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linux/arch/arm/mach-pxa/am200epd.c
Jaya Kumar 922613436a [ARM] 5200/1: am200epd: use fb notifiers and gpio api 
The original am200epd driver was designed with bad assumptions. It
manipulated GPSR/GPLR registers directly. It relied on direct access to the
pxa LCDC registers which have since conflicted with commit
ce4fb7b892 . This patch moves it into mach-pxa
and overhauls it to use a fb obtained through fb notifiers. It now uses the
generic GPIO api.

Signed-off-by: Jaya Kumar <jayakumar.lkml@gmail.com>
Acked-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Acked-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-08-26 17:01:14 +01:00

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/*
* am200epd.c -- Platform device for AM200 EPD kit
*
* Copyright (C) 2008, Jaya Kumar
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*
* Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
*
* This work was made possible by help and equipment support from E-Ink
* Corporation. http://support.eink.com/community
*
* This driver is written to be used with the Metronome display controller.
* on the AM200 EPD prototype kit/development kit with an E-Ink 800x600
* Vizplex EPD on a Gumstix board using the Lyre interface board.
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <mach/pxafb.h>
#include <video/metronomefb.h>
static unsigned int panel_type = 6;
static struct platform_device *am200_device;
static struct metronome_board am200_board;
static struct pxafb_mode_info am200_fb_mode_9inch7 = {
.pixclock = 40000,
.xres = 1200,
.yres = 842,
.bpp = 16,
.hsync_len = 2,
.left_margin = 2,
.right_margin = 2,
.vsync_len = 1,
.upper_margin = 2,
.lower_margin = 25,
.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
};
static struct pxafb_mode_info am200_fb_mode_8inch = {
.pixclock = 40000,
.xres = 1088,
.yres = 791,
.bpp = 16,
.hsync_len = 28,
.left_margin = 8,
.right_margin = 30,
.vsync_len = 8,
.upper_margin = 10,
.lower_margin = 8,
.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
};
static struct pxafb_mode_info am200_fb_mode_6inch = {
.pixclock = 40189,
.xres = 832,
.yres = 622,
.bpp = 16,
.hsync_len = 28,
.left_margin = 34,
.right_margin = 34,
.vsync_len = 25,
.upper_margin = 0,
.lower_margin = 2,
.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
};
static struct pxafb_mach_info am200_fb_info = {
.modes = &am200_fb_mode_6inch,
.num_modes = 1,
.lcd_conn = LCD_TYPE_COLOR_TFT | LCD_PCLK_EDGE_FALL |
LCD_AC_BIAS_FREQ(24),
};
/* register offsets for gpio control */
#define LED_GPIO_PIN 51
#define STDBY_GPIO_PIN 48
#define RST_GPIO_PIN 49
#define RDY_GPIO_PIN 32
#define ERR_GPIO_PIN 17
#define PCBPWR_GPIO_PIN 16
static int gpios[] = { LED_GPIO_PIN , STDBY_GPIO_PIN , RST_GPIO_PIN,
RDY_GPIO_PIN, ERR_GPIO_PIN, PCBPWR_GPIO_PIN };
static char *gpio_names[] = { "LED" , "STDBY" , "RST", "RDY", "ERR", "PCBPWR" };
static int am200_init_gpio_regs(struct metronomefb_par *par)
{
int i;
int err;
for (i = 0; i < ARRAY_SIZE(gpios); i++) {
err = gpio_request(gpios[i], gpio_names[i]);
if (err) {
dev_err(&am200_device->dev, "failed requesting "
"gpio %s, err=%d\n", gpio_names[i], err);
goto err_req_gpio;
}
}
gpio_direction_output(LED_GPIO_PIN, 0);
gpio_direction_output(STDBY_GPIO_PIN, 0);
gpio_direction_output(RST_GPIO_PIN, 0);
gpio_direction_input(RDY_GPIO_PIN);
gpio_direction_input(ERR_GPIO_PIN);
gpio_direction_output(PCBPWR_GPIO_PIN, 0);
return 0;
err_req_gpio:
while (i > 0)
gpio_free(gpios[i--]);
return err;
}
static void am200_cleanup(struct metronomefb_par *par)
{
int i;
free_irq(IRQ_GPIO(RDY_GPIO_PIN), par);
for (i = 0; i < ARRAY_SIZE(gpios); i++)
gpio_free(gpios[i]);
}
static int am200_share_video_mem(struct fb_info *info)
{
/* rough check if this is our desired fb and not something else */
if ((info->var.xres != am200_fb_info.modes->xres)
|| (info->var.yres != am200_fb_info.modes->yres))
return 0;
/* we've now been notified that we have our new fb */
am200_board.metromem = info->screen_base;
am200_board.host_fbinfo = info;
/* try to refcount host drv since we are the consumer after this */
if (!try_module_get(info->fbops->owner))
return -ENODEV;
return 0;
}
static int am200_unshare_video_mem(struct fb_info *info)
{
dev_dbg(&am200_device->dev, "ENTER %s\n", __func__);
if (info != am200_board.host_fbinfo)
return 0;
module_put(am200_board.host_fbinfo->fbops->owner);
return 0;
}
static int am200_fb_notifier_callback(struct notifier_block *self,
unsigned long event, void *data)
{
struct fb_event *evdata = data;
struct fb_info *info = evdata->info;
dev_dbg(&am200_device->dev, "ENTER %s\n", __func__);
if (event == FB_EVENT_FB_REGISTERED)
return am200_share_video_mem(info);
else if (event == FB_EVENT_FB_UNREGISTERED)
return am200_unshare_video_mem(info);
return 0;
}
static struct notifier_block am200_fb_notif = {
.notifier_call = am200_fb_notifier_callback,
};
/* this gets called as part of our init. these steps must be done now so
* that we can use set_pxa_fb_info */
static void __init am200_presetup_fb(void)
{
int fw;
int fh;
int padding_size;
int totalsize;
switch (panel_type) {
case 6:
am200_fb_info.modes = &am200_fb_mode_6inch;
break;
case 8:
am200_fb_info.modes = &am200_fb_mode_8inch;
break;
case 97:
am200_fb_info.modes = &am200_fb_mode_9inch7;
break;
default:
dev_err(&am200_device->dev, "invalid panel_type selection,"
" setting to 6\n");
am200_fb_info.modes = &am200_fb_mode_6inch;
break;
}
/* the frame buffer is divided as follows:
command | CRC | padding
16kb waveform data | CRC | padding
image data | CRC
*/
fw = am200_fb_info.modes->xres;
fh = am200_fb_info.modes->yres;
/* waveform must be 16k + 2 for checksum */
am200_board.wfm_size = roundup(16*1024 + 2, fw);
padding_size = PAGE_SIZE + (4 * fw);
/* total is 1 cmd , 1 wfm, padding and image */
totalsize = fw + am200_board.wfm_size + padding_size + (fw*fh);
/* save this off because we're manipulating fw after this and
* we'll need it when we're ready to setup the framebuffer */
am200_board.fw = fw;
am200_board.fh = fh;
/* the reason we do this adjustment is because we want to acquire
* more framebuffer memory without imposing custom awareness on the
* underlying pxafb driver */
am200_fb_info.modes->yres = DIV_ROUND_UP(totalsize, fw);
/* we divide since we told the LCD controller we're 16bpp */
am200_fb_info.modes->xres /= 2;
set_pxa_fb_info(&am200_fb_info);
}
/* this gets called by metronomefb as part of its init, in our case, we
* have already completed initial framebuffer init in presetup_fb so we
* can just setup the fb access pointers */
static int am200_setup_fb(struct metronomefb_par *par)
{
int fw;
int fh;
fw = am200_board.fw;
fh = am200_board.fh;
/* metromem was set up by the notifier in share_video_mem so now
* we can use its value to calculate the other entries */
par->metromem_cmd = (struct metromem_cmd *) am200_board.metromem;
par->metromem_wfm = am200_board.metromem + fw;
par->metromem_img = par->metromem_wfm + am200_board.wfm_size;
par->metromem_img_csum = (u16 *) (par->metromem_img + (fw * fh));
par->metromem_dma = am200_board.host_fbinfo->fix.smem_start;
return 0;
}
static int am200_get_panel_type(void)
{
return panel_type;
}
static irqreturn_t am200_handle_irq(int irq, void *dev_id)
{
struct metronomefb_par *par = dev_id;
wake_up_interruptible(&par->waitq);
return IRQ_HANDLED;
}
static int am200_setup_irq(struct fb_info *info)
{
int ret;
ret = request_irq(IRQ_GPIO(RDY_GPIO_PIN), am200_handle_irq,
IRQF_DISABLED|IRQF_TRIGGER_FALLING,
"AM200", info->par);
if (ret)
dev_err(&am200_device->dev, "request_irq failed: %d\n", ret);
return ret;
}
static void am200_set_rst(struct metronomefb_par *par, int state)
{
gpio_set_value(RST_GPIO_PIN, state);
}
static void am200_set_stdby(struct metronomefb_par *par, int state)
{
gpio_set_value(STDBY_GPIO_PIN, state);
}
static int am200_wait_event(struct metronomefb_par *par)
{
return wait_event_timeout(par->waitq, gpio_get_value(RDY_GPIO_PIN), HZ);
}
static int am200_wait_event_intr(struct metronomefb_par *par)
{
return wait_event_interruptible_timeout(par->waitq,
gpio_get_value(RDY_GPIO_PIN), HZ);
}
static struct metronome_board am200_board = {
.owner = THIS_MODULE,
.setup_irq = am200_setup_irq,
.setup_io = am200_init_gpio_regs,
.setup_fb = am200_setup_fb,
.set_rst = am200_set_rst,
.set_stdby = am200_set_stdby,
.met_wait_event = am200_wait_event,
.met_wait_event_intr = am200_wait_event_intr,
.get_panel_type = am200_get_panel_type,
.cleanup = am200_cleanup,
};
static int __init am200_init(void)
{
int ret;
/* before anything else, we request notification for any fb
* creation events */
fb_register_client(&am200_fb_notif);
/* request our platform independent driver */
request_module("metronomefb");
am200_device = platform_device_alloc("metronomefb", -1);
if (!am200_device)
return -ENOMEM;
/* the am200_board that will be seen by metronomefb is a copy */
platform_device_add_data(am200_device, &am200_board,
sizeof(am200_board));
/* this _add binds metronomefb to am200. metronomefb refcounts am200 */
ret = platform_device_add(am200_device);
if (ret) {
platform_device_put(am200_device);
fb_unregister_client(&am200_fb_notif);
return ret;
}
am200_presetup_fb();
return 0;
}
module_param(panel_type, uint, 0);
MODULE_PARM_DESC(panel_type, "Select the panel type: 6, 8, 97");
module_init(am200_init);
MODULE_DESCRIPTION("board driver for am200 metronome epd kit");
MODULE_AUTHOR("Jaya Kumar");
MODULE_LICENSE("GPL");
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