--- /dev/null
+/*
+ * Copyright (C) 2013 Noralf Tronnes
+ *
+ * This driver is inspired by:
+ * st7735fb.c, Copyright (C) 2011, Matt Porter
+ * broadsheetfb.c, Copyright (C) 2008, Jaya Kumar
+ *
+ * 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/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/fb.h>
+#include <linux/gpio.h>
+#include <linux/spi/spi.h>
+#include <linux/delay.h>
+#include <linux/uaccess.h>
+#include <linux/backlight.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/dma-mapping.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+
+#include "fbtft.h"
+#include "internal.h"
+
+static unsigned long debug;
+module_param(debug, ulong, 0);
+MODULE_PARM_DESC(debug, "override device debug level");
+
+static bool dma = true;
+module_param(dma, bool, 0);
+MODULE_PARM_DESC(dma, "Use DMA buffer");
+
+
+void fbtft_dbg_hex(const struct device *dev, int groupsize,
+ void *buf, size_t len, const char *fmt, ...)
+{
+ va_list args;
+ static char textbuf[512];
+ char *text = textbuf;
+ size_t text_len;
+
+ va_start(args, fmt);
+ text_len = vscnprintf(text, sizeof(textbuf), fmt, args);
+ va_end(args);
+
+ hex_dump_to_buffer(buf, len, 32, groupsize, text + text_len,
+ 512 - text_len, false);
+
+ if (len > 32)
+ dev_info(dev, "%s ...\n", text);
+ else
+ dev_info(dev, "%s\n", text);
+}
+EXPORT_SYMBOL(fbtft_dbg_hex);
+
+static unsigned long fbtft_request_gpios_match(struct fbtft_par *par,
+ const struct fbtft_gpio *gpio)
+{
+ int ret;
+ long val;
+
+ fbtft_par_dbg(DEBUG_REQUEST_GPIOS_MATCH, par, "%s('%s')\n",
+ __func__, gpio->name);
+
+ if (strcasecmp(gpio->name, "reset") == 0) {
+ par->gpio.reset = gpio->gpio;
+ return GPIOF_OUT_INIT_HIGH;
+ } else if (strcasecmp(gpio->name, "dc") == 0) {
+ par->gpio.dc = gpio->gpio;
+ return GPIOF_OUT_INIT_LOW;
+ } else if (strcasecmp(gpio->name, "cs") == 0) {
+ par->gpio.cs = gpio->gpio;
+ return GPIOF_OUT_INIT_HIGH;
+ } else if (strcasecmp(gpio->name, "wr") == 0) {
+ par->gpio.wr = gpio->gpio;
+ return GPIOF_OUT_INIT_HIGH;
+ } else if (strcasecmp(gpio->name, "rd") == 0) {
+ par->gpio.rd = gpio->gpio;
+ return GPIOF_OUT_INIT_HIGH;
+ } else if (strcasecmp(gpio->name, "latch") == 0) {
+ par->gpio.latch = gpio->gpio;
+ return GPIOF_OUT_INIT_LOW;
+ } else if (gpio->name[0] == 'd' && gpio->name[1] == 'b') {
+ ret = kstrtol(&gpio->name[2], 10, &val);
+ if (ret == 0 && val < 16) {
+ par->gpio.db[val] = gpio->gpio;
+ return GPIOF_OUT_INIT_LOW;
+ }
+ } else if (strcasecmp(gpio->name, "led") == 0) {
+ par->gpio.led[0] = gpio->gpio;
+ return GPIOF_OUT_INIT_LOW;
+ } else if (strcasecmp(gpio->name, "led_") == 0) {
+ par->gpio.led[0] = gpio->gpio;
+ return GPIOF_OUT_INIT_HIGH;
+ }
+
+ return FBTFT_GPIO_NO_MATCH;
+}
+
+static int fbtft_request_gpios(struct fbtft_par *par)
+{
+ struct fbtft_platform_data *pdata = par->pdata;
+ const struct fbtft_gpio *gpio;
+ unsigned long flags;
+ int ret;
+
+ if (pdata && pdata->gpios) {
+ gpio = pdata->gpios;
+ while (gpio->name[0]) {
+ flags = FBTFT_GPIO_NO_MATCH;
+ /* if driver provides match function, try it first,
+ if no match use our own */
+ if (par->fbtftops.request_gpios_match)
+ flags = par->fbtftops.request_gpios_match(par, gpio);
+ if (flags == FBTFT_GPIO_NO_MATCH)
+ flags = fbtft_request_gpios_match(par, gpio);
+ if (flags != FBTFT_GPIO_NO_MATCH) {
+ ret = devm_gpio_request_one(par->info->device,
+ gpio->gpio, flags,
+ par->info->device->driver->name);
+ if (ret < 0) {
+ dev_err(par->info->device,
+ "%s: gpio_request_one('%s'=%d) failed with %d\n",
+ __func__, gpio->name,
+ gpio->gpio, ret);
+ return ret;
+ }
+ fbtft_par_dbg(DEBUG_REQUEST_GPIOS, par,
+ "%s: '%s' = GPIO%d\n",
+ __func__, gpio->name, gpio->gpio);
+ }
+ gpio++;
+ }
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static int fbtft_request_one_gpio(struct fbtft_par *par,
+ const char *name, int index, int *gpiop)
+{
+ struct device *dev = par->info->device;
+ struct device_node *node = dev->of_node;
+ int gpio, flags, ret = 0;
+ enum of_gpio_flags of_flags;
+
+ if (of_find_property(node, name, NULL)) {
+ gpio = of_get_named_gpio_flags(node, name, index, &of_flags);
+ if (gpio == -ENOENT)
+ return 0;
+ if (gpio == -EPROBE_DEFER)
+ return gpio;
+ if (gpio < 0) {
+ dev_err(dev,
+ "failed to get '%s' from DT\n", name);
+ return gpio;
+ }
+
+ /* active low translates to initially low */
+ flags = (of_flags & OF_GPIO_ACTIVE_LOW) ? GPIOF_OUT_INIT_LOW :
+ GPIOF_OUT_INIT_HIGH;
+ ret = devm_gpio_request_one(dev, gpio, flags,
+ dev->driver->name);
+ if (ret) {
+ dev_err(dev,
+ "gpio_request_one('%s'=%d) failed with %d\n",
+ name, gpio, ret);
+ return ret;
+ }
+ if (gpiop)
+ *gpiop = gpio;
+ fbtft_par_dbg(DEBUG_REQUEST_GPIOS, par, "%s: '%s' = GPIO%d\n",
+ __func__, name, gpio);
+ }
+
+ return ret;
+}
+
+static int fbtft_request_gpios_dt(struct fbtft_par *par)
+{
+ int i;
+ int ret;
+
+ if (!par->info->device->of_node)
+ return -EINVAL;
+
+ ret = fbtft_request_one_gpio(par, "reset-gpios", 0, &par->gpio.reset);
+ if (ret)
+ return ret;
+ ret = fbtft_request_one_gpio(par, "dc-gpios", 0, &par->gpio.dc);
+ if (ret)
+ return ret;
+ ret = fbtft_request_one_gpio(par, "rd-gpios", 0, &par->gpio.rd);
+ if (ret)
+ return ret;
+ ret = fbtft_request_one_gpio(par, "wr-gpios", 0, &par->gpio.wr);
+ if (ret)
+ return ret;
+ ret = fbtft_request_one_gpio(par, "cs-gpios", 0, &par->gpio.cs);
+ if (ret)
+ return ret;
+ ret = fbtft_request_one_gpio(par, "latch-gpios", 0, &par->gpio.latch);
+ if (ret)
+ return ret;
+ for (i = 0; i < 16; i++) {
+ ret = fbtft_request_one_gpio(par, "db-gpios", i,
+ &par->gpio.db[i]);
+ if (ret)
+ return ret;
+ ret = fbtft_request_one_gpio(par, "led-gpios", i,
+ &par->gpio.led[i]);
+ if (ret)
+ return ret;
+ ret = fbtft_request_one_gpio(par, "aux-gpios", i,
+ &par->gpio.aux[i]);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_FB_BACKLIGHT
+static int fbtft_backlight_update_status(struct backlight_device *bd)
+{
+ struct fbtft_par *par = bl_get_data(bd);
+ bool polarity = !!(bd->props.state & BL_CORE_DRIVER1);
+
+ fbtft_par_dbg(DEBUG_BACKLIGHT, par,
+ "%s: polarity=%d, power=%d, fb_blank=%d\n",
+ __func__, polarity, bd->props.power, bd->props.fb_blank);
+
+ if ((bd->props.power == FB_BLANK_UNBLANK) && (bd->props.fb_blank == FB_BLANK_UNBLANK))
+ gpio_set_value(par->gpio.led[0], polarity);
+ else
+ gpio_set_value(par->gpio.led[0], !polarity);
+
+ return 0;
+}
+
+static int fbtft_backlight_get_brightness(struct backlight_device *bd)
+{
+ return bd->props.brightness;
+}
+
+void fbtft_unregister_backlight(struct fbtft_par *par)
+{
+ const struct backlight_ops *bl_ops;
+
+ fbtft_par_dbg(DEBUG_BACKLIGHT, par, "%s()\n", __func__);
+
+ if (par->info->bl_dev) {
+ par->info->bl_dev->props.power = FB_BLANK_POWERDOWN;
+ backlight_update_status(par->info->bl_dev);
+ bl_ops = par->info->bl_dev->ops;
+ backlight_device_unregister(par->info->bl_dev);
+ par->info->bl_dev = NULL;
+ }
+}
+
+void fbtft_register_backlight(struct fbtft_par *par)
+{
+ struct backlight_device *bd;
+ struct backlight_properties bl_props = { 0, };
+ struct backlight_ops *bl_ops;
+
+ fbtft_par_dbg(DEBUG_BACKLIGHT, par, "%s()\n", __func__);
+
+ if (par->gpio.led[0] == -1) {
+ fbtft_par_dbg(DEBUG_BACKLIGHT, par,
+ "%s(): led pin not set, exiting.\n", __func__);
+ return;
+ }
+
+ bl_ops = devm_kzalloc(par->info->device, sizeof(struct backlight_ops),
+ GFP_KERNEL);
+ if (!bl_ops)
+ return;
+
+ bl_ops->get_brightness = fbtft_backlight_get_brightness;
+ bl_ops->update_status = fbtft_backlight_update_status;
+ bl_props.type = BACKLIGHT_RAW;
+ /* Assume backlight is off, get polarity from current state of pin */
+ bl_props.power = FB_BLANK_POWERDOWN;
+ if (!gpio_get_value(par->gpio.led[0]))
+ bl_props.state |= BL_CORE_DRIVER1;
+
+ bd = backlight_device_register(dev_driver_string(par->info->device),
+ par->info->device, par, bl_ops, &bl_props);
+ if (IS_ERR(bd)) {
+ dev_err(par->info->device,
+ "cannot register backlight device (%ld)\n",
+ PTR_ERR(bd));
+ return;
+ }
+ par->info->bl_dev = bd;
+
+ if (!par->fbtftops.unregister_backlight)
+ par->fbtftops.unregister_backlight = fbtft_unregister_backlight;
+}
+#else
+void fbtft_register_backlight(struct fbtft_par *par) { };
+void fbtft_unregister_backlight(struct fbtft_par *par) { };
+#endif
+EXPORT_SYMBOL(fbtft_register_backlight);
+EXPORT_SYMBOL(fbtft_unregister_backlight);
+
+static void fbtft_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);
+
+ /* Column address set */
+ write_reg(par, 0x2A,
+ (xs >> 8) & 0xFF, xs & 0xFF, (xe >> 8) & 0xFF, xe & 0xFF);
+
+ /* Row address set */
+ write_reg(par, 0x2B,
+ (ys >> 8) & 0xFF, ys & 0xFF, (ye >> 8) & 0xFF, ye & 0xFF);
+
+ /* Memory write */
+ write_reg(par, 0x2C);
+}
+
+
+static void fbtft_reset(struct fbtft_par *par)
+{
+ if (par->gpio.reset == -1)
+ return;
+ fbtft_par_dbg(DEBUG_RESET, par, "%s()\n", __func__);
+ gpio_set_value(par->gpio.reset, 0);
+ udelay(20);
+ gpio_set_value(par->gpio.reset, 1);
+ mdelay(120);
+}
+
+
+static void fbtft_update_display(struct fbtft_par *par, unsigned start_line,
+ unsigned end_line)
+{
+ size_t offset, len;
+ struct timespec ts_start, ts_end, ts_fps, ts_duration;
+ long fps_ms, fps_us, duration_ms, duration_us;
+ long fps, throughput;
+ bool timeit = false;
+ int ret = 0;
+
+ if (unlikely(par->debug & (DEBUG_TIME_FIRST_UPDATE | DEBUG_TIME_EACH_UPDATE))) {
+ if ((par->debug & DEBUG_TIME_EACH_UPDATE) ||
+ ((par->debug & DEBUG_TIME_FIRST_UPDATE) && !par->first_update_done)) {
+ getnstimeofday(&ts_start);
+ timeit = true;
+ }
+ }
+
+ /* Sanity checks */
+ if (start_line > end_line) {
+ dev_warn(par->info->device,
+ "%s: start_line=%u is larger than end_line=%u. Shouldn't happen, will do full display update\n",
+ __func__, start_line, end_line);
+ start_line = 0;
+ end_line = par->info->var.yres - 1;
+ }
+ if (start_line > par->info->var.yres - 1 || end_line > par->info->var.yres - 1) {
+ dev_warn(par->info->device,
+ "%s: start_line=%u or end_line=%u is larger than max=%d. Shouldn't happen, will do full display update\n",
+ __func__, start_line, end_line, par->info->var.yres - 1);
+ start_line = 0;
+ end_line = par->info->var.yres - 1;
+ }
+
+ fbtft_par_dbg(DEBUG_UPDATE_DISPLAY, par, "%s(start_line=%u, end_line=%u)\n",
+ __func__, start_line, end_line);
+
+ if (par->fbtftops.set_addr_win)
+ par->fbtftops.set_addr_win(par, 0, start_line,
+ par->info->var.xres-1, end_line);
+
+ offset = start_line * par->info->fix.line_length;
+ len = (end_line - start_line + 1) * par->info->fix.line_length;
+ ret = par->fbtftops.write_vmem(par, offset, len);
+ if (ret < 0)
+ dev_err(par->info->device,
+ "%s: write_vmem failed to update display buffer\n",
+ __func__);
+
+ if (unlikely(timeit)) {
+ getnstimeofday(&ts_end);
+ if (par->update_time.tv_nsec == 0 && par->update_time.tv_sec == 0) {
+ par->update_time.tv_sec = ts_start.tv_sec;
+ par->update_time.tv_nsec = ts_start.tv_nsec;
+ }
+ ts_fps = timespec_sub(ts_start, par->update_time);
+ par->update_time.tv_sec = ts_start.tv_sec;
+ par->update_time.tv_nsec = ts_start.tv_nsec;
+ fps_ms = (ts_fps.tv_sec * 1000) + ((ts_fps.tv_nsec / 1000000) % 1000);
+ fps_us = (ts_fps.tv_nsec / 1000) % 1000;
+ fps = fps_ms * 1000 + fps_us;
+ fps = fps ? 1000000 / fps : 0;
+
+ ts_duration = timespec_sub(ts_end, ts_start);
+ duration_ms = (ts_duration.tv_sec * 1000) + ((ts_duration.tv_nsec / 1000000) % 1000);
+ duration_us = (ts_duration.tv_nsec / 1000) % 1000;
+ throughput = duration_ms * 1000 + duration_us;
+ throughput = throughput ? (len * 1000) / throughput : 0;
+ throughput = throughput * 1000 / 1024;
+
+ dev_info(par->info->device,
+ "Display update: %ld kB/s (%ld.%.3ld ms), fps=%ld (%ld.%.3ld ms)\n",
+ throughput, duration_ms, duration_us,
+ fps, fps_ms, fps_us);
+ par->first_update_done = true;
+ }
+}
+
+
+static void fbtft_mkdirty(struct fb_info *info, int y, int height)
+{
+ struct fbtft_par *par = info->par;
+ struct fb_deferred_io *fbdefio = info->fbdefio;
+
+ /* special case, needed ? */
+ if (y == -1) {
+ y = 0;
+ height = info->var.yres - 1;
+ }
+
+ /* Mark display lines/area as dirty */
+ spin_lock(&par->dirty_lock);
+ if (y < par->dirty_lines_start)
+ par->dirty_lines_start = y;
+ if (y + height - 1 > par->dirty_lines_end)
+ par->dirty_lines_end = y + height - 1;
+ spin_unlock(&par->dirty_lock);
+
+ /* Schedule deferred_io to update display (no-op if already on queue)*/
+ schedule_delayed_work(&info->deferred_work, fbdefio->delay);
+}
+
+static void fbtft_deferred_io(struct fb_info *info, struct list_head *pagelist)
+{
+ struct fbtft_par *par = info->par;
+ unsigned dirty_lines_start, dirty_lines_end;
+ struct page *page;
+ unsigned long index;
+ unsigned y_low = 0, y_high = 0;
+ int count = 0;
+
+ spin_lock(&par->dirty_lock);
+ dirty_lines_start = par->dirty_lines_start;
+ dirty_lines_end = par->dirty_lines_end;
+ /* set display line markers as clean */
+ par->dirty_lines_start = par->info->var.yres - 1;
+ par->dirty_lines_end = 0;
+ spin_unlock(&par->dirty_lock);
+
+ /* Mark display lines as dirty */
+ list_for_each_entry(page, pagelist, lru) {
+ count++;
+ index = page->index << PAGE_SHIFT;
+ y_low = index / info->fix.line_length;
+ y_high = (index + PAGE_SIZE - 1) / info->fix.line_length;
+ fbtft_dev_dbg(DEBUG_DEFERRED_IO, par, info->device,
+ "page->index=%lu y_low=%d y_high=%d\n",
+ page->index, y_low, y_high);
+ if (y_high > info->var.yres - 1)
+ y_high = info->var.yres - 1;
+ if (y_low < dirty_lines_start)
+ dirty_lines_start = y_low;
+ if (y_high > dirty_lines_end)
+ dirty_lines_end = y_high;
+ }
+
+ par->fbtftops.update_display(info->par,
+ dirty_lines_start, dirty_lines_end);
+}
+
+
+static void fbtft_fb_fillrect(struct fb_info *info,
+ const struct fb_fillrect *rect)
+{
+ struct fbtft_par *par = info->par;
+
+ fbtft_dev_dbg(DEBUG_FB_FILLRECT, par, info->dev,
+ "%s: dx=%d, dy=%d, width=%d, height=%d\n",
+ __func__, rect->dx, rect->dy, rect->width, rect->height);
+ sys_fillrect(info, rect);
+
+ par->fbtftops.mkdirty(info, rect->dy, rect->height);
+}
+
+static void fbtft_fb_copyarea(struct fb_info *info,
+ const struct fb_copyarea *area)
+{
+ struct fbtft_par *par = info->par;
+
+ fbtft_dev_dbg(DEBUG_FB_COPYAREA, par, info->dev,
+ "%s: dx=%d, dy=%d, width=%d, height=%d\n",
+ __func__, area->dx, area->dy, area->width, area->height);
+ sys_copyarea(info, area);
+
+ par->fbtftops.mkdirty(info, area->dy, area->height);
+}
+
+static void fbtft_fb_imageblit(struct fb_info *info,
+ const struct fb_image *image)
+{
+ struct fbtft_par *par = info->par;
+
+ fbtft_dev_dbg(DEBUG_FB_IMAGEBLIT, par, info->dev,
+ "%s: dx=%d, dy=%d, width=%d, height=%d\n",
+ __func__, image->dx, image->dy, image->width, image->height);
+ sys_imageblit(info, image);
+
+ par->fbtftops.mkdirty(info, image->dy, image->height);
+}
+
+static ssize_t fbtft_fb_write(struct fb_info *info, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct fbtft_par *par = info->par;
+ ssize_t res;
+
+ fbtft_dev_dbg(DEBUG_FB_WRITE, par, info->dev,
+ "%s: count=%zd, ppos=%llu\n", __func__, count, *ppos);
+ res = fb_sys_write(info, buf, count, ppos);
+
+ /* TODO: only mark changed area
+ update all for now */
+ par->fbtftops.mkdirty(info, -1, 0);
+
+ return res;
+}
+
+/* from pxafb.c */
+static unsigned int chan_to_field(unsigned chan, struct fb_bitfield *bf)
+{
+ chan &= 0xffff;
+ chan >>= 16 - bf->length;
+ return chan << bf->offset;
+}
+
+static int fbtft_fb_setcolreg(unsigned regno, unsigned red, unsigned green,
+ unsigned blue, unsigned transp,
+ struct fb_info *info)
+{
+ struct fbtft_par *par = info->par;
+ unsigned val;
+ int ret = 1;
+
+ fbtft_dev_dbg(DEBUG_FB_SETCOLREG, par, info->dev,
+ "%s(regno=%u, red=0x%X, green=0x%X, blue=0x%X, trans=0x%X)\n",
+ __func__, regno, red, green, blue, transp);
+
+ switch (info->fix.visual) {
+ case FB_VISUAL_TRUECOLOR:
+ if (regno < 16) {
+ u32 *pal = info->pseudo_palette;
+
+ val = chan_to_field(red, &info->var.red);
+ val |= chan_to_field(green, &info->var.green);
+ val |= chan_to_field(blue, &info->var.blue);
+
+ pal[regno] = val;
+ ret = 0;
+ }
+ break;
+
+ }
+ return ret;
+}
+
+static int fbtft_fb_blank(int blank, struct fb_info *info)
+{
+ struct fbtft_par *par = info->par;
+ int ret = -EINVAL;
+
+ fbtft_dev_dbg(DEBUG_FB_BLANK, par, info->dev, "%s(blank=%d)\n",
+ __func__, blank);
+
+ if (!par->fbtftops.blank)
+ return ret;
+
+ switch (blank) {
+ case FB_BLANK_POWERDOWN:
+ case FB_BLANK_VSYNC_SUSPEND:
+ case FB_BLANK_HSYNC_SUSPEND:
+ case FB_BLANK_NORMAL:
+ ret = par->fbtftops.blank(par, true);
+ break;
+ case FB_BLANK_UNBLANK:
+ ret = par->fbtftops.blank(par, false);
+ 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
+ *
+ * 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 fb_info *info;
+ struct fbtft_par *par;
+ struct fb_ops *fbops = NULL;
+ struct fb_deferred_io *fbdefio = NULL;
+ struct fbtft_platform_data *pdata = dev->platform_data;
+ u8 *vmem = NULL;
+ void *txbuf = NULL;
+ void *buf = NULL;
+ unsigned width;
+ unsigned height;
+ int txbuflen = display->txbuflen;
+ unsigned bpp = display->bpp;
+ unsigned fps = display->fps;
+ int vmem_size, i;
+ int *init_sequence = display->init_sequence;
+ char *gamma = display->gamma;
+ unsigned long *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_kzalloc(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_base = (u8 __force __iomem *)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;
+
+ fbdefio->delay = HZ/fps;
+ fbdefio->deferred_io = fbtft_deferred_io;
+ fb_deferred_io_init(info);
+
+ strncpy(info->fix.id, dev->driver->name, 16);
+ 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;
+
+ 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 = dev->platform_data;
+ 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 alloc_fail;
+ }
+
+ /* Transmit buffer */
+ if (txbuflen == -1)
+ txbuflen = vmem_size + 2; /* add in case startbyte is used */
+
+#ifdef __LITTLE_ENDIAN
+ if ((!txbuflen) && (bpp > 8))
+ txbuflen = PAGE_SIZE; /* need buffer for byteswapping */
+#endif
+
+ if (txbuflen > 0) {
+ if (dma) {
+ dev->coherent_dma_mask = ~0;
+ txbuf = dmam_alloc_coherent(dev, txbuflen, &par->txbuf.dma, GFP_DMA);
+ } else {
+ txbuf = devm_kzalloc(par->info->device, txbuflen, GFP_KERNEL);
+ }
+ if (!txbuf)
+ goto alloc_fail;
+ par->txbuf.buf = txbuf;
+ par->txbuf.len = txbuflen;
+ }
+
+ /* Initialize gpios to disabled */
+ par->gpio.reset = -1;
+ par->gpio.dc = -1;
+ par->gpio.rd = -1;
+ par->gpio.wr = -1;
+ par->gpio.cs = -1;
+ par->gpio.latch = -1;
+ for (i = 0; i < 16; i++) {
+ par->gpio.db[i] = -1;
+ par->gpio.led[i] = -1;
+ par->gpio.aux[i] = -1;
+ }
+
+ /* 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;
+ par->fbtftops.request_gpios = fbtft_request_gpios;
+ if (display->backlight)
+ par->fbtftops.register_backlight = fbtft_register_backlight;
+
+ /* use driver provided functions */
+ fbtft_merge_fbtftops(&par->fbtftops, &display->fbtftops);
+
+ return 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_base);
+ 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)
+ sprintf(text1, ", %zu KiB %sbuffer memory",
+ par->txbuf.len >> 10, par->txbuf.dma ? "DMA " : "");
+ 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);
+
+#ifdef CONFIG_FB_BACKLIGHT
+ /* 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);
+ }
+#endif
+
+ return 0;
+
+reg_fail:
+ if (par->fbtftops.unregister_backlight)
+ par->fbtftops.unregister_backlight(par);
+ if (spi)
+ spi_set_drvdata(spi, NULL);
+ if (par->pdev)
+ platform_set_drvdata(par->pdev, NULL);
+
+ 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;
+ struct spi_device *spi = par->spi;
+
+ if (spi)
+ spi_set_drvdata(spi, NULL);
+ if (par->pdev)
+ platform_set_drvdata(par->pdev, NULL);
+ if (par->fbtftops.unregister_backlight)
+ par->fbtftops.unregister_backlight(par);
+ fbtft_sysfs_exit(par);
+ return unregister_framebuffer(fb_info);
+}
+EXPORT_SYMBOL(fbtft_unregister_framebuffer);
+
+#ifdef CONFIG_OF
+/**
+ * fbtft_init_display_dt() - Device Tree init_display() function
+ * @par: Driver data
+ *
+ * Return: 0 if successful, negative if error
+ */
+static int fbtft_init_display_dt(struct fbtft_par *par)
+{
+ struct device_node *node = par->info->device->of_node;
+ struct property *prop;
+ const __be32 *p;
+ u32 val;
+ int buf[64], i, j;
+ char msg[128];
+ char str[16];
+
+ fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+ if (!node)
+ return -EINVAL;
+
+ prop = of_find_property(node, "init", NULL);
+ p = of_prop_next_u32(prop, NULL, &val);
+ if (!p)
+ return -EINVAL;
+ while (p) {
+ if (val & FBTFT_OF_INIT_CMD) {
+ val &= 0xFFFF;
+ i = 0;
+ while (p && !(val & 0xFFFF0000)) {
+ if (i > 63) {
+ dev_err(par->info->device,
+ "%s: Maximum register values exceeded\n",
+ __func__);
+ return -EINVAL;
+ }
+ buf[i++] = val;
+ p = of_prop_next_u32(prop, p, &val);
+ }
+ /* make debug message */
+ msg[0] = '\0';
+ for (j = 0; j < i; j++) {
+ snprintf(str, 128, " %02X", buf[j]);
+ strcat(msg, str);
+ }
+ fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
+ "init: write_register:%s\n", msg);
+
+ 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);
+ p = of_prop_next_u32(prop, p, &val);
+ } else {
+ dev_err(par->info->device, "illegal init value 0x%X\n",
+ val);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+#endif
+
+/**
+ * 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];
+ char msg[128];
+ char str[16];
+ int i = 0;
+ int j;
+
+ fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+ /* 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);
+ if (par->gpio.cs != -1)
+ gpio_set_value(par->gpio.cs, 0); /* Activate chip */
+
+ 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 */
+ strcpy(msg, "");
+ j = i + 1;
+ while (par->init_sequence[j] >= 0) {
+ sprintf(str, "0x%02X ", par->init_sequence[j]);
+ strcat(msg, str);
+ j++;
+ }
+ fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
+ "init: write(0x%02X) %s\n",
+ par->init_sequence[i], msg);
+
+ /* 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;
+ int i;
+
+ fbtft_par_dbg(DEBUG_VERIFY_GPIOS, par, "%s()\n", __func__);
+
+ pdata = par->info->device->platform_data;
+ if (pdata->display.buswidth != 9 && par->startbyte == 0 &&
+ par->gpio.dc < 0) {
+ dev_err(par->info->device,
+ "Missing info about 'dc' gpio. Aborting.\n");
+ return -EINVAL;
+ }
+
+ if (!par->pdev)
+ return 0;
+
+ if (par->gpio.wr < 0) {
+ 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] < 0) {
+ dev_err(par->info->device,
+ "Missing 'db%02d' gpio. Aborting.\n", i);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+/* returns 0 if the property is not present */
+static u32 fbtft_of_value(struct device_node *node, const char *propname)
+{
+ int ret;
+ u32 val = 0;
+
+ ret = of_property_read_u32(node, propname, &val);
+ if (ret == 0)
+ pr_info("%s: %s = %u\n", __func__, propname, val);
+
+ return val;
+}
+
+static struct fbtft_platform_data *fbtft_probe_dt(struct device *dev)
+{
+ struct device_node *node = dev->of_node;
+ struct fbtft_platform_data *pdata;
+
+ if (!node) {
+ dev_err(dev, "Missing platform data or DT\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return ERR_PTR(-ENOMEM);
+
+ pdata->display.width = fbtft_of_value(node, "width");
+ pdata->display.height = fbtft_of_value(node, "height");
+ pdata->display.regwidth = fbtft_of_value(node, "regwidth");
+ pdata->display.buswidth = fbtft_of_value(node, "buswidth");
+ pdata->display.backlight = fbtft_of_value(node, "backlight");
+ pdata->display.bpp = fbtft_of_value(node, "bpp");
+ pdata->display.debug = fbtft_of_value(node, "debug");
+ pdata->rotate = fbtft_of_value(node, "rotate");
+ pdata->bgr = of_property_read_bool(node, "bgr");
+ pdata->fps = fbtft_of_value(node, "fps");
+ pdata->txbuflen = fbtft_of_value(node, "txbuflen");
+ pdata->startbyte = fbtft_of_value(node, "startbyte");
+ of_property_read_string(node, "gamma", (const char **)&pdata->gamma);
+
+ if (of_find_property(node, "led-gpios", NULL))
+ pdata->display.backlight = 1;
+ if (of_find_property(node, "init", NULL))
+ pdata->display.fbtftops.init_display = fbtft_init_display_dt;
+ pdata->display.fbtftops.request_gpios = fbtft_request_gpios_dt;
+
+ return pdata;
+}
+#else
+static struct fbtft_platform_data *fbtft_probe_dt(struct device *dev)
+{
+ dev_err(dev, "Missing platform data\n");
+ return ERR_PTR(-EINVAL);
+}
+#endif
+
+/**
+ * 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_probe_dt(dev);
+ if (IS_ERR(pdata))
+ return PTR_ERR(pdata);
+ dev->platform_data = pdata;
+ }
+
+ info = fbtft_framebuffer_alloc(display, dev);
+ 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) {
+ par->spi->bits_per_word = 9;
+ ret = par->spi->master->setup(par->spi);
+ if (ret) {
+ dev_warn(&par->spi->dev,
+ "9-bit SPI not available, emulating using 8-bit.\n");
+ par->spi->bits_per_word = 8;
+ ret = par->spi->master->setup(par->spi);
+ if (ret)
+ goto out_release;
+ /* 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
+ *
+ * Return: 0 if successful, negative if error
+ */
+int fbtft_remove_common(struct device *dev, struct fb_info *info)
+{
+ struct fbtft_par *par;
+
+ if (!info)
+ return -EINVAL;
+ par = info->par;
+ if (par)
+ fbtft_par_dbg(DEBUG_DRIVER_INIT_FUNCTIONS, par,
+ "%s()\n", __func__);
+ fbtft_unregister_framebuffer(info);
+ fbtft_framebuffer_release(info);
+
+ return 0;
+}
+EXPORT_SYMBOL(fbtft_remove_common);
+
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff