arch/arm/mach-pxa/am200epd.c - kernel/msm-4.19 - Gitiles

 /*
  * 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");
	/*
	* 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");