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