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
41 static unsigned int panel_type = 6;
42 static struct platform_device *am200_device;
43 static struct metronome_board am200_board;
44
45 static 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
59 static 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
73 static 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
87 static 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
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" };
104
am200_init_gpio_regs(struct metronomefb_par * par)105 static 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(gpios[i], 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, 0);
120 gpio_direction_output(STDBY_GPIO_PIN, 0);
121 gpio_direction_output(RST_GPIO_PIN, 0);
122
123 gpio_direction_input(RDY_GPIO_PIN);
124 gpio_direction_input(ERR_GPIO_PIN);
125
126 gpio_direction_output(PCBPWR_GPIO_PIN, 0);
127
128 return 0;
129
130 err_req_gpio:
131 while (--i >= 0)
132 gpio_free(gpios[i]);
133
134 return err;
135 }
136
am200_cleanup(struct metronomefb_par * par)137 static 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(gpios[i]);
145 }
146
am200_share_video_mem(struct fb_info * info)147 static 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(info->fbops->owner))
160 return -ENODEV;
161
162 return 0;
163 }
164
am200_unshare_video_mem(struct fb_info * info)165 static 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(am200_board.host_fbinfo->fbops->owner);
173 return 0;
174 }
175
am200_fb_notifier_callback(struct notifier_block * self,unsigned long event,void * data)176 static 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
192 static 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 */
am200_presetup_fb(void)198 static 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 */
am200_setup_fb(struct metronomefb_par * par)259 static 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
am200_get_panel_type(void)278 static int am200_get_panel_type(void)
279 {
280 return panel_type;
281 }
282
am200_handle_irq(int irq,void * dev_id)283 static 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
am200_setup_irq(struct fb_info * info)291 static int am200_setup_irq(struct fb_info *info)
292 {
293 int ret;
294
295 ret = request_irq(PXA_GPIO_TO_IRQ(RDY_GPIO_PIN), am200_handle_irq,
296 IRQF_TRIGGER_FALLING, "AM200", info->par);
297 if (ret)
298 dev_err(&am200_device->dev, "request_irq failed: %d\n", ret);
299
300 return ret;
301 }
302
am200_set_rst(struct metronomefb_par * par,int state)303 static void am200_set_rst(struct metronomefb_par *par, int state)
304 {
305 gpio_set_value(RST_GPIO_PIN, state);
306 }
307
am200_set_stdby(struct metronomefb_par * par,int state)308 static void am200_set_stdby(struct metronomefb_par *par, int state)
309 {
310 gpio_set_value(STDBY_GPIO_PIN, state);
311 }
312
am200_wait_event(struct metronomefb_par * par)313 static 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
am200_wait_event_intr(struct metronomefb_par * par)318 static 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
324 static 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
337 static 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
am200_init(void)346 int __init am200_init(void)
347 {
348 int ret;
349
350 /* before anything else, we request notification for any fb
351 * creation events */
352 fb_register_client(&am200_fb_notif);
353
354 pxa2xx_mfp_config(ARRAY_AND_SIZE(am200_pin_config));
355
356 /* request our platform independent driver */
357 request_module("metronomefb");
358
359 am200_device = platform_device_alloc("metronomefb", -1);
360 if (!am200_device)
361 return -ENOMEM;
362
363 /* the am200_board that will be seen by metronomefb is a copy */
364 platform_device_add_data(am200_device, &am200_board,
365 sizeof(am200_board));
366
367 /* this _add binds metronomefb to am200. metronomefb refcounts am200 */
368 ret = platform_device_add(am200_device);
369
370 if (ret) {
371 platform_device_put(am200_device);
372 fb_unregister_client(&am200_fb_notif);
373 return ret;
374 }
375
376 am200_presetup_fb();
377
378 return 0;
379 }
380
381 module_param(panel_type, uint, 0);
382 MODULE_PARM_DESC(panel_type, "Select the panel type: 6, 8, 97");
383
384 MODULE_DESCRIPTION("board driver for am200 metronome epd kit");
385 MODULE_AUTHOR("Jaya Kumar");
386 MODULE_LICENSE("GPL");
387
