* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
+/* Note: This driver doesn't compile, analog support in sigrok is WIP. */
+
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
-#include <sigrok.h>
#include <alsa/asoundlib.h>
-#include "config.h"
+#include "sigrok.h"
+#include "sigrok-internal.h"
#define NUM_PROBES 2
#define SAMPLE_WIDTH 16
#define AUDIO_DEV "plughw:0,0"
-static int capabilities[] = {
+struct sr_analog_probe {
+ uint8_t att;
+ uint8_t res; /* Needs to be a power of 2, FIXME */
+ uint16_t val; /* Max hardware ADC width is 16bits */
+};
+
+struct sr_analog_sample {
+ uint8_t num_probes; /* Max hardware probes is 256 */
+ struct sr_analog_probe probes[];
+};
+
+static int hwcaps[] = {
SR_HWCAP_SAMPLERATE,
SR_HWCAP_LIMIT_SAMPLES,
SR_HWCAP_CONTINUOUS,
};
-static GSList *device_instances = NULL;
+/* TODO: Which probe names/numbers to use? */
+static const char *probe_names[NUM_PROBES + 1] = {
+ "0",
+ "1",
+ NULL,
+};
+
+static GSList *dev_insts = NULL;
-struct alsa {
+/* Private, per-device-instance driver context. */
+struct context {
uint64_t cur_rate;
uint64_t limit_samples;
snd_pcm_t *capture_handle;
gpointer session_id;
};
-static int hw_init(char *deviceinfo)
+static int hw_init(const char *devinfo)
{
- struct sr_device_instance *sdi;
- struct alsa *alsa;
+ struct sr_dev_inst *sdi;
+ struct context *ctx;
/* Avoid compiler warnings. */
- deviceinfo = deviceinfo;
+ (void)devinfo;
- alsa = malloc(sizeof(struct alsa));
- if (!alsa)
+ if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
+ sr_err("alsa: %s: ctx malloc failed", __func__);
return 0;
- memset(alsa, 0, sizeof(struct alsa));
+ }
- sdi = sr_device_instance_new(0, SR_ST_ACTIVE, "alsa", NULL, NULL);
- if (!sdi)
- goto free_alsa;
+ if (!(sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, "alsa", NULL, NULL))) {
+ sr_err("alsa: %s: sdi was NULL", __func__);
+ goto free_ctx;
+ }
- sdi->priv = alsa;
+ sdi->priv = ctx;
- device_instances = g_slist_append(device_instances, sdi);
+ dev_insts = g_slist_append(dev_insts, sdi);
return 1;
-free_alsa:
- free(alsa);
+
+free_ctx:
+ g_free(ctx);
return 0;
}
-static int hw_opendev(int device_index)
+static int hw_dev_open(int dev_index)
{
- struct sr_device_instance *sdi;
- struct alsa *alsa;
+ struct sr_dev_inst *sdi;
+ struct context *ctx;
int err;
- if (!(sdi = sr_get_device_instance(device_instances, device_index)))
+ if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
return SR_ERR;
- alsa = sdi->priv;
+ ctx = sdi->priv;
- err = snd_pcm_open(&alsa->capture_handle, AUDIO_DEV,
- SND_PCM_STREAM_CAPTURE, 0);
+ err = snd_pcm_open(&ctx->capture_handle, AUDIO_DEV,
+ SND_PCM_STREAM_CAPTURE, 0);
if (err < 0) {
- g_warning("cannot open audio device %s (%s)", AUDIO_DEV,
- snd_strerror(err));
+ sr_err("alsa: can't open audio device %s (%s)", AUDIO_DEV,
+ snd_strerror(err));
return SR_ERR;
}
- err = snd_pcm_hw_params_malloc(&alsa->hw_params);
+ err = snd_pcm_hw_params_malloc(&ctx->hw_params);
if (err < 0) {
- g_warning("cannot allocate hardware parameter structure (%s)",
- snd_strerror(err));
+ sr_err("alsa: can't allocate hardware parameter structure (%s)",
+ snd_strerror(err));
return SR_ERR;
}
- err = snd_pcm_hw_params_any(alsa->capture_handle, alsa->hw_params);
+ err = snd_pcm_hw_params_any(ctx->capture_handle, ctx->hw_params);
if (err < 0) {
- g_warning("cannot initialize hardware parameter structure (%s)",
- snd_strerror(err));
+ sr_err("alsa: can't initialize hardware parameter structure "
+ "(%s)", snd_strerror(err));
return SR_ERR;
}
return SR_OK;
}
-static void hw_closedev(int device_index)
+static int hw_dev_close(int dev_index)
{
- struct sr_device_instance *sdi;
- struct alsa *alsa;
-
- if (!(sdi = sr_get_device_instance(device_instances, device_index)))
- return;
- alsa = sdi->priv;
- if (!alsa)
- return;
-
- if (alsa->hw_params)
- snd_pcm_hw_params_free(alsa->hw_params);
- if (alsa->capture_handle)
- snd_pcm_close(alsa->capture_handle);
+ struct sr_dev_inst *sdi;
+ struct context *ctx;
+
+ if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
+ sr_err("alsa: %s: sdi was NULL", __func__);
+ return SR_ERR; /* TODO: SR_ERR_ARG? */
+ }
+
+ if (!(ctx = sdi->priv)) {
+ sr_err("alsa: %s: sdi->priv was NULL", __func__);
+ return SR_ERR; /* TODO: SR_ERR_ARG? */
+ }
+
+ // TODO: Return values of snd_*?
+ if (ctx->hw_params)
+ snd_pcm_hw_params_free(ctx->hw_params);
+ if (ctx->capture_handle)
+ snd_pcm_close(ctx->capture_handle);
+
+ return SR_OK;
}
-static void hw_cleanup(void)
+static int hw_cleanup(void)
{
- struct sr_device_instance *sdi;
+ struct sr_dev_inst *sdi;
+
+ if (!(sdi = sr_dev_inst_get(dev_insts, 0))) {
+ sr_err("alsa: %s: sdi was NULL", __func__);
+ return SR_ERR_BUG;
+ }
- if (!(sdi = sr_get_device_instance(device_instances, 0)))
- return;
+ sr_dev_inst_free(sdi);
- free(sdi->priv);
- sr_device_instance_free(sdi);
+ return SR_OK;
}
-static void *hw_get_device_info(int device_index, int device_info_id)
+static void *hw_dev_info_get(int dev_index, int dev_info_id)
{
- struct sr_device_instance *sdi;
- struct alsa *alsa;
+ struct sr_dev_inst *sdi;
+ struct context *ctx;
void *info = NULL;
- if (!(sdi = sr_get_device_instance(device_instances, device_index)))
+ if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
return NULL;
- alsa = sdi->priv;
+ ctx = sdi->priv;
- switch (device_info_id) {
- case SR_DI_INSTANCE:
+ switch (dev_info_id) {
+ case SR_DI_INST:
info = sdi;
break;
case SR_DI_NUM_PROBES:
info = GINT_TO_POINTER(NUM_PROBES);
break;
+ case SR_DI_PROBE_NAMES:
+ info = probe_names;
+ break;
case SR_DI_CUR_SAMPLERATE:
- info = &alsa->cur_rate;
+ info = &ctx->cur_rate;
break;
// case SR_DI_PROBE_TYPE:
// info = GINT_TO_POINTER(SR_PROBE_TYPE_ANALOG);
return info;
}
-static int hw_get_status(int device_index)
+static int hw_dev_status_get(int dev_index)
{
/* Avoid compiler warnings. */
- device_index = device_index;
+ dev_index = dev_index;
return SR_ST_ACTIVE;
}
-static int *hw_get_capabilities(void)
+static int *hw_hwcap_get_all(void)
{
- return capabilities;
+ return hwcaps;
}
-static int hw_set_configuration(int device_index, int capability, void *value)
+static int hw_dev_config_set(int dev_index, int hwcap, void *value)
{
- struct sr_device_instance *sdi;
- struct alsa *alsa;
+ struct sr_dev_inst *sdi;
+ struct context *ctx;
- if (!(sdi = sr_get_device_instance(device_instances, device_index)))
+ if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
return SR_ERR;
- alsa = sdi->priv;
+ ctx = sdi->priv;
- switch (capability) {
+ switch (hwcap) {
case SR_HWCAP_PROBECONFIG:
return SR_OK;
case SR_HWCAP_SAMPLERATE:
- alsa->cur_rate = *(uint64_t *) value;
+ ctx->cur_rate = *(uint64_t *)value;
return SR_OK;
case SR_HWCAP_LIMIT_SAMPLES:
- alsa->limit_samples = *(uint64_t *) value;
+ ctx->limit_samples = *(uint64_t *)value;
return SR_OK;
default:
return SR_ERR;
static int receive_data(int fd, int revents, void *user_data)
{
- struct sr_device_instance *sdi = user_data;
- struct alsa *alsa = sdi->priv;
+ struct sr_dev_inst *sdi = user_data;
+ struct context *ctx = sdi->priv;
struct sr_datafeed_packet packet;
- struct analog_sample *sample;
- unsigned int sample_size = sizeof(struct analog_sample) +
- (NUM_PROBES * sizeof(struct analog_probe));
+ struct sr_analog_sample *sample;
+ unsigned int sample_size = sizeof(struct sr_analog_sample) +
+ (NUM_PROBES * sizeof(struct sr_analog_probe));
char *outb;
char inb[4096];
int i, x, count;
do {
memset(inb, 0, sizeof(inb));
- count = snd_pcm_readi(alsa->capture_handle, inb,
- MIN(4096/4, alsa->limit_samples));
+ count = snd_pcm_readi(ctx->capture_handle, inb,
+ MIN(4096 / 4, ctx->limit_samples));
if (count < 1) {
- g_warning("Failed to read samples");
+ sr_err("alsa: Failed to read samples");
return FALSE;
}
- outb = malloc(sample_size * count);
- if (!outb)
+ if (!(outb = g_try_malloc(sample_size * count))) {
+ sr_err("alsa: %s: outb malloc failed", __func__);
return FALSE;
+ }
for (i = 0; i < count; i++) {
- sample = (struct analog_sample *)
+ sample = (struct sr_analog_sample *)
(outb + (i * sample_size));
sample->num_probes = NUM_PROBES;
for (x = 0; x < NUM_PROBES; x++) {
sample->probes[x].val =
- *(uint16_t *) (inb + (i * 4) + (x * 2));
+ *(uint16_t *)(inb + (i * 4) + (x * 2));
sample->probes[x].val &= ((1 << 16) - 1);
sample->probes[x].res = 16;
}
packet.unitsize = sample_size;
packet.payload = outb;
sr_session_bus(user_data, &packet);
- free(outb);
- alsa->limit_samples -= count;
+ g_free(outb);
+ ctx->limit_samples -= count;
- } while (alsa->limit_samples > 0);
+ } while (ctx->limit_samples > 0);
packet.type = SR_DF_END;
sr_session_bus(user_data, &packet);
return TRUE;
}
-static int hw_start_acquisition(int device_index, gpointer session_device_id)
+static int hw_dev_acquisition_start(int dev_index, gpointer session_dev_id)
{
- struct sr_device_instance *sdi;
- struct alsa *alsa;
+ struct sr_dev_inst *sdi;
+ struct context *ctx;
struct sr_datafeed_packet packet;
struct sr_datafeed_header header;
struct pollfd *ufds;
int count;
int err;
- if (!(sdi = sr_get_device_instance(device_instances, device_index)))
+ if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
return SR_ERR;
- alsa = sdi->priv;
+ ctx = sdi->priv;
- err = snd_pcm_hw_params_set_access(alsa->capture_handle,
- alsa->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
+ err = snd_pcm_hw_params_set_access(ctx->capture_handle,
+ ctx->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
if (err < 0) {
- g_warning("cannot set access type (%s)", snd_strerror(err));
+ sr_err("alsa: can't set access type (%s)", snd_strerror(err));
return SR_ERR;
}
/* FIXME: Hardcoded for 16bits */
- err = snd_pcm_hw_params_set_format(alsa->capture_handle,
- alsa->hw_params, SND_PCM_FORMAT_S16_LE);
+ err = snd_pcm_hw_params_set_format(ctx->capture_handle,
+ ctx->hw_params, SND_PCM_FORMAT_S16_LE);
if (err < 0) {
- g_warning("cannot set sample format (%s)", snd_strerror(err));
+ sr_err("alsa: can't set sample format (%s)", snd_strerror(err));
return SR_ERR;
}
- err = snd_pcm_hw_params_set_rate_near(alsa->capture_handle,
- alsa->hw_params, (unsigned int *) &alsa->cur_rate, 0);
+ err = snd_pcm_hw_params_set_rate_near(ctx->capture_handle,
+ ctx->hw_params, (unsigned int *)&ctx->cur_rate, 0);
if (err < 0) {
- g_warning("cannot set sample rate (%s)", snd_strerror(err));
+ sr_err("alsa: can't set sample rate (%s)", snd_strerror(err));
return SR_ERR;
}
- err = snd_pcm_hw_params_set_channels(alsa->capture_handle,
- alsa->hw_params, NUM_PROBES);
+ err = snd_pcm_hw_params_set_channels(ctx->capture_handle,
+ ctx->hw_params, NUM_PROBES);
if (err < 0) {
- g_warning("cannot set channel count (%s)", snd_strerror(err));
+ sr_err("alsa: can't set channel count (%s)", snd_strerror(err));
return SR_ERR;
}
- err = snd_pcm_hw_params(alsa->capture_handle, alsa->hw_params);
+ err = snd_pcm_hw_params(ctx->capture_handle, ctx->hw_params);
if (err < 0) {
- g_warning("cannot set parameters (%s)", snd_strerror(err));
+ sr_err("alsa: can't set parameters (%s)", snd_strerror(err));
return SR_ERR;
}
- err = snd_pcm_prepare(alsa->capture_handle);
+ err = snd_pcm_prepare(ctx->capture_handle);
if (err < 0) {
- g_warning("cannot prepare audio interface for use (%s)",
- snd_strerror(err));
+ sr_err("alsa: can't prepare audio interface for use (%s)",
+ snd_strerror(err));
return SR_ERR;
}
- count = snd_pcm_poll_descriptors_count(alsa->capture_handle);
+ count = snd_pcm_poll_descriptors_count(ctx->capture_handle);
if (count < 1) {
- g_warning("Unable to obtain poll descriptors count");
+ sr_err("alsa: Unable to obtain poll descriptors count");
return SR_ERR;
}
- ufds = malloc(count * sizeof(struct pollfd));
- if (!ufds)
+ if (!(ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
+ sr_err("alsa: %s: ufds malloc failed", __func__);
return SR_ERR_MALLOC;
+ }
- err = snd_pcm_poll_descriptors(alsa->capture_handle, ufds, count);
+ err = snd_pcm_poll_descriptors(ctx->capture_handle, ufds, count);
if (err < 0) {
- g_warning("Unable to obtain poll descriptors (%s)",
- snd_strerror(err));
- free(ufds);
+ sr_err("alsa: Unable to obtain poll descriptors (%s)",
+ snd_strerror(err));
+ g_free(ufds);
return SR_ERR;
}
- alsa->session_id = session_device_id;
+ ctx->session_id = session_dev_id;
sr_source_add(ufds[0].fd, ufds[0].events, 10, receive_data, sdi);
packet.type = SR_DF_HEADER;
packet.length = sizeof(struct sr_datafeed_header);
- packet.payload = (unsigned char *) &header;
+ packet.payload = (unsigned char *)&header;
header.feed_version = 1;
gettimeofday(&header.starttime, NULL);
- header.samplerate = alsa->cur_rate;
+ header.samplerate = ctx->cur_rate;
header.num_analog_probes = NUM_PROBES;
header.num_logic_probes = 0;
header.protocol_id = SR_PROTO_RAW;
- sr_session_bus(session_device_id, &packet);
- free(ufds);
+ sr_session_bus(session_dev_id, &packet);
+ g_free(ufds);
return SR_OK;
}
-static void hw_stop_acquisition(int device_index, gpointer session_device_id)
+static int hw_dev_acquisition_stop(int dev_index, gpointer session_dev_id)
{
/* Avoid compiler warnings. */
- device_index = device_index;
- session_device_id = session_device_id;
+ dev_index = dev_index;
+ session_dev_id = session_dev_id;
+
+ return SR_OK;
}
-struct sr_device_plugin alsa_plugin_info = {
- "alsa",
- "ALSA driver",
- 1,
- hw_init,
- hw_cleanup,
- hw_opendev,
- hw_closedev,
- hw_get_device_info,
- hw_get_status,
- hw_get_capabilities,
- hw_set_configuration,
- hw_start_acquisition,
- hw_stop_acquisition,
+SR_PRIV struct sr_dev_plugin alsa_plugin_info = {
+ .name = "alsa",
+ .longname = "ALSA driver",
+ .api_version = 1,
+ .init = hw_init,
+ .cleanup = hw_cleanup,
+ .dev_open = hw_dev_open,
+ .dev_close = hw_dev_close,
+ .dev_info_get = hw_dev_info_get,
+ .dev_status_get = hw_dev_status_get,
+ .hwcap_get_all = hw_hwcap_get_all,
+ .dev_config_set = hw_dev_config_set,
+ .dev_acquisition_start = hw_dev_acquisition_start,
+ .dev_acquisition_stop = hw_dev_acquisition_stop,
};
projects / libsigrok.git / blobdiff