baylibre-acme: Dynamically check per probe config options.

PROBE_FACTOR and POWER_OFF options are advertised for all ACME probes
(channel groups) regardless of whether they actually have given capability.

Check these options in config_list() at runtime and only advertise them
for probes which support them.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

src/hardware/baylibre-acme/api.c

@@ -28,10 +28,19 @@ static const uint32_t devopts[] = {
 	SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
 };
 
-static const uint32_t devopts_cg[] = {
+/*
-	SR_CONF_PROBE_FACTOR | SR_CONF_GET | SR_CONF_SET,
+ * Currently there are two channel-group/probe options for ACME:
-	SR_CONF_POWER_OFF | SR_CONF_GET | SR_CONF_SET,
+ *   - SR_CONF_PROBE_FACTOR - allows to modify current shunt resistance
-};
+ *     calibration
+ *   - SR_CONF_POWER_OFF - allows to remotely cut-off/restore power to
+ *     measured devices
+ *
+ * They are not static - we have to check each probe's capabilities in
+ * config_list().
+ */
+#define MAX_DEVOPTS_CG		2
+#define HAS_PROBE_FACTOR	(SR_CONF_PROBE_FACTOR | SR_CONF_GET | SR_CONF_SET)
+#define HAS_POWER_OFF		(SR_CONF_POWER_OFF | SR_CONF_GET | SR_CONF_SET)
 
 #define MAX_SAMPLE_RATE 500 /* In Hz */
 
@@ -263,9 +272,10 @@ static int config_list(uint32_t key, GVariant **data,
 		       const struct sr_dev_inst *sdi,
 		       const struct sr_channel_group *cg)
 {
+	uint32_t devopts_cg[MAX_DEVOPTS_CG];
 	GVariant *gvar;
 	GVariantBuilder gvb;
-	int ret;
+	int ret, num_devopts_cg = 0;
 
 	(void)sdi;
 	(void)cg;
@@ -291,8 +301,13 @@ static int config_list(uint32_t key, GVariant **data,
 	} else {
 		switch (key) {
 		case SR_CONF_DEVICE_OPTIONS:
+			if (bl_acme_get_probe_type(cg) == PROBE_ENRG)
+				devopts_cg[num_devopts_cg++] = HAS_PROBE_FACTOR;
+			if (bl_acme_probe_has_pws(cg))
+				devopts_cg[num_devopts_cg++] = HAS_POWER_OFF;
+
 			*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
-				devopts_cg, ARRAY_SIZE(devopts_cg), sizeof(uint32_t));
+				devopts_cg, num_devopts_cg, sizeof(uint32_t));
 			break;
 		default:
 			return SR_ERR_NA;

src/hardware/baylibre-acme/protocol.c

@@ -245,6 +245,20 @@ SR_PRIV gboolean bl_acme_register_probe(struct sr_dev_inst *sdi, int type,
 	return TRUE;
 }
 
+SR_PRIV int bl_acme_get_probe_type(const struct sr_channel_group *cg)
+{
+	struct channel_group_priv *cgp = cg->priv;
+
+	return cgp->probe_type;
+}
+
+SR_PRIV int bl_acme_probe_has_pws(const struct sr_channel_group *cg)
+{
+	struct channel_group_priv *cgp = cg->priv;
+
+	return sr_gpio_getval_export(pws_info_gpios[cgp->index]);
+}
+
 /*
  * Sets path to the hwmon attribute if this channel group
  * supports shunt resistance setting. The caller has to supply
@@ -348,8 +362,7 @@ SR_PRIV int bl_acme_read_power_state(const struct sr_channel_group *cg,
 
 	cgp = cg->priv;
 
-	val = sr_gpio_getval_export(pws_info_gpios[cgp->index]);
+	if (!bl_acme_probe_has_pws(cg)) {
-	if (val != 1) {
 		sr_err("Probe has no power-switch");
 		return SR_ERR_ARG;
 	}
@@ -368,8 +381,7 @@ SR_PRIV int bl_acme_set_power_off(const struct sr_channel_group *cg,
 
 	cgp = cg->priv;
 
-	val = sr_gpio_getval_export(pws_info_gpios[cgp->index]);
+	if (!bl_acme_probe_has_pws(cg)) {
-	if (val != 1) {
 		sr_err("Probe has no power-switch");
 		return SR_ERR_ARG;
 	}

src/hardware/baylibre-acme/protocol.h

@@ -81,6 +81,9 @@ SR_PRIV gboolean bl_acme_detect_probe(unsigned int addr,
 SR_PRIV gboolean bl_acme_register_probe(struct sr_dev_inst *sdi, int type,
 					unsigned int addr, int prb_num);
 
+SR_PRIV int bl_acme_get_probe_type(const struct sr_channel_group *cg);
+SR_PRIV int bl_acme_probe_has_pws(const struct sr_channel_group *cg);
+
 SR_PRIV int bl_acme_get_shunt(const struct sr_channel_group *cg,
 			      uint64_t *shunt);
 SR_PRIV int bl_acme_set_shunt(const struct sr_channel_group *cg,