X-Git-Url: http://sigrok.org/gitweb/?a=blobdiff_plain;f=hardware%2Fhameg-hmo%2Fapi.c;h=4868410a00655d179260062a016815bb17a1e588;hb=8d558c7a9fd96f60077fc2b176576846f5089110;hp=8f76e65a8d29644e65bf91a16bdd12860ecb5a4d;hpb=06a3e78adb41974ed759b39812ba1f83fd21a5aa;p=libsigrok.git

diff --git a/hardware/hameg-hmo/api.c b/hardware/hameg-hmo/api.c
index 8f76e65a..4868410a 100644
--- a/hardware/hameg-hmo/api.c
+++ b/hardware/hameg-hmo/api.c
@@ -17,29 +17,218 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <stdlib.h>
+#include <glib/gstdio.h>
 #include "protocol.h"
 
-SR_PRIV struct sr_dev_driver hameg_hmo_driver_info;
-static struct sr_dev_driver *di = &hameg_hmo_driver_info;
+#define SERIALCOMM "115200/8n1/flow=1"
+
+static const int32_t hwopts[] = {
+	SR_CONF_CONN,
+	SR_CONF_SERIALCOMM,
+};
+
+struct usb_id_info {
+	uint16_t vendor_id;
+	uint16_t product_id;
+};
+
+static struct usb_id_info ho_models[] = {
+	{ 0x0403, 0xed72 }, /* HO720 */
+	{ 0x0403, 0xed73 }, /* HO730 */
+};
+
+enum {
+	PG_INVALID = -1,
+	PG_NONE,
+	PG_ANALOG,
+	PG_DIGITAL,
+};
 
 static int init(struct sr_context *sr_ctx)
 {
 	return std_init(sr_ctx, di, LOG_PREFIX);
 }
 
-static GSList *scan(GSList *options)
+/**
+ * Find USB serial devices via the USB vendor ID and product ID.
+ *
+ * @param vendor_id Vendor ID of the USB device.
+ * @param product_id Product ID of the USB device.
+ *
+ * @return A GSList of strings containing the path of the serial device or
+ *         NULL if no serial device is found. The returned list must be freed
+ *         by the caller.
+ */
+static GSList *auto_find_usb(uint16_t vendor_id, uint16_t product_id)
 {
-	struct drv_context *drvc;
-	GSList *devices;
+#ifdef __linux__
+	const gchar *usb_dev;
+	const char device_tree[] = "/sys/bus/usb/devices/";
+	GDir *devices_dir, *device_dir;
+	GSList *l = NULL;
+	GSList *tty_devs;
+	GSList *matched_paths;
+	FILE *fd;
+	char tmp[5];
+	gchar *vendor_path, *product_path, *path_copy;
+	gchar *prefix, *subdir_path, *device_path, *tty_path;
+	unsigned long read_vendor_id, read_product_id;
+	const char *file;
+
+	l = NULL;
+	tty_devs = NULL;
+	matched_paths = NULL;
+
+	if (!(devices_dir = g_dir_open(device_tree, 0, NULL)))
+		return NULL;
+
+	/*
+	 * Find potential candidates using the vendor ID and product ID
+	 * and store them in matched_paths.
+	 */
+	while ((usb_dev = g_dir_read_name(devices_dir))) {
+		vendor_path = g_strconcat(device_tree,
+					  usb_dev, "/idVendor", NULL);
+		product_path = g_strconcat(device_tree,
+					   usb_dev, "/idProduct", NULL);
+
+		if (!g_file_test(vendor_path, G_FILE_TEST_EXISTS) ||
+		    !g_file_test(product_path, G_FILE_TEST_EXISTS))
+			goto skip_device;
+
+		if ((fd = g_fopen(vendor_path, "r")) == NULL)
+			goto skip_device;
+
+		if (fgets(tmp, sizeof(tmp), fd) == NULL) {
+			fclose(fd);
+			goto skip_device;
+		}
+		read_vendor_id = strtoul(tmp, NULL, 16);
+
+		fclose(fd);
+
+		if ((fd = g_fopen(product_path, "r")) == NULL)
+			goto skip_device;
+
+		if (fgets(tmp, sizeof(tmp), fd) == NULL) {
+			fclose(fd);
+			goto skip_device;
+		}
+		read_product_id = strtoul(tmp, NULL, 16);
+
+		fclose(fd);
+
+		if (vendor_id == read_vendor_id &&
+		    product_id == read_product_id) {
+			path_copy = g_strdup(usb_dev);
+			matched_paths = g_slist_prepend(matched_paths,
+							path_copy);
+		}
+
+skip_device:
+		g_free(vendor_path);
+		g_free(product_path);
+	}
+	g_dir_close(devices_dir);
+
+	/* For every matched device try to find a ttyUSBX subfolder. */
+	for (l = matched_paths; l; l = l->next) {
+		subdir_path = NULL;
+
+		device_path = g_strconcat(device_tree, l->data, NULL);
+
+		if (!(device_dir = g_dir_open(device_path, 0, NULL))) {
+			g_free(device_path);
+			continue;
+		}
+
+		prefix = g_strconcat(l->data, ":", NULL);
+
+		while ((file = g_dir_read_name(device_dir))) {
+			if (g_str_has_prefix(file, prefix)) {
+				subdir_path = g_strconcat(device_path,
+						"/", file, NULL);
+				break;
+			}
+		}
+		g_dir_close(device_dir);
+
+		g_free(prefix);
+		g_free(device_path);
+
+		if (subdir_path) {
+			if (!(device_dir = g_dir_open(subdir_path, 0, NULL))) {
+				g_free(subdir_path);
+				continue;
+			}
+			g_free(subdir_path);
+
+			while ((file = g_dir_read_name(device_dir))) {
+				if (g_str_has_prefix(file, "ttyUSB")) {
+					tty_path = g_strconcat("/dev/",
+							       file, NULL);
+					sr_dbg("Found USB device %04x:%04x attached to %s.",
+					       vendor_id, product_id, tty_path);
+					tty_devs = g_slist_prepend(tty_devs,
+							tty_path);
+					break;
+				}
+			}
+			g_dir_close(device_dir);
+		}
+	}
+	g_slist_free_full(matched_paths, g_free);
 
-	(void)options;
+	return tty_devs;
+#else
+	return NULL;
+#endif
+}
 
+static GSList *scan(GSList *options)
+{
+	GSList *devices;
+	struct drv_context *drvc;
+	struct sr_dev_inst *sdi;
+	const char *serial_device, *serial_options;
+	GSList *l, *tty_devs;
+	unsigned int i;
+
+	serial_device = NULL;
+	serial_options = SERIALCOMM;
+	sdi = NULL;
 	devices = NULL;
 	drvc = di->priv;
 	drvc->instances = NULL;
 
-	/* TODO: scan for devices, either based on a SR_CONF_CONN option
-	 * or on a USB scan. */
+	if (sr_serial_extract_options(options, &serial_device,
+				      &serial_options) == SR_OK) {
+		sdi = hmo_probe_serial_device(serial_device, serial_options);
+		if (sdi != NULL) {
+			devices = g_slist_append(devices, sdi);
+			drvc->instances = g_slist_append(drvc->instances, sdi);
+		}
+	} else {
+		tty_devs = NULL;
+
+		for (i = 0; i < ARRAY_SIZE(ho_models); i++) {
+			if ((l = auto_find_usb(ho_models[i].vendor_id,
+					   ho_models[i].product_id)) == NULL)
+				continue;
+			tty_devs = g_slist_concat(tty_devs, l);
+		}
+
+		for (l = tty_devs; l; l = l->next) {
+			sdi = hmo_probe_serial_device(l->data, serial_options);
+			if (sdi != NULL) {
+				devices = g_slist_append(devices, sdi);
+				drvc->instances = g_slist_append(drvc->instances, sdi);
+			}
+		}
+
+		g_slist_free_full(tty_devs, g_free);
+	}
 
 	return devices;
 }
@@ -49,16 +238,44 @@ static GSList *dev_list(void)
 	return ((struct drv_context *)(di->priv))->instances;
 }
 
+static void clear_helper(void *priv)
+{
+	unsigned int i;
+	struct dev_context *devc;
+	struct scope_config *model;
+
+	devc = priv;
+	model = devc->model_config;
+
+	hmo_scope_state_free(devc->model_state);
+
+	for (i = 0; i < model->analog_channels; ++i)
+		g_slist_free(devc->analog_groups[i].probes);
+
+	for (i = 0; i < model->digital_pods; ++i) {
+		g_slist_free(devc->digital_groups[i].probes);
+		g_free(devc->digital_groups[i].name);
+	}
+
+	g_free(devc->analog_groups);
+	g_free(devc->digital_groups);
+
+	g_free(devc);
+}
+
 static int dev_clear(void)
 {
-	return std_dev_clear(di, NULL);
+	return std_dev_clear(di, clear_helper);
 }
 
 static int dev_open(struct sr_dev_inst *sdi)
 {
-	(void)sdi;
+	if (sdi->status != SR_ST_ACTIVE &&
+	    serial_open(sdi->conn, SERIAL_RDWR | SERIAL_NONBLOCK) != SR_OK)
+		return SR_ERR;
 
-	/* TODO: get handle from sdi->conn and open it. */
+	if (hmo_scope_state_get(sdi) != SR_OK)
+		return SR_ERR;
 
 	sdi->status = SR_ST_ACTIVE;
 
@@ -67,9 +284,10 @@ static int dev_open(struct sr_dev_inst *sdi)
 
 static int dev_close(struct sr_dev_inst *sdi)
 {
-	(void)sdi;
+	if (sdi->status == SR_ST_INACTIVE)
+		return SR_OK;
 
-	/* TODO: get handle from sdi->conn and close it. */
+	serial_close(sdi->conn);
 
 	sdi->status = SR_ST_INACTIVE;
 
@@ -80,94 +298,524 @@ static int cleanup(void)
 {
 	dev_clear();
 
-	/* TODO: free other driver resources, if any. */
-
 	return SR_OK;
 }
 
-static int config_get(int key, GVariant **data, const struct sr_dev_inst *sdi)
+static int check_probe_group(struct dev_context *devc,
+			     const struct sr_probe_group *probe_group)
 {
-	int ret;
+	unsigned int i;
+	struct scope_config *model;
+
+	model = devc->model_config;
+
+	if (!probe_group)
+		return PG_NONE;
 
-	(void)sdi;
-	(void)data;
+	for (i = 0; i < model->analog_channels; ++i)
+		if (probe_group == &devc->analog_groups[i])
+			return PG_ANALOG;
+
+	for (i = 0; i < model->digital_pods; ++i)
+		if (probe_group == &devc->digital_groups[i])
+			return PG_DIGITAL;
+
+	sr_err("Invalid probe group specified.");
+
+	return PG_INVALID;
+}
+
+static int config_get(int key, GVariant **data, const struct sr_dev_inst *sdi,
+		      const struct sr_probe_group *probe_group)
+{
+	int ret, pg_type;
+	unsigned int i;
+	struct dev_context *devc;
+	struct scope_config *model;
+
+	if (!sdi || !(devc = sdi->priv))
+		return SR_ERR_ARG;
+
+	if ((pg_type = check_probe_group(devc, probe_group)) == PG_INVALID)
+		return SR_ERR;
+
+	ret = SR_ERR_NA;
+	model = devc->model_config;
 
-	ret = SR_OK;
 	switch (key) {
-	/* TODO */
+	case SR_CONF_NUM_TIMEBASE:
+		*data = g_variant_new_int32(model->num_xdivs);
+		ret = SR_OK;
+		break;
+	case SR_CONF_NUM_VDIV:
+		if (pg_type == PG_NONE) {
+			sr_err("No probe group specified.");
+			return SR_ERR_PROBE_GROUP;
+		} else if (pg_type == PG_ANALOG) {
+			for (i = 0; i < model->analog_channels; ++i) {
+				if (probe_group != &devc->analog_groups[i])
+					continue;
+				*data = g_variant_new_int32(model->num_ydivs);
+				ret = SR_OK;
+				break;
+			}
+
+		} else {
+			ret = SR_ERR_NA;
+		}
+		break;
 	default:
-		return SR_ERR_NA;
+		ret = SR_ERR_NA;
 	}
 
 	return ret;
 }
 
-static int config_set(int key, GVariant *data, const struct sr_dev_inst *sdi)
+static GVariant *build_tuples(const uint64_t (*array)[][2], unsigned int n)
 {
-	int ret;
+	unsigned int i;
+	GVariant *rational[2];
+	GVariantBuilder gvb;
 
-	(void)data;
+	g_variant_builder_init(&gvb, G_VARIANT_TYPE_ARRAY);
 
-	if (sdi->status != SR_ST_ACTIVE)
-		return SR_ERR_DEV_CLOSED;
+	for (i = 0; i < n; i++) {
+		rational[0] = g_variant_new_uint64((*array)[i][0]);
+		rational[1] = g_variant_new_uint64((*array)[i][1]);
+
+		/* FIXME: Valgrind reports a memory leak here. */
+		g_variant_builder_add_value(&gvb, g_variant_new_tuple(rational, 2));
+	}
+
+	return g_variant_builder_end(&gvb);
+}
+
+static int config_set(int key, GVariant *data, const struct sr_dev_inst *sdi,
+		      const struct sr_probe_group *probe_group)
+{
+	int ret, pg_type;
+	unsigned int i, j;
+	char command[MAX_COMMAND_SIZE];
+	struct dev_context *devc;
+	struct scope_config *model;
+	struct scope_state *state;
+	const char *tmp;
+	uint64_t p, q, tmp_u64;
+	double tmp_d;
+
+	if (!sdi || !(devc = sdi->priv))
+		return SR_ERR_ARG;
+
+	if ((pg_type = check_probe_group(devc, probe_group)) == PG_INVALID)
+		return SR_ERR;
+
+	model = devc->model_config;
+	state = devc->model_state;
+
+	ret = SR_ERR_NA;
 
-	ret = SR_OK;
 	switch (key) {
-	/* TODO */
+	case SR_CONF_LIMIT_FRAMES:
+		devc->frame_limit = g_variant_get_uint64(data);
+		ret = SR_OK;
+		break;
+	case SR_CONF_TRIGGER_SOURCE:
+		tmp = g_variant_get_string(data, NULL);
+		for (i = 0; (*model->trigger_sources)[i]; i++) {
+			if (g_strcmp0(tmp, (*model->trigger_sources)[i]) != 0)
+				continue;
+			state->trigger_source = i;
+			g_snprintf(command, sizeof(command),
+				   (*model->scpi_dialect)[SCPI_CMD_SET_TRIGGER_SOURCE],
+				   (*model->trigger_sources)[i]);
+
+			ret = sr_scpi_send(sdi->conn, command);
+			break;
+		}
+		break;
+	case SR_CONF_VDIV:
+		if (pg_type == PG_NONE) {
+			sr_err("No probe group specified.");
+			return SR_ERR_PROBE_GROUP;
+		}
+
+		g_variant_get(data, "(tt)", &p, &q);
+
+		for (i = 0; i < model->num_vdivs; i++) {
+			if (p != (*model->vdivs)[i][0] ||
+			    q != (*model->vdivs)[i][1])
+				continue;
+			for (j = 1; j <= model->analog_channels; ++j) {
+				if (probe_group != &devc->analog_groups[j - 1])
+					continue;
+				state->analog_channels[j - 1].vdiv = (float) p / q;
+				g_snprintf(command, sizeof(command),
+					   (*model->scpi_dialect)[SCPI_CMD_SET_VERTICAL_DIV],
+					   j, state->analog_channels[j-1].vdiv);
+
+				if (sr_scpi_send(sdi->conn, command) != SR_OK ||
+				    sr_scpi_get_opc(sdi->conn) != SR_OK)
+					return SR_ERR;
+
+				break;
+			}
+
+			ret = SR_OK;
+			break;
+		}
+		break;
+	case SR_CONF_TIMEBASE:
+		g_variant_get(data, "(tt)", &p, &q);
+
+		for (i = 0; i < model->num_timebases; i++) {
+			if (p != (*model->timebases)[i][0] ||
+			    q != (*model->timebases)[i][1])
+				continue;
+			state->timebase = (float) p / q;
+			g_snprintf(command, sizeof(command),
+				   (*model->scpi_dialect)[SCPI_CMD_SET_TIMEBASE],
+				   state->timebase);
+
+			ret = sr_scpi_send(sdi->conn, command);
+			break;
+		}
+		break;
+	case SR_CONF_HORIZ_TRIGGERPOS:
+		tmp_d = g_variant_get_double(data);
+
+		if (tmp_d < 0.0 || tmp_d > 1.0)
+			return SR_ERR;
+
+		state->horiz_triggerpos = -(tmp_d - 0.5) * state->timebase * model->num_xdivs;
+		g_snprintf(command, sizeof(command),
+			   (*model->scpi_dialect)[SCPI_CMD_SET_HORIZ_TRIGGERPOS],
+			   state->horiz_triggerpos);
+
+		ret = sr_scpi_send(sdi->conn, command);
+		break;
+	case SR_CONF_TRIGGER_SLOPE:
+		tmp_u64 = g_variant_get_uint64(data);
+
+		if (tmp_u64 != 0 && tmp_u64 != 1)
+			return SR_ERR;
+
+		state->trigger_slope = tmp_u64;
+
+		g_snprintf(command, sizeof(command),
+			   (*model->scpi_dialect)[SCPI_CMD_SET_TRIGGER_SLOPE],
+			   tmp_u64 ? "POS" : "NEG");
+
+		ret = sr_scpi_send(sdi->conn, command);
+		break;
+	case SR_CONF_COUPLING:
+		if (pg_type == PG_NONE) {
+			sr_err("No probe group specified.");
+			return SR_ERR_PROBE_GROUP;
+		}
+
+		tmp = g_variant_get_string(data, NULL);
+
+		for (i = 0; (*model->coupling_options)[i]; i++) {
+			if (strcmp(tmp, (*model->coupling_options)[i]) != 0)
+				continue;
+			for (j = 1; j <= model->analog_channels; ++j) {
+				if (probe_group != &devc->analog_groups[j - 1])
+					continue;
+				state->analog_channels[j-1].coupling = i;
+
+				g_snprintf(command, sizeof(command),
+					   (*model->scpi_dialect)[SCPI_CMD_SET_COUPLING],
+					   j, tmp);
+
+				if (sr_scpi_send(sdi->conn, command) != SR_OK ||
+				    sr_scpi_get_opc(sdi->conn) != SR_OK)
+					return SR_ERR;
+				break;
+			}
+
+			ret = SR_OK;
+			break;
+		}
+		break;
 	default:
 		ret = SR_ERR_NA;
+		break;
 	}
 
+	if (ret == SR_OK)
+		ret = sr_scpi_get_opc(sdi->conn);
+
 	return ret;
 }
 
-static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
+static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi,
+		       const struct sr_probe_group *probe_group)
 {
-	int ret;
+	int pg_type;
+	struct dev_context *devc;
+	struct scope_config *model;
+
+	if (!sdi || !(devc = sdi->priv))
+		return SR_ERR_ARG;
 
-	(void)sdi;
-	(void)data;
+	if ((pg_type = check_probe_group(devc, probe_group)) == PG_INVALID)
+		return SR_ERR;
+
+	model = devc->model_config;
 
-	ret = SR_OK;
 	switch (key) {
-	/* TODO */
+	case SR_CONF_DEVICE_OPTIONS:
+		if (pg_type == PG_NONE) {
+			*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
+				model->hw_caps, model->num_hwcaps,
+				sizeof(int32_t));
+		} else if (pg_type == PG_ANALOG) {
+			*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
+				model->analog_hwcaps, model->num_analog_hwcaps,
+				sizeof(int32_t));
+		} else {
+			*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
+				NULL, 0, sizeof(int32_t));
+		}
+		break;
+	case SR_CONF_COUPLING:
+		if (pg_type == PG_NONE)
+			return SR_ERR_PROBE_GROUP;
+		*data = g_variant_new_strv(*model->coupling_options,
+			   g_strv_length((char **)*model->coupling_options));
+		break;
+	case SR_CONF_TRIGGER_SOURCE:
+		*data = g_variant_new_strv(*model->trigger_sources,
+			   g_strv_length((char **)*model->trigger_sources));
+		break;
+	case SR_CONF_TIMEBASE:
+		*data = build_tuples(model->timebases, model->num_timebases);
+		break;
+	case SR_CONF_VDIV:
+		if (pg_type == PG_NONE)
+			return SR_ERR_PROBE_GROUP;
+		*data = build_tuples(model->vdivs, model->num_vdivs);
+		break;
 	default:
 		return SR_ERR_NA;
 	}
 
-	return ret;
+	return SR_OK;
 }
 
-static int dev_acquisition_start(const struct sr_dev_inst *sdi,
-				    void *cb_data)
+SR_PRIV int hmo_request_data(const struct sr_dev_inst *sdi)
 {
-	(void)sdi;
-	(void)cb_data;
+	char command[MAX_COMMAND_SIZE];
+	struct sr_probe *probe;
+	struct dev_context *devc;
+	struct scope_config *model;
+
+	devc = sdi->priv;
+	model = devc->model_config;
+
+	probe = devc->current_probe->data;
+
+	switch (probe->type) {
+	case SR_PROBE_ANALOG:
+		g_snprintf(command, sizeof(command),
+			   (*model->scpi_dialect)[SCPI_CMD_GET_ANALOG_DATA],
+			   probe->index + 1);
+		break;
+	case SR_PROBE_LOGIC:
+		g_snprintf(command, sizeof(command),
+			   (*model->scpi_dialect)[SCPI_CMD_GET_DIG_DATA],
+			   probe->index < 8 ? 1 : 2);
+		break;
+	default:
+		sr_err("Invalid probe type.");
+		break;
+	}
+
+	return sr_scpi_send(sdi->conn, command);
+}
+
+static int hmo_check_probes(GSList *probes)
+{
+	GSList *l;
+	struct sr_probe *probe;
+	gboolean enabled_pod1, enabled_pod2, enabled_chan3, enabled_chan4;
+
+	enabled_pod1 = enabled_pod2 = enabled_chan3 = enabled_chan4 = FALSE;
+
+	for (l = probes; l; l = l->next) {
+		probe = l->data;
+		switch (probe->type) {
+		case SR_PROBE_ANALOG:
+			if (probe->index == 2)
+				enabled_chan3 = TRUE;
+			else if (probe->index == 3)
+				enabled_chan4 = TRUE;
+			break;
+		case SR_PROBE_LOGIC:
+			if (probe->index < 8)
+				enabled_pod1 = TRUE;
+			else
+				enabled_pod2 = TRUE;
+			break;
+		default:
+			return SR_ERR;
+		}
+	}
+
+	if ((enabled_pod1 && enabled_chan3) ||
+	    (enabled_pod2 && enabled_chan4))
+		return SR_ERR;
+
+	return SR_OK;
+}
+
+static int hmo_setup_probes(const struct sr_dev_inst *sdi)
+{
+	GSList *l;
+	unsigned int i;
+	gboolean *pod_enabled;
+	char command[MAX_COMMAND_SIZE];
+	struct scope_state *state;
+	struct scope_config *model;
+	struct sr_probe *probe;
+	struct dev_context *devc;
+	struct sr_serial_dev_inst *serial;
+
+	devc = sdi->priv;
+	serial = sdi->conn;
+	state = devc->model_state;
+	model = devc->model_config;
+
+	pod_enabled = g_try_malloc0(sizeof(gboolean) * model->digital_pods);
+
+	for (l = sdi->probes; l; l = l->next) {
+		probe = l->data;
+		switch (probe->type) {
+		case SR_PROBE_ANALOG:
+			if (probe->enabled == state->analog_channels[probe->index].state)
+				break;
+			g_snprintf(command, sizeof(command),
+				   (*model->scpi_dialect)[SCPI_CMD_SET_ANALOG_CHAN_STATE],
+				   probe->index + 1, probe->enabled);
+
+			if (sr_scpi_send(serial, command) != SR_OK)
+				return SR_ERR;
+			state->analog_channels[probe->index].state = probe->enabled;
+			break;
+		case SR_PROBE_LOGIC:
+			/*
+			 * A digital POD needs to be enabled for every group of
+			 * 8 probes.
+			 */
+			if (probe->enabled)
+				pod_enabled[probe->index < 8 ? 0 : 1] = TRUE;
+
+			if (probe->enabled == state->digital_channels[probe->index])
+				break;
+			g_snprintf(command, sizeof(command),
+				   (*model->scpi_dialect)[SCPI_CMD_SET_DIG_CHAN_STATE],
+				   probe->index, probe->enabled);
+
+			if (sr_scpi_send(serial, command) != SR_OK)
+				return SR_ERR;
+
+			state->digital_channels[probe->index] = probe->enabled;
+			break;
+		default:
+			return SR_ERR;
+		}
+	}
+
+	for (i = 1; i <= model->digital_pods; ++i) {
+		if (state->digital_pods[i - 1] == pod_enabled[i - 1])
+			continue;
+		g_snprintf(command, sizeof(command),
+			   (*model->scpi_dialect)[SCPI_CMD_SET_DIG_POD_STATE],
+			   i, pod_enabled[i - 1]);
+		if (sr_scpi_send(serial, command) != SR_OK)
+			return SR_ERR;
+		state->digital_pods[i - 1] = pod_enabled[i - 1];
+	}
+
+	g_free(pod_enabled);
+
+	return SR_OK;
+}
+
+static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
+{
+	GSList *l;
+	gboolean digital_added;
+	struct sr_probe *probe;
+	struct dev_context *devc;
+	struct sr_serial_dev_inst *serial;
 
 	if (sdi->status != SR_ST_ACTIVE)
 		return SR_ERR_DEV_CLOSED;
 
-	/* TODO: configure hardware, reset acquisition state, set up
-	 * callbacks and send header packet. */
+	serial = sdi->conn;
+	devc = sdi->priv;
+	digital_added = FALSE;
+
+	for (l = sdi->probes; l; l = l->next) {
+		probe = l->data;
+		if (!probe->enabled)
+			continue;
+		/* Only add a single digital probe. */
+		if (probe->type != SR_PROBE_LOGIC || !digital_added) {
+			devc->enabled_probes = g_slist_append(
+					devc->enabled_probes, probe);
+			if (probe->type == SR_PROBE_LOGIC)
+				digital_added = TRUE;
+		}
+	}
+
+	if (!devc->enabled_probes)
+		return SR_ERR;
 
-	return SR_OK;
+	if (hmo_check_probes(devc->enabled_probes) != SR_OK) {
+		sr_err("Invalid probe configuration specified!");
+		return SR_ERR_NA;
+	}
+
+	if (hmo_setup_probes(sdi) != SR_OK) {
+		sr_err("Failed to setup probe configuration!");
+		return SR_ERR;
+	}
+
+	sr_source_add(serial->fd, G_IO_IN, 50, hmo_receive_data, (void *)sdi);
+
+	/* Send header packet to the session bus. */
+	std_session_send_df_header(cb_data, LOG_PREFIX);
+
+	devc->current_probe = devc->enabled_probes;
+
+	return hmo_request_data(sdi);
 }
 
 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 {
+	struct dev_context *devc;
+	struct sr_serial_dev_inst *serial;
+
 	(void)cb_data;
 
 	if (sdi->status != SR_ST_ACTIVE)
 		return SR_ERR_DEV_CLOSED;
 
-	/* TODO: stop acquisition. */
+	devc = sdi->priv;
+
+	g_slist_free(devc->enabled_probes);
+	devc->enabled_probes = NULL;
+	serial = sdi->conn;
+	sr_source_remove(serial->fd);
 
 	return SR_OK;
 }
 
 SR_PRIV struct sr_dev_driver hameg_hmo_driver_info = {
 	.name = "hameg-hmo",
-	.longname = "Hameg HMO scope driver",
+	.longname = "Hameg HMO",
 	.api_version = 1,
 	.init = init,
 	.cleanup = cleanup,