drivers/video/am200epd.c - kernel/msm - Gitiles

 /*
  * linux/drivers/video/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/list.h>
 #include <linux/uaccess.h>
 #include <linux/irq.h>

 #include <video/metronomefb.h>

 #include <asm/arch/pxa-regs.h>

 /* 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

 #define AF_SEL_GPIO_N 0x3
 #define GAFR0_U_OFFSET(pin) ((pin - 16) * 2)
 #define GAFR1_L_OFFSET(pin) ((pin - 32) * 2)
 #define GAFR1_U_OFFSET(pin) ((pin - 48) * 2)
 #define GPDR1_OFFSET(pin) (pin - 32)
 #define GPCR1_OFFSET(pin) (pin - 32)
 #define GPSR1_OFFSET(pin) (pin - 32)
 #define GPCR0_OFFSET(pin) (pin)
 #define GPSR0_OFFSET(pin) (pin)

 static void am200_set_gpio_output(int pin, int val)
 {
 	u8 index;

 	index = pin >> 4;

 	switch (index) {
 	case 1:
 		if (val)
 			GPSR0 |= (1 << GPSR0_OFFSET(pin));
 		else
 			GPCR0 |= (1 << GPCR0_OFFSET(pin));
 		break;
 	case 2:
 		break;
 	case 3:
 		if (val)
 			GPSR1 |= (1 << GPSR1_OFFSET(pin));
 		else
 			GPCR1 |= (1 << GPCR1_OFFSET(pin));
 		break;
 	default:
 		printk(KERN_ERR "unimplemented\n");
 	}
 }

 static void __devinit am200_init_gpio_pin(int pin, int dir)
 {
 	u8 index;
 	/* dir 0 is output, 1 is input
 	- do 2 things here:
 	- set gpio alternate function to standard gpio
 	- set gpio direction to input or output  */

 	index = pin >> 4;
 	switch (index) {
 	case 1:
 		GAFR0_U &= ~(AF_SEL_GPIO_N << GAFR0_U_OFFSET(pin));

 		if (dir)
 			GPDR0 &= ~(1 << pin);
 		else
 			GPDR0 |= (1 << pin);
 		break;
 	case 2:
 		GAFR1_L &= ~(AF_SEL_GPIO_N << GAFR1_L_OFFSET(pin));

 		if (dir)
 			GPDR1 &= ~(1 << GPDR1_OFFSET(pin));
 		else
 			GPDR1 |= (1 << GPDR1_OFFSET(pin));
 		break;
 	case 3:
 		GAFR1_U &= ~(AF_SEL_GPIO_N << GAFR1_U_OFFSET(pin));

 		if (dir)
 			GPDR1 &= ~(1 << GPDR1_OFFSET(pin));
 		else
 			GPDR1 |= (1 << GPDR1_OFFSET(pin));
 		break;
 	default:
 		printk(KERN_ERR "unimplemented\n");
 	}
 }

 static void am200_init_gpio_regs(struct metronomefb_par *par)
 {
 	am200_init_gpio_pin(LED_GPIO_PIN, 0);
 	am200_set_gpio_output(LED_GPIO_PIN, 0);

 	am200_init_gpio_pin(STDBY_GPIO_PIN, 0);
 	am200_set_gpio_output(STDBY_GPIO_PIN, 0);

 	am200_init_gpio_pin(RST_GPIO_PIN, 0);
 	am200_set_gpio_output(RST_GPIO_PIN, 0);

 	am200_init_gpio_pin(RDY_GPIO_PIN, 1);

 	am200_init_gpio_pin(ERR_GPIO_PIN, 1);

 	am200_init_gpio_pin(PCBPWR_GPIO_PIN, 0);
 	am200_set_gpio_output(PCBPWR_GPIO_PIN, 0);
 }

 static void am200_disable_lcd_controller(struct metronomefb_par *par)
 {
 	LCSR = 0xffffffff;	/* Clear LCD Status Register */
 	LCCR0 |= LCCR0_DIS;	/* Disable LCD Controller */

 	/* we reset and just wait for things to settle */
 	msleep(200);
 }

 static void am200_enable_lcd_controller(struct metronomefb_par *par)
 {
 	LCSR = 0xffffffff;
 	FDADR0 = par->metromem_desc_dma;
 	LCCR0 |= LCCR0_ENB;
 }

 static void am200_init_lcdc_regs(struct metronomefb_par *par)
 {
 	/* here we do:
 	- disable the lcd controller
 	- setup lcd control registers
 	- setup dma descriptor
 	- reenable lcd controller
 	*/

 	/* disable the lcd controller */
 	am200_disable_lcd_controller(par);

 	/* setup lcd control registers */
 	LCCR0 = LCCR0_LDM | LCCR0_SFM | LCCR0_IUM | LCCR0_EFM | LCCR0_PAS
 		| LCCR0_QDM | LCCR0_BM | LCCR0_OUM;

 	LCCR1 = (par->info->var.xres/2 - 1) /* pixels per line */
 		| (27 << 10) /* hsync pulse width - 1 */
 		| (33 << 16) /* eol pixel count */
 		| (33 << 24); /* bol pixel count */

 	LCCR2 = (par->info->var.yres - 1) /* lines per panel */
 		| (24 << 10) /* vsync pulse width - 1 */
 		| (2 << 16) /* eof pixel count */
 		| (0 << 24); /* bof pixel count */

 	LCCR3 = 2 /* pixel clock divisor */
 		| (24 << 8) /* AC Bias pin freq */
 		| LCCR3_16BPP /* BPP */
 		| LCCR3_PCP;  /* PCP falling edge */

 }

 static void am200_post_dma_setup(struct metronomefb_par *par)
 {
 	par->metromem_desc->mFDADR0 = par->metromem_desc_dma;
 	par->metromem_desc->mFSADR0 = par->metromem_dma;
 	par->metromem_desc->mFIDR0 = 0;
 	par->metromem_desc->mLDCMD0 = par->info->var.xres
 					* par->info->var.yres;
 	am200_enable_lcd_controller(par);
 }

 static void am200_free_irq(struct fb_info *info)
 {
 	free_irq(IRQ_GPIO(RDY_GPIO_PIN), info);
 }

 static irqreturn_t am200_handle_irq(int irq, void *dev_id)
 {
 	struct fb_info *info = dev_id;
 	struct metronomefb_par *par = info->par;

 	wake_up_interruptible(&par->waitq);
 	return IRQ_HANDLED;
 }

 static int am200_setup_irq(struct fb_info *info)
 {
 	int retval;

 	retval = request_irq(IRQ_GPIO(RDY_GPIO_PIN), am200_handle_irq,
 				IRQF_DISABLED, "AM200", info);
 	if (retval) {
 		printk(KERN_ERR "am200epd: request_irq failed: %d\n", retval);
 		return retval;
 	}

 	return set_irq_type(IRQ_GPIO(RDY_GPIO_PIN), IRQT_FALLING);
 }

 static void am200_set_rst(struct metronomefb_par *par, int state)
 {
 	am200_set_gpio_output(RST_GPIO_PIN, state);
 }

 static void am200_set_stdby(struct metronomefb_par *par, int state)
 {
 	am200_set_gpio_output(STDBY_GPIO_PIN, state);
 }

 static int am200_wait_event(struct metronomefb_par *par)
 {
 	return wait_event_timeout(par->waitq, (GPLR1 & 0x01), HZ);
 }

 static int am200_wait_event_intr(struct metronomefb_par *par)
 {
 	return wait_event_interruptible_timeout(par->waitq, (GPLR1 & 0x01), HZ);
 }

 static struct metronome_board am200_board = {
 	.owner			= THIS_MODULE,
 	.free_irq		= am200_free_irq,
 	.setup_irq		= am200_setup_irq,
 	.init_gpio_regs		= am200_init_gpio_regs,
 	.init_lcdc_regs		= am200_init_lcdc_regs,
 	.post_dma_setup		= am200_post_dma_setup,
 	.set_rst		= am200_set_rst,
 	.set_stdby		= am200_set_stdby,
 	.met_wait_event		= am200_wait_event,
 	.met_wait_event_intr	= am200_wait_event_intr,
 };

 static struct platform_device *am200_device;

 static int __init am200_init(void)
 {
 	int ret;

 	/* request our platform independent driver */
 	request_module("metronomefb");

 	am200_device = platform_device_alloc("metronomefb", -1);
 	if (!am200_device)
 		return -ENOMEM;

 	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);

 	return ret;
 }

 static void __exit am200_exit(void)
 {
 	platform_device_unregister(am200_device);
 }

 module_init(am200_init);
 module_exit(am200_exit);

 MODULE_DESCRIPTION("board driver for am200 metronome epd kit");
 MODULE_AUTHOR("Jaya Kumar");
 MODULE_LICENSE("GPL");
	/*
	* linux/drivers/video/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/list.h>
	#include <linux/uaccess.h>
	#include <linux/irq.h>

	#include <video/metronomefb.h>

	#include <asm/arch/pxa-regs.h>

	/* 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

	#define AF_SEL_GPIO_N 0x3
	#define GAFR0_U_OFFSET(pin) ((pin - 16) * 2)
	#define GAFR1_L_OFFSET(pin) ((pin - 32) * 2)
	#define GAFR1_U_OFFSET(pin) ((pin - 48) * 2)
	#define GPDR1_OFFSET(pin) (pin - 32)
	#define GPCR1_OFFSET(pin) (pin - 32)
	#define GPSR1_OFFSET(pin) (pin - 32)
	#define GPCR0_OFFSET(pin) (pin)
	#define GPSR0_OFFSET(pin) (pin)

	static void am200_set_gpio_output(int pin, int val)
	{
	u8 index;

	index = pin >> 4;

	switch (index) {
	case 1:
	if (val)
	GPSR0 \|= (1 << GPSR0_OFFSET(pin));
	else
	GPCR0 \|= (1 << GPCR0_OFFSET(pin));
	break;
	case 2:
	break;
	case 3:
	if (val)
	GPSR1 \|= (1 << GPSR1_OFFSET(pin));
	else
	GPCR1 \|= (1 << GPCR1_OFFSET(pin));
	break;
	default:
	printk(KERN_ERR "unimplemented\n");
	}
	}

	static void __devinit am200_init_gpio_pin(int pin, int dir)
	{
	u8 index;
	/* dir 0 is output, 1 is input
	- do 2 things here:
	- set gpio alternate function to standard gpio
	- set gpio direction to input or output */

	index = pin >> 4;
	switch (index) {
	case 1:
	GAFR0_U &= ~(AF_SEL_GPIO_N << GAFR0_U_OFFSET(pin));

	if (dir)
	GPDR0 &= ~(1 << pin);
	else
	GPDR0 \|= (1 << pin);
	break;
	case 2:
	GAFR1_L &= ~(AF_SEL_GPIO_N << GAFR1_L_OFFSET(pin));

	if (dir)
	GPDR1 &= ~(1 << GPDR1_OFFSET(pin));
	else
	GPDR1 \|= (1 << GPDR1_OFFSET(pin));
	break;
	case 3:
	GAFR1_U &= ~(AF_SEL_GPIO_N << GAFR1_U_OFFSET(pin));

	if (dir)
	GPDR1 &= ~(1 << GPDR1_OFFSET(pin));
	else
	GPDR1 \|= (1 << GPDR1_OFFSET(pin));
	break;
	default:
	printk(KERN_ERR "unimplemented\n");
	}
	}

	static void am200_init_gpio_regs(struct metronomefb_par *par)
	{
	am200_init_gpio_pin(LED_GPIO_PIN, 0);
	am200_set_gpio_output(LED_GPIO_PIN, 0);

	am200_init_gpio_pin(STDBY_GPIO_PIN, 0);
	am200_set_gpio_output(STDBY_GPIO_PIN, 0);

	am200_init_gpio_pin(RST_GPIO_PIN, 0);
	am200_set_gpio_output(RST_GPIO_PIN, 0);

	am200_init_gpio_pin(RDY_GPIO_PIN, 1);

	am200_init_gpio_pin(ERR_GPIO_PIN, 1);

	am200_init_gpio_pin(PCBPWR_GPIO_PIN, 0);
	am200_set_gpio_output(PCBPWR_GPIO_PIN, 0);
	}

	static void am200_disable_lcd_controller(struct metronomefb_par *par)
	{
	LCSR = 0xffffffff; /* Clear LCD Status Register */
	LCCR0 \|= LCCR0_DIS; /* Disable LCD Controller */

	/* we reset and just wait for things to settle */
	msleep(200);
	}

	static void am200_enable_lcd_controller(struct metronomefb_par *par)
	{
	LCSR = 0xffffffff;
	FDADR0 = par->metromem_desc_dma;
	LCCR0 \|= LCCR0_ENB;
	}

	static void am200_init_lcdc_regs(struct metronomefb_par *par)
	{
	/* here we do:
	- disable the lcd controller
	- setup lcd control registers
	- setup dma descriptor
	- reenable lcd controller
	*/

	/* disable the lcd controller */
	am200_disable_lcd_controller(par);

	/* setup lcd control registers */
	LCCR0 = LCCR0_LDM \| LCCR0_SFM \| LCCR0_IUM \| LCCR0_EFM \| LCCR0_PAS
	\| LCCR0_QDM \| LCCR0_BM \| LCCR0_OUM;

	LCCR1 = (par->info->var.xres/2 - 1) /* pixels per line */
	\| (27 << 10) /* hsync pulse width - 1 */
	\| (33 << 16) /* eol pixel count */
	\| (33 << 24); /* bol pixel count */

	LCCR2 = (par->info->var.yres - 1) /* lines per panel */
	\| (24 << 10) /* vsync pulse width - 1 */
	\| (2 << 16) /* eof pixel count */
	\| (0 << 24); /* bof pixel count */

	LCCR3 = 2 /* pixel clock divisor */
	\| (24 << 8) /* AC Bias pin freq */
	\| LCCR3_16BPP /* BPP */
	\| LCCR3_PCP; /* PCP falling edge */

	}

	static void am200_post_dma_setup(struct metronomefb_par *par)
	{
	par->metromem_desc->mFDADR0 = par->metromem_desc_dma;
	par->metromem_desc->mFSADR0 = par->metromem_dma;
	par->metromem_desc->mFIDR0 = 0;
	par->metromem_desc->mLDCMD0 = par->info->var.xres
	* par->info->var.yres;
	am200_enable_lcd_controller(par);
	}

	static void am200_free_irq(struct fb_info *info)
	{
	free_irq(IRQ_GPIO(RDY_GPIO_PIN), info);
	}

	static irqreturn_t am200_handle_irq(int irq, void *dev_id)
	{
	struct fb_info *info = dev_id;
	struct metronomefb_par *par = info->par;

	wake_up_interruptible(&par->waitq);
	return IRQ_HANDLED;
	}

	static int am200_setup_irq(struct fb_info *info)
	{
	int retval;

	retval = request_irq(IRQ_GPIO(RDY_GPIO_PIN), am200_handle_irq,
	IRQF_DISABLED, "AM200", info);
	if (retval) {
	printk(KERN_ERR "am200epd: request_irq failed: %d\n", retval);
	return retval;
	}

	return set_irq_type(IRQ_GPIO(RDY_GPIO_PIN), IRQT_FALLING);
	}

	static void am200_set_rst(struct metronomefb_par *par, int state)
	{
	am200_set_gpio_output(RST_GPIO_PIN, state);
	}

	static void am200_set_stdby(struct metronomefb_par *par, int state)
	{
	am200_set_gpio_output(STDBY_GPIO_PIN, state);
	}

	static int am200_wait_event(struct metronomefb_par *par)
	{
	return wait_event_timeout(par->waitq, (GPLR1 & 0x01), HZ);
	}

	static int am200_wait_event_intr(struct metronomefb_par *par)
	{
	return wait_event_interruptible_timeout(par->waitq, (GPLR1 & 0x01), HZ);
	}

	static struct metronome_board am200_board = {
	.owner = THIS_MODULE,
	.free_irq = am200_free_irq,
	.setup_irq = am200_setup_irq,
	.init_gpio_regs = am200_init_gpio_regs,
	.init_lcdc_regs = am200_init_lcdc_regs,
	.post_dma_setup = am200_post_dma_setup,
	.set_rst = am200_set_rst,
	.set_stdby = am200_set_stdby,
	.met_wait_event = am200_wait_event,
	.met_wait_event_intr = am200_wait_event_intr,
	};

	static struct platform_device *am200_device;

	static int __init am200_init(void)
	{
	int ret;

	/* request our platform independent driver */
	request_module("metronomefb");

	am200_device = platform_device_alloc("metronomefb", -1);
	if (!am200_device)
	return -ENOMEM;

	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);

	return ret;
	}

	static void __exit am200_exit(void)
	{
	platform_device_unregister(am200_device);
	}

	module_init(am200_init);
	module_exit(am200_exit);

	MODULE_DESCRIPTION("board driver for am200 metronome epd kit");
	MODULE_AUTHOR("Jaya Kumar");
	MODULE_LICENSE("GPL");