[PATCH] mark struct file_operations const 9
[linux-2.6.git] / sound / oss / sh_dac_audio.c
1 /*
2  * sound/oss/sh_dac_audio.c
3  *
4  * SH DAC based sound :(
5  *
6  *  Copyright (C) 2004,2005  Andriy Skulysh
7  *
8  * This file is subject to the terms and conditions of the GNU General Public
9  * License.  See the file "COPYING" in the main directory of this archive
10  * for more details.
11  */
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/sched.h>
15 #include <linux/linkage.h>
16 #include <linux/slab.h>
17 #include <linux/fs.h>
18 #include <linux/sound.h>
19 #include <linux/soundcard.h>
20 #include <linux/interrupt.h>
21 #include <asm/io.h>
22 #include <asm/uaccess.h>
23 #include <asm/irq.h>
24 #include <asm/delay.h>
25 #include <asm/clock.h>
26 #include <asm/cpu/dac.h>
27 #include <asm/cpu/timer.h>
28 #include <asm/machvec.h>
29 #include <asm/hp6xx.h>
30 #include <asm/hd64461.h>
31
32 #define MODNAME "sh_dac_audio"
33
34 #define TMU_TOCR_INIT   0x00
35
36 #define TMU1_TCR_INIT   0x0020  /* Clock/4, rising edge; interrupt on */
37 #define TMU1_TSTR_INIT  0x02    /* Bit to turn on TMU1 */
38
39 #define BUFFER_SIZE 48000
40
41 static int rate;
42 static int empty;
43 static char *data_buffer, *buffer_begin, *buffer_end;
44 static int in_use, device_major;
45
46 static void dac_audio_start_timer(void)
47 {
48         u8 tstr;
49
50         tstr = ctrl_inb(TMU_TSTR);
51         tstr |= TMU1_TSTR_INIT;
52         ctrl_outb(tstr, TMU_TSTR);
53 }
54
55 static void dac_audio_stop_timer(void)
56 {
57         u8 tstr;
58
59         tstr = ctrl_inb(TMU_TSTR);
60         tstr &= ~TMU1_TSTR_INIT;
61         ctrl_outb(tstr, TMU_TSTR);
62 }
63
64 static void dac_audio_reset(void)
65 {
66         dac_audio_stop_timer();
67         buffer_begin = buffer_end = data_buffer;
68         empty = 1;
69 }
70
71 static void dac_audio_sync(void)
72 {
73         while (!empty)
74                 schedule();
75 }
76
77 static void dac_audio_start(void)
78 {
79         if (mach_is_hp6xx()) {
80                 u16 v = inw(HD64461_GPADR);
81                 v &= ~HD64461_GPADR_SPEAKER;
82                 outw(v, HD64461_GPADR);
83         }
84
85         sh_dac_enable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
86         ctrl_outw(TMU1_TCR_INIT, TMU1_TCR);
87 }
88 static void dac_audio_stop(void)
89 {
90         dac_audio_stop_timer();
91
92         if (mach_is_hp6xx()) {
93                 u16 v = inw(HD64461_GPADR);
94                 v |= HD64461_GPADR_SPEAKER;
95                 outw(v, HD64461_GPADR);
96         }
97
98         sh_dac_output(0, CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
99         sh_dac_disable(CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
100 }
101
102 static void dac_audio_set_rate(void)
103 {
104         unsigned long interval;
105         struct clk *clk;
106
107         clk = clk_get("module_clk");
108         interval = (clk_get_rate(clk) / 4) / rate;
109         clk_put(clk);
110         ctrl_outl(interval, TMU1_TCOR);
111         ctrl_outl(interval, TMU1_TCNT);
112 }
113
114 static int dac_audio_ioctl(struct inode *inode, struct file *file,
115                            unsigned int cmd, unsigned long arg)
116 {
117         int val;
118
119         switch (cmd) {
120         case OSS_GETVERSION:
121                 return put_user(SOUND_VERSION, (int *)arg);
122
123         case SNDCTL_DSP_SYNC:
124                 dac_audio_sync();
125                 return 0;
126
127         case SNDCTL_DSP_RESET:
128                 dac_audio_reset();
129                 return 0;
130
131         case SNDCTL_DSP_GETFMTS:
132                 return put_user(AFMT_U8, (int *)arg);
133
134         case SNDCTL_DSP_SETFMT:
135                 return put_user(AFMT_U8, (int *)arg);
136
137         case SNDCTL_DSP_NONBLOCK:
138                 file->f_flags |= O_NONBLOCK;
139                 return 0;
140
141         case SNDCTL_DSP_GETCAPS:
142                 return 0;
143
144         case SOUND_PCM_WRITE_RATE:
145                 val = *(int *)arg;
146                 if (val > 0) {
147                         rate = val;
148                         dac_audio_set_rate();
149                 }
150                 return put_user(rate, (int *)arg);
151
152         case SNDCTL_DSP_STEREO:
153                 return put_user(0, (int *)arg);
154
155         case SOUND_PCM_WRITE_CHANNELS:
156                 return put_user(1, (int *)arg);
157
158         case SNDCTL_DSP_SETDUPLEX:
159                 return -EINVAL;
160
161         case SNDCTL_DSP_PROFILE:
162                 return -EINVAL;
163
164         case SNDCTL_DSP_GETBLKSIZE:
165                 return put_user(BUFFER_SIZE, (int *)arg);
166
167         case SNDCTL_DSP_SETFRAGMENT:
168                 return 0;
169
170         default:
171                 printk(KERN_ERR "sh_dac_audio: unimplemented ioctl=0x%x\n",
172                        cmd);
173                 return -EINVAL;
174         }
175         return -EINVAL;
176 }
177
178 static ssize_t dac_audio_write(struct file *file, const char *buf, size_t count,
179                                loff_t * ppos)
180 {
181         int free;
182         int nbytes;
183
184         if (count < 0)
185                 return -EINVAL;
186
187         if (!count) {
188                 dac_audio_sync();
189                 return 0;
190         }
191
192         free = buffer_begin - buffer_end;
193
194         if (free < 0)
195                 free += BUFFER_SIZE;
196         if ((free == 0) && (empty))
197                 free = BUFFER_SIZE;
198         if (count > free)
199                 count = free;
200         if (buffer_begin > buffer_end) {
201                 if (copy_from_user((void *)buffer_end, buf, count))
202                         return -EFAULT;
203
204                 buffer_end += count;
205         } else {
206                 nbytes = data_buffer + BUFFER_SIZE - buffer_end;
207                 if (nbytes > count) {
208                         if (copy_from_user((void *)buffer_end, buf, count))
209                                 return -EFAULT;
210                         buffer_end += count;
211                 } else {
212                         if (copy_from_user((void *)buffer_end, buf, nbytes))
213                                 return -EFAULT;
214                         if (copy_from_user
215                             ((void *)data_buffer, buf + nbytes, count - nbytes))
216                                 return -EFAULT;
217                         buffer_end = data_buffer + count - nbytes;
218                 }
219         }
220
221         if (empty) {
222                 empty = 0;
223                 dac_audio_start_timer();
224         }
225
226         return count;
227 }
228
229 static ssize_t dac_audio_read(struct file *file, char *buf, size_t count,
230                               loff_t * ppos)
231 {
232         return -EINVAL;
233 }
234
235 static int dac_audio_open(struct inode *inode, struct file *file)
236 {
237         if (file->f_mode & FMODE_READ)
238                 return -ENODEV;
239         if (in_use)
240                 return -EBUSY;
241
242         in_use = 1;
243
244         dac_audio_start();
245
246         return 0;
247 }
248
249 static int dac_audio_release(struct inode *inode, struct file *file)
250 {
251         dac_audio_sync();
252         dac_audio_stop();
253         in_use = 0;
254
255         return 0;
256 }
257
258 const struct file_operations dac_audio_fops = {
259       .read =           dac_audio_read,
260       .write =  dac_audio_write,
261       .ioctl =  dac_audio_ioctl,
262       .open =           dac_audio_open,
263       .release =        dac_audio_release,
264 };
265
266 static irqreturn_t timer1_interrupt(int irq, void *dev)
267 {
268         unsigned long timer_status;
269
270         timer_status = ctrl_inw(TMU1_TCR);
271         timer_status &= ~0x100;
272         ctrl_outw(timer_status, TMU1_TCR);
273
274         if (!empty) {
275                 sh_dac_output(*buffer_begin, CONFIG_SOUND_SH_DAC_AUDIO_CHANNEL);
276                 buffer_begin++;
277
278                 if (buffer_begin == data_buffer + BUFFER_SIZE)
279                         buffer_begin = data_buffer;
280                 if (buffer_begin == buffer_end) {
281                         empty = 1;
282                         dac_audio_stop_timer();
283                 }
284         }
285         return IRQ_HANDLED;
286 }
287
288 static int __init dac_audio_init(void)
289 {
290         int retval;
291
292         if ((device_major = register_sound_dsp(&dac_audio_fops, -1)) < 0) {
293                 printk(KERN_ERR "Cannot register dsp device");
294                 return device_major;
295         }
296
297         in_use = 0;
298
299         data_buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL);
300         if (data_buffer == NULL)
301                 return -ENOMEM;
302
303         dac_audio_reset();
304         rate = 8000;
305         dac_audio_set_rate();
306
307         retval =
308             request_irq(TIMER1_IRQ, timer1_interrupt, IRQF_DISABLED, MODNAME, 0);
309         if (retval < 0) {
310                 printk(KERN_ERR "sh_dac_audio: IRQ %d request failed\n",
311                        TIMER1_IRQ);
312                 return retval;
313         }
314
315         return 0;
316 }
317
318 static void __exit dac_audio_exit(void)
319 {
320         free_irq(TIMER1_IRQ, 0);
321
322         unregister_sound_dsp(device_major);
323         kfree((void *)data_buffer);
324 }
325
326 module_init(dac_audio_init);
327 module_exit(dac_audio_exit);
328
329 MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
330 MODULE_DESCRIPTION("SH DAC sound driver");
331 MODULE_LICENSE("GPL");