1 // SPDX-License-Identifier: GPL-2.0
3  * PC-Speaker driver for Linux
5  * Copyright (C) 1993-1997  Michael Beck
6  * Copyright (C) 1997-2001  David Woodhouse
7  * Copyright (C) 2001-2008  Stas Sergeev
16 #include <sound/pcm.h>
28  * This avoids spinlock messes and long-running irq contexts
43  * called at the trigger-start and in hrtimer callback
53 	if (chip->thalf) {  in pcsp_timer_update()
54 		outb(chip->val61, 0x61);  in pcsp_timer_update()
55 		chip->thalf = 0;  in pcsp_timer_update()
56 		return chip->ns_rem;  in pcsp_timer_update()
59 	substream = chip->playback_substream;  in pcsp_timer_update()
63 	runtime = substream->runtime;  in pcsp_timer_update()
65 	val = runtime->dma_area[chip->playback_ptr + chip->fmt_size - 1];  in pcsp_timer_update()
66 	if (chip->is_signed)  in pcsp_timer_update()
70 	if (timer_cnt && chip->enable) {  in pcsp_timer_update()
73 			outb_p(chip->val61, 0x61);  in pcsp_timer_update()
75 			outb(chip->val61 ^ 1, 0x61);  in pcsp_timer_update()
77 			outb(chip->val61 ^ 2, 0x61);  in pcsp_timer_update()
78 			chip->thalf = 1;  in pcsp_timer_update()
83 	chip->ns_rem = PCSP_PERIOD_NS();  in pcsp_timer_update()
84 	ns = (chip->thalf ? PCSP_CALC_NS(timer_cnt) : chip->ns_rem);  in pcsp_timer_update()
85 	chip->ns_rem -= ns;  in pcsp_timer_update()
97 	substream = chip->playback_substream;  in pcsp_pointer_update()
104 	spin_lock_irqsave(&chip->substream_lock, flags);  in pcsp_pointer_update()
105 	chip->playback_ptr += PCSP_INDEX_INC() * chip->fmt_size;  in pcsp_pointer_update()
106 	periods_elapsed = chip->playback_ptr - chip->period_ptr;  in pcsp_pointer_update()
109 		dev_dbg(chip->card->dev,  in pcsp_pointer_update()
111 			chip->playback_ptr, period_bytes, buffer_bytes);  in pcsp_pointer_update()
118 	chip->playback_ptr %= buffer_bytes;  in pcsp_pointer_update()
121 		chip->period_ptr += periods_elapsed * period_bytes;  in pcsp_pointer_update()
122 		chip->period_ptr %= buffer_bytes;  in pcsp_pointer_update()
125 	spin_unlock_irqrestore(&chip->substream_lock, flags);  in pcsp_pointer_update()
134 	if (!atomic_read(&chip->timer_active) || !chip->playback_substream)  in pcsp_do_timer()
137 	pointer_update = !chip->thalf;  in pcsp_do_timer()
140 		dev_warn(chip->card->dev, "PCSP: unexpected stop\n");  in pcsp_do_timer()
155 	dev_dbg(chip->card->dev, "PCSP: start_playing called\n");  in pcsp_start_playing()
157 	if (atomic_read(&chip->timer_active)) {  in pcsp_start_playing()
158 		dev_err(chip->card->dev, "PCSP: Timer already active\n");  in pcsp_start_playing()
159 		return -EIO;  in pcsp_start_playing()
163 	chip->val61 = inb(0x61) | 0x03;  in pcsp_start_playing()
164 	outb_p(0x92, 0x43);	/* binary, mode 1, LSB only, ch 2 */  in pcsp_start_playing()
166 	atomic_set(&chip->timer_active, 1);  in pcsp_start_playing()
167 	chip->thalf = 0;  in pcsp_start_playing()
176 	dev_dbg(chip->card->dev, "PCSP: stop_playing called\n");  in pcsp_stop_playing()
178 	if (!atomic_read(&chip->timer_active))  in pcsp_stop_playing()
181 	atomic_set(&chip->timer_active, 0);  in pcsp_stop_playing()
184 	outb_p(0xb6, 0x43);	/* binary, mode 3, LSB/MSB, ch 2 */  in pcsp_stop_playing()
185 	outb(chip->val61 & 0xFC, 0x61);  in pcsp_stop_playing()
190  * Force to stop and sync the stream
197 	hrtimer_cancel(&chip->timer);  in pcsp_sync_stop()
205 	dev_dbg(chip->card->dev, "PCSP: close called\n");  in snd_pcsp_playback_close()
208 	chip->playback_substream = NULL;  in snd_pcsp_playback_close()
224 	dev_dbg(chip->card->dev, "PCSP: hw_free called\n");  in snd_pcsp_playback_hw_free()
234 	chip->playback_ptr = 0;  in snd_pcsp_playback_prepare()
235 	chip->period_ptr = 0;  in snd_pcsp_playback_prepare()
236 	chip->fmt_size =  in snd_pcsp_playback_prepare()
237 		snd_pcm_format_physical_width(substream->runtime->format) >> 3;  in snd_pcsp_playback_prepare()
238 	chip->is_signed = snd_pcm_format_signed(substream->runtime->format);  in snd_pcsp_playback_prepare()
240 	dev_dbg(chip->card->dev, "PCSP: prepare called, size=%zi psize=%zi f=%zi f1=%i fsize=%i\n",  in snd_pcsp_playback_prepare()
245 		substream->runtime->periods,  in snd_pcsp_playback_prepare()
246 		chip->fmt_size);  in snd_pcsp_playback_prepare()
255 	dev_dbg(chip->card->dev, "PCSP: trigger called\n");  in snd_pcsp_trigger()
266 		return -EINVAL;  in snd_pcsp_trigger()
276 	spin_lock(&chip->substream_lock);  in snd_pcsp_playback_pointer()
277 	pos = chip->playback_ptr;  in snd_pcsp_playback_pointer()
278 	spin_unlock(&chip->substream_lock);  in snd_pcsp_playback_pointer()
279 	return bytes_to_frames(substream->runtime, pos);  in snd_pcsp_playback_pointer()
307 	struct snd_pcm_runtime *runtime = substream->runtime;  in snd_pcsp_playback_open()
309 	dev_dbg(chip->card->dev, "PCSP: open called\n");  in snd_pcsp_playback_open()
311 	if (atomic_read(&chip->timer_active)) {  in snd_pcsp_playback_open()
312 		dev_err(chip->card->dev, "PCSP: still active!!\n");  in snd_pcsp_playback_open()
313 		return -EBUSY;  in snd_pcsp_playback_open()
315 	runtime->hw = snd_pcsp_playback;  in snd_pcsp_playback_open()
316 	chip->playback_substream = substream;  in snd_pcsp_playback_open()
334 	err = snd_pcm_new(chip->card, "pcspeaker", 0, 1, 0, &chip->pcm);  in snd_pcsp_new_pcm()
338 	snd_pcm_set_ops(chip->pcm, SNDRV_PCM_STREAM_PLAYBACK,  in snd_pcsp_new_pcm()
341 	chip->pcm->private_data = chip;  in snd_pcsp_new_pcm()
342 	chip->pcm->info_flags = SNDRV_PCM_INFO_HALF_DUPLEX;  in snd_pcsp_new_pcm()
343 	strcpy(chip->pcm->name, "pcsp");  in snd_pcsp_new_pcm()
345 	snd_pcm_set_managed_buffer_all(chip->pcm,  in snd_pcsp_new_pcm()