[PATCH] Add 93cx6 eeprom library

This patch adds a library for reading from 93cx6 eeproms.

Signed-off-by: Michael Wu <flamingice@sourmilk.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 72 insertions, 0 deletions

diff --git a/include/linux/eeprom_93cx6.h b/include/linux/eeprom_93cx6.h
new file mode 100644
index 00000000000..d774b7778c9
--- /dev/null
+++ b/include/linux/eeprom_93cx6.h
@@ -0,0 +1,72 @@
+/*
+	Copyright (C) 2004 - 2006 rt2x00 SourceForge Project
+	<http://rt2x00.serialmonkey.com>
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; either version 2 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program; if not, write to the
+	Free Software Foundation, Inc.,
+	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+/*
+	Module: eeprom_93cx6
+	Abstract: EEPROM reader datastructures for 93cx6 chipsets.
+	Supported chipsets: 93c46 & 93c66.
+ */
+
+/*
+ * EEPROM operation defines.
+ */
+#define PCI_EEPROM_WIDTH_93C46	6
+#define PCI_EEPROM_WIDTH_93C66	8
+#define PCI_EEPROM_WIDTH_OPCODE	3
+#define PCI_EEPROM_WRITE_OPCODE	0x05
+#define PCI_EEPROM_READ_OPCODE	0x06
+#define PCI_EEPROM_EWDS_OPCODE	0x10
+#define PCI_EEPROM_EWEN_OPCODE	0x13
+
+/**
+ * struct eeprom_93cx6 - control structure for setting the commands
+ * for reading the eeprom data.
+ * @data: private pointer for the driver.
+ * @register_read(struct eeprom_93cx6 *eeprom): handler to
+ * read the eeprom register, this function should set all reg_* fields.
+ * @register_write(struct eeprom_93cx6 *eeprom): handler to
+ * write to the eeprom register by using all reg_* fields.
+ * @width: eeprom width, should be one of the PCI_EEPROM_WIDTH_* defines
+ * @reg_data_in: register field to indicate data input
+ * @reg_data_out: register field to indicate data output
+ * @reg_data_clock: register field to set the data clock
+ * @reg_chip_select: register field to set the chip select
+ *
+ * This structure is used for the communication between the driver
+ * and the eeprom_93cx6 handlers for reading the eeprom.
+ */
+struct eeprom_93cx6 {
+	void *data;
+
+	void (*register_read)(struct eeprom_93cx6 *eeprom);
+	void (*register_write)(struct eeprom_93cx6 *eeprom);
+
+	int width;
+
+	char reg_data_in;
+	char reg_data_out;
+	char reg_data_clock;
+	char reg_chip_select;
+};
+
+extern void eeprom_93cx6_read(struct eeprom_93cx6 *eeprom,
+	const u8 word, u16 *data);
+extern void eeprom_93cx6_multiread(struct eeprom_93cx6 *eeprom,
+	const u8 word, __le16 *data, const u16 words);