--- /dev/null
+From 16123264d8fb86c7c9efaed230a4b0028c3be800 Mon Sep 17 00:00:00 2001
+From: gtrainavicius <gtrainavicius@users.noreply.github.com>
+Date: Sun, 23 Oct 2016 12:06:53 +0300
+Subject: [PATCH 082/454] Support for Blokas Labs pisound board
+
+Pisound dynamic overlay (#1760)
+
+Restructuring pisound-overlay.dts, so it can be loaded and unloaded dynamically using dtoverlay.
+
+Print a logline when the kernel module is removed.
+
+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>
+---
+ .../devicetree/bindings/vendor-prefixes.txt | 1 +
+ sound/soc/bcm/Kconfig | 6 +
+ sound/soc/bcm/Makefile | 2 +
+ sound/soc/bcm/pisound.c | 1123 +++++++++++++++++
+ 4 files changed, 1132 insertions(+)
+ create mode 100644 sound/soc/bcm/pisound.c
+
+--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
++++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
+@@ -49,6 +49,7 @@ axentia Axentia Technologies AB
+ axis Axis Communications AB
+ bananapi BIPAI KEJI LIMITED
+ bhf Beckhoff Automation GmbH & Co. KG
++blokaslabs Vilniaus Blokas UAB
+ boe BOE Technology Group Co., Ltd.
+ bosch Bosch Sensortec GmbH
+ boundary Boundary Devices Inc.
+--- a/sound/soc/bcm/Kconfig
++++ b/sound/soc/bcm/Kconfig
+@@ -145,3 +145,9 @@ config SND_BCM2708_SOC_ALLO_BOSS_DAC
+ select SND_SOC_PCM512x_I2C
+ help
+ Say Y or M if you want to add support for Allo Boss DAC.
++
++config SND_PISOUND
++ tristate "Support for Blokas Labs pisound"
++ depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
++ help
++ Say Y or M if you want to add support for Blokas Labs pisound.
+--- a/sound/soc/bcm/Makefile
++++ b/sound/soc/bcm/Makefile
+@@ -27,6 +27,7 @@ snd-soc-dionaudio-loco-objs := dionaudio
+ snd-soc-allo-boss-dac-objs := allo-boss-dac.o
+ snd-soc-allo-piano-dac-objs := allo-piano-dac.o
+ snd-soc-allo-piano-dac-plus-objs := allo-piano-dac-plus.o
++snd-soc-pisound-objs := pisound.o
+
+ obj-$(CONFIG_SND_BCM2708_SOC_ADAU1977_ADC) += snd-soc-adau1977-adc.o
+ obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_AMP) += snd-soc-hifiberry-amp.o
+@@ -46,3 +47,4 @@ obj-$(CONFIG_SND_BCM2708_SOC_DIONAUDIO_L
+ obj-$(CONFIG_SND_BCM2708_SOC_ALLO_BOSS_DAC) += snd-soc-allo-boss-dac.o
+ obj-$(CONFIG_SND_BCM2708_SOC_ALLO_PIANO_DAC) += snd-soc-allo-piano-dac.o
+ obj-$(CONFIG_SND_BCM2708_SOC_ALLO_PIANO_DAC_PLUS) += snd-soc-allo-piano-dac-plus.o
++obj-$(CONFIG_SND_PISOUND) += snd-soc-pisound.o
+--- /dev/null
++++ b/sound/soc/bcm/pisound.c
+@@ -0,0 +1,1123 @@
++/*
++ * pisound Linux kernel module.
++ * Copyright (C) 2016 Vilniaus Blokas UAB, http://blokas.io/pisound
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License
++ * as published by the Free Software Foundation; version 2 of the
++ * License.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
++ * MA 02110-1301, USA.
++ */
++
++#include <linux/init.h>
++#include <linux/module.h>
++#include <linux/platform_device.h>
++#include <linux/gpio.h>
++#include <linux/kobject.h>
++#include <linux/sysfs.h>
++#include <linux/delay.h>
++#include <linux/spi/spi.h>
++#include <linux/interrupt.h>
++#include <linux/kfifo.h>
++
++#include <sound/core.h>
++#include <sound/pcm.h>
++#include <sound/pcm_params.h>
++#include <sound/soc.h>
++#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);
++
++static void pisnd_spi_send(uint8_t val);
++static uint8_t pisnd_spi_recv(uint8_t *buffer, uint8_t length);
++
++typedef void (*pisnd_spi_recv_cb)(void *data);
++static void pisnd_spi_set_callback(pisnd_spi_recv_cb cb, void *data);
++
++static const char *pisnd_spi_get_serial(void);
++static const char *pisnd_spi_get_id(void);
++static const char *pisnd_spi_get_version(void);
++
++static int pisnd_midi_init(struct snd_card *card);
++static void pisnd_midi_uninit(void);
++
++#define PISOUND_LOG_PREFIX "pisound: "
++
++#ifdef DEBUG
++# define printd(...) pr_alert(PISOUND_LOG_PREFIX __VA_ARGS__)
++#else
++# define printd(...) do {} while (0)
++#endif
++
++#define printe(...) pr_err(PISOUND_LOG_PREFIX __VA_ARGS__)
++#define printi(...) pr_info(PISOUND_LOG_PREFIX __VA_ARGS__)
++
++static int pisnd_output_open(struct snd_rawmidi_substream *substream)
++{
++ return 0;
++}
++
++static int pisnd_output_close(struct snd_rawmidi_substream *substream)
++{
++ return 0;
++}
++
++static void pisnd_output_trigger(
++ struct snd_rawmidi_substream *substream,
++ int up
++ )
++{
++ uint8_t data;
++
++ if (!up)
++ return;
++
++ while (snd_rawmidi_transmit_peek(substream, &data, 1)) {
++ pisnd_spi_send(data);
++ snd_rawmidi_transmit_ack(substream, 1);
++ }
++}
++
++static void pisnd_output_drain(struct snd_rawmidi_substream *substream)
++{
++ uint8_t data;
++
++ while (snd_rawmidi_transmit_peek(substream, &data, 1)) {
++ pisnd_spi_send(data);
++
++ snd_rawmidi_transmit_ack(substream, 1);
++ }
++}
++
++static int pisnd_input_open(struct snd_rawmidi_substream *substream)
++{
++ return 0;
++}
++
++static int pisnd_input_close(struct snd_rawmidi_substream *substream)
++{
++ return 0;
++}
++
++static void pisnd_midi_recv_callback(void *substream)
++{
++ uint8_t data[128];
++ uint8_t n = 0;
++
++ while ((n = pisnd_spi_recv(data, sizeof(data)))) {
++ int res = snd_rawmidi_receive(substream, data, n);
++ (void)res;
++ printd("midi recv 0x%02x, res = %d\n", data, res);
++ }
++}
++
++static void pisnd_input_trigger(struct snd_rawmidi_substream *substream, int up)
++{
++ if (up) {
++ pisnd_spi_set_callback(pisnd_midi_recv_callback, substream);
++ pisnd_midi_recv_callback(substream);
++ } else {
++ pisnd_spi_set_callback(NULL, NULL);
++ }
++}
++
++static struct snd_rawmidi *g_rmidi;
++
++static struct snd_rawmidi_ops pisnd_output_ops = {
++ .open = pisnd_output_open,
++ .close = pisnd_output_close,
++ .trigger = pisnd_output_trigger,
++ .drain = pisnd_output_drain,
++};
++
++static struct snd_rawmidi_ops pisnd_input_ops = {
++ .open = pisnd_input_open,
++ .close = pisnd_input_close,
++ .trigger = pisnd_input_trigger,
++};
++
++static void pisnd_get_port_info(
++ struct snd_rawmidi *rmidi,
++ int number,
++ struct snd_seq_port_info *seq_port_info
++ )
++{
++ seq_port_info->type =
++ SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
++ SNDRV_SEQ_PORT_TYPE_HARDWARE |
++ SNDRV_SEQ_PORT_TYPE_PORT;
++ seq_port_info->midi_voices = 0;
++}
++
++static struct snd_rawmidi_global_ops pisnd_global_ops = {
++ .get_port_info = pisnd_get_port_info,
++};
++
++static int pisnd_midi_init(struct snd_card *card)
++{
++ int err = snd_rawmidi_new(card, "pisound MIDI", 0, 1, 1, &g_rmidi);
++
++ if (err < 0) {
++ printe("snd_rawmidi_new failed: %d\n", err);
++ return err;
++ }
++
++ strcpy(g_rmidi->name, "pisound MIDI ");
++ strcat(g_rmidi->name, pisnd_spi_get_serial());
++
++ g_rmidi->info_flags =
++ SNDRV_RAWMIDI_INFO_OUTPUT |
++ SNDRV_RAWMIDI_INFO_INPUT |
++ SNDRV_RAWMIDI_INFO_DUPLEX;
++
++ g_rmidi->ops = &pisnd_global_ops;
++
++ g_rmidi->private_data = (void *)0;
++
++ snd_rawmidi_set_ops(
++ g_rmidi,
++ SNDRV_RAWMIDI_STREAM_OUTPUT,
++ &pisnd_output_ops
++ );
++
++ snd_rawmidi_set_ops(
++ g_rmidi,
++ SNDRV_RAWMIDI_STREAM_INPUT,
++ &pisnd_input_ops
++ );
++
++ return 0;
++}
++
++static void pisnd_midi_uninit(void)
++{
++}
++
++static void *g_recvData;
++static pisnd_spi_recv_cb g_recvCallback;
++
++#define FIFO_SIZE 512
++
++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);
++
++static struct gpio_desc *data_available;
++static struct gpio_desc *spi_reset;
++
++static struct spi_device *pisnd_spi_device;
++
++static struct workqueue_struct *pisnd_workqueue;
++static struct work_struct pisnd_work_process;
++
++static void pisnd_work_handler(struct work_struct *work);
++
++static uint16_t spi_transfer16(uint16_t val);
++
++static int pisnd_init_workqueues(void)
++{
++ pisnd_workqueue = create_singlethread_workqueue("pisnd_workqueue");
++ INIT_WORK(&pisnd_work_process, pisnd_work_handler);
++
++ return 0;
++}
++
++static void pisnd_uninit_workqueues(void)
++{
++ flush_workqueue(pisnd_workqueue);
++ destroy_workqueue(pisnd_workqueue);
++
++ pisnd_workqueue = NULL;
++}
++
++static bool pisnd_spi_has_more(void)
++{
++ return gpiod_get_value(data_available);
++}
++
++enum task_e {
++ TASK_PROCESS = 0,
++};
++
++static void pisnd_schedule_process(enum task_e task)
++{
++ if (pisnd_spi_device != NULL &&
++ pisnd_workqueue != NULL &&
++ !work_pending(&pisnd_work_process)
++ ) {
++ printd("schedule: has more = %d\n", pisnd_spi_has_more());
++ if (task == TASK_PROCESS)
++ queue_work(pisnd_workqueue, &pisnd_work_process);
++ }
++}
++
++static irqreturn_t data_available_interrupt_handler(int irq, void *dev_id)
++{
++ if (irq == gpiod_to_irq(data_available) && pisnd_spi_has_more()) {
++ printd("schedule from irq\n");
++ pisnd_schedule_process(TASK_PROCESS);
++ }
++
++ return IRQ_HANDLED;
++}
++
++static DEFINE_SPINLOCK(spilock);
++static unsigned long spilockflags;
++
++static uint16_t spi_transfer16(uint16_t val)
++{
++ int err;
++ struct spi_transfer transfer;
++ struct spi_message msg;
++ uint8_t txbuf[2];
++ uint8_t rxbuf[2];
++
++ if (!pisnd_spi_device) {
++ printe("pisnd_spi_device null, returning\n");
++ return 0;
++ }
++
++ spi_message_init(&msg);
++
++ memset(&transfer, 0, sizeof(transfer));
++ memset(&rxbuf, 0, sizeof(rxbuf));
++
++ txbuf[0] = val >> 8;
++ txbuf[1] = val & 0xff;
++
++ transfer.tx_buf = &txbuf;
++ transfer.rx_buf = &rxbuf;
++ transfer.len = sizeof(txbuf);
++ transfer.speed_hz = 125000;
++ transfer.delay_usecs = 100;
++ spi_message_add_tail(&transfer, &msg);
++
++ spin_lock_irqsave(&spilock, spilockflags);
++ err = spi_sync(pisnd_spi_device, &msg);
++ spin_unlock_irqrestore(&spilock, spilockflags);
++
++ if (err < 0) {
++ printe("spi_sync error %d\n", err);
++ return 0;
++ }
++
++ printd("received: %02x%02x\n", rxbuf[0], rxbuf[1]);
++ printd("hasMore %d\n", pisnd_spi_has_more());
++
++ return (rxbuf[0] << 8) | rxbuf[1];
++}
++
++static int spi_read_bytes(char *dst, size_t length, uint8_t *bytesRead)
++{
++ uint16_t rx;
++ uint8_t size;
++ uint8_t i;
++
++ memset(dst, 0, length);
++ *bytesRead = 0;
++
++ rx = spi_transfer16(0);
++ if (!(rx >> 8))
++ return -EINVAL;
++
++ size = rx & 0xff;
++
++ if (size > length)
++ return -EINVAL;
++
++ for (i = 0; i < size; ++i) {
++ rx = spi_transfer16(0);
++ if (!(rx >> 8))
++ return -EINVAL;
++
++ dst[i] = rx & 0xff;
++ }
++
++ *bytesRead = i;
++
++ return 0;
++}
++
++static int spi_device_match(struct device *dev, void *data)
++{
++ struct spi_device *spi = container_of(dev, struct spi_device, dev);
++
++ printd(" %s %s %dkHz %d bits mode=0x%02X\n",
++ spi->modalias, dev_name(dev), spi->max_speed_hz/1000,
++ spi->bits_per_word, spi->mode);
++
++ if (strcmp("pisound-spi", spi->modalias) == 0) {
++ printi("\tFound!\n");
++ return 1;
++ }
++
++ printe("\tNot found!\n");
++ return 0;
++}
++
++static struct spi_device *pisnd_spi_find_device(void)
++{
++ struct device *dev;
++
++ printi("Searching for spi device...\n");
++ dev = bus_find_device(&spi_bus_type, NULL, NULL, spi_device_match);
++ if (dev != NULL)
++ return container_of(dev, struct spi_device, dev);
++ else
++ return NULL;
++}
++
++static void pisnd_work_handler(struct work_struct *work)
++{
++ uint16_t rx;
++ uint16_t tx;
++ uint8_t val;
++
++ if (work == &pisnd_work_process) {
++ if (pisnd_spi_device == NULL)
++ return;
++
++ do {
++ val = 0;
++ tx = 0;
++
++ 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);
++
++ if (rx & 0xff00) {
++ kfifo_put(&spi_fifo_in, rx & 0xff);
++ if (kfifo_len(&spi_fifo_in) > 16
++ && g_recvCallback)
++ g_recvCallback(g_recvData);
++ }
++ } while (rx != 0
++ || !kfifo_is_empty(&spi_fifo_out)
++ || pisnd_spi_has_more()
++ || g_ledFlashDurationChanged
++ );
++
++ if (!kfifo_is_empty(&spi_fifo_in) && g_recvCallback)
++ g_recvCallback(g_recvData);
++ }
++}
++
++static int pisnd_spi_gpio_init(struct device *dev)
++{
++ spi_reset = gpiod_get_index(dev, "reset", 1, GPIOD_ASIS);
++ data_available = gpiod_get_index(dev, "data_available", 0, GPIOD_ASIS);
++
++ gpiod_direction_output(spi_reset, 1);
++ gpiod_direction_input(data_available);
++
++ /* Reset the slave. */
++ gpiod_set_value(spi_reset, false);
++ mdelay(1);
++ gpiod_set_value(spi_reset, true);
++
++ /* Give time for spi slave to start. */
++ mdelay(64);
++
++ return 0;
++}
++
++static void pisnd_spi_gpio_uninit(void)
++{
++ gpiod_set_value(spi_reset, false);
++ gpiod_put(spi_reset);
++ spi_reset = NULL;
++
++ gpiod_put(data_available);
++ data_available = NULL;
++}
++
++static int pisnd_spi_gpio_irq_init(struct device *dev)
++{
++ return request_irq(
++ gpiod_to_irq(data_available),
++ data_available_interrupt_handler,
++ IRQF_TIMER | IRQF_TRIGGER_RISING,
++ "data_available_int",
++ NULL
++ );
++}
++
++static void pisnd_spi_gpio_irq_uninit(void)
++{
++ free_irq(gpiod_to_irq(data_available), NULL);
++}
++
++static int spi_read_info(void)
++{
++ uint16_t tmp;
++ uint8_t count;
++ uint8_t n;
++ uint8_t i;
++ uint8_t j;
++ char buffer[257];
++ int ret;
++ char *p;
++
++ memset(g_serial_num, 0, sizeof(g_serial_num));
++ memset(g_version, 0, sizeof(g_version));
++ memset(g_id, 0, sizeof(g_id));
++
++ tmp = spi_transfer16(0);
++
++ if (!(tmp >> 8))
++ return -EINVAL;
++
++ count = tmp & 0xff;
++
++ for (i = 0; i < count; ++i) {
++ memset(buffer, 0, sizeof(buffer));
++ ret = spi_read_bytes(buffer, sizeof(buffer)-1, &n);
++
++ if (ret < 0)
++ return ret;
++
++ switch (i) {
++ case 0:
++ if (n != 2)
++ return -EINVAL;
++
++ snprintf(
++ g_version,
++ sizeof(g_version),
++ "%x.%02x",
++ buffer[0],
++ buffer[1]
++ );
++ break;
++ case 1:
++ if (n >= sizeof(g_serial_num))
++ return -EINVAL;
++
++ memcpy(g_serial_num, buffer, sizeof(g_serial_num));
++ break;
++ case 2:
++ {
++ if (n >= sizeof(g_id))
++ return -EINVAL;
++
++ p = g_id;
++ for (j = 0; j < n; ++j)
++ p += sprintf(p, "%02x", buffer[j]);
++ }
++ break;
++ default:
++ break;
++ }
++ }
++
++ return 0;
++}
++
++static int pisnd_spi_init(struct device *dev)
++{
++ int ret;
++ struct spi_device *spi;
++
++ memset(g_serial_num, 0, sizeof(g_serial_num));
++ memset(g_id, 0, sizeof(g_id));
++ memset(g_version, 0, sizeof(g_version));
++
++ spi = pisnd_spi_find_device();
++
++ if (spi != NULL) {
++ printd("initializing spi!\n");
++ pisnd_spi_device = spi;
++ ret = spi_setup(pisnd_spi_device);
++ } else {
++ printe("SPI device not found, deferring!\n");
++ return -EPROBE_DEFER;
++ }
++
++ ret = pisnd_spi_gpio_init(dev);
++
++ if (ret < 0) {
++ printe("SPI GPIO init failed: %d\n", ret);
++ spi_dev_put(pisnd_spi_device);
++ pisnd_spi_device = NULL;
++ pisnd_spi_gpio_uninit();
++ return ret;
++ }
++
++ ret = spi_read_info();
++
++ if (ret < 0) {
++ printe("Reading card info failed: %d\n", ret);
++ spi_dev_put(pisnd_spi_device);
++ pisnd_spi_device = NULL;
++ pisnd_spi_gpio_uninit();
++ return ret;
++ }
++
++ /* Flash the LEDs. */
++ spi_transfer16(0xf008);
++
++ ret = pisnd_spi_gpio_irq_init(dev);
++ if (ret < 0) {
++ printe("SPI irq request failed: %d\n", ret);
++ spi_dev_put(pisnd_spi_device);
++ pisnd_spi_device = NULL;
++ pisnd_spi_gpio_irq_uninit();
++ pisnd_spi_gpio_uninit();
++ }
++
++ ret = pisnd_init_workqueues();
++ if (ret != 0) {
++ printe("Workqueue initialization failed: %d\n", ret);
++ spi_dev_put(pisnd_spi_device);
++ pisnd_spi_device = NULL;
++ pisnd_spi_gpio_irq_uninit();
++ pisnd_spi_gpio_uninit();
++ pisnd_uninit_workqueues();
++ return ret;
++ }
++
++ if (pisnd_spi_has_more()) {
++ printd("data is available, scheduling from init\n");
++ pisnd_schedule_process(TASK_PROCESS);
++ }
++
++ return 0;
++}
++
++static void pisnd_spi_uninit(void)
++{
++ pisnd_uninit_workqueues();
++
++ spi_dev_put(pisnd_spi_device);
++ pisnd_spi_device = NULL;
++
++ pisnd_spi_gpio_irq_uninit();
++ 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);
++ printd("schedule from spi_send\n");
++ pisnd_schedule_process(TASK_PROCESS);
++}
++
++static uint8_t pisnd_spi_recv(uint8_t *buffer, uint8_t length)
++{
++ return kfifo_out(&spi_fifo_in, buffer, length);
++}
++
++static void pisnd_spi_set_callback(pisnd_spi_recv_cb cb, void *data)
++{
++ g_recvData = data;
++ g_recvCallback = cb;
++}
++
++static const char *pisnd_spi_get_serial(void)
++{
++ if (strlen(g_serial_num))
++ return g_serial_num;
++
++ return "";
++}
++
++static const char *pisnd_spi_get_id(void)
++{
++ if (strlen(g_id))
++ return g_id;
++
++ return "";
++}
++
++static const char *pisnd_spi_get_version(void)
++{
++ if (strlen(g_version))
++ return g_version;
++
++ return "";
++}
++
++static const struct of_device_id pisound_of_match[] = {
++ { .compatible = "blokaslabs,pisound", },
++ { .compatible = "blokaslabs,pisound-spi", },
++ {},
++};
++
++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;
++
++static int pisnd_hw_params(
++ struct snd_pcm_substream *substream,
++ 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",
++ snd_pcm_format_physical_width(params_format(params)));
++ printd("format = %d\n", params_format(params));
++
++ gpiod_set_value(reset, false);
++
++ switch (params_rate(params)) {
++ case 48000:
++ gpiod_set_value(osr0, true);
++ gpiod_set_value(osr1, false);
++ gpiod_set_value(osr2, false);
++ break;
++ case 96000:
++ gpiod_set_value(osr0, true);
++ gpiod_set_value(osr1, true);
++ gpiod_set_value(osr2, false);
++ break;
++ case 192000:
++ gpiod_set_value(osr0, true);
++ gpiod_set_value(osr1, true);
++ gpiod_set_value(osr2, true);
++ break;
++ default:
++ printe("Unsupported rate %u!\n", params_rate(params));
++ return -EINVAL;
++ }
++
++ gpiod_set_value(reset, true);
++
++ return 0;
++}
++
++static unsigned int rates[3] = {
++ 48000, 96000, 192000
++};
++
++static struct snd_pcm_hw_constraint_list constraints_rates = {
++ .count = ARRAY_SIZE(rates),
++ .list = rates,
++ .mask = 0,
++};
++
++static int pisnd_startup(struct snd_pcm_substream *substream)
++{
++ int err = snd_pcm_hw_constraint_list(
++ substream->runtime,
++ 0,
++ SNDRV_PCM_HW_PARAM_RATE,
++ &constraints_rates
++ );
++
++ if (err < 0)
++ return err;
++
++ err = snd_pcm_hw_constraint_single(
++ substream->runtime,
++ 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)
++ return err;
++
++ return 0;
++}
++
++static struct snd_soc_ops pisnd_ops = {
++ .startup = pisnd_startup,
++ .hw_params = pisnd_hw_params,
++};
++
++static struct snd_soc_dai_link pisnd_dai[] = {
++ {
++ .name = "pisound",
++ .stream_name = "pisound",
++ .cpu_dai_name = "bcm2708-i2s.0",
++ .codec_dai_name = "snd-soc-dummy-dai",
++ .platform_name = "bcm2708-i2s.0",
++ .codec_name = "snd-soc-dummy",
++ .dai_fmt =
++ SND_SOC_DAIFMT_I2S |
++ SND_SOC_DAIFMT_NB_NF |
++ SND_SOC_DAIFMT_CBM_CFM,
++ .ops = &pisnd_ops,
++ },
++};
++
++static int pisnd_card_probe(struct snd_soc_card *card)
++{
++ int err = pisnd_midi_init(card->snd_card);
++
++ if (err < 0) {
++ printe("pisnd_midi_init failed: %d\n", 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;
++}
++
++static struct snd_soc_card pisnd_card = {
++ .name = "pisound",
++ .owner = THIS_MODULE,
++ .dai_link = pisnd_dai,
++ .num_links = ARRAY_SIZE(pisnd_dai),
++ .probe = pisnd_card_probe,
++ .remove = pisnd_card_remove,
++};
++
++static int pisnd_init_gpio(struct device *dev)
++{
++ osr0 = gpiod_get_index(dev, "osr", 0, GPIOD_ASIS);
++ osr1 = gpiod_get_index(dev, "osr", 1, GPIOD_ASIS);
++ osr2 = gpiod_get_index(dev, "osr", 2, GPIOD_ASIS);
++
++ reset = gpiod_get_index(dev, "reset", 0, GPIOD_ASIS);
++
++ button = gpiod_get_index(dev, "button", 0, GPIOD_ASIS);
++
++ gpiod_direction_output(osr0, 1);
++ gpiod_direction_output(osr1, 1);
++ gpiod_direction_output(osr2, 1);
++ gpiod_direction_output(reset, 1);
++
++ gpiod_set_value(reset, false);
++ gpiod_set_value(osr0, true);
++ gpiod_set_value(osr1, false);
++ gpiod_set_value(osr2, false);
++ gpiod_set_value(reset, true);
++
++ gpiod_export(button, false);
++
++ return 0;
++}
++
++static int pisnd_uninit_gpio(void)
++{
++ int i;
++
++ struct gpio_desc **gpios[] = {
++ &osr0, &osr1, &osr2, &reset, &button,
++ };
++
++ gpiod_unexport(button);
++
++ for (i = 0; i < ARRAY_SIZE(gpios); ++i) {
++ if (*gpios[i] == NULL) {
++ printd("weird, GPIO[%d] is NULL already\n", i);
++ continue;
++ }
++
++ gpiod_put(*gpios[i]);
++ *gpios[i] = NULL;
++ }
++
++ return 0;
++}
++
++static struct kobject *pisnd_kobj;
++
++static ssize_t pisnd_serial_show(
++ struct kobject *kobj,
++ struct kobj_attribute *attr,
++ char *buf
++ )
++{
++ return sprintf(buf, "%s\n", pisnd_spi_get_serial());
++}
++
++static ssize_t pisnd_id_show(
++ struct kobject *kobj,
++ struct kobj_attribute *attr,
++ char *buf
++ )
++{
++ return sprintf(buf, "%s\n", pisnd_spi_get_id());
++}
++
++static ssize_t pisnd_version_show(
++ struct kobject *kobj,
++ struct kobj_attribute *attr,
++ char *buf
++ )
++{
++ 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, 0444, pisnd_serial_show, NULL);
++static struct kobj_attribute pisnd_id_attribute =
++ __ATTR(id, 0444, pisnd_id_show, NULL);
++static struct kobj_attribute pisnd_version_attribute =
++ __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
++};
++
++static struct attribute_group attr_group = { .attrs = attrs };
++
++static int pisnd_probe(struct platform_device *pdev)
++{
++ int ret = 0;
++ int i;
++
++ ret = pisnd_spi_init(&pdev->dev);
++ if (ret < 0) {
++ printe("pisnd_spi_init failed: %d\n", ret);
++ return ret;
++ }
++
++ printi("Detected pisound card:\n");
++ printi("\tSerial: %s\n", pisnd_spi_get_serial());
++ printi("\tVersion: %s\n", pisnd_spi_get_version());
++ printi("\tId: %s\n", pisnd_spi_get_id());
++
++ pisnd_kobj = kobject_create_and_add("pisound", kernel_kobj);
++ if (!pisnd_kobj) {
++ pisnd_spi_uninit();
++ return -ENOMEM;
++ }
++
++ ret = sysfs_create_group(pisnd_kobj, &attr_group);
++ if (ret < 0) {
++ pisnd_spi_uninit();
++ kobject_put(pisnd_kobj);
++ return -ENOMEM;
++ }
++
++ pisnd_init_gpio(&pdev->dev);
++ pisnd_card.dev = &pdev->dev;
++
++ if (pdev->dev.of_node) {
++ struct device_node *i2s_node;
++
++ i2s_node = of_parse_phandle(
++ pdev->dev.of_node,
++ "i2s-controller",
++ 0
++ );
++
++ for (i = 0; i < pisnd_card.num_links; ++i) {
++ struct snd_soc_dai_link *dai = &pisnd_dai[i];
++
++ if (i2s_node) {
++ dai->cpu_dai_name = NULL;
++ dai->cpu_of_node = i2s_node;
++ dai->platform_name = NULL;
++ dai->platform_of_node = i2s_node;
++ dai->stream_name = pisnd_spi_get_serial();
++ }
++ }
++ }
++
++ ret = snd_soc_register_card(&pisnd_card);
++
++ if (ret < 0) {
++ if (ret != -EPROBE_DEFER)
++ printe("snd_soc_register_card() failed: %d\n", ret);
++ pisnd_uninit_gpio();
++ kobject_put(pisnd_kobj);
++ pisnd_spi_uninit();
++ }
++
++ return ret;
++}
++
++static int pisnd_remove(struct platform_device *pdev)
++{
++ printi("Unloading.\n");
++
++ if (pisnd_kobj) {
++ kobject_put(pisnd_kobj);
++ pisnd_kobj = NULL;
++ }
++
++ pisnd_spi_uninit();
++
++ /* Turn off */
++ gpiod_set_value(reset, false);
++ pisnd_uninit_gpio();
++
++ return snd_soc_unregister_card(&pisnd_card);
++}
++
++MODULE_DEVICE_TABLE(of, pisound_of_match);
++
++static struct platform_driver pisnd_driver = {
++ .driver = {
++ .name = "snd-rpi-pisound",
++ .owner = THIS_MODULE,
++ .of_match_table = pisound_of_match,
++ },
++ .probe = pisnd_probe,
++ .remove = pisnd_remove,
++};
++
++module_platform_driver(pisnd_driver);
++
++MODULE_AUTHOR("Giedrius Trainavicius <giedrius@blokas.io>");
++MODULE_DESCRIPTION("ASoC Driver for pisound, http://blokas.io/pisound");
++MODULE_LICENSE("GPL v2");
projects / openwrt / staging / chunkeey.git / blobdiff