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395 lines
9.8 KiB
395 lines
9.8 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 "pxa25x.h" |
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#include "gumstix.h" |
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#include <linux/platform_data/video-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(PXA_GPIO_TO_IRQ(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(PXA_GPIO_TO_IRQ(RDY_GPIO_PIN), am200_handle_irq, |
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IRQF_TRIGGER_FALLING, "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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/* |
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* Before anything else, we request notification for any fb |
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* creation events. |
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* |
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* FIXME: This is terrible and needs to be nuked. The notifier is used |
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* to get at the fb base address from the boot splash fb driver, which |
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* is then passed to metronomefb. Instaed of metronomfb or this board |
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* support file here figuring this out on their own. |
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* |
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* See also the #ifdef in fbmem.c. |
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*/ |
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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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