606 lines
16 KiB
C
606 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/***************************************************************************
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* Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org> *
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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. <rvinyard@cs.nmsu.edu> *
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* *
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***************************************************************************/
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#include <linux/hid.h>
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#include <linux/vmalloc.h>
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#include <linux/fb.h>
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#include <linux/module.h>
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#include "hid-picolcd.h"
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/* Framebuffer
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*
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* The PicoLCD use a Topway LCD module of 256x64 pixel
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* This display area is tiled over 4 controllers with 8 tiles
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* each. Each tile has 8x64 pixel, each data byte representing
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* a 1-bit wide vertical line of the tile.
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*
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* The display can be updated at a tile granularity.
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*
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* Chip 1 Chip 2 Chip 3 Chip 4
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* +----------------+----------------+----------------+----------------+
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* | Tile 1 | Tile 1 | Tile 1 | Tile 1 |
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* +----------------+----------------+----------------+----------------+
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* | Tile 2 | Tile 2 | Tile 2 | Tile 2 |
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* +----------------+----------------+----------------+----------------+
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* ...
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* +----------------+----------------+----------------+----------------+
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* | Tile 8 | Tile 8 | Tile 8 | Tile 8 |
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* +----------------+----------------+----------------+----------------+
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*/
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#define PICOLCDFB_NAME "picolcdfb"
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#define PICOLCDFB_WIDTH (256)
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#define PICOLCDFB_HEIGHT (64)
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#define PICOLCDFB_SIZE (PICOLCDFB_WIDTH * PICOLCDFB_HEIGHT / 8)
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#define PICOLCDFB_UPDATE_RATE_LIMIT 10
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#define PICOLCDFB_UPDATE_RATE_DEFAULT 2
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/* Framebuffer visual structures */
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static const struct fb_fix_screeninfo picolcdfb_fix = {
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.id = PICOLCDFB_NAME,
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_MONO01,
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.xpanstep = 0,
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.ypanstep = 0,
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.ywrapstep = 0,
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.line_length = PICOLCDFB_WIDTH / 8,
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.accel = FB_ACCEL_NONE,
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};
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static const struct fb_var_screeninfo picolcdfb_var = {
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.xres = PICOLCDFB_WIDTH,
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.yres = PICOLCDFB_HEIGHT,
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.xres_virtual = PICOLCDFB_WIDTH,
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.yres_virtual = PICOLCDFB_HEIGHT,
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.width = 103,
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.height = 26,
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.bits_per_pixel = 1,
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.grayscale = 1,
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.red = {
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.offset = 0,
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.length = 1,
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.msb_right = 0,
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},
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.green = {
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.offset = 0,
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.length = 1,
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.msb_right = 0,
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},
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.blue = {
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.offset = 0,
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.length = 1,
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.msb_right = 0,
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},
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.transp = {
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.offset = 0,
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.length = 0,
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.msb_right = 0,
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},
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};
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/* Send a given tile to PicoLCD */
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static int picolcd_fb_send_tile(struct picolcd_data *data, u8 *vbitmap,
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int chip, int tile)
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{
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struct hid_report *report1, *report2;
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unsigned long flags;
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u8 *tdata;
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int i;
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report1 = picolcd_out_report(REPORT_LCD_CMD_DATA, data->hdev);
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if (!report1 || report1->maxfield != 1)
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return -ENODEV;
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report2 = picolcd_out_report(REPORT_LCD_DATA, data->hdev);
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if (!report2 || report2->maxfield != 1)
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return -ENODEV;
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spin_lock_irqsave(&data->lock, flags);
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if ((data->status & PICOLCD_FAILED)) {
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spin_unlock_irqrestore(&data->lock, flags);
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return -ENODEV;
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}
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hid_set_field(report1->field[0], 0, chip << 2);
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hid_set_field(report1->field[0], 1, 0x02);
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hid_set_field(report1->field[0], 2, 0x00);
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hid_set_field(report1->field[0], 3, 0x00);
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hid_set_field(report1->field[0], 4, 0xb8 | tile);
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hid_set_field(report1->field[0], 5, 0x00);
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hid_set_field(report1->field[0], 6, 0x00);
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hid_set_field(report1->field[0], 7, 0x40);
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hid_set_field(report1->field[0], 8, 0x00);
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hid_set_field(report1->field[0], 9, 0x00);
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hid_set_field(report1->field[0], 10, 32);
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hid_set_field(report2->field[0], 0, (chip << 2) | 0x01);
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hid_set_field(report2->field[0], 1, 0x00);
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hid_set_field(report2->field[0], 2, 0x00);
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hid_set_field(report2->field[0], 3, 32);
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tdata = vbitmap + (tile * 4 + chip) * 64;
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for (i = 0; i < 64; i++)
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if (i < 32)
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hid_set_field(report1->field[0], 11 + i, tdata[i]);
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else
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hid_set_field(report2->field[0], 4 + i - 32, tdata[i]);
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hid_hw_request(data->hdev, report1, HID_REQ_SET_REPORT);
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hid_hw_request(data->hdev, report2, 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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/* Translate a single tile*/
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static int picolcd_fb_update_tile(u8 *vbitmap, const u8 *bitmap, int bpp,
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int chip, int tile)
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{
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int i, b, changed = 0;
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u8 tdata[64];
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u8 *vdata = vbitmap + (tile * 4 + chip) * 64;
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if (bpp == 1) {
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for (b = 7; b >= 0; b--) {
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const u8 *bdata = bitmap + tile * 256 + chip * 8 + b * 32;
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for (i = 0; i < 64; i++) {
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tdata[i] <<= 1;
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tdata[i] |= (bdata[i/8] >> (i % 8)) & 0x01;
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}
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}
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} else if (bpp == 8) {
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for (b = 7; b >= 0; b--) {
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const u8 *bdata = bitmap + (tile * 256 + chip * 8 + b * 32) * 8;
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for (i = 0; i < 64; i++) {
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tdata[i] <<= 1;
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tdata[i] |= (bdata[i] & 0x80) ? 0x01 : 0x00;
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}
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}
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} else {
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/* Oops, we should never get here! */
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WARN_ON(1);
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return 0;
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}
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for (i = 0; i < 64; i++)
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if (tdata[i] != vdata[i]) {
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changed = 1;
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vdata[i] = tdata[i];
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}
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return changed;
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}
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void picolcd_fb_refresh(struct picolcd_data *data)
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{
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if (data->fb_info)
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schedule_delayed_work(&data->fb_info->deferred_work, 0);
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}
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/* Reconfigure LCD display */
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int picolcd_fb_reset(struct picolcd_data *data, int clear)
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{
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struct hid_report *report = picolcd_out_report(REPORT_LCD_CMD, data->hdev);
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struct picolcd_fb_data *fbdata = data->fb_info->par;
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int i, j;
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unsigned long flags;
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static const u8 mapcmd[8] = { 0x00, 0x02, 0x00, 0x64, 0x3f, 0x00, 0x64, 0xc0 };
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if (!report || report->maxfield != 1)
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return -ENODEV;
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spin_lock_irqsave(&data->lock, flags);
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for (i = 0; i < 4; i++) {
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for (j = 0; j < report->field[0]->maxusage; j++)
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if (j == 0)
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hid_set_field(report->field[0], j, i << 2);
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else if (j < sizeof(mapcmd))
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hid_set_field(report->field[0], j, mapcmd[j]);
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else
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hid_set_field(report->field[0], j, 0);
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hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT);
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}
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spin_unlock_irqrestore(&data->lock, flags);
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if (clear) {
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memset(fbdata->vbitmap, 0, PICOLCDFB_SIZE);
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memset(fbdata->bitmap, 0, PICOLCDFB_SIZE*fbdata->bpp);
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}
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fbdata->force = 1;
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/* schedule first output of framebuffer */
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if (fbdata->ready)
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schedule_delayed_work(&data->fb_info->deferred_work, 0);
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else
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fbdata->ready = 1;
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return 0;
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}
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/* Update fb_vbitmap from the screen_base and send changed tiles to device */
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static void picolcd_fb_update(struct fb_info *info)
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{
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int chip, tile, n;
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unsigned long flags;
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struct picolcd_fb_data *fbdata = info->par;
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struct picolcd_data *data;
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mutex_lock(&info->lock);
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spin_lock_irqsave(&fbdata->lock, flags);
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if (!fbdata->ready && fbdata->picolcd)
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picolcd_fb_reset(fbdata->picolcd, 0);
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spin_unlock_irqrestore(&fbdata->lock, flags);
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/*
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* Translate the framebuffer into the format needed by the PicoLCD.
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* See display layout above.
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* Do this one tile after the other and push those tiles that changed.
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*
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* Wait for our IO to complete as otherwise we might flood the queue!
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*/
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n = 0;
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for (chip = 0; chip < 4; chip++)
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for (tile = 0; tile < 8; tile++) {
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if (!fbdata->force && !picolcd_fb_update_tile(
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fbdata->vbitmap, fbdata->bitmap,
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fbdata->bpp, chip, tile))
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continue;
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n += 2;
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if (n >= HID_OUTPUT_FIFO_SIZE / 2) {
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spin_lock_irqsave(&fbdata->lock, flags);
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data = fbdata->picolcd;
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spin_unlock_irqrestore(&fbdata->lock, flags);
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mutex_unlock(&info->lock);
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if (!data)
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return;
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hid_hw_wait(data->hdev);
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mutex_lock(&info->lock);
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n = 0;
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}
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spin_lock_irqsave(&fbdata->lock, flags);
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data = fbdata->picolcd;
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spin_unlock_irqrestore(&fbdata->lock, flags);
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if (!data || picolcd_fb_send_tile(data,
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fbdata->vbitmap, chip, tile))
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goto out;
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}
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fbdata->force = false;
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if (n) {
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spin_lock_irqsave(&fbdata->lock, flags);
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data = fbdata->picolcd;
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spin_unlock_irqrestore(&fbdata->lock, flags);
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mutex_unlock(&info->lock);
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if (data)
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hid_hw_wait(data->hdev);
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return;
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}
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out:
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mutex_unlock(&info->lock);
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}
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/* Stub to call the system default and update the image on the picoLCD */
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static void picolcd_fb_fillrect(struct fb_info *info,
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const struct fb_fillrect *rect)
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{
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if (!info->par)
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return;
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sys_fillrect(info, rect);
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schedule_delayed_work(&info->deferred_work, 0);
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}
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/* Stub to call the system default and update the image on the picoLCD */
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static void picolcd_fb_copyarea(struct fb_info *info,
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const struct fb_copyarea *area)
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{
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if (!info->par)
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return;
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sys_copyarea(info, area);
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schedule_delayed_work(&info->deferred_work, 0);
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}
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/* Stub to call the system default and update the image on the picoLCD */
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static void picolcd_fb_imageblit(struct fb_info *info, const struct fb_image *image)
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{
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if (!info->par)
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return;
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sys_imageblit(info, image);
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schedule_delayed_work(&info->deferred_work, 0);
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}
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/*
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* this is the slow path from userspace. they can seek and write to
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* the fb. it's inefficient to do anything less than a full screen draw
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*/
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static ssize_t picolcd_fb_write(struct fb_info *info, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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ssize_t ret;
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if (!info->par)
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return -ENODEV;
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ret = fb_sys_write(info, buf, count, ppos);
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if (ret >= 0)
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schedule_delayed_work(&info->deferred_work, 0);
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return ret;
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}
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static int picolcd_fb_blank(int blank, struct fb_info *info)
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{
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/* We let fb notification do this for us via lcd/backlight device */
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return 0;
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}
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static void picolcd_fb_destroy(struct fb_info *info)
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{
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struct picolcd_fb_data *fbdata = info->par;
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/* make sure no work is deferred */
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fb_deferred_io_cleanup(info);
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/* No thridparty should ever unregister our framebuffer! */
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WARN_ON(fbdata->picolcd != NULL);
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vfree((u8 *)info->fix.smem_start);
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framebuffer_release(info);
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}
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static int picolcd_fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
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{
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__u32 bpp = var->bits_per_pixel;
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__u32 activate = var->activate;
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/* only allow 1/8 bit depth (8-bit is grayscale) */
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*var = picolcdfb_var;
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var->activate = activate;
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if (bpp >= 8) {
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var->bits_per_pixel = 8;
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var->red.length = 8;
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var->green.length = 8;
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var->blue.length = 8;
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} else {
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var->bits_per_pixel = 1;
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var->red.length = 1;
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var->green.length = 1;
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var->blue.length = 1;
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}
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return 0;
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}
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static int picolcd_set_par(struct fb_info *info)
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{
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struct picolcd_fb_data *fbdata = info->par;
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u8 *tmp_fb, *o_fb;
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if (info->var.bits_per_pixel == fbdata->bpp)
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return 0;
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/* switch between 1/8 bit depths */
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if (info->var.bits_per_pixel != 1 && info->var.bits_per_pixel != 8)
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return -EINVAL;
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o_fb = fbdata->bitmap;
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tmp_fb = kmalloc_array(PICOLCDFB_SIZE, info->var.bits_per_pixel,
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GFP_KERNEL);
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if (!tmp_fb)
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return -ENOMEM;
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/* translate FB content to new bits-per-pixel */
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if (info->var.bits_per_pixel == 1) {
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int i, b;
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for (i = 0; i < PICOLCDFB_SIZE; i++) {
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u8 p = 0;
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for (b = 0; b < 8; b++) {
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p <<= 1;
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p |= o_fb[i*8+b] ? 0x01 : 0x00;
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}
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tmp_fb[i] = p;
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}
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memcpy(o_fb, tmp_fb, PICOLCDFB_SIZE);
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info->fix.visual = FB_VISUAL_MONO01;
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info->fix.line_length = PICOLCDFB_WIDTH / 8;
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} else {
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int i;
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memcpy(tmp_fb, o_fb, PICOLCDFB_SIZE);
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for (i = 0; i < PICOLCDFB_SIZE * 8; i++)
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o_fb[i] = tmp_fb[i/8] & (0x01 << (7 - i % 8)) ? 0xff : 0x00;
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info->fix.visual = FB_VISUAL_DIRECTCOLOR;
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info->fix.line_length = PICOLCDFB_WIDTH;
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}
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kfree(tmp_fb);
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fbdata->bpp = info->var.bits_per_pixel;
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return 0;
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}
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static const struct fb_ops picolcdfb_ops = {
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.owner = THIS_MODULE,
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.fb_destroy = picolcd_fb_destroy,
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.fb_read = fb_sys_read,
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.fb_write = picolcd_fb_write,
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.fb_blank = picolcd_fb_blank,
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.fb_fillrect = picolcd_fb_fillrect,
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.fb_copyarea = picolcd_fb_copyarea,
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.fb_imageblit = picolcd_fb_imageblit,
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.fb_check_var = picolcd_fb_check_var,
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.fb_set_par = picolcd_set_par,
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};
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/* Callback from deferred IO workqueue */
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static void picolcd_fb_deferred_io(struct fb_info *info, struct list_head *pagelist)
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{
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picolcd_fb_update(info);
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}
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static const struct fb_deferred_io picolcd_fb_defio = {
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.delay = HZ / PICOLCDFB_UPDATE_RATE_DEFAULT,
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.deferred_io = picolcd_fb_deferred_io,
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};
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/*
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* The "fb_update_rate" sysfs attribute
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*/
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static ssize_t picolcd_fb_update_rate_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct picolcd_data *data = dev_get_drvdata(dev);
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struct picolcd_fb_data *fbdata = data->fb_info->par;
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unsigned i, fb_update_rate = fbdata->update_rate;
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size_t ret = 0;
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for (i = 1; i <= PICOLCDFB_UPDATE_RATE_LIMIT; i++)
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if (ret >= PAGE_SIZE)
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break;
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else if (i == fb_update_rate)
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ret += snprintf(buf+ret, PAGE_SIZE-ret, "[%u] ", i);
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else
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ret += snprintf(buf+ret, PAGE_SIZE-ret, "%u ", i);
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if (ret > 0)
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buf[min(ret, (size_t)PAGE_SIZE)-1] = '\n';
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return ret;
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}
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static ssize_t picolcd_fb_update_rate_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct picolcd_data *data = dev_get_drvdata(dev);
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struct picolcd_fb_data *fbdata = data->fb_info->par;
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int i;
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unsigned u;
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if (count < 1 || count > 10)
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return -EINVAL;
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i = sscanf(buf, "%u", &u);
|
|
if (i != 1)
|
|
return -EINVAL;
|
|
|
|
if (u > PICOLCDFB_UPDATE_RATE_LIMIT)
|
|
return -ERANGE;
|
|
else if (u == 0)
|
|
u = PICOLCDFB_UPDATE_RATE_DEFAULT;
|
|
|
|
fbdata->update_rate = u;
|
|
data->fb_info->fbdefio->delay = HZ / fbdata->update_rate;
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(fb_update_rate, 0664, picolcd_fb_update_rate_show,
|
|
picolcd_fb_update_rate_store);
|
|
|
|
/* initialize Framebuffer device */
|
|
int picolcd_init_framebuffer(struct picolcd_data *data)
|
|
{
|
|
struct device *dev = &data->hdev->dev;
|
|
struct fb_info *info = NULL;
|
|
struct picolcd_fb_data *fbdata = NULL;
|
|
int i, error = -ENOMEM;
|
|
u32 *palette;
|
|
|
|
/* The extra memory is:
|
|
* - 256*u32 for pseudo_palette
|
|
* - struct fb_deferred_io
|
|
*/
|
|
info = framebuffer_alloc(256 * sizeof(u32) +
|
|
sizeof(struct fb_deferred_io) +
|
|
sizeof(struct picolcd_fb_data) +
|
|
PICOLCDFB_SIZE, dev);
|
|
if (!info)
|
|
goto err_nomem;
|
|
|
|
info->fbdefio = info->par;
|
|
*info->fbdefio = picolcd_fb_defio;
|
|
info->par += sizeof(struct fb_deferred_io);
|
|
palette = info->par;
|
|
info->par += 256 * sizeof(u32);
|
|
for (i = 0; i < 256; i++)
|
|
palette[i] = i > 0 && i < 16 ? 0xff : 0;
|
|
info->pseudo_palette = palette;
|
|
info->fbops = &picolcdfb_ops;
|
|
info->var = picolcdfb_var;
|
|
info->fix = picolcdfb_fix;
|
|
info->fix.smem_len = PICOLCDFB_SIZE*8;
|
|
info->flags = FBINFO_FLAG_DEFAULT;
|
|
|
|
fbdata = info->par;
|
|
spin_lock_init(&fbdata->lock);
|
|
fbdata->picolcd = data;
|
|
fbdata->update_rate = PICOLCDFB_UPDATE_RATE_DEFAULT;
|
|
fbdata->bpp = picolcdfb_var.bits_per_pixel;
|
|
fbdata->force = 1;
|
|
fbdata->vbitmap = info->par + sizeof(struct picolcd_fb_data);
|
|
fbdata->bitmap = vmalloc(PICOLCDFB_SIZE*8);
|
|
if (fbdata->bitmap == NULL) {
|
|
dev_err(dev, "can't get a free page for framebuffer\n");
|
|
goto err_nomem;
|
|
}
|
|
info->screen_base = (char __force __iomem *)fbdata->bitmap;
|
|
info->fix.smem_start = (unsigned long)fbdata->bitmap;
|
|
memset(fbdata->vbitmap, 0xff, PICOLCDFB_SIZE);
|
|
data->fb_info = info;
|
|
|
|
error = picolcd_fb_reset(data, 1);
|
|
if (error) {
|
|
dev_err(dev, "failed to configure display\n");
|
|
goto err_cleanup;
|
|
}
|
|
|
|
error = device_create_file(dev, &dev_attr_fb_update_rate);
|
|
if (error) {
|
|
dev_err(dev, "failed to create sysfs attributes\n");
|
|
goto err_cleanup;
|
|
}
|
|
|
|
fb_deferred_io_init(info);
|
|
error = register_framebuffer(info);
|
|
if (error) {
|
|
dev_err(dev, "failed to register framebuffer\n");
|
|
goto err_sysfs;
|
|
}
|
|
return 0;
|
|
|
|
err_sysfs:
|
|
device_remove_file(dev, &dev_attr_fb_update_rate);
|
|
fb_deferred_io_cleanup(info);
|
|
err_cleanup:
|
|
data->fb_info = NULL;
|
|
|
|
err_nomem:
|
|
if (fbdata)
|
|
vfree(fbdata->bitmap);
|
|
framebuffer_release(info);
|
|
return error;
|
|
}
|
|
|
|
void picolcd_exit_framebuffer(struct picolcd_data *data)
|
|
{
|
|
struct fb_info *info = data->fb_info;
|
|
struct picolcd_fb_data *fbdata;
|
|
unsigned long flags;
|
|
|
|
if (!info)
|
|
return;
|
|
|
|
device_remove_file(&data->hdev->dev, &dev_attr_fb_update_rate);
|
|
fbdata = info->par;
|
|
|
|
/* disconnect framebuffer from HID dev */
|
|
spin_lock_irqsave(&fbdata->lock, flags);
|
|
fbdata->picolcd = NULL;
|
|
spin_unlock_irqrestore(&fbdata->lock, flags);
|
|
|
|
/* make sure there is no running update - thus that fbdata->picolcd
|
|
* once obtained under lock is guaranteed not to get free() under
|
|
* the feet of the deferred work */
|
|
flush_delayed_work(&info->deferred_work);
|
|
|
|
data->fb_info = NULL;
|
|
unregister_framebuffer(info);
|
|
}
|