[PATCH] rtc: Add RTC class driver for the Maxim MAX6900
From: Dale Farnsworth <[EMAIL PROTECTED]>
Signed-off-by: Dale Farnsworth.org <[EMAIL PROTECTED]
---
drivers/rtc/Kconfig | 10 +
drivers/rtc/Makefile |1
drivers/rtc/rtc-max6900.c | 312
3 files changed, 323 insertions(+)
Index: linux-2.6-powerpc-df/drivers/rtc/Kconfig
===
--- linux-2.6-powerpc-df.orig/drivers/rtc/Kconfig
+++ linux-2.6-powerpc-df/drivers/rtc/Kconfig
@@ -334,6 +334,16 @@ config RTC_DRV_TEST
This driver can also be built as a module. If so, the module
will be called rtc-test.
+config RTC_DRV_MAX6900
+ tristate "Maxim 6900"
+ depends on RTC_CLASS && I2C
+ help
+ If you say yes here you will get support for the
+ Maxim MAX6900 I2C RTC chip.
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-max6900.
+
config RTC_DRV_MAX6902
tristate "Maxim 6902"
depends on RTC_CLASS && SPI
Index: linux-2.6-powerpc-df/drivers/rtc/Makefile
===
--- linux-2.6-powerpc-df.orig/drivers/rtc/Makefile
+++ linux-2.6-powerpc-df/drivers/rtc/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93
obj-$(CONFIG_RTC_DRV_SA1100) += rtc-sa1100.o
obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41xx.o
obj-$(CONFIG_RTC_DRV_PL031)+= rtc-pl031.o
+obj-$(CONFIG_RTC_DRV_MAX6900) += rtc-max6900.o
obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o
obj-$(CONFIG_RTC_DRV_V3020)+= rtc-v3020.o
obj-$(CONFIG_RTC_DRV_AT91RM9200)+= rtc-at91rm9200.o
Index: linux-2.6-powerpc-df/drivers/rtc/rtc-max6900.c
===
--- /dev/null
+++ linux-2.6-powerpc-df/drivers/rtc/rtc-max6900.c
@@ -0,0 +1,312 @@
+/*
+ * rtc class driver for the Maxim MAX6900 chip
+ *
+ * Author: Dale Farnsworth <[EMAIL PROTECTED]>
+ *
+ * based on previously existing rtc class drivers
+ *
+ * 2007 (c) MontaVista, Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#include
+#include
+#include
+#include
+#include
+
+#define DRV_NAME "max6900"
+#define DRV_VERSION "0.1"
+
+/*
+ * register indices
+ */
+#define MAX6900_REG_SC 0 /* seconds 00-59 */
+#define MAX6900_REG_MN 1 /* minutes 00-59 */
+#define MAX6900_REG_HR 2 /* hours00-23 */
+#define MAX6900_REG_DT 3 /* day of month 00-31 */
+#define MAX6900_REG_MO 4 /* month01-12 */
+#define MAX6900_REG_DW 5 /* day of week 1-7 */
+#define MAX6900_REG_YR 6 /* year 00-99 */
+#define MAX6900_REG_CT 7 /* control */
+#define MAX6900_REG_LEN8
+
+#define MAX6900_REG_CT_WP (1 << 7)/* Write Protect */
+
+/*
+ * register read/write commands
+ */
+#define MAX6900_REG_CONTROL_WRITE 0x8e
+#define MAX6900_REG_BURST_READ 0xbf
+#define MAX6900_REG_BURST_WRITE0xbe
+#define MAX6900_REG_RESERVED_READ 0x96
+
+#define MAX6900_IDLE_TIME_AFTER_WRITE 3 /* specification says 2.5 mS */
+
+#define MAX6900_I2C_ADDR 0xa0
+
+static unsigned short normal_i2c[] = {
+ MAX6900_I2C_ADDR >> 1,
+ I2C_CLIENT_END
+};
+
+I2C_CLIENT_INSMOD; /* defines addr_data */
+
+static int max6900_probe(struct i2c_adapter *adapter, int addr, int kind);
+
+static int max6900_i2c_read_regs(struct i2c_client *client, u8 *buf)
+{
+ u8 reg_addr[1] = { MAX6900_REG_BURST_READ };
+ struct i2c_msg msgs[2] = {
+ {
+ client->addr,
+ 0, /* write */
+ sizeof(reg_addr),
+ reg_addr
+ },
+ {
+ client->addr,
+ I2C_M_RD,
+ MAX6900_REG_LEN,
+ buf
+ }
+ };
+ int rc;
+
+ rc = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+ if (rc != ARRAY_SIZE(msgs)) {
+ dev_err(>dev, "%s: register read failed\n",
+ __FUNCTION__);
+ return -EIO;
+ }
+ return 0;
+}
+
+static int max6900_i2c_write_regs(struct i2c_client *client, u8 const *buf)
+{
+ u8 i2c_buf[MAX6900_REG_LEN + 1] = { MAX6900_REG_BURST_WRITE };
+ struct i2c_msg msgs[1] = {
+ {
+ client->addr,
+ 0, /* write */
+ MAX6900_REG_LEN + 1,
+ i2c_buf
+ }
+ };
+ int rc;
+
+ memcpy(_buf[1], buf, MAX6900_REG_LEN);
+
+
[PATCH] rtc: Add RTC class driver for the Maxim MAX6900
From: Dale Farnsworth [EMAIL PROTECTED]
Signed-off-by: Dale Farnsworth.org [EMAIL PROTECTED]
---
drivers/rtc/Kconfig | 10 +
drivers/rtc/Makefile |1
drivers/rtc/rtc-max6900.c | 312
3 files changed, 323 insertions(+)
Index: linux-2.6-powerpc-df/drivers/rtc/Kconfig
===
--- linux-2.6-powerpc-df.orig/drivers/rtc/Kconfig
+++ linux-2.6-powerpc-df/drivers/rtc/Kconfig
@@ -334,6 +334,16 @@ config RTC_DRV_TEST
This driver can also be built as a module. If so, the module
will be called rtc-test.
+config RTC_DRV_MAX6900
+ tristate Maxim 6900
+ depends on RTC_CLASS I2C
+ help
+ If you say yes here you will get support for the
+ Maxim MAX6900 I2C RTC chip.
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-max6900.
+
config RTC_DRV_MAX6902
tristate Maxim 6902
depends on RTC_CLASS SPI
Index: linux-2.6-powerpc-df/drivers/rtc/Makefile
===
--- linux-2.6-powerpc-df.orig/drivers/rtc/Makefile
+++ linux-2.6-powerpc-df/drivers/rtc/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93
obj-$(CONFIG_RTC_DRV_SA1100) += rtc-sa1100.o
obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41xx.o
obj-$(CONFIG_RTC_DRV_PL031)+= rtc-pl031.o
+obj-$(CONFIG_RTC_DRV_MAX6900) += rtc-max6900.o
obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o
obj-$(CONFIG_RTC_DRV_V3020)+= rtc-v3020.o
obj-$(CONFIG_RTC_DRV_AT91RM9200)+= rtc-at91rm9200.o
Index: linux-2.6-powerpc-df/drivers/rtc/rtc-max6900.c
===
--- /dev/null
+++ linux-2.6-powerpc-df/drivers/rtc/rtc-max6900.c
@@ -0,0 +1,312 @@
+/*
+ * rtc class driver for the Maxim MAX6900 chip
+ *
+ * Author: Dale Farnsworth [EMAIL PROTECTED]
+ *
+ * based on previously existing rtc class drivers
+ *
+ * 2007 (c) MontaVista, Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed as is without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#include linux/module.h
+#include linux/i2c.h
+#include linux/bcd.h
+#include linux/rtc.h
+#include linux/delay.h
+
+#define DRV_NAME max6900
+#define DRV_VERSION 0.1
+
+/*
+ * register indices
+ */
+#define MAX6900_REG_SC 0 /* seconds 00-59 */
+#define MAX6900_REG_MN 1 /* minutes 00-59 */
+#define MAX6900_REG_HR 2 /* hours00-23 */
+#define MAX6900_REG_DT 3 /* day of month 00-31 */
+#define MAX6900_REG_MO 4 /* month01-12 */
+#define MAX6900_REG_DW 5 /* day of week 1-7 */
+#define MAX6900_REG_YR 6 /* year 00-99 */
+#define MAX6900_REG_CT 7 /* control */
+#define MAX6900_REG_LEN8
+
+#define MAX6900_REG_CT_WP (1 7)/* Write Protect */
+
+/*
+ * register read/write commands
+ */
+#define MAX6900_REG_CONTROL_WRITE 0x8e
+#define MAX6900_REG_BURST_READ 0xbf
+#define MAX6900_REG_BURST_WRITE0xbe
+#define MAX6900_REG_RESERVED_READ 0x96
+
+#define MAX6900_IDLE_TIME_AFTER_WRITE 3 /* specification says 2.5 mS */
+
+#define MAX6900_I2C_ADDR 0xa0
+
+static unsigned short normal_i2c[] = {
+ MAX6900_I2C_ADDR 1,
+ I2C_CLIENT_END
+};
+
+I2C_CLIENT_INSMOD; /* defines addr_data */
+
+static int max6900_probe(struct i2c_adapter *adapter, int addr, int kind);
+
+static int max6900_i2c_read_regs(struct i2c_client *client, u8 *buf)
+{
+ u8 reg_addr[1] = { MAX6900_REG_BURST_READ };
+ struct i2c_msg msgs[2] = {
+ {
+ client-addr,
+ 0, /* write */
+ sizeof(reg_addr),
+ reg_addr
+ },
+ {
+ client-addr,
+ I2C_M_RD,
+ MAX6900_REG_LEN,
+ buf
+ }
+ };
+ int rc;
+
+ rc = i2c_transfer(client-adapter, msgs, ARRAY_SIZE(msgs));
+ if (rc != ARRAY_SIZE(msgs)) {
+ dev_err(client-dev, %s: register read failed\n,
+ __FUNCTION__);
+ return -EIO;
+ }
+ return 0;
+}
+
+static int max6900_i2c_write_regs(struct i2c_client *client, u8 const *buf)
+{
+ u8 i2c_buf[MAX6900_REG_LEN + 1] = { MAX6900_REG_BURST_WRITE };
+ struct i2c_msg msgs[1] = {
+ {
+ client-addr,
+ 0, /* write */
+ MAX6900_REG_LEN + 1,
+ i2c_buf
+ }
+ };
+ int rc;
+
+
