335 lines
7.5 KiB
C
Executable file
335 lines
7.5 KiB
C
Executable file
/*
|
|
* tps65217_bl.c
|
|
*
|
|
* TPS65217 backlight driver
|
|
*
|
|
* Copyright (C) 2012 Matthias Kaehlcke
|
|
* Author: Matthias Kaehlcke <matthias@kaehlcke.net>
|
|
*
|
|
* 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 version 2.
|
|
*
|
|
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
|
|
* kind, whether express or implied; without even the implied warranty
|
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/backlight.h>
|
|
#include <linux/err.h>
|
|
#include <linux/fb.h>
|
|
#include <linux/mfd/tps65217.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
|
|
struct tps65217_bl {
|
|
struct tps65217 *tps;
|
|
struct device *dev;
|
|
struct backlight_device *bl;
|
|
bool is_enabled;
|
|
};
|
|
|
|
static int tps65217_bl_enable(struct tps65217_bl *tps65217_bl)
|
|
{
|
|
int rc;
|
|
|
|
rc = tps65217_set_bits(tps65217_bl->tps, TPS65217_REG_WLEDCTRL1,
|
|
TPS65217_WLEDCTRL1_ISINK_ENABLE,
|
|
TPS65217_WLEDCTRL1_ISINK_ENABLE, TPS65217_PROTECT_NONE);
|
|
if (rc) {
|
|
dev_err(tps65217_bl->dev,
|
|
"failed to enable backlight: %d\n", rc);
|
|
return rc;
|
|
}
|
|
|
|
tps65217_bl->is_enabled = true;
|
|
|
|
dev_dbg(tps65217_bl->dev, "backlight enabled\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tps65217_bl_disable(struct tps65217_bl *tps65217_bl)
|
|
{
|
|
int rc;
|
|
|
|
rc = tps65217_clear_bits(tps65217_bl->tps,
|
|
TPS65217_REG_WLEDCTRL1,
|
|
TPS65217_WLEDCTRL1_ISINK_ENABLE,
|
|
TPS65217_PROTECT_NONE);
|
|
if (rc) {
|
|
dev_err(tps65217_bl->dev,
|
|
"failed to disable backlight: %d\n", rc);
|
|
return rc;
|
|
}
|
|
|
|
tps65217_bl->is_enabled = false;
|
|
|
|
dev_dbg(tps65217_bl->dev, "backlight disabled\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tps65217_bl_update_status(struct backlight_device *bl)
|
|
{
|
|
struct tps65217_bl *tps65217_bl = bl_get_data(bl);
|
|
int rc;
|
|
int brightness = bl->props.brightness;
|
|
|
|
if (bl->props.state & BL_CORE_SUSPENDED)
|
|
brightness = 0;
|
|
|
|
if ((bl->props.power != FB_BLANK_UNBLANK) ||
|
|
(bl->props.fb_blank != FB_BLANK_UNBLANK))
|
|
/* framebuffer in low power mode or blanking active */
|
|
brightness = 0;
|
|
|
|
if (brightness > 0) {
|
|
rc = tps65217_reg_write(tps65217_bl->tps,
|
|
TPS65217_REG_WLEDCTRL2,
|
|
brightness - 1,
|
|
TPS65217_PROTECT_NONE);
|
|
if (rc) {
|
|
dev_err(tps65217_bl->dev,
|
|
"failed to set brightness level: %d\n", rc);
|
|
return rc;
|
|
}
|
|
|
|
dev_dbg(tps65217_bl->dev, "brightness set to %d\n", brightness);
|
|
|
|
if (!tps65217_bl->is_enabled)
|
|
rc = tps65217_bl_enable(tps65217_bl);
|
|
} else {
|
|
rc = tps65217_bl_disable(tps65217_bl);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static const struct backlight_ops tps65217_bl_ops = {
|
|
.options = BL_CORE_SUSPENDRESUME,
|
|
.update_status = tps65217_bl_update_status,
|
|
};
|
|
|
|
static int tps65217_bl_hw_init(struct tps65217_bl *tps65217_bl,
|
|
struct tps65217_bl_pdata *pdata)
|
|
{
|
|
int rc;
|
|
|
|
rc = tps65217_bl_disable(tps65217_bl);
|
|
if (rc)
|
|
return rc;
|
|
|
|
switch (pdata->isel) {
|
|
case TPS65217_BL_ISET1:
|
|
/* select ISET_1 current level */
|
|
rc = tps65217_clear_bits(tps65217_bl->tps,
|
|
TPS65217_REG_WLEDCTRL1,
|
|
TPS65217_WLEDCTRL1_ISEL,
|
|
TPS65217_PROTECT_NONE);
|
|
if (rc) {
|
|
dev_err(tps65217_bl->dev,
|
|
"failed to select ISET1 current level: %d)\n",
|
|
rc);
|
|
return rc;
|
|
}
|
|
|
|
dev_dbg(tps65217_bl->dev, "selected ISET1 current level\n");
|
|
|
|
break;
|
|
|
|
case TPS65217_BL_ISET2:
|
|
/* select ISET2 current level */
|
|
rc = tps65217_set_bits(tps65217_bl->tps, TPS65217_REG_WLEDCTRL1,
|
|
TPS65217_WLEDCTRL1_ISEL,
|
|
TPS65217_WLEDCTRL1_ISEL, TPS65217_PROTECT_NONE);
|
|
if (rc) {
|
|
dev_err(tps65217_bl->dev,
|
|
"failed to select ISET2 current level: %d\n",
|
|
rc);
|
|
return rc;
|
|
}
|
|
|
|
dev_dbg(tps65217_bl->dev, "selected ISET2 current level\n");
|
|
|
|
break;
|
|
|
|
default:
|
|
dev_err(tps65217_bl->dev,
|
|
"invalid value for current level: %d\n", pdata->isel);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* set PWM frequency */
|
|
rc = tps65217_set_bits(tps65217_bl->tps,
|
|
TPS65217_REG_WLEDCTRL1,
|
|
TPS65217_WLEDCTRL1_FDIM_MASK,
|
|
pdata->fdim,
|
|
TPS65217_PROTECT_NONE);
|
|
if (rc) {
|
|
dev_err(tps65217_bl->dev,
|
|
"failed to select PWM dimming frequency: %d\n",
|
|
rc);
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static struct tps65217_bl_pdata *
|
|
tps65217_bl_parse_dt(struct platform_device *pdev)
|
|
{
|
|
struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
|
|
struct device_node *node;
|
|
struct tps65217_bl_pdata *pdata, *err;
|
|
u32 val;
|
|
|
|
node = of_get_child_by_name(tps->dev->of_node, "backlight");
|
|
if (!node)
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata) {
|
|
err = ERR_PTR(-ENOMEM);
|
|
goto err;
|
|
}
|
|
|
|
pdata->isel = TPS65217_BL_ISET1;
|
|
if (!of_property_read_u32(node, "isel", &val)) {
|
|
if (val < TPS65217_BL_ISET1 ||
|
|
val > TPS65217_BL_ISET2) {
|
|
dev_err(&pdev->dev,
|
|
"invalid 'isel' value in the device tree\n");
|
|
err = ERR_PTR(-EINVAL);
|
|
goto err;
|
|
}
|
|
|
|
pdata->isel = val;
|
|
}
|
|
|
|
pdata->fdim = TPS65217_BL_FDIM_200HZ;
|
|
if (!of_property_read_u32(node, "fdim", &val)) {
|
|
switch (val) {
|
|
case 100:
|
|
pdata->fdim = TPS65217_BL_FDIM_100HZ;
|
|
break;
|
|
|
|
case 200:
|
|
pdata->fdim = TPS65217_BL_FDIM_200HZ;
|
|
break;
|
|
|
|
case 500:
|
|
pdata->fdim = TPS65217_BL_FDIM_500HZ;
|
|
break;
|
|
|
|
case 1000:
|
|
pdata->fdim = TPS65217_BL_FDIM_1000HZ;
|
|
break;
|
|
|
|
default:
|
|
dev_err(&pdev->dev,
|
|
"invalid 'fdim' value in the device tree\n");
|
|
err = ERR_PTR(-EINVAL);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
if (!of_property_read_u32(node, "default-brightness", &val)) {
|
|
if (val > 100) {
|
|
dev_err(&pdev->dev,
|
|
"invalid 'default-brightness' value in the device tree\n");
|
|
err = ERR_PTR(-EINVAL);
|
|
goto err;
|
|
}
|
|
|
|
pdata->dft_brightness = val;
|
|
}
|
|
|
|
of_node_put(node);
|
|
|
|
return pdata;
|
|
|
|
err:
|
|
of_node_put(node);
|
|
|
|
return err;
|
|
}
|
|
#else
|
|
static struct tps65217_bl_pdata *
|
|
tps65217_bl_parse_dt(struct platform_device *pdev)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
static int tps65217_bl_probe(struct platform_device *pdev)
|
|
{
|
|
int rc;
|
|
struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
|
|
struct tps65217_bl *tps65217_bl;
|
|
struct tps65217_bl_pdata *pdata;
|
|
struct backlight_properties bl_props;
|
|
|
|
pdata = tps65217_bl_parse_dt(pdev);
|
|
if (IS_ERR(pdata))
|
|
return PTR_ERR(pdata);
|
|
|
|
tps65217_bl = devm_kzalloc(&pdev->dev, sizeof(*tps65217_bl),
|
|
GFP_KERNEL);
|
|
if (tps65217_bl == NULL)
|
|
return -ENOMEM;
|
|
|
|
tps65217_bl->tps = tps;
|
|
tps65217_bl->dev = &pdev->dev;
|
|
tps65217_bl->is_enabled = false;
|
|
|
|
rc = tps65217_bl_hw_init(tps65217_bl, pdata);
|
|
if (rc)
|
|
return rc;
|
|
|
|
memset(&bl_props, 0, sizeof(struct backlight_properties));
|
|
bl_props.type = BACKLIGHT_RAW;
|
|
bl_props.max_brightness = 100;
|
|
|
|
tps65217_bl->bl = devm_backlight_device_register(&pdev->dev, pdev->name,
|
|
tps65217_bl->dev, tps65217_bl,
|
|
&tps65217_bl_ops, &bl_props);
|
|
if (IS_ERR(tps65217_bl->bl)) {
|
|
dev_err(tps65217_bl->dev,
|
|
"registration of backlight device failed: %d\n", rc);
|
|
return PTR_ERR(tps65217_bl->bl);
|
|
}
|
|
|
|
tps65217_bl->bl->props.brightness = pdata->dft_brightness;
|
|
backlight_update_status(tps65217_bl->bl);
|
|
platform_set_drvdata(pdev, tps65217_bl);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id tps65217_bl_of_match[] = {
|
|
{ .compatible = "ti,tps65217-bl", },
|
|
{ /* sentinel */ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, tps65217_bl_of_match);
|
|
#endif
|
|
|
|
static struct platform_driver tps65217_bl_driver = {
|
|
.probe = tps65217_bl_probe,
|
|
.driver = {
|
|
.name = "tps65217-bl",
|
|
.of_match_table = of_match_ptr(tps65217_bl_of_match),
|
|
},
|
|
};
|
|
|
|
module_platform_driver(tps65217_bl_driver);
|
|
|
|
MODULE_DESCRIPTION("TPS65217 Backlight driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Matthias Kaehlcke <matthias@kaehlcke.net>");
|