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fbtft-core.c
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fbtft-core.c
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/*
* 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 "fbtft.h"
extern void fbtft_sysfs_init(struct fbtft_par *par);
extern void fbtft_sysfs_exit(struct fbtft_par *par);
extern void fbtft_expand_debug_value(unsigned long *debug);
extern int fbtft_gamma_parse_str(struct fbtft_par *par, unsigned long *curves,
const char *str, int size);
static unsigned long debug;
module_param(debug, ulong , 0);
MODULE_PARM_DESC(debug, "override device debug level");
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);
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;
}
return FBTFT_GPIO_NO_MATCH;
}
int fbtft_request_gpios(struct fbtft_par *par)
{
struct fbtft_platform_data *pdata = par->pdata;
const struct fbtft_gpio *gpio;
unsigned long flags;
int i;
int ret;
/* 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;
}
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 = gpio_request_one(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;
}
void fbtft_free_gpios(struct fbtft_par *par)
{
struct fbtft_platform_data *pdata = NULL;
const struct fbtft_gpio *gpio;
fbtft_par_dbg(DEBUG_FREE_GPIOS, par, "%s()\n", __func__);
if (par->spi)
pdata = par->spi->dev.platform_data;
if (par->pdev)
pdata = par->pdev->dev.platform_data;
if (pdata && pdata->gpios) {
gpio = pdata->gpios;
while (gpio->name[0]) {
fbtft_par_dbg(DEBUG_FREE_GPIOS, par,
"%s(): gpio_free('%s'=%d)\n",
__func__, gpio->name, gpio->gpio);
/* if the gpio wasn't recognized by request_gpios,
WARN() will protest */
gpio_direction_input(gpio->gpio);
gpio_free(gpio->gpio);
gpio++;
}
}
}
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;
}
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) {
bl_ops = par->info->bl_dev->ops;
backlight_device_unregister(par->info->bl_dev);
par->info->bl_dev = NULL;
kfree(bl_ops);
}
}
EXPORT_SYMBOL(fbtft_unregister_backlight);
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 = kzalloc(sizeof(struct backlight_ops), GFP_KERNEL);
if (!bl_ops) {
dev_err(par->info->device,
"%s: could not allocate memeory for backlight operations.\n",
__func__);
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));
goto failed;
}
par->info->bl_dev = bd;
if (!par->fbtftops.unregister_backlight)
par->fbtftops.unregister_backlight = fbtft_unregister_backlight;
return;
failed:
kfree(bl_ops);
}
EXPORT_SYMBOL(fbtft_register_backlight);
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 adress set */
write_reg(par, 0x2B,
(ys >> 8) & 0xFF, ys & 0xFF, (ye >> 8) & 0xFF, ye & 0xFF);
/* Memory write */
write_reg(par, 0x2C);
}
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);
}
void fbtft_update_display(struct fbtft_par *par, unsigned start_line, unsigned end_line)
{
size_t offset, len;
struct timespec ts_start, ts_end, test_of_time;
long ms, us, ns;
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);
test_of_time = timespec_sub(ts_end, ts_start);
us = (test_of_time.tv_nsec / 1000) % 1000;
ms = (test_of_time.tv_sec * 1000) + ((test_of_time.tv_nsec / 1000000) % 1000);
ns = test_of_time.tv_nsec % 1000;
dev_info(par->info->device,
"Elapsed time for display update: %4lu.%.3lu%.3lu ms (fps: %2lu, lines=%u)\n",
ms, us, ns,
test_of_time.tv_nsec ? 1000000000 / test_of_time.tv_nsec : 0,
end_line - start_line + 1);
par->first_update_done = true;
}
}
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);
}
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);
}
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);
}
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);
}
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);
}
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 */
unsigned int chan_to_field(unsigned chan, struct fb_bitfield *bf)
{
chan &= 0xffff;
chan >>= 16 - bf->length;
return chan << bf->offset;
}
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;
}
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;
}
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->free_gpios)
dst->free_gpios = src->free_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;
unsigned rotate = 0;
bool bgr = false;
u8 startbyte = 0;
int vmem_size;
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,
"%s: FBTFT_GAMMA_MAX_VALUES_TOTAL=%d is exceeded\n",
__func__, FBTFT_GAMMA_MAX_VALUES_TOTAL);
return NULL;
}
/* defaults */
if (!fps)
fps = 20;
if (!bpp)
bpp = 16;
vmem_size = display->width*display->height*bpp/8;
/* platform_data override ? */
if (pdata) {
if (pdata->fps)
fps = pdata->fps;
if (pdata->txbuflen)
txbuflen = pdata->txbuflen;
rotate = pdata->rotate;
bgr = pdata->bgr;
startbyte = pdata->startbyte;
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;
}
display->debug |= debug;
fbtft_expand_debug_value(&display->debug);
switch (rotate) {
case 90:
case 270:
width = display->height;
height = display->width;
break;
default:
width = display->width;
height = display->height;
}
vmem = vzalloc(vmem_size);
if (!vmem)
goto alloc_fail;
fbops = kzalloc(sizeof(struct fb_ops), GFP_KERNEL);
if (!fbops)
goto alloc_fail;
fbdefio = kzalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
if (!fbdefio)
goto alloc_fail;
buf = vzalloc(128);
if (!buf)
goto alloc_fail;
if (display->gamma_num && display->gamma_len) {
gamma_curves = kzalloc(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 = 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 = bgr;
par->startbyte = 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)
fbtft_gamma_parse_str(par,
par->gamma.curves, gamma, strlen(gamma));
/* Transmit buffer */
if (txbuflen == -1)
txbuflen = vmem_size;
#ifdef __LITTLE_ENDIAN
if ((!txbuflen) && (bpp > 8))
txbuflen = PAGE_SIZE; /* need buffer for byteswapping */
#endif
if (txbuflen > 0) {
txbuf = kzalloc(txbuflen, GFP_KERNEL);
if (!txbuf)
goto alloc_fail;
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;
par->fbtftops.request_gpios = fbtft_request_gpios;
par->fbtftops.free_gpios = fbtft_free_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:
if (vmem)
vfree(vmem);
if (txbuf)
kfree(txbuf);
if (buf)
vfree(buf);
kfree(fbops);
kfree(fbdefio);
kfree(gamma_curves);
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)
{
struct fbtft_par *par = info->par;
fb_deferred_io_cleanup(info);
vfree(info->screen_base);
if (par->txbuf.buf)
kfree(par->txbuf.buf);
vfree(par->buf);
kfree(info->fbops);
kfree(info->fbdefio);
kfree(par->gamma.curves);
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, ", %d 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);
if (spi)
spi_set_drvdata(spi, NULL);
if (par->pdev)
platform_set_drvdata(par->pdev, NULL);
par->fbtftops.free_gpios(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;
struct spi_device *spi = par->spi;
int ret;
if (spi)
spi_set_drvdata(spi, NULL);
if (par->pdev)
platform_set_drvdata(par->pdev, NULL);
fbtft_sysfs_exit(par);
par->fbtftops.free_gpios(par);
ret = unregister_framebuffer(fb_info);
if (par->fbtftops.unregister_backlight)
par->fbtftops.unregister_backlight(par);
return ret;
}
EXPORT_SYMBOL(fbtft_unregister_framebuffer);
/**
* 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;