1/*
2 * am200epd.c -- Platform device for AM200 EPD kit
3 *
4 * Copyright (C) 2008, Jaya Kumar
5 *
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
8 * more details.
9 *
10 * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
11 *
12 * This work was made possible by help and equipment support from E-Ink
13 * Corporation. http://support.eink.com/community
14 *
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.
18 *
19 */
20
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>
27#include <linux/fb.h>
28#include <linux/init.h>
29#include <linux/platform_device.h>
30#include <linux/irq.h>
31#include <linux/gpio.h>
32
33#include "pxa25x.h"
34#include "gumstix.h"
35#include <linux/platform_data/video-pxafb.h>
36
37#include "generic.h"
38
39#include <video/metronomefb.h>
40
41static unsigned int panel_type = 6;
42static struct platform_device *am200_device;
43static struct metronome_board am200_board;
44
45static struct pxafb_mode_info am200_fb_mode_9inch7 = {
46 .pixclock = 40000,
47 .xres = 1200,
48 .yres = 842,
49 .bpp = 16,
50 .hsync_len = 2,
51 .left_margin = 2,
52 .right_margin = 2,
53 .vsync_len = 1,
54 .upper_margin = 2,
55 .lower_margin = 25,
56 .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
57};
58
59static struct pxafb_mode_info am200_fb_mode_8inch = {
60 .pixclock = 40000,
61 .xres = 1088,
62 .yres = 791,
63 .bpp = 16,
64 .hsync_len = 28,
65 .left_margin = 8,
66 .right_margin = 30,
67 .vsync_len = 8,
68 .upper_margin = 10,
69 .lower_margin = 8,
70 .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
71};
72
73static struct pxafb_mode_info am200_fb_mode_6inch = {
74 .pixclock = 40189,
75 .xres = 832,
76 .yres = 622,
77 .bpp = 16,
78 .hsync_len = 28,
79 .left_margin = 34,
80 .right_margin = 34,
81 .vsync_len = 25,
82 .upper_margin = 0,
83 .lower_margin = 2,
84 .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
85};
86
87static struct pxafb_mach_info am200_fb_info = {
88 .modes = &am200_fb_mode_6inch,
89 .num_modes = 1,
90 .lcd_conn = LCD_TYPE_COLOR_TFT | LCD_PCLK_EDGE_FALL |
91 LCD_AC_BIAS_FREQ(24),
92};
93
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
101static int gpios[] = { LED_GPIO_PIN , STDBY_GPIO_PIN , RST_GPIO_PIN,
102 RDY_GPIO_PIN, ERR_GPIO_PIN, PCBPWR_GPIO_PIN };
103static char *gpio_names[] = { "LED" , "STDBY" , "RST", "RDY", "ERR", "PCBPWR" };
104
105static int am200_init_gpio_regs(struct metronomefb_par *par)
106{
107 int i;
108 int err;
109
110 for (i = 0; i < ARRAY_SIZE(gpios); i++) {
111 err = gpio_request(gpio: gpios[i], label: gpio_names[i]);
112 if (err) {
113 dev_err(&am200_device->dev, "failed requesting "
114 "gpio %s, err=%d\n", gpio_names[i], err);
115 goto err_req_gpio;
116 }
117 }
118
119 gpio_direction_output(LED_GPIO_PIN, value: 0);
120 gpio_direction_output(STDBY_GPIO_PIN, value: 0);
121 gpio_direction_output(RST_GPIO_PIN, value: 0);
122
123 gpio_direction_input(RDY_GPIO_PIN);
124 gpio_direction_input(ERR_GPIO_PIN);
125
126 gpio_direction_output(PCBPWR_GPIO_PIN, value: 0);
127
128 return 0;
129
130err_req_gpio:
131 while (--i >= 0)
132 gpio_free(gpio: gpios[i]);
133
134 return err;
135}
136
137static void am200_cleanup(struct metronomefb_par *par)
138{
139 int i;
140
141 free_irq(PXA_GPIO_TO_IRQ(RDY_GPIO_PIN), par);
142
143 for (i = 0; i < ARRAY_SIZE(gpios); i++)
144 gpio_free(gpio: gpios[i]);
145}
146
147static int am200_share_video_mem(struct fb_info *info)
148{
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))
152 return 0;
153
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;
157
158 /* try to refcount host drv since we are the consumer after this */
159 if (!try_module_get(module: info->fbops->owner))
160 return -ENODEV;
161
162 return 0;
163}
164
165static int am200_unshare_video_mem(struct fb_info *info)
166{
167 dev_dbg(&am200_device->dev, "ENTER %s\n", __func__);
168
169 if (info != am200_board.host_fbinfo)
170 return 0;
171
172 module_put(module: am200_board.host_fbinfo->fbops->owner);
173 return 0;
174}
175
176static int am200_fb_notifier_callback(struct notifier_block *self,
177 unsigned long event, void *data)
178{
179 struct fb_event *evdata = data;
180 struct fb_info *info = evdata->info;
181
182 dev_dbg(&am200_device->dev, "ENTER %s\n", __func__);
183
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);
188
189 return 0;
190}
191
192static struct notifier_block am200_fb_notif = {
193 .notifier_call = am200_fb_notifier_callback,
194};
195
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 */
198static void __init am200_presetup_fb(void)
199{
200 int fw;
201 int fh;
202 int padding_size;
203 int totalsize;
204
205 switch (panel_type) {
206 case 6:
207 am200_fb_info.modes = &am200_fb_mode_6inch;
208 break;
209 case 8:
210 am200_fb_info.modes = &am200_fb_mode_8inch;
211 break;
212 case 97:
213 am200_fb_info.modes = &am200_fb_mode_9inch7;
214 break;
215 default:
216 dev_err(&am200_device->dev, "invalid panel_type selection,"
217 " setting to 6\n");
218 am200_fb_info.modes = &am200_fb_mode_6inch;
219 break;
220 }
221
222 /* the frame buffer is divided as follows:
223 command | CRC | padding
224 16kb waveform data | CRC | padding
225 image data | CRC
226 */
227
228 fw = am200_fb_info.modes->xres;
229 fh = am200_fb_info.modes->yres;
230
231 /* waveform must be 16k + 2 for checksum */
232 am200_board.wfm_size = roundup(16*1024 + 2, fw);
233
234 padding_size = PAGE_SIZE + (4 * fw);
235
236 /* total is 1 cmd , 1 wfm, padding and image */
237 totalsize = fw + am200_board.wfm_size + padding_size + (fw*fh);
238
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 */
241 am200_board.fw = fw;
242 am200_board.fh = fh;
243
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);
248
249 /* we divide since we told the LCD controller we're 16bpp */
250 am200_fb_info.modes->xres /= 2;
251
252 pxa_set_fb_info(NULL, &am200_fb_info);
253
254}
255
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 */
259static int am200_setup_fb(struct metronomefb_par *par)
260{
261 int fw;
262 int fh;
263
264 fw = am200_board.fw;
265 fh = am200_board.fh;
266
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;
274
275 return 0;
276}
277
278static int am200_get_panel_type(void)
279{
280 return panel_type;
281}
282
283static irqreturn_t am200_handle_irq(int irq, void *dev_id)
284{
285 struct metronomefb_par *par = dev_id;
286
287 wake_up_interruptible(&par->waitq);
288 return IRQ_HANDLED;
289}
290
291static int am200_setup_irq(struct fb_info *info)
292{
293 int ret;
294
295 ret = request_irq(PXA_GPIO_TO_IRQ(RDY_GPIO_PIN), handler: am200_handle_irq,
296 IRQF_TRIGGER_FALLING, name: "AM200", dev: info->par);
297 if (ret)
298 dev_err(&am200_device->dev, "request_irq failed: %d\n", ret);
299
300 return ret;
301}
302
303static void am200_set_rst(struct metronomefb_par *par, int state)
304{
305 gpio_set_value(RST_GPIO_PIN, value: state);
306}
307
308static void am200_set_stdby(struct metronomefb_par *par, int state)
309{
310 gpio_set_value(STDBY_GPIO_PIN, value: state);
311}
312
313static int am200_wait_event(struct metronomefb_par *par)
314{
315 return wait_event_timeout(par->waitq, gpio_get_value(RDY_GPIO_PIN), HZ);
316}
317
318static int am200_wait_event_intr(struct metronomefb_par *par)
319{
320 return wait_event_interruptible_timeout(par->waitq,
321 gpio_get_value(RDY_GPIO_PIN), HZ);
322}
323
324static struct metronome_board am200_board = {
325 .owner = THIS_MODULE,
326 .setup_irq = am200_setup_irq,
327 .setup_io = am200_init_gpio_regs,
328 .setup_fb = am200_setup_fb,
329 .set_rst = am200_set_rst,
330 .set_stdby = am200_set_stdby,
331 .met_wait_event = am200_wait_event,
332 .met_wait_event_intr = am200_wait_event_intr,
333 .get_panel_type = am200_get_panel_type,
334 .cleanup = am200_cleanup,
335};
336
337static unsigned long am200_pin_config[] __initdata = {
338 GPIO51_GPIO,
339 GPIO49_GPIO,
340 GPIO48_GPIO,
341 GPIO32_GPIO,
342 GPIO17_GPIO,
343 GPIO16_GPIO,
344};
345
346int __init am200_init(void)
347{
348 int ret;
349
350 /*
351 * Before anything else, we request notification for any fb
352 * creation events.
353 *
354 * FIXME: This is terrible and needs to be nuked. The notifier is used
355 * to get at the fb base address from the boot splash fb driver, which
356 * is then passed to metronomefb. Instaed of metronomfb or this board
357 * support file here figuring this out on their own.
358 *
359 * See also the #ifdef in fbmem.c.
360 */
361 fb_register_client(nb: &am200_fb_notif);
362
363 pxa2xx_mfp_config(ARRAY_AND_SIZE(am200_pin_config));
364
365 /* request our platform independent driver */
366 request_module("metronomefb");
367
368 am200_device = platform_device_alloc(name: "metronomefb", id: -1);
369 if (!am200_device)
370 return -ENOMEM;
371
372 /* the am200_board that will be seen by metronomefb is a copy */
373 platform_device_add_data(pdev: am200_device, data: &am200_board,
374 size: sizeof(am200_board));
375
376 /* this _add binds metronomefb to am200. metronomefb refcounts am200 */
377 ret = platform_device_add(pdev: am200_device);
378
379 if (ret) {
380 platform_device_put(pdev: am200_device);
381 fb_unregister_client(nb: &am200_fb_notif);
382 return ret;
383 }
384
385 am200_presetup_fb();
386
387 return 0;
388}
389
390module_param(panel_type, uint, 0);
391MODULE_PARM_DESC(panel_type, "Select the panel type: 6, 8, 97");
392
393MODULE_DESCRIPTION("board driver for am200 metronome epd kit");
394MODULE_AUTHOR("Jaya Kumar");
395MODULE_LICENSE("GPL");
396

source code of linux/arch/arm/mach-pxa/am200epd.c