LXR linux/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 */
  28struct fbtft_gpio {
  29        char name[FBTFT_GPIO_NAME_SIZE];
  30        unsigned int gpio;
  31};
  32
  33struct 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 */
  60struct 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 */
 106struct 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 */
 135struct 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 */
 192struct 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        bool polarity;
 233};
 234
 235#define NUMARGS(...)  (sizeof((int[]){__VA_ARGS__})/sizeof(int))
 236
 237#define write_reg(par, ...)                                            \
 238        ((par)->fbtftops.write_register(par, NUMARGS(__VA_ARGS__), __VA_ARGS__))
 239
 240/* fbtft-core.c */
 241int fbtft_write_buf_dc(struct fbtft_par *par, void *buf, size_t len, int dc);
 242void fbtft_dbg_hex(const struct device *dev, int groupsize,
 243                   void *buf, size_t len, const char *fmt, ...);
 244struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
 245                                        struct device *dev,
 246                                        struct fbtft_platform_data *pdata);
 247void fbtft_framebuffer_release(struct fb_info *info);
 248int fbtft_register_framebuffer(struct fb_info *fb_info);
 249int fbtft_unregister_framebuffer(struct fb_info *fb_info);
 250void fbtft_register_backlight(struct fbtft_par *par);
 251void fbtft_unregister_backlight(struct fbtft_par *par);
 252int fbtft_init_display(struct fbtft_par *par);
 253int fbtft_probe_common(struct fbtft_display *display, struct spi_device *sdev,
 254                       struct platform_device *pdev);
 255int fbtft_remove_common(struct device *dev, struct fb_info *info);
 256
 257/* fbtft-io.c */
 258int fbtft_write_spi(struct fbtft_par *par, void *buf, size_t len);
 259int fbtft_write_spi_emulate_9(struct fbtft_par *par, void *buf, size_t len);
 260int fbtft_read_spi(struct fbtft_par *par, void *buf, size_t len);
 261int fbtft_write_gpio8_wr(struct fbtft_par *par, void *buf, size_t len);
 262int fbtft_write_gpio16_wr(struct fbtft_par *par, void *buf, size_t len);
 263int fbtft_write_gpio16_wr_latched(struct fbtft_par *par, void *buf, size_t len);
 264
 265/* fbtft-bus.c */
 266int fbtft_write_vmem8_bus8(struct fbtft_par *par, size_t offset, size_t len);
 267int fbtft_write_vmem16_bus16(struct fbtft_par *par, size_t offset, size_t len);
 268int fbtft_write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len);
 269int fbtft_write_vmem16_bus9(struct fbtft_par *par, size_t offset, size_t len);
 270void fbtft_write_reg8_bus8(struct fbtft_par *par, int len, ...);
 271void fbtft_write_reg8_bus9(struct fbtft_par *par, int len, ...);
 272void fbtft_write_reg16_bus8(struct fbtft_par *par, int len, ...);
 273void fbtft_write_reg16_bus16(struct fbtft_par *par, int len, ...);
 274
 275#define FBTFT_REGISTER_DRIVER(_name, _compatible, _display)                \
 276                                                                           \
 277static int fbtft_driver_probe_spi(struct spi_device *spi)                  \
 278{                                                                          \
 279        return fbtft_probe_common(_display, spi, NULL);                    \
 280}                                                                          \
 281                                                                           \
 282static int fbtft_driver_remove_spi(struct spi_device *spi)                 \
 283{                                                                          \
 284        struct fb_info *info = spi_get_drvdata(spi);                       \
 285                                                                           \
 286        return fbtft_remove_common(&spi->dev, info);                       \
 287}                                                                          \
 288                                                                           \
 289static int fbtft_driver_probe_pdev(struct platform_device *pdev)           \
 290{                                                                          \
 291        return fbtft_probe_common(_display, NULL, pdev);                   \
 292}                                                                          \
 293                                                                           \
 294static int fbtft_driver_remove_pdev(struct platform_device *pdev)          \
 295{                                                                          \
 296        struct fb_info *info = platform_get_drvdata(pdev);                 \
 297                                                                           \
 298        return fbtft_remove_common(&pdev->dev, info);                      \
 299}                                                                          \
 300                                                                           \
 301static const struct of_device_id dt_ids[] = {                              \
 302        { .compatible = _compatible },                                     \
 303        {},                                                                \
 304};                                                                         \
 305                                                                           \
 306MODULE_DEVICE_TABLE(of, dt_ids);                                           \
 307                                                                           \
 308                                                                           \
 309static struct spi_driver fbtft_driver_spi_driver = {                       \
 310        .driver = {                                                        \
 311                .name   = _name,                                           \
 312                .of_match_table = of_match_ptr(dt_ids),                    \
 313        },                                                                 \
 314        .probe  = fbtft_driver_probe_spi,                                  \
 315        .remove = fbtft_driver_remove_spi,                                 \
 316};                                                                         \
 317                                                                           \
 318static struct platform_driver fbtft_driver_platform_driver = {             \
 319        .driver = {                                                        \
 320                .name   = _name,                                           \
 321                .owner  = THIS_MODULE,                                     \
 322                .of_match_table = of_match_ptr(dt_ids),                    \
 323        },                                                                 \
 324        .probe  = fbtft_driver_probe_pdev,                                 \
 325        .remove = fbtft_driver_remove_pdev,                                \
 326};                                                                         \
 327                                                                           \
 328static int __init fbtft_driver_module_init(void)                           \
 329{                                                                          \
 330        int ret;                                                           \
 331                                                                           \
 332        ret = spi_register_driver(&fbtft_driver_spi_driver);               \
 333        if (ret < 0)                                                       \
 334                return ret;                                                \
 335        return platform_driver_register(&fbtft_driver_platform_driver);    \
 336}                                                                          \
 337                                                                           \
 338static void __exit fbtft_driver_module_exit(void)                          \
 339{                                                                          \
 340        spi_unregister_driver(&fbtft_driver_spi_driver);                   \
 341        platform_driver_unregister(&fbtft_driver_platform_driver);         \
 342}                                                                          \
 343                                                                           \
 344module_init(fbtft_driver_module_init);                                     \
 345module_exit(fbtft_driver_module_exit);
 346
 347/* Debug macros */
 348
 349/* shorthand debug levels */
 350#define DEBUG_LEVEL_1   DEBUG_REQUEST_GPIOS
 351#define DEBUG_LEVEL_2   (DEBUG_LEVEL_1 | DEBUG_DRIVER_INIT_FUNCTIONS | DEBUG_TIME_FIRST_UPDATE)
 352#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)
 353#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)
 354#define DEBUG_LEVEL_5   (DEBUG_LEVEL_3 | DEBUG_UPDATE_DISPLAY)
 355#define DEBUG_LEVEL_6   (DEBUG_LEVEL_4 | DEBUG_LEVEL_5)
 356#define DEBUG_LEVEL_7   0xFFFFFFFF
 357
 358#define DEBUG_DRIVER_INIT_FUNCTIONS (1<<3)
 359#define DEBUG_TIME_FIRST_UPDATE     (1<<4)
 360#define DEBUG_TIME_EACH_UPDATE      (1<<5)
 361#define DEBUG_DEFERRED_IO           (1<<6)
 362#define DEBUG_FBTFT_INIT_FUNCTIONS  (1<<7)
 363
 364/* fbops */
 365#define DEBUG_FB_READ               (1<<8)
 366#define DEBUG_FB_WRITE              (1<<9)
 367#define DEBUG_FB_FILLRECT           (1<<10)
 368#define DEBUG_FB_COPYAREA           (1<<11)
 369#define DEBUG_FB_IMAGEBLIT          (1<<12)
 370#define DEBUG_FB_SETCOLREG          (1<<13)
 371#define DEBUG_FB_BLANK              (1<<14)
 372
 373#define DEBUG_SYSFS                 (1<<16)
 374
 375/* fbtftops */
 376#define DEBUG_BACKLIGHT             (1<<17)
 377#define DEBUG_READ                  (1<<18)
 378#define DEBUG_WRITE                 (1<<19)
 379#define DEBUG_WRITE_VMEM            (1<<20)
 380#define DEBUG_WRITE_REGISTER        (1<<21)
 381#define DEBUG_SET_ADDR_WIN          (1<<22)
 382#define DEBUG_RESET                 (1<<23)
 383#define DEBUG_MKDIRTY               (1<<24)
 384#define DEBUG_UPDATE_DISPLAY        (1<<25)
 385#define DEBUG_INIT_DISPLAY          (1<<26)
 386#define DEBUG_BLANK                 (1<<27)
 387#define DEBUG_REQUEST_GPIOS         (1<<28)
 388#define DEBUG_FREE_GPIOS            (1<<29)
 389#define DEBUG_REQUEST_GPIOS_MATCH   (1<<30)
 390#define DEBUG_VERIFY_GPIOS          (1<<31)
 391
 392#define fbtft_init_dbg(dev, format, arg...)                  \
 393do {                                                         \
 394        if (unlikely((dev)->platform_data &&                 \
 395            (((struct fbtft_platform_data *)(dev)->platform_data)->display.debug & DEBUG_DRIVER_INIT_FUNCTIONS))) \
 396                dev_info(dev, format, ##arg);                \
 397} while (0)
 398
 399#define fbtft_par_dbg(level, par, format, arg...)            \
 400do {                                                         \
 401        if (unlikely(par->debug & level))                    \
 402                dev_info(par->info->device, format, ##arg);  \
 403} while (0)
 404
 405#define fbtft_par_dbg_hex(level, par, dev, type, buf, num, format, arg...) \
 406do {                                                                       \
 407        if (unlikely((par)->debug & (level)))                                  \
 408                fbtft_dbg_hex(dev, sizeof(type), buf,\
 409                              (num) * sizeof(type), format, ##arg); \
 410} while (0)
 411
 412#endif /* __LINUX_FBTFT_H */
 413