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fbtft_device.c
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fbtft_device.c
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/*
*
* Copyright (C) 2013, Noralf Tronnes
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/spi/spi.h>
#include "fbtft.h"
#define DRVNAME "fbtft_device"
#define MAX_GPIOS 32
struct spi_device *spi_device;
struct platform_device *p_device;
static char *name;
module_param(name, charp, 0);
MODULE_PARM_DESC(name, "Devicename (required). " \
"name=list => list all supported devices.");
static unsigned rotate;
module_param(rotate, uint, 0);
MODULE_PARM_DESC(rotate,
"Angle to rotate display counter clockwise: 0, 90, 180, 270");
static unsigned busnum;
module_param(busnum, uint, 0);
MODULE_PARM_DESC(busnum, "SPI bus number (default=0)");
static unsigned cs;
module_param(cs, uint, 0);
MODULE_PARM_DESC(cs, "SPI chip select (default=0)");
static unsigned speed;
module_param(speed, uint, 0);
MODULE_PARM_DESC(speed, "SPI speed (override device default)");
static int mode = -1;
module_param(mode, int, 0);
MODULE_PARM_DESC(mode, "SPI mode (override device default)");
static char *gpios;
module_param(gpios, charp, 0);
MODULE_PARM_DESC(gpios,
"List of gpios. Comma separated with the form: reset:23,dc:24 " \
"(when overriding the default, all gpios must be specified)");
static unsigned fps;
module_param(fps, uint, 0);
MODULE_PARM_DESC(fps, "Frames per second (override driver default)");
static char *gamma;
module_param(gamma, charp, 0);
MODULE_PARM_DESC(gamma,
"String representation of Gamma Curve(s). Driver specific.");
static int txbuflen;
module_param(txbuflen, int, 0);
MODULE_PARM_DESC(txbuflen, "txbuflen (override driver default)");
static int bgr = -1;
module_param(bgr, int, 0);
MODULE_PARM_DESC(bgr,
"BGR bit (supported by some drivers).");
static unsigned startbyte;
module_param(startbyte, uint, 0);
MODULE_PARM_DESC(startbyte, "Sets the Start byte used by some SPI displays.");
static bool custom;
module_param(custom, bool, 0);
MODULE_PARM_DESC(custom, "Add a custom display device. " \
"Use speed= argument to make it a SPI device, else platform_device");
static unsigned width;
module_param(width, uint, 0);
MODULE_PARM_DESC(width, "Display width, used with the custom argument");
static unsigned height;
module_param(height, uint, 0);
MODULE_PARM_DESC(height, "Display height, used with the custom argument");
static unsigned buswidth = 8;
module_param(buswidth, uint, 0);
MODULE_PARM_DESC(buswidth, "Display bus width, used with the custom argument");
static int init[FBTFT_MAX_INIT_SEQUENCE];
static int init_num;
module_param_array(init, int, &init_num, 0);
MODULE_PARM_DESC(init, "Init sequence, used with the custom argument");
static unsigned long debug;
module_param(debug, ulong , 0);
MODULE_PARM_DESC(debug,
"level: 0-7 (the remaining 29 bits is for advanced usage)");
static unsigned verbose = 3;
module_param(verbose, uint, 0);
MODULE_PARM_DESC(verbose,
"0 silent, >0 show gpios, >1 show devices, >2 show devices before (default=3)");
struct fbtft_device_display {
char *name;
struct spi_board_info *spi;
struct platform_device *pdev;
};
static void fbtft_device_pdev_release(struct device *dev);
static int write_gpio16_wr_slow(struct fbtft_par *par, void *buf, size_t len);
static void adafruit18_green_tab_set_addr_win(struct fbtft_par *par,
int xs, int ys, int xe, int ye);
#define ADAFRUIT18_GAMMA \
"02 1c 07 12 37 32 29 2d 29 25 2B 39 00 01 03 10\n" \
"03 1d 07 06 2E 2C 29 2D 2E 2E 37 3F 00 00 02 10"
static int hy28b_init_sequence[] = {
-1,0x00e7,0x0010,-1,0x0000,0x0001,-1,0x0001,0x0100,-1,0x0002,0x0700,
-1,0x0003,0x1030,-1,0x0004,0x0000,-1,0x0008,0x0207,-1,0x0009,0x0000,
-1,0x000a,0x0000,-1,0x000c,0x0001,-1,0x000d,0x0000,-1,0x000f,0x0000,
-1,0x0010,0x0000,-1,0x0011,0x0007,-1,0x0012,0x0000,-1,0x0013,0x0000,
-2,50,-1,0x0010,0x1590,-1,0x0011,0x0227,-2,50,-1,0x0012,0x009c,-2,50,
-1,0x0013,0x1900,-1,0x0029,0x0023,-1,0x002b,0x000e,-2,50,
-1,0x0020,0x0000,-1,0x0021,0x0000,-2,50,-1,0x0050,0x0000,
-1,0x0051,0x00ef,-1,0x0052,0x0000,-1,0x0053,0x013f,-1,0x0060,0xa700,
-1,0x0061,0x0001,-1,0x006a,0x0000,-1,0x0080,0x0000,-1,0x0081,0x0000,
-1,0x0082,0x0000,-1,0x0083,0x0000,-1,0x0084,0x0000,-1,0x0085,0x0000,
-1,0x0090,0x0010,-1,0x0092,0x0000,-1,0x0093,0x0003,-1,0x0095,0x0110,
-1,0x0097,0x0000,-1,0x0098,0x0000,-1,0x0007,0x0133,-1,0x0020,0x0000,
-1,0x0021,0x0000,-2,100,-3 };
#define HY28B_GAMMA \
"04 1F 4 7 7 0 7 7 6 0\n" \
"0F 00 1 7 4 0 0 0 6 7"
static int pitft_init_sequence[] = {
-1,0x01,-2,5,-1,0x28,-1,0xEF,0x03,0x80,0x02,-1,0xCF,0x00,0xC1,0x30,
-1,0xED,0x64,0x03,0x12,0x81,-1,0xE8,0x85,0x00,0x78,
-1,0xCB,0x39,0x2C,0x00,0x34,0x02,-1,0xF7,0x20,-1,0xEA,0x00,0x00,
-1,0xC0,0x23,-1,0xC1,0x10,-1,0xC5,0x3e,0x28,-1,0xC7,0x86,-1,0x3A,0x55,
-1,0xB1,0x00,0x18,-1,0xB6,0x08,0x82,0x27,-1,0xF2,0x00,-1,0x26,0x01,
-1,0xE0,0x0F,0x31,0x2B,0x0C,0x0E,0x08,0x4E,0xF1,0x37,0x07,0x10,0x03,
0x0E,0x09,0x00,-1,0xE1,0x00,0x0E,0x14,0x03,0x11,0x07,0x31,0xC1,0x48,
0x08,0x0F,0x0C,0x31,0x36,0x0F,-1,0x11,-2,100,-1,0x29,-2,20,-3 };
/* Supported displays in alphabetical order */
static struct fbtft_device_display displays[] = {
{
.name = "adafruit18",
.spi = &(struct spi_board_info) {
.modalias = "fb_st7735r",
.max_speed_hz = 32000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
.backlight = 1,
},
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{ "dc", 24 },
{ "led", 18 },
{},
},
.gamma = ADAFRUIT18_GAMMA,
}
}
}, {
.name = "adafruit18_green",
.spi = &(struct spi_board_info) {
.modalias = "fb_st7735r",
.max_speed_hz = 4000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
.backlight = 1,
.fbtftops.set_addr_win = \
adafruit18_green_tab_set_addr_win,
},
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{ "dc", 24 },
{ "led", 18 },
{},
},
.gamma = ADAFRUIT18_GAMMA,
}
}
}, {
.name = "adafruit22",
.spi = &(struct spi_board_info) {
.modalias = "fb_hx8340bn",
.max_speed_hz = 32000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 9,
.backlight = 1,
},
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{ "led", 23 },
{},
},
}
}
}, {
.name = "adafruit22a",
.spi = &(struct spi_board_info) {
.modalias = "fb_ili9340",
.max_speed_hz = 32000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
.backlight = 1,
},
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{ "dc", 24 },
{ "led", 18 },
{},
},
}
}
}, {
.name = "adafruit13m",
.spi = &(struct spi_board_info) {
.modalias = "fb_ssd1306",
.max_speed_hz = 16000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
},
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{ "dc", 24 },
{},
},
}
}
}, {
.name = "flexfb",
.spi = &(struct spi_board_info) {
.modalias = "flexfb",
.max_speed_hz = 32000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{ "dc", 24 },
{},
},
}
}
}, {
.name = "flexpfb",
.pdev = &(struct platform_device) {
.name = "flexpfb",
.id = 0,
.dev = {
.release = fbtft_device_pdev_release,
.platform_data = &(struct fbtft_platform_data) {
.gpios = (const struct fbtft_gpio []) {
{ "reset", 17 },
{ "dc", 1 },
{ "wr", 0 },
{ "cs", 21 },
{ "db00", 9 },
{ "db01", 11 },
{ "db02", 18 },
{ "db03", 23 },
{ "db04", 24 },
{ "db05", 25 },
{ "db06", 8 },
{ "db07", 7 },
{ "led", 4 },
{},
},
},
}
}
}, {
.name = "freetronicsoled128",
.spi = &(struct spi_board_info) {
.modalias = "fb_ssd1351",
.max_speed_hz = 20000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
.backlight = FBTFT_ONBOARD_BACKLIGHT,
},
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{ "reset", 24 },
{ "dc", 25 },
{},
},
}
}
}, {
.name = "hx8353d",
.spi = &(struct spi_board_info) {
.modalias = "fb_hx8353d",
.max_speed_hz = 16000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
.backlight = 1,
},
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{ "dc", 24 },
{ "led", 23 },
{},
},
}
}
}, {
.name = "hy28a",
.spi = &(struct spi_board_info) {
.modalias = "fb_ili9320",
.max_speed_hz = 32000000,
.mode = SPI_MODE_3,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
.backlight = 1,
},
.startbyte = 0b01110000,
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{ "led", 18 },
{},
},
}
}
}, {
.name = "hy28b",
.spi = &(struct spi_board_info) {
.modalias = "fb_ili9325",
.max_speed_hz = 48000000,
.mode = SPI_MODE_3,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
.backlight = 1,
.init_sequence = hy28b_init_sequence,
},
.startbyte = 0b01110000,
.bgr = true,
.fps= 50,
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{ "led", 18 },
{},
},
.gamma = HY28B_GAMMA,
}
}
}, {
.name = "itdb24",
.pdev = &(struct platform_device) {
.name = "fb_s6d1121",
.id = 0,
.dev = {
.release = fbtft_device_pdev_release,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
.backlight = 1,
},
.bgr = false,
.gpios = (const struct fbtft_gpio []) {
/* Wiring for LCD adapter kit */
{ "reset", 7 },
{ "dc", 0 }, /* rev 2: 2 */
{ "wr", 1 }, /* rev 2: 3 */
{ "cs", 8 },
{ "db00", 17 },
{ "db01", 18 },
{ "db02", 21 }, /* rev 2: 27 */
{ "db03", 22 },
{ "db04", 23 },
{ "db05", 24 },
{ "db06", 25 },
{ "db07", 4 },
{}
},
},
}
}
}, {
.name = "itdb28",
.pdev = &(struct platform_device) {
.name = "fb_ili9325",
.id = 0,
.dev = {
.release = fbtft_device_pdev_release,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
.backlight = 1,
},
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{},
},
},
}
}
}, {
.name = "itdb28_spi",
.spi = &(struct spi_board_info) {
.modalias = "fb_ili9325",
.max_speed_hz = 32000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
.backlight = 1,
},
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{ "dc", 24 },
{},
},
}
}
}, {
.name = "mi0283qt-2",
.spi = &(struct spi_board_info) {
.modalias = "fb_hx8347d",
.max_speed_hz = 32000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
.backlight = 1,
},
.startbyte = 0b01110000,
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{ "dc", 24 },
{ "led", 18 },
{},
},
}
}
}, {
.name = "mi0283qt-9a",
.spi = &(struct spi_board_info) {
.modalias = "fb_ili9341",
.max_speed_hz = 32000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 9,
.backlight = 1,
},
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{ "led", 18 },
{},
},
}
}
}, {
.name = "mi0283qt-v2",
.spi = &(struct spi_board_info) {
.modalias = "fb_watterott",
.max_speed_hz = 4000000,
.mode = SPI_MODE_3,
.platform_data = &(struct fbtft_platform_data) {
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{},
},
}
}
}, {
.name = "nokia3310",
.spi = &(struct spi_board_info) {
.modalias = "fb_pcd8544",
.max_speed_hz = 400000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
},
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{ "dc", 24 },
{ "led", 23 },
{},
},
}
}
}, {
.name = "pitft",
.spi = &(struct spi_board_info) {
.modalias = "fb_ili9340",
.max_speed_hz = 32000000,
.mode = SPI_MODE_0,
.chip_select = 0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
.backlight = 1,
.init_sequence = pitft_init_sequence,
},
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{ "dc", 25 },
{},
},
}
}
}, {
.name = "pioled",
.spi = &(struct spi_board_info) {
.modalias = "fb_ssd1351",
.max_speed_hz = 20000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
},
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{ "reset", 24 },
{ "dc", 25 },
{},
},
.gamma = "0 2 2 2 2 2 2 2 " \
"2 2 2 2 2 2 2 2 " \
"2 2 2 2 2 2 2 2 " \
"2 2 2 2 2 2 2 3 " \
"3 3 3 3 3 3 3 3 " \
"3 3 3 3 3 3 3 3 " \
"3 3 3 4 4 4 4 4 " \
"4 4 4 4 4 4 4"
}
}
}, {
.name = "rpi-display",
.spi = &(struct spi_board_info) {
.modalias = "fb_ili9341",
.max_speed_hz = 32000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
.backlight = 1,
},
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{ "reset", 23 },
{ "dc", 24 },
{ "led", 18 },
{},
},
}
}
}, {
.name = "s6d02a1",
.spi = &(struct spi_board_info) {
.modalias = "fb_s6d02a1",
.max_speed_hz = 32000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
.backlight = 1,
},
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{ "dc", 24 },
{ "led", 23 },
{},
},
}
}
}, {
.name = "sainsmart18",
.spi = &(struct spi_board_info) {
.modalias = "fb_st7735r",
.max_speed_hz = 32000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
},
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{ "dc", 24 },
{},
},
}
}
}, {
.name = "sainsmart32",
.pdev = &(struct platform_device) {
.name = "fb_ssd1289",
.id = 0,
.dev = {
.release = fbtft_device_pdev_release,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 16,
.txbuflen = -2, /* disable buffer */
.backlight = 1,
.fbtftops.write = write_gpio16_wr_slow,
},
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{},
},
},
},
}
}, {
.name = "sainsmart32_fast",
.pdev = &(struct platform_device) {
.name = "fb_ssd1289",
.id = 0,
.dev = {
.release = fbtft_device_pdev_release,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 16,
.txbuflen = -2, /* disable buffer */
.backlight = 1,
},
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{},
},
},
},
}
}, {
.name = "sainsmart32_latched",
.pdev = &(struct platform_device) {
.name = "fb_ssd1289",
.id = 0,
.dev = {
.release = fbtft_device_pdev_release,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 16,
.txbuflen = -2, /* disable buffer */
.backlight = 1,
.fbtftops.write = \
fbtft_write_gpio16_wr_latched,
},
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{},
},
},
},
}
}, {
.name = "sainsmart32_spi",
.spi = &(struct spi_board_info) {
.modalias = "fb_ssd1289",
.max_speed_hz = 16000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
.backlight = 1,
},
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{ "dc", 24 },
{},
},
}
}
}, {
.name = "spidev",
.spi = &(struct spi_board_info) {
.modalias = "spidev",
.max_speed_hz = 500000,
.bus_num = 0,
.chip_select = 0,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.gpios = (const struct fbtft_gpio []) {
{},
},
}
}
}, {
.name = "ssd1331",
.spi = &(struct spi_board_info) {
.modalias = "fb_ssd1331",
.max_speed_hz = 20000000,
.mode = SPI_MODE_3,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
},
.gpios = (const struct fbtft_gpio []) {
{ "reset", 24 },
{ "dc", 25 },
{},
},
}
}
}, {
.name = "tinylcd35",
.spi = &(struct spi_board_info) {
.modalias = "fb_tinylcd",
.max_speed_hz = 32000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
.backlight = 1,
},
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{ "dc", 24 },
{ "led", 18 },
{},
},
}
}
}, {
.name = "tm022hdh26",
.spi = &(struct spi_board_info) {
.modalias = "fb_ili9341",
.max_speed_hz = 32000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
.backlight = 1,
},
.bgr = true,
.gpios = (const struct fbtft_gpio []) {
{ "reset", 25 },
{ "dc", 24 },
{ "led", 18 },
{},
},
}
}
}, {
.name = "upd161704",
.spi = &(struct spi_board_info) {
.modalias = "fb_upd161704",
.max_speed_hz = 32000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
},
.gpios = (const struct fbtft_gpio []) {
{ "reset", 24 },
{ "dc", 25 },
{},
},
}
}
}, {
.name = "waveshare22",
.spi = &(struct spi_board_info) {
.modalias = "fb_bd663474",
.max_speed_hz = 32000000,
.mode = SPI_MODE_3,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
},
.gpios = (const struct fbtft_gpio []) {
{ "reset", 24 },
{ "dc", 25 },
{},
},
}
}
}, {
/* This should be the last item.
Used with the custom argument */
.name = "",
.spi = &(struct spi_board_info) {
.modalias = "",
.max_speed_hz = 0,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.gpios = (const struct fbtft_gpio []) {
{},
},
}
},
.pdev = &(struct platform_device) {
.name = "",
.id = 0,
.dev = {
.release = fbtft_device_pdev_release,
.platform_data = &(struct fbtft_platform_data) {
.gpios = (const struct fbtft_gpio []) {
{},
},
},
},
},
}
};
static int write_gpio16_wr_slow(struct fbtft_par *par, void *buf, size_t len)
{
u16 data;
int i;
#ifndef DO_NOT_OPTIMIZE_FBTFT_WRITE_GPIO
static u16 prev_data;
#endif
fbtft_par_dbg_hex(DEBUG_WRITE, par, par->info->device, u8, buf, len,
"%s(len=%d): ", __func__, len);
while (len) {
data = *(u16 *) buf;
/* Start writing by pulling down /WR */
gpio_set_value(par->gpio.wr, 0);
/* Set data */
#ifndef DO_NOT_OPTIMIZE_FBTFT_WRITE_GPIO
if (data == prev_data) {
gpio_set_value(par->gpio.wr, 0); /* used as delay */
} else {
for (i = 0; i < 16; i++) {
if ((data & 1) != (prev_data & 1))
gpio_set_value(par->gpio.db[i],
(data & 1));
data >>= 1;
prev_data >>= 1;
}
}
#else
for (i = 0; i < 16; i++) {
gpio_set_value(par->gpio.db[i], (data & 1));
data >>= 1;
}
#endif
/* Pullup /WR */
gpio_set_value(par->gpio.wr, 1);
#ifndef DO_NOT_OPTIMIZE_FBTFT_WRITE_GPIO
prev_data = *(u16 *) buf;
#endif
buf += 2;
len -= 2;
}
return 0;
}
static void adafruit18_green_tab_set_addr_win(struct fbtft_par *par,
int xs, int ys, int xe, int ye)
{
fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par,
"%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye);
write_reg(par, 0x2A, 0, xs + 2, 0, xe + 2);
write_reg(par, 0x2B, 0, ys + 1, 0, ye + 1);
write_reg(par, 0x2C);
}
/* used if gpios parameter is present */
static struct fbtft_gpio fbtft_device_param_gpios[MAX_GPIOS+1] = { };
static void fbtft_device_pdev_release(struct device *dev)
{
/* Needed to silence this message:
Device 'xxx' does not have a release() function, it is broken and must be fixed
*/
}
static int spi_device_found(struct device *dev, void *data)
{
struct spi_device *spi = container_of(dev, struct spi_device, dev);
pr_info(DRVNAME": %s %s %dkHz %d bits mode=0x%02X\n",
spi->modalias, dev_name(dev), spi->max_speed_hz/1000,
spi->bits_per_word, spi->mode);
return 0;
}
static void pr_spi_devices(void)
{
pr_info(DRVNAME": SPI devices registered:\n");
bus_for_each_dev(&spi_bus_type, NULL, NULL, spi_device_found);
}
static int p_device_found(struct device *dev, void *data)
{
struct platform_device
*pdev = container_of(dev, struct platform_device, dev);
if (strstr(pdev->name, "fb"))
pr_info(DRVNAME": %s id=%d pdata? %s\n",
pdev->name, pdev->id,
pdev->dev.platform_data ? "yes" : "no");
return 0;
}
static void pr_p_devices(void)
{
pr_info(DRVNAME": 'fb' Platform devices registered:\n");
bus_for_each_dev(&platform_bus_type, NULL, NULL, p_device_found);
}
#ifdef MODULE
static void fbtft_device_spi_delete(struct spi_master *master, unsigned cs)
{
struct device *dev;
char str[32];
snprintf(str, sizeof(str), "%s.%u", dev_name(&master->dev), cs);
dev = bus_find_device_by_name(&spi_bus_type, NULL, str);
if (dev) {
if (verbose)
pr_info(DRVNAME": Deleting %s\n", str);
device_del(dev);
}
}
static int fbtft_device_spi_device_register(struct spi_board_info *spi)
{
struct spi_master *master;
master = spi_busnum_to_master(spi->bus_num);
if (!master) {
pr_err(DRVNAME ": spi_busnum_to_master(%d) returned NULL\n",
spi->bus_num);
return -EINVAL;
}
/* make sure it's available */
fbtft_device_spi_delete(master, spi->chip_select);
spi_device = spi_new_device(master, spi);
put_device(&master->dev);
if (!spi_device) {
pr_err(DRVNAME ": spi_new_device() returned NULL\n");
return -EPERM;
}
return 0;
}
#else
static int fbtft_device_spi_device_register(struct spi_board_info *spi)
{
return spi_register_board_info(spi, 1);
}
#endif
static int __init fbtft_device_init(void)
{