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387 lines
9.4 KiB
387 lines
9.4 KiB
/*
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* am200epd.c -- Platform device for AM200 EPD kit
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*
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* Copyright (C) 2008, Jaya Kumar
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*
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* Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
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*
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* This work was made possible by help and equipment support from E-Ink
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* Corporation. http://support.eink.com/community
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*
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* This driver is written to be used with the Metronome display controller.
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* on the AM200 EPD prototype kit/development kit with an E-Ink 800x600
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* Vizplex EPD on a Gumstix board using the Lyre interface board.
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/irq.h>
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#include <linux/gpio.h>
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#include <mach/pxa25x.h>
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#include <mach/gumstix.h>
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#include <mach/pxafb.h>
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#include "generic.h"
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#include <video/metronomefb.h>
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static unsigned int panel_type = 6;
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static struct platform_device *am200_device;
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static struct metronome_board am200_board;
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static struct pxafb_mode_info am200_fb_mode_9inch7 = {
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.pixclock = 40000,
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.xres = 1200,
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.yres = 842,
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.bpp = 16,
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.hsync_len = 2,
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.left_margin = 2,
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.right_margin = 2,
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.vsync_len = 1,
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.upper_margin = 2,
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.lower_margin = 25,
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.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
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};
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static struct pxafb_mode_info am200_fb_mode_8inch = {
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.pixclock = 40000,
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.xres = 1088,
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.yres = 791,
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.bpp = 16,
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.hsync_len = 28,
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.left_margin = 8,
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.right_margin = 30,
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.vsync_len = 8,
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.upper_margin = 10,
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.lower_margin = 8,
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.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
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};
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static struct pxafb_mode_info am200_fb_mode_6inch = {
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.pixclock = 40189,
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.xres = 832,
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.yres = 622,
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.bpp = 16,
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.hsync_len = 28,
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.left_margin = 34,
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.right_margin = 34,
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.vsync_len = 25,
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.upper_margin = 0,
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.lower_margin = 2,
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.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
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};
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static struct pxafb_mach_info am200_fb_info = {
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.modes = &am200_fb_mode_6inch,
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.num_modes = 1,
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.lcd_conn = LCD_TYPE_COLOR_TFT | LCD_PCLK_EDGE_FALL |
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LCD_AC_BIAS_FREQ(24),
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};
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/* register offsets for gpio control */
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#define LED_GPIO_PIN 51
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#define STDBY_GPIO_PIN 48
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#define RST_GPIO_PIN 49
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#define RDY_GPIO_PIN 32
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#define ERR_GPIO_PIN 17
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#define PCBPWR_GPIO_PIN 16
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static int gpios[] = { LED_GPIO_PIN , STDBY_GPIO_PIN , RST_GPIO_PIN,
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RDY_GPIO_PIN, ERR_GPIO_PIN, PCBPWR_GPIO_PIN };
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static char *gpio_names[] = { "LED" , "STDBY" , "RST", "RDY", "ERR", "PCBPWR" };
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static int am200_init_gpio_regs(struct metronomefb_par *par)
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{
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int i;
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int err;
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for (i = 0; i < ARRAY_SIZE(gpios); i++) {
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err = gpio_request(gpios[i], gpio_names[i]);
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if (err) {
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dev_err(&am200_device->dev, "failed requesting "
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"gpio %s, err=%d\n", gpio_names[i], err);
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goto err_req_gpio;
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}
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}
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gpio_direction_output(LED_GPIO_PIN, 0);
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gpio_direction_output(STDBY_GPIO_PIN, 0);
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gpio_direction_output(RST_GPIO_PIN, 0);
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gpio_direction_input(RDY_GPIO_PIN);
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gpio_direction_input(ERR_GPIO_PIN);
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gpio_direction_output(PCBPWR_GPIO_PIN, 0);
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return 0;
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err_req_gpio:
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while (--i >= 0)
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gpio_free(gpios[i]);
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return err;
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}
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static void am200_cleanup(struct metronomefb_par *par)
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{
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int i;
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free_irq(IRQ_GPIO(RDY_GPIO_PIN), par);
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for (i = 0; i < ARRAY_SIZE(gpios); i++)
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gpio_free(gpios[i]);
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}
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static int am200_share_video_mem(struct fb_info *info)
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{
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/* rough check if this is our desired fb and not something else */
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if ((info->var.xres != am200_fb_info.modes->xres)
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|| (info->var.yres != am200_fb_info.modes->yres))
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return 0;
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/* we've now been notified that we have our new fb */
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am200_board.metromem = info->screen_base;
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am200_board.host_fbinfo = info;
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/* try to refcount host drv since we are the consumer after this */
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if (!try_module_get(info->fbops->owner))
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return -ENODEV;
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return 0;
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}
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static int am200_unshare_video_mem(struct fb_info *info)
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{
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dev_dbg(&am200_device->dev, "ENTER %s\n", __func__);
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if (info != am200_board.host_fbinfo)
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return 0;
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module_put(am200_board.host_fbinfo->fbops->owner);
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return 0;
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}
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static int am200_fb_notifier_callback(struct notifier_block *self,
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unsigned long event, void *data)
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{
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struct fb_event *evdata = data;
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struct fb_info *info = evdata->info;
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dev_dbg(&am200_device->dev, "ENTER %s\n", __func__);
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if (event == FB_EVENT_FB_REGISTERED)
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return am200_share_video_mem(info);
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else if (event == FB_EVENT_FB_UNREGISTERED)
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return am200_unshare_video_mem(info);
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return 0;
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}
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static struct notifier_block am200_fb_notif = {
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.notifier_call = am200_fb_notifier_callback,
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};
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/* this gets called as part of our init. these steps must be done now so
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* that we can use pxa_set_fb_info */
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static void __init am200_presetup_fb(void)
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{
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int fw;
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int fh;
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int padding_size;
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int totalsize;
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switch (panel_type) {
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case 6:
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am200_fb_info.modes = &am200_fb_mode_6inch;
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break;
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case 8:
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am200_fb_info.modes = &am200_fb_mode_8inch;
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break;
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case 97:
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am200_fb_info.modes = &am200_fb_mode_9inch7;
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break;
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default:
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dev_err(&am200_device->dev, "invalid panel_type selection,"
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" setting to 6\n");
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am200_fb_info.modes = &am200_fb_mode_6inch;
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break;
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}
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/* the frame buffer is divided as follows:
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command | CRC | padding
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16kb waveform data | CRC | padding
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image data | CRC
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*/
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fw = am200_fb_info.modes->xres;
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fh = am200_fb_info.modes->yres;
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/* waveform must be 16k + 2 for checksum */
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am200_board.wfm_size = roundup(16*1024 + 2, fw);
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padding_size = PAGE_SIZE + (4 * fw);
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/* total is 1 cmd , 1 wfm, padding and image */
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totalsize = fw + am200_board.wfm_size + padding_size + (fw*fh);
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/* save this off because we're manipulating fw after this and
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* we'll need it when we're ready to setup the framebuffer */
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am200_board.fw = fw;
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am200_board.fh = fh;
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/* the reason we do this adjustment is because we want to acquire
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* more framebuffer memory without imposing custom awareness on the
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* underlying pxafb driver */
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am200_fb_info.modes->yres = DIV_ROUND_UP(totalsize, fw);
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/* we divide since we told the LCD controller we're 16bpp */
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am200_fb_info.modes->xres /= 2;
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pxa_set_fb_info(NULL, &am200_fb_info);
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}
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/* this gets called by metronomefb as part of its init, in our case, we
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* have already completed initial framebuffer init in presetup_fb so we
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* can just setup the fb access pointers */
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static int am200_setup_fb(struct metronomefb_par *par)
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{
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int fw;
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int fh;
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fw = am200_board.fw;
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fh = am200_board.fh;
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/* metromem was set up by the notifier in share_video_mem so now
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* we can use its value to calculate the other entries */
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par->metromem_cmd = (struct metromem_cmd *) am200_board.metromem;
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par->metromem_wfm = am200_board.metromem + fw;
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par->metromem_img = par->metromem_wfm + am200_board.wfm_size;
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par->metromem_img_csum = (u16 *) (par->metromem_img + (fw * fh));
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par->metromem_dma = am200_board.host_fbinfo->fix.smem_start;
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return 0;
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}
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static int am200_get_panel_type(void)
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{
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return panel_type;
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}
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static irqreturn_t am200_handle_irq(int irq, void *dev_id)
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{
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struct metronomefb_par *par = dev_id;
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wake_up_interruptible(&par->waitq);
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return IRQ_HANDLED;
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}
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static int am200_setup_irq(struct fb_info *info)
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{
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int ret;
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ret = request_irq(IRQ_GPIO(RDY_GPIO_PIN), am200_handle_irq,
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IRQF_DISABLED|IRQF_TRIGGER_FALLING,
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"AM200", info->par);
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if (ret)
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dev_err(&am200_device->dev, "request_irq failed: %d\n", ret);
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return ret;
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}
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static void am200_set_rst(struct metronomefb_par *par, int state)
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{
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gpio_set_value(RST_GPIO_PIN, state);
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}
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static void am200_set_stdby(struct metronomefb_par *par, int state)
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{
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gpio_set_value(STDBY_GPIO_PIN, state);
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}
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static int am200_wait_event(struct metronomefb_par *par)
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{
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return wait_event_timeout(par->waitq, gpio_get_value(RDY_GPIO_PIN), HZ);
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}
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static int am200_wait_event_intr(struct metronomefb_par *par)
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{
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return wait_event_interruptible_timeout(par->waitq,
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gpio_get_value(RDY_GPIO_PIN), HZ);
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}
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static struct metronome_board am200_board = {
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.owner = THIS_MODULE,
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.setup_irq = am200_setup_irq,
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.setup_io = am200_init_gpio_regs,
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.setup_fb = am200_setup_fb,
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.set_rst = am200_set_rst,
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.set_stdby = am200_set_stdby,
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.met_wait_event = am200_wait_event,
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.met_wait_event_intr = am200_wait_event_intr,
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.get_panel_type = am200_get_panel_type,
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.cleanup = am200_cleanup,
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};
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static unsigned long am200_pin_config[] __initdata = {
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GPIO51_GPIO,
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GPIO49_GPIO,
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GPIO48_GPIO,
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GPIO32_GPIO,
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GPIO17_GPIO,
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GPIO16_GPIO,
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};
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int __init am200_init(void)
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{
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int ret;
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/* before anything else, we request notification for any fb
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* creation events */
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fb_register_client(&am200_fb_notif);
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pxa2xx_mfp_config(ARRAY_AND_SIZE(am200_pin_config));
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/* request our platform independent driver */
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request_module("metronomefb");
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am200_device = platform_device_alloc("metronomefb", -1);
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if (!am200_device)
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return -ENOMEM;
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/* the am200_board that will be seen by metronomefb is a copy */
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platform_device_add_data(am200_device, &am200_board,
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sizeof(am200_board));
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/* this _add binds metronomefb to am200. metronomefb refcounts am200 */
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ret = platform_device_add(am200_device);
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if (ret) {
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platform_device_put(am200_device);
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fb_unregister_client(&am200_fb_notif);
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return ret;
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}
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am200_presetup_fb();
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return 0;
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}
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module_param(panel_type, uint, 0);
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MODULE_PARM_DESC(panel_type, "Select the panel type: 6, 8, 97");
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MODULE_DESCRIPTION("board driver for am200 metronome epd kit");
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MODULE_AUTHOR("Jaya Kumar");
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MODULE_LICENSE("GPL");
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