mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-21 09:34:51 +07:00
6f6d5c3f9a
This patch updates license to use SPDX-License-Identifier
instead of verbose license text.
As original license mentioned, it is GPL-2.0 in SPDX.
Then, MODULE_LICENSE() should be "GPL v2" instead of "GPL".
See ${LINUX}/include/linux/module.h
"GPL" [GNU Public License v2 or later]
"GPL v2" [GNU Public License v2]
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
490 lines
12 KiB
C
490 lines
12 KiB
C
// 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 int max_brightness, struct as3711_bl_data *su)
|
|
{
|
|
struct backlight_properties props = {.type = BACKLIGHT_RAW,};
|
|
struct backlight_device *bl;
|
|
|
|
/* max tuning I = 31uA for voltage- and 38250uA for current-feedback */
|
|
props.max_brightness = max_brightness;
|
|
|
|
bl = devm_backlight_device_register(&pdev->dev,
|
|
su->type == AS3711_BL_SU1 ?
|
|
"as3711-su1" : "as3711-su2",
|
|
&pdev->dev, su,
|
|
&as3711_bl_ops, &props);
|
|
if (IS_ERR(bl)) {
|
|
dev_err(&pdev->dev, "failed to register backlight\n");
|
|
return PTR_ERR(bl);
|
|
}
|
|
|
|
bl->props.brightness = props.max_brightness;
|
|
|
|
backlight_update_status(bl);
|
|
|
|
su->bl = bl;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int as3711_backlight_parse_dt(struct device *dev)
|
|
{
|
|
struct as3711_bl_pdata *pdata = dev_get_platdata(dev);
|
|
struct device_node *bl, *fb;
|
|
int ret;
|
|
|
|
bl = of_get_child_by_name(dev->parent->of_node, "backlight");
|
|
if (!bl) {
|
|
dev_dbg(dev, "backlight node not found\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
fb = of_parse_phandle(bl, "su1-dev", 0);
|
|
if (fb) {
|
|
of_node_put(fb);
|
|
|
|
pdata->su1_fb = true;
|
|
|
|
ret = of_property_read_u32(bl, "su1-max-uA", &pdata->su1_max_uA);
|
|
if (pdata->su1_max_uA <= 0)
|
|
ret = -EINVAL;
|
|
if (ret < 0)
|
|
goto err_put_bl;
|
|
}
|
|
|
|
fb = of_parse_phandle(bl, "su2-dev", 0);
|
|
if (fb) {
|
|
int count = 0;
|
|
|
|
of_node_put(fb);
|
|
|
|
pdata->su2_fb = true;
|
|
|
|
ret = of_property_read_u32(bl, "su2-max-uA", &pdata->su2_max_uA);
|
|
if (pdata->su2_max_uA <= 0)
|
|
ret = -EINVAL;
|
|
if (ret < 0)
|
|
goto err_put_bl;
|
|
|
|
if (of_find_property(bl, "su2-feedback-voltage", NULL)) {
|
|
pdata->su2_feedback = AS3711_SU2_VOLTAGE;
|
|
count++;
|
|
}
|
|
if (of_find_property(bl, "su2-feedback-curr1", NULL)) {
|
|
pdata->su2_feedback = AS3711_SU2_CURR1;
|
|
count++;
|
|
}
|
|
if (of_find_property(bl, "su2-feedback-curr2", NULL)) {
|
|
pdata->su2_feedback = AS3711_SU2_CURR2;
|
|
count++;
|
|
}
|
|
if (of_find_property(bl, "su2-feedback-curr3", NULL)) {
|
|
pdata->su2_feedback = AS3711_SU2_CURR3;
|
|
count++;
|
|
}
|
|
if (of_find_property(bl, "su2-feedback-curr-auto", NULL)) {
|
|
pdata->su2_feedback = AS3711_SU2_CURR_AUTO;
|
|
count++;
|
|
}
|
|
if (count != 1) {
|
|
ret = -EINVAL;
|
|
goto err_put_bl;
|
|
}
|
|
|
|
count = 0;
|
|
if (of_find_property(bl, "su2-fbprot-lx-sd4", NULL)) {
|
|
pdata->su2_fbprot = AS3711_SU2_LX_SD4;
|
|
count++;
|
|
}
|
|
if (of_find_property(bl, "su2-fbprot-gpio2", NULL)) {
|
|
pdata->su2_fbprot = AS3711_SU2_GPIO2;
|
|
count++;
|
|
}
|
|
if (of_find_property(bl, "su2-fbprot-gpio3", NULL)) {
|
|
pdata->su2_fbprot = AS3711_SU2_GPIO3;
|
|
count++;
|
|
}
|
|
if (of_find_property(bl, "su2-fbprot-gpio4", NULL)) {
|
|
pdata->su2_fbprot = AS3711_SU2_GPIO4;
|
|
count++;
|
|
}
|
|
if (count != 1) {
|
|
ret = -EINVAL;
|
|
goto err_put_bl;
|
|
}
|
|
|
|
count = 0;
|
|
if (of_find_property(bl, "su2-auto-curr1", NULL)) {
|
|
pdata->su2_auto_curr1 = true;
|
|
count++;
|
|
}
|
|
if (of_find_property(bl, "su2-auto-curr2", NULL)) {
|
|
pdata->su2_auto_curr2 = true;
|
|
count++;
|
|
}
|
|
if (of_find_property(bl, "su2-auto-curr3", NULL)) {
|
|
pdata->su2_auto_curr3 = true;
|
|
count++;
|
|
}
|
|
|
|
/*
|
|
* At least one su2-auto-curr* must be specified iff
|
|
* AS3711_SU2_CURR_AUTO is used
|
|
*/
|
|
if (!count ^ (pdata->su2_feedback != AS3711_SU2_CURR_AUTO)) {
|
|
ret = -EINVAL;
|
|
goto err_put_bl;
|
|
}
|
|
}
|
|
|
|
of_node_put(bl);
|
|
|
|
return 0;
|
|
|
|
err_put_bl:
|
|
of_node_put(bl);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int as3711_backlight_probe(struct platform_device *pdev)
|
|
{
|
|
struct as3711_bl_pdata *pdata = dev_get_platdata(&pdev->dev);
|
|
struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
|
|
struct as3711_bl_supply *supply;
|
|
struct as3711_bl_data *su;
|
|
unsigned int max_brightness;
|
|
int ret;
|
|
|
|
if (!pdata) {
|
|
dev_err(&pdev->dev, "No platform data, exiting...\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (pdev->dev.parent->of_node) {
|
|
ret = as3711_backlight_parse_dt(&pdev->dev);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (!pdata->su1_fb && !pdata->su2_fb) {
|
|
dev_err(&pdev->dev, "No framebuffer specified\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Due to possible hardware damage I chose to block all modes,
|
|
* unsupported on my hardware. Anyone, wishing to use any of those modes
|
|
* will have to first review the code, then activate and test it.
|
|
*/
|
|
if (pdata->su1_fb ||
|
|
pdata->su2_fbprot != AS3711_SU2_GPIO4 ||
|
|
pdata->su2_feedback != AS3711_SU2_CURR_AUTO) {
|
|
dev_warn(&pdev->dev,
|
|
"Attention! An untested mode has been chosen!\n"
|
|
"Please, review the code, enable, test, and report success:-)\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
supply = devm_kzalloc(&pdev->dev, sizeof(*supply), GFP_KERNEL);
|
|
if (!supply)
|
|
return -ENOMEM;
|
|
|
|
supply->as3711 = as3711;
|
|
supply->pdata = pdata;
|
|
|
|
if (pdata->su1_fb) {
|
|
su = &supply->su1;
|
|
su->type = AS3711_BL_SU1;
|
|
|
|
max_brightness = min(pdata->su1_max_uA, 31);
|
|
ret = as3711_bl_register(pdev, max_brightness, su);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (pdata->su2_fb) {
|
|
su = &supply->su2;
|
|
su->type = AS3711_BL_SU2;
|
|
|
|
switch (pdata->su2_fbprot) {
|
|
case AS3711_SU2_GPIO2:
|
|
case AS3711_SU2_GPIO3:
|
|
case AS3711_SU2_GPIO4:
|
|
case AS3711_SU2_LX_SD4:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (pdata->su2_feedback) {
|
|
case AS3711_SU2_VOLTAGE:
|
|
max_brightness = min(pdata->su2_max_uA, 31);
|
|
break;
|
|
case AS3711_SU2_CURR1:
|
|
case AS3711_SU2_CURR2:
|
|
case AS3711_SU2_CURR3:
|
|
case AS3711_SU2_CURR_AUTO:
|
|
max_brightness = min(pdata->su2_max_uA / 150, 255);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = as3711_bl_init_su2(supply);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = as3711_bl_register(pdev, max_brightness, su);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, supply);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver as3711_backlight_driver = {
|
|
.driver = {
|
|
.name = "as3711-backlight",
|
|
},
|
|
.probe = as3711_backlight_probe,
|
|
};
|
|
|
|
module_platform_driver(as3711_backlight_driver);
|
|
|
|
MODULE_DESCRIPTION("Backlight Driver for AS3711 PMICs");
|
|
MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:as3711-backlight");
|