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authorLinus Torvalds <torvalds@linux-foundation.org>2024-03-14 20:35:46 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2024-03-14 20:35:46 +0300
commitf3d8f29d1f59230b8c2a09e6dee7db7bd295e42c (patch)
tree5e29c74b69d09d92fc5365e0fc18675d0553b9aa /drivers/leds
parent8403ce70be339d462892a2b935ae30ee52416f92 (diff)
parentb49c1caca529c28712ef62bfaabdb9441162a935 (diff)
downloadlinux-f3d8f29d1f59230b8c2a09e6dee7db7bd295e42c.tar.xz
Merge tag 'backlight-next-6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight
Pull backlight updates from Lee Jones: "New Drivers: - Add support for Kinetic KTD2801 Backlight Fix-ups: - Fix include lists; alphabetise, remove unused, explicitly add used - Device Tree binding adaptions/conversions/creation - Use dev_err_probe() to clean-up error paths - Use/convert to new/better APIs/helpers/MACROs instead of hand-rolling implementations Bug Fixes: - Fix changes of NULL pointer dereference - Remedy a bunch of logic errors - Initialise (zero) Backlight properties data structures" * tag 'backlight-next-6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight: (32 commits) backlight: pandora_bl: Drop unneeded ENOMEM error message backlight: lm3630a_bl: Simplify probe return on gpio request error backlight: lm3630a_bl: Handle deferred probe backlight: as3711_bl: Handle deferred probe backlight: bd6107: Handle deferred probe backlight: l4f00242t03: Simplify with dev_err_probe() backlight: gpio: Simplify with dev_err_probe() backlight: lp8788: Fully initialize backlight_properties during probe backlight: lm3639: Fully initialize backlight_properties during probe backlight: da9052: Fully initialize backlight_properties during probe backlight: lm3630a: Use backlight_get_brightness helper in update_status backlight: lm3630a: Don't set bl->props.brightness in get_brightness backlight: lm3630a: Initialize backlight_properties on init backlight: mp3309c: Fully initialize backlight_properties during probe backlight: mp3309c: Utilise temporary variable for struct device backlight: mp3309c: Use dev_err_probe() instead of dev_err() backlight: mp3309c: Make use of device properties dt-bindings: backlight: qcom-wled: Fix bouncing email addresses backlight: hx8357: Utilise temporary variable for struct device backlight: hx8357: Make use of dev_err_probe() ...
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/Kconfig4
-rw-r--r--drivers/leds/Makefile3
-rw-r--r--drivers/leds/flash/Kconfig3
-rw-r--r--drivers/leds/flash/leds-ktd2692.c116
-rw-r--r--drivers/leds/leds-expresswire.c72
5 files changed, 108 insertions, 90 deletions
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index d721b254e1e4..64bb2de237e9 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -186,6 +186,10 @@ config LEDS_EL15203000
To compile this driver as a module, choose M here: the module
will be called leds-el15203000.
+config LEDS_EXPRESSWIRE
+ bool
+ depends on GPIOLIB
+
config LEDS_TURRIS_OMNIA
tristate "LED support for CZ.NIC's Turris Omnia"
depends on LEDS_CLASS_MULTICOLOR
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index ce07dc295ff0..effdfc6f1e95 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -91,6 +91,9 @@ obj-$(CONFIG_LEDS_WM831X_STATUS) += leds-wm831x-status.o
obj-$(CONFIG_LEDS_WM8350) += leds-wm8350.o
obj-$(CONFIG_LEDS_WRAP) += leds-wrap.o
+# Kinetic ExpressWire Protocol
+obj-$(CONFIG_LEDS_EXPRESSWIRE) += leds-expresswire.o
+
# LED SPI Drivers
obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o
obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
diff --git a/drivers/leds/flash/Kconfig b/drivers/leds/flash/Kconfig
index 4e08dbc05709..24722d581369 100644
--- a/drivers/leds/flash/Kconfig
+++ b/drivers/leds/flash/Kconfig
@@ -23,7 +23,8 @@ config LEDS_AS3645A
config LEDS_KTD2692
tristate "LED support for Kinetic KTD2692 flash LED controller"
depends on OF
- depends on GPIOLIB || COMPILE_TEST
+ depends on GPIOLIB
+ select LEDS_EXPRESSWIRE
help
This option enables support for Kinetic KTD2692 LED flash connected
through ExpressWire interface.
diff --git a/drivers/leds/flash/leds-ktd2692.c b/drivers/leds/flash/leds-ktd2692.c
index 598eee5daa52..7bb0aa2753e3 100644
--- a/drivers/leds/flash/leds-ktd2692.c
+++ b/drivers/leds/flash/leds-ktd2692.c
@@ -6,9 +6,9 @@
* Ingi Kim <ingi2.kim@samsung.com>
*/
-#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
+#include <linux/leds-expresswire.h>
#include <linux/led-class-flash.h>
#include <linux/module.h>
#include <linux/mutex.h>
@@ -37,22 +37,9 @@
#define KTD2692_REG_FLASH_CURRENT_BASE 0x80
#define KTD2692_REG_MODE_BASE 0xA0
-/* Set bit coding time for expresswire interface */
-#define KTD2692_TIME_RESET_US 700
-#define KTD2692_TIME_DATA_START_TIME_US 10
-#define KTD2692_TIME_HIGH_END_OF_DATA_US 350
-#define KTD2692_TIME_LOW_END_OF_DATA_US 10
-#define KTD2692_TIME_SHORT_BITSET_US 4
-#define KTD2692_TIME_LONG_BITSET_US 12
-
/* KTD2692 default length of name */
#define KTD2692_NAME_LENGTH 20
-enum ktd2692_bitset {
- KTD2692_LOW = 0,
- KTD2692_HIGH,
-};
-
/* Movie / Flash Mode Control */
enum ktd2692_led_mode {
KTD2692_MODE_DISABLE = 0, /* default */
@@ -71,7 +58,19 @@ struct ktd2692_led_config_data {
enum led_brightness max_brightness;
};
+const struct expresswire_timing ktd2692_timing = {
+ .poweroff_us = 700,
+ .data_start_us = 10,
+ .end_of_data_low_us = 10,
+ .end_of_data_high_us = 350,
+ .short_bitset_us = 4,
+ .long_bitset_us = 12
+};
+
struct ktd2692_context {
+ /* Common ExpressWire properties (ctrl GPIO and timing) */
+ struct expresswire_common_props props;
+
/* Related LED Flash class device */
struct led_classdev_flash fled_cdev;
@@ -80,7 +79,6 @@ struct ktd2692_context {
struct regulator *regulator;
struct gpio_desc *aux_gpio;
- struct gpio_desc *ctrl_gpio;
enum ktd2692_led_mode mode;
enum led_brightness torch_brightness;
@@ -92,67 +90,6 @@ static struct ktd2692_context *fled_cdev_to_led(
return container_of(fled_cdev, struct ktd2692_context, fled_cdev);
}
-static void ktd2692_expresswire_start(struct ktd2692_context *led)
-{
- gpiod_direction_output(led->ctrl_gpio, KTD2692_HIGH);
- udelay(KTD2692_TIME_DATA_START_TIME_US);
-}
-
-static void ktd2692_expresswire_reset(struct ktd2692_context *led)
-{
- gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);
- udelay(KTD2692_TIME_RESET_US);
-}
-
-static void ktd2692_expresswire_end(struct ktd2692_context *led)
-{
- gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);
- udelay(KTD2692_TIME_LOW_END_OF_DATA_US);
- gpiod_direction_output(led->ctrl_gpio, KTD2692_HIGH);
- udelay(KTD2692_TIME_HIGH_END_OF_DATA_US);
-}
-
-static void ktd2692_expresswire_set_bit(struct ktd2692_context *led, bool bit)
-{
- /*
- * The Low Bit(0) and High Bit(1) is based on a time detection
- * algorithm between time low and time high
- * Time_(L_LB) : Low time of the Low Bit(0)
- * Time_(H_LB) : High time of the LOW Bit(0)
- * Time_(L_HB) : Low time of the High Bit(1)
- * Time_(H_HB) : High time of the High Bit(1)
- *
- * It can be simplified to:
- * Low Bit(0) : 2 * Time_(H_LB) < Time_(L_LB)
- * High Bit(1) : 2 * Time_(L_HB) < Time_(H_HB)
- * HIGH ___ ____ _.. _________ ___
- * |_________| |_.. |____| |__|
- * LOW <L_LB> <H_LB> <L_HB> <H_HB>
- * [ Low Bit (0) ] [ High Bit(1) ]
- */
- if (bit) {
- gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);
- udelay(KTD2692_TIME_SHORT_BITSET_US);
- gpiod_direction_output(led->ctrl_gpio, KTD2692_HIGH);
- udelay(KTD2692_TIME_LONG_BITSET_US);
- } else {
- gpiod_direction_output(led->ctrl_gpio, KTD2692_LOW);
- udelay(KTD2692_TIME_LONG_BITSET_US);
- gpiod_direction_output(led->ctrl_gpio, KTD2692_HIGH);
- udelay(KTD2692_TIME_SHORT_BITSET_US);
- }
-}
-
-static void ktd2692_expresswire_write(struct ktd2692_context *led, u8 value)
-{
- int i;
-
- ktd2692_expresswire_start(led);
- for (i = 7; i >= 0; i--)
- ktd2692_expresswire_set_bit(led, value & BIT(i));
- ktd2692_expresswire_end(led);
-}
-
static int ktd2692_led_brightness_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
@@ -163,14 +100,14 @@ static int ktd2692_led_brightness_set(struct led_classdev *led_cdev,
if (brightness == LED_OFF) {
led->mode = KTD2692_MODE_DISABLE;
- gpiod_direction_output(led->aux_gpio, KTD2692_LOW);
+ gpiod_direction_output(led->aux_gpio, 0);
} else {
- ktd2692_expresswire_write(led, brightness |
+ expresswire_write_u8(&led->props, brightness |
KTD2692_REG_MOVIE_CURRENT_BASE);
led->mode = KTD2692_MODE_MOVIE;
}
- ktd2692_expresswire_write(led, led->mode | KTD2692_REG_MODE_BASE);
+ expresswire_write_u8(&led->props, led->mode | KTD2692_REG_MODE_BASE);
mutex_unlock(&led->lock);
return 0;
@@ -187,17 +124,17 @@ static int ktd2692_led_flash_strobe_set(struct led_classdev_flash *fled_cdev,
if (state) {
flash_tm_reg = GET_TIMEOUT_OFFSET(timeout->val, timeout->step);
- ktd2692_expresswire_write(led, flash_tm_reg
+ expresswire_write_u8(&led->props, flash_tm_reg
| KTD2692_REG_FLASH_TIMEOUT_BASE);
led->mode = KTD2692_MODE_FLASH;
- gpiod_direction_output(led->aux_gpio, KTD2692_HIGH);
+ gpiod_direction_output(led->aux_gpio, 1);
} else {
led->mode = KTD2692_MODE_DISABLE;
- gpiod_direction_output(led->aux_gpio, KTD2692_LOW);
+ gpiod_direction_output(led->aux_gpio, 0);
}
- ktd2692_expresswire_write(led, led->mode | KTD2692_REG_MODE_BASE);
+ expresswire_write_u8(&led->props, led->mode | KTD2692_REG_MODE_BASE);
fled_cdev->led_cdev.brightness = LED_OFF;
led->mode = KTD2692_MODE_DISABLE;
@@ -247,12 +184,12 @@ static void ktd2692_init_flash_timeout(struct led_classdev_flash *fled_cdev,
static void ktd2692_setup(struct ktd2692_context *led)
{
led->mode = KTD2692_MODE_DISABLE;
- ktd2692_expresswire_reset(led);
- gpiod_direction_output(led->aux_gpio, KTD2692_LOW);
+ expresswire_power_off(&led->props);
+ gpiod_direction_output(led->aux_gpio, 0);
- ktd2692_expresswire_write(led, (KTD2692_MM_MIN_CURR_THRESHOLD_SCALE - 1)
+ expresswire_write_u8(&led->props, (KTD2692_MM_MIN_CURR_THRESHOLD_SCALE - 1)
| KTD2692_REG_MM_MIN_CURR_THRESHOLD_BASE);
- ktd2692_expresswire_write(led, KTD2692_FLASH_MODE_CURR_PERCENT(45)
+ expresswire_write_u8(&led->props, KTD2692_FLASH_MODE_CURR_PERCENT(45)
| KTD2692_REG_FLASH_CURRENT_BASE);
}
@@ -277,8 +214,8 @@ static int ktd2692_parse_dt(struct ktd2692_context *led, struct device *dev,
if (!np)
return -ENXIO;
- led->ctrl_gpio = devm_gpiod_get(dev, "ctrl", GPIOD_ASIS);
- ret = PTR_ERR_OR_ZERO(led->ctrl_gpio);
+ led->props.ctrl_gpio = devm_gpiod_get(dev, "ctrl", GPIOD_ASIS);
+ ret = PTR_ERR_OR_ZERO(led->props.ctrl_gpio);
if (ret)
return dev_err_probe(dev, ret, "cannot get ctrl-gpios\n");
@@ -412,6 +349,7 @@ static struct platform_driver ktd2692_driver = {
module_platform_driver(ktd2692_driver);
+MODULE_IMPORT_NS(EXPRESSWIRE);
MODULE_AUTHOR("Ingi Kim <ingi2.kim@samsung.com>");
MODULE_DESCRIPTION("Kinetic KTD2692 LED driver");
MODULE_LICENSE("GPL v2");
diff --git a/drivers/leds/leds-expresswire.c b/drivers/leds/leds-expresswire.c
new file mode 100644
index 000000000000..e4937a8e0f44
--- /dev/null
+++ b/drivers/leds/leds-expresswire.c
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Shared library for Kinetic's ExpressWire protocol.
+ * This protocol works by pulsing the ExpressWire IC's control GPIO.
+ * ktd2692 and ktd2801 are known to use this protocol.
+ */
+
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/export.h>
+#include <linux/gpio/consumer.h>
+#include <linux/types.h>
+
+#include <linux/leds-expresswire.h>
+
+void expresswire_power_off(struct expresswire_common_props *props)
+{
+ gpiod_set_value_cansleep(props->ctrl_gpio, 0);
+ usleep_range(props->timing.poweroff_us, props->timing.poweroff_us * 2);
+}
+EXPORT_SYMBOL_NS_GPL(expresswire_power_off, EXPRESSWIRE);
+
+void expresswire_enable(struct expresswire_common_props *props)
+{
+ gpiod_set_value(props->ctrl_gpio, 1);
+ udelay(props->timing.detect_delay_us);
+ gpiod_set_value(props->ctrl_gpio, 0);
+ udelay(props->timing.detect_us);
+ gpiod_set_value(props->ctrl_gpio, 1);
+}
+EXPORT_SYMBOL_NS_GPL(expresswire_enable, EXPRESSWIRE);
+
+void expresswire_start(struct expresswire_common_props *props)
+{
+ gpiod_set_value(props->ctrl_gpio, 1);
+ udelay(props->timing.data_start_us);
+}
+EXPORT_SYMBOL_NS_GPL(expresswire_start, EXPRESSWIRE);
+
+void expresswire_end(struct expresswire_common_props *props)
+{
+ gpiod_set_value(props->ctrl_gpio, 0);
+ udelay(props->timing.end_of_data_low_us);
+ gpiod_set_value(props->ctrl_gpio, 1);
+ udelay(props->timing.end_of_data_high_us);
+}
+EXPORT_SYMBOL_NS_GPL(expresswire_end, EXPRESSWIRE);
+
+void expresswire_set_bit(struct expresswire_common_props *props, bool bit)
+{
+ if (bit) {
+ gpiod_set_value(props->ctrl_gpio, 0);
+ udelay(props->timing.short_bitset_us);
+ gpiod_set_value(props->ctrl_gpio, 1);
+ udelay(props->timing.long_bitset_us);
+ } else {
+ gpiod_set_value(props->ctrl_gpio, 0);
+ udelay(props->timing.long_bitset_us);
+ gpiod_set_value(props->ctrl_gpio, 1);
+ udelay(props->timing.short_bitset_us);
+ }
+}
+EXPORT_SYMBOL_NS_GPL(expresswire_set_bit, EXPRESSWIRE);
+
+void expresswire_write_u8(struct expresswire_common_props *props, u8 val)
+{
+ expresswire_start(props);
+ for (int i = 7; i >= 0; i--)
+ expresswire_set_bit(props, val & BIT(i));
+ expresswire_end(props);
+}
+EXPORT_SYMBOL_NS_GPL(expresswire_write_u8, EXPRESSWIRE);