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1 | /* |
2 | * linux/drivers/video/hecubafb.c -- FB driver for Hecuba/Apollo controller |
3 | * |
4 | * Copyright (C) 2006, Jaya Kumar |
5 | * This work was sponsored by CIS(M) Sdn Bhd |
6 | * |
7 | * This file is subject to the terms and conditions of the GNU General Public |
8 | * License. See the file COPYING in the main directory of this archive for |
9 | * more details. |
10 | * |
11 | * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven. |
12 | * This work was possible because of apollo display code from E-Ink's website |
13 | * http://support.eink.com/community |
14 | * All information used to write this code is from public material made |
15 | * available by E-Ink on its support site. Some commands such as 0xA4 |
16 | * were found by looping through cmd=0x00 thru 0xFF and supplying random |
17 | * values. There are other commands that the display is capable of, |
18 | * beyond the 5 used here but they are more complex. |
19 | * |
20 | * This driver is written to be used with the Hecuba display architecture. |
21 | * The actual display chip is called Apollo and the interface electronics |
22 | * it needs is called Hecuba. |
23 | * |
24 | * It is intended to be architecture independent. A board specific driver |
25 | * must be used to perform all the physical IO interactions. An example |
26 | * is provided as n411.c |
27 | * |
28 | */ |
29 | |
30 | #include <linux/module.h> |
31 | #include <linux/kernel.h> |
32 | #include <linux/errno.h> |
33 | #include <linux/string.h> |
34 | #include <linux/mm.h> |
35 | #include <linux/slab.h> |
36 | #include <linux/vmalloc.h> |
37 | #include <linux/delay.h> |
38 | #include <linux/interrupt.h> |
39 | #include <linux/fb.h> |
40 | #include <linux/init.h> |
41 | #include <linux/platform_device.h> |
42 | #include <linux/list.h> |
43 | #include <linux/uaccess.h> |
44 | |
45 | #include <video/hecubafb.h> |
46 | |
47 | /* Display specific information */ |
48 | #define DPY_W 600 |
49 | #define DPY_H 800 |
50 | |
51 | static struct fb_fix_screeninfo hecubafb_fix __devinitdata = { |
52 | .id = "hecubafb", |
53 | .type = FB_TYPE_PACKED_PIXELS, |
54 | .visual = FB_VISUAL_MONO01, |
55 | .xpanstep = 0, |
56 | .ypanstep = 0, |
57 | .ywrapstep = 0, |
58 | .line_length = DPY_W, |
59 | .accel = FB_ACCEL_NONE, |
60 | }; |
61 | |
62 | static struct fb_var_screeninfo hecubafb_var __devinitdata = { |
63 | .xres = DPY_W, |
64 | .yres = DPY_H, |
65 | .xres_virtual = DPY_W, |
66 | .yres_virtual = DPY_H, |
67 | .bits_per_pixel = 1, |
68 | .nonstd = 1, |
69 | }; |
70 | |
71 | /* main hecubafb functions */ |
72 | |
73 | static void apollo_send_data(struct hecubafb_par *par, unsigned char data) |
74 | { |
75 | /* set data */ |
76 | par->board->set_data(par, data); |
77 | |
78 | /* set DS low */ |
79 | par->board->set_ctl(par, HCB_DS_BIT, 0); |
80 | |
81 | /* wait for ack */ |
82 | par->board->wait_for_ack(par, 0); |
83 | |
84 | /* set DS hi */ |
85 | par->board->set_ctl(par, HCB_DS_BIT, 1); |
86 | |
87 | /* wait for ack to clear */ |
88 | par->board->wait_for_ack(par, 1); |
89 | } |
90 | |
91 | static void apollo_send_command(struct hecubafb_par *par, unsigned char data) |
92 | { |
93 | /* command so set CD to high */ |
94 | par->board->set_ctl(par, HCB_CD_BIT, 1); |
95 | |
96 | /* actually strobe with command */ |
97 | apollo_send_data(par, data); |
98 | |
99 | /* clear CD back to low */ |
100 | par->board->set_ctl(par, HCB_CD_BIT, 0); |
101 | } |
102 | |
103 | static void hecubafb_dpy_update(struct hecubafb_par *par) |
104 | { |
105 | int i; |
106 | unsigned char *buf = (unsigned char __force *)par->info->screen_base; |
107 | |
108 | apollo_send_command(par, APOLLO_START_NEW_IMG); |
109 | |
110 | for (i=0; i < (DPY_W*DPY_H/8); i++) { |
111 | apollo_send_data(par, *(buf++)); |
112 | } |
113 | |
114 | apollo_send_command(par, APOLLO_STOP_IMG_DATA); |
115 | apollo_send_command(par, APOLLO_DISPLAY_IMG); |
116 | } |
117 | |
118 | /* this is called back from the deferred io workqueue */ |
119 | static void hecubafb_dpy_deferred_io(struct fb_info *info, |
120 | struct list_head *pagelist) |
121 | { |
122 | hecubafb_dpy_update(info->par); |
123 | } |
124 | |
125 | static void hecubafb_fillrect(struct fb_info *info, |
126 | const struct fb_fillrect *rect) |
127 | { |
128 | struct hecubafb_par *par = info->par; |
129 | |
130 | sys_fillrect(info, rect); |
131 | |
132 | hecubafb_dpy_update(par); |
133 | } |
134 | |
135 | static void hecubafb_copyarea(struct fb_info *info, |
136 | const struct fb_copyarea *area) |
137 | { |
138 | struct hecubafb_par *par = info->par; |
139 | |
140 | sys_copyarea(info, area); |
141 | |
142 | hecubafb_dpy_update(par); |
143 | } |
144 | |
145 | static void hecubafb_imageblit(struct fb_info *info, |
146 | const struct fb_image *image) |
147 | { |
148 | struct hecubafb_par *par = info->par; |
149 | |
150 | sys_imageblit(info, image); |
151 | |
152 | hecubafb_dpy_update(par); |
153 | } |
154 | |
155 | /* |
156 | * this is the slow path from userspace. they can seek and write to |
157 | * the fb. it's inefficient to do anything less than a full screen draw |
158 | */ |
159 | static ssize_t hecubafb_write(struct fb_info *info, const char __user *buf, |
160 | size_t count, loff_t *ppos) |
161 | { |
162 | struct hecubafb_par *par = info->par; |
163 | unsigned long p = *ppos; |
164 | void *dst; |
165 | int err = 0; |
166 | unsigned long total_size; |
167 | |
168 | if (info->state != FBINFO_STATE_RUNNING) |
169 | return -EPERM; |
170 | |
171 | total_size = info->fix.smem_len; |
172 | |
173 | if (p > total_size) |
174 | return -EFBIG; |
175 | |
176 | if (count > total_size) { |
177 | err = -EFBIG; |
178 | count = total_size; |
179 | } |
180 | |
181 | if (count + p > total_size) { |
182 | if (!err) |
183 | err = -ENOSPC; |
184 | |
185 | count = total_size - p; |
186 | } |
187 | |
188 | dst = (void __force *) (info->screen_base + p); |
189 | |
190 | if (copy_from_user(dst, buf, count)) |
191 | err = -EFAULT; |
192 | |
193 | if (!err) |
194 | *ppos += count; |
195 | |
196 | hecubafb_dpy_update(par); |
197 | |
198 | return (err) ? err : count; |
199 | } |
200 | |
201 | static struct fb_ops hecubafb_ops = { |
202 | .owner = THIS_MODULE, |
203 | .fb_read = fb_sys_read, |
204 | .fb_write = hecubafb_write, |
205 | .fb_fillrect = hecubafb_fillrect, |
206 | .fb_copyarea = hecubafb_copyarea, |
207 | .fb_imageblit = hecubafb_imageblit, |
208 | }; |
209 | |
210 | static struct fb_deferred_io hecubafb_defio = { |
211 | .delay = HZ, |
212 | .deferred_io = hecubafb_dpy_deferred_io, |
213 | }; |
214 | |
215 | static int __devinit hecubafb_probe(struct platform_device *dev) |
216 | { |
217 | struct fb_info *info; |
218 | struct hecuba_board *board; |
219 | int retval = -ENOMEM; |
220 | int videomemorysize; |
221 | unsigned char *videomemory; |
222 | struct hecubafb_par *par; |
223 | |
224 | /* pick up board specific routines */ |
225 | board = dev->dev.platform_data; |
226 | if (!board) |
227 | return -EINVAL; |
228 | |
229 | /* try to count device specific driver, if can't, platform recalls */ |
230 | if (!try_module_get(board->owner)) |
231 | return -ENODEV; |
232 | |
233 | videomemorysize = (DPY_W*DPY_H)/8; |
234 | |
235 | if (!(videomemory = vmalloc(videomemorysize))) |
236 | return retval; |
237 | |
238 | memset(videomemory, 0, videomemorysize); |
239 | |
240 | info = framebuffer_alloc(sizeof(struct hecubafb_par), &dev->dev); |
241 | if (!info) |
242 | goto err_fballoc; |
243 | |
244 | info->screen_base = (char __force __iomem *)videomemory; |
245 | info->fbops = &hecubafb_ops; |
246 | |
247 | info->var = hecubafb_var; |
248 | info->fix = hecubafb_fix; |
249 | info->fix.smem_len = videomemorysize; |
250 | par = info->par; |
251 | par->info = info; |
252 | par->board = board; |
253 | par->send_command = apollo_send_command; |
254 | par->send_data = apollo_send_data; |
255 | |
256 | info->flags = FBINFO_FLAG_DEFAULT; |
257 | |
258 | info->fbdefio = &hecubafb_defio; |
259 | fb_deferred_io_init(info); |
260 | |
261 | retval = register_framebuffer(info); |
262 | if (retval < 0) |
263 | goto err_fbreg; |
264 | platform_set_drvdata(dev, info); |
265 | |
266 | printk(KERN_INFO |
267 | "fb%d: Hecuba frame buffer device, using %dK of video memory\n", |
268 | info->node, videomemorysize >> 10); |
269 | |
270 | /* this inits the dpy */ |
271 | retval = par->board->init(par); |
272 | if (retval < 0) |
273 | goto err_fbreg; |
274 | |
275 | return 0; |
276 | err_fbreg: |
277 | framebuffer_release(info); |
278 | err_fballoc: |
279 | vfree(videomemory); |
280 | module_put(board->owner); |
281 | return retval; |
282 | } |
283 | |
284 | static int __devexit hecubafb_remove(struct platform_device *dev) |
285 | { |
286 | struct fb_info *info = platform_get_drvdata(dev); |
287 | |
288 | if (info) { |
289 | struct hecubafb_par *par = info->par; |
290 | fb_deferred_io_cleanup(info); |
291 | unregister_framebuffer(info); |
292 | vfree((void __force *)info->screen_base); |
293 | if (par->board->remove) |
294 | par->board->remove(par); |
295 | module_put(par->board->owner); |
296 | framebuffer_release(info); |
297 | } |
298 | return 0; |
299 | } |
300 | |
301 | static struct platform_driver hecubafb_driver = { |
302 | .probe = hecubafb_probe, |
303 | .remove = hecubafb_remove, |
304 | .driver = { |
305 | .owner = THIS_MODULE, |
306 | .name = "hecubafb", |
307 | }, |
308 | }; |
309 | |
310 | static int __init hecubafb_init(void) |
311 | { |
312 | return platform_driver_register(&hecubafb_driver); |
313 | } |
314 | |
315 | static void __exit hecubafb_exit(void) |
316 | { |
317 | platform_driver_unregister(&hecubafb_driver); |
318 | } |
319 | |
320 | module_init(hecubafb_init); |
321 | module_exit(hecubafb_exit); |
322 | |
323 | MODULE_DESCRIPTION("fbdev driver for Hecuba/Apollo controller"); |
324 | MODULE_AUTHOR("Jaya Kumar"); |
325 | MODULE_LICENSE("GPL"); |
326 |
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