HID: picoLCD: split driver code

In order to make code maintenance easier, split the vairous
functions into individial files (this removes a bunch of #ifdefs).

Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 121 insertions, 0 deletions

diff --git a/drivers/hid/hid-picolcd_backlight.c b/drivers/hid/hid-picolcd_backlight.c
new file mode 100644
index 000000000000..cd1ccd7205cd
--- /dev/null
+++ b/drivers/hid/hid-picolcd_backlight.c
@@ -0,0 +1,121 @@
+/***************************************************************************
+ *   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 "usbhid/usbhid.h"
+#include <linux/usb.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;
+}
+
+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);
+        usbhid_submit_report(data->hdev, report, USB_DIR_OUT);
+        spin_unlock_irqrestore(&data->lock, flags);
+        return 0;
+}
+
+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));
+}
+
+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;
+}
+
+void picolcd_exit_backlight(struct picolcd_data *data)
+{
+        struct backlight_device *bdev = data->backlight;
+
+        data->backlight = NULL;
+        if (bdev)
+                backlight_device_unregister(bdev);
+}
+
+int picolcd_resume_backlight(struct picolcd_data *data)
+{
+        if (!data->backlight)
+                return 0;
+        return picolcd_set_brightness(data->backlight);
+}
+
+#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;
+}
+#endif /* CONFIG_PM */
+