projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 24c9d96d | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| fabdbf2f BP |
2 | /*************************************************************************** |
| 3 | * Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org> * | |
| 4 | * * | |
| 5 | * Based on Logitech G13 driver (v0.4) * | |
| 6 | * Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu> * | |
| 7 | * * | |
| fabdbf2f BP |
8 | ***************************************************************************/ |
| 9 | ||
| 10 | #include <linux/hid.h> | |
| fabdbf2f BP |
11 | |
| 12 | #include <linux/fb.h> | |
| 13 | #include <linux/lcd.h> | |
| 14 | ||
| 15 | #include "hid-picolcd.h" | |
| 16 | ||
| 17 | /* | |
| 18 | * lcd class device | |
| 19 | */ | |
| 20 | static int picolcd_get_contrast(struct lcd_device *ldev) | |
| 21 | { | |
| 22 | struct picolcd_data *data = lcd_get_data(ldev); | |
| 23 | return data->lcd_contrast; | |
| 24 | } | |
| 25 | ||
| 26 | static int picolcd_set_contrast(struct lcd_device *ldev, int contrast) | |
| 27 | { | |
| 28 | struct picolcd_data *data = lcd_get_data(ldev); | |
| 29 | struct hid_report *report = picolcd_out_report(REPORT_CONTRAST, data->hdev); | |
| 30 | unsigned long flags; | |
| 31 | ||
| 32 | if (!report || report->maxfield != 1 || report->field[0]->report_count != 1) | |
| 33 | return -ENODEV; | |
| 34 | ||
| 35 | data->lcd_contrast = contrast & 0x0ff; | |
| 36 | spin_lock_irqsave(&data->lock, flags); | |
| 37 | hid_set_field(report->field[0], 0, data->lcd_contrast); | |
| a93ab849 | 38 | if (!(data->status & PICOLCD_FAILED)) |
| d8814272 | 39 | hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT); |
| fabdbf2f BP |
40 | spin_unlock_irqrestore(&data->lock, flags); |
| 41 | return 0; | |
| 42 | } | |
| 43 | ||
| 44 | static int picolcd_check_lcd_fb(struct lcd_device *ldev, struct fb_info *fb) | |
| 45 | { | |
| 46 | return fb && fb == picolcd_fbinfo((struct picolcd_data *)lcd_get_data(ldev)); | |
| 47 | } | |
| 48 | ||
| 49 | static struct lcd_ops picolcd_lcdops = { | |
| 50 | .get_contrast = picolcd_get_contrast, | |
| 51 | .set_contrast = picolcd_set_contrast, | |
| 52 | .check_fb = picolcd_check_lcd_fb, | |
| 53 | }; | |
| 54 | ||
| 55 | int picolcd_init_lcd(struct picolcd_data *data, struct hid_report *report) | |
| 56 | { | |
| 57 | struct device *dev = &data->hdev->dev; | |
| 58 | struct lcd_device *ldev; | |
| 59 | ||
| 60 | if (!report) | |
| 61 | return -ENODEV; | |
| 62 | if (report->maxfield != 1 || report->field[0]->report_count != 1 || | |
| 63 | report->field[0]->report_size != 8) { | |
| 64 | dev_err(dev, "unsupported CONTRAST report"); | |
| 65 | return -EINVAL; | |
| 66 | } | |
| 67 | ||
| 68 | ldev = lcd_device_register(dev_name(dev), dev, data, &picolcd_lcdops); | |
| 69 | if (IS_ERR(ldev)) { | |
| 70 | dev_err(dev, "failed to register LCD\n"); | |
| 71 | return PTR_ERR(ldev); | |
| 72 | } | |
| 73 | ldev->props.max_contrast = 0x0ff; | |
| 74 | data->lcd_contrast = 0xe5; | |
| 75 | data->lcd = ldev; | |
| 76 | picolcd_set_contrast(ldev, 0xe5); | |
| 77 | return 0; | |
| 78 | } | |
| 79 | ||
| 80 | void picolcd_exit_lcd(struct picolcd_data *data) | |
| 81 | { | |
| 82 | struct lcd_device *ldev = data->lcd; | |
| 83 | ||
| 84 | data->lcd = NULL; | |
| 4b8a8262 | 85 | lcd_device_unregister(ldev); |
| fabdbf2f BP |
86 | } |
| 87 | ||
| 88 | int picolcd_resume_lcd(struct picolcd_data *data) | |
| 89 | { | |
| 90 | if (!data->lcd) | |
| 91 | return 0; | |
| 92 | return picolcd_set_contrast(data->lcd, data->lcd_contrast); | |
| 93 | } | |
| 94 |