You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
387 lines
9.4 KiB
387 lines
9.4 KiB
/*
|
|
* 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/pxa25x.h>
|
|
#include <mach/gumstix.h>
|
|
#include <mach/pxafb.h>
|
|
|
|
#include "generic.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 unsigned long am200_pin_config[] __initdata = {
|
|
GPIO51_GPIO,
|
|
GPIO49_GPIO,
|
|
GPIO48_GPIO,
|
|
GPIO32_GPIO,
|
|
GPIO17_GPIO,
|
|
GPIO16_GPIO,
|
|
};
|
|
|
|
int __init am200_init(void)
|
|
{
|
|
int ret;
|
|
|
|
/* before anything else, we request notification for any fb
|
|
* creation events */
|
|
fb_register_client(&am200_fb_notif);
|
|
|
|
pxa2xx_mfp_config(ARRAY_AND_SIZE(am200_pin_config));
|
|
|
|
/* 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_DESCRIPTION("board driver for am200 metronome epd kit");
|
|
MODULE_AUTHOR("Jaya Kumar");
|
|
MODULE_LICENSE("GPL");
|
|
|