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Stas Sergeev9ab4d072008-03-03 10:53:54 +01001/*
2 * PC-Speaker driver for Linux
3 *
4 * Copyright (C) 1993-1997 Michael Beck
5 * Copyright (C) 1997-2001 David Woodhouse
6 * Copyright (C) 2001-2008 Stas Sergeev
7 */
8
9#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090010#include <linux/gfp.h>
Stas Sergeev9ab4d072008-03-03 10:53:54 +010011#include <linux/moduleparam.h>
Takashi Iwai96c7d472008-08-11 10:18:39 +020012#include <linux/interrupt.h>
Takashi Iwai6cbbfe12015-01-28 16:49:33 +010013#include <linux/io.h>
Stas Sergeev9ab4d072008-03-03 10:53:54 +010014#include <sound/pcm.h>
Stas Sergeev9ab4d072008-03-03 10:53:54 +010015#include "pcsp.h"
16
Rusty Russella67ff6a2011-12-15 13:49:36 +103017static bool nforce_wa;
Stas Sergeev9ab4d072008-03-03 10:53:54 +010018module_param(nforce_wa, bool, 0444);
19MODULE_PARM_DESC(nforce_wa, "Apply NForce chipset workaround "
20 "(expect bad sound)");
21
Stas Sergeev4dfd7952008-05-17 08:44:41 +020022#define DMIX_WANTS_S16 1
23
Takashi Iwai96c7d472008-08-11 10:18:39 +020024/*
25 * Call snd_pcm_period_elapsed in a tasklet
26 * This avoids spinlock messes and long-running irq contexts
27 */
28static void pcsp_call_pcm_elapsed(unsigned long priv)
29{
30 if (atomic_read(&pcsp_chip.timer_active)) {
31 struct snd_pcm_substream *substream;
32 substream = pcsp_chip.playback_substream;
33 if (substream)
34 snd_pcm_period_elapsed(substream);
35 }
36}
37
38static DECLARE_TASKLET(pcsp_pcm_tasklet, pcsp_call_pcm_elapsed, 0);
39
Takashi Iwaieea05792008-11-26 14:13:03 +010040/* write the port and returns the next expire time in ns;
41 * called at the trigger-start and in hrtimer callback
42 */
Stas Sergeevb71207e2009-10-30 11:51:24 +010043static u64 pcsp_timer_update(struct snd_pcsp *chip)
Stas Sergeev9ab4d072008-03-03 10:53:54 +010044{
Stas Sergeev9ab4d072008-03-03 10:53:54 +010045 unsigned char timer_cnt, val;
Stas Sergeev9ab4d072008-03-03 10:53:54 +010046 u64 ns;
Stas Sergeev9ab4d072008-03-03 10:53:54 +010047 struct snd_pcm_substream *substream;
48 struct snd_pcm_runtime *runtime;
Takashi Iwai96c7d472008-08-11 10:18:39 +020049 unsigned long flags;
Stas Sergeev9ab4d072008-03-03 10:53:54 +010050
51 if (chip->thalf) {
52 outb(chip->val61, 0x61);
53 chip->thalf = 0;
Takashi Iwaieea05792008-11-26 14:13:03 +010054 return chip->ns_rem;
Stas Sergeev9ab4d072008-03-03 10:53:54 +010055 }
56
Takashi Iwai96c7d472008-08-11 10:18:39 +020057 substream = chip->playback_substream;
58 if (!substream)
Takashi Iwaieea05792008-11-26 14:13:03 +010059 return 0;
Stas Sergeev9ab4d072008-03-03 10:53:54 +010060
61 runtime = substream->runtime;
Stas Sergeev4dfd7952008-05-17 08:44:41 +020062 /* assume it is mono! */
Takashi Iwaieea05792008-11-26 14:13:03 +010063 val = runtime->dma_area[chip->playback_ptr + chip->fmt_size - 1];
64 if (chip->is_signed)
Stas Sergeev4dfd7952008-05-17 08:44:41 +020065 val ^= 0x80;
Stas Sergeev9ab4d072008-03-03 10:53:54 +010066 timer_cnt = val * CUR_DIV() / 256;
67
68 if (timer_cnt && chip->enable) {
Thomas Gleixnerced918e2010-02-17 16:47:10 +000069 raw_spin_lock_irqsave(&i8253_lock, flags);
Stas Sergeev9ab4d072008-03-03 10:53:54 +010070 if (!nforce_wa) {
71 outb_p(chip->val61, 0x61);
72 outb_p(timer_cnt, 0x42);
73 outb(chip->val61 ^ 1, 0x61);
74 } else {
75 outb(chip->val61 ^ 2, 0x61);
76 chip->thalf = 1;
77 }
Thomas Gleixnerced918e2010-02-17 16:47:10 +000078 raw_spin_unlock_irqrestore(&i8253_lock, flags);
Stas Sergeev9ab4d072008-03-03 10:53:54 +010079 }
80
Takashi Iwaieea05792008-11-26 14:13:03 +010081 chip->ns_rem = PCSP_PERIOD_NS();
82 ns = (chip->thalf ? PCSP_CALC_NS(timer_cnt) : chip->ns_rem);
83 chip->ns_rem -= ns;
84 return ns;
85}
86
Stas Sergeevb71207e2009-10-30 11:51:24 +010087static void pcsp_pointer_update(struct snd_pcsp *chip)
Takashi Iwaieea05792008-11-26 14:13:03 +010088{
Takashi Iwaieea05792008-11-26 14:13:03 +010089 struct snd_pcm_substream *substream;
Takashi Iwaieea05792008-11-26 14:13:03 +010090 size_t period_bytes, buffer_bytes;
Stas Sergeevb71207e2009-10-30 11:51:24 +010091 int periods_elapsed;
Takashi Iwaieea05792008-11-26 14:13:03 +010092 unsigned long flags;
93
Takashi Iwaieea05792008-11-26 14:13:03 +010094 /* update the playback position */
95 substream = chip->playback_substream;
96 if (!substream)
Stas Sergeevb71207e2009-10-30 11:51:24 +010097 return;
Takashi Iwaieea05792008-11-26 14:13:03 +010098
Stas Sergeev9ab4d072008-03-03 10:53:54 +010099 period_bytes = snd_pcm_lib_period_bytes(substream);
100 buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
Takashi Iwai96c7d472008-08-11 10:18:39 +0200101
102 spin_lock_irqsave(&chip->substream_lock, flags);
Takashi Iwaieea05792008-11-26 14:13:03 +0100103 chip->playback_ptr += PCSP_INDEX_INC() * chip->fmt_size;
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100104 periods_elapsed = chip->playback_ptr - chip->period_ptr;
105 if (periods_elapsed < 0) {
Stas Sergeev42ece6c2008-05-18 18:30:03 +0200106#if PCSP_DEBUG
107 printk(KERN_INFO "PCSP: buffer_bytes mod period_bytes != 0 ? "
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100108 "(%zi %zi %zi)\n",
109 chip->playback_ptr, period_bytes, buffer_bytes);
Stas Sergeev42ece6c2008-05-18 18:30:03 +0200110#endif
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100111 periods_elapsed += buffer_bytes;
112 }
113 periods_elapsed /= period_bytes;
114 /* wrap the pointer _before_ calling snd_pcm_period_elapsed(),
115 * or ALSA will BUG on us. */
116 chip->playback_ptr %= buffer_bytes;
117
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100118 if (periods_elapsed) {
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100119 chip->period_ptr += periods_elapsed * period_bytes;
120 chip->period_ptr %= buffer_bytes;
121 }
Takashi Iwai96c7d472008-08-11 10:18:39 +0200122 spin_unlock_irqrestore(&chip->substream_lock, flags);
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100123
Takashi Iwaieea05792008-11-26 14:13:03 +0100124 if (periods_elapsed)
125 tasklet_schedule(&pcsp_pcm_tasklet);
Stas Sergeevb71207e2009-10-30 11:51:24 +0100126}
127
128enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
129{
130 struct snd_pcsp *chip = container_of(handle, struct snd_pcsp, timer);
131 int pointer_update;
132 u64 ns;
133
134 if (!atomic_read(&chip->timer_active) || !chip->playback_substream)
135 return HRTIMER_NORESTART;
136
137 pointer_update = !chip->thalf;
138 ns = pcsp_timer_update(chip);
139 if (!ns) {
140 printk(KERN_WARNING "PCSP: unexpected stop\n");
141 return HRTIMER_NORESTART;
142 }
143
144 if (pointer_update)
145 pcsp_pointer_update(chip);
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100146
Takashi Iwaieea05792008-11-26 14:13:03 +0100147 hrtimer_forward(handle, hrtimer_get_expires(handle), ns_to_ktime(ns));
148
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100149 return HRTIMER_RESTART;
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100150}
151
Takashi Iwaieea05792008-11-26 14:13:03 +0100152static int pcsp_start_playing(struct snd_pcsp *chip)
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100153{
154#if PCSP_DEBUG
155 printk(KERN_INFO "PCSP: start_playing called\n");
156#endif
157 if (atomic_read(&chip->timer_active)) {
158 printk(KERN_ERR "PCSP: Timer already active\n");
Takashi Iwaieea05792008-11-26 14:13:03 +0100159 return -EIO;
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100160 }
161
Thomas Gleixnerced918e2010-02-17 16:47:10 +0000162 raw_spin_lock(&i8253_lock);
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100163 chip->val61 = inb(0x61) | 0x03;
164 outb_p(0x92, 0x43); /* binary, mode 1, LSB only, ch 2 */
Thomas Gleixnerced918e2010-02-17 16:47:10 +0000165 raw_spin_unlock(&i8253_lock);
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100166 atomic_set(&chip->timer_active, 1);
167 chip->thalf = 0;
168
Stas Sergeevb71207e2009-10-30 11:51:24 +0100169 hrtimer_start(&pcsp_chip.timer, ktime_set(0, 0), HRTIMER_MODE_REL);
Takashi Iwaieea05792008-11-26 14:13:03 +0100170 return 0;
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100171}
172
173static void pcsp_stop_playing(struct snd_pcsp *chip)
174{
175#if PCSP_DEBUG
176 printk(KERN_INFO "PCSP: stop_playing called\n");
177#endif
178 if (!atomic_read(&chip->timer_active))
179 return;
180
181 atomic_set(&chip->timer_active, 0);
Thomas Gleixnerced918e2010-02-17 16:47:10 +0000182 raw_spin_lock(&i8253_lock);
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100183 /* restore the timer */
184 outb_p(0xb6, 0x43); /* binary, mode 3, LSB/MSB, ch 2 */
185 outb(chip->val61 & 0xFC, 0x61);
Thomas Gleixnerced918e2010-02-17 16:47:10 +0000186 raw_spin_unlock(&i8253_lock);
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100187}
188
Takashi Iwai96c7d472008-08-11 10:18:39 +0200189/*
190 * Force to stop and sync the stream
191 */
192void pcsp_sync_stop(struct snd_pcsp *chip)
193{
194 local_irq_disable();
195 pcsp_stop_playing(chip);
196 local_irq_enable();
197 hrtimer_cancel(&chip->timer);
198 tasklet_kill(&pcsp_pcm_tasklet);
199}
200
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100201static int snd_pcsp_playback_close(struct snd_pcm_substream *substream)
202{
203 struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
204#if PCSP_DEBUG
205 printk(KERN_INFO "PCSP: close called\n");
206#endif
Takashi Iwai96c7d472008-08-11 10:18:39 +0200207 pcsp_sync_stop(chip);
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100208 chip->playback_substream = NULL;
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100209 return 0;
210}
211
212static int snd_pcsp_playback_hw_params(struct snd_pcm_substream *substream,
213 struct snd_pcm_hw_params *hw_params)
214{
Takashi Iwai96c7d472008-08-11 10:18:39 +0200215 struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100216 int err;
Takashi Iwai96c7d472008-08-11 10:18:39 +0200217 pcsp_sync_stop(chip);
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100218 err = snd_pcm_lib_malloc_pages(substream,
219 params_buffer_bytes(hw_params));
220 if (err < 0)
221 return err;
222 return 0;
223}
224
225static int snd_pcsp_playback_hw_free(struct snd_pcm_substream *substream)
226{
Takashi Iwai96c7d472008-08-11 10:18:39 +0200227 struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100228#if PCSP_DEBUG
229 printk(KERN_INFO "PCSP: hw_free called\n");
230#endif
Takashi Iwai96c7d472008-08-11 10:18:39 +0200231 pcsp_sync_stop(chip);
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100232 return snd_pcm_lib_free_pages(substream);
233}
234
235static int snd_pcsp_playback_prepare(struct snd_pcm_substream *substream)
236{
237 struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
Takashi Iwai96c7d472008-08-11 10:18:39 +0200238 pcsp_sync_stop(chip);
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100239 chip->playback_ptr = 0;
240 chip->period_ptr = 0;
Takashi Iwaieea05792008-11-26 14:13:03 +0100241 chip->fmt_size =
242 snd_pcm_format_physical_width(substream->runtime->format) >> 3;
243 chip->is_signed = snd_pcm_format_signed(substream->runtime->format);
Stas Sergeevb71207e2009-10-30 11:51:24 +0100244#if PCSP_DEBUG
245 printk(KERN_INFO "PCSP: prepare called, "
246 "size=%zi psize=%zi f=%zi f1=%i fsize=%i\n",
247 snd_pcm_lib_buffer_bytes(substream),
248 snd_pcm_lib_period_bytes(substream),
249 snd_pcm_lib_buffer_bytes(substream) /
250 snd_pcm_lib_period_bytes(substream),
251 substream->runtime->periods,
252 chip->fmt_size);
253#endif
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100254 return 0;
255}
256
257static int snd_pcsp_trigger(struct snd_pcm_substream *substream, int cmd)
258{
259 struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
260#if PCSP_DEBUG
261 printk(KERN_INFO "PCSP: trigger called\n");
262#endif
263 switch (cmd) {
264 case SNDRV_PCM_TRIGGER_START:
265 case SNDRV_PCM_TRIGGER_RESUME:
Takashi Iwaieea05792008-11-26 14:13:03 +0100266 return pcsp_start_playing(chip);
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100267 case SNDRV_PCM_TRIGGER_STOP:
268 case SNDRV_PCM_TRIGGER_SUSPEND:
269 pcsp_stop_playing(chip);
270 break;
271 default:
272 return -EINVAL;
273 }
274 return 0;
275}
276
277static snd_pcm_uframes_t snd_pcsp_playback_pointer(struct snd_pcm_substream
278 *substream)
279{
280 struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
Takashi Iwai96c7d472008-08-11 10:18:39 +0200281 unsigned int pos;
282 spin_lock(&chip->substream_lock);
283 pos = chip->playback_ptr;
284 spin_unlock(&chip->substream_lock);
285 return bytes_to_frames(substream->runtime, pos);
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100286}
287
288static struct snd_pcm_hardware snd_pcsp_playback = {
289 .info = (SNDRV_PCM_INFO_INTERLEAVED |
290 SNDRV_PCM_INFO_HALF_DUPLEX |
291 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
Stas Sergeev4dfd7952008-05-17 08:44:41 +0200292 .formats = (SNDRV_PCM_FMTBIT_U8
293#if DMIX_WANTS_S16
294 | SNDRV_PCM_FMTBIT_S16_LE
295#endif
296 ),
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100297 .rates = SNDRV_PCM_RATE_KNOT,
298 .rate_min = PCSP_DEFAULT_SRATE,
299 .rate_max = PCSP_DEFAULT_SRATE,
300 .channels_min = 1,
301 .channels_max = 1,
302 .buffer_bytes_max = PCSP_BUFFER_SIZE,
303 .period_bytes_min = 64,
304 .period_bytes_max = PCSP_MAX_PERIOD_SIZE,
305 .periods_min = 2,
306 .periods_max = PCSP_MAX_PERIODS,
307 .fifo_size = 0,
308};
309
310static int snd_pcsp_playback_open(struct snd_pcm_substream *substream)
311{
312 struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
313 struct snd_pcm_runtime *runtime = substream->runtime;
314#if PCSP_DEBUG
315 printk(KERN_INFO "PCSP: open called\n");
316#endif
317 if (atomic_read(&chip->timer_active)) {
318 printk(KERN_ERR "PCSP: still active!!\n");
319 return -EBUSY;
320 }
321 runtime->hw = snd_pcsp_playback;
322 chip->playback_substream = substream;
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100323 return 0;
324}
325
326static struct snd_pcm_ops snd_pcsp_playback_ops = {
327 .open = snd_pcsp_playback_open,
328 .close = snd_pcsp_playback_close,
329 .ioctl = snd_pcm_lib_ioctl,
330 .hw_params = snd_pcsp_playback_hw_params,
331 .hw_free = snd_pcsp_playback_hw_free,
332 .prepare = snd_pcsp_playback_prepare,
333 .trigger = snd_pcsp_trigger,
334 .pointer = snd_pcsp_playback_pointer,
335};
336
Bill Pembertonfbbb01a2012-12-06 12:35:27 -0500337int snd_pcsp_new_pcm(struct snd_pcsp *chip)
Stas Sergeev9ab4d072008-03-03 10:53:54 +0100338{
339 int err;
340
341 err = snd_pcm_new(chip->card, "pcspeaker", 0, 1, 0, &chip->pcm);
342 if (err < 0)
343 return err;
344
345 snd_pcm_set_ops(chip->pcm, SNDRV_PCM_STREAM_PLAYBACK,
346 &snd_pcsp_playback_ops);
347
348 chip->pcm->private_data = chip;
349 chip->pcm->info_flags = SNDRV_PCM_INFO_HALF_DUPLEX;
350 strcpy(chip->pcm->name, "pcsp");
351
352 snd_pcm_lib_preallocate_pages_for_all(chip->pcm,
353 SNDRV_DMA_TYPE_CONTINUOUS,
354 snd_dma_continuous_data
355 (GFP_KERNEL), PCSP_BUFFER_SIZE,
356 PCSP_BUFFER_SIZE);
357
358 return 0;
359}