linux/drivers/leds/leds-mt6323.c

494 lines
12 KiB
C
Raw Normal View History

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 Based on 3 normalized pattern(s): 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 either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details 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 either version 2 of the license or at your option any later version [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details 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 either version 2 of the license or at your option any later version [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-27 14:55:06 +08:00
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* LED driver for Mediatek MT6323 PMIC
*
* Copyright (C) 2017 Sean Wang <sean.wang@mediatek.com>
*/
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/mfd/mt6323/registers.h>
#include <linux/mfd/mt6397/core.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
/*
* Register field for MT6323_TOP_CKPDN0 to enable
* 32K clock common for LED device.
*/
#define MT6323_RG_DRV_32K_CK_PDN BIT(11)
#define MT6323_RG_DRV_32K_CK_PDN_MASK BIT(11)
/*
* Register field for MT6323_TOP_CKPDN2 to enable
* individual clock for LED device.
*/
#define MT6323_RG_ISINK_CK_PDN(i) BIT(i)
#define MT6323_RG_ISINK_CK_PDN_MASK(i) BIT(i)
/*
* Register field for MT6323_TOP_CKCON1 to select
* clock source.
*/
#define MT6323_RG_ISINK_CK_SEL_MASK(i) (BIT(10) << (i))
/*
* Register for MT6323_ISINK_CON0 to setup the
* duty cycle of the blink.
*/
#define MT6323_ISINK_CON0(i) (MT6323_ISINK0_CON0 + 0x8 * (i))
#define MT6323_ISINK_DIM_DUTY_MASK (0x1f << 8)
#define MT6323_ISINK_DIM_DUTY(i) (((i) << 8) & \
MT6323_ISINK_DIM_DUTY_MASK)
/* Register to setup the period of the blink. */
#define MT6323_ISINK_CON1(i) (MT6323_ISINK0_CON1 + 0x8 * (i))
#define MT6323_ISINK_DIM_FSEL_MASK (0xffff)
#define MT6323_ISINK_DIM_FSEL(i) ((i) & MT6323_ISINK_DIM_FSEL_MASK)
/* Register to control the brightness. */
#define MT6323_ISINK_CON2(i) (MT6323_ISINK0_CON2 + 0x8 * (i))
#define MT6323_ISINK_CH_STEP_SHIFT 12
#define MT6323_ISINK_CH_STEP_MASK (0x7 << 12)
#define MT6323_ISINK_CH_STEP(i) (((i) << 12) & \
MT6323_ISINK_CH_STEP_MASK)
#define MT6323_ISINK_SFSTR0_TC_MASK (0x3 << 1)
#define MT6323_ISINK_SFSTR0_TC(i) (((i) << 1) & \
MT6323_ISINK_SFSTR0_TC_MASK)
#define MT6323_ISINK_SFSTR0_EN_MASK BIT(0)
#define MT6323_ISINK_SFSTR0_EN BIT(0)
/* Register to LED channel enablement. */
#define MT6323_ISINK_CH_EN_MASK(i) BIT(i)
#define MT6323_ISINK_CH_EN(i) BIT(i)
#define MT6323_MAX_PERIOD 10000
#define MT6323_MAX_LEDS 4
#define MT6323_MAX_BRIGHTNESS 6
#define MT6323_UNIT_DUTY 3125
#define MT6323_CAL_HW_DUTY(o, p) DIV_ROUND_CLOSEST((o) * 100000ul,\
(p) * MT6323_UNIT_DUTY)
struct mt6323_leds;
/**
* struct mt6323_led - state container for the LED device
* @id: the identifier in MT6323 LED device
* @parent: the pointer to MT6323 LED controller
* @cdev: LED class device for this LED device
* @current_brightness: current state of the LED device
*/
struct mt6323_led {
int id;
struct mt6323_leds *parent;
struct led_classdev cdev;
enum led_brightness current_brightness;
};
/**
* struct mt6323_leds - state container for holding LED controller
* of the driver
* @dev: the device pointer
* @hw: the underlying hardware providing shared
* bus for the register operations
* @lock: the lock among process context
* @led: the array that contains the state of individual
* LED device
*/
struct mt6323_leds {
struct device *dev;
struct mt6397_chip *hw;
/* protect among process context */
struct mutex lock;
struct mt6323_led *led[MT6323_MAX_LEDS];
};
static int mt6323_led_hw_brightness(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
struct mt6323_leds *leds = led->parent;
struct regmap *regmap = leds->hw->regmap;
u32 con2_mask = 0, con2_val = 0;
int ret;
/*
* Setup current output for the corresponding
* brightness level.
*/
con2_mask |= MT6323_ISINK_CH_STEP_MASK |
MT6323_ISINK_SFSTR0_TC_MASK |
MT6323_ISINK_SFSTR0_EN_MASK;
con2_val |= MT6323_ISINK_CH_STEP(brightness - 1) |
MT6323_ISINK_SFSTR0_TC(2) |
MT6323_ISINK_SFSTR0_EN;
ret = regmap_update_bits(regmap, MT6323_ISINK_CON2(led->id),
con2_mask, con2_val);
return ret;
}
static int mt6323_led_hw_off(struct led_classdev *cdev)
{
struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
struct mt6323_leds *leds = led->parent;
struct regmap *regmap = leds->hw->regmap;
unsigned int status;
int ret;
status = MT6323_ISINK_CH_EN(led->id);
ret = regmap_update_bits(regmap, MT6323_ISINK_EN_CTRL,
MT6323_ISINK_CH_EN_MASK(led->id), ~status);
if (ret < 0)
return ret;
usleep_range(100, 300);
ret = regmap_update_bits(regmap, MT6323_TOP_CKPDN2,
MT6323_RG_ISINK_CK_PDN_MASK(led->id),
MT6323_RG_ISINK_CK_PDN(led->id));
if (ret < 0)
return ret;
return 0;
}
static enum led_brightness
mt6323_get_led_hw_brightness(struct led_classdev *cdev)
{
struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
struct mt6323_leds *leds = led->parent;
struct regmap *regmap = leds->hw->regmap;
unsigned int status;
int ret;
ret = regmap_read(regmap, MT6323_TOP_CKPDN2, &status);
if (ret < 0)
return ret;
if (status & MT6323_RG_ISINK_CK_PDN_MASK(led->id))
return 0;
ret = regmap_read(regmap, MT6323_ISINK_EN_CTRL, &status);
if (ret < 0)
return ret;
if (!(status & MT6323_ISINK_CH_EN(led->id)))
return 0;
ret = regmap_read(regmap, MT6323_ISINK_CON2(led->id), &status);
if (ret < 0)
return ret;
return ((status & MT6323_ISINK_CH_STEP_MASK)
>> MT6323_ISINK_CH_STEP_SHIFT) + 1;
}
static int mt6323_led_hw_on(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
struct mt6323_leds *leds = led->parent;
struct regmap *regmap = leds->hw->regmap;
unsigned int status;
int ret;
/*
* Setup required clock source, enable the corresponding
* clock and channel and let work with continuous blink as
* the default.
*/
ret = regmap_update_bits(regmap, MT6323_TOP_CKCON1,
MT6323_RG_ISINK_CK_SEL_MASK(led->id), 0);
if (ret < 0)
return ret;
status = MT6323_RG_ISINK_CK_PDN(led->id);
ret = regmap_update_bits(regmap, MT6323_TOP_CKPDN2,
MT6323_RG_ISINK_CK_PDN_MASK(led->id),
~status);
if (ret < 0)
return ret;
usleep_range(100, 300);
ret = regmap_update_bits(regmap, MT6323_ISINK_EN_CTRL,
MT6323_ISINK_CH_EN_MASK(led->id),
MT6323_ISINK_CH_EN(led->id));
if (ret < 0)
return ret;
ret = mt6323_led_hw_brightness(cdev, brightness);
if (ret < 0)
return ret;
ret = regmap_update_bits(regmap, MT6323_ISINK_CON0(led->id),
MT6323_ISINK_DIM_DUTY_MASK,
MT6323_ISINK_DIM_DUTY(31));
if (ret < 0)
return ret;
ret = regmap_update_bits(regmap, MT6323_ISINK_CON1(led->id),
MT6323_ISINK_DIM_FSEL_MASK,
MT6323_ISINK_DIM_FSEL(1000));
if (ret < 0)
return ret;
return 0;
}
static int mt6323_led_set_blink(struct led_classdev *cdev,
unsigned long *delay_on,
unsigned long *delay_off)
{
struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
struct mt6323_leds *leds = led->parent;
struct regmap *regmap = leds->hw->regmap;
unsigned long period;
u8 duty_hw;
int ret;
/*
* Units are in ms, if over the hardware able
* to support, fallback into software blink
*/
period = *delay_on + *delay_off;
if (period > MT6323_MAX_PERIOD)
return -EINVAL;
/*
* LED subsystem requires a default user
* friendly blink pattern for the LED so using
* 1Hz duty cycle 50% here if without specific
* value delay_on and delay off being assigned.
*/
if (!*delay_on && !*delay_off) {
*delay_on = 500;
*delay_off = 500;
}
/*
* Calculate duty_hw based on the percentage of period during
* which the led is ON.
*/
duty_hw = MT6323_CAL_HW_DUTY(*delay_on, period);
/* hardware doesn't support zero duty cycle. */
if (!duty_hw)
return -EINVAL;
mutex_lock(&leds->lock);
/*
* Set max_brightness as the software blink behavior
* when no blink brightness.
*/
if (!led->current_brightness) {
ret = mt6323_led_hw_on(cdev, cdev->max_brightness);
if (ret < 0)
goto out;
led->current_brightness = cdev->max_brightness;
}
ret = regmap_update_bits(regmap, MT6323_ISINK_CON0(led->id),
MT6323_ISINK_DIM_DUTY_MASK,
MT6323_ISINK_DIM_DUTY(duty_hw - 1));
if (ret < 0)
goto out;
ret = regmap_update_bits(regmap, MT6323_ISINK_CON1(led->id),
MT6323_ISINK_DIM_FSEL_MASK,
MT6323_ISINK_DIM_FSEL(period - 1));
out:
mutex_unlock(&leds->lock);
return ret;
}
static int mt6323_led_set_brightness(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
struct mt6323_leds *leds = led->parent;
int ret;
mutex_lock(&leds->lock);
if (!led->current_brightness && brightness) {
ret = mt6323_led_hw_on(cdev, brightness);
if (ret < 0)
goto out;
} else if (brightness) {
ret = mt6323_led_hw_brightness(cdev, brightness);
if (ret < 0)
goto out;
} else {
ret = mt6323_led_hw_off(cdev);
if (ret < 0)
goto out;
}
led->current_brightness = brightness;
out:
mutex_unlock(&leds->lock);
return ret;
}
static int mt6323_led_set_dt_default(struct led_classdev *cdev,
struct device_node *np)
{
struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
const char *state;
int ret = 0;
led->cdev.name = of_get_property(np, "label", NULL) ? : np->name;
led->cdev.default_trigger = of_get_property(np,
"linux,default-trigger",
NULL);
state = of_get_property(np, "default-state", NULL);
if (state) {
if (!strcmp(state, "keep")) {
ret = mt6323_get_led_hw_brightness(cdev);
if (ret < 0)
return ret;
led->current_brightness = ret;
ret = 0;
} else if (!strcmp(state, "on")) {
ret =
mt6323_led_set_brightness(cdev, cdev->max_brightness);
} else {
ret = mt6323_led_set_brightness(cdev, LED_OFF);
}
}
return ret;
}
static int mt6323_led_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = pdev->dev.of_node;
struct device_node *child;
struct mt6397_chip *hw = dev_get_drvdata(pdev->dev.parent);
struct mt6323_leds *leds;
struct mt6323_led *led;
int ret;
unsigned int status;
u32 reg;
leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
if (!leds)
return -ENOMEM;
platform_set_drvdata(pdev, leds);
leds->dev = dev;
/*
* leds->hw points to the underlying bus for the register
* controlled.
*/
leds->hw = hw;
mutex_init(&leds->lock);
status = MT6323_RG_DRV_32K_CK_PDN;
ret = regmap_update_bits(leds->hw->regmap, MT6323_TOP_CKPDN0,
MT6323_RG_DRV_32K_CK_PDN_MASK, ~status);
if (ret < 0) {
dev_err(leds->dev,
"Failed to update MT6323_TOP_CKPDN0 Register\n");
return ret;
}
for_each_available_child_of_node(np, child) {
ret = of_property_read_u32(child, "reg", &reg);
if (ret) {
dev_err(dev, "Failed to read led 'reg' property\n");
goto put_child_node;
}
if (reg >= MT6323_MAX_LEDS || leds->led[reg]) {
dev_err(dev, "Invalid led reg %u\n", reg);
ret = -EINVAL;
goto put_child_node;
}
led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
if (!led) {
ret = -ENOMEM;
goto put_child_node;
}
leds->led[reg] = led;
leds->led[reg]->id = reg;
leds->led[reg]->cdev.max_brightness = MT6323_MAX_BRIGHTNESS;
leds->led[reg]->cdev.brightness_set_blocking =
mt6323_led_set_brightness;
leds->led[reg]->cdev.blink_set = mt6323_led_set_blink;
leds->led[reg]->cdev.brightness_get =
mt6323_get_led_hw_brightness;
leds->led[reg]->parent = leds;
ret = mt6323_led_set_dt_default(&leds->led[reg]->cdev, child);
if (ret < 0) {
dev_err(leds->dev,
"Failed to LED set default from devicetree\n");
goto put_child_node;
}
ret = devm_led_classdev_register(dev, &leds->led[reg]->cdev);
if (ret) {
dev_err(&pdev->dev, "Failed to register LED: %d\n",
ret);
goto put_child_node;
}
leds->led[reg]->cdev.dev->of_node = child;
}
return 0;
put_child_node:
of_node_put(child);
return ret;
}
static int mt6323_led_remove(struct platform_device *pdev)
{
struct mt6323_leds *leds = platform_get_drvdata(pdev);
int i;
/* Turn the LEDs off on driver removal. */
for (i = 0 ; leds->led[i] ; i++)
mt6323_led_hw_off(&leds->led[i]->cdev);
regmap_update_bits(leds->hw->regmap, MT6323_TOP_CKPDN0,
MT6323_RG_DRV_32K_CK_PDN_MASK,
MT6323_RG_DRV_32K_CK_PDN);
mutex_destroy(&leds->lock);
return 0;
}
static const struct of_device_id mt6323_led_dt_match[] = {
{ .compatible = "mediatek,mt6323-led" },
{},
};
MODULE_DEVICE_TABLE(of, mt6323_led_dt_match);
static struct platform_driver mt6323_led_driver = {
.probe = mt6323_led_probe,
.remove = mt6323_led_remove,
.driver = {
.name = "mt6323-led",
.of_match_table = mt6323_led_dt_match,
},
};
module_platform_driver(mt6323_led_driver);
MODULE_DESCRIPTION("LED driver for Mediatek MT6323 PMIC");
MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
MODULE_LICENSE("GPL");