video: auo_k190x: add driver for AUO-K1900 variant

This controller only supports smaller resolutions and only serial
updates, i.e. it has to wait for an update to finish before
starting another one.

Signed-off-by: Heiko Stübner <heiko@sntech.de>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index caf9eaa..9ad0753 100644 (file)
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -2399,6 +2399,14 @@ config FB_AUO_K190X
          controller drivers. You will also have to enable the driver
          for the controller type used in your device.
 
+config FB_AUO_K1900
+       tristate "AUO-K1900 EPD controller support"
+       depends on FB && FB_AUO_K190X
+       help
+         This driver implements support for the AUO K1900 epd-controller.
+         This controller can drive Sipix epaper displays but can only do
+         serial updates, reducing the number of possible frames per second.
+
 config FB_JZ4740
        tristate "JZ4740 LCD framebuffer support"
        depends on FB && MACH_JZ4740

diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index d5406f2..e84df73 100644 (file)
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -119,6 +119,7 @@ obj-$(CONFIG_FB_MAXINE)               += maxinefb.o
 obj-$(CONFIG_FB_METRONOME)        += metronomefb.o
 obj-$(CONFIG_FB_BROADSHEET)       += broadsheetfb.o
 obj-$(CONFIG_FB_AUO_K190X)       += auo_k190x.o
+obj-$(CONFIG_FB_AUO_K1900)       += auo_k1900fb.o
 obj-$(CONFIG_FB_S1D13XXX)        += s1d13xxxfb.o
 obj-$(CONFIG_FB_SH7760)                  += sh7760fb.o
 obj-$(CONFIG_FB_IMX)              += imxfb.o

diff --git a/drivers/video/auo_k1900fb.c b/drivers/video/auo_k1900fb.c
new file mode 100644 (file)
index 0000000..c36cf96
--- /dev/null
+++ b/drivers/video/auo_k1900fb.c
@@ -0,0 +1,198 @@
+/*
+ * auok190xfb.c -- FB driver for AUO-K1900 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-K1900 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 4 step gray (2bit) - FIXME: add strange refresh
+ * mode3 2 step gray (1bit) - FIXME: add strange refresh
+ * mode4 handwriting mode (strange behaviour)
+ * mode5 automatic selection of update mode
+ */
+
+#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-K1900 specific commands
+ */
+
+#define AUOK1900_CMD_PARTIALDISP       0x1001
+#define AUOK1900_CMD_ROTATION          0x1006
+#define AUOK1900_CMD_LUT_STOP          0x1009
+
+#define AUOK1900_INIT_TEMP_AVERAGE     (1 << 13)
+#define AUOK1900_INIT_ROTATE(_x)       ((_x & 0x3) << 10)
+#define AUOK1900_INIT_RESOLUTION(_res) ((_res & 0x7) << 2)
+
+static void auok1900_init(struct auok190xfb_par *par)
+{
+       struct auok190x_board *board = par->board;
+       u16 init_param = 0;
+
+       init_param |= AUOK1900_INIT_TEMP_AVERAGE;
+       init_param |= AUOK1900_INIT_ROTATE(par->rotation);
+       init_param |= AUOK190X_INIT_INVERSE_WHITE;
+       init_param |= AUOK190X_INIT_FORMAT0;
+       init_param |= AUOK1900_INIT_RESOLUTION(par->resolution);
+       init_param |= AUOK190X_INIT_SHIFT_RIGHT;
+
+       auok190x_send_cmdargs(par, AUOK190X_CMD_INIT, 1, &init_param);
+
+       /* let the controller finish */
+       board->wait_for_rdy(par);
+}
+
+static void auok1900_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[4];
+
+       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);
+
+       /* to FIX handle different partial update modes */
+       args[0] = mode | 1;
+       args[1] = y1 + 1;
+       args[2] = xres;
+       args[3] = y2 - y1;
+       buf += y1 * xres;
+       auok190x_send_cmdargs_pixels(par, AUOK1900_CMD_PARTIALDISP, 4, args,
+                                    ((y2 - y1) * xres)/2, (u16 *) buf);
+       auok190x_send_command(par, AUOK190X_CMD_DATA_STOP);
+
+       par->update_cnt++;
+
+       mutex_unlock(&(par->io_lock));
+
+       pm_runtime_mark_last_busy(dev);
+       pm_runtime_put_autosuspend(dev);
+}
+
+static void auok1900fb_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;
+
+       auok1900_update_region(par, mode, y1, y2);
+}
+
+static void auok1900fb_dpy_update(struct auok190xfb_par *par)
+{
+       int mode;
+
+       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;
+
+       auok1900_update_region(par, mode, 0, par->info->var.yres);
+       par->update_cnt = 0;
+}
+
+static bool auok1900fb_need_refresh(struct auok190xfb_par *par)
+{
+       return (par->update_cnt > 10);
+}
+
+static int __devinit auok1900fb_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_k1900fb";
+       init.board = board;
+       init.update_partial = auok1900fb_dpy_update_pages;
+       init.update_all = auok1900fb_dpy_update;
+       init.need_refresh = auok1900fb_need_refresh;
+       init.init = auok1900_init;
+
+       return auok190x_common_probe(pdev, &init);
+}
+
+static int __devexit auok1900fb_remove(struct platform_device *pdev)
+{
+       return auok190x_common_remove(pdev);
+}
+
+static struct platform_driver auok1900fb_driver = {
+       .probe  = auok1900fb_probe,
+       .remove = __devexit_p(auok1900fb_remove),
+       .driver = {
+               .owner  = THIS_MODULE,
+               .name   = "auo_k1900fb",
+               .pm = &auok190x_pm,
+       },
+};
+module_platform_driver(auok1900fb_driver);
+
+MODULE_DESCRIPTION("framebuffer driver for the AUO-K1900 EPD controller");
+MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
+MODULE_LICENSE("GPL");