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linux-next/drivers/leds/leds-sc27xx-bltc.c
Uwe Kleine-König 6bdc6d4a37 leds: Switch back to struct platform_driver::remove() 
After commit 0edb555a65 ("platform: Make platform_driver::remove()
return void") .remove() is (again) the right callback to implement for
platform drivers.

Convert all platform drivers below drivers/leds/ to use .remove(), with
the eventual goal to drop struct platform_driver::remove_new(). As
.remove() and .remove_new() have the same prototypes, conversion is done
by just changing the structure member name in the driver initializer.

While touching these files, make indention of the struct initializer
consistent in several files.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/20241010203622.839625-5-u.kleine-koenig@baylibre.com
Signed-off-by: Lee Jones <lee@kernel.org>
2024-10-15 09:58:10 +01:00

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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 Spreadtrum Communications Inc.
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
/* PMIC global control register definition */
#define SC27XX_MODULE_EN0 0xc08
#define SC27XX_CLK_EN0 0xc18
#define SC27XX_RGB_CTRL 0xebc
#define SC27XX_BLTC_EN BIT(9)
#define SC27XX_RTC_EN BIT(7)
#define SC27XX_RGB_PD BIT(0)
/* Breathing light controller register definition */
#define SC27XX_LEDS_CTRL 0x00
#define SC27XX_LEDS_PRESCALE 0x04
#define SC27XX_LEDS_DUTY 0x08
#define SC27XX_LEDS_CURVE0 0x0c
#define SC27XX_LEDS_CURVE1 0x10
#define SC27XX_CTRL_SHIFT 4
#define SC27XX_LED_RUN BIT(0)
#define SC27XX_LED_TYPE BIT(1)
#define SC27XX_DUTY_SHIFT 8
#define SC27XX_DUTY_MASK GENMASK(15, 0)
#define SC27XX_MOD_MASK GENMASK(7, 0)
#define SC27XX_CURVE_SHIFT 8
#define SC27XX_CURVE_L_MASK GENMASK(7, 0)
#define SC27XX_CURVE_H_MASK GENMASK(15, 8)
#define SC27XX_LEDS_OFFSET 0x10
#define SC27XX_LEDS_MAX 3
#define SC27XX_LEDS_PATTERN_CNT 4
/* Stage duration step, in milliseconds */
#define SC27XX_LEDS_STEP 125
/* Minimum and maximum duration, in milliseconds */
#define SC27XX_DELTA_T_MIN SC27XX_LEDS_STEP
#define SC27XX_DELTA_T_MAX (SC27XX_LEDS_STEP * 255)
struct sc27xx_led {
struct fwnode_handle *fwnode;
struct led_classdev ldev;
struct sc27xx_led_priv *priv;
u8 line;
bool active;
};
struct sc27xx_led_priv {
struct sc27xx_led leds[SC27XX_LEDS_MAX];
struct regmap *regmap;
struct mutex lock;
u32 base;
};
#define to_sc27xx_led(ldev) \
container_of(ldev, struct sc27xx_led, ldev)
static int sc27xx_led_init(struct regmap *regmap)
{
int err;
err = regmap_update_bits(regmap, SC27XX_MODULE_EN0, SC27XX_BLTC_EN,
SC27XX_BLTC_EN);
if (err)
return err;
err = regmap_update_bits(regmap, SC27XX_CLK_EN0, SC27XX_RTC_EN,
SC27XX_RTC_EN);
if (err)
return err;
return regmap_update_bits(regmap, SC27XX_RGB_CTRL, SC27XX_RGB_PD, 0);
}
static u32 sc27xx_led_get_offset(struct sc27xx_led *leds)
{
return leds->priv->base + SC27XX_LEDS_OFFSET * leds->line;
}
static int sc27xx_led_enable(struct sc27xx_led *leds, enum led_brightness value)
{
u32 base = sc27xx_led_get_offset(leds);
u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
struct regmap *regmap = leds->priv->regmap;
int err;
err = regmap_update_bits(regmap, base + SC27XX_LEDS_DUTY,
SC27XX_DUTY_MASK,
(value << SC27XX_DUTY_SHIFT) |
SC27XX_MOD_MASK);
if (err)
return err;
return regmap_update_bits(regmap, ctrl_base,
(SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift,
(SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift);
}
static int sc27xx_led_disable(struct sc27xx_led *leds)
{
struct regmap *regmap = leds->priv->regmap;
u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
return regmap_update_bits(regmap, ctrl_base,
(SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift, 0);
}
static int sc27xx_led_set(struct led_classdev *ldev, enum led_brightness value)
{
struct sc27xx_led *leds = to_sc27xx_led(ldev);
int err;
mutex_lock(&leds->priv->lock);
if (value == LED_OFF)
err = sc27xx_led_disable(leds);
else
err = sc27xx_led_enable(leds, value);
mutex_unlock(&leds->priv->lock);
return err;
}
static void sc27xx_led_clamp_align_delta_t(u32 *delta_t)
{
u32 v, offset, t = *delta_t;
v = t + SC27XX_LEDS_STEP / 2;
v = clamp_t(u32, v, SC27XX_DELTA_T_MIN, SC27XX_DELTA_T_MAX);
offset = v - SC27XX_DELTA_T_MIN;
offset = SC27XX_LEDS_STEP * (offset / SC27XX_LEDS_STEP);
*delta_t = SC27XX_DELTA_T_MIN + offset;
}
static int sc27xx_led_pattern_clear(struct led_classdev *ldev)
{
struct sc27xx_led *leds = to_sc27xx_led(ldev);
struct regmap *regmap = leds->priv->regmap;
u32 base = sc27xx_led_get_offset(leds);
u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
int err;
mutex_lock(&leds->priv->lock);
/* Reset the rise, high, fall and low time to zero. */
regmap_write(regmap, base + SC27XX_LEDS_CURVE0, 0);
regmap_write(regmap, base + SC27XX_LEDS_CURVE1, 0);
err = regmap_update_bits(regmap, ctrl_base,
(SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift, 0);
ldev->brightness = LED_OFF;
mutex_unlock(&leds->priv->lock);
return err;
}
static int sc27xx_led_pattern_set(struct led_classdev *ldev,
struct led_pattern *pattern,
u32 len, int repeat)
{
struct sc27xx_led *leds = to_sc27xx_led(ldev);
u32 base = sc27xx_led_get_offset(leds);
u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
struct regmap *regmap = leds->priv->regmap;
int err;
/*
* Must contain 4 tuples to configure the rise time, high time, fall
* time and low time to enable the breathing mode.
*/
if (len != SC27XX_LEDS_PATTERN_CNT)
return -EINVAL;
mutex_lock(&leds->priv->lock);
sc27xx_led_clamp_align_delta_t(&pattern[0].delta_t);
err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE0,
SC27XX_CURVE_L_MASK,
pattern[0].delta_t / SC27XX_LEDS_STEP);
if (err)
goto out;
sc27xx_led_clamp_align_delta_t(&pattern[1].delta_t);
err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE1,
SC27XX_CURVE_L_MASK,
pattern[1].delta_t / SC27XX_LEDS_STEP);
if (err)
goto out;
sc27xx_led_clamp_align_delta_t(&pattern[2].delta_t);
err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE0,
SC27XX_CURVE_H_MASK,
(pattern[2].delta_t / SC27XX_LEDS_STEP) <<
SC27XX_CURVE_SHIFT);
if (err)
goto out;
sc27xx_led_clamp_align_delta_t(&pattern[3].delta_t);
err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE1,
SC27XX_CURVE_H_MASK,
(pattern[3].delta_t / SC27XX_LEDS_STEP) <<
SC27XX_CURVE_SHIFT);
if (err)
goto out;
err = regmap_update_bits(regmap, base + SC27XX_LEDS_DUTY,
SC27XX_DUTY_MASK,
(pattern[1].brightness << SC27XX_DUTY_SHIFT) |
SC27XX_MOD_MASK);
if (err)
goto out;
/* Enable the LED breathing mode */
err = regmap_update_bits(regmap, ctrl_base,
SC27XX_LED_RUN << ctrl_shift,
SC27XX_LED_RUN << ctrl_shift);
if (!err)
ldev->brightness = pattern[1].brightness;
out:
mutex_unlock(&leds->priv->lock);
return err;
}
static int sc27xx_led_register(struct device *dev, struct sc27xx_led_priv *priv)
{
int i, err;
err = sc27xx_led_init(priv->regmap);
if (err)
return err;
for (i = 0; i < SC27XX_LEDS_MAX; i++) {
struct sc27xx_led *led = &priv->leds[i];
struct led_init_data init_data = {};
if (!led->active)
continue;
led->line = i;
led->priv = priv;
led->ldev.brightness_set_blocking = sc27xx_led_set;
led->ldev.pattern_set = sc27xx_led_pattern_set;
led->ldev.pattern_clear = sc27xx_led_pattern_clear;
led->ldev.default_trigger = "pattern";
init_data.fwnode = led->fwnode;
init_data.devicename = "sc27xx";
init_data.default_label = ":";
err = devm_led_classdev_register_ext(dev, &led->ldev,
&init_data);
if (err)
return err;
}
return 0;
}
static int sc27xx_led_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev_of_node(dev);
struct sc27xx_led_priv *priv;
u32 base, count, reg;
int err;
count = of_get_available_child_count(np);
if (!count || count > SC27XX_LEDS_MAX)
return -EINVAL;
err = of_property_read_u32(np, "reg", &base);
if (err) {
dev_err(dev, "fail to get reg of property\n");
return err;
}
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
priv->base = base;
priv->regmap = dev_get_regmap(dev->parent, NULL);
if (!priv->regmap) {
err = -ENODEV;
dev_err(dev, "failed to get regmap: %d\n", err);
return err;
}
for_each_available_child_of_node_scoped(np, child) {
err = of_property_read_u32(child, "reg", &reg);
if (err)
return err;
if (reg >= SC27XX_LEDS_MAX || priv->leds[reg].active)
return -EINVAL;
priv->leds[reg].fwnode = of_fwnode_handle(child);
priv->leds[reg].active = true;
}
mutex_init(&priv->lock);
err = sc27xx_led_register(dev, priv);
if (err)
mutex_destroy(&priv->lock);
return err;
}
static void sc27xx_led_remove(struct platform_device *pdev)
{
struct sc27xx_led_priv *priv = platform_get_drvdata(pdev);
mutex_destroy(&priv->lock);
}
static const struct of_device_id sc27xx_led_of_match[] = {
{ .compatible = "sprd,sc2731-bltc", },
{ }
};
MODULE_DEVICE_TABLE(of, sc27xx_led_of_match);
static struct platform_driver sc27xx_led_driver = {
.driver = {
.name = "sprd-bltc",
.of_match_table = sc27xx_led_of_match,
},
.probe = sc27xx_led_probe,
.remove = sc27xx_led_remove,
};
module_platform_driver(sc27xx_led_driver);
MODULE_DESCRIPTION("Spreadtrum SC27xx breathing light controller driver");
MODULE_AUTHOR("Xiaotong Lu <xiaotong.lu@spreadtrum.com>");
MODULE_AUTHOR("Baolin Wang <baolin.wang@linaro.org>");
MODULE_LICENSE("GPL v2");
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