353 lines
7.8 KiB
C
353 lines
7.8 KiB
C
|
/*
|
||
|
* 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 int tps65217_bl_get_brightness(struct backlight_device *bl)
|
||
|
{
|
||
|
return bl->props.brightness;
|
||
|
}
|
||
|
|
||
|
static const struct backlight_ops tps65217_bl_ops = {
|
||
|
.options = BL_CORE_SUSPENDRESUME,
|
||
|
.update_status = tps65217_bl_update_status,
|
||
|
.get_brightness = tps65217_bl_get_brightness
|
||
|
};
|
||
|
|
||
|
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 = of_node_get(tps->dev->of_node);
|
||
|
struct tps65217_bl_pdata *pdata, *err;
|
||
|
u32 val;
|
||
|
|
||
|
node = of_find_node_by_name(node, "backlight");
|
||
|
if (!node)
|
||
|
return ERR_PTR(-ENODEV);
|
||
|
|
||
|
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
|
||
|
if (!pdata) {
|
||
|
dev_err(&pdev->dev, "failed to allocate platform data\n");
|
||
|
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;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
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;
|
||
|
|
||
|
if (tps->dev->of_node) {
|
||
|
pdata = tps65217_bl_parse_dt(pdev);
|
||
|
if (IS_ERR(pdata))
|
||
|
return PTR_ERR(pdata);
|
||
|
} else {
|
||
|
if (!pdev->dev.platform_data) {
|
||
|
dev_err(&pdev->dev, "no platform data provided\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
pdata = pdev->dev.platform_data;
|
||
|
}
|
||
|
|
||
|
tps65217_bl = devm_kzalloc(&pdev->dev, sizeof(*tps65217_bl),
|
||
|
GFP_KERNEL);
|
||
|
if (tps65217_bl == NULL) {
|
||
|
dev_err(&pdev->dev, "allocation of struct tps65217_bl failed\n");
|
||
|
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 = backlight_device_register(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 = 0;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int tps65217_bl_remove(struct platform_device *pdev)
|
||
|
{
|
||
|
struct tps65217_bl *tps65217_bl = platform_get_drvdata(pdev);
|
||
|
|
||
|
backlight_device_unregister(tps65217_bl->bl);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static struct platform_driver tps65217_bl_driver = {
|
||
|
.probe = tps65217_bl_probe,
|
||
|
.remove = tps65217_bl_remove,
|
||
|
.driver = {
|
||
|
.owner = THIS_MODULE,
|
||
|
.name = "tps65217-bl",
|
||
|
},
|
||
|
};
|
||
|
|
||
|
static int __init tps65217_bl_init(void)
|
||
|
{
|
||
|
return platform_driver_register(&tps65217_bl_driver);
|
||
|
}
|
||
|
|
||
|
static void __exit tps65217_bl_exit(void)
|
||
|
{
|
||
|
platform_driver_unregister(&tps65217_bl_driver);
|
||
|
}
|
||
|
|
||
|
module_init(tps65217_bl_init);
|
||
|
module_exit(tps65217_bl_exit);
|
||
|
|
||
|
MODULE_DESCRIPTION("TPS65217 Backlight driver");
|
||
|
MODULE_LICENSE("GPL v2");
|
||
|
MODULE_AUTHOR("Matthias Kaehlcke <matthias@kaehlcke.net>");
|