drivers/staging/fbtft/fbtft.h

   1 /*
   2  * Copyright (C) 2013 Noralf Tronnes
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #ifndef __LINUX_FBTFT_H
  16 #define __LINUX_FBTFT_H
  17
  18 #include <linux/fb.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/spi/spi.h>
  21 #include <linux/platform_device.h>
  22
  23 #define FBTFT_NOP               0x00
  24 #define FBTFT_SWRESET   0x01
  25 #define FBTFT_RDDID             0x04
  26 #define FBTFT_RDDST             0x09
  27 #define FBTFT_CASET             0x2A
  28 #define FBTFT_RASET             0x2B
  29 #define FBTFT_RAMWR             0x2C
  30
  31 #define FBTFT_ONBOARD_BACKLIGHT 2
  32
  33 #define FBTFT_GPIO_NO_MATCH             0xFFFF
  34 #define FBTFT_GPIO_NAME_SIZE    32
  35 #define FBTFT_MAX_INIT_SEQUENCE      512
  36 #define FBTFT_GAMMA_MAX_VALUES_TOTAL 128
  37
  38 #define FBTFT_OF_INIT_CMD       BIT(24)
  39 #define FBTFT_OF_INIT_DELAY     BIT(25)
  40
  41 /**
  42  * struct fbtft_gpio - Structure that holds one pinname to gpio mapping
  43  * @name: pinname (reset, dc, etc.)
  44  * @gpio: GPIO number
  45  *
  46  */
  47 struct fbtft_gpio {
  48         char name[FBTFT_GPIO_NAME_SIZE];
  49         unsigned gpio;
  50 };
  51
  52 struct fbtft_par;
  53
  54 /**
  55  * struct fbtft_ops - FBTFT operations structure
  56  * @write: Writes to interface bus
  57  * @read: Reads from interface bus
  58  * @write_vmem: Writes video memory to display
  59  * @write_reg: Writes to controller register
  60  * @set_addr_win: Set the GRAM update window
  61  * @reset: Reset the LCD controller
  62  * @mkdirty: Marks display lines for update
  63  * @update_display: Updates the display
  64  * @init_display: Initializes the display
  65  * @blank: Blank the display (optional)
  66  * @request_gpios_match: Do pinname to gpio matching
  67  * @request_gpios: Request gpios from the kernel
  68  * @free_gpios: Free previously requested gpios
  69  * @verify_gpios: Verify that necessary gpios is present (optional)
  70  * @register_backlight: Used to register backlight device (optional)
  71  * @unregister_backlight: Unregister backlight device (optional)
  72  * @set_var: Configure LCD with values from variables like @rotate and @bgr
  73  *           (optional)
  74  * @set_gamma: Set Gamma curve (optional)
  75  *
  76  * Most of these operations have default functions assigned to them in
  77  *     fbtft_framebuffer_alloc()
  78  */
  79 struct fbtft_ops {
  80         int (*write)(struct fbtft_par *par, void *buf, size_t len);
  81         int (*read)(struct fbtft_par *par, void *buf, size_t len);
  82         int (*write_vmem)(struct fbtft_par *par, size_t offset, size_t len);
  83         void (*write_register)(struct fbtft_par *par, int len, ...);
  84
  85         void (*set_addr_win)(struct fbtft_par *par,
  86                 int xs, int ys, int xe, int ye);
  87         void (*reset)(struct fbtft_par *par);
  88         void (*mkdirty)(struct fb_info *info, int from, int to);
  89         void (*update_display)(struct fbtft_par *par,
  90                                 unsigned start_line, unsigned end_line);
  91         int (*init_display)(struct fbtft_par *par);
  92         int (*blank)(struct fbtft_par *par, bool on);
  93
  94         unsigned long (*request_gpios_match)(struct fbtft_par *par,
  95                 const struct fbtft_gpio *gpio);
  96         int (*request_gpios)(struct fbtft_par *par);
  97         int (*verify_gpios)(struct fbtft_par *par);
  98
  99         void (*register_backlight)(struct fbtft_par *par);
 100         void (*unregister_backlight)(struct fbtft_par *par);
 101
 102         int (*set_var)(struct fbtft_par *par);
 103         int (*set_gamma)(struct fbtft_par *par, unsigned long *curves);
 104 };
 105
 106 /**
 107  * struct fbtft_display - Describes the display properties
 108  * @width: Width of display in pixels
 109  * @height: Height of display in pixels
 110  * @regwidth: LCD Controller Register width in bits
 111  * @buswidth: Display interface bus width in bits
 112  * @backlight: Backlight type.
 113  * @fbtftops: FBTFT operations provided by driver or device (platform_data)
 114  * @bpp: Bits per pixel
 115  * @fps: Frames per second
 116  * @txbuflen: Size of transmit buffer
 117  * @init_sequence: Pointer to LCD initialization array
 118  * @gamma: String representation of Gamma curve(s)
 119  * @gamma_num: Number of Gamma curves
 120  * @gamma_len: Number of values per Gamma curve
 121  * @debug: Initial debug value
 122  *
 123  * This structure is not stored by FBTFT except for init_sequence.
 124  */
 125 struct fbtft_display {
 126         unsigned width;
 127         unsigned height;
 128         unsigned regwidth;
 129         unsigned buswidth;
 130         unsigned backlight;
 131         struct fbtft_ops fbtftops;
 132         unsigned bpp;
 133         unsigned fps;
 134         int txbuflen;
 135         int *init_sequence;
 136         char *gamma;
 137         int gamma_num;
 138         int gamma_len;
 139         unsigned long debug;
 140 };
 141
 142 /**
 143  * struct fbtft_platform_data - Passes display specific data to the driver
 144  * @display: Display properties
 145  * @gpios: Pointer to an array of pinname to gpio mappings
 146  * @rotate: Display rotation angle
 147  * @bgr: LCD Controller BGR bit
 148  * @fps: Frames per second (this will go away, use @fps in @fbtft_display)
 149  * @txbuflen: Size of transmit buffer
 150  * @startbyte: When set, enables use of Startbyte in transfers
 151  * @gamma: String representation of Gamma curve(s)
 152  * @extra: A way to pass extra info
 153  */
 154 struct fbtft_platform_data {
 155         struct fbtft_display display;
 156         const struct fbtft_gpio *gpios;
 157         unsigned rotate;
 158         bool bgr;
 159         unsigned fps;
 160         int txbuflen;
 161         u8 startbyte;
 162         char *gamma;
 163         void *extra;
 164 };
 165
 166 /**
 167  * struct fbtft_par - Main FBTFT data structure
 168  *
 169  * This structure holds all relevant data to operate the display
 170  *
 171  * See sourcefile for documentation since nested structs is not
 172  * supported by kernel-doc.
 173  *
 174  */
 175 /* @spi: Set if it is a SPI device
 176  * @pdev: Set if it is a platform device
 177  * @info: Pointer to framebuffer fb_info structure
 178  * @pdata: Pointer to platform data
 179  * @ssbuf: Not used
 180  * @pseudo_palette: Used by fb_set_colreg()
 181  * @txbuf.buf: Transmit buffer
 182  * @txbuf.len: Transmit buffer length
 183  * @buf: Small buffer used when writing init data over SPI
 184  * @startbyte: Used by some controllers when in SPI mode.
 185  *             Format: 6 bit Device id + RS bit + RW bit
 186  * @fbtftops: FBTFT operations provided by driver or device (platform_data)
 187  * @dirty_lock: Protects dirty_lines_start and dirty_lines_end
 188  * @dirty_lines_start: Where to begin updating display
 189  * @dirty_lines_end: Where to end updating display
 190  * @gpio.reset: GPIO used to reset display
 191  * @gpio.dc: Data/Command signal, also known as RS
 192  * @gpio.rd: Read latching signal
 193  * @gpio.wr: Write latching signal
 194  * @gpio.latch: Bus latch signal, eg. 16->8 bit bus latch
 195  * @gpio.cs: LCD Chip Select with parallel interface bus
 196  * @gpio.db[16]: Parallel databus
 197  * @gpio.led[16]: Led control signals
 198  * @gpio.aux[16]: Auxiliary signals, not used by core
 199  * @init_sequence: Pointer to LCD initialization array
 200  * @gamma.lock: Mutex for Gamma curve locking
 201  * @gamma.curves: Pointer to Gamma curve array
 202  * @gamma.num_values: Number of values per Gamma curve
 203  * @gamma.num_curves: Number of Gamma curves
 204  * @debug: Pointer to debug value
 205  * @current_debug:
 206  * @first_update_done: Used to only time the first display update
 207  * @update_time: Used to calculate 'fps' in debug output
 208  * @bgr: BGR mode/\n
 209  * @extra: Extra info needed by driver
 210  */
 211 struct fbtft_par {
 212         struct spi_device *spi;
 213         struct platform_device *pdev;
 214         struct fb_info *info;
 215         struct fbtft_platform_data *pdata;
 216         u16 *ssbuf;
 217         u32 pseudo_palette[16];
 218         struct {
 219                 void *buf;
 220                 dma_addr_t dma;
 221                 size_t len;
 222         } txbuf;
 223         u8 *buf;
 224         u8 startbyte;
 225         struct fbtft_ops fbtftops;
 226         spinlock_t dirty_lock;
 227         unsigned dirty_lines_start;
 228         unsigned dirty_lines_end;
 229         struct {
 230                 int reset;
 231                 int dc;
 232                 int rd;
 233                 int wr;
 234                 int latch;
 235                 int cs;
 236                 int db[16];
 237                 int led[16];
 238                 int aux[16];
 239         } gpio;
 240         int *init_sequence;
 241         struct {
 242                 struct mutex lock;
 243                 unsigned long *curves;
 244                 int num_values;
 245                 int num_curves;
 246         } gamma;
 247         unsigned long debug;
 248         bool first_update_done;
 249         ktime_t update_time;
 250         bool bgr;
 251         void *extra;
 252 };
 253
 254 #define NUMARGS(...)  (sizeof((int[]){__VA_ARGS__})/sizeof(int))
 255
 256 #define write_reg(par, ...)                                              \
 257         par->fbtftops.write_register(par, NUMARGS(__VA_ARGS__), __VA_ARGS__)
 258
 259 /* fbtft-core.c */
 260 void fbtft_dbg_hex(const struct device *dev, int groupsize,
 261                    void *buf, size_t len, const char *fmt, ...);
 262 struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
 263                                         struct device *dev,
 264                                         struct fbtft_platform_data *pdata);
 265 void fbtft_framebuffer_release(struct fb_info *info);
 266 int fbtft_register_framebuffer(struct fb_info *fb_info);
 267 int fbtft_unregister_framebuffer(struct fb_info *fb_info);
 268 void fbtft_register_backlight(struct fbtft_par *par);
 269 void fbtft_unregister_backlight(struct fbtft_par *par);
 270 int fbtft_init_display(struct fbtft_par *par);
 271 int fbtft_probe_common(struct fbtft_display *display, struct spi_device *sdev,
 272                        struct platform_device *pdev);
 273 int fbtft_remove_common(struct device *dev, struct fb_info *info);
 274
 275 /* fbtft-io.c */
 276 int fbtft_write_spi(struct fbtft_par *par, void *buf, size_t len);
 277 int fbtft_write_spi_emulate_9(struct fbtft_par *par, void *buf, size_t len);
 278 int fbtft_read_spi(struct fbtft_par *par, void *buf, size_t len);
 279 int fbtft_write_gpio8_wr(struct fbtft_par *par, void *buf, size_t len);
 280 int fbtft_write_gpio16_wr(struct fbtft_par *par, void *buf, size_t len);
 281 int fbtft_write_gpio16_wr_latched(struct fbtft_par *par, void *buf, size_t len);
 282
 283 /* fbtft-bus.c */
 284 int fbtft_write_vmem8_bus8(struct fbtft_par *par, size_t offset, size_t len);
 285 int fbtft_write_vmem16_bus16(struct fbtft_par *par, size_t offset, size_t len);
 286 int fbtft_write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len);
 287 int fbtft_write_vmem16_bus9(struct fbtft_par *par, size_t offset, size_t len);
 288 void fbtft_write_reg8_bus8(struct fbtft_par *par, int len, ...);
 289 void fbtft_write_reg8_bus9(struct fbtft_par *par, int len, ...);
 290 void fbtft_write_reg16_bus8(struct fbtft_par *par, int len, ...);
 291 void fbtft_write_reg16_bus16(struct fbtft_par *par, int len, ...);
 292
 293 #define FBTFT_REGISTER_DRIVER(_name, _compatible, _display)                \
 294                                                                            \
 295 static int fbtft_driver_probe_spi(struct spi_device *spi)                  \
 296 {                                                                          \
 297         return fbtft_probe_common(_display, spi, NULL);                    \
 298 }                                                                          \
 299                                                                            \
 300 static int fbtft_driver_remove_spi(struct spi_device *spi)                 \
 301 {                                                                          \
 302         struct fb_info *info = spi_get_drvdata(spi);                       \
 303                                                                            \
 304         return fbtft_remove_common(&spi->dev, info);                       \
 305 }                                                                          \
 306                                                                            \
 307 static int fbtft_driver_probe_pdev(struct platform_device *pdev)           \
 308 {                                                                          \
 309         return fbtft_probe_common(_display, NULL, pdev);                   \
 310 }                                                                          \
 311                                                                            \
 312 static int fbtft_driver_remove_pdev(struct platform_device *pdev)          \
 313 {                                                                          \
 314         struct fb_info *info = platform_get_drvdata(pdev);                 \
 315                                                                            \
 316         return fbtft_remove_common(&pdev->dev, info);                      \
 317 }                                                                          \
 318                                                                            \
 319 static const struct of_device_id dt_ids[] = {                              \
 320         { .compatible = _compatible },                                     \
 321         {},                                                                \
 322 };                                                                         \
 323                                                                            \
 324 MODULE_DEVICE_TABLE(of, dt_ids);                                           \
 325                                                                            \
 326                                                                            \
 327 static struct spi_driver fbtft_driver_spi_driver = {                       \
 328         .driver = {                                                        \
 329                 .name   = _name,                                           \
 330                 .owner  = THIS_MODULE,                                     \
 331                 .of_match_table = of_match_ptr(dt_ids),                    \
 332         },                                                                 \
 333         .probe  = fbtft_driver_probe_spi,                                  \
 334         .remove = fbtft_driver_remove_spi,                                 \
 335 };                                                                         \
 336                                                                            \
 337 static struct platform_driver fbtft_driver_platform_driver = {             \
 338         .driver = {                                                        \
 339                 .name   = _name,                                           \
 340                 .owner  = THIS_MODULE,                                     \
 341                 .of_match_table = of_match_ptr(dt_ids),                    \
 342         },                                                                 \
 343         .probe  = fbtft_driver_probe_pdev,                                 \
 344         .remove = fbtft_driver_remove_pdev,                                \
 345 };                                                                         \
 346                                                                            \
 347 static int __init fbtft_driver_module_init(void)                           \
 348 {                                                                          \
 349         int ret;                                                           \
 350                                                                            \
 351         ret = spi_register_driver(&fbtft_driver_spi_driver);               \
 352         if (ret < 0)                                                       \
 353                 return ret;                                                \
 354         return platform_driver_register(&fbtft_driver_platform_driver);    \
 355 }                                                                          \
 356                                                                            \
 357 static void __exit fbtft_driver_module_exit(void)                          \
 358 {                                                                          \
 359         spi_unregister_driver(&fbtft_driver_spi_driver);                   \
 360         platform_driver_unregister(&fbtft_driver_platform_driver);         \
 361 }                                                                          \
 362                                                                            \
 363 module_init(fbtft_driver_module_init);                                     \
 364 module_exit(fbtft_driver_module_exit);
 365
 366 /* Debug macros */
 367
 368 /* shorthand debug levels */
 369 #define DEBUG_LEVEL_1   DEBUG_REQUEST_GPIOS
 370 #define DEBUG_LEVEL_2   (DEBUG_LEVEL_1 | DEBUG_DRIVER_INIT_FUNCTIONS | DEBUG_TIME_FIRST_UPDATE)
 371 #define DEBUG_LEVEL_3   (DEBUG_LEVEL_2 | DEBUG_RESET | DEBUG_INIT_DISPLAY | DEBUG_BLANK | DEBUG_REQUEST_GPIOS | DEBUG_FREE_GPIOS | DEBUG_VERIFY_GPIOS | DEBUG_BACKLIGHT | DEBUG_SYSFS)
 372 #define DEBUG_LEVEL_4   (DEBUG_LEVEL_2 | DEBUG_FB_READ | DEBUG_FB_WRITE | DEBUG_FB_FILLRECT | DEBUG_FB_COPYAREA | DEBUG_FB_IMAGEBLIT | DEBUG_FB_BLANK)
 373 #define DEBUG_LEVEL_5   (DEBUG_LEVEL_3 | DEBUG_UPDATE_DISPLAY)
 374 #define DEBUG_LEVEL_6   (DEBUG_LEVEL_4 | DEBUG_LEVEL_5)
 375 #define DEBUG_LEVEL_7   0xFFFFFFFF
 376
 377 #define DEBUG_DRIVER_INIT_FUNCTIONS (1<<3)
 378 #define DEBUG_TIME_FIRST_UPDATE     (1<<4)
 379 #define DEBUG_TIME_EACH_UPDATE      (1<<5)
 380 #define DEBUG_DEFERRED_IO           (1<<6)
 381 #define DEBUG_FBTFT_INIT_FUNCTIONS  (1<<7)
 382
 383 /* fbops */
 384 #define DEBUG_FB_READ               (1<<8)
 385 #define DEBUG_FB_WRITE              (1<<9)
 386 #define DEBUG_FB_FILLRECT           (1<<10)
 387 #define DEBUG_FB_COPYAREA           (1<<11)
 388 #define DEBUG_FB_IMAGEBLIT          (1<<12)
 389 #define DEBUG_FB_SETCOLREG          (1<<13)
 390 #define DEBUG_FB_BLANK              (1<<14)
 391
 392 #define DEBUG_SYSFS                 (1<<16)
 393
 394 /* fbtftops */
 395 #define DEBUG_BACKLIGHT             (1<<17)
 396 #define DEBUG_READ                  (1<<18)
 397 #define DEBUG_WRITE                 (1<<19)
 398 #define DEBUG_WRITE_VMEM            (1<<20)
 399 #define DEBUG_WRITE_REGISTER        (1<<21)
 400 #define DEBUG_SET_ADDR_WIN          (1<<22)
 401 #define DEBUG_RESET                 (1<<23)
 402 #define DEBUG_MKDIRTY               (1<<24)
 403 #define DEBUG_UPDATE_DISPLAY        (1<<25)
 404 #define DEBUG_INIT_DISPLAY          (1<<26)
 405 #define DEBUG_BLANK                 (1<<27)
 406 #define DEBUG_REQUEST_GPIOS         (1<<28)
 407 #define DEBUG_FREE_GPIOS            (1<<29)
 408 #define DEBUG_REQUEST_GPIOS_MATCH   (1<<30)
 409 #define DEBUG_VERIFY_GPIOS          (1<<31)
 410
 411 #define fbtft_init_dbg(dev, format, arg...)                  \
 412 do {                                                         \
 413         if (unlikely((dev)->platform_data &&                 \
 414             (((struct fbtft_platform_data *)(dev)->platform_data)->display.debug & DEBUG_DRIVER_INIT_FUNCTIONS))) \
 415                 dev_info(dev, format, ##arg);                \
 416 } while (0)
 417
 418 #define fbtft_par_dbg(level, par, format, arg...)            \
 419 do {                                                         \
 420         if (unlikely(par->debug & level))                    \
 421                 dev_info(par->info->device, format, ##arg);  \
 422 } while (0)
 423
 424 #define fbtft_par_dbg_hex(level, par, dev, type, buf, num, format, arg...) \
 425 do {                                                                       \
 426         if (unlikely(par->debug & level))                                  \
 427                 fbtft_dbg_hex(dev, sizeof(type), buf, num * sizeof(type), format, ##arg); \
 428 } while (0)
 429
 430 #endif /* __LINUX_FBTFT_H */