mirror of https://gitee.com/openkylin/linux.git
staging: fbtft: add fb_watterott driver
This commit adds the fb_watterott driver from the fbtft project at https://github.com/notro/fbtft. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Noralf Tronnes <notro@tronnes.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Petazzoni
Greg Kroah-Hartman
parent
ef0459c7f4
commit
1e7d51c685
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@ -151,3 +151,9 @@ config FB_TFT_UPD161704
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depends on FB_TFT
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help
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Generic Framebuffer support for uPD161704
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config FB_TFT_WATTEROTT
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tristate "FB driver for the WATTEROTT LCD Controller"
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depends on FB_TFT
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help
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Generic Framebuffer support for WATTEROTT
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@ -27,3 +27,4 @@ obj-$(CONFIG_FB_TFT_TINYLCD) += fb_tinylcd.o
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obj-$(CONFIG_FB_TFT_TLS8204) += fb_tls8204.o
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obj-$(CONFIG_FB_TFT_UC1701) += fb_uc1701.o
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obj-$(CONFIG_FB_TFT_UPD161704) += fb_upd161704.o
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obj-$(CONFIG_FB_TFT_WATTEROTT) += fb_watterott.o
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@ -0,0 +1,324 @@
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/*
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* FB driver for the Watterott LCD Controller
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*
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* Copyright (C) 2013 Noralf Tronnes
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/gpio.h>
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#include <linux/delay.h>
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#include "fbtft.h"
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#define DRVNAME "fb_watterott"
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#define WIDTH 320
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#define HEIGHT 240
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#define FPS 5
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#define TXBUFLEN 1024
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#define DEFAULT_BRIGHTNESS 50
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#define CMD_VERSION 0x01
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#define CMD_LCD_LED 0x10
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#define CMD_LCD_RESET 0x11
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#define CMD_LCD_ORIENTATION 0x20
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#define CMD_LCD_DRAWIMAGE 0x27
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#define COLOR_RGB323 8
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#define COLOR_RGB332 9
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#define COLOR_RGB233 10
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#define COLOR_RGB565 16
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static short mode = 565;
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module_param(mode, short, 0);
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MODULE_PARM_DESC(mode, "RGB color transfer mode: 332, 565 (default)");
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static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
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{
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va_list args;
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int i, ret;
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u8 *buf = par->buf;
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va_start(args, len);
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for (i = 0; i < len; i++)
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*buf++ = (u8)va_arg(args, unsigned int);
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va_end(args);
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fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par,
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par->info->device, u8, par->buf, len, "%s: ", __func__);
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ret = par->fbtftops.write(par, par->buf, len);
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if (ret < 0) {
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dev_err(par->info->device,
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"%s: write() failed and returned %d\n", __func__, ret);
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return;
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}
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}
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static int write_vmem(struct fbtft_par *par, size_t offset, size_t len)
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{
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unsigned start_line, end_line;
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u16 *vmem16 = (u16 *)(par->info->screen_base + offset);
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u16 *pos = par->txbuf.buf + 1;
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u16 *buf16 = par->txbuf.buf + 10;
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int i, j;
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int ret = 0;
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fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s()\n", __func__);
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start_line = offset / par->info->fix.line_length;
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end_line = start_line + (len / par->info->fix.line_length) - 1;
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/* Set command header. pos: x, y, w, h */
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((u8 *)par->txbuf.buf)[0] = CMD_LCD_DRAWIMAGE;
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pos[0] = 0;
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pos[2] = cpu_to_be16(par->info->var.xres);
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pos[3] = cpu_to_be16(1);
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((u8 *)par->txbuf.buf)[9] = COLOR_RGB565;
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for (i = start_line; i <= end_line; i++) {
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pos[1] = cpu_to_be16(i);
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for (j = 0; j < par->info->var.xres; j++)
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buf16[j] = cpu_to_be16(*vmem16++);
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ret = par->fbtftops.write(par,
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par->txbuf.buf, 10 + par->info->fix.line_length);
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if (ret < 0)
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return ret;
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udelay(300);
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}
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return 0;
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}
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#define RGB565toRGB323(c) (((c&0xE000)>>8) | ((c&0600)>>6) | ((c&0x001C)>>2))
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#define RGB565toRGB332(c) (((c&0xE000)>>8) | ((c&0700)>>6) | ((c&0x0018)>>3))
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#define RGB565toRGB233(c) (((c&0xC000)>>8) | ((c&0700)>>5) | ((c&0x001C)>>2))
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static int write_vmem_8bit(struct fbtft_par *par, size_t offset, size_t len)
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{
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unsigned start_line, end_line;
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u16 *vmem16 = (u16 *)(par->info->screen_base + offset);
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u16 *pos = par->txbuf.buf + 1;
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u8 *buf8 = par->txbuf.buf + 10;
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int i, j;
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int ret = 0;
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fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s()\n", __func__);
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start_line = offset / par->info->fix.line_length;
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end_line = start_line + (len / par->info->fix.line_length) - 1;
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/* Set command header. pos: x, y, w, h */
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((u8 *)par->txbuf.buf)[0] = CMD_LCD_DRAWIMAGE;
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pos[0] = 0;
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pos[2] = cpu_to_be16(par->info->var.xres);
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pos[3] = cpu_to_be16(1);
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((u8 *)par->txbuf.buf)[9] = COLOR_RGB332;
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for (i = start_line; i <= end_line; i++) {
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pos[1] = cpu_to_be16(i);
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for (j = 0; j < par->info->var.xres; j++) {
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buf8[j] = RGB565toRGB332(*vmem16);
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vmem16++;
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}
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ret = par->fbtftops.write(par,
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par->txbuf.buf, 10 + par->info->var.xres);
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if (ret < 0)
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return ret;
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udelay(700);
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}
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return 0;
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}
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static unsigned firmware_version(struct fbtft_par *par)
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{
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u8 rxbuf[4] = {0, };
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write_reg(par, CMD_VERSION);
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par->fbtftops.read(par, rxbuf, 4);
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if (rxbuf[1] != '.')
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return 0;
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return (rxbuf[0] - '0') << 8 | (rxbuf[2] - '0') << 4 | (rxbuf[3] - '0');
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}
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static int init_display(struct fbtft_par *par)
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{
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int ret;
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unsigned version;
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u8 save_mode;
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fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
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/* enable SPI interface by having CS and MOSI low during reset */
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save_mode = par->spi->mode;
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par->spi->mode |= SPI_CS_HIGH;
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ret = par->spi->master->setup(par->spi); /* set CS inactive low */
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if (ret) {
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dev_err(par->info->device, "Could not set SPI_CS_HIGH\n");
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return ret;
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}
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write_reg(par, 0x00); /* make sure mode is set */
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mdelay(50);
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par->fbtftops.reset(par);
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mdelay(1000);
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par->spi->mode = save_mode;
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ret = par->spi->master->setup(par->spi);
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if (ret) {
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dev_err(par->info->device, "Could not restore SPI mode\n");
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return ret;
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}
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write_reg(par, 0x00);
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version = firmware_version(par);
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fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "Firmware version: %x.%02x\n",
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version >> 8, version & 0xFF);
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if (mode == 332)
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par->fbtftops.write_vmem = write_vmem_8bit;
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return 0;
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}
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static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
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{
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/* not used on this controller */
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}
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static int set_var(struct fbtft_par *par)
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{
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u8 rotate;
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fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
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/* this controller rotates clock wise */
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switch (par->info->var.rotate) {
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case 90:
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rotate = 27;
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break;
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case 180:
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rotate = 18;
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break;
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case 270:
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rotate = 9;
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break;
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default:
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rotate = 0;
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}
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write_reg(par, CMD_LCD_ORIENTATION, rotate);
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return 0;
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}
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static int verify_gpios(struct fbtft_par *par)
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{
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if (par->gpio.reset < 0) {
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dev_err(par->info->device, "Missing 'reset' gpio. Aborting.\n");
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return -EINVAL;
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}
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return 0;
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}
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#ifdef CONFIG_FB_BACKLIGHT
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static int backlight_chip_update_status(struct backlight_device *bd)
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{
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struct fbtft_par *par = bl_get_data(bd);
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int brightness = bd->props.brightness;
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fbtft_par_dbg(DEBUG_BACKLIGHT, par,
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"%s: brightness=%d, power=%d, fb_blank=%d\n",
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__func__, bd->props.brightness, bd->props.power,
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bd->props.fb_blank);
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if (bd->props.power != FB_BLANK_UNBLANK)
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brightness = 0;
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if (bd->props.fb_blank != FB_BLANK_UNBLANK)
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brightness = 0;
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write_reg(par, CMD_LCD_LED, brightness);
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return 0;
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}
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static void register_chip_backlight(struct fbtft_par *par)
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{
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struct backlight_device *bd;
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struct backlight_properties bl_props = { 0, };
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struct backlight_ops *bl_ops;
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fbtft_par_dbg(DEBUG_BACKLIGHT, par, "%s()\n", __func__);
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bl_ops = devm_kzalloc(par->info->device, sizeof(struct backlight_ops),
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GFP_KERNEL);
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if (!bl_ops) {
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dev_err(par->info->device,
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"%s: could not allocate memory for backlight operations.\n",
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__func__);
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return;
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}
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bl_ops->update_status = backlight_chip_update_status;
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bl_props.type = BACKLIGHT_RAW;
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bl_props.power = FB_BLANK_POWERDOWN;
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bl_props.max_brightness = 100;
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bl_props.brightness = DEFAULT_BRIGHTNESS;
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bd = backlight_device_register(dev_driver_string(par->info->device),
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par->info->device, par, bl_ops, &bl_props);
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if (IS_ERR(bd)) {
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dev_err(par->info->device,
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"cannot register backlight device (%ld)\n",
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PTR_ERR(bd));
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return;
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}
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par->info->bl_dev = bd;
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if (!par->fbtftops.unregister_backlight)
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par->fbtftops.unregister_backlight = fbtft_unregister_backlight;
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}
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#else
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#define register_chip_backlight NULL
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#endif
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static struct fbtft_display display = {
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.regwidth = 8,
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.buswidth = 8,
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.width = WIDTH,
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.height = HEIGHT,
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.fps = FPS,
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.txbuflen = TXBUFLEN,
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.fbtftops = {
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.write_register = write_reg8_bus8,
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.write_vmem = write_vmem,
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.init_display = init_display,
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.set_addr_win = set_addr_win,
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.set_var = set_var,
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.verify_gpios = verify_gpios,
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.register_backlight = register_chip_backlight,
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},
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};
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FBTFT_REGISTER_DRIVER(DRVNAME, "watterott,openlcd", &display);
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MODULE_ALIAS("spi:" DRVNAME);
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MODULE_DESCRIPTION("FB driver for the Watterott LCD Controller");
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MODULE_AUTHOR("Noralf Tronnes");
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MODULE_LICENSE("GPL");
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