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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
leds: add PM8058 LEDs driver
This adds a driver for the six PM8058 LEDs, three ordinary LEDs,
two "flash" LEDs and one "keypad" LED.
The "keypad" and "flash" LEDs are not really hard-wired to these
usecases: for example on the APQ8060 Dragonboard, the "keypad"
LED is instead used to drive an IR LED used for the proximity
sensor. The "flash" LEDs are just ordinary high-current LED
drivers.
Cc: linux-arm-msm@vger.kernel.org
Cc: Andy Gross <andy.gross@linaro.org>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
authored by
Linus Walleij
and committed by
Jacek Anaszewski
7f866986
9a6b1f60
+200
+8
drivers/leds/Kconfig
+8
drivers/leds/Kconfig
···
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This option enabled support for the LEDs on the ARM Versatile
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and RealView boards. Say Y to enabled these.
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config LEDS_PM8058
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tristate "LED Support for the Qualcomm PM8058 PMIC"
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depends on MFD_PM8921_CORE
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depends on LEDS_CLASS
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help
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Choose this option if you want to use the LED drivers in
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the Qualcomm PM8058 PMIC.
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comment "LED Triggers"
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source "drivers/leds/trigger/Kconfig"
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+1
drivers/leds/Makefile
+1
drivers/leds/Makefile
+191
drivers/leds/leds-pm8058.c
+191
drivers/leds/leds-pm8058.c
···
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/* Copyright (c) 2010, 2011, 2016 The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/regmap.h>
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#define PM8058_LED_TYPE_COMMON 0x00
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#define PM8058_LED_TYPE_KEYPAD 0x01
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#define PM8058_LED_TYPE_FLASH 0x02
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+
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#define PM8058_LED_TYPE_COMMON_MASK 0xf8
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#define PM8058_LED_TYPE_KEYPAD_MASK 0xf0
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#define PM8058_LED_TYPE_COMMON_SHIFT 3
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#define PM8058_LED_TYPE_KEYPAD_SHIFT 4
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struct pm8058_led {
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struct regmap *map;
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u32 reg;
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u32 ledtype;
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struct led_classdev cdev;
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};
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static void pm8058_led_set(struct led_classdev *cled,
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enum led_brightness value)
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{
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struct pm8058_led *led;
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int ret = 0;
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unsigned int mask = 0;
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unsigned int val = 0;
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led = container_of(cled, struct pm8058_led, cdev);
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switch (led->ledtype) {
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case PM8058_LED_TYPE_COMMON:
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mask = PM8058_LED_TYPE_COMMON_MASK;
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val = value << PM8058_LED_TYPE_COMMON_SHIFT;
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break;
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case PM8058_LED_TYPE_KEYPAD:
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case PM8058_LED_TYPE_FLASH:
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mask = PM8058_LED_TYPE_KEYPAD_MASK;
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val = value << PM8058_LED_TYPE_KEYPAD_SHIFT;
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break;
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default:
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break;
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}
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ret = regmap_update_bits(led->map, led->reg, mask, val);
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if (ret)
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pr_err("Failed to set LED brightness\n");
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}
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static enum led_brightness pm8058_led_get(struct led_classdev *cled)
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{
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struct pm8058_led *led;
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int ret;
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unsigned int val;
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led = container_of(cled, struct pm8058_led, cdev);
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ret = regmap_read(led->map, led->reg, &val);
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if (ret) {
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pr_err("Failed to get LED brightness\n");
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return LED_OFF;
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}
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switch (led->ledtype) {
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case PM8058_LED_TYPE_COMMON:
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val &= PM8058_LED_TYPE_COMMON_MASK;
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val >>= PM8058_LED_TYPE_COMMON_SHIFT;
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break;
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case PM8058_LED_TYPE_KEYPAD:
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case PM8058_LED_TYPE_FLASH:
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val &= PM8058_LED_TYPE_KEYPAD_MASK;
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val >>= PM8058_LED_TYPE_KEYPAD_SHIFT;
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break;
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default:
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val = LED_OFF;
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break;
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}
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return val;
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}
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static int pm8058_led_probe(struct platform_device *pdev)
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{
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struct pm8058_led *led;
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struct device_node *np = pdev->dev.of_node;
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int ret;
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struct regmap *map;
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const char *state;
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enum led_brightness maxbright;
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led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
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if (!led)
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return -ENOMEM;
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led->ledtype = (u32)of_device_get_match_data(&pdev->dev);
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map = dev_get_regmap(pdev->dev.parent, NULL);
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if (!map) {
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dev_err(&pdev->dev, "Parent regmap unavailable.\n");
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return -ENXIO;
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}
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led->map = map;
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ret = of_property_read_u32(np, "reg", &led->reg);
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if (ret) {
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dev_err(&pdev->dev, "no register offset specified\n");
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return -EINVAL;
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}
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/* Use label else node name */
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led->cdev.name = of_get_property(np, "label", NULL) ? : np->name;
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led->cdev.default_trigger =
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of_get_property(np, "linux,default-trigger", NULL);
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led->cdev.brightness_set = pm8058_led_set;
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led->cdev.brightness_get = pm8058_led_get;
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if (led->ledtype == PM8058_LED_TYPE_COMMON)
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maxbright = 31; /* 5 bits */
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else
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maxbright = 15; /* 4 bits */
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led->cdev.max_brightness = maxbright;
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state = of_get_property(np, "default-state", NULL);
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if (state) {
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if (!strcmp(state, "keep")) {
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led->cdev.brightness = pm8058_led_get(&led->cdev);
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} else if (!strcmp(state, "on")) {
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led->cdev.brightness = maxbright;
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pm8058_led_set(&led->cdev, maxbright);
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} else {
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led->cdev.brightness = LED_OFF;
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pm8058_led_set(&led->cdev, LED_OFF);
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}
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}
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if (led->ledtype == PM8058_LED_TYPE_KEYPAD ||
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led->ledtype == PM8058_LED_TYPE_FLASH)
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led->cdev.flags = LED_CORE_SUSPENDRESUME;
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ret = devm_led_classdev_register(&pdev->dev, &led->cdev);
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if (ret) {
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dev_err(&pdev->dev, "unable to register led \"%s\"\n",
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led->cdev.name);
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return ret;
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}
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return 0;
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}
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static const struct of_device_id pm8058_leds_id_table[] = {
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{
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.compatible = "qcom,pm8058-led",
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.data = (void *)PM8058_LED_TYPE_COMMON
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},
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{
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.compatible = "qcom,pm8058-keypad-led",
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.data = (void *)PM8058_LED_TYPE_KEYPAD
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},
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{
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.compatible = "qcom,pm8058-flash-led",
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.data = (void *)PM8058_LED_TYPE_FLASH
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},
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{ },
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};
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MODULE_DEVICE_TABLE(of, pm8058_leds_id_table);
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static struct platform_driver pm8058_led_driver = {
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.probe = pm8058_led_probe,
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.driver = {
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.name = "pm8058-leds",
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.of_match_table = pm8058_leds_id_table,
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},
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};
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module_platform_driver(pm8058_led_driver);
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MODULE_DESCRIPTION("PM8058 LEDs driver");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:pm8058-leds");