aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/brcm2708/patches-4.4/0564-pisound-improvements-1778.patch
blob: 8fe127a433786c9f1545c5ca368f7c5f5c7084da (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
From ed621cdfdf0a5acf35079208818c9648f44ec638 Mon Sep 17 00:00:00 2001
From: gtrainavicius <gtrainavicius@users.noreply.github.com>
Date: Thu, 5 Jan 2017 17:08:45 +0200
Subject: [PATCH] pisound improvements: (#1778)

* Added a writable sysfs object to enable scripts / user space software
to blink MIDI activity LEDs for variable duration.
* Improved hw_param constraints setting.
* Added compatibility with S16_LE sample format.
* Exposed some simple placeholder volume controls, so the card appears
in volumealsa widget.

Signed-off-by: Giedrius Trainavicius <giedrius@blokas.io>
---
 sound/soc/bcm/pisound.c | 175 ++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 154 insertions(+), 21 deletions(-)

--- a/sound/soc/bcm/pisound.c
+++ b/sound/soc/bcm/pisound.c
@@ -36,6 +36,7 @@
 #include <sound/jack.h>
 #include <sound/rawmidi.h>
 #include <sound/asequencer.h>
+#include <sound/control.h>
 
 static int pisnd_spi_init(struct device *dev);
 static void pisnd_spi_uninit(void);
@@ -214,6 +215,9 @@ static char g_serial_num[11];
 static char g_id[25];
 static char g_version[5];
 
+static uint8_t g_ledFlashDuration;
+static bool    g_ledFlashDurationChanged;
+
 DEFINE_KFIFO(spi_fifo_in,  uint8_t, FIFO_SIZE);
 DEFINE_KFIFO(spi_fifo_out, uint8_t, FIFO_SIZE);
 
@@ -396,8 +400,13 @@ static void pisnd_work_handler(struct wo
 			val = 0;
 			tx = 0;
 
-			if (kfifo_get(&spi_fifo_out, &val))
+			if (g_ledFlashDurationChanged) {
+				tx = 0xf000 | g_ledFlashDuration;
+				g_ledFlashDuration = 0;
+				g_ledFlashDurationChanged = false;
+			} else if (kfifo_get(&spi_fifo_out, &val)) {
 				tx = 0x0f00 | val;
+			}
 
 			rx = spi_transfer16(tx);
 
@@ -410,6 +419,7 @@ static void pisnd_work_handler(struct wo
 		} while (rx != 0
 			|| !kfifo_is_empty(&spi_fifo_out)
 			|| pisnd_spi_has_more()
+			|| g_ledFlashDurationChanged
 			);
 
 		if (!kfifo_is_empty(&spi_fifo_in) && g_recvCallback)
@@ -569,7 +579,7 @@ static int pisnd_spi_init(struct device
 	}
 
 	/* Flash the LEDs. */
-	spi_transfer16(0xf000);
+	spi_transfer16(0xf008);
 
 	ret = pisnd_spi_gpio_irq_init(dev);
 	if (ret < 0) {
@@ -610,6 +620,14 @@ static void pisnd_spi_uninit(void)
 	pisnd_spi_gpio_uninit();
 }
 
+static void pisnd_spi_flash_leds(uint8_t duration)
+{
+	g_ledFlashDuration = duration;
+	g_ledFlashDurationChanged = true;
+	printd("schedule from spi_flash_leds\n");
+	pisnd_schedule_process(TASK_PROCESS);
+}
+
 static void pisnd_spi_send(uint8_t val)
 {
 	kfifo_put(&spi_fifo_out, val);
@@ -658,6 +676,83 @@ static const struct of_device_id pisound
 	{},
 };
 
+enum {
+	SWITCH = 0,
+	VOLUME = 1,
+};
+
+static int pisnd_ctl_info(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_info *uinfo)
+{
+	if (kcontrol->private_value == SWITCH) {
+		uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+		uinfo->count = 1;
+		uinfo->value.integer.min = 0;
+		uinfo->value.integer.max = 1;
+		return 0;
+	} else if (kcontrol->private_value == VOLUME) {
+		uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+		uinfo->count = 1;
+		uinfo->value.integer.min = 0;
+		uinfo->value.integer.max = 100;
+		return 0;
+	}
+	return -EINVAL;
+}
+
+static int pisnd_ctl_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	if (kcontrol->private_value == SWITCH) {
+		ucontrol->value.integer.value[0] = 1;
+		return 0;
+	} else if (kcontrol->private_value == VOLUME) {
+		ucontrol->value.integer.value[0] = 100;
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static struct snd_kcontrol_new pisnd_ctl[] = {
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+		.name = "PCM Playback Switch",
+		.index = 0,
+		.private_value = SWITCH,
+		.access = SNDRV_CTL_ELEM_ACCESS_READ,
+		.info = pisnd_ctl_info,
+		.get = pisnd_ctl_get,
+	},
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+		.name = "PCM Playback Volume",
+		.index = 0,
+		.private_value = VOLUME,
+		.access = SNDRV_CTL_ELEM_ACCESS_READ,
+		.info = pisnd_ctl_info,
+		.get = pisnd_ctl_get,
+	},
+};
+
+static int pisnd_ctl_init(struct snd_card *card)
+{
+	int err, i;
+
+	for (i = 0; i < ARRAY_SIZE(pisnd_ctl); ++i) {
+		err = snd_ctl_add(card, snd_ctl_new1(&pisnd_ctl[i], NULL));
+		if (err < 0)
+			return err;
+	}
+
+	return 0;
+}
+
+static int pisnd_ctl_uninit(void)
+{
+	return 0;
+}
+
 static struct gpio_desc *osr0, *osr1, *osr2;
 static struct gpio_desc *reset;
 static struct gpio_desc *button;
@@ -667,6 +762,14 @@ static int pisnd_hw_params(
 	struct snd_pcm_hw_params *params
 	)
 {
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+
+	/* pisound runs on fixed 32 clock counts per channel,
+	 * as generated by the master ADC.
+	 */
+	snd_soc_dai_set_bclk_ratio(cpu_dai, 32*2);
+
 	printd("rate   = %d\n", params_rate(params));
 	printd("ch     = %d\n", params_channels(params));
 	printd("bits   = %u\n",
@@ -711,16 +814,6 @@ static struct snd_pcm_hw_constraint_list
 	.mask = 0,
 };
 
-static unsigned int sample_bits[] = {
-	24, 32
-};
-
-static struct snd_pcm_hw_constraint_list constraints_sample_bits = {
-	.count = ARRAY_SIZE(sample_bits),
-	.list = sample_bits,
-	.mask = 0,
-};
-
 static int pisnd_startup(struct snd_pcm_substream *substream)
 {
 	int err = snd_pcm_hw_constraint_list(
@@ -733,11 +826,21 @@ static int pisnd_startup(struct snd_pcm_
 	if (err < 0)
 		return err;
 
-	err = snd_pcm_hw_constraint_list(
+	err = snd_pcm_hw_constraint_single(
 		substream->runtime,
-		0,
-		SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
-		&constraints_sample_bits
+		SNDRV_PCM_HW_PARAM_CHANNELS,
+		2
+		);
+
+	if (err < 0)
+		return err;
+
+	err = snd_pcm_hw_constraint_mask64(
+		substream->runtime,
+		SNDRV_PCM_HW_PARAM_FORMAT,
+		SNDRV_PCM_FMTBIT_S16_LE |
+		SNDRV_PCM_FMTBIT_S24_LE |
+		SNDRV_PCM_FMTBIT_S32_LE
 		);
 
 	if (err < 0)
@@ -771,14 +874,23 @@ static int pisnd_card_probe(struct snd_s
 {
 	int err = pisnd_midi_init(card->snd_card);
 
-	if (err < 0)
+	if (err < 0) {
 		printe("pisnd_midi_init failed: %d\n", err);
+		return err;
+	}
 
-	return err;
+	err = pisnd_ctl_init(card->snd_card);
+	if (err < 0) {
+		printe("pisnd_ctl_init failed: %d\n", err);
+		return err;
+	}
+
+	return 0;
 }
 
 static int pisnd_card_remove(struct snd_soc_card *card)
 {
+	pisnd_ctl_uninit();
 	pisnd_midi_uninit();
 	return 0;
 }
@@ -870,17 +982,38 @@ static ssize_t pisnd_version_show(
 	return sprintf(buf, "%s\n", pisnd_spi_get_version());
 }
 
+static ssize_t pisnd_led_store(
+	struct kobject *kobj,
+	struct kobj_attribute *attr,
+	const char *buf,
+	size_t length
+	)
+{
+	uint32_t timeout;
+	int err;
+
+	err = kstrtou32(buf, 10, &timeout);
+
+	if (err == 0 && timeout <= 255)
+		pisnd_spi_flash_leds(timeout);
+
+	return length;
+}
+
 static struct kobj_attribute pisnd_serial_attribute =
-	__ATTR(serial, 0644, pisnd_serial_show, NULL);
+	__ATTR(serial, 0444, pisnd_serial_show, NULL);
 static struct kobj_attribute pisnd_id_attribute =
-	__ATTR(id, 0644, pisnd_id_show, NULL);
+	__ATTR(id, 0444, pisnd_id_show, NULL);
 static struct kobj_attribute pisnd_version_attribute =
-	__ATTR(version, 0644, pisnd_version_show, NULL);
+	__ATTR(version, 0444, pisnd_version_show, NULL);
+static struct kobj_attribute pisnd_led_attribute =
+	__ATTR(led, 0644, NULL, pisnd_led_store);
 
 static struct attribute *attrs[] = {
 	&pisnd_serial_attribute.attr,
 	&pisnd_id_attribute.attr,
 	&pisnd_version_attribute.attr,
+	&pisnd_led_attribute.attr,
 	NULL
 };