aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-pxa/am200epd.c
blob: fd61420545783b727599d43fc72fe5d6227f15db (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
/*
 * 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,
};

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_DESCRIPTION("board driver for am200 metronome epd kit");
MODULE_AUTHOR("Jaya Kumar");
MODULE_LICENSE("GPL");