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![Peter Suti](/assets/img/avatar_default.png)
The fbtft_framebuffer_alloc() calls fb_deferred_io_init() before
initializing info->fix.smem_len. It is set to zero by the
framebuffer_alloc() function. It will trigger a WARN_ON() at the
start of fb_deferred_io_init() and the function will not do anything.
Fixes: 856082f021
("fbdev: defio: fix the pagelist corruption")
Signed-off-by: Peter Suti <peter.suti@streamunlimited.com>
Link: https://lore.kernel.org/r/20220727073550.1491126-1-peter.suti@streamunlimited.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1327 lines
34 KiB
C
1327 lines
34 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2013 Noralf Tronnes
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*
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* This driver is inspired by:
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* st7735fb.c, Copyright (C) 2011, Matt Porter
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* broadsheetfb.c, Copyright (C) 2008, Jaya Kumar
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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/errno.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/fb.h>
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#include <linux/gpio/consumer.h>
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#include <linux/spi/spi.h>
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#include <linux/delay.h>
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#include <linux/uaccess.h>
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#include <linux/backlight.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/spinlock.h>
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#include <video/mipi_display.h>
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#include "fbtft.h"
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#include "internal.h"
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static unsigned long debug;
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module_param(debug, ulong, 0000);
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MODULE_PARM_DESC(debug, "override device debug level");
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int fbtft_write_buf_dc(struct fbtft_par *par, void *buf, size_t len, int dc)
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{
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int ret;
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gpiod_set_value(par->gpio.dc, dc);
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ret = par->fbtftops.write(par, buf, len);
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if (ret < 0)
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dev_err(par->info->device,
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"write() failed and returned %d\n", ret);
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return ret;
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}
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EXPORT_SYMBOL(fbtft_write_buf_dc);
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void fbtft_dbg_hex(const struct device *dev, int groupsize,
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const void *buf, size_t len, const char *fmt, ...)
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{
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va_list args;
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static char textbuf[512];
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char *text = textbuf;
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size_t text_len;
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va_start(args, fmt);
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text_len = vscnprintf(text, sizeof(textbuf), fmt, args);
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va_end(args);
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hex_dump_to_buffer(buf, len, 32, groupsize, text + text_len,
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512 - text_len, false);
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if (len > 32)
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dev_info(dev, "%s ...\n", text);
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else
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dev_info(dev, "%s\n", text);
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}
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EXPORT_SYMBOL(fbtft_dbg_hex);
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static int fbtft_request_one_gpio(struct fbtft_par *par,
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const char *name, int index,
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struct gpio_desc **gpiop)
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{
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struct device *dev = par->info->device;
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*gpiop = devm_gpiod_get_index_optional(dev, name, index,
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GPIOD_OUT_LOW);
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if (IS_ERR(*gpiop))
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return dev_err_probe(dev, PTR_ERR(*gpiop), "Failed to request %s GPIO\n", name);
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fbtft_par_dbg(DEBUG_REQUEST_GPIOS, par, "%s: '%s' GPIO\n",
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__func__, name);
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return 0;
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}
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static int fbtft_request_gpios(struct fbtft_par *par)
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{
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int i;
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int ret;
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ret = fbtft_request_one_gpio(par, "reset", 0, &par->gpio.reset);
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if (ret)
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return ret;
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ret = fbtft_request_one_gpio(par, "dc", 0, &par->gpio.dc);
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if (ret)
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return ret;
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ret = fbtft_request_one_gpio(par, "rd", 0, &par->gpio.rd);
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if (ret)
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return ret;
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ret = fbtft_request_one_gpio(par, "wr", 0, &par->gpio.wr);
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if (ret)
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return ret;
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ret = fbtft_request_one_gpio(par, "cs", 0, &par->gpio.cs);
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if (ret)
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return ret;
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ret = fbtft_request_one_gpio(par, "latch", 0, &par->gpio.latch);
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if (ret)
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return ret;
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for (i = 0; i < 16; i++) {
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ret = fbtft_request_one_gpio(par, "db", i,
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&par->gpio.db[i]);
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if (ret)
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return ret;
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ret = fbtft_request_one_gpio(par, "led", i,
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&par->gpio.led[i]);
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if (ret)
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return ret;
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ret = fbtft_request_one_gpio(par, "aux", i,
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&par->gpio.aux[i]);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int fbtft_backlight_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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bool polarity = par->polarity;
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fbtft_par_dbg(DEBUG_BACKLIGHT, par,
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"%s: polarity=%d, power=%d, fb_blank=%d\n",
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__func__, polarity, bd->props.power, bd->props.fb_blank);
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if (!backlight_is_blank(bd))
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gpiod_set_value(par->gpio.led[0], polarity);
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else
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gpiod_set_value(par->gpio.led[0], !polarity);
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return 0;
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}
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static int fbtft_backlight_get_brightness(struct backlight_device *bd)
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{
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return bd->props.brightness;
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}
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void fbtft_unregister_backlight(struct fbtft_par *par)
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{
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if (par->info->bl_dev) {
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par->info->bl_dev->props.power = FB_BLANK_POWERDOWN;
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backlight_update_status(par->info->bl_dev);
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backlight_device_unregister(par->info->bl_dev);
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par->info->bl_dev = NULL;
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}
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}
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EXPORT_SYMBOL(fbtft_unregister_backlight);
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static const struct backlight_ops fbtft_bl_ops = {
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.get_brightness = fbtft_backlight_get_brightness,
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.update_status = fbtft_backlight_update_status,
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};
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void fbtft_register_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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if (!par->gpio.led[0]) {
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fbtft_par_dbg(DEBUG_BACKLIGHT, par,
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"%s(): led pin not set, exiting.\n", __func__);
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return;
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}
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bl_props.type = BACKLIGHT_RAW;
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/* Assume backlight is off, get polarity from current state of pin */
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bl_props.power = FB_BLANK_POWERDOWN;
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if (!gpiod_get_value(par->gpio.led[0]))
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par->polarity = true;
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bd = backlight_device_register(dev_driver_string(par->info->device),
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par->info->device, par,
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&fbtft_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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EXPORT_SYMBOL(fbtft_register_backlight);
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static void fbtft_set_addr_win(struct fbtft_par *par, int xs, int ys, int xe,
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int ye)
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{
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write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
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(xs >> 8) & 0xFF, xs & 0xFF, (xe >> 8) & 0xFF, xe & 0xFF);
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write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
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(ys >> 8) & 0xFF, ys & 0xFF, (ye >> 8) & 0xFF, ye & 0xFF);
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write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
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}
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static void fbtft_reset(struct fbtft_par *par)
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{
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if (!par->gpio.reset)
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return;
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fbtft_par_dbg(DEBUG_RESET, par, "%s()\n", __func__);
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gpiod_set_value_cansleep(par->gpio.reset, 1);
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usleep_range(20, 40);
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gpiod_set_value_cansleep(par->gpio.reset, 0);
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msleep(120);
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gpiod_set_value_cansleep(par->gpio.cs, 1); /* Activate chip */
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}
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static void fbtft_update_display(struct fbtft_par *par, unsigned int start_line,
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unsigned int end_line)
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{
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size_t offset, len;
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ktime_t ts_start, ts_end;
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long fps, throughput;
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bool timeit = false;
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int ret = 0;
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if (unlikely(par->debug & (DEBUG_TIME_FIRST_UPDATE |
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DEBUG_TIME_EACH_UPDATE))) {
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if ((par->debug & DEBUG_TIME_EACH_UPDATE) ||
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((par->debug & DEBUG_TIME_FIRST_UPDATE) &&
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!par->first_update_done)) {
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ts_start = ktime_get();
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timeit = true;
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}
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}
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/* Sanity checks */
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if (start_line > end_line) {
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dev_warn(par->info->device,
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"%s: start_line=%u is larger than end_line=%u. Shouldn't happen, will do full display update\n",
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__func__, start_line, end_line);
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start_line = 0;
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end_line = par->info->var.yres - 1;
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}
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if (start_line > par->info->var.yres - 1 ||
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end_line > par->info->var.yres - 1) {
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dev_warn(par->info->device,
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"%s: start_line=%u or end_line=%u is larger than max=%d. Shouldn't happen, will do full display update\n",
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__func__, start_line,
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end_line, par->info->var.yres - 1);
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start_line = 0;
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end_line = par->info->var.yres - 1;
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}
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fbtft_par_dbg(DEBUG_UPDATE_DISPLAY, par, "%s(start_line=%u, end_line=%u)\n",
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__func__, start_line, end_line);
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if (par->fbtftops.set_addr_win)
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par->fbtftops.set_addr_win(par, 0, start_line,
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par->info->var.xres - 1, end_line);
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offset = start_line * par->info->fix.line_length;
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len = (end_line - start_line + 1) * par->info->fix.line_length;
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ret = par->fbtftops.write_vmem(par, offset, len);
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if (ret < 0)
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dev_err(par->info->device,
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"%s: write_vmem failed to update display buffer\n",
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__func__);
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if (unlikely(timeit)) {
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ts_end = ktime_get();
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if (!ktime_to_ns(par->update_time))
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par->update_time = ts_start;
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fps = ktime_us_delta(ts_start, par->update_time);
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par->update_time = ts_start;
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fps = fps ? 1000000 / fps : 0;
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throughput = ktime_us_delta(ts_end, ts_start);
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throughput = throughput ? (len * 1000) / throughput : 0;
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throughput = throughput * 1000 / 1024;
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dev_info(par->info->device,
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"Display update: %ld kB/s, fps=%ld\n",
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throughput, fps);
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par->first_update_done = true;
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}
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}
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static void fbtft_mkdirty(struct fb_info *info, int y, int height)
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{
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struct fbtft_par *par = info->par;
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struct fb_deferred_io *fbdefio = info->fbdefio;
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/* special case, needed ? */
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if (y == -1) {
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y = 0;
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height = info->var.yres;
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}
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/* Mark display lines/area as dirty */
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spin_lock(&par->dirty_lock);
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if (y < par->dirty_lines_start)
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par->dirty_lines_start = y;
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if (y + height - 1 > par->dirty_lines_end)
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par->dirty_lines_end = y + height - 1;
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spin_unlock(&par->dirty_lock);
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/* Schedule deferred_io to update display (no-op if already on queue)*/
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schedule_delayed_work(&info->deferred_work, fbdefio->delay);
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}
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static void fbtft_deferred_io(struct fb_info *info, struct list_head *pagereflist)
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{
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struct fbtft_par *par = info->par;
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unsigned int dirty_lines_start, dirty_lines_end;
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struct fb_deferred_io_pageref *pageref;
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unsigned int y_low = 0, y_high = 0;
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int count = 0;
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spin_lock(&par->dirty_lock);
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dirty_lines_start = par->dirty_lines_start;
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dirty_lines_end = par->dirty_lines_end;
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/* set display line markers as clean */
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par->dirty_lines_start = par->info->var.yres - 1;
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par->dirty_lines_end = 0;
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spin_unlock(&par->dirty_lock);
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/* Mark display lines as dirty */
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list_for_each_entry(pageref, pagereflist, list) {
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count++;
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y_low = pageref->offset / info->fix.line_length;
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y_high = (pageref->offset + PAGE_SIZE - 1) / info->fix.line_length;
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dev_dbg(info->device,
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"page->index=%lu y_low=%d y_high=%d\n",
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pageref->page->index, y_low, y_high);
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if (y_high > info->var.yres - 1)
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y_high = info->var.yres - 1;
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if (y_low < dirty_lines_start)
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dirty_lines_start = y_low;
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if (y_high > dirty_lines_end)
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dirty_lines_end = y_high;
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}
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par->fbtftops.update_display(info->par,
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dirty_lines_start, dirty_lines_end);
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}
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static void fbtft_fb_fillrect(struct fb_info *info,
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const struct fb_fillrect *rect)
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{
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struct fbtft_par *par = info->par;
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dev_dbg(info->dev,
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"%s: dx=%d, dy=%d, width=%d, height=%d\n",
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__func__, rect->dx, rect->dy, rect->width, rect->height);
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sys_fillrect(info, rect);
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par->fbtftops.mkdirty(info, rect->dy, rect->height);
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}
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static void fbtft_fb_copyarea(struct fb_info *info,
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const struct fb_copyarea *area)
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{
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struct fbtft_par *par = info->par;
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dev_dbg(info->dev,
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"%s: dx=%d, dy=%d, width=%d, height=%d\n",
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__func__, area->dx, area->dy, area->width, area->height);
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sys_copyarea(info, area);
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par->fbtftops.mkdirty(info, area->dy, area->height);
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}
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static void fbtft_fb_imageblit(struct fb_info *info,
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const struct fb_image *image)
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{
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struct fbtft_par *par = info->par;
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dev_dbg(info->dev,
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"%s: dx=%d, dy=%d, width=%d, height=%d\n",
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__func__, image->dx, image->dy, image->width, image->height);
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sys_imageblit(info, image);
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par->fbtftops.mkdirty(info, image->dy, image->height);
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}
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static ssize_t fbtft_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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struct fbtft_par *par = info->par;
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ssize_t res;
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dev_dbg(info->dev,
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"%s: count=%zd, ppos=%llu\n", __func__, count, *ppos);
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res = fb_sys_write(info, buf, count, ppos);
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/* TODO: only mark changed area update all for now */
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par->fbtftops.mkdirty(info, -1, 0);
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return res;
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}
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/* from pxafb.c */
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static unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf)
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{
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chan &= 0xffff;
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chan >>= 16 - bf->length;
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return chan << bf->offset;
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}
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static int fbtft_fb_setcolreg(unsigned int regno, unsigned int red,
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unsigned int green, unsigned int blue,
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unsigned int transp, struct fb_info *info)
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{
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unsigned int val;
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int ret = 1;
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dev_dbg(info->dev,
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"%s(regno=%u, red=0x%X, green=0x%X, blue=0x%X, trans=0x%X)\n",
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__func__, regno, red, green, blue, transp);
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switch (info->fix.visual) {
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case FB_VISUAL_TRUECOLOR:
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if (regno < 16) {
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u32 *pal = info->pseudo_palette;
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val = chan_to_field(red, &info->var.red);
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val |= chan_to_field(green, &info->var.green);
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val |= chan_to_field(blue, &info->var.blue);
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pal[regno] = val;
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ret = 0;
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}
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break;
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}
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return ret;
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}
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static int fbtft_fb_blank(int blank, struct fb_info *info)
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{
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struct fbtft_par *par = info->par;
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int ret = -EINVAL;
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dev_dbg(info->dev, "%s(blank=%d)\n",
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__func__, blank);
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if (!par->fbtftops.blank)
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return ret;
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switch (blank) {
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case FB_BLANK_POWERDOWN:
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case FB_BLANK_VSYNC_SUSPEND:
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case FB_BLANK_HSYNC_SUSPEND:
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case FB_BLANK_NORMAL:
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ret = par->fbtftops.blank(par, true);
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break;
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case FB_BLANK_UNBLANK:
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ret = par->fbtftops.blank(par, false);
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break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void fbtft_merge_fbtftops(struct fbtft_ops *dst, struct fbtft_ops *src)
|
|
{
|
|
if (src->write)
|
|
dst->write = src->write;
|
|
if (src->read)
|
|
dst->read = src->read;
|
|
if (src->write_vmem)
|
|
dst->write_vmem = src->write_vmem;
|
|
if (src->write_register)
|
|
dst->write_register = src->write_register;
|
|
if (src->set_addr_win)
|
|
dst->set_addr_win = src->set_addr_win;
|
|
if (src->reset)
|
|
dst->reset = src->reset;
|
|
if (src->mkdirty)
|
|
dst->mkdirty = src->mkdirty;
|
|
if (src->update_display)
|
|
dst->update_display = src->update_display;
|
|
if (src->init_display)
|
|
dst->init_display = src->init_display;
|
|
if (src->blank)
|
|
dst->blank = src->blank;
|
|
if (src->request_gpios_match)
|
|
dst->request_gpios_match = src->request_gpios_match;
|
|
if (src->request_gpios)
|
|
dst->request_gpios = src->request_gpios;
|
|
if (src->verify_gpios)
|
|
dst->verify_gpios = src->verify_gpios;
|
|
if (src->register_backlight)
|
|
dst->register_backlight = src->register_backlight;
|
|
if (src->unregister_backlight)
|
|
dst->unregister_backlight = src->unregister_backlight;
|
|
if (src->set_var)
|
|
dst->set_var = src->set_var;
|
|
if (src->set_gamma)
|
|
dst->set_gamma = src->set_gamma;
|
|
}
|
|
|
|
/**
|
|
* fbtft_framebuffer_alloc - creates a new frame buffer info structure
|
|
*
|
|
* @display: pointer to structure describing the display
|
|
* @dev: pointer to the device for this fb, this can be NULL
|
|
* @pdata: platform data for the display in use
|
|
*
|
|
* Creates a new frame buffer info structure.
|
|
*
|
|
* Also creates and populates the following structures:
|
|
* info->fbops
|
|
* info->fbdefio
|
|
* info->pseudo_palette
|
|
* par->fbtftops
|
|
* par->txbuf
|
|
*
|
|
* Returns the new structure, or NULL if an error occurred.
|
|
*
|
|
*/
|
|
struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
|
|
struct device *dev,
|
|
struct fbtft_platform_data *pdata)
|
|
{
|
|
struct fb_info *info;
|
|
struct fbtft_par *par;
|
|
struct fb_ops *fbops = NULL;
|
|
struct fb_deferred_io *fbdefio = NULL;
|
|
u8 *vmem = NULL;
|
|
void *txbuf = NULL;
|
|
void *buf = NULL;
|
|
unsigned int width;
|
|
unsigned int height;
|
|
int txbuflen = display->txbuflen;
|
|
unsigned int bpp = display->bpp;
|
|
unsigned int fps = display->fps;
|
|
int vmem_size;
|
|
const s16 *init_sequence = display->init_sequence;
|
|
char *gamma = display->gamma;
|
|
u32 *gamma_curves = NULL;
|
|
|
|
/* sanity check */
|
|
if (display->gamma_num * display->gamma_len >
|
|
FBTFT_GAMMA_MAX_VALUES_TOTAL) {
|
|
dev_err(dev, "FBTFT_GAMMA_MAX_VALUES_TOTAL=%d is exceeded\n",
|
|
FBTFT_GAMMA_MAX_VALUES_TOTAL);
|
|
return NULL;
|
|
}
|
|
|
|
/* defaults */
|
|
if (!fps)
|
|
fps = 20;
|
|
if (!bpp)
|
|
bpp = 16;
|
|
|
|
if (!pdata) {
|
|
dev_err(dev, "platform data is missing\n");
|
|
return NULL;
|
|
}
|
|
|
|
/* override driver values? */
|
|
if (pdata->fps)
|
|
fps = pdata->fps;
|
|
if (pdata->txbuflen)
|
|
txbuflen = pdata->txbuflen;
|
|
if (pdata->display.init_sequence)
|
|
init_sequence = pdata->display.init_sequence;
|
|
if (pdata->gamma)
|
|
gamma = pdata->gamma;
|
|
if (pdata->display.debug)
|
|
display->debug = pdata->display.debug;
|
|
if (pdata->display.backlight)
|
|
display->backlight = pdata->display.backlight;
|
|
if (pdata->display.width)
|
|
display->width = pdata->display.width;
|
|
if (pdata->display.height)
|
|
display->height = pdata->display.height;
|
|
if (pdata->display.buswidth)
|
|
display->buswidth = pdata->display.buswidth;
|
|
if (pdata->display.regwidth)
|
|
display->regwidth = pdata->display.regwidth;
|
|
|
|
display->debug |= debug;
|
|
fbtft_expand_debug_value(&display->debug);
|
|
|
|
switch (pdata->rotate) {
|
|
case 90:
|
|
case 270:
|
|
width = display->height;
|
|
height = display->width;
|
|
break;
|
|
default:
|
|
width = display->width;
|
|
height = display->height;
|
|
}
|
|
|
|
vmem_size = display->width * display->height * bpp / 8;
|
|
vmem = vzalloc(vmem_size);
|
|
if (!vmem)
|
|
goto alloc_fail;
|
|
|
|
fbops = devm_kzalloc(dev, sizeof(struct fb_ops), GFP_KERNEL);
|
|
if (!fbops)
|
|
goto alloc_fail;
|
|
|
|
fbdefio = devm_kzalloc(dev, sizeof(struct fb_deferred_io), GFP_KERNEL);
|
|
if (!fbdefio)
|
|
goto alloc_fail;
|
|
|
|
buf = devm_kzalloc(dev, 128, GFP_KERNEL);
|
|
if (!buf)
|
|
goto alloc_fail;
|
|
|
|
if (display->gamma_num && display->gamma_len) {
|
|
gamma_curves = devm_kcalloc(dev,
|
|
display->gamma_num *
|
|
display->gamma_len,
|
|
sizeof(gamma_curves[0]),
|
|
GFP_KERNEL);
|
|
if (!gamma_curves)
|
|
goto alloc_fail;
|
|
}
|
|
|
|
info = framebuffer_alloc(sizeof(struct fbtft_par), dev);
|
|
if (!info)
|
|
goto alloc_fail;
|
|
|
|
info->screen_buffer = vmem;
|
|
info->fbops = fbops;
|
|
info->fbdefio = fbdefio;
|
|
|
|
fbops->owner = dev->driver->owner;
|
|
fbops->fb_read = fb_sys_read;
|
|
fbops->fb_write = fbtft_fb_write;
|
|
fbops->fb_fillrect = fbtft_fb_fillrect;
|
|
fbops->fb_copyarea = fbtft_fb_copyarea;
|
|
fbops->fb_imageblit = fbtft_fb_imageblit;
|
|
fbops->fb_setcolreg = fbtft_fb_setcolreg;
|
|
fbops->fb_blank = fbtft_fb_blank;
|
|
fbops->fb_mmap = fb_deferred_io_mmap;
|
|
|
|
fbdefio->delay = HZ / fps;
|
|
fbdefio->sort_pagereflist = true;
|
|
fbdefio->deferred_io = fbtft_deferred_io;
|
|
|
|
snprintf(info->fix.id, sizeof(info->fix.id), "%s", dev->driver->name);
|
|
info->fix.type = FB_TYPE_PACKED_PIXELS;
|
|
info->fix.visual = FB_VISUAL_TRUECOLOR;
|
|
info->fix.xpanstep = 0;
|
|
info->fix.ypanstep = 0;
|
|
info->fix.ywrapstep = 0;
|
|
info->fix.line_length = width * bpp / 8;
|
|
info->fix.accel = FB_ACCEL_NONE;
|
|
info->fix.smem_len = vmem_size;
|
|
fb_deferred_io_init(info);
|
|
|
|
info->var.rotate = pdata->rotate;
|
|
info->var.xres = width;
|
|
info->var.yres = height;
|
|
info->var.xres_virtual = info->var.xres;
|
|
info->var.yres_virtual = info->var.yres;
|
|
info->var.bits_per_pixel = bpp;
|
|
info->var.nonstd = 1;
|
|
|
|
/* RGB565 */
|
|
info->var.red.offset = 11;
|
|
info->var.red.length = 5;
|
|
info->var.green.offset = 5;
|
|
info->var.green.length = 6;
|
|
info->var.blue.offset = 0;
|
|
info->var.blue.length = 5;
|
|
info->var.transp.offset = 0;
|
|
info->var.transp.length = 0;
|
|
|
|
info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB;
|
|
|
|
par = info->par;
|
|
par->info = info;
|
|
par->pdata = pdata;
|
|
par->debug = display->debug;
|
|
par->buf = buf;
|
|
spin_lock_init(&par->dirty_lock);
|
|
par->bgr = pdata->bgr;
|
|
par->startbyte = pdata->startbyte;
|
|
par->init_sequence = init_sequence;
|
|
par->gamma.curves = gamma_curves;
|
|
par->gamma.num_curves = display->gamma_num;
|
|
par->gamma.num_values = display->gamma_len;
|
|
mutex_init(&par->gamma.lock);
|
|
info->pseudo_palette = par->pseudo_palette;
|
|
|
|
if (par->gamma.curves && gamma) {
|
|
if (fbtft_gamma_parse_str(par, par->gamma.curves, gamma,
|
|
strlen(gamma)))
|
|
goto release_framebuf;
|
|
}
|
|
|
|
/* Transmit buffer */
|
|
if (txbuflen == -1)
|
|
txbuflen = vmem_size + 2; /* add in case startbyte is used */
|
|
if (txbuflen >= vmem_size + 2)
|
|
txbuflen = 0;
|
|
|
|
#ifdef __LITTLE_ENDIAN
|
|
if ((!txbuflen) && (bpp > 8))
|
|
txbuflen = PAGE_SIZE; /* need buffer for byteswapping */
|
|
#endif
|
|
|
|
if (txbuflen > 0) {
|
|
txbuf = devm_kzalloc(par->info->device, txbuflen, GFP_KERNEL);
|
|
if (!txbuf)
|
|
goto release_framebuf;
|
|
par->txbuf.buf = txbuf;
|
|
par->txbuf.len = txbuflen;
|
|
}
|
|
|
|
/* default fbtft operations */
|
|
par->fbtftops.write = fbtft_write_spi;
|
|
par->fbtftops.read = fbtft_read_spi;
|
|
par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
|
|
par->fbtftops.write_register = fbtft_write_reg8_bus8;
|
|
par->fbtftops.set_addr_win = fbtft_set_addr_win;
|
|
par->fbtftops.reset = fbtft_reset;
|
|
par->fbtftops.mkdirty = fbtft_mkdirty;
|
|
par->fbtftops.update_display = fbtft_update_display;
|
|
if (display->backlight)
|
|
par->fbtftops.register_backlight = fbtft_register_backlight;
|
|
|
|
/* use driver provided functions */
|
|
fbtft_merge_fbtftops(&par->fbtftops, &display->fbtftops);
|
|
|
|
return info;
|
|
|
|
release_framebuf:
|
|
framebuffer_release(info);
|
|
|
|
alloc_fail:
|
|
vfree(vmem);
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(fbtft_framebuffer_alloc);
|
|
|
|
/**
|
|
* fbtft_framebuffer_release - frees up all memory used by the framebuffer
|
|
*
|
|
* @info: frame buffer info structure
|
|
*
|
|
*/
|
|
void fbtft_framebuffer_release(struct fb_info *info)
|
|
{
|
|
fb_deferred_io_cleanup(info);
|
|
vfree(info->screen_buffer);
|
|
framebuffer_release(info);
|
|
}
|
|
EXPORT_SYMBOL(fbtft_framebuffer_release);
|
|
|
|
/**
|
|
* fbtft_register_framebuffer - registers a tft frame buffer device
|
|
* @fb_info: frame buffer info structure
|
|
*
|
|
* Sets SPI driverdata if needed
|
|
* Requests needed gpios.
|
|
* Initializes display
|
|
* Updates display.
|
|
* Registers a frame buffer device @fb_info.
|
|
*
|
|
* Returns negative errno on error, or zero for success.
|
|
*
|
|
*/
|
|
int fbtft_register_framebuffer(struct fb_info *fb_info)
|
|
{
|
|
int ret;
|
|
char text1[50] = "";
|
|
char text2[50] = "";
|
|
struct fbtft_par *par = fb_info->par;
|
|
struct spi_device *spi = par->spi;
|
|
|
|
/* sanity checks */
|
|
if (!par->fbtftops.init_display) {
|
|
dev_err(fb_info->device, "missing fbtftops.init_display()\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (spi)
|
|
spi_set_drvdata(spi, fb_info);
|
|
if (par->pdev)
|
|
platform_set_drvdata(par->pdev, fb_info);
|
|
|
|
ret = par->fbtftops.request_gpios(par);
|
|
if (ret < 0)
|
|
goto reg_fail;
|
|
|
|
if (par->fbtftops.verify_gpios) {
|
|
ret = par->fbtftops.verify_gpios(par);
|
|
if (ret < 0)
|
|
goto reg_fail;
|
|
}
|
|
|
|
ret = par->fbtftops.init_display(par);
|
|
if (ret < 0)
|
|
goto reg_fail;
|
|
if (par->fbtftops.set_var) {
|
|
ret = par->fbtftops.set_var(par);
|
|
if (ret < 0)
|
|
goto reg_fail;
|
|
}
|
|
|
|
/* update the entire display */
|
|
par->fbtftops.update_display(par, 0, par->info->var.yres - 1);
|
|
|
|
if (par->fbtftops.set_gamma && par->gamma.curves) {
|
|
ret = par->fbtftops.set_gamma(par, par->gamma.curves);
|
|
if (ret)
|
|
goto reg_fail;
|
|
}
|
|
|
|
if (par->fbtftops.register_backlight)
|
|
par->fbtftops.register_backlight(par);
|
|
|
|
ret = register_framebuffer(fb_info);
|
|
if (ret < 0)
|
|
goto reg_fail;
|
|
|
|
fbtft_sysfs_init(par);
|
|
|
|
if (par->txbuf.buf && par->txbuf.len >= 1024)
|
|
sprintf(text1, ", %zu KiB buffer memory", par->txbuf.len >> 10);
|
|
if (spi)
|
|
sprintf(text2, ", spi%d.%d at %d MHz", spi->master->bus_num,
|
|
spi->chip_select, spi->max_speed_hz / 1000000);
|
|
dev_info(fb_info->dev,
|
|
"%s frame buffer, %dx%d, %d KiB video memory%s, fps=%lu%s\n",
|
|
fb_info->fix.id, fb_info->var.xres, fb_info->var.yres,
|
|
fb_info->fix.smem_len >> 10, text1,
|
|
HZ / fb_info->fbdefio->delay, text2);
|
|
|
|
/* Turn on backlight if available */
|
|
if (fb_info->bl_dev) {
|
|
fb_info->bl_dev->props.power = FB_BLANK_UNBLANK;
|
|
fb_info->bl_dev->ops->update_status(fb_info->bl_dev);
|
|
}
|
|
|
|
return 0;
|
|
|
|
reg_fail:
|
|
if (par->fbtftops.unregister_backlight)
|
|
par->fbtftops.unregister_backlight(par);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(fbtft_register_framebuffer);
|
|
|
|
/**
|
|
* fbtft_unregister_framebuffer - releases a tft frame buffer device
|
|
* @fb_info: frame buffer info structure
|
|
*
|
|
* Frees SPI driverdata if needed
|
|
* Frees gpios.
|
|
* Unregisters frame buffer device.
|
|
*
|
|
*/
|
|
int fbtft_unregister_framebuffer(struct fb_info *fb_info)
|
|
{
|
|
struct fbtft_par *par = fb_info->par;
|
|
|
|
if (par->fbtftops.unregister_backlight)
|
|
par->fbtftops.unregister_backlight(par);
|
|
fbtft_sysfs_exit(par);
|
|
unregister_framebuffer(fb_info);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(fbtft_unregister_framebuffer);
|
|
|
|
/**
|
|
* fbtft_init_display_from_property() - Device Tree init_display() function
|
|
* @par: Driver data
|
|
*
|
|
* Return: 0 if successful, negative if error
|
|
*/
|
|
static int fbtft_init_display_from_property(struct fbtft_par *par)
|
|
{
|
|
struct device *dev = par->info->device;
|
|
int buf[64], count, index, i, j, ret;
|
|
u32 *values;
|
|
u32 val;
|
|
|
|
count = device_property_count_u32(dev, "init");
|
|
if (count < 0)
|
|
return count;
|
|
if (count == 0)
|
|
return -EINVAL;
|
|
|
|
values = kmalloc_array(count + 1, sizeof(*values), GFP_KERNEL);
|
|
if (!values)
|
|
return -ENOMEM;
|
|
|
|
ret = device_property_read_u32_array(dev, "init", values, count);
|
|
if (ret)
|
|
goto out_free;
|
|
|
|
par->fbtftops.reset(par);
|
|
|
|
index = -1;
|
|
val = values[++index];
|
|
|
|
while (index < count) {
|
|
if (val & FBTFT_OF_INIT_CMD) {
|
|
val &= 0xFFFF;
|
|
i = 0;
|
|
while ((index < count) && !(val & 0xFFFF0000)) {
|
|
if (i > 63) {
|
|
dev_err(dev,
|
|
"%s: Maximum register values exceeded\n",
|
|
__func__);
|
|
ret = -EINVAL;
|
|
goto out_free;
|
|
}
|
|
buf[i++] = val;
|
|
val = values[++index];
|
|
}
|
|
/* make debug message */
|
|
fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
|
|
"init: write_register:\n");
|
|
for (j = 0; j < i; j++)
|
|
fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
|
|
"buf[%d] = %02X\n", j, buf[j]);
|
|
|
|
par->fbtftops.write_register(par, i,
|
|
buf[0], buf[1], buf[2], buf[3],
|
|
buf[4], buf[5], buf[6], buf[7],
|
|
buf[8], buf[9], buf[10], buf[11],
|
|
buf[12], buf[13], buf[14], buf[15],
|
|
buf[16], buf[17], buf[18], buf[19],
|
|
buf[20], buf[21], buf[22], buf[23],
|
|
buf[24], buf[25], buf[26], buf[27],
|
|
buf[28], buf[29], buf[30], buf[31],
|
|
buf[32], buf[33], buf[34], buf[35],
|
|
buf[36], buf[37], buf[38], buf[39],
|
|
buf[40], buf[41], buf[42], buf[43],
|
|
buf[44], buf[45], buf[46], buf[47],
|
|
buf[48], buf[49], buf[50], buf[51],
|
|
buf[52], buf[53], buf[54], buf[55],
|
|
buf[56], buf[57], buf[58], buf[59],
|
|
buf[60], buf[61], buf[62], buf[63]);
|
|
} else if (val & FBTFT_OF_INIT_DELAY) {
|
|
fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
|
|
"init: msleep(%u)\n", val & 0xFFFF);
|
|
msleep(val & 0xFFFF);
|
|
val = values[++index];
|
|
} else {
|
|
dev_err(dev, "illegal init value 0x%X\n", val);
|
|
ret = -EINVAL;
|
|
goto out_free;
|
|
}
|
|
}
|
|
|
|
out_free:
|
|
kfree(values);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* fbtft_init_display() - Generic init_display() function
|
|
* @par: Driver data
|
|
*
|
|
* Uses par->init_sequence to do the initialization
|
|
*
|
|
* Return: 0 if successful, negative if error
|
|
*/
|
|
int fbtft_init_display(struct fbtft_par *par)
|
|
{
|
|
int buf[64];
|
|
int i;
|
|
int j;
|
|
|
|
/* sanity check */
|
|
if (!par->init_sequence) {
|
|
dev_err(par->info->device,
|
|
"error: init_sequence is not set\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* make sure stop marker exists */
|
|
for (i = 0; i < FBTFT_MAX_INIT_SEQUENCE; i++) {
|
|
if (par->init_sequence[i] == -3)
|
|
break;
|
|
}
|
|
|
|
if (i == FBTFT_MAX_INIT_SEQUENCE) {
|
|
dev_err(par->info->device,
|
|
"missing stop marker at end of init sequence\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
par->fbtftops.reset(par);
|
|
|
|
i = 0;
|
|
while (i < FBTFT_MAX_INIT_SEQUENCE) {
|
|
if (par->init_sequence[i] == -3) {
|
|
/* done */
|
|
return 0;
|
|
}
|
|
if (par->init_sequence[i] >= 0) {
|
|
dev_err(par->info->device,
|
|
"missing delimiter at position %d\n", i);
|
|
return -EINVAL;
|
|
}
|
|
if (par->init_sequence[i + 1] < 0) {
|
|
dev_err(par->info->device,
|
|
"missing value after delimiter %d at position %d\n",
|
|
par->init_sequence[i], i);
|
|
return -EINVAL;
|
|
}
|
|
switch (par->init_sequence[i]) {
|
|
case -1:
|
|
i++;
|
|
|
|
/* make debug message */
|
|
for (j = 0; par->init_sequence[i + 1 + j] >= 0; j++)
|
|
;
|
|
|
|
fbtft_par_dbg_hex(DEBUG_INIT_DISPLAY, par, par->info->device,
|
|
s16, &par->init_sequence[i + 1], j,
|
|
"init: write(0x%02X)", par->init_sequence[i]);
|
|
|
|
/* Write */
|
|
j = 0;
|
|
while (par->init_sequence[i] >= 0) {
|
|
if (j > 63) {
|
|
dev_err(par->info->device,
|
|
"%s: Maximum register values exceeded\n",
|
|
__func__);
|
|
return -EINVAL;
|
|
}
|
|
buf[j++] = par->init_sequence[i++];
|
|
}
|
|
par->fbtftops.write_register(par, j,
|
|
buf[0], buf[1], buf[2], buf[3],
|
|
buf[4], buf[5], buf[6], buf[7],
|
|
buf[8], buf[9], buf[10], buf[11],
|
|
buf[12], buf[13], buf[14], buf[15],
|
|
buf[16], buf[17], buf[18], buf[19],
|
|
buf[20], buf[21], buf[22], buf[23],
|
|
buf[24], buf[25], buf[26], buf[27],
|
|
buf[28], buf[29], buf[30], buf[31],
|
|
buf[32], buf[33], buf[34], buf[35],
|
|
buf[36], buf[37], buf[38], buf[39],
|
|
buf[40], buf[41], buf[42], buf[43],
|
|
buf[44], buf[45], buf[46], buf[47],
|
|
buf[48], buf[49], buf[50], buf[51],
|
|
buf[52], buf[53], buf[54], buf[55],
|
|
buf[56], buf[57], buf[58], buf[59],
|
|
buf[60], buf[61], buf[62], buf[63]);
|
|
break;
|
|
case -2:
|
|
i++;
|
|
fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
|
|
"init: mdelay(%d)\n",
|
|
par->init_sequence[i]);
|
|
mdelay(par->init_sequence[i++]);
|
|
break;
|
|
default:
|
|
dev_err(par->info->device,
|
|
"unknown delimiter %d at position %d\n",
|
|
par->init_sequence[i], i);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
dev_err(par->info->device,
|
|
"%s: something is wrong. Shouldn't get here.\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL(fbtft_init_display);
|
|
|
|
/**
|
|
* fbtft_verify_gpios() - Generic verify_gpios() function
|
|
* @par: Driver data
|
|
*
|
|
* Uses @spi, @pdev and @buswidth to determine which GPIOs is needed
|
|
*
|
|
* Return: 0 if successful, negative if error
|
|
*/
|
|
static int fbtft_verify_gpios(struct fbtft_par *par)
|
|
{
|
|
struct fbtft_platform_data *pdata = par->pdata;
|
|
int i;
|
|
|
|
fbtft_par_dbg(DEBUG_VERIFY_GPIOS, par, "%s()\n", __func__);
|
|
|
|
if (pdata->display.buswidth != 9 && par->startbyte == 0 &&
|
|
!par->gpio.dc) {
|
|
dev_err(par->info->device,
|
|
"Missing info about 'dc' gpio. Aborting.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!par->pdev)
|
|
return 0;
|
|
|
|
if (!par->gpio.wr) {
|
|
dev_err(par->info->device, "Missing 'wr' gpio. Aborting.\n");
|
|
return -EINVAL;
|
|
}
|
|
for (i = 0; i < pdata->display.buswidth; i++) {
|
|
if (!par->gpio.db[i]) {
|
|
dev_err(par->info->device,
|
|
"Missing 'db%02d' gpio. Aborting.\n", i);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* returns 0 if the property is not present */
|
|
static u32 fbtft_property_value(struct device *dev, const char *propname)
|
|
{
|
|
int ret;
|
|
u32 val = 0;
|
|
|
|
ret = device_property_read_u32(dev, propname, &val);
|
|
if (ret == 0)
|
|
dev_info(dev, "%s: %s = %u\n", __func__, propname, val);
|
|
|
|
return val;
|
|
}
|
|
|
|
static struct fbtft_platform_data *fbtft_properties_read(struct device *dev)
|
|
{
|
|
struct fbtft_platform_data *pdata;
|
|
|
|
if (!dev_fwnode(dev)) {
|
|
dev_err(dev, "Missing platform data or properties\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
pdata->display.width = fbtft_property_value(dev, "width");
|
|
pdata->display.height = fbtft_property_value(dev, "height");
|
|
pdata->display.regwidth = fbtft_property_value(dev, "regwidth");
|
|
pdata->display.buswidth = fbtft_property_value(dev, "buswidth");
|
|
pdata->display.backlight = fbtft_property_value(dev, "backlight");
|
|
pdata->display.bpp = fbtft_property_value(dev, "bpp");
|
|
pdata->display.debug = fbtft_property_value(dev, "debug");
|
|
pdata->rotate = fbtft_property_value(dev, "rotate");
|
|
pdata->bgr = device_property_read_bool(dev, "bgr");
|
|
pdata->fps = fbtft_property_value(dev, "fps");
|
|
pdata->txbuflen = fbtft_property_value(dev, "txbuflen");
|
|
pdata->startbyte = fbtft_property_value(dev, "startbyte");
|
|
device_property_read_string(dev, "gamma", (const char **)&pdata->gamma);
|
|
|
|
if (device_property_present(dev, "led-gpios"))
|
|
pdata->display.backlight = 1;
|
|
if (device_property_present(dev, "init"))
|
|
pdata->display.fbtftops.init_display =
|
|
fbtft_init_display_from_property;
|
|
|
|
pdata->display.fbtftops.request_gpios = fbtft_request_gpios;
|
|
|
|
return pdata;
|
|
}
|
|
|
|
/**
|
|
* fbtft_probe_common() - Generic device probe() helper function
|
|
* @display: Display properties
|
|
* @sdev: SPI device
|
|
* @pdev: Platform device
|
|
*
|
|
* Allocates, initializes and registers a framebuffer
|
|
*
|
|
* Either @sdev or @pdev should be NULL
|
|
*
|
|
* Return: 0 if successful, negative if error
|
|
*/
|
|
int fbtft_probe_common(struct fbtft_display *display,
|
|
struct spi_device *sdev,
|
|
struct platform_device *pdev)
|
|
{
|
|
struct device *dev;
|
|
struct fb_info *info;
|
|
struct fbtft_par *par;
|
|
struct fbtft_platform_data *pdata;
|
|
int ret;
|
|
|
|
if (sdev)
|
|
dev = &sdev->dev;
|
|
else
|
|
dev = &pdev->dev;
|
|
|
|
if (unlikely(display->debug & DEBUG_DRIVER_INIT_FUNCTIONS))
|
|
dev_info(dev, "%s()\n", __func__);
|
|
|
|
pdata = dev->platform_data;
|
|
if (!pdata) {
|
|
pdata = fbtft_properties_read(dev);
|
|
if (IS_ERR(pdata))
|
|
return PTR_ERR(pdata);
|
|
}
|
|
|
|
info = fbtft_framebuffer_alloc(display, dev, pdata);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
par = info->par;
|
|
par->spi = sdev;
|
|
par->pdev = pdev;
|
|
|
|
if (display->buswidth == 0) {
|
|
dev_err(dev, "buswidth is not set\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* write register functions */
|
|
if (display->regwidth == 8 && display->buswidth == 8)
|
|
par->fbtftops.write_register = fbtft_write_reg8_bus8;
|
|
else if (display->regwidth == 8 && display->buswidth == 9 && par->spi)
|
|
par->fbtftops.write_register = fbtft_write_reg8_bus9;
|
|
else if (display->regwidth == 16 && display->buswidth == 8)
|
|
par->fbtftops.write_register = fbtft_write_reg16_bus8;
|
|
else if (display->regwidth == 16 && display->buswidth == 16)
|
|
par->fbtftops.write_register = fbtft_write_reg16_bus16;
|
|
else
|
|
dev_warn(dev,
|
|
"no default functions for regwidth=%d and buswidth=%d\n",
|
|
display->regwidth, display->buswidth);
|
|
|
|
/* write_vmem() functions */
|
|
if (display->buswidth == 8)
|
|
par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
|
|
else if (display->buswidth == 9)
|
|
par->fbtftops.write_vmem = fbtft_write_vmem16_bus9;
|
|
else if (display->buswidth == 16)
|
|
par->fbtftops.write_vmem = fbtft_write_vmem16_bus16;
|
|
|
|
/* GPIO write() functions */
|
|
if (par->pdev) {
|
|
if (display->buswidth == 8)
|
|
par->fbtftops.write = fbtft_write_gpio8_wr;
|
|
else if (display->buswidth == 16)
|
|
par->fbtftops.write = fbtft_write_gpio16_wr;
|
|
}
|
|
|
|
/* 9-bit SPI setup */
|
|
if (par->spi && display->buswidth == 9) {
|
|
if (par->spi->master->bits_per_word_mask & SPI_BPW_MASK(9)) {
|
|
par->spi->bits_per_word = 9;
|
|
} else {
|
|
dev_warn(&par->spi->dev,
|
|
"9-bit SPI not available, emulating using 8-bit.\n");
|
|
/* allocate buffer with room for dc bits */
|
|
par->extra = devm_kzalloc(par->info->device,
|
|
par->txbuf.len +
|
|
(par->txbuf.len / 8) + 8,
|
|
GFP_KERNEL);
|
|
if (!par->extra) {
|
|
ret = -ENOMEM;
|
|
goto out_release;
|
|
}
|
|
par->fbtftops.write = fbtft_write_spi_emulate_9;
|
|
}
|
|
}
|
|
|
|
if (!par->fbtftops.verify_gpios)
|
|
par->fbtftops.verify_gpios = fbtft_verify_gpios;
|
|
|
|
/* make sure we still use the driver provided functions */
|
|
fbtft_merge_fbtftops(&par->fbtftops, &display->fbtftops);
|
|
|
|
/* use init_sequence if provided */
|
|
if (par->init_sequence)
|
|
par->fbtftops.init_display = fbtft_init_display;
|
|
|
|
/* use platform_data provided functions above all */
|
|
fbtft_merge_fbtftops(&par->fbtftops, &pdata->display.fbtftops);
|
|
|
|
ret = fbtft_register_framebuffer(info);
|
|
if (ret < 0)
|
|
goto out_release;
|
|
|
|
return 0;
|
|
|
|
out_release:
|
|
fbtft_framebuffer_release(info);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(fbtft_probe_common);
|
|
|
|
/**
|
|
* fbtft_remove_common() - Generic device remove() helper function
|
|
* @dev: Device
|
|
* @info: Framebuffer
|
|
*
|
|
* Unregisters and releases the framebuffer
|
|
*/
|
|
void fbtft_remove_common(struct device *dev, struct fb_info *info)
|
|
{
|
|
struct fbtft_par *par;
|
|
|
|
par = info->par;
|
|
if (par)
|
|
fbtft_par_dbg(DEBUG_DRIVER_INIT_FUNCTIONS, par,
|
|
"%s()\n", __func__);
|
|
fbtft_unregister_framebuffer(info);
|
|
fbtft_framebuffer_release(info);
|
|
}
|
|
EXPORT_SYMBOL(fbtft_remove_common);
|
|
|
|
MODULE_LICENSE("GPL");
|