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leds: cht-wcove: Add support for breathing mode use hw_pattern sysfs API

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The hw-blinking of the LED controller in the Whiskey Cove PMIC can also
be used for a hw-breathing effect.

As discussed during review of v2 of the submission of the new
leds-cht-wcove driver, the LED subsystem already supports breathing mode
on several other LED controllers using the hw_pattern interface.

Implement a pattern_set callback to implement breathing mode modelled
after the breathing mode supported by the SC27xx breathing light and
Crane EL15203000 LED drivers. The Whiskey Cove PMIC's breathing mode
is closer to the EL15203000 one then to the SC27xx one since it does
not support staying high / low for a specific time, it only supports
rise and fall times.

As such the supported hw_pattern and the documentation for this is almost
a 1:1 copy of the pattern/docs for the EL15203000 breathing mode.

Suggested-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Link: https://lore.kernel.org/all/6beed61c-1fc6-6525-e873-a8978f5fbffb@gmail.com/
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230430195952.862527-4-hdegoede@redhat.com
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Hans de Goede 2023-04-30 21:59:50 +02:00 committed by Lee Jones
parent 9697e2f01f
commit 5b916aa755
3 changed files with 77 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Documentation/leds/index.rst
View File

@ -17,6 +17,7 @@ LEDs
uleds
leds-blinkm
leds-cht-wcove
leds-el15203000
leds-lm3556
leds-lp3944

38
Documentation/leds/leds-cht-wcove.rst Normal file
View File

@ -0,0 +1,38 @@
.. SPDX-License-Identifier: GPL-2.0
===========================================================
Kernel driver for Intel Cherry Trail Whiskey Cove PMIC LEDs
===========================================================
/sys/class/leds/<led>/hw_pattern
--------------------------------
Specify a hardware pattern for the Whiskey Cove PMIC LEDs.
The only supported pattern is hardware breathing mode::
"0 2000 1 2000"
^
|
Max-| ---
| / \
| / \
| / \ /
| / \ /
Min-|- ---
|
0------2------4--> time (sec)
The rise and fall times must be the same value.
Supported values are 2000, 1000, 500 and 250 for
breathing frequencies of 1/4, 1/2, 1 and 2 Hz.
The set pattern only controls the timing. For max brightness the last
set brightness is used and the max brightness can be changed
while breathing by writing the brightness attribute.
This is just like how blinking works in the LED subsystem,
for both sw and hw blinking the brightness can also be changed
while blinking. Breathing on this hw really is just a variant
mode of blinking.

42
drivers/leds/leds-cht-wcove.c
View File

@ -217,9 +217,10 @@ static int cht_wc_leds_find_freq(unsigned long period)
return -1;
}
static int cht_wc_leds_blink_set(struct led_classdev *cdev,
unsigned long *delay_on,
unsigned long *delay_off)
static int cht_wc_leds_set_effect(struct led_classdev *cdev,
unsigned long *delay_on,
unsigned long *delay_off,
u8 effect)
{
struct cht_wc_led *led = container_of(cdev, struct cht_wc_led, cdev);
unsigned int ctrl;
@ -246,7 +247,7 @@ static int cht_wc_leds_blink_set(struct led_classdev *cdev,
}
ret = regmap_update_bits(led->regmap, led->regs->fsm,
CHT_WC_LED_EFF_MASK, CHT_WC_LED_EFF_BLINKING);
CHT_WC_LED_EFF_MASK, effect);
if (ret < 0)
dev_err(cdev->dev, "Failed to update LED FSM reg: %d\n", ret);
@ -265,6 +266,37 @@ static int cht_wc_leds_blink_set(struct led_classdev *cdev,
return ret;
}
static int cht_wc_leds_blink_set(struct led_classdev *cdev,
unsigned long *delay_on,
unsigned long *delay_off)
{
return cht_wc_leds_set_effect(cdev, delay_on, delay_off, CHT_WC_LED_EFF_BLINKING);
}
static int cht_wc_leds_pattern_set(struct led_classdev *cdev,
struct led_pattern *pattern,
u32 len, int repeat)
{
unsigned long delay_off, delay_on;
if (repeat > 0 || len != 2 ||
pattern[0].brightness != 0 || pattern[1].brightness != 1 ||
pattern[0].delta_t != pattern[1].delta_t ||
(pattern[0].delta_t != 250 && pattern[0].delta_t != 500 &&
pattern[0].delta_t != 1000 && pattern[0].delta_t != 2000))
return -EINVAL;
delay_off = pattern[0].delta_t;
delay_on = pattern[1].delta_t;
return cht_wc_leds_set_effect(cdev, &delay_on, &delay_off, CHT_WC_LED_EFF_BREATHING);
}
static int cht_wc_leds_pattern_clear(struct led_classdev *cdev)
{
return cht_wc_leds_brightness_set(cdev, 0);
}
static int cht_wc_led_save_regs(struct cht_wc_led *led,
struct cht_wc_led_saved_regs *saved_regs)
{
@ -329,6 +361,8 @@ static int cht_wc_leds_probe(struct platform_device *pdev)
led->cdev.brightness_set_blocking = cht_wc_leds_brightness_set;
led->cdev.brightness_get = cht_wc_leds_brightness_get;
led->cdev.blink_set = cht_wc_leds_blink_set;
led->cdev.pattern_set = cht_wc_leds_pattern_set;
led->cdev.pattern_clear = cht_wc_leds_pattern_clear;
led->cdev.max_brightness = 255;
ret = led_classdev_register(&pdev->dev, &led->cdev);