// SPDX-License-Identifier: GPL-2.0-only /*************************************************************************** * 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> * * * ***************************************************************************/ #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; 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); }