| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* Copyright (C) 2013 Noralf Tronnes */ |
| |
| #ifndef __LINUX_FBTFT_H |
| #define __LINUX_FBTFT_H |
| |
| #include <linux/fb.h> |
| #include <linux/spinlock.h> |
| #include <linux/spi/spi.h> |
| #include <linux/platform_device.h> |
| |
| #define FBTFT_ONBOARD_BACKLIGHT 2 |
| |
| #define FBTFT_GPIO_NO_MATCH 0xFFFF |
| #define FBTFT_GPIO_NAME_SIZE 32 |
| #define FBTFT_MAX_INIT_SEQUENCE 512 |
| #define FBTFT_GAMMA_MAX_VALUES_TOTAL 128 |
| |
| #define FBTFT_OF_INIT_CMD BIT(24) |
| #define FBTFT_OF_INIT_DELAY BIT(25) |
| |
| /** |
| * struct fbtft_gpio - Structure that holds one pinname to gpio mapping |
| * @name: pinname (reset, dc, etc.) |
| * @gpio: GPIO number |
| * |
| */ |
| struct fbtft_gpio { |
| char name[FBTFT_GPIO_NAME_SIZE]; |
| struct gpio_desc *gpio; |
| }; |
| |
| struct fbtft_par; |
| |
| /** |
| * struct fbtft_ops - FBTFT operations structure |
| * @write: Writes to interface bus |
| * @read: Reads from interface bus |
| * @write_vmem: Writes video memory to display |
| * @write_reg: Writes to controller register |
| * @set_addr_win: Set the GRAM update window |
| * @reset: Reset the LCD controller |
| * @mkdirty: Marks display lines for update |
| * @update_display: Updates the display |
| * @init_display: Initializes the display |
| * @blank: Blank the display (optional) |
| * @request_gpios_match: Do pinname to gpio matching |
| * @request_gpios: Request gpios from the kernel |
| * @free_gpios: Free previously requested gpios |
| * @verify_gpios: Verify that necessary gpios is present (optional) |
| * @register_backlight: Used to register backlight device (optional) |
| * @unregister_backlight: Unregister backlight device (optional) |
| * @set_var: Configure LCD with values from variables like @rotate and @bgr |
| * (optional) |
| * @set_gamma: Set Gamma curve (optional) |
| * |
| * Most of these operations have default functions assigned to them in |
| * fbtft_framebuffer_alloc() |
| */ |
| struct fbtft_ops { |
| int (*write)(struct fbtft_par *par, void *buf, size_t len); |
| int (*read)(struct fbtft_par *par, void *buf, size_t len); |
| int (*write_vmem)(struct fbtft_par *par, size_t offset, size_t len); |
| void (*write_register)(struct fbtft_par *par, int len, ...); |
| |
| void (*set_addr_win)(struct fbtft_par *par, |
| int xs, int ys, int xe, int ye); |
| void (*reset)(struct fbtft_par *par); |
| void (*mkdirty)(struct fb_info *info, int from, int to); |
| void (*update_display)(struct fbtft_par *par, |
| unsigned int start_line, unsigned int end_line); |
| int (*init_display)(struct fbtft_par *par); |
| int (*blank)(struct fbtft_par *par, bool on); |
| |
| unsigned long (*request_gpios_match)(struct fbtft_par *par, |
| const struct fbtft_gpio *gpio); |
| int (*request_gpios)(struct fbtft_par *par); |
| int (*verify_gpios)(struct fbtft_par *par); |
| |
| void (*register_backlight)(struct fbtft_par *par); |
| void (*unregister_backlight)(struct fbtft_par *par); |
| |
| int (*set_var)(struct fbtft_par *par); |
| int (*set_gamma)(struct fbtft_par *par, u32 *curves); |
| }; |
| |
| /** |
| * struct fbtft_display - Describes the display properties |
| * @width: Width of display in pixels |
| * @height: Height of display in pixels |
| * @regwidth: LCD Controller Register width in bits |
| * @buswidth: Display interface bus width in bits |
| * @backlight: Backlight type. |
| * @fbtftops: FBTFT operations provided by driver or device (platform_data) |
| * @bpp: Bits per pixel |
| * @fps: Frames per second |
| * @txbuflen: Size of transmit buffer |
| * @init_sequence: Pointer to LCD initialization array |
| * @gamma: String representation of Gamma curve(s) |
| * @gamma_num: Number of Gamma curves |
| * @gamma_len: Number of values per Gamma curve |
| * @debug: Initial debug value |
| * |
| * This structure is not stored by FBTFT except for init_sequence. |
| */ |
| struct fbtft_display { |
| unsigned int width; |
| unsigned int height; |
| unsigned int regwidth; |
| unsigned int buswidth; |
| unsigned int backlight; |
| struct fbtft_ops fbtftops; |
| unsigned int bpp; |
| unsigned int fps; |
| int txbuflen; |
| const s16 *init_sequence; |
| char *gamma; |
| int gamma_num; |
| int gamma_len; |
| unsigned long debug; |
| }; |
| |
| /** |
| * struct fbtft_platform_data - Passes display specific data to the driver |
| * @display: Display properties |
| * @gpios: Pointer to an array of pinname to gpio mappings |
| * @rotate: Display rotation angle |
| * @bgr: LCD Controller BGR bit |
| * @fps: Frames per second (this will go away, use @fps in @fbtft_display) |
| * @txbuflen: Size of transmit buffer |
| * @startbyte: When set, enables use of Startbyte in transfers |
| * @gamma: String representation of Gamma curve(s) |
| * @extra: A way to pass extra info |
| */ |
| struct fbtft_platform_data { |
| struct fbtft_display display; |
| unsigned int rotate; |
| bool bgr; |
| unsigned int fps; |
| int txbuflen; |
| u8 startbyte; |
| char *gamma; |
| void *extra; |
| }; |
| |
| /** |
| * struct fbtft_par - Main FBTFT data structure |
| * |
| * This structure holds all relevant data to operate the display |
| * |
| * See sourcefile for documentation since nested structs is not |
| * supported by kernel-doc. |
| * |
| */ |
| /* @spi: Set if it is a SPI device |
| * @pdev: Set if it is a platform device |
| * @info: Pointer to framebuffer fb_info structure |
| * @pdata: Pointer to platform data |
| * @ssbuf: Not used |
| * @pseudo_palette: Used by fb_set_colreg() |
| * @txbuf.buf: Transmit buffer |
| * @txbuf.len: Transmit buffer length |
| * @buf: Small buffer used when writing init data over SPI |
| * @startbyte: Used by some controllers when in SPI mode. |
| * Format: 6 bit Device id + RS bit + RW bit |
| * @fbtftops: FBTFT operations provided by driver or device (platform_data) |
| * @dirty_lock: Protects dirty_lines_start and dirty_lines_end |
| * @dirty_lines_start: Where to begin updating display |
| * @dirty_lines_end: Where to end updating display |
| * @gpio.reset: GPIO used to reset display |
| * @gpio.dc: Data/Command signal, also known as RS |
| * @gpio.rd: Read latching signal |
| * @gpio.wr: Write latching signal |
| * @gpio.latch: Bus latch signal, eg. 16->8 bit bus latch |
| * @gpio.cs: LCD Chip Select with parallel interface bus |
| * @gpio.db[16]: Parallel databus |
| * @gpio.led[16]: Led control signals |
| * @gpio.aux[16]: Auxiliary signals, not used by core |
| * @init_sequence: Pointer to LCD initialization array |
| * @gamma.lock: Mutex for Gamma curve locking |
| * @gamma.curves: Pointer to Gamma curve array |
| * @gamma.num_values: Number of values per Gamma curve |
| * @gamma.num_curves: Number of Gamma curves |
| * @debug: Pointer to debug value |
| * @current_debug: |
| * @first_update_done: Used to only time the first display update |
| * @update_time: Used to calculate 'fps' in debug output |
| * @bgr: BGR mode/\n |
| * @extra: Extra info needed by driver |
| */ |
| struct fbtft_par { |
| struct spi_device *spi; |
| struct platform_device *pdev; |
| struct fb_info *info; |
| struct fbtft_platform_data *pdata; |
| u16 *ssbuf; |
| u32 pseudo_palette[16]; |
| struct { |
| void *buf; |
| size_t len; |
| } txbuf; |
| u8 *buf; |
| u8 startbyte; |
| struct fbtft_ops fbtftops; |
| spinlock_t dirty_lock; |
| unsigned int dirty_lines_start; |
| unsigned int dirty_lines_end; |
| struct { |
| struct gpio_desc *reset; |
| struct gpio_desc *dc; |
| struct gpio_desc *rd; |
| struct gpio_desc *wr; |
| struct gpio_desc *latch; |
| struct gpio_desc *cs; |
| struct gpio_desc *db[16]; |
| struct gpio_desc *led[16]; |
| struct gpio_desc *aux[16]; |
| } gpio; |
| const s16 *init_sequence; |
| struct { |
| struct mutex lock; |
| u32 *curves; |
| int num_values; |
| int num_curves; |
| } gamma; |
| unsigned long debug; |
| bool first_update_done; |
| ktime_t update_time; |
| bool bgr; |
| void *extra; |
| bool polarity; |
| }; |
| |
| #define NUMARGS(...) (sizeof((int[]){__VA_ARGS__}) / sizeof(int)) |
| |
| #define write_reg(par, ...) \ |
| ((par)->fbtftops.write_register(par, NUMARGS(__VA_ARGS__), __VA_ARGS__)) |
| |
| /* fbtft-core.c */ |
| int fbtft_write_buf_dc(struct fbtft_par *par, void *buf, size_t len, int dc); |
| void fbtft_dbg_hex(const struct device *dev, int groupsize, |
| void *buf, size_t len, const char *fmt, ...); |
| struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display, |
| struct device *dev, |
| struct fbtft_platform_data *pdata); |
| void fbtft_framebuffer_release(struct fb_info *info); |
| int fbtft_register_framebuffer(struct fb_info *fb_info); |
| int fbtft_unregister_framebuffer(struct fb_info *fb_info); |
| void fbtft_register_backlight(struct fbtft_par *par); |
| void fbtft_unregister_backlight(struct fbtft_par *par); |
| int fbtft_init_display(struct fbtft_par *par); |
| int fbtft_probe_common(struct fbtft_display *display, struct spi_device *sdev, |
| struct platform_device *pdev); |
| int fbtft_remove_common(struct device *dev, struct fb_info *info); |
| |
| /* fbtft-io.c */ |
| int fbtft_write_spi(struct fbtft_par *par, void *buf, size_t len); |
| int fbtft_write_spi_emulate_9(struct fbtft_par *par, void *buf, size_t len); |
| int fbtft_read_spi(struct fbtft_par *par, void *buf, size_t len); |
| int fbtft_write_gpio8_wr(struct fbtft_par *par, void *buf, size_t len); |
| int fbtft_write_gpio16_wr(struct fbtft_par *par, void *buf, size_t len); |
| int fbtft_write_gpio16_wr_latched(struct fbtft_par *par, void *buf, size_t len); |
| |
| /* fbtft-bus.c */ |
| int fbtft_write_vmem8_bus8(struct fbtft_par *par, size_t offset, size_t len); |
| int fbtft_write_vmem16_bus16(struct fbtft_par *par, size_t offset, size_t len); |
| int fbtft_write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len); |
| int fbtft_write_vmem16_bus9(struct fbtft_par *par, size_t offset, size_t len); |
| void fbtft_write_reg8_bus8(struct fbtft_par *par, int len, ...); |
| void fbtft_write_reg8_bus9(struct fbtft_par *par, int len, ...); |
| void fbtft_write_reg16_bus8(struct fbtft_par *par, int len, ...); |
| void fbtft_write_reg16_bus16(struct fbtft_par *par, int len, ...); |
| |
| #define FBTFT_REGISTER_DRIVER(_name, _compatible, _display) \ |
| \ |
| static int fbtft_driver_probe_spi(struct spi_device *spi) \ |
| { \ |
| return fbtft_probe_common(_display, spi, NULL); \ |
| } \ |
| \ |
| static int fbtft_driver_remove_spi(struct spi_device *spi) \ |
| { \ |
| struct fb_info *info = spi_get_drvdata(spi); \ |
| \ |
| return fbtft_remove_common(&spi->dev, info); \ |
| } \ |
| \ |
| static int fbtft_driver_probe_pdev(struct platform_device *pdev) \ |
| { \ |
| return fbtft_probe_common(_display, NULL, pdev); \ |
| } \ |
| \ |
| static int fbtft_driver_remove_pdev(struct platform_device *pdev) \ |
| { \ |
| struct fb_info *info = platform_get_drvdata(pdev); \ |
| \ |
| return fbtft_remove_common(&pdev->dev, info); \ |
| } \ |
| \ |
| static const struct of_device_id dt_ids[] = { \ |
| { .compatible = _compatible }, \ |
| {}, \ |
| }; \ |
| \ |
| MODULE_DEVICE_TABLE(of, dt_ids); \ |
| \ |
| \ |
| static struct spi_driver fbtft_driver_spi_driver = { \ |
| .driver = { \ |
| .name = _name, \ |
| .of_match_table = of_match_ptr(dt_ids), \ |
| }, \ |
| .probe = fbtft_driver_probe_spi, \ |
| .remove = fbtft_driver_remove_spi, \ |
| }; \ |
| \ |
| static struct platform_driver fbtft_driver_platform_driver = { \ |
| .driver = { \ |
| .name = _name, \ |
| .owner = THIS_MODULE, \ |
| .of_match_table = of_match_ptr(dt_ids), \ |
| }, \ |
| .probe = fbtft_driver_probe_pdev, \ |
| .remove = fbtft_driver_remove_pdev, \ |
| }; \ |
| \ |
| static int __init fbtft_driver_module_init(void) \ |
| { \ |
| int ret; \ |
| \ |
| ret = spi_register_driver(&fbtft_driver_spi_driver); \ |
| if (ret < 0) \ |
| return ret; \ |
| return platform_driver_register(&fbtft_driver_platform_driver); \ |
| } \ |
| \ |
| static void __exit fbtft_driver_module_exit(void) \ |
| { \ |
| spi_unregister_driver(&fbtft_driver_spi_driver); \ |
| platform_driver_unregister(&fbtft_driver_platform_driver); \ |
| } \ |
| \ |
| module_init(fbtft_driver_module_init); \ |
| module_exit(fbtft_driver_module_exit); |
| |
| /* Debug macros */ |
| |
| /* shorthand debug levels */ |
| #define DEBUG_LEVEL_1 DEBUG_REQUEST_GPIOS |
| #define DEBUG_LEVEL_2 (DEBUG_LEVEL_1 | DEBUG_DRIVER_INIT_FUNCTIONS | DEBUG_TIME_FIRST_UPDATE) |
| #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) |
| #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) |
| #define DEBUG_LEVEL_5 (DEBUG_LEVEL_3 | DEBUG_UPDATE_DISPLAY) |
| #define DEBUG_LEVEL_6 (DEBUG_LEVEL_4 | DEBUG_LEVEL_5) |
| #define DEBUG_LEVEL_7 0xFFFFFFFF |
| |
| #define DEBUG_DRIVER_INIT_FUNCTIONS BIT(3) |
| #define DEBUG_TIME_FIRST_UPDATE BIT(4) |
| #define DEBUG_TIME_EACH_UPDATE BIT(5) |
| #define DEBUG_DEFERRED_IO BIT(6) |
| #define DEBUG_FBTFT_INIT_FUNCTIONS BIT(7) |
| |
| /* fbops */ |
| #define DEBUG_FB_READ BIT(8) |
| #define DEBUG_FB_WRITE BIT(9) |
| #define DEBUG_FB_FILLRECT BIT(10) |
| #define DEBUG_FB_COPYAREA BIT(11) |
| #define DEBUG_FB_IMAGEBLIT BIT(12) |
| #define DEBUG_FB_SETCOLREG BIT(13) |
| #define DEBUG_FB_BLANK BIT(14) |
| |
| #define DEBUG_SYSFS BIT(16) |
| |
| /* fbtftops */ |
| #define DEBUG_BACKLIGHT BIT(17) |
| #define DEBUG_READ BIT(18) |
| #define DEBUG_WRITE BIT(19) |
| #define DEBUG_WRITE_VMEM BIT(20) |
| #define DEBUG_WRITE_REGISTER BIT(21) |
| #define DEBUG_SET_ADDR_WIN BIT(22) |
| #define DEBUG_RESET BIT(23) |
| #define DEBUG_MKDIRTY BIT(24) |
| #define DEBUG_UPDATE_DISPLAY BIT(25) |
| #define DEBUG_INIT_DISPLAY BIT(26) |
| #define DEBUG_BLANK BIT(27) |
| #define DEBUG_REQUEST_GPIOS BIT(28) |
| #define DEBUG_FREE_GPIOS BIT(29) |
| #define DEBUG_REQUEST_GPIOS_MATCH BIT(30) |
| #define DEBUG_VERIFY_GPIOS BIT(31) |
| |
| #define fbtft_init_dbg(dev, format, arg...) \ |
| do { \ |
| if (unlikely((dev)->platform_data && \ |
| (((struct fbtft_platform_data *)(dev)->platform_data)->display.debug & DEBUG_DRIVER_INIT_FUNCTIONS))) \ |
| dev_info(dev, format, ##arg); \ |
| } while (0) |
| |
| #define fbtft_par_dbg(level, par, format, arg...) \ |
| do { \ |
| if (unlikely(par->debug & level)) \ |
| dev_info(par->info->device, format, ##arg); \ |
| } while (0) |
| |
| #define fbtft_par_dbg_hex(level, par, dev, type, buf, num, format, arg...) \ |
| do { \ |
| if (unlikely((par)->debug & (level))) \ |
| fbtft_dbg_hex(dev, sizeof(type), buf,\ |
| (num) * sizeof(type), format, ##arg); \ |
| } while (0) |
| |
| #endif /* __LINUX_FBTFT_H */ |
