297 lines
6.4 KiB
C
297 lines
6.4 KiB
C
/*
|
|
* am300epd.c -- Platform device for AM300 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.
|
|
*
|
|
* 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 Broadsheet display controller.
|
|
* on the AM300 EPD prototype kit/development kit with an E-Ink 800x600
|
|
* Vizplex EPD on a Gumstix board using the Broadsheet 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/gumstix.h>
|
|
#include <mach/mfp-pxa25x.h>
|
|
#include <mach/pxafb.h>
|
|
|
|
#include "generic.h"
|
|
|
|
#include <video/broadsheetfb.h>
|
|
|
|
static unsigned int panel_type = 6;
|
|
static struct platform_device *am300_device;
|
|
static struct broadsheet_board am300_board;
|
|
|
|
static unsigned long am300_pin_config[] __initdata = {
|
|
GPIO16_GPIO,
|
|
GPIO17_GPIO,
|
|
GPIO32_GPIO,
|
|
GPIO48_GPIO,
|
|
GPIO49_GPIO,
|
|
GPIO51_GPIO,
|
|
GPIO74_GPIO,
|
|
GPIO75_GPIO,
|
|
GPIO76_GPIO,
|
|
GPIO77_GPIO,
|
|
|
|
/* this is the 16-bit hdb bus 58-73 */
|
|
GPIO58_GPIO,
|
|
GPIO59_GPIO,
|
|
GPIO60_GPIO,
|
|
GPIO61_GPIO,
|
|
|
|
GPIO62_GPIO,
|
|
GPIO63_GPIO,
|
|
GPIO64_GPIO,
|
|
GPIO65_GPIO,
|
|
|
|
GPIO66_GPIO,
|
|
GPIO67_GPIO,
|
|
GPIO68_GPIO,
|
|
GPIO69_GPIO,
|
|
|
|
GPIO70_GPIO,
|
|
GPIO71_GPIO,
|
|
GPIO72_GPIO,
|
|
GPIO73_GPIO,
|
|
};
|
|
|
|
/* register offsets for gpio control */
|
|
#define PWR_GPIO_PIN 16
|
|
#define CFG_GPIO_PIN 17
|
|
#define RDY_GPIO_PIN 32
|
|
#define DC_GPIO_PIN 48
|
|
#define RST_GPIO_PIN 49
|
|
#define LED_GPIO_PIN 51
|
|
#define RD_GPIO_PIN 74
|
|
#define WR_GPIO_PIN 75
|
|
#define CS_GPIO_PIN 76
|
|
#define IRQ_GPIO_PIN 77
|
|
|
|
/* hdb bus */
|
|
#define DB0_GPIO_PIN 58
|
|
#define DB15_GPIO_PIN 73
|
|
|
|
static int gpios[] = { PWR_GPIO_PIN, CFG_GPIO_PIN, RDY_GPIO_PIN, DC_GPIO_PIN,
|
|
RST_GPIO_PIN, RD_GPIO_PIN, WR_GPIO_PIN, CS_GPIO_PIN,
|
|
IRQ_GPIO_PIN, LED_GPIO_PIN };
|
|
static char *gpio_names[] = { "PWR", "CFG", "RDY", "DC", "RST", "RD", "WR",
|
|
"CS", "IRQ", "LED" };
|
|
|
|
static int am300_wait_event(struct broadsheetfb_par *par)
|
|
{
|
|
/* todo: improve err recovery */
|
|
wait_event(par->waitq, gpio_get_value(RDY_GPIO_PIN));
|
|
return 0;
|
|
}
|
|
|
|
static int am300_init_gpio_regs(struct broadsheetfb_par *par)
|
|
{
|
|
int i;
|
|
int err;
|
|
char dbname[8];
|
|
|
|
for (i = 0; i < ARRAY_SIZE(gpios); i++) {
|
|
err = gpio_request(gpios[i], gpio_names[i]);
|
|
if (err) {
|
|
dev_err(&am300_device->dev, "failed requesting "
|
|
"gpio %s, err=%d\n", gpio_names[i], err);
|
|
goto err_req_gpio;
|
|
}
|
|
}
|
|
|
|
/* we also need to take care of the hdb bus */
|
|
for (i = DB0_GPIO_PIN; i <= DB15_GPIO_PIN; i++) {
|
|
sprintf(dbname, "DB%d", i);
|
|
err = gpio_request(i, dbname);
|
|
if (err) {
|
|
dev_err(&am300_device->dev, "failed requesting "
|
|
"gpio %d, err=%d\n", i, err);
|
|
goto err_req_gpio2;
|
|
}
|
|
}
|
|
|
|
/* setup the outputs and init values */
|
|
gpio_direction_output(PWR_GPIO_PIN, 0);
|
|
gpio_direction_output(CFG_GPIO_PIN, 1);
|
|
gpio_direction_output(DC_GPIO_PIN, 0);
|
|
gpio_direction_output(RD_GPIO_PIN, 1);
|
|
gpio_direction_output(WR_GPIO_PIN, 1);
|
|
gpio_direction_output(CS_GPIO_PIN, 1);
|
|
gpio_direction_output(RST_GPIO_PIN, 0);
|
|
|
|
/* setup the inputs */
|
|
gpio_direction_input(RDY_GPIO_PIN);
|
|
gpio_direction_input(IRQ_GPIO_PIN);
|
|
|
|
/* start the hdb bus as an input */
|
|
for (i = DB0_GPIO_PIN; i <= DB15_GPIO_PIN; i++)
|
|
gpio_direction_output(i, 0);
|
|
|
|
/* go into command mode */
|
|
gpio_set_value(CFG_GPIO_PIN, 1);
|
|
gpio_set_value(RST_GPIO_PIN, 0);
|
|
msleep(10);
|
|
gpio_set_value(RST_GPIO_PIN, 1);
|
|
msleep(10);
|
|
am300_wait_event(par);
|
|
|
|
return 0;
|
|
|
|
err_req_gpio2:
|
|
while (--i >= DB0_GPIO_PIN)
|
|
gpio_free(i);
|
|
i = ARRAY_SIZE(gpios);
|
|
err_req_gpio:
|
|
while (--i >= 0)
|
|
gpio_free(gpios[i]);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int am300_init_board(struct broadsheetfb_par *par)
|
|
{
|
|
return am300_init_gpio_regs(par);
|
|
}
|
|
|
|
static void am300_cleanup(struct broadsheetfb_par *par)
|
|
{
|
|
int i;
|
|
|
|
free_irq(PXA_GPIO_TO_IRQ(RDY_GPIO_PIN), par);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(gpios); i++)
|
|
gpio_free(gpios[i]);
|
|
|
|
for (i = DB0_GPIO_PIN; i <= DB15_GPIO_PIN; i++)
|
|
gpio_free(i);
|
|
|
|
}
|
|
|
|
static u16 am300_get_hdb(struct broadsheetfb_par *par)
|
|
{
|
|
u16 res = 0;
|
|
int i;
|
|
|
|
for (i = 0; i <= (DB15_GPIO_PIN - DB0_GPIO_PIN) ; i++)
|
|
res |= (gpio_get_value(DB0_GPIO_PIN + i)) ? (1 << i) : 0;
|
|
|
|
return res;
|
|
}
|
|
|
|
static void am300_set_hdb(struct broadsheetfb_par *par, u16 data)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i <= (DB15_GPIO_PIN - DB0_GPIO_PIN) ; i++)
|
|
gpio_set_value(DB0_GPIO_PIN + i, (data >> i) & 0x01);
|
|
}
|
|
|
|
|
|
static void am300_set_ctl(struct broadsheetfb_par *par, unsigned char bit,
|
|
u8 state)
|
|
{
|
|
switch (bit) {
|
|
case BS_CS:
|
|
gpio_set_value(CS_GPIO_PIN, state);
|
|
break;
|
|
case BS_DC:
|
|
gpio_set_value(DC_GPIO_PIN, state);
|
|
break;
|
|
case BS_WR:
|
|
gpio_set_value(WR_GPIO_PIN, state);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int am300_get_panel_type(void)
|
|
{
|
|
return panel_type;
|
|
}
|
|
|
|
static irqreturn_t am300_handle_irq(int irq, void *dev_id)
|
|
{
|
|
struct broadsheetfb_par *par = dev_id;
|
|
|
|
wake_up(&par->waitq);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int am300_setup_irq(struct fb_info *info)
|
|
{
|
|
int ret;
|
|
struct broadsheetfb_par *par = info->par;
|
|
|
|
ret = request_irq(PXA_GPIO_TO_IRQ(RDY_GPIO_PIN), am300_handle_irq,
|
|
IRQF_DISABLED|IRQF_TRIGGER_RISING,
|
|
"AM300", par);
|
|
if (ret)
|
|
dev_err(&am300_device->dev, "request_irq failed: %d\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct broadsheet_board am300_board = {
|
|
.owner = THIS_MODULE,
|
|
.init = am300_init_board,
|
|
.cleanup = am300_cleanup,
|
|
.set_hdb = am300_set_hdb,
|
|
.get_hdb = am300_get_hdb,
|
|
.set_ctl = am300_set_ctl,
|
|
.wait_for_rdy = am300_wait_event,
|
|
.get_panel_type = am300_get_panel_type,
|
|
.setup_irq = am300_setup_irq,
|
|
};
|
|
|
|
int __init am300_init(void)
|
|
{
|
|
int ret;
|
|
|
|
pxa2xx_mfp_config(ARRAY_AND_SIZE(am300_pin_config));
|
|
|
|
/* request our platform independent driver */
|
|
request_module("broadsheetfb");
|
|
|
|
am300_device = platform_device_alloc("broadsheetfb", -1);
|
|
if (!am300_device)
|
|
return -ENOMEM;
|
|
|
|
/* the am300_board that will be seen by broadsheetfb is a copy */
|
|
platform_device_add_data(am300_device, &am300_board,
|
|
sizeof(am300_board));
|
|
|
|
ret = platform_device_add(am300_device);
|
|
|
|
if (ret) {
|
|
platform_device_put(am300_device);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
module_param(panel_type, uint, 0);
|
|
MODULE_PARM_DESC(panel_type, "Select the panel type: 37, 6, 97");
|
|
|
|
MODULE_DESCRIPTION("board driver for am300 epd kit");
|
|
MODULE_AUTHOR("Jaya Kumar");
|
|
MODULE_LICENSE("GPL");
|