Eric Lee / smarc-ti-linux-kernel

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drivers/hid/hid-picolcd_lcd.c 3.46 KB
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fabdbf2fd   Bruno Prémont   HID: picoLCD: spl... 
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  /***************************************************************************
   *   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>
fabdbf2fd   Bruno Prémont   HID: picoLCD: spl... 
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  #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;
  }
  
  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);
a93ab8494   Bruno Prémont   HID: picoLCD: Imp... 
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  	if (!(data->status & PICOLCD_FAILED))
d88142725   Benjamin Tissoires   HID: use hid_hw_r... 
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  		hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT);
fabdbf2fd   Bruno Prémont   HID: picoLCD: spl... 
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  	spin_unlock_irqrestore(&data->lock, flags);
  	return 0;
  }
  
  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));
  }
  
  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
  ");
  		return PTR_ERR(ldev);
  	}
  	ldev->props.max_contrast = 0x0ff;
  	data->lcd_contrast = 0xe5;
  	data->lcd = ldev;
  	picolcd_set_contrast(ldev, 0xe5);
  	return 0;
  }
  
  void picolcd_exit_lcd(struct picolcd_data *data)
  {
  	struct lcd_device *ldev = data->lcd;
  
  	data->lcd = NULL;
  	if (ldev)
  		lcd_device_unregister(ldev);
  }
  
  int picolcd_resume_lcd(struct picolcd_data *data)
  {
  	if (!data->lcd)
  		return 0;
  	return picolcd_set_contrast(data->lcd, data->lcd_contrast);
  }