projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| fabdbf2f BP |
1 | /*************************************************************************** |
| 2 | * Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org> * | |
| 3 | * * | |
| 4 | * Based on Logitech G13 driver (v0.4) * | |
| 5 | * Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu> * | |
| 6 | * * | |
| 7 | * This program is free software: you can redistribute it and/or modify * | |
| 8 | * it under the terms of the GNU General Public License as published by * | |
| 9 | * the Free Software Foundation, version 2 of the License. * | |
| 10 | * * | |
| 11 | * This driver is distributed in the hope that it will be useful, but * | |
| 12 | * WITHOUT ANY WARRANTY; without even the implied warranty of * | |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * | |
| 14 | * General Public License for more details. * | |
| 15 | * * | |
| 16 | * You should have received a copy of the GNU General Public License * | |
| 17 | * along with this software. If not see <http://www.gnu.org/licenses/>. * | |
| 18 | ***************************************************************************/ | |
| 19 | ||
| 20 | #include <linux/hid.h> | |
| 21 | #include "usbhid/usbhid.h" | |
| 22 | #include <linux/usb.h> | |
| 23 | ||
| 24 | #include <linux/fb.h> | |
| 25 | #include <linux/lcd.h> | |
| 26 | ||
| 27 | #include "hid-picolcd.h" | |
| 28 | ||
| 29 | /* | |
| 30 | * lcd class device | |
| 31 | */ | |
| 32 | static int picolcd_get_contrast(struct lcd_device *ldev) | |
| 33 | { | |
| 34 | struct picolcd_data *data = lcd_get_data(ldev); | |
| 35 | return data->lcd_contrast; | |
| 36 | } | |
| 37 | ||
| 38 | static int picolcd_set_contrast(struct lcd_device *ldev, int contrast) | |
| 39 | { | |
| 40 | struct picolcd_data *data = lcd_get_data(ldev); | |
| 41 | struct hid_report *report = picolcd_out_report(REPORT_CONTRAST, data->hdev); | |
| 42 | unsigned long flags; | |
| 43 | ||
| 44 | if (!report || report->maxfield != 1 || report->field[0]->report_count != 1) | |
| 45 | return -ENODEV; | |
| 46 | ||
| 47 | data->lcd_contrast = contrast & 0x0ff; | |
| 48 | spin_lock_irqsave(&data->lock, flags); | |
| 49 | hid_set_field(report->field[0], 0, data->lcd_contrast); | |
| 50 | usbhid_submit_report(data->hdev, report, USB_DIR_OUT); | |
| 51 | spin_unlock_irqrestore(&data->lock, flags); | |
| 52 | return 0; | |
| 53 | } | |
| 54 | ||
| 55 | static int picolcd_check_lcd_fb(struct lcd_device *ldev, struct fb_info *fb) | |
| 56 | { | |
| 57 | return fb && fb == picolcd_fbinfo((struct picolcd_data *)lcd_get_data(ldev)); | |
| 58 | } | |
| 59 | ||
| 60 | static struct lcd_ops picolcd_lcdops = { | |
| 61 | .get_contrast = picolcd_get_contrast, | |
| 62 | .set_contrast = picolcd_set_contrast, | |
| 63 | .check_fb = picolcd_check_lcd_fb, | |
| 64 | }; | |
| 65 | ||
| 66 | int picolcd_init_lcd(struct picolcd_data *data, struct hid_report *report) | |
| 67 | { | |
| 68 | struct device *dev = &data->hdev->dev; | |
| 69 | struct lcd_device *ldev; | |
| 70 | ||
| 71 | if (!report) | |
| 72 | return -ENODEV; | |
| 73 | if (report->maxfield != 1 || report->field[0]->report_count != 1 || | |
| 74 | report->field[0]->report_size != 8) { | |
| 75 | dev_err(dev, "unsupported CONTRAST report"); | |
| 76 | return -EINVAL; | |
| 77 | } | |
| 78 | ||
| 79 | ldev = lcd_device_register(dev_name(dev), dev, data, &picolcd_lcdops); | |
| 80 | if (IS_ERR(ldev)) { | |
| 81 | dev_err(dev, "failed to register LCD\n"); | |
| 82 | return PTR_ERR(ldev); | |
| 83 | } | |
| 84 | ldev->props.max_contrast = 0x0ff; | |
| 85 | data->lcd_contrast = 0xe5; | |
| 86 | data->lcd = ldev; | |
| 87 | picolcd_set_contrast(ldev, 0xe5); | |
| 88 | return 0; | |
| 89 | } | |
| 90 | ||
| 91 | void picolcd_exit_lcd(struct picolcd_data *data) | |
| 92 | { | |
| 93 | struct lcd_device *ldev = data->lcd; | |
| 94 | ||
| 95 | data->lcd = NULL; | |
| 96 | if (ldev) | |
| 97 | lcd_device_unregister(ldev); | |
| 98 | } | |
| 99 | ||
| 100 | int picolcd_resume_lcd(struct picolcd_data *data) | |
| 101 | { | |
| 102 | if (!data->lcd) | |
| 103 | return 0; | |
| 104 | return picolcd_set_contrast(data->lcd, data->lcd_contrast); | |
| 105 | } | |
| 106 |