diff options
Diffstat (limited to 'drivers/video/auo_k1901fb.c')
| -rw-r--r-- | drivers/video/auo_k1901fb.c | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/drivers/video/auo_k1901fb.c b/drivers/video/auo_k1901fb.c new file mode 100644 index 0000000..1c054c1 --- /dev/null +++ b/drivers/video/auo_k1901fb.c @@ -0,0 +1,251 @@ +/* + * auok190xfb.c -- FB driver for AUO-K1901 controllers + * + * Copyright (C) 2011, 2012 Heiko Stuebner <heiko@sntech.de> + * + * based on broadsheetfb.c + * + * Copyright (C) 2008, Jaya Kumar + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven. + * + * This driver is written to be used with the AUO-K1901 display controller. + * + * It is intended to be architecture independent. A board specific driver + * must be used to perform all the physical IO interactions. + * + * The controller supports different update modes: + * mode0+1 16 step gray (4bit) + * mode2+3 4 step gray (2bit) + * mode4+5 2 step gray (1bit) + * - mode4 is described as "without LUT" + * mode7 automatic selection of update mode + * + * The most interesting difference to the K1900 is the ability to do screen + * updates in an asynchronous fashion. Where the K1900 needs to wait for the + * current update to complete, the K1901 can process later updates already. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/fb.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/list.h> +#include <linux/firmware.h> +#include <linux/gpio.h> +#include <linux/pm_runtime.h> + +#include <video/auo_k190xfb.h> + +#include "auo_k190x.h" + +/* + * AUO-K1901 specific commands + */ + +#define AUOK1901_CMD_LUT_INTERFACE 0x0005 +#define AUOK1901_CMD_DMA_START 0x1001 +#define AUOK1901_CMD_CURSOR_START 0x1007 +#define AUOK1901_CMD_CURSOR_STOP AUOK190X_CMD_DATA_STOP +#define AUOK1901_CMD_DDMA_START 0x1009 + +#define AUOK1901_INIT_GATE_PULSE_LOW (0 << 14) +#define AUOK1901_INIT_GATE_PULSE_HIGH (1 << 14) +#define AUOK1901_INIT_SINGLE_GATE (0 << 13) +#define AUOK1901_INIT_DOUBLE_GATE (1 << 13) + +/* Bits to pixels + * Mode 15-12 11-8 7-4 3-0 + * format2 2 T 1 T + * format3 1 T 2 T + * format4 T 2 T 1 + * format5 T 1 T 2 + * + * halftone modes: + * format6 2 2 1 1 + * format7 1 1 2 2 + */ +#define AUOK1901_INIT_FORMAT2 (1 << 7) +#define AUOK1901_INIT_FORMAT3 ((1 << 7) | (1 << 6)) +#define AUOK1901_INIT_FORMAT4 (1 << 8) +#define AUOK1901_INIT_FORMAT5 ((1 << 8) | (1 << 6)) +#define AUOK1901_INIT_FORMAT6 ((1 << 8) | (1 << 7)) +#define AUOK1901_INIT_FORMAT7 ((1 << 8) | (1 << 7) | (1 << 6)) + +/* res[4] to bit 10 + * res[3-0] to bits 5-2 + */ +#define AUOK1901_INIT_RESOLUTION(_res) (((_res & (1 << 4)) << 6) \ + | ((_res & 0xf) << 2)) + +/* + * portrait / landscape orientation in AUOK1901_CMD_DMA_START + */ +#define AUOK1901_DMA_ROTATE90(_rot) ((_rot & 1) << 13) + +/* + * equivalent to 1 << 11, needs the ~ to have same rotation like K1900 + */ +#define AUOK1901_DDMA_ROTATE180(_rot) ((~_rot & 2) << 10) + +static void auok1901_init(struct auok190xfb_par *par) +{ + struct auok190x_board *board = par->board; + u16 init_param = 0; + + init_param |= AUOK190X_INIT_INVERSE_WHITE; + init_param |= AUOK190X_INIT_FORMAT0; + init_param |= AUOK1901_INIT_RESOLUTION(par->resolution); + init_param |= AUOK190X_INIT_SHIFT_LEFT; + + auok190x_send_cmdargs(par, AUOK190X_CMD_INIT, 1, &init_param); + + /* let the controller finish */ + board->wait_for_rdy(par); +} + +static void auok1901_update_region(struct auok190xfb_par *par, int mode, + u16 y1, u16 y2) +{ + struct device *dev = par->info->device; + unsigned char *buf = (unsigned char *)par->info->screen_base; + int xres = par->info->var.xres; + u16 args[5]; + + pm_runtime_get_sync(dev); + + mutex_lock(&(par->io_lock)); + + /* y1 and y2 must be a multiple of 2 so drop the lowest bit */ + y1 &= 0xfffe; + y2 &= 0xfffe; + + dev_dbg(dev, "update (x,y,w,h,mode)=(%d,%d,%d,%d,%d)\n", + 1, y1+1, xres, y2-y1, mode); + + /* K1901: first transfer the region data */ + args[0] = AUOK1901_DMA_ROTATE90(par->rotation) | 1; + args[1] = y1 + 1; + args[2] = xres; + args[3] = y2 - y1; + buf += y1 * xres; + auok190x_send_cmdargs_pixels_nowait(par, AUOK1901_CMD_DMA_START, 4, + args, ((y2 - y1) * xres)/2, + (u16 *) buf); + auok190x_send_command_nowait(par, AUOK190X_CMD_DATA_STOP); + + /* K1901: second tell the controller to update the region with mode */ + args[0] = mode | AUOK1901_DDMA_ROTATE180(par->rotation); + args[1] = 1; + args[2] = y1 + 1; + args[3] = xres; + args[4] = y2 - y1; + auok190x_send_cmdargs_nowait(par, AUOK1901_CMD_DDMA_START, 5, args); + + par->update_cnt++; + + mutex_unlock(&(par->io_lock)); + + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); +} + +static void auok1901fb_dpy_update_pages(struct auok190xfb_par *par, + u16 y1, u16 y2) +{ + int mode; + + if (par->update_mode < 0) { + mode = AUOK190X_UPDATE_MODE(1); + par->last_mode = -1; + } else { + mode = AUOK190X_UPDATE_MODE(par->update_mode); + par->last_mode = par->update_mode; + } + + if (par->flash) + mode |= AUOK190X_UPDATE_NONFLASH; + + auok1901_update_region(par, mode, y1, y2); +} + +static void auok1901fb_dpy_update(struct auok190xfb_par *par) +{ + int mode; + + /* When doing full updates, wait for the controller to be ready + * This will hopefully catch some hangs of the K1901 + */ + par->board->wait_for_rdy(par); + + if (par->update_mode < 0) { + mode = AUOK190X_UPDATE_MODE(0); + par->last_mode = -1; + } else { + mode = AUOK190X_UPDATE_MODE(par->update_mode); + par->last_mode = par->update_mode; + } + + if (par->flash) + mode |= AUOK190X_UPDATE_NONFLASH; + + auok1901_update_region(par, mode, 0, par->info->var.yres); + par->update_cnt = 0; +} + +static bool auok1901fb_need_refresh(struct auok190xfb_par *par) +{ + return (par->update_cnt > 10); +} + +static int __devinit auok1901fb_probe(struct platform_device *pdev) +{ + struct auok190x_init_data init; + struct auok190x_board *board; + + /* pick up board specific routines */ + board = pdev->dev.platform_data; + if (!board) + return -EINVAL; + + /* fill temporary init struct for common init */ + init.id = "auo_k1901fb"; + init.board = board; + init.update_partial = auok1901fb_dpy_update_pages; + init.update_all = auok1901fb_dpy_update; + init.need_refresh = auok1901fb_need_refresh; + init.init = auok1901_init; + + return auok190x_common_probe(pdev, &init); +} + +static int __devexit auok1901fb_remove(struct platform_device *pdev) +{ + return auok190x_common_remove(pdev); +} + +static struct platform_driver auok1901fb_driver = { + .probe = auok1901fb_probe, + .remove = __devexit_p(auok1901fb_remove), + .driver = { + .owner = THIS_MODULE, + .name = "auo_k1901fb", + .pm = &auok190x_pm, + }, +}; +module_platform_driver(auok1901fb_driver); + +MODULE_DESCRIPTION("framebuffer driver for the AUO-K1901 EPD controller"); +MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); +MODULE_LICENSE("GPL"); |