lm3533 = lm3533;
bl->id = pdev->id;
bl->cb.lm3533 = lm3533;
bl->cb.id = lm3533_bl_get_ctrlbank_id(bl);
bl->cb.dev = NULL; /* until registered */
memset(&props, 0, sizeof(props));
props.type = BACKLIGHT_RAW;
props.max_brightness = LM3533_BL_MAX_BRIGHTNESS;
props.brightness = pdata->default_brightness;
bd = backlight_device_register(pdata->name, pdev->dev.parent, bl,
&lm3533_bl_ops, &props);
if (IS_ERR(bd)) {
dev_err(&pdev->dev, "failed to register backlight device\n");
ret = PTR_ERR(bd);
goto err_free;
}
bl->bd = bd;
bl->cb.dev = &bl->bd->dev;
platform_set_drvdata(pdev, bl);
ret = sysfs_create_group(&bd->dev.kobj, &lm3533_bl_attribute_group);
if (ret < 0) {
dev_err(&pdev->dev, "failed to create sysfs attributes\n");
goto err_unregister;
}
backlight_update_status(bd);
ret = lm3533_bl_setup(bl, pdata);
if (ret)
goto err_sysfs_remove;
ret = lm3533_ctrlbank_enable(&bl->cb);
if (ret)
goto err_sysfs_remove;
return 0;
err_sysfs_remove:
sysfs_remove_group(&bd->dev.kobj, &lm3533_bl_attribute_group);
err_unregister:
backlight_device_unregister(bd);
err_free:
kfree(bl);
return ret;
}
static int __devexit lm3533_bl_remove(struct platform_device *pdev)
{
struct lm3533_bl *bl = platform_get_drvdata(pdev);
struct backlight_device *bd = bl->bd;
dev_dbg(&bd->dev, "%s\n", __func__);
bd->props.power = FB_BLANK_POWERDOWN;
bd->props.brightness = 0;
lm3533_ctrlbank_disable(&bl->cb);
sysfs_remove_group(&bd->dev.kobj, &lm3533_bl_attribute_group);
backlight_device_unregister(bd);
kfree(bl);
return 0;
}
#ifdef CONFIG_PM
static int lm3533_bl_suspend(struct platform_device *pdev, pm_message_t state)
{
struct lm3533_bl *bl = platform_get_drvdata(pdev);
dev_dbg(&pdev->dev, "%s\n", __func__);
return lm3533_ctrlbank_disable(&bl->cb);
}
static int lm3533_bl_resume(struct platform_device *pdev)
{
struct lm3533_bl *bl = platform_get_drvdata(pdev);
dev_dbg(&pdev->dev, "%s\n", __func__);
return lm3533_ctrlbank_enable(&bl->cb);
}
#else
#define lm3533_bl_suspend NULL
#define lm3533_bl_resume NULL
#endif
static void lm3533_bl_shutdown(struct platform_device *pdev)
{
struct lm3533_bl *bl = platform_get_drvdata(pdev);
dev_dbg(&pdev->dev, "%s\n", __func__);
lm3533_ctrlbank_disable(&bl->cb);
}
static struct platform_driver lm3533_bl_driver = {
.driver = {
.name = "lm3533-backlight",
.owner = THIS_MODULE,
},
.probe = lm3533_bl_probe,
.remove = __devexit_p(lm3533_bl_remove),
.shutdown = lm3533_bl_shutdown,
.suspend = lm3533_bl_suspend,
.resume = lm3533_bl_resume,
};
module_platform_driver(lm3533_bl_driver);
MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
MODULE_DESCRIPTION("LM3533 Backlight driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:lm3533-backlight");