[ARM] 5200/1: am200epd: use fb notifiers and gpio api (92261343) · Commits · 戴 / test

arch/arm/mach-pxa/Kconfig

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Original line number	Diff line number	Diff line
		@@ -256,6 +256,9 @@ config PCM990_DISPLAY_NONE

		endchoice

		config MACH_AM200EPD
		depends on MACH_GUMSTIX_F
		bool "Enable AM200EPD board support"

		config PXA_EZX
		bool "Motorola EZX Platform"

arch/arm/mach-pxa/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -22,6 +22,7 @@ obj-$(CONFIG_CPU_PXA930) += pxa930.o

		# Specific board support
		obj-$(CONFIG_ARCH_GUMSTIX) += gumstix.o
		obj-$(CONFIG_MACH_AM200EPD) += am200epd.o
		obj-$(CONFIG_ARCH_LUBBOCK) += lubbock.o
		obj-$(CONFIG_MACH_LOGICPD_PXA270) += lpd270.o
		obj-$(CONFIG_MACH_MAINSTONE) += mainstone.o

arch/arm/mach-pxa/am200epd.c

0 → 100644

+374 −0

Original line number	Diff line number	Diff line
		/*
		* 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");

drivers/video/Kconfig

+0 −13

Original line number	Diff line number	Diff line
		@@ -1969,19 +1969,6 @@ config FB_XILINX
		framebuffer. ML300 carries a 640*480 LCD display on the board,
		ML403 uses a standard DB15 VGA connector.

		config FB_AM200EPD
		tristate "AM-200 E-Ink EPD devkit support"
		depends on FB && ARCH_PXA && MMU
		select FB_SYS_FILLRECT
		select FB_SYS_COPYAREA
		select FB_SYS_IMAGEBLIT
		select FB_SYS_FOPS
		select FB_DEFERRED_IO
		select FB_METRONOME
		help
		This enables support for the Metronome display controller used on
		the E-Ink AM-200 EPD devkit.

		config FB_COBALT
		tristate "Cobalt server LCD frame buffer support"
		depends on FB && MIPS_COBALT

drivers/video/Makefile

+0 −1

Original line number	Diff line number	Diff line
		@@ -29,7 +29,6 @@ obj-$(CONFIG_FB_DEFERRED_IO) += fb_defio.o

		# Hardware specific drivers go first
		obj-$(CONFIG_FB_AMIGA) += amifb.o c2p.o
		obj-$(CONFIG_FB_AM200EPD) += am200epd.o
		obj-$(CONFIG_FB_ARC) += arcfb.o
		obj-$(CONFIG_FB_CLPS711X) += clps711xfb.o
		obj-$(CONFIG_FB_CYBER2000) += cyber2000fb.o

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