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|
// SPDX-License-Identifier: GPL-2.0
/*
* AS3711 PMIC backlight driver, using DCDC Step Up Converters
*
* Copyright (C) 2012 Renesas Electronics Corporation
* Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
*/
#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/fb.h>
#include <linux/kernel.h>
#include <linux/mfd/as3711.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
enum as3711_bl_type {
AS3711_BL_SU1,
AS3711_BL_SU2,
};
struct as3711_bl_data {
bool powered;
enum as3711_bl_type type;
int brightness;
struct backlight_device *bl;
};
struct as3711_bl_supply {
struct as3711_bl_data su1;
struct as3711_bl_data su2;
const struct as3711_bl_pdata *pdata;
struct as3711 *as3711;
};
static struct as3711_bl_supply *to_supply(struct as3711_bl_data *su)
{
switch (su->type) {
case AS3711_BL_SU1:
return container_of(su, struct as3711_bl_supply, su1);
case AS3711_BL_SU2:
return container_of(su, struct as3711_bl_supply, su2);
}
return NULL;
}
static int as3711_set_brightness_auto_i(struct as3711_bl_data *data,
unsigned int brightness)
{
struct as3711_bl_supply *supply = to_supply(data);
struct as3711 *as3711 = supply->as3711;
const struct as3711_bl_pdata *pdata = supply->pdata;
int ret = 0;
/* Only all equal current values are supported */
if (pdata->su2_auto_curr1)
ret = regmap_write(as3711->regmap, AS3711_CURR1_VALUE,
brightness);
if (!ret && pdata->su2_auto_curr2)
ret = regmap_write(as3711->regmap, AS3711_CURR2_VALUE,
brightness);
if (!ret && pdata->su2_auto_curr3)
ret = regmap_write(as3711->regmap, AS3711_CURR3_VALUE,
brightness);
return ret;
}
static int as3711_set_brightness_v(struct as3711 *as3711,
unsigned int brightness,
unsigned int reg)
{
if (brightness > 31)
return -EINVAL;
return regmap_update_bits(as3711->regmap, reg, 0xf0,
brightness << 4);
}
static int as3711_bl_su2_reset(struct as3711_bl_supply *supply)
{
struct as3711 *as3711 = supply->as3711;
int ret = regmap_update_bits(as3711->regmap, AS3711_STEPUP_CONTROL_5,
3, supply->pdata->su2_fbprot);
if (!ret)
ret = regmap_update_bits(as3711->regmap,
AS3711_STEPUP_CONTROL_2, 1, 0);
if (!ret)
ret = regmap_update_bits(as3711->regmap,
AS3711_STEPUP_CONTROL_2, 1, 1);
return ret;
}
/*
* Someone with less fragile or less expensive hardware could try to simplify
* the brightness adjustment procedure.
*/
static int as3711_bl_update_status(struct backlight_device *bl)
{
struct as3711_bl_data *data = bl_get_data(bl);
struct as3711_bl_supply *supply = to_supply(data);
struct as3711 *as3711 = supply->as3711;
int brightness = bl->props.brightness;
int ret = 0;
dev_dbg(&bl->dev, "%s(): brightness %u, pwr %x, blank %x, state %x\n",
__func__, bl->props.brightness, bl->props.power,
bl->props.fb_blank, bl->props.state);
if (bl->props.power != FB_BLANK_UNBLANK ||
bl->props.fb_blank != FB_BLANK_UNBLANK ||
bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
brightness = 0;
if (data->type == AS3711_BL_SU1) {
ret = as3711_set_brightness_v(as3711, brightness,
AS3711_STEPUP_CONTROL_1);
} else {
const struct as3711_bl_pdata *pdata = supply->pdata;
switch (pdata->su2_feedback) {
case AS3711_SU2_VOLTAGE:
ret = as3711_set_brightness_v(as3711, brightness,
AS3711_STEPUP_CONTROL_2);
break;
case AS3711_SU2_CURR_AUTO:
ret = as3711_set_brightness_auto_i(data, brightness / 4);
if (ret < 0)
return ret;
if (brightness) {
ret = as3711_bl_su2_reset(supply);
if (ret < 0)
return ret;
udelay(500);
ret = as3711_set_brightness_auto_i(data, brightness);
} else {
ret = regmap_update_bits(as3711->regmap,
AS3711_STEPUP_CONTROL_2, 1, 0);
}
break;
/* Manual one current feedback pin below */
case AS3711_SU2_CURR1:
ret = regmap_write(as3711->regmap, AS3711_CURR1_VALUE,
brightness);
break;
case AS3711_SU2_CURR2:
ret = regmap_write(as3711->regmap, AS3711_CURR2_VALUE,
brightness);
break;
case AS3711_SU2_CURR3:
ret = regmap_write(as3711->regmap, AS3711_CURR3_VALUE,
brightness);
break;
default:
ret = -EINVAL;
}
}
if (!ret)
data->brightness = brightness;
return ret;
}
static int as3711_bl_get_brightness(struct backlight_device *bl)
{
struct as3711_bl_data *data = bl_get_data(bl);
return data->brightness;
}
static const struct backlight_ops as3711_bl_ops = {
.update_status = as3711_bl_update_status,
.get_brightness = as3711_bl_get_brightness,
};
static int as3711_bl_init_su2(struct as3711_bl_supply *supply)
{
struct as3711 *as3711 = supply->as3711;
const struct as3711_bl_pdata *pdata = supply->pdata;
u8 ctl = 0;
int ret;
dev_dbg(as3711->dev, "%s(): use %u\n", __func__, pdata->su2_feedback);
/* Turn SU2 off */
ret = regmap_write(as3711->regmap, AS3711_STEPUP_CONTROL_2, 0);
if (ret < 0)
return ret;
switch (pdata->su2_feedback) {
case AS3711_SU2_VOLTAGE:
ret = regmap_update_bits(as3711->regmap, AS3711_STEPUP_CONTROL_4, 3, 0);
break;
case AS3711_SU2_CURR1:
ctl = 1;
ret = regmap_update_bits(as3711->regmap, AS3711_STEPUP_CONTROL_4, 3, 1);
break;
case AS3711_SU2_CURR2:
ctl = 4;
ret = regmap_update_bits(as3711->regmap, AS3711_STEPUP_CONTROL_4, 3, 2);
break;
case AS3711_SU2_CURR3:
ctl = 0x10;
ret = regmap_update_bits(as3711->regmap, AS3711_STEPUP_CONTROL_4, 3, 3);
break;
case AS3711_SU2_CURR_AUTO:
if (pdata->su2_auto_curr1)
ctl = 2;
if (pdata->su2_auto_curr2)
ctl |= 8;
if (pdata->su2_auto_curr3)
ctl |= 0x20;
ret = 0;
break;
default:
return -EINVAL;
}
if (!ret)
ret = regmap_write(as3711->regmap, AS3711_CURR_CONTROL, ctl);
return ret;
}
static int as3711_bl_register(struct platform_device *pdev,
unsigned
|