From 2be45d43a07299fcd7a19d4cb914880c53b054de Mon Sep 17 00:00:00 2001
From: Shawn Guo <shawn.guo@linaro.org>
Date: Wed, 16 Jun 2021 16:41:00 +0800
Subject: [PATCH] brcmfmac: support read chipname via sysfs

It adds support of reading chipname via sysfs, so that user space can
distinguish WiFi module among AP5256, AP5256V and 1MW.

- AP5256
reMarkable: ~/ cat /sys/class/ieee80211/phy*/chipname
BCM4345/9

- AP5256V
reMarkable: ~/ cat /sys/class/ieee80211/phy*/chipname
BCM43012/2

- 1MW
reMarkable: ~/ cat /sys/class/ieee80211/phy*/chipname
BCM4345/6

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
 .../broadcom/brcm80211/brcmfmac/core.c        | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
index 405745c81697..8116f5c88200 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
@@ -937,6 +937,17 @@ int brcmf_fwlog_attach(struct device *dev)
 	return brcmf_debug_fwlog_init(drvr);
 }
 
+static ssize_t chipname_show(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	struct brcmf_bus *bus_if = dev_get_drvdata(dev->parent);
+	struct brcmf_pub *drvr = bus_if->drvr;
+	struct brcmf_rev_info *ri = &drvr->revinfo;
+
+	return snprintf(buf, PAGE_SIZE, "%s\n", ri->chipname);
+}
+static DEVICE_ATTR_RO(chipname);
+
 static int brcmf_revinfo_read(struct seq_file *s, void *data)
 {
 	struct brcmf_bus *bus_if = dev_get_drvdata(s->private);
@@ -1035,6 +1046,13 @@ int brcmf_bus_started(struct device *dev)
 #endif
 #endif /* CONFIG_INET */
 
+	/* Create sysfs file to get chip name */
+	ret = device_create_file(&drvr->config->wiphy->dev, &dev_attr_chipname);
+	if (ret) {
+		brcmf_err("failed to create sysfs file chipname");
+		goto fail;
+	}
+
 	return 0;
 
 fail:
@@ -1087,6 +1105,8 @@ void brcmf_detach(struct device *dev)
 	if (drvr == NULL)
 		return;
 
+	device_remove_file(&drvr->config->wiphy->dev, &dev_attr_chipname);
+
 #ifdef CONFIG_INET
 	unregister_inetaddr_notifier(&drvr->inetaddr_notifier);
 #endif