brcm2708: add linux 4.9 support

Patches from Raspberry Pi repo:
https://github.com/raspberrypi/linux/commits/rpi-4.9.y

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 294 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.9/0118-pisound-improvements.patch b/target/linux/brcm2708/patches-4.9/0118-pisound-improvements.patch
new file mode 100644
index 0000000000..af5c3b3fa6
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.9/0118-pisound-improvements.patch
@@ -0,0 +1,294 @@
+From 811d783519254a955ccb7a43b1d8d3f2d29a9a79 Mon Sep 17 00:00:00 2001
+From: Giedrius Trainavicius <giedrius@blokas.io>
+Date: Thu, 5 Jan 2017 02:38:16 +0200
+Subject: [PATCH] pisound improvements:
+
+* 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
+ };
+