leds: driver for DA9052/53 PMIC v2

LED Driver for Dialog Semiconductor DA9052/53 PMICs.

[akpm@linux-foundation.org: make led_reg static]
Signed-off-by: David Dajun Chen <dchen@diasemi.com>
Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Bryan Wu <bryan.wu@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 214 insertions, 0 deletions

diff --git a/drivers/leds/leds-da9052.c b/drivers/leds/leds-da9052.c
new file mode 100644
index 000000000000..58a5244c437e
--- /dev/null
+++ b/drivers/leds/leds-da9052.c
@@ -0,0 +1,214 @@
+/*
+ * LED Driver for Dialog DA9052 PMICs.
+ *
+ * Copyright(c) 2012 Dialog Semiconductor Ltd.
+ *
+ * Author: David Dajun Chen <dchen@diasemi.com>
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/workqueue.h>
+#include <linux/slab.h>
+
+#include <linux/mfd/da9052/reg.h>
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/pdata.h>
+
+#define DA9052_OPENDRAIN_OUTPUT 2
+#define DA9052_SET_HIGH_LVL_OUTPUT      (1 << 3)
+#define DA9052_MASK_UPPER_NIBBLE        0xF0
+#define DA9052_MASK_LOWER_NIBBLE        0x0F
+#define DA9052_NIBBLE_SHIFT             4
+#define DA9052_MAX_BRIGHTNESS           0x5f
+
+struct da9052_led {
+        struct led_classdev cdev;
+        struct work_struct work;
+        struct da9052 *da9052;
+        unsigned char led_index;
+        unsigned char id;
+        int brightness;
+};
+
+static unsigned char led_reg[] = {
+        DA9052_LED_CONT_4_REG,
+        DA9052_LED_CONT_5_REG,
+};
+
+static int da9052_set_led_brightness(struct da9052_led *led)
+{
+        u8 val;
+        int error;
+
+        val = (led->brightness & 0x7f) | DA9052_LED_CONT_DIM;
+
+        error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);
+        if (error < 0)
+                dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",
+                        error);
+        return error;
+}
+
+static void da9052_led_work(struct work_struct *work)
+{
+        struct da9052_led *led = container_of(work, struct da9052_led, work);
+
+        da9052_set_led_brightness(led);
+}
+
+static void da9052_led_set(struct led_classdev *led_cdev,
+                           enum led_brightness value)
+{
+        struct da9052_led *led;
+
+        led = container_of(led_cdev, struct da9052_led, cdev);
+        led->brightness = value;
+        schedule_work(&led->work);
+}
+
+static int da9052_configure_leds(struct da9052 *da9052)
+{
+        int error;
+        unsigned char register_value = DA9052_OPENDRAIN_OUTPUT
+                                       | DA9052_SET_HIGH_LVL_OUTPUT;
+
+        error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
+                                  DA9052_MASK_LOWER_NIBBLE,
+                                  register_value);
+
+        if (error < 0) {
+                dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
+                        error);
+                return error;
+        }
+
+        error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
+                                  DA9052_MASK_UPPER_NIBBLE,
+                                  register_value << DA9052_NIBBLE_SHIFT);
+        if (error < 0)
+                dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
+                        error);
+
+        return error;
+}
+
+static int __devinit da9052_led_probe(struct platform_device *pdev)
+{
+        struct da9052_pdata *pdata;
+        struct da9052 *da9052;
+        struct led_platform_data *pled;
+        struct da9052_led *led = NULL;
+        int error = -ENODEV;
+        int i;
+
+        da9052 = dev_get_drvdata(pdev->dev.parent);
+        pdata = da9052->dev->platform_data;
+        if (pdata == NULL) {
+                dev_err(&pdev->dev, "No platform data\n");
+                goto err;
+        }
+
+        pled = pdata->pled;
+        if (pled == NULL) {
+                dev_err(&pdev->dev, "No platform data for LED\n");
+                goto err;
+        }
+
+        led = devm_kzalloc(&pdev->dev,
+                           sizeof(struct da9052_led) * pled->num_leds,
+                           GFP_KERNEL);
+        if (led == NULL) {
+                dev_err(&pdev->dev, "Failed to alloc memory\n");
+                error = -ENOMEM;
+                goto err;
+        }
+
+        for (i = 0; i < pled->num_leds; i++) {
+                led[i].cdev.name = pled->leds[i].name;
+                led[i].cdev.brightness_set = da9052_led_set;
+                led[i].cdev.brightness = LED_OFF;
+                led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;
+                led[i].brightness = LED_OFF;
+                led[i].led_index = pled->leds[i].flags;
+                led[i].da9052 = dev_get_drvdata(pdev->dev.parent);
+                INIT_WORK(&led[i].work, da9052_led_work);
+
+                error = led_classdev_register(pdev->dev.parent, &led[i].cdev);
+                if (error) {
+                        dev_err(&pdev->dev, "Failed to register led %d\n",
+                                led[i].led_index);
+                        goto err_register;
+                }
+
+                error = da9052_set_led_brightness(&led[i]);
+                if (error) {
+                        dev_err(&pdev->dev, "Unable to init led %d\n",
+                                led[i].led_index);
+                        continue;
+                }
+        }
+        error = da9052_configure_leds(led->da9052);
+        if (error) {
+                dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);
+                goto err_register;
+        }
+
+        platform_set_drvdata(pdev, led);
+
+        return 0;
+
+err_register:
+        for (i = i - 1; i >= 0; i--) {
+                led_classdev_unregister(&led[i].cdev);
+                cancel_work_sync(&led[i].work);
+        }
+err:
+        return error;
+}
+
+static int __devexit da9052_led_remove(struct platform_device *pdev)
+{
+        struct da9052_led *led = platform_get_drvdata(pdev);
+        struct da9052_pdata *pdata;
+        struct da9052 *da9052;
+        struct led_platform_data *pled;
+        int i;
+
+        da9052 = dev_get_drvdata(pdev->dev.parent);
+        pdata = da9052->dev->platform_data;
+        pled = pdata->pled;
+
+        for (i = 0; i < pled->num_leds; i++) {
+                led[i].brightness = 0;
+                da9052_set_led_brightness(&led[i]);
+                led_classdev_unregister(&led[i].cdev);
+                cancel_work_sync(&led[i].work);
+        }
+
+        return 0;
+}
+
+static struct platform_driver da9052_led_driver = {
+        .driver         = {
+                .name   = "da9052-leds",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = da9052_led_probe,
+        .remove         = __devexit_p(da9052_led_remove),
+};
+
+module_platform_driver(da9052_led_driver);
+
+MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
+MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
+MODULE_LICENSE("GPL");