cregit-Linux how code gets into the kernel

Release 4.7 drivers/hid/hid-picolcd_backlight.c

Directory: drivers/hid
/***************************************************************************
 *   Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org>  *
 *                                                                         *
 *   Based on Logitech G13 driver (v0.4)                                   *
 *     Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu>   *
 *                                                                         *
 *   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, version 2 of the License.               *
 *                                                                         *
 *   This driver is distributed in the hope that it will be useful, but    *
 *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      *
 *   General Public License for more details.                              *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this software. If not see <http://www.gnu.org/licenses/>.  *
 ***************************************************************************/

#include <linux/hid.h>

#include <linux/fb.h>
#include <linux/backlight.h>

#include "hid-picolcd.h"


static int picolcd_get_brightness(struct backlight_device *bdev) { struct picolcd_data *data = bl_get_data(bdev); return data->lcd_brightness; }

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bruno premontbruno premont26100.00%1100.00%
Total26100.00%1100.00%


static int picolcd_set_brightness(struct backlight_device *bdev) { struct picolcd_data *data = bl_get_data(bdev); struct hid_report *report = picolcd_out_report(REPORT_BRIGHTNESS, data->hdev); unsigned long flags; if (!report || report->maxfield != 1 || report->field[0]->report_count != 1) return -ENODEV; data->lcd_brightness = bdev->props.brightness & 0x0ff; data->lcd_power = bdev->props.power; spin_lock_irqsave(&data->lock, flags); hid_set_field(report->field[0], 0, data->lcd_power == FB_BLANK_UNBLANK ? data->lcd_brightness : 0); if (!(data->status & PICOLCD_FAILED)) hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT); spin_unlock_irqrestore(&data->lock, flags); return 0; }

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bruno premontbruno premont15498.72%266.67%
benjamin tissoiresbenjamin tissoires21.28%133.33%
Total156100.00%3100.00%


static int picolcd_check_bl_fb(struct backlight_device *bdev, struct fb_info *fb) { return fb && fb == picolcd_fbinfo((struct picolcd_data *)bl_get_data(bdev)); }

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bruno premontbruno premont34100.00%1100.00%
Total34100.00%1100.00%

static const struct backlight_ops picolcd_blops = { .update_status = picolcd_set_brightness, .get_brightness = picolcd_get_brightness, .check_fb = picolcd_check_bl_fb, };
int picolcd_init_backlight(struct picolcd_data *data, struct hid_report *report) { struct device *dev = &data->hdev->dev; struct backlight_device *bdev; struct backlight_properties props; if (!report) return -ENODEV; if (report->maxfield != 1 || report->field[0]->report_count != 1 || report->field[0]->report_size != 8) { dev_err(dev, "unsupported BRIGHTNESS report"); return -EINVAL; } memset(&props, 0, sizeof(props)); props.type = BACKLIGHT_RAW; props.max_brightness = 0xff; bdev = backlight_device_register(dev_name(dev), dev, data, &picolcd_blops, &props); if (IS_ERR(bdev)) { dev_err(dev, "failed to register backlight\n"); return PTR_ERR(bdev); } bdev->props.brightness = 0xff; data->lcd_brightness = 0xff; data->backlight = bdev; picolcd_set_brightness(bdev); return 0; }

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bruno premontbruno premont183100.00%1100.00%
Total183100.00%1100.00%


void picolcd_exit_backlight(struct picolcd_data *data) { struct backlight_device *bdev = data->backlight; data->backlight = NULL; backlight_device_unregister(bdev); }

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bruno premontbruno premont30100.00%1100.00%
Total30100.00%1100.00%


int picolcd_resume_backlight(struct picolcd_data *data) { if (!data->backlight) return 0; return picolcd_set_brightness(data->backlight); }

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bruno premontbruno premont28100.00%1100.00%
Total28100.00%1100.00%

#ifdef CONFIG_PM
void picolcd_suspend_backlight(struct picolcd_data *data) { int bl_power = data->lcd_power; if (!data->backlight) return; data->backlight->props.power = FB_BLANK_POWERDOWN; picolcd_set_brightness(data->backlight); data->lcd_power = data->backlight->props.power = bl_power; }

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bruno premontbruno premont56100.00%1100.00%
Total56100.00%1100.00%

#endif /* CONFIG_PM */

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PersonTokensPropCommitsCommitProp
bruno premontbruno premont55399.64%266.67%
benjamin tissoiresbenjamin tissoires20.36%133.33%
Total555100.00%3100.00%
Directory: drivers/hid
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