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>

1 files changed, 198 insertions, 0 deletions

diff --git a/drivers/video/auo_k1900fb.c b/drivers/video/auo_k1900fb.c
new file mode 100644
index 000000000000..c36cf961dcb2
--- /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");