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94 lines
2.7 KiB
94 lines
2.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/*************************************************************************** |
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* Copyright (C) 2010-2012 by Bruno Prémont <[email protected]> * |
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* * |
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* Based on Logitech G13 driver (v0.4) * |
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* Copyright (C) 2009 by Rick L. Vinyard, Jr. <[email protected]> * |
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* * |
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***************************************************************************/ |
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#include <linux/hid.h> |
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#include <linux/fb.h> |
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#include <linux/lcd.h> |
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#include "hid-picolcd.h" |
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/* |
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* lcd class device |
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*/ |
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static int picolcd_get_contrast(struct lcd_device *ldev) |
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{ |
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struct picolcd_data *data = lcd_get_data(ldev); |
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return data->lcd_contrast; |
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} |
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static int picolcd_set_contrast(struct lcd_device *ldev, int contrast) |
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{ |
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struct picolcd_data *data = lcd_get_data(ldev); |
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struct hid_report *report = picolcd_out_report(REPORT_CONTRAST, data->hdev); |
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unsigned long flags; |
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if (!report || report->maxfield != 1 || report->field[0]->report_count != 1) |
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return -ENODEV; |
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data->lcd_contrast = contrast & 0x0ff; |
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spin_lock_irqsave(&data->lock, flags); |
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hid_set_field(report->field[0], 0, data->lcd_contrast); |
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if (!(data->status & PICOLCD_FAILED)) |
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hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT); |
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spin_unlock_irqrestore(&data->lock, flags); |
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return 0; |
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} |
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static int picolcd_check_lcd_fb(struct lcd_device *ldev, struct fb_info *fb) |
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{ |
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return fb && fb == picolcd_fbinfo((struct picolcd_data *)lcd_get_data(ldev)); |
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} |
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static struct lcd_ops picolcd_lcdops = { |
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.get_contrast = picolcd_get_contrast, |
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.set_contrast = picolcd_set_contrast, |
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.check_fb = picolcd_check_lcd_fb, |
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}; |
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int picolcd_init_lcd(struct picolcd_data *data, struct hid_report *report) |
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{ |
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struct device *dev = &data->hdev->dev; |
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struct lcd_device *ldev; |
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if (!report) |
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return -ENODEV; |
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if (report->maxfield != 1 || report->field[0]->report_count != 1 || |
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report->field[0]->report_size != 8) { |
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dev_err(dev, "unsupported CONTRAST report"); |
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return -EINVAL; |
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} |
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ldev = lcd_device_register(dev_name(dev), dev, data, &picolcd_lcdops); |
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if (IS_ERR(ldev)) { |
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dev_err(dev, "failed to register LCD\n"); |
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return PTR_ERR(ldev); |
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} |
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ldev->props.max_contrast = 0x0ff; |
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data->lcd_contrast = 0xe5; |
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data->lcd = ldev; |
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picolcd_set_contrast(ldev, 0xe5); |
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return 0; |
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} |
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void picolcd_exit_lcd(struct picolcd_data *data) |
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{ |
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struct lcd_device *ldev = data->lcd; |
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data->lcd = NULL; |
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lcd_device_unregister(ldev); |
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} |
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int picolcd_resume_lcd(struct picolcd_data *data) |
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{ |
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if (!data->lcd) |
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return 0; |
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return picolcd_set_contrast(data->lcd, data->lcd_contrast); |
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} |
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