cregit-Linux how code gets into the kernel

Release 4.7 drivers/hid/hid-picolcd_lcd.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/lcd.h>

#include "hid-picolcd.h"

/*
 * lcd class device
 */

static int picolcd_get_contrast(struct lcd_device *ldev) { struct picolcd_data *data = lcd_get_data(ldev); return data->lcd_contrast; }

Contributors

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


static int picolcd_set_contrast(struct lcd_device *ldev, int contrast) { struct picolcd_data *data = lcd_get_data(ldev); struct hid_report *report = picolcd_out_report(REPORT_CONTRAST, data->hdev); unsigned long flags; if (!report || report->maxfield != 1 || report->field[0]->report_count != 1) return -ENODEV; data->lcd_contrast = contrast & 0x0ff; spin_lock_irqsave(&data->lock, flags); hid_set_field(report->field[0], 0, data->lcd_contrast); if (!(data->status & PICOLCD_FAILED)) hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT); spin_unlock_irqrestore(&data->lock, flags); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
bruno premontbruno premont13598.54%266.67%
benjamin tissoiresbenjamin tissoires21.46%133.33%
Total137100.00%3100.00%


static int picolcd_check_lcd_fb(struct lcd_device *ldev, struct fb_info *fb) { return fb && fb == picolcd_fbinfo((struct picolcd_data *)lcd_get_data(ldev)); }

Contributors

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

static struct lcd_ops picolcd_lcdops = { .get_contrast = picolcd_get_contrast, .set_contrast = picolcd_set_contrast, .check_fb = picolcd_check_lcd_fb, };
int picolcd_init_lcd(struct picolcd_data *data, struct hid_report *report) { struct device *dev = &data->hdev->dev; struct lcd_device *ldev; if (!report) return -ENODEV; if (report->maxfield != 1 || report->field[0]->report_count != 1 || report->field[0]->report_size != 8) { dev_err(dev, "unsupported CONTRAST report"); return -EINVAL; } ldev = lcd_device_register(dev_name(dev), dev, data, &picolcd_lcdops); if (IS_ERR(ldev)) { dev_err(dev, "failed to register LCD\n"); return PTR_ERR(ldev); } ldev->props.max_contrast = 0x0ff; data->lcd_contrast = 0xe5; data->lcd = ldev; picolcd_set_contrast(ldev, 0xe5); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
bruno premontbruno premont153100.00%1100.00%
Total153100.00%1100.00%


void picolcd_exit_lcd(struct picolcd_data *data) { struct lcd_device *ldev = data->lcd; data->lcd = NULL; lcd_device_unregister(ldev); }

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


int picolcd_resume_lcd(struct picolcd_data *data) { if (!data->lcd) return 0; return picolcd_set_contrast(data->lcd, data->lcd_contrast); }

Contributors

PersonTokensPropCommitsCommitProp
bruno premontbruno premont32100.00%1100.00%
Total32100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
bruno premontbruno premont44699.55%266.67%
benjamin tissoiresbenjamin tissoires20.45%133.33%
Total448100.00%3100.00%
Directory: drivers/hid
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