C++ (Cpp) atmel_pwm_bl_set_intensity Examples

Example #1

static int atmel_pwm_bl_probe(struct platform_device *pdev)
{
	const struct atmel_pwm_bl_platform_data *pdata;
	struct backlight_device *bldev;
	struct atmel_pwm_bl *pwmbl;
	int retval;

	pwmbl = kzalloc(sizeof(struct atmel_pwm_bl), GFP_KERNEL);
	if (!pwmbl)
		return -ENOMEM;

	pwmbl->pdev = pdev;

	pdata = pdev->dev.platform_data;
	if (!pdata) {
		retval = -ENODEV;
		goto err_free_mem;
	}

	if (pdata->pwm_compare_max < pdata->pwm_duty_max ||
			pdata->pwm_duty_min > pdata->pwm_duty_max ||
			pdata->pwm_frequency == 0) {
		retval = -EINVAL;
		goto err_free_mem;
	}

	pwmbl->pdata = pdata;
	pwmbl->gpio_on = pdata->gpio_on;

	retval = pwm_channel_alloc(pdata->pwm_channel, &pwmbl->pwmc);
	if (retval)
		goto err_free_mem;

	if (pwmbl->gpio_on != -1) {
		retval = gpio_request(pwmbl->gpio_on, "gpio_atmel_pwm_bl");
		if (retval) {
			pwmbl->gpio_on = -1;
			goto err_free_pwm;
		}

		
		retval = gpio_direction_output(pwmbl->gpio_on,
				0 ^ pdata->on_active_low);
		if (retval)
			goto err_free_gpio;
	}

	bldev = backlight_device_register("atmel-pwm-bl",
			&pdev->dev, pwmbl, &atmel_pwm_bl_ops);
	if (IS_ERR(bldev)) {
		retval = PTR_ERR(bldev);
		goto err_free_gpio;
	}

	pwmbl->bldev = bldev;

	platform_set_drvdata(pdev, pwmbl);

	
	bldev->props.power = FB_BLANK_UNBLANK;
	bldev->props.max_brightness = pdata->pwm_duty_max - pdata->pwm_duty_min;
	bldev->props.brightness = bldev->props.max_brightness / 2;

	retval = atmel_pwm_bl_init_pwm(pwmbl);
	if (retval)
		goto err_free_bl_dev;

	atmel_pwm_bl_set_intensity(bldev);

	return 0;

err_free_bl_dev:
	platform_set_drvdata(pdev, NULL);
	backlight_device_unregister(bldev);
err_free_gpio:
	if (pwmbl->gpio_on != -1)
		gpio_free(pwmbl->gpio_on);
err_free_pwm:
	pwm_channel_free(&pwmbl->pwmc);
err_free_mem:
	kfree(pwmbl);
	return retval;
}

Example #2

File: atmel-pwm-bl.c Project: AD5GB/kernel_n5_3.10-experimental

static int __init atmel_pwm_bl_probe(struct platform_device *pdev)
{
	struct backlight_properties props;
	const struct atmel_pwm_bl_platform_data *pdata;
	struct backlight_device *bldev;
	struct atmel_pwm_bl *pwmbl;
	int retval;

	pwmbl = devm_kzalloc(&pdev->dev, sizeof(struct atmel_pwm_bl),
				GFP_KERNEL);
	if (!pwmbl)
		return -ENOMEM;

	pwmbl->pdev = pdev;

	pdata = pdev->dev.platform_data;
	if (!pdata) {
		retval = -ENODEV;
		goto err_free_mem;
	}

	if (pdata->pwm_compare_max < pdata->pwm_duty_max ||
			pdata->pwm_duty_min > pdata->pwm_duty_max ||
			pdata->pwm_frequency == 0) {
		retval = -EINVAL;
		goto err_free_mem;
	}

	pwmbl->pdata = pdata;
	pwmbl->gpio_on = pdata->gpio_on;

	retval = pwm_channel_alloc(pdata->pwm_channel, &pwmbl->pwmc);
	if (retval)
		goto err_free_mem;

	if (pwmbl->gpio_on != -1) {
		retval = devm_gpio_request(&pdev->dev, pwmbl->gpio_on,
					"gpio_atmel_pwm_bl");
		if (retval) {
			pwmbl->gpio_on = -1;
			goto err_free_pwm;
		}

		/* Turn display off by default. */
		retval = gpio_direction_output(pwmbl->gpio_on,
				0 ^ pdata->on_active_low);
		if (retval)
			goto err_free_pwm;
	}

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = pdata->pwm_duty_max - pdata->pwm_duty_min;
	bldev = backlight_device_register("atmel-pwm-bl", &pdev->dev, pwmbl,
					  &atmel_pwm_bl_ops, &props);
	if (IS_ERR(bldev)) {
		retval = PTR_ERR(bldev);
		goto err_free_pwm;
	}

	pwmbl->bldev = bldev;

	platform_set_drvdata(pdev, pwmbl);

	/* Power up the backlight by default at middle intesity. */
	bldev->props.power = FB_BLANK_UNBLANK;
	bldev->props.brightness = bldev->props.max_brightness / 2;

	retval = atmel_pwm_bl_init_pwm(pwmbl);
	if (retval)
		goto err_free_bl_dev;

	atmel_pwm_bl_set_intensity(bldev);

	return 0;

err_free_bl_dev:
	platform_set_drvdata(pdev, NULL);
	backlight_device_unregister(bldev);
err_free_pwm:
	pwm_channel_free(&pwmbl->pwmc);
err_free_mem:
	return retval;
}