ALSA: isight: wrap up register accesses
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
[cl: removed superfluous variable]
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/firewire/isight.c b/sound/firewire/isight.c
index 1a8da26..4d2edcf 100644
--- a/sound/firewire/isight.c
+++ b/sound/firewire/isight.c
@@ -5,6 +5,7 @@
* Licensed under the terms of the GNU General Public License, version 2.
*/
+#include <asm/byteorder.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/firewire.h>
@@ -311,23 +312,28 @@
return 0;
}
+static int reg_read(struct isight *isight, int offset, __be32 *value)
+{
+ return snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
+ isight->audio_base + offset, value, 4);
+}
+
+static int reg_write(struct isight *isight, int offset, __be32 value)
+{
+ return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
+ isight->audio_base + offset, &value, 4);
+}
+
static void isight_stop_streaming(struct isight *isight)
{
- __be32 value;
-
if (!isight->context)
return;
fw_iso_context_stop(isight->context);
fw_iso_context_destroy(isight->context);
isight->context = NULL;
-
- value = 0;
- snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
- isight->audio_base + REG_AUDIO_ENABLE,
- &value, 4);
-
fw_iso_resources_free(&isight->resources);
+ reg_write(isight, REG_AUDIO_ENABLE, 0);
}
static int isight_hw_free(struct snd_pcm_substream *substream)
@@ -345,7 +351,6 @@
static int isight_start_streaming(struct isight *isight)
{
- __be32 value;
unsigned int i;
int err;
@@ -356,21 +361,15 @@
return 0;
}
- value = cpu_to_be32(RATE_48000);
- err = snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
- isight->audio_base + REG_SAMPLE_RATE,
- &value, 4);
+ err = reg_write(isight, REG_SAMPLE_RATE, cpu_to_be32(RATE_48000));
if (err < 0)
- return err;
+ goto error;
err = isight_connect(isight);
if (err < 0)
goto error;
- value = cpu_to_be32(AUDIO_ENABLE);
- err = snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
- isight->audio_base + REG_AUDIO_ENABLE,
- &value, 4);
+ err = reg_write(isight, REG_AUDIO_ENABLE, cpu_to_be32(AUDIO_ENABLE));
if (err < 0)
goto err_resources;
@@ -407,11 +406,8 @@
fw_iso_context_destroy(isight->context);
isight->context = NULL;
err_resources:
- value = 0;
- snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
- isight->audio_base + REG_AUDIO_ENABLE,
- &value, 4);
fw_iso_resources_free(&isight->resources);
+ reg_write(isight, REG_AUDIO_ENABLE, 0);
error:
return err;
}
@@ -503,8 +499,7 @@
__be32 gain;
int err;
- err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
- isight->audio_base + REG_GAIN, &gain, 4);
+ err = reg_read(isight, REG_GAIN, &gain);
if (err < 0)
return err;
@@ -517,15 +512,13 @@
struct snd_ctl_elem_value *value)
{
struct isight *isight = ctl->private_data;
- __be32 gain;
if (value->value.integer.value[0] < isight->gain_min ||
value->value.integer.value[0] > isight->gain_max)
return -EINVAL;
- gain = cpu_to_be32(value->value.integer.value[0]);
- return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
- isight->audio_base + REG_GAIN, &gain, 4);
+ return reg_write(isight, REG_GAIN,
+ cpu_to_be32(value->value.integer.value[0]));
}
static int isight_mute_get(struct snd_kcontrol *ctl,
@@ -535,8 +528,7 @@
__be32 mute;
int err;
- err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
- isight->audio_base + REG_MUTE, &mute, 4);
+ err = reg_read(isight, REG_MUTE, &mute);
if (err < 0)
return err;
@@ -549,11 +541,9 @@
struct snd_ctl_elem_value *value)
{
struct isight *isight = ctl->private_data;
- __be32 mute;
- mute = (__force __be32)!value->value.integer.value[0];
- return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
- isight->audio_base + REG_MUTE, &mute, 4);
+ return reg_write(isight, REG_MUTE,
+ (__force __be32)!value->value.integer.value[0]);
}
static int isight_create_mixer(struct isight *isight)
@@ -578,31 +568,25 @@
struct snd_kcontrol *ctl;
int err;
- err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
- isight->audio_base + REG_GAIN_RAW_START,
- &value, 4);
+ err = reg_read(isight, REG_GAIN_RAW_START, &value);
if (err < 0)
return err;
isight->gain_min = be32_to_cpu(value);
- err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
- isight->audio_base + REG_GAIN_RAW_END,
- &value, 4);
+ err = reg_read(isight, REG_GAIN_RAW_END, &value);
if (err < 0)
return err;
isight->gain_max = be32_to_cpu(value);
isight->gain_tlv[0] = SNDRV_CTL_TLVT_DB_MINMAX;
isight->gain_tlv[1] = 2 * sizeof(unsigned int);
- err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
- isight->audio_base + REG_GAIN_DB_START,
- &value, 4);
+
+ err = reg_read(isight, REG_GAIN_DB_START, &value);
if (err < 0)
return err;
isight->gain_tlv[2] = (s32)be32_to_cpu(value) * 100;
- err = snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
- isight->audio_base + REG_GAIN_DB_END,
- &value, 4);
+
+ err = reg_read(isight, REG_GAIN_DB_END, &value);
if (err < 0)
return err;
isight->gain_tlv[3] = (s32)be32_to_cpu(value) * 100;