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path: root/drivers/staging/media/solo6x10/solo6x10-eeprom.c
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Diffstat (limited to 'drivers/staging/media/solo6x10/solo6x10-eeprom.c')
-rw-r--r--drivers/staging/media/solo6x10/solo6x10-eeprom.c154
1 files changed, 154 insertions, 0 deletions
diff --git a/drivers/staging/media/solo6x10/solo6x10-eeprom.c b/drivers/staging/media/solo6x10/solo6x10-eeprom.c
new file mode 100644
index 00000000000..9d1c9bb53d6
--- /dev/null
+++ b/drivers/staging/media/solo6x10/solo6x10-eeprom.c
@@ -0,0 +1,154 @@
+/*
+ * Copyright (C) 2010-2013 Bluecherry, LLC <http://www.bluecherrydvr.com>
+ *
+ * Original author:
+ * Ben Collins <bcollins@ubuntu.com>
+ *
+ * Additional work by:
+ * John Brooks <john.brooks@bluecherry.net>
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/delay.h>
+
+#include "solo6x10.h"
+
+/* Control */
+#define EE_SHIFT_CLK 0x04
+#define EE_CS 0x08
+#define EE_DATA_WRITE 0x02
+#define EE_DATA_READ 0x01
+#define EE_ENB (0x80 | EE_CS)
+
+#define eeprom_delay() udelay(100)
+#if 0
+#define eeprom_delay() solo_reg_read(solo_dev, SOLO_EEPROM_CTRL)
+#define eeprom_delay() ({ \
+ int i, ret; \
+ udelay(100); \
+ for (i = ret = 0; i < 1000 && !ret; i++) \
+ ret = solo_eeprom_reg_read(solo_dev); \
+})
+#endif
+#define ADDR_LEN 6
+
+/* Commands */
+#define EE_EWEN_CMD 4
+#define EE_EWDS_CMD 4
+#define EE_WRITE_CMD 5
+#define EE_READ_CMD 6
+#define EE_ERASE_CMD 7
+
+static unsigned int solo_eeprom_reg_read(struct solo_dev *solo_dev)
+{
+ return solo_reg_read(solo_dev, SOLO_EEPROM_CTRL) & EE_DATA_READ;
+}
+
+static void solo_eeprom_reg_write(struct solo_dev *solo_dev, u32 data)
+{
+ solo_reg_write(solo_dev, SOLO_EEPROM_CTRL, data);
+ eeprom_delay();
+}
+
+static void solo_eeprom_cmd(struct solo_dev *solo_dev, int cmd)
+{
+ int i;
+
+ solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ACCESS_EN);
+ solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE);
+
+ for (i = 4 + ADDR_LEN; i >= 0; i--) {
+ int dataval = (cmd & (1 << i)) ? EE_DATA_WRITE : 0;
+
+ solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE | dataval);
+ solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE |
+ EE_SHIFT_CLK | dataval);
+ }
+
+ solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE);
+}
+
+unsigned int solo_eeprom_ewen(struct solo_dev *solo_dev, int w_en)
+{
+ int ewen_cmd = (w_en ? 0x3f : 0) | (EE_EWEN_CMD << ADDR_LEN);
+ unsigned int retval = 0;
+ int i;
+
+ solo_eeprom_cmd(solo_dev, ewen_cmd);
+
+ for (i = 0; i < 16; i++) {
+ solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE |
+ EE_SHIFT_CLK);
+ retval = (retval << 1) | solo_eeprom_reg_read(solo_dev);
+ solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE);
+ retval = (retval << 1) | solo_eeprom_reg_read(solo_dev);
+ }
+
+ solo_eeprom_reg_write(solo_dev, ~EE_CS);
+ retval = (retval << 1) | solo_eeprom_reg_read(solo_dev);
+
+ return retval;
+}
+
+unsigned short solo_eeprom_read(struct solo_dev *solo_dev, int loc)
+{
+ int read_cmd = loc | (EE_READ_CMD << ADDR_LEN);
+ unsigned short retval = 0;
+ int i;
+
+ solo_eeprom_cmd(solo_dev, read_cmd);
+
+ for (i = 0; i < 16; i++) {
+ solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE |
+ EE_SHIFT_CLK);
+ retval = (retval << 1) | solo_eeprom_reg_read(solo_dev);
+ solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE);
+ }
+
+ solo_eeprom_reg_write(solo_dev, ~EE_CS);
+
+ return retval;
+}
+
+int solo_eeprom_write(struct solo_dev *solo_dev, int loc,
+ unsigned short data)
+{
+ int write_cmd = loc | (EE_WRITE_CMD << ADDR_LEN);
+ unsigned int retval;
+ int i;
+
+ solo_eeprom_cmd(solo_dev, write_cmd);
+
+ for (i = 15; i >= 0; i--) {
+ unsigned int dataval = (data >> i) & 1;
+
+ solo_eeprom_reg_write(solo_dev, EE_ENB);
+ solo_eeprom_reg_write(solo_dev,
+ EE_ENB | (dataval << 1) | EE_SHIFT_CLK);
+ }
+
+ solo_eeprom_reg_write(solo_dev, EE_ENB);
+ solo_eeprom_reg_write(solo_dev, ~EE_CS);
+ solo_eeprom_reg_write(solo_dev, EE_ENB);
+
+ for (i = retval = 0; i < 10000 && !retval; i++)
+ retval = solo_eeprom_reg_read(solo_dev);
+
+ solo_eeprom_reg_write(solo_dev, ~EE_CS);
+
+ return !retval;
+}