drivers/staging/fbtft/fbtft.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /* Copyright (C) 2013 Noralf Tronnes */
   3
   4 #ifndef __LINUX_FBTFT_H
   5 #define __LINUX_FBTFT_H
   6
   7 #include <linux/fb.h>
   8 #include <linux/spinlock.h>
   9 #include <linux/spi/spi.h>
  10 #include <linux/platform_device.h>
  11
  12 #define FBTFT_ONBOARD_BACKLIGHT 2
  13
  14 #define FBTFT_GPIO_NO_MATCH             0xFFFF
  15 #define FBTFT_GPIO_NAME_SIZE    32
  16 #define FBTFT_MAX_INIT_SEQUENCE      512
  17 #define FBTFT_GAMMA_MAX_VALUES_TOTAL 128
  18
  19 #define FBTFT_OF_INIT_CMD       BIT(24)
  20 #define FBTFT_OF_INIT_DELAY     BIT(25)
  21
  22 /**
  23  * struct fbtft_gpio - Structure that holds one pinname to gpio mapping
  24  * @name: pinname (reset, dc, etc.)
  25  * @gpio: GPIO number
  26  *
  27  */
  28 struct fbtft_gpio {
  29         char name[FBTFT_GPIO_NAME_SIZE];
  30         unsigned int gpio;
  31 };
  32
  33 struct fbtft_par;
  34
  35 /**
  36  * struct fbtft_ops - FBTFT operations structure
  37  * @write: Writes to interface bus
  38  * @read: Reads from interface bus
  39  * @write_vmem: Writes video memory to display
  40  * @write_reg: Writes to controller register
  41  * @set_addr_win: Set the GRAM update window
  42  * @reset: Reset the LCD controller
  43  * @mkdirty: Marks display lines for update
  44  * @update_display: Updates the display
  45  * @init_display: Initializes the display
  46  * @blank: Blank the display (optional)
  47  * @request_gpios_match: Do pinname to gpio matching
  48  * @request_gpios: Request gpios from the kernel
  49  * @free_gpios: Free previously requested gpios
  50  * @verify_gpios: Verify that necessary gpios is present (optional)
  51  * @register_backlight: Used to register backlight device (optional)
  52  * @unregister_backlight: Unregister backlight device (optional)
  53  * @set_var: Configure LCD with values from variables like @rotate and @bgr
  54  *           (optional)
  55  * @set_gamma: Set Gamma curve (optional)
  56  *
  57  * Most of these operations have default functions assigned to them in
  58  *     fbtft_framebuffer_alloc()
  59  */
  60 struct fbtft_ops {
  61         int (*write)(struct fbtft_par *par, void *buf, size_t len);
  62         int (*read)(struct fbtft_par *par, void *buf, size_t len);
  63         int (*write_vmem)(struct fbtft_par *par, size_t offset, size_t len);
  64         void (*write_register)(struct fbtft_par *par, int len, ...);
  65
  66         void (*set_addr_win)(struct fbtft_par *par,
  67                 int xs, int ys, int xe, int ye);
  68         void (*reset)(struct fbtft_par *par);
  69         void (*mkdirty)(struct fb_info *info, int from, int to);
  70         void (*update_display)(struct fbtft_par *par,
  71                                 unsigned int start_line, unsigned int end_line);
  72         int (*init_display)(struct fbtft_par *par);
  73         int (*blank)(struct fbtft_par *par, bool on);
  74
  75         unsigned long (*request_gpios_match)(struct fbtft_par *par,
  76                 const struct fbtft_gpio *gpio);
  77         int (*request_gpios)(struct fbtft_par *par);
  78         int (*verify_gpios)(struct fbtft_par *par);
  79
  80         void (*register_backlight)(struct fbtft_par *par);
  81         void (*unregister_backlight)(struct fbtft_par *par);
  82
  83         int (*set_var)(struct fbtft_par *par);
  84         int (*set_gamma)(struct fbtft_par *par, u32 *curves);
  85 };
  86
  87 /**
  88  * struct fbtft_display - Describes the display properties
  89  * @width: Width of display in pixels
  90  * @height: Height of display in pixels
  91  * @regwidth: LCD Controller Register width in bits
  92  * @buswidth: Display interface bus width in bits
  93  * @backlight: Backlight type.
  94  * @fbtftops: FBTFT operations provided by driver or device (platform_data)
  95  * @bpp: Bits per pixel
  96  * @fps: Frames per second
  97  * @txbuflen: Size of transmit buffer
  98  * @init_sequence: Pointer to LCD initialization array
  99  * @gamma: String representation of Gamma curve(s)
 100  * @gamma_num: Number of Gamma curves
 101  * @gamma_len: Number of values per Gamma curve
 102  * @debug: Initial debug value
 103  *
 104  * This structure is not stored by FBTFT except for init_sequence.
 105  */
 106 struct fbtft_display {
 107         unsigned int width;
 108         unsigned int height;
 109         unsigned int regwidth;
 110         unsigned int buswidth;
 111         unsigned int backlight;
 112         struct fbtft_ops fbtftops;
 113         unsigned int bpp;
 114         unsigned int fps;
 115         int txbuflen;
 116         const s16 *init_sequence;
 117         char *gamma;
 118         int gamma_num;
 119         int gamma_len;
 120         unsigned long debug;
 121 };
 122
 123 /**
 124  * struct fbtft_platform_data - Passes display specific data to the driver
 125  * @display: Display properties
 126  * @gpios: Pointer to an array of pinname to gpio mappings
 127  * @rotate: Display rotation angle
 128  * @bgr: LCD Controller BGR bit
 129  * @fps: Frames per second (this will go away, use @fps in @fbtft_display)
 130  * @txbuflen: Size of transmit buffer
 131  * @startbyte: When set, enables use of Startbyte in transfers
 132  * @gamma: String representation of Gamma curve(s)
 133  * @extra: A way to pass extra info
 134  */
 135 struct fbtft_platform_data {
 136         struct fbtft_display display;
 137         const struct fbtft_gpio *gpios;
 138         unsigned int rotate;
 139         bool bgr;
 140         unsigned int fps;
 141         int txbuflen;
 142         u8 startbyte;
 143         char *gamma;
 144         void *extra;
 145 };
 146
 147 /**
 148  * struct fbtft_par - Main FBTFT data structure
 149  *
 150  * This structure holds all relevant data to operate the display
 151  *
 152  * See sourcefile for documentation since nested structs is not
 153  * supported by kernel-doc.
 154  *
 155  */
 156 /* @spi: Set if it is a SPI device
 157  * @pdev: Set if it is a platform device
 158  * @info: Pointer to framebuffer fb_info structure
 159  * @pdata: Pointer to platform data
 160  * @ssbuf: Not used
 161  * @pseudo_palette: Used by fb_set_colreg()
 162  * @txbuf.buf: Transmit buffer
 163  * @txbuf.len: Transmit buffer length
 164  * @buf: Small buffer used when writing init data over SPI
 165  * @startbyte: Used by some controllers when in SPI mode.
 166  *             Format: 6 bit Device id + RS bit + RW bit
 167  * @fbtftops: FBTFT operations provided by driver or device (platform_data)
 168  * @dirty_lock: Protects dirty_lines_start and dirty_lines_end
 169  * @dirty_lines_start: Where to begin updating display
 170  * @dirty_lines_end: Where to end updating display
 171  * @gpio.reset: GPIO used to reset display
 172  * @gpio.dc: Data/Command signal, also known as RS
 173  * @gpio.rd: Read latching signal
 174  * @gpio.wr: Write latching signal
 175  * @gpio.latch: Bus latch signal, eg. 16->8 bit bus latch
 176  * @gpio.cs: LCD Chip Select with parallel interface bus
 177  * @gpio.db[16]: Parallel databus
 178  * @gpio.led[16]: Led control signals
 179  * @gpio.aux[16]: Auxiliary signals, not used by core
 180  * @init_sequence: Pointer to LCD initialization array
 181  * @gamma.lock: Mutex for Gamma curve locking
 182  * @gamma.curves: Pointer to Gamma curve array
 183  * @gamma.num_values: Number of values per Gamma curve
 184  * @gamma.num_curves: Number of Gamma curves
 185  * @debug: Pointer to debug value
 186  * @current_debug:
 187  * @first_update_done: Used to only time the first display update
 188  * @update_time: Used to calculate 'fps' in debug output
 189  * @bgr: BGR mode/\n
 190  * @extra: Extra info needed by driver
 191  */
 192 struct fbtft_par {
 193         struct spi_device *spi;
 194         struct platform_device *pdev;
 195         struct fb_info *info;
 196         struct fbtft_platform_data *pdata;
 197         u16 *ssbuf;
 198         u32 pseudo_palette[16];
 199         struct {
 200                 void *buf;
 201                 size_t len;
 202         } txbuf;
 203         u8 *buf;
 204         u8 startbyte;
 205         struct fbtft_ops fbtftops;
 206         spinlock_t dirty_lock;
 207         unsigned int dirty_lines_start;
 208         unsigned int dirty_lines_end;
 209         struct {
 210                 int reset;
 211                 int dc;
 212                 int rd;
 213                 int wr;
 214                 int latch;
 215                 int cs;
 216                 int db[16];
 217                 int led[16];
 218                 int aux[16];
 219         } gpio;
 220         const s16 *init_sequence;
 221         struct {
 222                 struct mutex lock;
 223                 u32 *curves;
 224                 int num_values;
 225                 int num_curves;
 226         } gamma;
 227         unsigned long debug;
 228         bool first_update_done;
 229         ktime_t update_time;
 230         bool bgr;
 231         void *extra;
 232 };
 233
 234 #define NUMARGS(...)  (sizeof((int[]){__VA_ARGS__})/sizeof(int))
 235
 236 #define write_reg(par, ...)                                              \
 237         par->fbtftops.write_register(par, NUMARGS(__VA_ARGS__), __VA_ARGS__)
 238
 239 /* fbtft-core.c */
 240 int fbtft_write_buf_dc(struct fbtft_par *par, void *buf, size_t len, int dc);
 241 void fbtft_dbg_hex(const struct device *dev, int groupsize,
 242                    void *buf, size_t len, const char *fmt, ...);
 243 struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
 244                                         struct device *dev,
 245                                         struct fbtft_platform_data *pdata);
 246 void fbtft_framebuffer_release(struct fb_info *info);
 247 int fbtft_register_framebuffer(struct fb_info *fb_info);
 248 int fbtft_unregister_framebuffer(struct fb_info *fb_info);
 249 void fbtft_register_backlight(struct fbtft_par *par);
 250 void fbtft_unregister_backlight(struct fbtft_par *par);
 251 int fbtft_init_display(struct fbtft_par *par);
 252 int fbtft_probe_common(struct fbtft_display *display, struct spi_device *sdev,
 253                        struct platform_device *pdev);
 254 int fbtft_remove_common(struct device *dev, struct fb_info *info);
 255
 256 /* fbtft-io.c */
 257 int fbtft_write_spi(struct fbtft_par *par, void *buf, size_t len);
 258 int fbtft_write_spi_emulate_9(struct fbtft_par *par, void *buf, size_t len);
 259 int fbtft_read_spi(struct fbtft_par *par, void *buf, size_t len);
 260 int fbtft_write_gpio8_wr(struct fbtft_par *par, void *buf, size_t len);
 261 int fbtft_write_gpio16_wr(struct fbtft_par *par, void *buf, size_t len);
 262 int fbtft_write_gpio16_wr_latched(struct fbtft_par *par, void *buf, size_t len);
 263
 264 /* fbtft-bus.c */
 265 int fbtft_write_vmem8_bus8(struct fbtft_par *par, size_t offset, size_t len);
 266 int fbtft_write_vmem16_bus16(struct fbtft_par *par, size_t offset, size_t len);
 267 int fbtft_write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len);
 268 int fbtft_write_vmem16_bus9(struct fbtft_par *par, size_t offset, size_t len);
 269 void fbtft_write_reg8_bus8(struct fbtft_par *par, int len, ...);
 270 void fbtft_write_reg8_bus9(struct fbtft_par *par, int len, ...);
 271 void fbtft_write_reg16_bus8(struct fbtft_par *par, int len, ...);
 272 void fbtft_write_reg16_bus16(struct fbtft_par *par, int len, ...);
 273
 274 #define FBTFT_REGISTER_DRIVER(_name, _compatible, _display)                \
 275                                                                            \
 276 static int fbtft_driver_probe_spi(struct spi_device *spi)                  \
 277 {                                                                          \
 278         return fbtft_probe_common(_display, spi, NULL);                    \
 279 }                                                                          \
 280                                                                            \
 281 static int fbtft_driver_remove_spi(struct spi_device *spi)                 \
 282 {                                                                          \
 283         struct fb_info *info = spi_get_drvdata(spi);                       \
 284                                                                            \
 285         return fbtft_remove_common(&spi->dev, info);                       \
 286 }                                                                          \
 287                                                                            \
 288 static int fbtft_driver_probe_pdev(struct platform_device *pdev)           \
 289 {                                                                          \
 290         return fbtft_probe_common(_display, NULL, pdev);                   \
 291 }                                                                          \
 292                                                                            \
 293 static int fbtft_driver_remove_pdev(struct platform_device *pdev)          \
 294 {                                                                          \
 295         struct fb_info *info = platform_get_drvdata(pdev);                 \
 296                                                                            \
 297         return fbtft_remove_common(&pdev->dev, info);                      \
 298 }                                                                          \
 299                                                                            \
 300 static const struct of_device_id dt_ids[] = {                              \
 301         { .compatible = _compatible },                                     \
 302         {},                                                                \
 303 };                                                                         \
 304                                                                            \
 305 MODULE_DEVICE_TABLE(of, dt_ids);                                           \
 306                                                                            \
 307                                                                            \
 308 static struct spi_driver fbtft_driver_spi_driver = {                       \
 309         .driver = {                                                        \
 310                 .name   = _name,                                           \
 311                 .of_match_table = of_match_ptr(dt_ids),                    \
 312         },                                                                 \
 313         .probe  = fbtft_driver_probe_spi,                                  \
 314         .remove = fbtft_driver_remove_spi,                                 \
 315 };                                                                         \
 316                                                                            \
 317 static struct platform_driver fbtft_driver_platform_driver = {             \
 318         .driver = {                                                        \
 319                 .name   = _name,                                           \
 320                 .owner  = THIS_MODULE,                                     \
 321                 .of_match_table = of_match_ptr(dt_ids),                    \
 322         },                                                                 \
 323         .probe  = fbtft_driver_probe_pdev,                                 \
 324         .remove = fbtft_driver_remove_pdev,                                \
 325 };                                                                         \
 326                                                                            \
 327 static int __init fbtft_driver_module_init(void)                           \
 328 {                                                                          \
 329         int ret;                                                           \
 330                                                                            \
 331         ret = spi_register_driver(&fbtft_driver_spi_driver);               \
 332         if (ret < 0)                                                       \
 333                 return ret;                                                \
 334         return platform_driver_register(&fbtft_driver_platform_driver);    \
 335 }                                                                          \
 336                                                                            \
 337 static void __exit fbtft_driver_module_exit(void)                          \
 338 {                                                                          \
 339         spi_unregister_driver(&fbtft_driver_spi_driver);                   \
 340         platform_driver_unregister(&fbtft_driver_platform_driver);         \
 341 }                                                                          \
 342                                                                            \
 343 module_init(fbtft_driver_module_init);                                     \
 344 module_exit(fbtft_driver_module_exit);
 345
 346 /* Debug macros */
 347
 348 /* shorthand debug levels */
 349 #define DEBUG_LEVEL_1   DEBUG_REQUEST_GPIOS
 350 #define DEBUG_LEVEL_2   (DEBUG_LEVEL_1 | DEBUG_DRIVER_INIT_FUNCTIONS | DEBUG_TIME_FIRST_UPDATE)
 351 #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)
 352 #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)
 353 #define DEBUG_LEVEL_5   (DEBUG_LEVEL_3 | DEBUG_UPDATE_DISPLAY)
 354 #define DEBUG_LEVEL_6   (DEBUG_LEVEL_4 | DEBUG_LEVEL_5)
 355 #define DEBUG_LEVEL_7   0xFFFFFFFF
 356
 357 #define DEBUG_DRIVER_INIT_FUNCTIONS (1<<3)
 358 #define DEBUG_TIME_FIRST_UPDATE     (1<<4)
 359 #define DEBUG_TIME_EACH_UPDATE      (1<<5)
 360 #define DEBUG_DEFERRED_IO           (1<<6)
 361 #define DEBUG_FBTFT_INIT_FUNCTIONS  (1<<7)
 362
 363 /* fbops */
 364 #define DEBUG_FB_READ               (1<<8)
 365 #define DEBUG_FB_WRITE              (1<<9)
 366 #define DEBUG_FB_FILLRECT           (1<<10)
 367 #define DEBUG_FB_COPYAREA           (1<<11)
 368 #define DEBUG_FB_IMAGEBLIT          (1<<12)
 369 #define DEBUG_FB_SETCOLREG          (1<<13)
 370 #define DEBUG_FB_BLANK              (1<<14)
 371
 372 #define DEBUG_SYSFS                 (1<<16)
 373
 374 /* fbtftops */
 375 #define DEBUG_BACKLIGHT             (1<<17)
 376 #define DEBUG_READ                  (1<<18)
 377 #define DEBUG_WRITE                 (1<<19)
 378 #define DEBUG_WRITE_VMEM            (1<<20)
 379 #define DEBUG_WRITE_REGISTER        (1<<21)
 380 #define DEBUG_SET_ADDR_WIN          (1<<22)
 381 #define DEBUG_RESET                 (1<<23)
 382 #define DEBUG_MKDIRTY               (1<<24)
 383 #define DEBUG_UPDATE_DISPLAY        (1<<25)
 384 #define DEBUG_INIT_DISPLAY          (1<<26)
 385 #define DEBUG_BLANK                 (1<<27)
 386 #define DEBUG_REQUEST_GPIOS         (1<<28)
 387 #define DEBUG_FREE_GPIOS            (1<<29)
 388 #define DEBUG_REQUEST_GPIOS_MATCH   (1<<30)
 389 #define DEBUG_VERIFY_GPIOS          (1<<31)
 390
 391 #define fbtft_init_dbg(dev, format, arg...)                  \
 392 do {                                                         \
 393         if (unlikely((dev)->platform_data &&                 \
 394             (((struct fbtft_platform_data *)(dev)->platform_data)->display.debug & DEBUG_DRIVER_INIT_FUNCTIONS))) \
 395                 dev_info(dev, format, ##arg);                \
 396 } while (0)
 397
 398 #define fbtft_par_dbg(level, par, format, arg...)            \
 399 do {                                                         \
 400         if (unlikely(par->debug & level))                    \
 401                 dev_info(par->info->device, format, ##arg);  \
 402 } while (0)
 403
 404 #define fbtft_par_dbg_hex(level, par, dev, type, buf, num, format, arg...) \
 405 do {                                                                       \
 406         if (unlikely(par->debug & level))                                  \
 407                 fbtft_dbg_hex(dev, sizeof(type), buf, num * sizeof(type), format, ##arg); \
 408 } while (0)
 409
 410 #endif /* __LINUX_FBTFT_H */