--- /dev/null
+/*
+ * LED driver for Marvell 88PM860x
+ *
+ * Copyright (C) 2009 Marvell International Ltd.
+ * Haojian Zhuang <haojian.zhuang@marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/mfd/88pm860x.h>
+#include <linux/module.h>
+
+#define LED_PWM_MASK (0x1F)
+#define LED_CURRENT_MASK (0x07 << 5)
+
+#define LED_BLINK_MASK (0x7F)
+
+#define LED_ON_CONTINUOUS (0x0F << 3)
+
+#define LED1_BLINK_EN (1 << 1)
+#define LED2_BLINK_EN (1 << 2)
+
+struct pm860x_led {
+ struct led_classdev cdev;
+ struct i2c_client *i2c;
+ struct work_struct work;
+ struct pm860x_chip *chip;
+ struct mutex lock;
+ char name[MFD_NAME_SIZE];
+
+ int port;
+ int iset;
+ unsigned char brightness;
+ unsigned char current_brightness;
+
+ int reg_control;
+ int reg_blink;
+ int blink_mask;
+};
+
+static int led_power_set(struct pm860x_chip *chip, int port, int on)
+{
+ int ret = -EINVAL;
+
+ switch (port) {
+ case 0:
+ case 1:
+ case 2:
+ ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
+ pm8606_osc_disable(chip, RGB1_ENABLE);
+ break;
+ case 3:
+ case 4:
+ case 5:
+ ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
+ pm8606_osc_disable(chip, RGB2_ENABLE);
+ break;
+ }
+ return ret;
+}
+
+static void pm860x_led_work(struct work_struct *work)
+{
+
+ struct pm860x_led *led;
+ struct pm860x_chip *chip;
+ unsigned char buf[3];
+ int ret;
+
+ led = container_of(work, struct pm860x_led, work);
+ chip = led->chip;
+ mutex_lock(&led->lock);
+ if ((led->current_brightness == 0) && led->brightness) {
+ led_power_set(chip, led->port, 1);
+ if (led->iset) {
+ pm860x_set_bits(led->i2c, led->reg_control,
+ LED_CURRENT_MASK, led->iset);
+ }
+ pm860x_set_bits(led->i2c, led->reg_blink,
+ LED_BLINK_MASK, LED_ON_CONTINUOUS);
+ pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask,
+ led->blink_mask);
+ }
+ pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK,
+ led->brightness);
+
+ if (led->brightness == 0) {
+ pm860x_bulk_read(led->i2c, led->reg_control, 3, buf);
+ ret = buf[0] & LED_PWM_MASK;
+ ret |= buf[1] & LED_PWM_MASK;
+ ret |= buf[2] & LED_PWM_MASK;
+ if (ret == 0) {
+ /* unset current since no led is lighting */
+ pm860x_set_bits(led->i2c, led->reg_control,
+ LED_CURRENT_MASK, 0);
+ pm860x_set_bits(led->i2c, PM8606_WLED3B,
+ led->blink_mask, 0);
+ led_power_set(chip, led->port, 0);
+ }
+ }
+ led->current_brightness = led->brightness;
+ dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
+ led->reg_control, led->brightness);
+ mutex_unlock(&led->lock);
+}
+
+static void pm860x_led_set(struct led_classdev *cdev,
+ enum led_brightness value)
+{
+ struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
+
+ data->brightness = value >> 3;
+ schedule_work(&data->work);
+}
+
+#ifdef CONFIG_OF
+static int pm860x_led_dt_init(struct platform_device *pdev,
+ struct pm860x_led *data)
+{
+ struct device_node *nproot, *np;
+ int iset = 0;
+
+ if (!pdev->dev.parent->of_node)
+ return -ENODEV;
+ nproot = of_get_child_by_name(pdev->dev.parent->of_node, "leds");
+ if (!nproot) {
+ dev_err(&pdev->dev, "failed to find leds node\n");
+ return -ENODEV;
+ }
+ for_each_child_of_node(nproot, np) {
+ if (!of_node_cmp(np->name, data->name)) {
+ of_property_read_u32(np, "marvell,88pm860x-iset",
+ &iset);
+ data->iset = PM8606_LED_CURRENT(iset);
+ break;
+ }
+ }
+ of_node_put(nproot);
+ return 0;
+}
+#else
+#define pm860x_led_dt_init(x, y) (-1)
+#endif
+
+static int pm860x_led_probe(struct platform_device *pdev)
+{
+ struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
+ struct pm860x_led_pdata *pdata = dev_get_platdata(&pdev->dev);
+ struct pm860x_led *data;
+ struct resource *res;
+ int ret = 0;
+
+ data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
+ if (data == NULL)
+ return -ENOMEM;
+ res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control");
+ if (!res) {
+ dev_err(&pdev->dev, "No REG resource for control\n");
+ return -ENXIO;
+ }
+ data->reg_control = res->start;
+ res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink");
+ if (!res) {
+ dev_err(&pdev->dev, "No REG resource for blink\n");
+ return -ENXIO;
+ }
+ data->reg_blink = res->start;
+ memset(data->name, 0, MFD_NAME_SIZE);
+ switch (pdev->id) {
+ case 0:
+ data->blink_mask = LED1_BLINK_EN;
+ sprintf(data->name, "led0-red");
+ break;
+ case 1:
+ data->blink_mask = LED1_BLINK_EN;
+ sprintf(data->name, "led0-green");
+ break;
+ case 2:
+ data->blink_mask = LED1_BLINK_EN;
+ sprintf(data->name, "led0-blue");
+ break;
+ case 3:
+ data->blink_mask = LED2_BLINK_EN;
+ sprintf(data->name, "led1-red");
+ break;
+ case 4:
+ data->blink_mask = LED2_BLINK_EN;
+ sprintf(data->name, "led1-green");
+ break;
+ case 5:
+ data->blink_mask = LED2_BLINK_EN;
+ sprintf(data->name, "led1-blue");
+ break;
+ }
+ platform_set_drvdata(pdev, data);
+ data->chip = chip;
+ data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
+ data->port = pdev->id;
+ if (pm860x_led_dt_init(pdev, data))
+ if (pdata)
+ data->iset = pdata->iset;
+
+ data->current_brightness = 0;
+ data->cdev.name = data->name;
+ data->cdev.brightness_set = pm860x_led_set;
+ mutex_init(&data->lock);
+ INIT_WORK(&data->work, pm860x_led_work);
+
+ ret = led_classdev_register(chip->dev, &data->cdev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
+ return ret;
+ }
+ pm860x_led_set(&data->cdev, 0);
+ return 0;
+}
+
+static int pm860x_led_remove(struct platform_device *pdev)
+{
+ struct pm860x_led *data = platform_get_drvdata(pdev);
+
+ led_classdev_unregister(&data->cdev);
+
+ return 0;
+}
+
+static struct platform_driver pm860x_led_driver = {
+ .driver = {
+ .name = "88pm860x-led",
+ },
+ .probe = pm860x_led_probe,
+ .remove = pm860x_led_remove,
+};
+
+module_platform_driver(pm860x_led_driver);
+
+MODULE_DESCRIPTION("LED driver for Marvell PM860x");
+MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:88pm860x-led");
Code Review / kvmfornfv.git / blobdiff