--- /dev/null
+/*
+ * 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/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 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 = dev_get_platdata(da9052->dev);
+ 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) {
+ 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 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 = dev_get_platdata(da9052->dev);
+ 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",
+ },
+ .probe = da9052_led_probe,
+ .remove = 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");
Code Review / kvmfornfv.git / blobdiff