Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / hid / hid-picolcd_lcd.c

diff --git a/kernel/drivers/hid/hid-picolcd_lcd.c b/kernel/drivers/hid/hid-picolcd_lcd.c
new file mode 100644 (file)
index 0000000..89821c2
--- /dev/null
+++ b/kernel/drivers/hid/hid-picolcd_lcd.c
@@ -0,0 +1,105 @@
+/***************************************************************************
+ *   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;
+}
+
+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;
+}
+
+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\n");
+               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);
+}
+