Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 Noralf Tronnes |
| 3 | * |
| 4 | * This driver is inspired by: |
| 5 | * st7735fb.c, Copyright (C) 2011, Matt Porter |
| 6 | * broadsheetfb.c, Copyright (C) 2008, Jaya Kumar |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/string.h> |
| 27 | #include <linux/mm.h> |
| 28 | #include <linux/vmalloc.h> |
| 29 | #include <linux/slab.h> |
| 30 | #include <linux/init.h> |
| 31 | #include <linux/fb.h> |
| 32 | #include <linux/gpio.h> |
| 33 | #include <linux/spi/spi.h> |
| 34 | #include <linux/delay.h> |
| 35 | #include <linux/uaccess.h> |
| 36 | #include <linux/backlight.h> |
| 37 | #include <linux/platform_device.h> |
| 38 | #include <linux/spinlock.h> |
| 39 | #include <linux/dma-mapping.h> |
| 40 | #include <linux/of.h> |
| 41 | #include <linux/of_gpio.h> |
| 42 | |
| 43 | #include "fbtft.h" |
| 44 | |
| 45 | extern void fbtft_sysfs_init(struct fbtft_par *par); |
| 46 | extern void fbtft_sysfs_exit(struct fbtft_par *par); |
| 47 | extern void fbtft_expand_debug_value(unsigned long *debug); |
| 48 | extern int fbtft_gamma_parse_str(struct fbtft_par *par, unsigned long *curves, |
| 49 | const char *str, int size); |
| 50 | |
| 51 | static unsigned long debug; |
Aya Mahfouz | 7e059db | 2015-02-19 04:56:50 +0200 | [diff] [blame] | 52 | module_param(debug, ulong, 0); |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 53 | MODULE_PARM_DESC(debug, "override device debug level"); |
| 54 | |
| 55 | static bool dma = true; |
| 56 | module_param(dma, bool, 0); |
| 57 | MODULE_PARM_DESC(dma, "Use DMA buffer"); |
| 58 | |
| 59 | |
| 60 | void fbtft_dbg_hex(const struct device *dev, int groupsize, |
| 61 | void *buf, size_t len, const char *fmt, ...) |
| 62 | { |
| 63 | va_list args; |
| 64 | static char textbuf[512]; |
| 65 | char *text = textbuf; |
| 66 | size_t text_len; |
| 67 | |
| 68 | va_start(args, fmt); |
| 69 | text_len = vscnprintf(text, sizeof(textbuf), fmt, args); |
| 70 | va_end(args); |
| 71 | |
| 72 | hex_dump_to_buffer(buf, len, 32, groupsize, text + text_len, |
| 73 | 512 - text_len, false); |
| 74 | |
| 75 | if (len > 32) |
| 76 | dev_info(dev, "%s ...\n", text); |
| 77 | else |
| 78 | dev_info(dev, "%s\n", text); |
| 79 | } |
| 80 | EXPORT_SYMBOL(fbtft_dbg_hex); |
| 81 | |
Krzysztof Adamski | ed20843 | 2015-01-22 19:08:58 +0100 | [diff] [blame] | 82 | static unsigned long fbtft_request_gpios_match(struct fbtft_par *par, |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 83 | const struct fbtft_gpio *gpio) |
| 84 | { |
| 85 | int ret; |
| 86 | long val; |
| 87 | |
| 88 | fbtft_par_dbg(DEBUG_REQUEST_GPIOS_MATCH, par, "%s('%s')\n", |
| 89 | __func__, gpio->name); |
| 90 | |
| 91 | if (strcasecmp(gpio->name, "reset") == 0) { |
| 92 | par->gpio.reset = gpio->gpio; |
| 93 | return GPIOF_OUT_INIT_HIGH; |
| 94 | } else if (strcasecmp(gpio->name, "dc") == 0) { |
| 95 | par->gpio.dc = gpio->gpio; |
| 96 | return GPIOF_OUT_INIT_LOW; |
| 97 | } else if (strcasecmp(gpio->name, "cs") == 0) { |
| 98 | par->gpio.cs = gpio->gpio; |
| 99 | return GPIOF_OUT_INIT_HIGH; |
| 100 | } else if (strcasecmp(gpio->name, "wr") == 0) { |
| 101 | par->gpio.wr = gpio->gpio; |
| 102 | return GPIOF_OUT_INIT_HIGH; |
| 103 | } else if (strcasecmp(gpio->name, "rd") == 0) { |
| 104 | par->gpio.rd = gpio->gpio; |
| 105 | return GPIOF_OUT_INIT_HIGH; |
| 106 | } else if (strcasecmp(gpio->name, "latch") == 0) { |
| 107 | par->gpio.latch = gpio->gpio; |
| 108 | return GPIOF_OUT_INIT_LOW; |
| 109 | } else if (gpio->name[0] == 'd' && gpio->name[1] == 'b') { |
| 110 | ret = kstrtol(&gpio->name[2], 10, &val); |
| 111 | if (ret == 0 && val < 16) { |
| 112 | par->gpio.db[val] = gpio->gpio; |
| 113 | return GPIOF_OUT_INIT_LOW; |
| 114 | } |
| 115 | } else if (strcasecmp(gpio->name, "led") == 0) { |
| 116 | par->gpio.led[0] = gpio->gpio; |
| 117 | return GPIOF_OUT_INIT_LOW; |
| 118 | } else if (strcasecmp(gpio->name, "led_") == 0) { |
| 119 | par->gpio.led[0] = gpio->gpio; |
| 120 | return GPIOF_OUT_INIT_HIGH; |
| 121 | } |
| 122 | |
| 123 | return FBTFT_GPIO_NO_MATCH; |
| 124 | } |
| 125 | |
Krzysztof Adamski | ed20843 | 2015-01-22 19:08:58 +0100 | [diff] [blame] | 126 | static int fbtft_request_gpios(struct fbtft_par *par) |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 127 | { |
| 128 | struct fbtft_platform_data *pdata = par->pdata; |
| 129 | const struct fbtft_gpio *gpio; |
| 130 | unsigned long flags; |
| 131 | int ret; |
| 132 | |
| 133 | if (pdata && pdata->gpios) { |
| 134 | gpio = pdata->gpios; |
| 135 | while (gpio->name[0]) { |
| 136 | flags = FBTFT_GPIO_NO_MATCH; |
| 137 | /* if driver provides match function, try it first, |
| 138 | if no match use our own */ |
| 139 | if (par->fbtftops.request_gpios_match) |
| 140 | flags = par->fbtftops.request_gpios_match(par, gpio); |
| 141 | if (flags == FBTFT_GPIO_NO_MATCH) |
| 142 | flags = fbtft_request_gpios_match(par, gpio); |
| 143 | if (flags != FBTFT_GPIO_NO_MATCH) { |
| 144 | ret = devm_gpio_request_one(par->info->device, |
| 145 | gpio->gpio, flags, |
| 146 | par->info->device->driver->name); |
| 147 | if (ret < 0) { |
| 148 | dev_err(par->info->device, |
| 149 | "%s: gpio_request_one('%s'=%d) failed with %d\n", |
| 150 | __func__, gpio->name, |
| 151 | gpio->gpio, ret); |
| 152 | return ret; |
| 153 | } |
| 154 | fbtft_par_dbg(DEBUG_REQUEST_GPIOS, par, |
| 155 | "%s: '%s' = GPIO%d\n", |
| 156 | __func__, gpio->name, gpio->gpio); |
| 157 | } |
| 158 | gpio++; |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | return 0; |
| 163 | } |
| 164 | |
| 165 | #ifdef CONFIG_OF |
| 166 | static int fbtft_request_one_gpio(struct fbtft_par *par, |
| 167 | const char *name, int index, int *gpiop) |
| 168 | { |
| 169 | struct device *dev = par->info->device; |
| 170 | struct device_node *node = dev->of_node; |
| 171 | int gpio, flags, ret = 0; |
| 172 | enum of_gpio_flags of_flags; |
| 173 | |
| 174 | if (of_find_property(node, name, NULL)) { |
| 175 | gpio = of_get_named_gpio_flags(node, name, index, &of_flags); |
| 176 | if (gpio == -ENOENT) |
| 177 | return 0; |
| 178 | if (gpio == -EPROBE_DEFER) |
| 179 | return gpio; |
| 180 | if (gpio < 0) { |
| 181 | dev_err(dev, |
| 182 | "failed to get '%s' from DT\n", name); |
| 183 | return gpio; |
| 184 | } |
| 185 | |
| 186 | /* active low translates to initially low */ |
| 187 | flags = (of_flags & OF_GPIO_ACTIVE_LOW) ? GPIOF_OUT_INIT_LOW : |
| 188 | GPIOF_OUT_INIT_HIGH; |
| 189 | ret = devm_gpio_request_one(dev, gpio, flags, |
| 190 | dev->driver->name); |
| 191 | if (ret) { |
| 192 | dev_err(dev, |
| 193 | "gpio_request_one('%s'=%d) failed with %d\n", |
| 194 | name, gpio, ret); |
| 195 | return ret; |
| 196 | } |
| 197 | if (gpiop) |
| 198 | *gpiop = gpio; |
| 199 | fbtft_par_dbg(DEBUG_REQUEST_GPIOS, par, "%s: '%s' = GPIO%d\n", |
| 200 | __func__, name, gpio); |
| 201 | } |
| 202 | |
| 203 | return ret; |
| 204 | } |
| 205 | |
| 206 | static int fbtft_request_gpios_dt(struct fbtft_par *par) |
| 207 | { |
| 208 | int i; |
| 209 | int ret; |
| 210 | |
| 211 | if (!par->info->device->of_node) |
| 212 | return -EINVAL; |
| 213 | |
| 214 | ret = fbtft_request_one_gpio(par, "reset-gpios", 0, &par->gpio.reset); |
| 215 | if (ret) |
| 216 | return ret; |
| 217 | ret = fbtft_request_one_gpio(par, "dc-gpios", 0, &par->gpio.dc); |
| 218 | if (ret) |
| 219 | return ret; |
| 220 | ret = fbtft_request_one_gpio(par, "rd-gpios", 0, &par->gpio.rd); |
| 221 | if (ret) |
| 222 | return ret; |
| 223 | ret = fbtft_request_one_gpio(par, "wr-gpios", 0, &par->gpio.wr); |
| 224 | if (ret) |
| 225 | return ret; |
| 226 | ret = fbtft_request_one_gpio(par, "cs-gpios", 0, &par->gpio.cs); |
| 227 | if (ret) |
| 228 | return ret; |
| 229 | ret = fbtft_request_one_gpio(par, "latch-gpios", 0, &par->gpio.latch); |
| 230 | if (ret) |
| 231 | return ret; |
| 232 | for (i = 0; i < 16; i++) { |
| 233 | ret = fbtft_request_one_gpio(par, "db-gpios", i, |
| 234 | &par->gpio.db[i]); |
| 235 | if (ret) |
| 236 | return ret; |
| 237 | ret = fbtft_request_one_gpio(par, "led-gpios", i, |
| 238 | &par->gpio.led[i]); |
| 239 | if (ret) |
| 240 | return ret; |
| 241 | ret = fbtft_request_one_gpio(par, "aux-gpios", i, |
| 242 | &par->gpio.aux[i]); |
| 243 | if (ret) |
| 244 | return ret; |
| 245 | } |
| 246 | |
| 247 | return 0; |
| 248 | } |
| 249 | #endif |
| 250 | |
| 251 | #ifdef CONFIG_FB_BACKLIGHT |
Krzysztof Adamski | ed20843 | 2015-01-22 19:08:58 +0100 | [diff] [blame] | 252 | static int fbtft_backlight_update_status(struct backlight_device *bd) |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 253 | { |
| 254 | struct fbtft_par *par = bl_get_data(bd); |
| 255 | bool polarity = !!(bd->props.state & BL_CORE_DRIVER1); |
| 256 | |
| 257 | fbtft_par_dbg(DEBUG_BACKLIGHT, par, |
| 258 | "%s: polarity=%d, power=%d, fb_blank=%d\n", |
| 259 | __func__, polarity, bd->props.power, bd->props.fb_blank); |
| 260 | |
| 261 | if ((bd->props.power == FB_BLANK_UNBLANK) && (bd->props.fb_blank == FB_BLANK_UNBLANK)) |
| 262 | gpio_set_value(par->gpio.led[0], polarity); |
| 263 | else |
| 264 | gpio_set_value(par->gpio.led[0], !polarity); |
| 265 | |
| 266 | return 0; |
| 267 | } |
| 268 | |
Krzysztof Adamski | ed20843 | 2015-01-22 19:08:58 +0100 | [diff] [blame] | 269 | static int fbtft_backlight_get_brightness(struct backlight_device *bd) |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 270 | { |
| 271 | return bd->props.brightness; |
| 272 | } |
| 273 | |
| 274 | void fbtft_unregister_backlight(struct fbtft_par *par) |
| 275 | { |
| 276 | const struct backlight_ops *bl_ops; |
| 277 | |
| 278 | fbtft_par_dbg(DEBUG_BACKLIGHT, par, "%s()\n", __func__); |
| 279 | |
| 280 | if (par->info->bl_dev) { |
| 281 | par->info->bl_dev->props.power = FB_BLANK_POWERDOWN; |
| 282 | backlight_update_status(par->info->bl_dev); |
| 283 | bl_ops = par->info->bl_dev->ops; |
| 284 | backlight_device_unregister(par->info->bl_dev); |
| 285 | par->info->bl_dev = NULL; |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | void fbtft_register_backlight(struct fbtft_par *par) |
| 290 | { |
| 291 | struct backlight_device *bd; |
| 292 | struct backlight_properties bl_props = { 0, }; |
| 293 | struct backlight_ops *bl_ops; |
| 294 | |
| 295 | fbtft_par_dbg(DEBUG_BACKLIGHT, par, "%s()\n", __func__); |
| 296 | |
| 297 | if (par->gpio.led[0] == -1) { |
| 298 | fbtft_par_dbg(DEBUG_BACKLIGHT, par, |
| 299 | "%s(): led pin not set, exiting.\n", __func__); |
| 300 | return; |
| 301 | } |
| 302 | |
| 303 | bl_ops = devm_kzalloc(par->info->device, sizeof(struct backlight_ops), |
| 304 | GFP_KERNEL); |
Dilek Uzulmez | 6cb624e | 2015-03-02 22:56:53 +0200 | [diff] [blame^] | 305 | if (!bl_ops) |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 306 | return; |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 307 | |
| 308 | bl_ops->get_brightness = fbtft_backlight_get_brightness; |
| 309 | bl_ops->update_status = fbtft_backlight_update_status; |
| 310 | bl_props.type = BACKLIGHT_RAW; |
| 311 | /* Assume backlight is off, get polarity from current state of pin */ |
| 312 | bl_props.power = FB_BLANK_POWERDOWN; |
| 313 | if (!gpio_get_value(par->gpio.led[0])) |
| 314 | bl_props.state |= BL_CORE_DRIVER1; |
| 315 | |
| 316 | bd = backlight_device_register(dev_driver_string(par->info->device), |
| 317 | par->info->device, par, bl_ops, &bl_props); |
| 318 | if (IS_ERR(bd)) { |
| 319 | dev_err(par->info->device, |
| 320 | "cannot register backlight device (%ld)\n", |
| 321 | PTR_ERR(bd)); |
| 322 | return; |
| 323 | } |
| 324 | par->info->bl_dev = bd; |
| 325 | |
| 326 | if (!par->fbtftops.unregister_backlight) |
| 327 | par->fbtftops.unregister_backlight = fbtft_unregister_backlight; |
| 328 | } |
| 329 | #else |
| 330 | void fbtft_register_backlight(struct fbtft_par *par) { }; |
| 331 | void fbtft_unregister_backlight(struct fbtft_par *par) { }; |
| 332 | #endif |
| 333 | EXPORT_SYMBOL(fbtft_register_backlight); |
| 334 | EXPORT_SYMBOL(fbtft_unregister_backlight); |
| 335 | |
Krzysztof Adamski | ed20843 | 2015-01-22 19:08:58 +0100 | [diff] [blame] | 336 | static void fbtft_set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, |
| 337 | int ye) |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 338 | { |
| 339 | fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par, |
| 340 | "%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye); |
| 341 | |
| 342 | /* Column address set */ |
| 343 | write_reg(par, 0x2A, |
| 344 | (xs >> 8) & 0xFF, xs & 0xFF, (xe >> 8) & 0xFF, xe & 0xFF); |
| 345 | |
| 346 | /* Row adress set */ |
| 347 | write_reg(par, 0x2B, |
| 348 | (ys >> 8) & 0xFF, ys & 0xFF, (ye >> 8) & 0xFF, ye & 0xFF); |
| 349 | |
| 350 | /* Memory write */ |
| 351 | write_reg(par, 0x2C); |
| 352 | } |
| 353 | |
| 354 | |
Krzysztof Adamski | ed20843 | 2015-01-22 19:08:58 +0100 | [diff] [blame] | 355 | static void fbtft_reset(struct fbtft_par *par) |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 356 | { |
| 357 | if (par->gpio.reset == -1) |
| 358 | return; |
| 359 | fbtft_par_dbg(DEBUG_RESET, par, "%s()\n", __func__); |
| 360 | gpio_set_value(par->gpio.reset, 0); |
| 361 | udelay(20); |
| 362 | gpio_set_value(par->gpio.reset, 1); |
| 363 | mdelay(120); |
| 364 | } |
| 365 | |
| 366 | |
Krzysztof Adamski | ed20843 | 2015-01-22 19:08:58 +0100 | [diff] [blame] | 367 | static void fbtft_update_display(struct fbtft_par *par, unsigned start_line, |
| 368 | unsigned end_line) |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 369 | { |
| 370 | size_t offset, len; |
| 371 | struct timespec ts_start, ts_end, ts_fps, ts_duration; |
| 372 | long fps_ms, fps_us, duration_ms, duration_us; |
| 373 | long fps, throughput; |
| 374 | bool timeit = false; |
| 375 | int ret = 0; |
| 376 | |
| 377 | if (unlikely(par->debug & (DEBUG_TIME_FIRST_UPDATE | DEBUG_TIME_EACH_UPDATE))) { |
Yeliz Taneroglu | 6ba67a5 | 2015-03-02 17:49:59 +0200 | [diff] [blame] | 378 | if ((par->debug & DEBUG_TIME_EACH_UPDATE) || |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 379 | ((par->debug & DEBUG_TIME_FIRST_UPDATE) && !par->first_update_done)) { |
| 380 | getnstimeofday(&ts_start); |
| 381 | timeit = true; |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | /* Sanity checks */ |
| 386 | if (start_line > end_line) { |
| 387 | dev_warn(par->info->device, |
| 388 | "%s: start_line=%u is larger than end_line=%u. Shouldn't happen, will do full display update\n", |
| 389 | __func__, start_line, end_line); |
| 390 | start_line = 0; |
| 391 | end_line = par->info->var.yres - 1; |
| 392 | } |
| 393 | if (start_line > par->info->var.yres - 1 || end_line > par->info->var.yres - 1) { |
| 394 | dev_warn(par->info->device, |
| 395 | "%s: start_line=%u or end_line=%u is larger than max=%d. Shouldn't happen, will do full display update\n", |
| 396 | __func__, start_line, end_line, par->info->var.yres - 1); |
| 397 | start_line = 0; |
| 398 | end_line = par->info->var.yres - 1; |
| 399 | } |
| 400 | |
| 401 | fbtft_par_dbg(DEBUG_UPDATE_DISPLAY, par, "%s(start_line=%u, end_line=%u)\n", |
| 402 | __func__, start_line, end_line); |
| 403 | |
| 404 | if (par->fbtftops.set_addr_win) |
| 405 | par->fbtftops.set_addr_win(par, 0, start_line, |
| 406 | par->info->var.xres-1, end_line); |
| 407 | |
| 408 | offset = start_line * par->info->fix.line_length; |
| 409 | len = (end_line - start_line + 1) * par->info->fix.line_length; |
| 410 | ret = par->fbtftops.write_vmem(par, offset, len); |
| 411 | if (ret < 0) |
| 412 | dev_err(par->info->device, |
| 413 | "%s: write_vmem failed to update display buffer\n", |
| 414 | __func__); |
| 415 | |
| 416 | if (unlikely(timeit)) { |
| 417 | getnstimeofday(&ts_end); |
| 418 | if (par->update_time.tv_nsec == 0 && par->update_time.tv_sec == 0) { |
| 419 | par->update_time.tv_sec = ts_start.tv_sec; |
| 420 | par->update_time.tv_nsec = ts_start.tv_nsec; |
| 421 | } |
| 422 | ts_fps = timespec_sub(ts_start, par->update_time); |
| 423 | par->update_time.tv_sec = ts_start.tv_sec; |
| 424 | par->update_time.tv_nsec = ts_start.tv_nsec; |
| 425 | fps_ms = (ts_fps.tv_sec * 1000) + ((ts_fps.tv_nsec / 1000000) % 1000); |
| 426 | fps_us = (ts_fps.tv_nsec / 1000) % 1000; |
| 427 | fps = fps_ms * 1000 + fps_us; |
| 428 | fps = fps ? 1000000 / fps : 0; |
| 429 | |
| 430 | ts_duration = timespec_sub(ts_end, ts_start); |
| 431 | duration_ms = (ts_duration.tv_sec * 1000) + ((ts_duration.tv_nsec / 1000000) % 1000); |
| 432 | duration_us = (ts_duration.tv_nsec / 1000) % 1000; |
| 433 | throughput = duration_ms * 1000 + duration_us; |
| 434 | throughput = throughput ? (len * 1000) / throughput : 0; |
| 435 | throughput = throughput * 1000 / 1024; |
| 436 | |
| 437 | dev_info(par->info->device, |
| 438 | "Display update: %ld kB/s (%ld.%.3ld ms), fps=%ld (%ld.%.3ld ms)\n", |
| 439 | throughput, duration_ms, duration_us, |
| 440 | fps, fps_ms, fps_us); |
| 441 | par->first_update_done = true; |
| 442 | } |
| 443 | } |
| 444 | |
| 445 | |
Krzysztof Adamski | ed20843 | 2015-01-22 19:08:58 +0100 | [diff] [blame] | 446 | static void fbtft_mkdirty(struct fb_info *info, int y, int height) |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 447 | { |
| 448 | struct fbtft_par *par = info->par; |
| 449 | struct fb_deferred_io *fbdefio = info->fbdefio; |
| 450 | |
| 451 | /* special case, needed ? */ |
| 452 | if (y == -1) { |
| 453 | y = 0; |
| 454 | height = info->var.yres - 1; |
| 455 | } |
| 456 | |
| 457 | /* Mark display lines/area as dirty */ |
| 458 | spin_lock(&par->dirty_lock); |
| 459 | if (y < par->dirty_lines_start) |
| 460 | par->dirty_lines_start = y; |
| 461 | if (y + height - 1 > par->dirty_lines_end) |
| 462 | par->dirty_lines_end = y + height - 1; |
| 463 | spin_unlock(&par->dirty_lock); |
| 464 | |
| 465 | /* Schedule deferred_io to update display (no-op if already on queue)*/ |
| 466 | schedule_delayed_work(&info->deferred_work, fbdefio->delay); |
| 467 | } |
| 468 | |
Krzysztof Adamski | ed20843 | 2015-01-22 19:08:58 +0100 | [diff] [blame] | 469 | static void fbtft_deferred_io(struct fb_info *info, struct list_head *pagelist) |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 470 | { |
| 471 | struct fbtft_par *par = info->par; |
| 472 | unsigned dirty_lines_start, dirty_lines_end; |
| 473 | struct page *page; |
| 474 | unsigned long index; |
| 475 | unsigned y_low = 0, y_high = 0; |
| 476 | int count = 0; |
| 477 | |
| 478 | spin_lock(&par->dirty_lock); |
| 479 | dirty_lines_start = par->dirty_lines_start; |
| 480 | dirty_lines_end = par->dirty_lines_end; |
| 481 | /* set display line markers as clean */ |
| 482 | par->dirty_lines_start = par->info->var.yres - 1; |
| 483 | par->dirty_lines_end = 0; |
| 484 | spin_unlock(&par->dirty_lock); |
| 485 | |
| 486 | /* Mark display lines as dirty */ |
| 487 | list_for_each_entry(page, pagelist, lru) { |
| 488 | count++; |
| 489 | index = page->index << PAGE_SHIFT; |
| 490 | y_low = index / info->fix.line_length; |
| 491 | y_high = (index + PAGE_SIZE - 1) / info->fix.line_length; |
| 492 | fbtft_dev_dbg(DEBUG_DEFERRED_IO, par, info->device, |
| 493 | "page->index=%lu y_low=%d y_high=%d\n", |
| 494 | page->index, y_low, y_high); |
| 495 | if (y_high > info->var.yres - 1) |
| 496 | y_high = info->var.yres - 1; |
| 497 | if (y_low < dirty_lines_start) |
| 498 | dirty_lines_start = y_low; |
| 499 | if (y_high > dirty_lines_end) |
| 500 | dirty_lines_end = y_high; |
| 501 | } |
| 502 | |
| 503 | par->fbtftops.update_display(info->par, |
| 504 | dirty_lines_start, dirty_lines_end); |
| 505 | } |
| 506 | |
| 507 | |
Krzysztof Adamski | ed20843 | 2015-01-22 19:08:58 +0100 | [diff] [blame] | 508 | static void fbtft_fb_fillrect(struct fb_info *info, |
| 509 | const struct fb_fillrect *rect) |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 510 | { |
| 511 | struct fbtft_par *par = info->par; |
| 512 | |
| 513 | fbtft_dev_dbg(DEBUG_FB_FILLRECT, par, info->dev, |
| 514 | "%s: dx=%d, dy=%d, width=%d, height=%d\n", |
| 515 | __func__, rect->dx, rect->dy, rect->width, rect->height); |
| 516 | sys_fillrect(info, rect); |
| 517 | |
| 518 | par->fbtftops.mkdirty(info, rect->dy, rect->height); |
| 519 | } |
| 520 | |
Krzysztof Adamski | ed20843 | 2015-01-22 19:08:58 +0100 | [diff] [blame] | 521 | static void fbtft_fb_copyarea(struct fb_info *info, |
| 522 | const struct fb_copyarea *area) |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 523 | { |
| 524 | struct fbtft_par *par = info->par; |
| 525 | |
| 526 | fbtft_dev_dbg(DEBUG_FB_COPYAREA, par, info->dev, |
| 527 | "%s: dx=%d, dy=%d, width=%d, height=%d\n", |
| 528 | __func__, area->dx, area->dy, area->width, area->height); |
| 529 | sys_copyarea(info, area); |
| 530 | |
| 531 | par->fbtftops.mkdirty(info, area->dy, area->height); |
| 532 | } |
| 533 | |
Krzysztof Adamski | ed20843 | 2015-01-22 19:08:58 +0100 | [diff] [blame] | 534 | static void fbtft_fb_imageblit(struct fb_info *info, |
| 535 | const struct fb_image *image) |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 536 | { |
| 537 | struct fbtft_par *par = info->par; |
| 538 | |
| 539 | fbtft_dev_dbg(DEBUG_FB_IMAGEBLIT, par, info->dev, |
| 540 | "%s: dx=%d, dy=%d, width=%d, height=%d\n", |
| 541 | __func__, image->dx, image->dy, image->width, image->height); |
| 542 | sys_imageblit(info, image); |
| 543 | |
| 544 | par->fbtftops.mkdirty(info, image->dy, image->height); |
| 545 | } |
| 546 | |
Krzysztof Adamski | ed20843 | 2015-01-22 19:08:58 +0100 | [diff] [blame] | 547 | static ssize_t fbtft_fb_write(struct fb_info *info, const char __user *buf, |
| 548 | size_t count, loff_t *ppos) |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 549 | { |
| 550 | struct fbtft_par *par = info->par; |
| 551 | ssize_t res; |
| 552 | |
| 553 | fbtft_dev_dbg(DEBUG_FB_WRITE, par, info->dev, |
| 554 | "%s: count=%zd, ppos=%llu\n", __func__, count, *ppos); |
| 555 | res = fb_sys_write(info, buf, count, ppos); |
| 556 | |
| 557 | /* TODO: only mark changed area |
| 558 | update all for now */ |
| 559 | par->fbtftops.mkdirty(info, -1, 0); |
| 560 | |
| 561 | return res; |
| 562 | } |
| 563 | |
| 564 | /* from pxafb.c */ |
Krzysztof Adamski | ed20843 | 2015-01-22 19:08:58 +0100 | [diff] [blame] | 565 | static unsigned int chan_to_field(unsigned chan, struct fb_bitfield *bf) |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 566 | { |
| 567 | chan &= 0xffff; |
| 568 | chan >>= 16 - bf->length; |
| 569 | return chan << bf->offset; |
| 570 | } |
| 571 | |
Krzysztof Adamski | ed20843 | 2015-01-22 19:08:58 +0100 | [diff] [blame] | 572 | static int fbtft_fb_setcolreg(unsigned regno, unsigned red, unsigned green, |
| 573 | unsigned blue, unsigned transp, |
| 574 | struct fb_info *info) |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 575 | { |
| 576 | struct fbtft_par *par = info->par; |
| 577 | unsigned val; |
| 578 | int ret = 1; |
| 579 | |
| 580 | fbtft_dev_dbg(DEBUG_FB_SETCOLREG, par, info->dev, |
| 581 | "%s(regno=%u, red=0x%X, green=0x%X, blue=0x%X, trans=0x%X)\n", |
| 582 | __func__, regno, red, green, blue, transp); |
| 583 | |
| 584 | switch (info->fix.visual) { |
| 585 | case FB_VISUAL_TRUECOLOR: |
| 586 | if (regno < 16) { |
| 587 | u32 *pal = info->pseudo_palette; |
| 588 | |
| 589 | val = chan_to_field(red, &info->var.red); |
| 590 | val |= chan_to_field(green, &info->var.green); |
| 591 | val |= chan_to_field(blue, &info->var.blue); |
| 592 | |
| 593 | pal[regno] = val; |
| 594 | ret = 0; |
| 595 | } |
| 596 | break; |
| 597 | |
| 598 | } |
| 599 | return ret; |
| 600 | } |
| 601 | |
Krzysztof Adamski | ed20843 | 2015-01-22 19:08:58 +0100 | [diff] [blame] | 602 | static int fbtft_fb_blank(int blank, struct fb_info *info) |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 603 | { |
| 604 | struct fbtft_par *par = info->par; |
| 605 | int ret = -EINVAL; |
| 606 | |
| 607 | fbtft_dev_dbg(DEBUG_FB_BLANK, par, info->dev, "%s(blank=%d)\n", |
| 608 | __func__, blank); |
| 609 | |
| 610 | if (!par->fbtftops.blank) |
| 611 | return ret; |
| 612 | |
| 613 | switch (blank) { |
| 614 | case FB_BLANK_POWERDOWN: |
| 615 | case FB_BLANK_VSYNC_SUSPEND: |
| 616 | case FB_BLANK_HSYNC_SUSPEND: |
| 617 | case FB_BLANK_NORMAL: |
| 618 | ret = par->fbtftops.blank(par, true); |
| 619 | break; |
| 620 | case FB_BLANK_UNBLANK: |
| 621 | ret = par->fbtftops.blank(par, false); |
| 622 | break; |
| 623 | } |
| 624 | return ret; |
| 625 | } |
| 626 | |
Krzysztof Adamski | ed20843 | 2015-01-22 19:08:58 +0100 | [diff] [blame] | 627 | static void fbtft_merge_fbtftops(struct fbtft_ops *dst, struct fbtft_ops *src) |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 628 | { |
| 629 | if (src->write) |
| 630 | dst->write = src->write; |
| 631 | if (src->read) |
| 632 | dst->read = src->read; |
| 633 | if (src->write_vmem) |
| 634 | dst->write_vmem = src->write_vmem; |
| 635 | if (src->write_register) |
| 636 | dst->write_register = src->write_register; |
| 637 | if (src->set_addr_win) |
| 638 | dst->set_addr_win = src->set_addr_win; |
| 639 | if (src->reset) |
| 640 | dst->reset = src->reset; |
| 641 | if (src->mkdirty) |
| 642 | dst->mkdirty = src->mkdirty; |
| 643 | if (src->update_display) |
| 644 | dst->update_display = src->update_display; |
| 645 | if (src->init_display) |
| 646 | dst->init_display = src->init_display; |
| 647 | if (src->blank) |
| 648 | dst->blank = src->blank; |
| 649 | if (src->request_gpios_match) |
| 650 | dst->request_gpios_match = src->request_gpios_match; |
| 651 | if (src->request_gpios) |
| 652 | dst->request_gpios = src->request_gpios; |
| 653 | if (src->verify_gpios) |
| 654 | dst->verify_gpios = src->verify_gpios; |
| 655 | if (src->register_backlight) |
| 656 | dst->register_backlight = src->register_backlight; |
| 657 | if (src->unregister_backlight) |
| 658 | dst->unregister_backlight = src->unregister_backlight; |
| 659 | if (src->set_var) |
| 660 | dst->set_var = src->set_var; |
| 661 | if (src->set_gamma) |
| 662 | dst->set_gamma = src->set_gamma; |
| 663 | } |
| 664 | |
| 665 | /** |
| 666 | * fbtft_framebuffer_alloc - creates a new frame buffer info structure |
| 667 | * |
| 668 | * @display: pointer to structure describing the display |
| 669 | * @dev: pointer to the device for this fb, this can be NULL |
| 670 | * |
| 671 | * Creates a new frame buffer info structure. |
| 672 | * |
| 673 | * Also creates and populates the following structures: |
| 674 | * info->fbops |
| 675 | * info->fbdefio |
| 676 | * info->pseudo_palette |
| 677 | * par->fbtftops |
| 678 | * par->txbuf |
| 679 | * |
| 680 | * Returns the new structure, or NULL if an error occurred. |
| 681 | * |
| 682 | */ |
| 683 | struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display, |
| 684 | struct device *dev) |
| 685 | { |
| 686 | struct fb_info *info; |
| 687 | struct fbtft_par *par; |
| 688 | struct fb_ops *fbops = NULL; |
| 689 | struct fb_deferred_io *fbdefio = NULL; |
| 690 | struct fbtft_platform_data *pdata = dev->platform_data; |
| 691 | u8 *vmem = NULL; |
| 692 | void *txbuf = NULL; |
| 693 | void *buf = NULL; |
| 694 | unsigned width; |
| 695 | unsigned height; |
| 696 | int txbuflen = display->txbuflen; |
| 697 | unsigned bpp = display->bpp; |
| 698 | unsigned fps = display->fps; |
| 699 | int vmem_size, i; |
| 700 | int *init_sequence = display->init_sequence; |
| 701 | char *gamma = display->gamma; |
| 702 | unsigned long *gamma_curves = NULL; |
| 703 | |
| 704 | /* sanity check */ |
| 705 | if (display->gamma_num * display->gamma_len > FBTFT_GAMMA_MAX_VALUES_TOTAL) { |
| 706 | dev_err(dev, |
| 707 | "%s: FBTFT_GAMMA_MAX_VALUES_TOTAL=%d is exceeded\n", |
| 708 | __func__, FBTFT_GAMMA_MAX_VALUES_TOTAL); |
| 709 | return NULL; |
| 710 | } |
| 711 | |
| 712 | /* defaults */ |
| 713 | if (!fps) |
| 714 | fps = 20; |
| 715 | if (!bpp) |
| 716 | bpp = 16; |
| 717 | |
| 718 | if (!pdata) { |
| 719 | dev_err(dev, "platform data is missing\n"); |
| 720 | return NULL; |
| 721 | } |
| 722 | |
| 723 | /* override driver values? */ |
| 724 | if (pdata->fps) |
| 725 | fps = pdata->fps; |
| 726 | if (pdata->txbuflen) |
| 727 | txbuflen = pdata->txbuflen; |
| 728 | if (pdata->display.init_sequence) |
| 729 | init_sequence = pdata->display.init_sequence; |
| 730 | if (pdata->gamma) |
| 731 | gamma = pdata->gamma; |
| 732 | if (pdata->display.debug) |
| 733 | display->debug = pdata->display.debug; |
| 734 | if (pdata->display.backlight) |
| 735 | display->backlight = pdata->display.backlight; |
| 736 | if (pdata->display.width) |
| 737 | display->width = pdata->display.width; |
| 738 | if (pdata->display.height) |
| 739 | display->height = pdata->display.height; |
| 740 | if (pdata->display.buswidth) |
| 741 | display->buswidth = pdata->display.buswidth; |
| 742 | if (pdata->display.regwidth) |
| 743 | display->regwidth = pdata->display.regwidth; |
| 744 | |
| 745 | display->debug |= debug; |
| 746 | fbtft_expand_debug_value(&display->debug); |
| 747 | |
| 748 | switch (pdata->rotate) { |
| 749 | case 90: |
| 750 | case 270: |
| 751 | width = display->height; |
| 752 | height = display->width; |
| 753 | break; |
| 754 | default: |
| 755 | width = display->width; |
| 756 | height = display->height; |
| 757 | } |
| 758 | |
| 759 | vmem_size = display->width * display->height * bpp / 8; |
| 760 | vmem = vzalloc(vmem_size); |
| 761 | if (!vmem) |
| 762 | goto alloc_fail; |
| 763 | |
| 764 | fbops = devm_kzalloc(dev, sizeof(struct fb_ops), GFP_KERNEL); |
| 765 | if (!fbops) |
| 766 | goto alloc_fail; |
| 767 | |
| 768 | fbdefio = devm_kzalloc(dev, sizeof(struct fb_deferred_io), GFP_KERNEL); |
| 769 | if (!fbdefio) |
| 770 | goto alloc_fail; |
| 771 | |
| 772 | buf = devm_kzalloc(dev, 128, GFP_KERNEL); |
| 773 | if (!buf) |
| 774 | goto alloc_fail; |
| 775 | |
| 776 | if (display->gamma_num && display->gamma_len) { |
| 777 | gamma_curves = devm_kzalloc(dev, display->gamma_num * display->gamma_len * sizeof(gamma_curves[0]), |
| 778 | GFP_KERNEL); |
| 779 | if (!gamma_curves) |
| 780 | goto alloc_fail; |
| 781 | } |
| 782 | |
| 783 | info = framebuffer_alloc(sizeof(struct fbtft_par), dev); |
| 784 | if (!info) |
| 785 | goto alloc_fail; |
| 786 | |
| 787 | info->screen_base = (u8 __force __iomem *)vmem; |
| 788 | info->fbops = fbops; |
| 789 | info->fbdefio = fbdefio; |
| 790 | |
| 791 | fbops->owner = dev->driver->owner; |
| 792 | fbops->fb_read = fb_sys_read; |
| 793 | fbops->fb_write = fbtft_fb_write; |
| 794 | fbops->fb_fillrect = fbtft_fb_fillrect; |
| 795 | fbops->fb_copyarea = fbtft_fb_copyarea; |
| 796 | fbops->fb_imageblit = fbtft_fb_imageblit; |
| 797 | fbops->fb_setcolreg = fbtft_fb_setcolreg; |
| 798 | fbops->fb_blank = fbtft_fb_blank; |
| 799 | |
| 800 | fbdefio->delay = HZ/fps; |
| 801 | fbdefio->deferred_io = fbtft_deferred_io; |
| 802 | fb_deferred_io_init(info); |
| 803 | |
| 804 | strncpy(info->fix.id, dev->driver->name, 16); |
| 805 | info->fix.type = FB_TYPE_PACKED_PIXELS; |
| 806 | info->fix.visual = FB_VISUAL_TRUECOLOR; |
| 807 | info->fix.xpanstep = 0; |
| 808 | info->fix.ypanstep = 0; |
| 809 | info->fix.ywrapstep = 0; |
| 810 | info->fix.line_length = width*bpp/8; |
| 811 | info->fix.accel = FB_ACCEL_NONE; |
| 812 | info->fix.smem_len = vmem_size; |
| 813 | |
| 814 | info->var.rotate = pdata->rotate; |
| 815 | info->var.xres = width; |
| 816 | info->var.yres = height; |
| 817 | info->var.xres_virtual = info->var.xres; |
| 818 | info->var.yres_virtual = info->var.yres; |
| 819 | info->var.bits_per_pixel = bpp; |
| 820 | info->var.nonstd = 1; |
| 821 | |
| 822 | /* RGB565 */ |
| 823 | info->var.red.offset = 11; |
| 824 | info->var.red.length = 5; |
| 825 | info->var.green.offset = 5; |
| 826 | info->var.green.length = 6; |
| 827 | info->var.blue.offset = 0; |
| 828 | info->var.blue.length = 5; |
| 829 | info->var.transp.offset = 0; |
| 830 | info->var.transp.length = 0; |
| 831 | |
| 832 | info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB; |
| 833 | |
| 834 | par = info->par; |
| 835 | par->info = info; |
| 836 | par->pdata = dev->platform_data; |
| 837 | par->debug = display->debug; |
| 838 | par->buf = buf; |
| 839 | spin_lock_init(&par->dirty_lock); |
| 840 | par->bgr = pdata->bgr; |
| 841 | par->startbyte = pdata->startbyte; |
| 842 | par->init_sequence = init_sequence; |
| 843 | par->gamma.curves = gamma_curves; |
| 844 | par->gamma.num_curves = display->gamma_num; |
| 845 | par->gamma.num_values = display->gamma_len; |
| 846 | mutex_init(&par->gamma.lock); |
| 847 | info->pseudo_palette = par->pseudo_palette; |
| 848 | |
| 849 | if (par->gamma.curves && gamma) { |
| 850 | if (fbtft_gamma_parse_str(par, |
| 851 | par->gamma.curves, gamma, strlen(gamma))) |
| 852 | goto alloc_fail; |
| 853 | } |
| 854 | |
| 855 | /* Transmit buffer */ |
| 856 | if (txbuflen == -1) |
| 857 | txbuflen = vmem_size + 2; /* add in case startbyte is used */ |
| 858 | |
| 859 | #ifdef __LITTLE_ENDIAN |
| 860 | if ((!txbuflen) && (bpp > 8)) |
| 861 | txbuflen = PAGE_SIZE; /* need buffer for byteswapping */ |
| 862 | #endif |
| 863 | |
| 864 | if (txbuflen > 0) { |
| 865 | if (dma) { |
| 866 | dev->coherent_dma_mask = ~0; |
| 867 | txbuf = dmam_alloc_coherent(dev, txbuflen, &par->txbuf.dma, GFP_DMA); |
| 868 | } else { |
| 869 | txbuf = devm_kzalloc(par->info->device, txbuflen, GFP_KERNEL); |
| 870 | } |
| 871 | if (!txbuf) |
| 872 | goto alloc_fail; |
| 873 | par->txbuf.buf = txbuf; |
| 874 | par->txbuf.len = txbuflen; |
| 875 | } |
| 876 | |
| 877 | /* Initialize gpios to disabled */ |
| 878 | par->gpio.reset = -1; |
| 879 | par->gpio.dc = -1; |
| 880 | par->gpio.rd = -1; |
| 881 | par->gpio.wr = -1; |
| 882 | par->gpio.cs = -1; |
| 883 | par->gpio.latch = -1; |
| 884 | for (i = 0; i < 16; i++) { |
| 885 | par->gpio.db[i] = -1; |
| 886 | par->gpio.led[i] = -1; |
| 887 | par->gpio.aux[i] = -1; |
| 888 | } |
| 889 | |
| 890 | /* default fbtft operations */ |
| 891 | par->fbtftops.write = fbtft_write_spi; |
| 892 | par->fbtftops.read = fbtft_read_spi; |
| 893 | par->fbtftops.write_vmem = fbtft_write_vmem16_bus8; |
| 894 | par->fbtftops.write_register = fbtft_write_reg8_bus8; |
| 895 | par->fbtftops.set_addr_win = fbtft_set_addr_win; |
| 896 | par->fbtftops.reset = fbtft_reset; |
| 897 | par->fbtftops.mkdirty = fbtft_mkdirty; |
| 898 | par->fbtftops.update_display = fbtft_update_display; |
| 899 | par->fbtftops.request_gpios = fbtft_request_gpios; |
| 900 | if (display->backlight) |
| 901 | par->fbtftops.register_backlight = fbtft_register_backlight; |
| 902 | |
| 903 | /* use driver provided functions */ |
| 904 | fbtft_merge_fbtftops(&par->fbtftops, &display->fbtftops); |
| 905 | |
| 906 | return info; |
| 907 | |
| 908 | alloc_fail: |
| 909 | vfree(vmem); |
| 910 | |
| 911 | return NULL; |
| 912 | } |
| 913 | EXPORT_SYMBOL(fbtft_framebuffer_alloc); |
| 914 | |
| 915 | /** |
| 916 | * fbtft_framebuffer_release - frees up all memory used by the framebuffer |
| 917 | * |
| 918 | * @info: frame buffer info structure |
| 919 | * |
| 920 | */ |
| 921 | void fbtft_framebuffer_release(struct fb_info *info) |
| 922 | { |
| 923 | fb_deferred_io_cleanup(info); |
| 924 | vfree(info->screen_base); |
| 925 | framebuffer_release(info); |
| 926 | } |
| 927 | EXPORT_SYMBOL(fbtft_framebuffer_release); |
| 928 | |
| 929 | /** |
| 930 | * fbtft_register_framebuffer - registers a tft frame buffer device |
| 931 | * @fb_info: frame buffer info structure |
| 932 | * |
| 933 | * Sets SPI driverdata if needed |
| 934 | * Requests needed gpios. |
| 935 | * Initializes display |
| 936 | * Updates display. |
| 937 | * Registers a frame buffer device @fb_info. |
| 938 | * |
| 939 | * Returns negative errno on error, or zero for success. |
| 940 | * |
| 941 | */ |
| 942 | int fbtft_register_framebuffer(struct fb_info *fb_info) |
| 943 | { |
| 944 | int ret; |
| 945 | char text1[50] = ""; |
| 946 | char text2[50] = ""; |
| 947 | struct fbtft_par *par = fb_info->par; |
| 948 | struct spi_device *spi = par->spi; |
| 949 | |
| 950 | /* sanity checks */ |
| 951 | if (!par->fbtftops.init_display) { |
| 952 | dev_err(fb_info->device, "missing fbtftops.init_display()\n"); |
| 953 | return -EINVAL; |
| 954 | } |
| 955 | |
| 956 | if (spi) |
| 957 | spi_set_drvdata(spi, fb_info); |
| 958 | if (par->pdev) |
| 959 | platform_set_drvdata(par->pdev, fb_info); |
| 960 | |
| 961 | ret = par->fbtftops.request_gpios(par); |
| 962 | if (ret < 0) |
| 963 | goto reg_fail; |
| 964 | |
| 965 | if (par->fbtftops.verify_gpios) { |
| 966 | ret = par->fbtftops.verify_gpios(par); |
| 967 | if (ret < 0) |
| 968 | goto reg_fail; |
| 969 | } |
| 970 | |
| 971 | ret = par->fbtftops.init_display(par); |
| 972 | if (ret < 0) |
| 973 | goto reg_fail; |
| 974 | if (par->fbtftops.set_var) { |
| 975 | ret = par->fbtftops.set_var(par); |
| 976 | if (ret < 0) |
| 977 | goto reg_fail; |
| 978 | } |
| 979 | |
| 980 | /* update the entire display */ |
| 981 | par->fbtftops.update_display(par, 0, par->info->var.yres - 1); |
| 982 | |
| 983 | if (par->fbtftops.set_gamma && par->gamma.curves) { |
| 984 | ret = par->fbtftops.set_gamma(par, par->gamma.curves); |
| 985 | if (ret) |
| 986 | goto reg_fail; |
| 987 | } |
| 988 | |
| 989 | if (par->fbtftops.register_backlight) |
| 990 | par->fbtftops.register_backlight(par); |
| 991 | |
| 992 | ret = register_framebuffer(fb_info); |
| 993 | if (ret < 0) |
| 994 | goto reg_fail; |
| 995 | |
| 996 | fbtft_sysfs_init(par); |
| 997 | |
| 998 | if (par->txbuf.buf) |
Fabio Estevam | 3fed5ba | 2015-02-19 10:12:11 -0200 | [diff] [blame] | 999 | sprintf(text1, ", %zu KiB %sbuffer memory", |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 1000 | par->txbuf.len >> 10, par->txbuf.dma ? "DMA " : ""); |
| 1001 | if (spi) |
| 1002 | sprintf(text2, ", spi%d.%d at %d MHz", spi->master->bus_num, |
| 1003 | spi->chip_select, spi->max_speed_hz/1000000); |
| 1004 | dev_info(fb_info->dev, |
| 1005 | "%s frame buffer, %dx%d, %d KiB video memory%s, fps=%lu%s\n", |
| 1006 | fb_info->fix.id, fb_info->var.xres, fb_info->var.yres, |
| 1007 | fb_info->fix.smem_len >> 10, text1, |
| 1008 | HZ/fb_info->fbdefio->delay, text2); |
| 1009 | |
| 1010 | #ifdef CONFIG_FB_BACKLIGHT |
| 1011 | /* Turn on backlight if available */ |
| 1012 | if (fb_info->bl_dev) { |
| 1013 | fb_info->bl_dev->props.power = FB_BLANK_UNBLANK; |
| 1014 | fb_info->bl_dev->ops->update_status(fb_info->bl_dev); |
| 1015 | } |
| 1016 | #endif |
| 1017 | |
| 1018 | return 0; |
| 1019 | |
| 1020 | reg_fail: |
| 1021 | if (par->fbtftops.unregister_backlight) |
| 1022 | par->fbtftops.unregister_backlight(par); |
| 1023 | if (spi) |
| 1024 | spi_set_drvdata(spi, NULL); |
| 1025 | if (par->pdev) |
| 1026 | platform_set_drvdata(par->pdev, NULL); |
| 1027 | |
| 1028 | return ret; |
| 1029 | } |
| 1030 | EXPORT_SYMBOL(fbtft_register_framebuffer); |
| 1031 | |
| 1032 | /** |
| 1033 | * fbtft_unregister_framebuffer - releases a tft frame buffer device |
| 1034 | * @fb_info: frame buffer info structure |
| 1035 | * |
| 1036 | * Frees SPI driverdata if needed |
| 1037 | * Frees gpios. |
| 1038 | * Unregisters frame buffer device. |
| 1039 | * |
| 1040 | */ |
| 1041 | int fbtft_unregister_framebuffer(struct fb_info *fb_info) |
| 1042 | { |
| 1043 | struct fbtft_par *par = fb_info->par; |
| 1044 | struct spi_device *spi = par->spi; |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 1045 | |
| 1046 | if (spi) |
| 1047 | spi_set_drvdata(spi, NULL); |
| 1048 | if (par->pdev) |
| 1049 | platform_set_drvdata(par->pdev, NULL); |
| 1050 | if (par->fbtftops.unregister_backlight) |
| 1051 | par->fbtftops.unregister_backlight(par); |
| 1052 | fbtft_sysfs_exit(par); |
Aya Mahfouz | 11107ff | 2015-02-27 15:10:30 +0200 | [diff] [blame] | 1053 | return unregister_framebuffer(fb_info); |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 1054 | } |
| 1055 | EXPORT_SYMBOL(fbtft_unregister_framebuffer); |
| 1056 | |
| 1057 | #ifdef CONFIG_OF |
| 1058 | /** |
| 1059 | * fbtft_init_display_dt() - Device Tree init_display() function |
| 1060 | * @par: Driver data |
| 1061 | * |
| 1062 | * Return: 0 if successful, negative if error |
| 1063 | */ |
| 1064 | static int fbtft_init_display_dt(struct fbtft_par *par) |
| 1065 | { |
| 1066 | struct device_node *node = par->info->device->of_node; |
| 1067 | struct property *prop; |
| 1068 | const __be32 *p; |
| 1069 | u32 val; |
| 1070 | int buf[64], i, j; |
| 1071 | char msg[128]; |
| 1072 | char str[16]; |
| 1073 | |
| 1074 | fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__); |
| 1075 | |
| 1076 | if (!node) |
| 1077 | return -EINVAL; |
| 1078 | |
| 1079 | prop = of_find_property(node, "init", NULL); |
| 1080 | p = of_prop_next_u32(prop, NULL, &val); |
| 1081 | if (!p) |
| 1082 | return -EINVAL; |
| 1083 | while (p) { |
| 1084 | if (val & FBTFT_OF_INIT_CMD) { |
| 1085 | val &= 0xFFFF; |
| 1086 | i = 0; |
| 1087 | while (p && !(val & 0xFFFF0000)) { |
| 1088 | if (i > 63) { |
| 1089 | dev_err(par->info->device, |
| 1090 | "%s: Maximum register values exceeded\n", |
| 1091 | __func__); |
| 1092 | return -EINVAL; |
| 1093 | } |
| 1094 | buf[i++] = val; |
| 1095 | p = of_prop_next_u32(prop, p, &val); |
| 1096 | } |
| 1097 | /* make debug message */ |
| 1098 | msg[0] = '\0'; |
| 1099 | for (j = 0; j < i; j++) { |
| 1100 | snprintf(str, 128, " %02X", buf[j]); |
| 1101 | strcat(msg, str); |
| 1102 | } |
| 1103 | fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, |
| 1104 | "init: write_register:%s\n", msg); |
| 1105 | |
| 1106 | par->fbtftops.write_register(par, i, |
| 1107 | buf[0], buf[1], buf[2], buf[3], |
| 1108 | buf[4], buf[5], buf[6], buf[7], |
| 1109 | buf[8], buf[9], buf[10], buf[11], |
| 1110 | buf[12], buf[13], buf[14], buf[15], |
| 1111 | buf[16], buf[17], buf[18], buf[19], |
| 1112 | buf[20], buf[21], buf[22], buf[23], |
| 1113 | buf[24], buf[25], buf[26], buf[27], |
| 1114 | buf[28], buf[29], buf[30], buf[31], |
| 1115 | buf[32], buf[33], buf[34], buf[35], |
| 1116 | buf[36], buf[37], buf[38], buf[39], |
| 1117 | buf[40], buf[41], buf[42], buf[43], |
| 1118 | buf[44], buf[45], buf[46], buf[47], |
| 1119 | buf[48], buf[49], buf[50], buf[51], |
| 1120 | buf[52], buf[53], buf[54], buf[55], |
| 1121 | buf[56], buf[57], buf[58], buf[59], |
| 1122 | buf[60], buf[61], buf[62], buf[63]); |
| 1123 | } else if (val & FBTFT_OF_INIT_DELAY) { |
| 1124 | fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, |
| 1125 | "init: msleep(%u)\n", val & 0xFFFF); |
| 1126 | msleep(val & 0xFFFF); |
| 1127 | p = of_prop_next_u32(prop, p, &val); |
| 1128 | } else { |
| 1129 | dev_err(par->info->device, "illegal init value 0x%X\n", |
| 1130 | val); |
| 1131 | return -EINVAL; |
| 1132 | } |
| 1133 | } |
| 1134 | |
| 1135 | return 0; |
| 1136 | } |
| 1137 | #endif |
| 1138 | |
| 1139 | /** |
| 1140 | * fbtft_init_display() - Generic init_display() function |
| 1141 | * @par: Driver data |
| 1142 | * |
| 1143 | * Uses par->init_sequence to do the initialization |
| 1144 | * |
| 1145 | * Return: 0 if successful, negative if error |
| 1146 | */ |
| 1147 | int fbtft_init_display(struct fbtft_par *par) |
| 1148 | { |
| 1149 | int buf[64]; |
| 1150 | char msg[128]; |
| 1151 | char str[16]; |
| 1152 | int i = 0; |
| 1153 | int j; |
| 1154 | |
| 1155 | fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__); |
| 1156 | |
| 1157 | /* sanity check */ |
| 1158 | if (!par->init_sequence) { |
| 1159 | dev_err(par->info->device, |
| 1160 | "error: init_sequence is not set\n"); |
| 1161 | return -EINVAL; |
| 1162 | } |
| 1163 | |
| 1164 | /* make sure stop marker exists */ |
| 1165 | for (i = 0; i < FBTFT_MAX_INIT_SEQUENCE; i++) |
| 1166 | if (par->init_sequence[i] == -3) |
| 1167 | break; |
| 1168 | if (i == FBTFT_MAX_INIT_SEQUENCE) { |
| 1169 | dev_err(par->info->device, |
| 1170 | "missing stop marker at end of init sequence\n"); |
| 1171 | return -EINVAL; |
| 1172 | } |
| 1173 | |
| 1174 | par->fbtftops.reset(par); |
| 1175 | if (par->gpio.cs != -1) |
| 1176 | gpio_set_value(par->gpio.cs, 0); /* Activate chip */ |
| 1177 | |
| 1178 | i = 0; |
| 1179 | while (i < FBTFT_MAX_INIT_SEQUENCE) { |
| 1180 | if (par->init_sequence[i] == -3) { |
| 1181 | /* done */ |
| 1182 | return 0; |
| 1183 | } |
| 1184 | if (par->init_sequence[i] >= 0) { |
| 1185 | dev_err(par->info->device, |
| 1186 | "missing delimiter at position %d\n", i); |
| 1187 | return -EINVAL; |
| 1188 | } |
| 1189 | if (par->init_sequence[i+1] < 0) { |
| 1190 | dev_err(par->info->device, |
| 1191 | "missing value after delimiter %d at position %d\n", |
| 1192 | par->init_sequence[i], i); |
| 1193 | return -EINVAL; |
| 1194 | } |
| 1195 | switch (par->init_sequence[i]) { |
| 1196 | case -1: |
| 1197 | i++; |
| 1198 | /* make debug message */ |
| 1199 | strcpy(msg, ""); |
| 1200 | j = i + 1; |
| 1201 | while (par->init_sequence[j] >= 0) { |
| 1202 | sprintf(str, "0x%02X ", par->init_sequence[j]); |
| 1203 | strcat(msg, str); |
| 1204 | j++; |
| 1205 | } |
| 1206 | fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, |
| 1207 | "init: write(0x%02X) %s\n", |
| 1208 | par->init_sequence[i], msg); |
| 1209 | |
| 1210 | /* Write */ |
| 1211 | j = 0; |
| 1212 | while (par->init_sequence[i] >= 0) { |
| 1213 | if (j > 63) { |
| 1214 | dev_err(par->info->device, |
| 1215 | "%s: Maximum register values exceeded\n", |
| 1216 | __func__); |
| 1217 | return -EINVAL; |
| 1218 | } |
| 1219 | buf[j++] = par->init_sequence[i++]; |
| 1220 | } |
| 1221 | par->fbtftops.write_register(par, j, |
| 1222 | buf[0], buf[1], buf[2], buf[3], |
| 1223 | buf[4], buf[5], buf[6], buf[7], |
| 1224 | buf[8], buf[9], buf[10], buf[11], |
| 1225 | buf[12], buf[13], buf[14], buf[15], |
| 1226 | buf[16], buf[17], buf[18], buf[19], |
| 1227 | buf[20], buf[21], buf[22], buf[23], |
| 1228 | buf[24], buf[25], buf[26], buf[27], |
| 1229 | buf[28], buf[29], buf[30], buf[31], |
| 1230 | buf[32], buf[33], buf[34], buf[35], |
| 1231 | buf[36], buf[37], buf[38], buf[39], |
| 1232 | buf[40], buf[41], buf[42], buf[43], |
| 1233 | buf[44], buf[45], buf[46], buf[47], |
| 1234 | buf[48], buf[49], buf[50], buf[51], |
| 1235 | buf[52], buf[53], buf[54], buf[55], |
| 1236 | buf[56], buf[57], buf[58], buf[59], |
| 1237 | buf[60], buf[61], buf[62], buf[63]); |
| 1238 | break; |
| 1239 | case -2: |
| 1240 | i++; |
| 1241 | fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, |
| 1242 | "init: mdelay(%d)\n", par->init_sequence[i]); |
| 1243 | mdelay(par->init_sequence[i++]); |
| 1244 | break; |
| 1245 | default: |
| 1246 | dev_err(par->info->device, |
| 1247 | "unknown delimiter %d at position %d\n", |
| 1248 | par->init_sequence[i], i); |
| 1249 | return -EINVAL; |
| 1250 | } |
| 1251 | } |
| 1252 | |
| 1253 | dev_err(par->info->device, |
| 1254 | "%s: something is wrong. Shouldn't get here.\n", __func__); |
| 1255 | return -EINVAL; |
| 1256 | } |
| 1257 | EXPORT_SYMBOL(fbtft_init_display); |
| 1258 | |
| 1259 | /** |
| 1260 | * fbtft_verify_gpios() - Generic verify_gpios() function |
| 1261 | * @par: Driver data |
| 1262 | * |
| 1263 | * Uses @spi, @pdev and @buswidth to determine which GPIOs is needed |
| 1264 | * |
| 1265 | * Return: 0 if successful, negative if error |
| 1266 | */ |
Krzysztof Adamski | ed20843 | 2015-01-22 19:08:58 +0100 | [diff] [blame] | 1267 | static int fbtft_verify_gpios(struct fbtft_par *par) |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 1268 | { |
| 1269 | struct fbtft_platform_data *pdata; |
| 1270 | int i; |
| 1271 | |
| 1272 | fbtft_par_dbg(DEBUG_VERIFY_GPIOS, par, "%s()\n", __func__); |
| 1273 | |
| 1274 | pdata = par->info->device->platform_data; |
Yeliz Taneroglu | 6ba67a5 | 2015-03-02 17:49:59 +0200 | [diff] [blame] | 1275 | if (pdata->display.buswidth != 9 && par->startbyte == 0 && |
Thomas Petazzoni | c296d5f | 2014-12-31 10:11:09 +0100 | [diff] [blame] | 1276 | par->gpio.dc < 0) { |
| 1277 | dev_err(par->info->device, |
| 1278 | "Missing info about 'dc' gpio. Aborting.\n"); |
| 1279 | return -EINVAL; |
| 1280 | } |
| 1281 | |
| 1282 | if (!par->pdev) |
| 1283 | return 0; |
| 1284 | |
| 1285 | if (par->gpio.wr < 0) { |
| 1286 | dev_err(par->info->device, "Missing 'wr' gpio. Aborting.\n"); |
| 1287 | return -EINVAL; |
| 1288 | } |
| 1289 | for (i = 0; i < pdata->display.buswidth; i++) { |
| 1290 | if (par->gpio.db[i] < 0) { |
| 1291 | dev_err(par->info->device, |
| 1292 | "Missing 'db%02d' gpio. Aborting.\n", i); |
| 1293 | return -EINVAL; |
| 1294 | } |
| 1295 | } |
| 1296 | |
| 1297 | return 0; |
| 1298 | } |
| 1299 | |
| 1300 | #ifdef CONFIG_OF |
| 1301 | /* returns 0 if the property is not present */ |
| 1302 | static u32 fbtft_of_value(struct device_node *node, const char *propname) |
| 1303 | { |
| 1304 | int ret; |
| 1305 | u32 val = 0; |
| 1306 | |
| 1307 | ret = of_property_read_u32(node, propname, &val); |
| 1308 | if (ret == 0) |
| 1309 | pr_info("%s: %s = %u\n", __func__, propname, val); |
| 1310 | |
| 1311 | return val; |
| 1312 | } |
| 1313 | |
| 1314 | static struct fbtft_platform_data *fbtft_probe_dt(struct device *dev) |
| 1315 | { |
| 1316 | struct device_node *node = dev->of_node; |
| 1317 | struct fbtft_platform_data *pdata; |
| 1318 | |
| 1319 | if (!node) { |
| 1320 | dev_err(dev, "Missing platform data or DT\n"); |
| 1321 | return ERR_PTR(-EINVAL); |
| 1322 | } |
| 1323 | |
| 1324 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); |
| 1325 | if (!pdata) |
| 1326 | return ERR_PTR(-ENOMEM); |
| 1327 | |
| 1328 | pdata->display.width = fbtft_of_value(node, "width"); |
| 1329 | pdata->display.height = fbtft_of_value(node, "height"); |
| 1330 | pdata->display.regwidth = fbtft_of_value(node, "regwidth"); |
| 1331 | pdata->display.buswidth = fbtft_of_value(node, "buswidth"); |
| 1332 | pdata->display.backlight = fbtft_of_value(node, "backlight"); |
| 1333 | pdata->display.bpp = fbtft_of_value(node, "bpp"); |
| 1334 | pdata->display.debug = fbtft_of_value(node, "debug"); |
| 1335 | pdata->rotate = fbtft_of_value(node, "rotate"); |
| 1336 | pdata->bgr = of_property_read_bool(node, "bgr"); |
| 1337 | pdata->fps = fbtft_of_value(node, "fps"); |
| 1338 | pdata->txbuflen = fbtft_of_value(node, "txbuflen"); |
| 1339 | pdata->startbyte = fbtft_of_value(node, "startbyte"); |
| 1340 | of_property_read_string(node, "gamma", (const char **)&pdata->gamma); |
| 1341 | |
| 1342 | if (of_find_property(node, "led-gpios", NULL)) |
| 1343 | pdata->display.backlight = 1; |
| 1344 | if (of_find_property(node, "init", NULL)) |
| 1345 | pdata->display.fbtftops.init_display = fbtft_init_display_dt; |
| 1346 | pdata->display.fbtftops.request_gpios = fbtft_request_gpios_dt; |
| 1347 | |
| 1348 | return pdata; |
| 1349 | } |
| 1350 | #else |
| 1351 | static struct fbtft_platform_data *fbtft_probe_dt(struct device *dev) |
| 1352 | { |
| 1353 | dev_err(dev, "Missing platform data\n"); |
| 1354 | return ERR_PTR(-EINVAL); |
| 1355 | } |
| 1356 | #endif |
| 1357 | |
| 1358 | /** |
| 1359 | * fbtft_probe_common() - Generic device probe() helper function |
| 1360 | * @display: Display properties |
| 1361 | * @sdev: SPI device |
| 1362 | * @pdev: Platform device |
| 1363 | * |
| 1364 | * Allocates, initializes and registers a framebuffer |
| 1365 | * |
| 1366 | * Either @sdev or @pdev should be NULL |
| 1367 | * |
| 1368 | * Return: 0 if successful, negative if error |
| 1369 | */ |
| 1370 | int fbtft_probe_common(struct fbtft_display *display, |
| 1371 | struct spi_device *sdev, struct platform_device *pdev) |
| 1372 | { |
| 1373 | struct device *dev; |
| 1374 | struct fb_info *info; |
| 1375 | struct fbtft_par *par; |
| 1376 | struct fbtft_platform_data *pdata; |
| 1377 | int ret; |
| 1378 | |
| 1379 | if (sdev) |
| 1380 | dev = &sdev->dev; |
| 1381 | else |
| 1382 | dev = &pdev->dev; |
| 1383 | |
| 1384 | if (unlikely(display->debug & DEBUG_DRIVER_INIT_FUNCTIONS)) |
| 1385 | dev_info(dev, "%s()\n", __func__); |
| 1386 | |
| 1387 | pdata = dev->platform_data; |
| 1388 | if (!pdata) { |
| 1389 | pdata = fbtft_probe_dt(dev); |
| 1390 | if (IS_ERR(pdata)) |
| 1391 | return PTR_ERR(pdata); |
| 1392 | dev->platform_data = pdata; |
| 1393 | } |
| 1394 | |
| 1395 | info = fbtft_framebuffer_alloc(display, dev); |
| 1396 | if (!info) |
| 1397 | return -ENOMEM; |
| 1398 | |
| 1399 | par = info->par; |
| 1400 | par->spi = sdev; |
| 1401 | par->pdev = pdev; |
| 1402 | |
| 1403 | if (display->buswidth == 0) { |
| 1404 | dev_err(dev, "buswidth is not set\n"); |
| 1405 | return -EINVAL; |
| 1406 | } |
| 1407 | |
| 1408 | /* write register functions */ |
| 1409 | if (display->regwidth == 8 && display->buswidth == 8) { |
| 1410 | par->fbtftops.write_register = fbtft_write_reg8_bus8; |
| 1411 | } else |
| 1412 | if (display->regwidth == 8 && display->buswidth == 9 && par->spi) { |
| 1413 | par->fbtftops.write_register = fbtft_write_reg8_bus9; |
| 1414 | } else if (display->regwidth == 16 && display->buswidth == 8) { |
| 1415 | par->fbtftops.write_register = fbtft_write_reg16_bus8; |
| 1416 | } else if (display->regwidth == 16 && display->buswidth == 16) { |
| 1417 | par->fbtftops.write_register = fbtft_write_reg16_bus16; |
| 1418 | } else { |
| 1419 | dev_warn(dev, |
| 1420 | "no default functions for regwidth=%d and buswidth=%d\n", |
| 1421 | display->regwidth, display->buswidth); |
| 1422 | } |
| 1423 | |
| 1424 | /* write_vmem() functions */ |
| 1425 | if (display->buswidth == 8) |
| 1426 | par->fbtftops.write_vmem = fbtft_write_vmem16_bus8; |
| 1427 | else if (display->buswidth == 9) |
| 1428 | par->fbtftops.write_vmem = fbtft_write_vmem16_bus9; |
| 1429 | else if (display->buswidth == 16) |
| 1430 | par->fbtftops.write_vmem = fbtft_write_vmem16_bus16; |
| 1431 | |
| 1432 | /* GPIO write() functions */ |
| 1433 | if (par->pdev) { |
| 1434 | if (display->buswidth == 8) |
| 1435 | par->fbtftops.write = fbtft_write_gpio8_wr; |
| 1436 | else if (display->buswidth == 16) |
| 1437 | par->fbtftops.write = fbtft_write_gpio16_wr; |
| 1438 | } |
| 1439 | |
| 1440 | /* 9-bit SPI setup */ |
| 1441 | if (par->spi && display->buswidth == 9) { |
| 1442 | par->spi->bits_per_word = 9; |
| 1443 | ret = par->spi->master->setup(par->spi); |
| 1444 | if (ret) { |
| 1445 | dev_warn(&par->spi->dev, |
| 1446 | "9-bit SPI not available, emulating using 8-bit.\n"); |
| 1447 | par->spi->bits_per_word = 8; |
| 1448 | ret = par->spi->master->setup(par->spi); |
| 1449 | if (ret) |
| 1450 | goto out_release; |
| 1451 | /* allocate buffer with room for dc bits */ |
| 1452 | par->extra = devm_kzalloc(par->info->device, |
| 1453 | par->txbuf.len + (par->txbuf.len / 8) + 8, |
| 1454 | GFP_KERNEL); |
| 1455 | if (!par->extra) { |
| 1456 | ret = -ENOMEM; |
| 1457 | goto out_release; |
| 1458 | } |
| 1459 | par->fbtftops.write = fbtft_write_spi_emulate_9; |
| 1460 | } |
| 1461 | } |
| 1462 | |
| 1463 | if (!par->fbtftops.verify_gpios) |
| 1464 | par->fbtftops.verify_gpios = fbtft_verify_gpios; |
| 1465 | |
| 1466 | /* make sure we still use the driver provided functions */ |
| 1467 | fbtft_merge_fbtftops(&par->fbtftops, &display->fbtftops); |
| 1468 | |
| 1469 | /* use init_sequence if provided */ |
| 1470 | if (par->init_sequence) |
| 1471 | par->fbtftops.init_display = fbtft_init_display; |
| 1472 | |
| 1473 | /* use platform_data provided functions above all */ |
| 1474 | fbtft_merge_fbtftops(&par->fbtftops, &pdata->display.fbtftops); |
| 1475 | |
| 1476 | ret = fbtft_register_framebuffer(info); |
| 1477 | if (ret < 0) |
| 1478 | goto out_release; |
| 1479 | |
| 1480 | return 0; |
| 1481 | |
| 1482 | out_release: |
| 1483 | fbtft_framebuffer_release(info); |
| 1484 | |
| 1485 | return ret; |
| 1486 | } |
| 1487 | EXPORT_SYMBOL(fbtft_probe_common); |
| 1488 | |
| 1489 | /** |
| 1490 | * fbtft_remove_common() - Generic device remove() helper function |
| 1491 | * @dev: Device |
| 1492 | * @info: Framebuffer |
| 1493 | * |
| 1494 | * Unregisters and releases the framebuffer |
| 1495 | * |
| 1496 | * Return: 0 if successful, negative if error |
| 1497 | */ |
| 1498 | int fbtft_remove_common(struct device *dev, struct fb_info *info) |
| 1499 | { |
| 1500 | struct fbtft_par *par; |
| 1501 | |
| 1502 | if (!info) |
| 1503 | return -EINVAL; |
| 1504 | par = info->par; |
| 1505 | if (par) |
| 1506 | fbtft_par_dbg(DEBUG_DRIVER_INIT_FUNCTIONS, par, |
| 1507 | "%s()\n", __func__); |
| 1508 | fbtft_unregister_framebuffer(info); |
| 1509 | fbtft_framebuffer_release(info); |
| 1510 | |
| 1511 | return 0; |
| 1512 | } |
| 1513 | EXPORT_SYMBOL(fbtft_remove_common); |
| 1514 | |
| 1515 | MODULE_LICENSE("GPL"); |