drivers: ieee802154: cc1200: SUN-FSK compatibility

Preparative change to introduce build-time configured channel pages.
This fixes the description of the driver's available PHYs and makes
channel page and channel range independent from runtime attributes.

Signed-off-by: Florian Grandel <fgrandel@code-for-humans.de>

drivers/ieee802154/Kconfig.cc1200

@@ -85,13 +85,22 @@ choice
 	  Set the RF preset you want to use.
 
 config IEEE802154_CC1200_RF_SET_0
-	bool "868MHz - 50Kbps - 2-GFSK - IEEE 802.15.4g compliant - ETSI"
+	bool "IEEE 802.15.4g SUN MR-FSK, 863MHz band, mode #1 - channel page 9, 34 channels, 50Kbps (ETSI)"
+	help
+	   This is a legacy IEEE 802.15.4g-2012 SUN MR-FSK PHY that does no
+	   longer exist in recent standards (IEEE 802.15.4-2015+).
 
 config IEEE802154_CC1200_RF_SET_1
-	bool "920MHz - 50Kbps - 2-GFSK - IEEE 802.15.4g compliant - ARIB"
+	bool "IEEE 802.15.4g SUN MR-FSK 920MHz band, mode #1 - channel page 9, 39 channels, 50Kbps (ARIB)"
+	help
+	   This is a legacy IEEE 802.15.4g-2012 SUN MR-FSK PHY that does no
+	   longer exist in recent standards (IEEE 802.15.4-2015+).
 
 config IEEE802154_CC1200_RF_SET_2
-	bool "434MHz - 50Kbps - 2-GFSK - IEEE 802.15.4g compliant - ETSI"
+	bool "IEEE 802.15.4 Non-Standard 2-GFSK 433MHz band - channel page 9, 15 channels, 50Kbps (ETSI)"
+	help
+	   This is a non-standard PHY similar to the IEEE 802.15.4g-2012 SUN
+	   MR-FSK PHY but not in one of the standard bands.
 
 endchoice
 

drivers/ieee802154/ieee802154_cc1200.c

@@ -543,6 +543,15 @@ static int cc1200_cca(const struct device *dev)
 static int cc1200_set_channel(const struct device *dev, uint16_t channel)
 {
 	struct cc1200_context *cc1200 = dev->data;
+	uint32_t freq;
+
+	/* As SUN FSK provides a host of configurations with extremely different
+	 * channel counts it doesn't make sense to validate (aka -EINVAL) a
+	 * global upper limit on the number of supported channels on this page.
+	 */
+	if (channel > IEEE802154_CC1200_CHANNEL_LIMIT) {
+		return -ENOTSUP;
+	}
 
 	/* Unlike usual 15.4 chips, cc1200 is closer to a bare metal radio modem
 	 * and thus does not provide any means to select a channel directly, but
@@ -552,14 +561,16 @@ static int cc1200_set_channel(const struct device *dev, uint16_t channel)
 	 * See rf_evaluate_freq_setting() above.
 	 */
 
-	if (atomic_get(&cc1200->rx) == 0) {
+	if (atomic_get(&cc1200->rx) != 0) {
-		uint32_t freq = rf_evaluate_freq_setting(dev, channel);
+		return -EIO;
+	}
 
-		if (!write_reg_freq(dev, freq) ||
+	freq = rf_evaluate_freq_setting(dev, channel);
-		    rf_calibrate(dev)) {
+
-			LOG_ERR("Could not set channel %u", channel);
+	if (!write_reg_freq(dev, freq) ||
-			return -EIO;
+		rf_calibrate(dev)) {
-		}
+		LOG_ERR("Could not set channel %u", channel);
+		return -EIO;
 	}
 
 	return 0;

drivers/ieee802154/ieee802154_cc1200_rf.h

@@ -23,9 +23,10 @@
 
 #if defined(CONFIG_IEEE802154_CC1200_RF_SET_0)
 
+#define IEEE802154_CC1200_CHANNEL_LIMIT 33
+
 const struct cc1200_rf_registers_set cc1200_rf_settings = {
 	.chan_center_freq0 = 863125,
-	.channel_limit = 33,
 	.channel_spacing = 2000, /* 200 KHz */
 	.registers = {
 		0x6F, /* SYNC3 */
@@ -133,9 +134,10 @@ const struct cc1200_rf_registers_set cc1200_rf_settings = {
 
 #elif defined(CONFIG_IEEE802154_CC1200_RF_SET_1)
 
+#define IEEE802154_CC1200_CHANNEL_LIMIT 38
+
 const struct cc1200_rf_registers_set cc1200_rf_settings = {
 	.chan_center_freq0 = 920600,
-	.channel_limit = 38,
 	.channel_spacing = 2000, /* 200 KHz */
 	.registers = {
 		0x6F, /* SYNC3 */
@@ -243,9 +245,10 @@ const struct cc1200_rf_registers_set cc1200_rf_settings = {
 
 #elif defined(CONFIG_IEEE802154_CC1200_RF_SET_2)
 
+#define IEEE802154_CC1200_CHANNEL_LIMIT 14
+
 const struct cc1200_rf_registers_set cc1200_rf_settings = {
 	.chan_center_freq0 = 433164,
-	.channel_limit = 14,
 	.channel_spacing = 2000, /* 200 KHz */
 	.registers = {
 		0x6F, /* SYNC3 */