2 * am200epd.c -- Platform device for AM200 EPD kit
4 * Copyright (C) 2008, Jaya Kumar
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive for
10 * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
12 * This work was made possible by help and equipment support from E-Ink
13 * Corporation. http://support.eink.com/community
15 * This driver is written to be used with the Metronome display controller.
16 * on the AM200 EPD prototype kit/development kit with an E-Ink 800x600
17 * Vizplex EPD on a Gumstix board using the Lyre interface board.
21 #include <linux/module.h>
22 #include <linux/kernel.h>
23 #include <linux/errno.h>
24 #include <linux/string.h>
25 #include <linux/delay.h>
26 #include <linux/interrupt.h>
28 #include <linux/init.h>
29 #include <linux/platform_device.h>
30 #include <linux/irq.h>
31 #include <linux/gpio.h>
33 #include <mach/pxa25x.h>
34 #include <mach/gumstix.h>
35 #include <mach/pxafb.h>
39 #include <video/metronomefb.h>
41 static unsigned int panel_type = 6;
42 static struct platform_device *am200_device;
43 static struct metronome_board am200_board;
45 static struct pxafb_mode_info am200_fb_mode_9inch7 = {
56 .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
59 static struct pxafb_mode_info am200_fb_mode_8inch = {
70 .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
73 static struct pxafb_mode_info am200_fb_mode_6inch = {
84 .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
87 static struct pxafb_mach_info am200_fb_info = {
88 .modes = &am200_fb_mode_6inch,
90 .lcd_conn = LCD_TYPE_COLOR_TFT | LCD_PCLK_EDGE_FALL |
94 /* register offsets for gpio control */
95 #define LED_GPIO_PIN 51
96 #define STDBY_GPIO_PIN 48
97 #define RST_GPIO_PIN 49
98 #define RDY_GPIO_PIN 32
99 #define ERR_GPIO_PIN 17
100 #define PCBPWR_GPIO_PIN 16
101 static int gpios[] = { LED_GPIO_PIN , STDBY_GPIO_PIN , RST_GPIO_PIN,
102 RDY_GPIO_PIN, ERR_GPIO_PIN, PCBPWR_GPIO_PIN };
103 static char *gpio_names[] = { "LED" , "STDBY" , "RST", "RDY", "ERR", "PCBPWR" };
105 static int am200_init_gpio_regs(struct metronomefb_par *par)
110 for (i = 0; i < ARRAY_SIZE(gpios); i++) {
111 err = gpio_request(gpios[i], gpio_names[i]);
113 dev_err(&am200_device->dev, "failed requesting "
114 "gpio %s, err=%d\n", gpio_names[i], err);
119 gpio_direction_output(LED_GPIO_PIN, 0);
120 gpio_direction_output(STDBY_GPIO_PIN, 0);
121 gpio_direction_output(RST_GPIO_PIN, 0);
123 gpio_direction_input(RDY_GPIO_PIN);
124 gpio_direction_input(ERR_GPIO_PIN);
126 gpio_direction_output(PCBPWR_GPIO_PIN, 0);
137 static void am200_cleanup(struct metronomefb_par *par)
141 free_irq(IRQ_GPIO(RDY_GPIO_PIN), par);
143 for (i = 0; i < ARRAY_SIZE(gpios); i++)
147 static int am200_share_video_mem(struct fb_info *info)
149 /* rough check if this is our desired fb and not something else */
150 if ((info->var.xres != am200_fb_info.modes->xres)
151 || (info->var.yres != am200_fb_info.modes->yres))
154 /* we've now been notified that we have our new fb */
155 am200_board.metromem = info->screen_base;
156 am200_board.host_fbinfo = info;
158 /* try to refcount host drv since we are the consumer after this */
159 if (!try_module_get(info->fbops->owner))
165 static int am200_unshare_video_mem(struct fb_info *info)
167 dev_dbg(&am200_device->dev, "ENTER %s\n", __func__);
169 if (info != am200_board.host_fbinfo)
172 module_put(am200_board.host_fbinfo->fbops->owner);
176 static int am200_fb_notifier_callback(struct notifier_block *self,
177 unsigned long event, void *data)
179 struct fb_event *evdata = data;
180 struct fb_info *info = evdata->info;
182 dev_dbg(&am200_device->dev, "ENTER %s\n", __func__);
184 if (event == FB_EVENT_FB_REGISTERED)
185 return am200_share_video_mem(info);
186 else if (event == FB_EVENT_FB_UNREGISTERED)
187 return am200_unshare_video_mem(info);
192 static struct notifier_block am200_fb_notif = {
193 .notifier_call = am200_fb_notifier_callback,
196 /* this gets called as part of our init. these steps must be done now so
197 * that we can use pxa_set_fb_info */
198 static void __init am200_presetup_fb(void)
205 switch (panel_type) {
207 am200_fb_info.modes = &am200_fb_mode_6inch;
210 am200_fb_info.modes = &am200_fb_mode_8inch;
213 am200_fb_info.modes = &am200_fb_mode_9inch7;
216 dev_err(&am200_device->dev, "invalid panel_type selection,"
218 am200_fb_info.modes = &am200_fb_mode_6inch;
222 /* the frame buffer is divided as follows:
223 command | CRC | padding
224 16kb waveform data | CRC | padding
228 fw = am200_fb_info.modes->xres;
229 fh = am200_fb_info.modes->yres;
231 /* waveform must be 16k + 2 for checksum */
232 am200_board.wfm_size = roundup(16*1024 + 2, fw);
234 padding_size = PAGE_SIZE + (4 * fw);
236 /* total is 1 cmd , 1 wfm, padding and image */
237 totalsize = fw + am200_board.wfm_size + padding_size + (fw*fh);
239 /* save this off because we're manipulating fw after this and
240 * we'll need it when we're ready to setup the framebuffer */
244 /* the reason we do this adjustment is because we want to acquire
245 * more framebuffer memory without imposing custom awareness on the
246 * underlying pxafb driver */
247 am200_fb_info.modes->yres = DIV_ROUND_UP(totalsize, fw);
249 /* we divide since we told the LCD controller we're 16bpp */
250 am200_fb_info.modes->xres /= 2;
252 pxa_set_fb_info(NULL, &am200_fb_info);
256 /* this gets called by metronomefb as part of its init, in our case, we
257 * have already completed initial framebuffer init in presetup_fb so we
258 * can just setup the fb access pointers */
259 static int am200_setup_fb(struct metronomefb_par *par)
267 /* metromem was set up by the notifier in share_video_mem so now
268 * we can use its value to calculate the other entries */
269 par->metromem_cmd = (struct metromem_cmd *) am200_board.metromem;
270 par->metromem_wfm = am200_board.metromem + fw;
271 par->metromem_img = par->metromem_wfm + am200_board.wfm_size;
272 par->metromem_img_csum = (u16 *) (par->metromem_img + (fw * fh));
273 par->metromem_dma = am200_board.host_fbinfo->fix.smem_start;
278 static int am200_get_panel_type(void)
283 static irqreturn_t am200_handle_irq(int irq, void *dev_id)
285 struct metronomefb_par *par = dev_id;
287 wake_up_interruptible(&par->waitq);
291 static int am200_setup_irq(struct fb_info *info)
295 ret = request_irq(IRQ_GPIO(RDY_GPIO_PIN), am200_handle_irq,
296 IRQF_DISABLED|IRQF_TRIGGER_FALLING,
299 dev_err(&am200_device->dev, "request_irq failed: %d\n", ret);
304 static void am200_set_rst(struct metronomefb_par *par, int state)
306 gpio_set_value(RST_GPIO_PIN, state);
309 static void am200_set_stdby(struct metronomefb_par *par, int state)
311 gpio_set_value(STDBY_GPIO_PIN, state);
314 static int am200_wait_event(struct metronomefb_par *par)
316 return wait_event_timeout(par->waitq, gpio_get_value(RDY_GPIO_PIN), HZ);
319 static int am200_wait_event_intr(struct metronomefb_par *par)
321 return wait_event_interruptible_timeout(par->waitq,
322 gpio_get_value(RDY_GPIO_PIN), HZ);
325 static struct metronome_board am200_board = {
326 .owner = THIS_MODULE,
327 .setup_irq = am200_setup_irq,
328 .setup_io = am200_init_gpio_regs,
329 .setup_fb = am200_setup_fb,
330 .set_rst = am200_set_rst,
331 .set_stdby = am200_set_stdby,
332 .met_wait_event = am200_wait_event,
333 .met_wait_event_intr = am200_wait_event_intr,
334 .get_panel_type = am200_get_panel_type,
335 .cleanup = am200_cleanup,
338 static unsigned long am200_pin_config[] __initdata = {
347 int __init am200_init(void)
351 /* before anything else, we request notification for any fb
353 fb_register_client(&am200_fb_notif);
355 pxa2xx_mfp_config(ARRAY_AND_SIZE(am200_pin_config));
357 /* request our platform independent driver */
358 request_module("metronomefb");
360 am200_device = platform_device_alloc("metronomefb", -1);
364 /* the am200_board that will be seen by metronomefb is a copy */
365 platform_device_add_data(am200_device, &am200_board,
366 sizeof(am200_board));
368 /* this _add binds metronomefb to am200. metronomefb refcounts am200 */
369 ret = platform_device_add(am200_device);
372 platform_device_put(am200_device);
373 fb_unregister_client(&am200_fb_notif);
382 module_param(panel_type, uint, 0);
383 MODULE_PARM_DESC(panel_type, "Select the panel type: 6, 8, 97");
385 MODULE_DESCRIPTION("board driver for am200 metronome epd kit");
386 MODULE_AUTHOR("Jaya Kumar");
387 MODULE_LICENSE("GPL");