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![Rob Herring](/assets/img/avatar_default.png)
Convert string compares of DT node names to use of_node_name_eq helper instead. This removes direct access to the node name pointer. For instances using of_node_cmp, this has the side effect of now using case sensitive comparisons. This should not matter for any FDT based system which this is. Cc: linux-leds@vger.kernel.org Signed-off-by: Rob Herring <robh@kernel.org> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
232 lines
5.6 KiB
C
232 lines
5.6 KiB
C
/*
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* LED driver for Marvell 88PM860x
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*
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* Copyright (C) 2009 Marvell International Ltd.
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* Haojian Zhuang <haojian.zhuang@marvell.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/slab.h>
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#include <linux/mfd/88pm860x.h>
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#include <linux/module.h>
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#define LED_PWM_MASK (0x1F)
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#define LED_CURRENT_MASK (0x07 << 5)
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#define LED_BLINK_MASK (0x7F)
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#define LED_ON_CONTINUOUS (0x0F << 3)
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#define LED1_BLINK_EN (1 << 1)
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#define LED2_BLINK_EN (1 << 2)
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struct pm860x_led {
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struct led_classdev cdev;
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struct i2c_client *i2c;
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struct pm860x_chip *chip;
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struct mutex lock;
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char name[MFD_NAME_SIZE];
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int port;
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int iset;
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unsigned char brightness;
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unsigned char current_brightness;
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int reg_control;
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int reg_blink;
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int blink_mask;
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};
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static int led_power_set(struct pm860x_chip *chip, int port, int on)
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{
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int ret = -EINVAL;
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switch (port) {
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case 0:
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case 1:
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case 2:
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ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
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pm8606_osc_disable(chip, RGB1_ENABLE);
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break;
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case 3:
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case 4:
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case 5:
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ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
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pm8606_osc_disable(chip, RGB2_ENABLE);
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break;
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}
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return ret;
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}
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static int pm860x_led_set(struct led_classdev *cdev,
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enum led_brightness value)
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{
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struct pm860x_led *led = container_of(cdev, struct pm860x_led, cdev);
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struct pm860x_chip *chip;
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unsigned char buf[3];
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int ret;
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chip = led->chip;
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mutex_lock(&led->lock);
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led->brightness = value >> 3;
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if ((led->current_brightness == 0) && led->brightness) {
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led_power_set(chip, led->port, 1);
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if (led->iset) {
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pm860x_set_bits(led->i2c, led->reg_control,
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LED_CURRENT_MASK, led->iset);
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}
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pm860x_set_bits(led->i2c, led->reg_blink,
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LED_BLINK_MASK, LED_ON_CONTINUOUS);
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pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask,
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led->blink_mask);
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}
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pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK,
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led->brightness);
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if (led->brightness == 0) {
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pm860x_bulk_read(led->i2c, led->reg_control, 3, buf);
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ret = buf[0] & LED_PWM_MASK;
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ret |= buf[1] & LED_PWM_MASK;
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ret |= buf[2] & LED_PWM_MASK;
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if (ret == 0) {
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/* unset current since no led is lighting */
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pm860x_set_bits(led->i2c, led->reg_control,
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LED_CURRENT_MASK, 0);
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pm860x_set_bits(led->i2c, PM8606_WLED3B,
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led->blink_mask, 0);
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led_power_set(chip, led->port, 0);
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}
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}
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led->current_brightness = led->brightness;
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dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
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led->reg_control, led->brightness);
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mutex_unlock(&led->lock);
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return 0;
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}
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#ifdef CONFIG_OF
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static int pm860x_led_dt_init(struct platform_device *pdev,
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struct pm860x_led *data)
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{
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struct device_node *nproot, *np;
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int iset = 0;
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if (!pdev->dev.parent->of_node)
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return -ENODEV;
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nproot = of_get_child_by_name(pdev->dev.parent->of_node, "leds");
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if (!nproot) {
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dev_err(&pdev->dev, "failed to find leds node\n");
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return -ENODEV;
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}
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for_each_child_of_node(nproot, np) {
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if (of_node_name_eq(np, data->name)) {
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of_property_read_u32(np, "marvell,88pm860x-iset",
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&iset);
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data->iset = PM8606_LED_CURRENT(iset);
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of_node_put(np);
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break;
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}
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}
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of_node_put(nproot);
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return 0;
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}
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#else
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#define pm860x_led_dt_init(x, y) (-1)
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#endif
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static int pm860x_led_probe(struct platform_device *pdev)
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{
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struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
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struct pm860x_led_pdata *pdata = dev_get_platdata(&pdev->dev);
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struct pm860x_led *data;
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struct resource *res;
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int ret = 0;
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data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
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if (data == NULL)
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return -ENOMEM;
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res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control");
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if (!res) {
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dev_err(&pdev->dev, "No REG resource for control\n");
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return -ENXIO;
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}
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data->reg_control = res->start;
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res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink");
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if (!res) {
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dev_err(&pdev->dev, "No REG resource for blink\n");
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return -ENXIO;
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}
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data->reg_blink = res->start;
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memset(data->name, 0, MFD_NAME_SIZE);
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switch (pdev->id) {
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case 0:
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data->blink_mask = LED1_BLINK_EN;
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sprintf(data->name, "led0-red");
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break;
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case 1:
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data->blink_mask = LED1_BLINK_EN;
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sprintf(data->name, "led0-green");
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break;
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case 2:
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data->blink_mask = LED1_BLINK_EN;
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sprintf(data->name, "led0-blue");
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break;
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case 3:
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data->blink_mask = LED2_BLINK_EN;
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sprintf(data->name, "led1-red");
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break;
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case 4:
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data->blink_mask = LED2_BLINK_EN;
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sprintf(data->name, "led1-green");
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break;
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case 5:
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data->blink_mask = LED2_BLINK_EN;
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sprintf(data->name, "led1-blue");
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break;
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}
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data->chip = chip;
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data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
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data->port = pdev->id;
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if (pm860x_led_dt_init(pdev, data))
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if (pdata)
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data->iset = pdata->iset;
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data->current_brightness = 0;
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data->cdev.name = data->name;
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data->cdev.brightness_set_blocking = pm860x_led_set;
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mutex_init(&data->lock);
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ret = devm_led_classdev_register(chip->dev, &data->cdev);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
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return ret;
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}
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pm860x_led_set(&data->cdev, 0);
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return 0;
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}
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static struct platform_driver pm860x_led_driver = {
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.driver = {
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.name = "88pm860x-led",
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},
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.probe = pm860x_led_probe,
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};
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module_platform_driver(pm860x_led_driver);
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MODULE_DESCRIPTION("LED driver for Marvell PM860x");
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MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:88pm860x-led");
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