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>

3 files changed, 200 insertions, 0 deletions

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 6df9a2f098f5..969c720dfd10 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -643,6 +643,14 @@ config LEDS_VERSATILE
           This option enabled support for the LEDs on the ARM Versatile
           and RealView boards. Say Y to enabled these.
 
+config LEDS_PM8058
+        tristate "LED Support for the Qualcomm PM8058 PMIC"
+        depends on MFD_PM8921_CORE
+        depends on LEDS_CLASS
+        help
+          Choose this option if you want to use the LED drivers in
+          the Qualcomm PM8058 PMIC.
+
 comment "LED Triggers"
 source "drivers/leds/trigger/Kconfig"
 
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index e7a0e4edadd4..06a27ef17554 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -69,6 +69,7 @@ obj-$(CONFIG_LEDS_POWERNV)		+= leds-powernv.o
 obj-$(CONFIG_LEDS_SEAD3)                += leds-sead3.o
 obj-$(CONFIG_LEDS_IS31FL319X)           += leds-is31fl319x.o
 obj-$(CONFIG_LEDS_IS31FL32XX)           += leds-is31fl32xx.o
+obj-$(CONFIG_LEDS_PM8058)               += leds-pm8058.o
 
 # LED SPI Drivers
 obj-$(CONFIG_LEDS_DAC124S085)           += leds-dac124s085.o
diff --git a/drivers/leds/leds-pm8058.c b/drivers/leds/leds-pm8058.c
new file mode 100644
index 000000000000..a52674327857
--- /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");