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>
diff --git a/drivers/leds/leds-pm8058.c b/drivers/leds/leds-pm8058.c
new file mode 100644
index 0000000..a526743
--- /dev/null
+++ b/drivers/leds/leds-pm8058.c
@@ -0,0 +1,191 @@
+/* Copyright (c) 2010, 2011, 2016 The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ */
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/regmap.h>
+
+#define PM8058_LED_TYPE_COMMON 0x00
+#define PM8058_LED_TYPE_KEYPAD 0x01
+#define PM8058_LED_TYPE_FLASH 0x02
+
+#define PM8058_LED_TYPE_COMMON_MASK 0xf8
+#define PM8058_LED_TYPE_KEYPAD_MASK 0xf0
+#define PM8058_LED_TYPE_COMMON_SHIFT 3
+#define PM8058_LED_TYPE_KEYPAD_SHIFT 4
+
+struct pm8058_led {
+ struct regmap *map;
+ u32 reg;
+ u32 ledtype;
+ struct led_classdev cdev;
+};
+
+static void pm8058_led_set(struct led_classdev *cled,
+ enum led_brightness value)
+{
+ struct pm8058_led *led;
+ int ret = 0;
+ unsigned int mask = 0;
+ unsigned int val = 0;
+
+ led = container_of(cled, struct pm8058_led, cdev);
+ switch (led->ledtype) {
+ case PM8058_LED_TYPE_COMMON:
+ mask = PM8058_LED_TYPE_COMMON_MASK;
+ val = value << PM8058_LED_TYPE_COMMON_SHIFT;
+ break;
+ case PM8058_LED_TYPE_KEYPAD:
+ case PM8058_LED_TYPE_FLASH:
+ mask = PM8058_LED_TYPE_KEYPAD_MASK;
+ val = value << PM8058_LED_TYPE_KEYPAD_SHIFT;
+ break;
+ default:
+ break;
+ }
+
+ ret = regmap_update_bits(led->map, led->reg, mask, val);
+ if (ret)
+ pr_err("Failed to set LED brightness\n");
+}
+
+static enum led_brightness pm8058_led_get(struct led_classdev *cled)
+{
+ struct pm8058_led *led;
+ int ret;
+ unsigned int val;
+
+ led = container_of(cled, struct pm8058_led, cdev);
+
+ ret = regmap_read(led->map, led->reg, &val);
+ if (ret) {
+ pr_err("Failed to get LED brightness\n");
+ return LED_OFF;
+ }
+
+ switch (led->ledtype) {
+ case PM8058_LED_TYPE_COMMON:
+ val &= PM8058_LED_TYPE_COMMON_MASK;
+ val >>= PM8058_LED_TYPE_COMMON_SHIFT;
+ break;
+ case PM8058_LED_TYPE_KEYPAD:
+ case PM8058_LED_TYPE_FLASH:
+ val &= PM8058_LED_TYPE_KEYPAD_MASK;
+ val >>= PM8058_LED_TYPE_KEYPAD_SHIFT;
+ break;
+ default:
+ val = LED_OFF;
+ break;
+ }
+
+ return val;
+}
+
+static int pm8058_led_probe(struct platform_device *pdev)
+{
+ struct pm8058_led *led;
+ struct device_node *np = pdev->dev.of_node;
+ int ret;
+ struct regmap *map;
+ const char *state;
+ enum led_brightness maxbright;
+
+ led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
+ if (!led)
+ return -ENOMEM;
+
+ led->ledtype = (u32)of_device_get_match_data(&pdev->dev);
+
+ map = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!map) {
+ dev_err(&pdev->dev, "Parent regmap unavailable.\n");
+ return -ENXIO;
+ }
+ led->map = map;
+
+ ret = of_property_read_u32(np, "reg", &led->reg);
+ if (ret) {
+ dev_err(&pdev->dev, "no register offset specified\n");
+ return -EINVAL;
+ }
+
+ /* Use label else node name */
+ led->cdev.name = of_get_property(np, "label", NULL) ? : np->name;
+ led->cdev.default_trigger =
+ of_get_property(np, "linux,default-trigger", NULL);
+ led->cdev.brightness_set = pm8058_led_set;
+ led->cdev.brightness_get = pm8058_led_get;
+ if (led->ledtype == PM8058_LED_TYPE_COMMON)
+ maxbright = 31; /* 5 bits */
+ else
+ maxbright = 15; /* 4 bits */
+ led->cdev.max_brightness = maxbright;
+
+ state = of_get_property(np, "default-state", NULL);
+ if (state) {
+ if (!strcmp(state, "keep")) {
+ led->cdev.brightness = pm8058_led_get(&led->cdev);
+ } else if (!strcmp(state, "on")) {
+ led->cdev.brightness = maxbright;
+ pm8058_led_set(&led->cdev, maxbright);
+ } else {
+ led->cdev.brightness = LED_OFF;
+ pm8058_led_set(&led->cdev, LED_OFF);
+ }
+ }
+
+ if (led->ledtype == PM8058_LED_TYPE_KEYPAD ||
+ led->ledtype == PM8058_LED_TYPE_FLASH)
+ led->cdev.flags = LED_CORE_SUSPENDRESUME;
+
+ ret = devm_led_classdev_register(&pdev->dev, &led->cdev);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to register led \"%s\"\n",
+ led->cdev.name);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id pm8058_leds_id_table[] = {
+ {
+ .compatible = "qcom,pm8058-led",
+ .data = (void *)PM8058_LED_TYPE_COMMON
+ },
+ {
+ .compatible = "qcom,pm8058-keypad-led",
+ .data = (void *)PM8058_LED_TYPE_KEYPAD
+ },
+ {
+ .compatible = "qcom,pm8058-flash-led",
+ .data = (void *)PM8058_LED_TYPE_FLASH
+ },
+ { },
+};
+MODULE_DEVICE_TABLE(of, pm8058_leds_id_table);
+
+static struct platform_driver pm8058_led_driver = {
+ .probe = pm8058_led_probe,
+ .driver = {
+ .name = "pm8058-leds",
+ .of_match_table = pm8058_leds_id_table,
+ },
+};
+module_platform_driver(pm8058_led_driver);
+
+MODULE_DESCRIPTION("PM8058 LEDs driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:pm8058-leds");