[PATCH 2/2] brcmfmac: support parse country code map from DT

[Shawn Guo <shawn.guo@xxxxxxxxxx>]

With any regulatory domain requests coming from either user space or
802.11 IE (Information Element), the country is coded in ISO3166
standard.  It needs to be translated to firmware country code and
revision with the mapping info in settings->country_codes table.
Support populate country_codes table by parsing the mapping from DT.

Signed-off-by: Shawn Guo <shawn.guo@xxxxxxxxxx>
---
 .../wireless/broadcom/brcm80211/brcmfmac/of.c | 53 +++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
index a7554265f95f..ea5c7f434c2c 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
@@ -12,12 +12,61 @@
 #include "common.h"
 #include "of.h"
 
+static int brcmf_of_get_country_codes(struct device *dev,
+				      struct brcmf_mp_device *settings)
+{
+	struct device_node *np = dev->of_node;
+	struct brcmfmac_pd_cc_entry *cce;
+	struct brcmfmac_pd_cc *cc;
+	int count;
+	int i;
+
+	count = of_property_count_strings(np, "brcm,ccode-map");
+	if (count < 0) {
+		/* The property is optional, so return success if it doesn't
+		 * exist. Otherwise propagate the error code.
+		 */
+		return (count == -EINVAL) ? 0 : count;
+	}
+
+	cc = devm_kzalloc(dev, sizeof(*cc) + count * sizeof(*cce), GFP_KERNEL);
+	if (!cc)
+		return -ENOMEM;
+
+	cc->table_size = count;
+
+	for (i = 0; i < count; i++) {
+		const char *map;
+		int ret;
+
+		cce = &cc->table[i];
+
+		if (of_property_read_string_index(np, "brcm,ccode-map",
+						  i, &map))
+			continue;
+
+		/* String format e.g. US-Q2-86 */
+		strncpy(cce->iso3166, map, 2);
+		strncpy(cce->cc, map + 3, 2);
+
+		ret = kstrtos32(map + 6, 10, &cce->rev);
+		if (ret < 0)
+			dev_warn(dev, "failed to read rev of map %s: %d",
+				 cce->iso3166, ret);
+	}
+
+	settings->country_codes = cc;
+
+	return 0;
+}
+
 void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
 		    struct brcmf_mp_device *settings)
 {
 	struct brcmfmac_sdio_pd *sdio = &settings->bus.sdio;
 	struct device_node *root, *np = dev->of_node;
 	int irq;
+	int ret;
 	u32 irqf;
 	u32 val;
 
@@ -47,6 +96,10 @@ void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
 	    !of_device_is_compatible(np, "brcm,bcm4329-fmac"))
 		return;
 
+	ret = brcmf_of_get_country_codes(dev, settings);
+	if (ret)
+		dev_warn(dev, "failed to get OF country code map\n");
+
 	if (of_property_read_u32(np, "brcm,drive-strength", &val) == 0)
 		sdio->drive_strength = val;
 
-- 
2.17.1