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authorClemens Ladisch <clemens@ladisch.de>2011-12-04 22:23:59 +0100
committerClemens Ladisch <clemens@ladisch.de>2013-10-20 22:07:57 +0200
commit15a75c8bed591dd23a3d221f5ccd91843c109670 (patch)
tree0ded272107635d8c6d4f311130091790abe02fcc /sound/firewire
parent5ea4018e4321f24e8305ea8a8b0a9c3e270456ae (diff)
downloadlinux-15a75c8bed591dd23a3d221f5ccd91843c109670.tar.bz2
ALSA: dice: get rate-dependent parameters
In preparation for sample rate selection support, read the stream parameters that might change when running at different sample rates. Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Diffstat (limited to 'sound/firewire')
-rw-r--r--sound/firewire/dice.c92
1 files changed, 90 insertions, 2 deletions
diff --git a/sound/firewire/dice.c b/sound/firewire/dice.c
index 49b47ba09cdd..e6bba6d32bd8 100644
--- a/sound/firewire/dice.c
+++ b/sound/firewire/dice.c
@@ -6,10 +6,12 @@
*/
#include <linux/compat.h>
+#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/firewire.h>
#include <linux/firewire-constants.h>
+#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/mutex.h>
@@ -37,11 +39,14 @@ struct dice {
unsigned int global_offset;
unsigned int rx_offset;
unsigned int clock_caps;
+ unsigned int rx_channels[3];
+ unsigned int rx_midi_ports[3];
struct fw_address_handler notification_handler;
int owner_generation;
int dev_lock_count; /* > 0 driver, < 0 userspace */
bool dev_lock_changed;
bool global_enabled;
+ struct completion clock_accepted;
wait_queue_head_t hwdep_wait;
u32 notification_bits;
struct fw_iso_resources resources;
@@ -53,15 +58,23 @@ MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
MODULE_LICENSE("GPL v2");
static const unsigned int dice_rates[] = {
+ /* mode 0 */
[0] = 32000,
[1] = 44100,
[2] = 48000,
+ /* mode 1 */
[3] = 88200,
[4] = 96000,
+ /* mode 2 */
[5] = 176400,
[6] = 192000,
};
+static unsigned int rate_index_to_mode(unsigned int rate_index)
+{
+ return ((int)rate_index - 1) / 2;
+}
+
static void dice_lock_changed(struct dice *dice)
{
dice->dev_lock_changed = true;
@@ -264,6 +277,7 @@ static void dice_notification(struct fw_card *card, struct fw_request *request,
void *data, size_t length, void *callback_data)
{
struct dice *dice = callback_data;
+ u32 bits;
unsigned long flags;
if (tcode != TCODE_WRITE_QUADLET_REQUEST) {
@@ -274,10 +288,17 @@ static void dice_notification(struct fw_card *card, struct fw_request *request,
fw_send_response(card, request, RCODE_ADDRESS_ERROR);
return;
}
+
+ bits = be32_to_cpup(data);
+
spin_lock_irqsave(&dice->lock, flags);
- dice->notification_bits |= be32_to_cpup(data);
+ dice->notification_bits |= bits;
spin_unlock_irqrestore(&dice->lock, flags);
+
fw_send_response(card, request, RCODE_COMPLETE);
+
+ if (bits & NOTIFY_CLOCK_ACCEPTED)
+ complete(&dice->clock_accepted);
wake_up(&dice->hwdep_wait);
}
@@ -457,6 +478,26 @@ static void dice_stream_stop(struct dice *dice)
fw_iso_resources_free(&dice->resources);
}
+static int dice_change_rate(struct dice *dice, unsigned int clock_rate)
+{
+ __be32 value;
+ int err;
+
+ INIT_COMPLETION(dice->clock_accepted);
+
+ value = cpu_to_be32(clock_rate | CLOCK_SOURCE_ARX1);
+ err = snd_fw_transaction(dice->unit, TCODE_WRITE_QUADLET_REQUEST,
+ global_address(dice, GLOBAL_CLOCK_SELECT),
+ &value, 4, 0);
+ if (err < 0)
+ return err;
+
+ wait_for_completion_timeout(&dice->clock_accepted,
+ msecs_to_jiffies(100));
+
+ return 0;
+}
+
static int dice_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
@@ -831,11 +872,51 @@ static int dice_interface_check(struct fw_unit *unit)
return 0;
}
+static int highest_supported_mode_rate(struct dice *dice, unsigned int mode)
+{
+ int i;
+
+ for (i = ARRAY_SIZE(dice_rates) - 1; i >= 0; --i)
+ if ((dice->clock_caps & (1 << i)) &&
+ rate_index_to_mode(i) == mode)
+ return i;
+
+ return -1;
+}
+
+static int dice_read_mode_params(struct dice *dice, unsigned int mode)
+{
+ __be32 values[2];
+ int rate_index, err;
+
+ rate_index = highest_supported_mode_rate(dice, mode);
+ if (rate_index < 0) {
+ dice->rx_channels[mode] = 0;
+ dice->rx_midi_ports[mode] = 0;
+ return 0;
+ }
+
+ err = dice_change_rate(dice, rate_index << CLOCK_RATE_SHIFT);
+ if (err < 0)
+ return err;
+
+ err = snd_fw_transaction(dice->unit, TCODE_READ_BLOCK_REQUEST,
+ rx_address(dice, RX_NUMBER_AUDIO),
+ values, 2 * 4, 0);
+ if (err < 0)
+ return err;
+
+ dice->rx_channels[mode] = be32_to_cpu(values[0]);
+ dice->rx_midi_ports[mode] = be32_to_cpu(values[1]);
+
+ return 0;
+}
+
static int dice_read_params(struct dice *dice)
{
__be32 pointers[6];
__be32 value;
- int err;
+ int mode, err;
err = snd_fw_transaction(dice->unit, TCODE_READ_BLOCK_REQUEST,
DICE_PRIVATE_SPACE,
@@ -863,6 +944,12 @@ static int dice_read_params(struct dice *dice)
CLOCK_CAP_SOURCE_INTERNAL;
}
+ for (mode = 2; mode >= 0; --mode) {
+ err = dice_read_mode_params(dice, mode);
+ if (err < 0)
+ return err;
+ }
+
return 0;
}
@@ -922,6 +1009,7 @@ static int dice_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
spin_lock_init(&dice->lock);
mutex_init(&dice->mutex);
dice->unit = unit;
+ init_completion(&dice->clock_accepted);
init_waitqueue_head(&dice->hwdep_wait);
dice->notification_handler.length = 4;