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path: root/drivers/net/wireless/mediatek/mt76/eeprom.c
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Diffstat (limited to 'drivers/net/wireless/mediatek/mt76/eeprom.c')
-rw-r--r--drivers/net/wireless/mediatek/mt76/eeprom.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/drivers/net/wireless/mediatek/mt76/eeprom.c b/drivers/net/wireless/mediatek/mt76/eeprom.c
new file mode 100644
index 000000000000..530e5593765c
--- /dev/null
+++ b/drivers/net/wireless/mediatek/mt76/eeprom.c
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#include <linux/of.h>
+#include <linux/of_net.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/etherdevice.h>
+#include "mt76.h"
+
+static int
+mt76_get_of_eeprom(struct mt76_dev *dev, int len)
+{
+#if defined(CONFIG_OF) && defined(CONFIG_MTD)
+ struct device_node *np = dev->dev->of_node;
+ struct mtd_info *mtd;
+ const __be32 *list;
+ const char *part;
+ phandle phandle;
+ int offset = 0;
+ int size;
+ size_t retlen;
+ int ret;
+
+ if (!np)
+ return -ENOENT;
+
+ list = of_get_property(np, "mediatek,mtd-eeprom", &size);
+ if (!list)
+ return -ENOENT;
+
+ phandle = be32_to_cpup(list++);
+ if (!phandle)
+ return -ENOENT;
+
+ np = of_find_node_by_phandle(phandle);
+ if (!np)
+ return -EINVAL;
+
+ part = of_get_property(np, "label", NULL);
+ if (!part)
+ part = np->name;
+
+ mtd = get_mtd_device_nm(part);
+ if (IS_ERR(mtd))
+ return PTR_ERR(mtd);
+
+ if (size <= sizeof(*list))
+ return -EINVAL;
+
+ offset = be32_to_cpup(list);
+ ret = mtd_read(mtd, offset, len, &retlen, dev->eeprom.data);
+ put_mtd_device(mtd);
+ if (ret)
+ return ret;
+
+ if (retlen < len)
+ return -EINVAL;
+
+ return 0;
+#else
+ return -ENOENT;
+#endif
+}
+
+void
+mt76_eeprom_override(struct mt76_dev *dev)
+{
+#ifdef CONFIG_OF
+ struct device_node *np = dev->dev->of_node;
+ const u8 *mac;
+
+ if (!np)
+ return;
+
+ mac = of_get_mac_address(np);
+ if (mac)
+ memcpy(dev->macaddr, mac, ETH_ALEN);
+#endif
+
+ if (!is_valid_ether_addr(dev->macaddr)) {
+ eth_random_addr(dev->macaddr);
+ dev_info(dev->dev,
+ "Invalid MAC address, using random address %pM\n",
+ dev->macaddr);
+ }
+}
+EXPORT_SYMBOL_GPL(mt76_eeprom_override);
+
+int
+mt76_eeprom_init(struct mt76_dev *dev, int len)
+{
+ dev->eeprom.size = len;
+ dev->eeprom.data = devm_kzalloc(dev->dev, len, GFP_KERNEL);
+ if (!dev->eeprom.data)
+ return -ENOMEM;
+
+ return !mt76_get_of_eeprom(dev, len);
+}
+EXPORT_SYMBOL_GPL(mt76_eeprom_init);