[U-Boot] [PATCH v2] hwmon: Add LM63 support

[Dirk Eibach]

This patch adds support for the National LM63 temperature
sensor with integrated fan control. It's used on the GDSys
Neo board (405EP) which will be submitted later.

Signed-off-by: Dirk Eibach <eibach at gdsys.de>
Acked-by: Stefan Roese <sr at denx.de>
---

 Sorry for the noise, Outlook messed up my first post.
 Hopefully git-send-email works better :)

 drivers/hwmon/Makefile |    1 +
 drivers/hwmon/lm63.c   |  174 ++++++++++++++++++++++++++++++++++++++++++++++++
 include/dtt.h          |    1 +
 3 files changed, 176 insertions(+), 0 deletions(-)
 create mode 100644 drivers/hwmon/lm63.c

diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 7f7d3db..59302fa 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -35,6 +35,7 @@ COBJS-$(CONFIG_DTT_ADT7460) += adt7460.o
 COBJS-$(CONFIG_DTT_DS1621) += ds1621.o
 COBJS-$(CONFIG_DTT_DS1722) += ds1722.o
 COBJS-$(CONFIG_DTT_DS1775) += ds1775.o
+COBJS-$(CONFIG_DTT_LM63) += lm63.o
 COBJS-$(CONFIG_DTT_LM73) += lm73.o
 COBJS-$(CONFIG_DTT_LM75) += lm75.o
 COBJS-$(CONFIG_DTT_LM81) += lm81.o
diff --git a/drivers/hwmon/lm63.c b/drivers/hwmon/lm63.c
new file mode 100644
index 0000000..03616e1
--- /dev/null
+++ b/drivers/hwmon/lm63.c
@@ -0,0 +1,174 @@
+/*
+ * (C) Copyright 2007-2008
+ * Dirk Eibach,  Guntermann & Drunck GmbH, eibach at gdsys.de
+ * based on lm75.c by Bill Hunter
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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
+ */
+
+/*
+ * National LM63 Temperature Sensor
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <dtt.h>
+
+#define DTT_I2C_DEV_CODE 0x4C	/* National LM63 device */
+
+#define DTT_READ_TEMP_RMT_MSB	0x01
+#define DTT_CONFIG		0x03
+#define DTT_READ_TEMP_RMT_LSB	0x10
+#define DTT_TACHLIM_LSB		0x48
+#define DTT_TACHLIM_MSB		0x49
+#define DTT_FAN_CONFIG		0x4A
+#define DTT_PWM_FREQ		0x4D
+#define DTT_PWM_LOOKUP_BASE	0x50
+
+struct pwm_lookup_entry {
+	u8 temp;
+	u8 pwm;
+};
+
+/*
+ * Device code
+ */
+
+int dtt_read(int sensor, int reg)
+{
+	int dlen;
+	uchar data[2];
+
+	/*
+	 * Calculate sensor address and register.
+	 */
+	sensor = DTT_I2C_DEV_CODE;	/* address of lm63 is not adjustable */
+
+	dlen = 1;
+
+	/*
+	 * Now try to read the register.
+	 */
+	if (i2c_read(sensor, reg, 1, data, dlen) != 0)
+		return -1;
+
+	return (int)data[0];
+}				/* dtt_read() */
+
+int dtt_write(int sensor, int reg, int val)
+{
+	int dlen;
+	uchar data[2];
+
+	/*
+	 * Calculate sensor address and register.
+	 */
+	sensor = DTT_I2C_DEV_CODE;	/* address of lm63 is not adjustable */
+
+	dlen = 1;
+	data[0] = (char)(val & 0xff);
+
+	/*
+	 * Write value to register.
+	 */
+	if (i2c_write(sensor, reg, 1, data, dlen) != 0)
+		return 1;
+
+	return 0;
+}				/* dtt_write() */
+
+static int _dtt_init(int sensor)
+{
+	int i;
+	int val;
+
+	struct pwm_lookup_entry pwm_lookup[] = CONFIG_DTT_PWM_LOOKUPTABLE;
+
+	/*
+	 * Set PWM Frequency to 2.5% resolution
+	 */
+	val = 20;
+	if (dtt_write(sensor, DTT_PWM_FREQ, val) != 0)
+		return 1;
+
+	/*
+	 * Set Tachometer Limit
+	 */
+	val = CONFIG_DTT_TACH_LIMIT;
+	if (dtt_write(sensor, DTT_TACHLIM_LSB, val & 0xff) != 0)
+		return 1;
+	if (dtt_write(sensor, DTT_TACHLIM_MSB, (val >> 8) & 0xff) != 0)
+		return 1;
+
+	/*
+	 * Setup PWM Lookup-Table
+	 */
+	for (i = 0; i < sizeof(pwm_lookup) / sizeof(struct pwm_lookup_entry);
+	     i++) {
+		int address = DTT_PWM_LOOKUP_BASE + 2 * i;
+		val = pwm_lookup[i].temp;
+		if (dtt_write(sensor, address, val) != 0)
+			return 1;
+		val = pwm_lookup[i].pwm;
+		if (dtt_write(sensor, address + 1, val) != 0)
+			return 1;
+	}
+
+	/*
+	 * Enable PWM Lookup-Table, PWM Clock 360 kHz, Tachometer Mode 2
+	 */
+	val = 0x02;
+	if (dtt_write(sensor, DTT_FAN_CONFIG, val) != 0)
+		return 1;
+
+	/*
+	 * Enable Tach input
+	 */
+	val = dtt_read(sensor, DTT_CONFIG) | 0x04;
+	if (dtt_write(sensor, DTT_CONFIG, val) != 0)
+		return 1;
+
+	return 0;
+}
+
+int dtt_get_temp(int sensor)
+{
+	s16 temp = (dtt_read(sensor, DTT_READ_TEMP_RMT_MSB) << 8)
+	    | (dtt_read(sensor, DTT_READ_TEMP_RMT_LSB));
+
+	/* Ignore LSB for now, U-Boot only prints natural numbers */
+	return temp >> 8;
+}
+
+int dtt_init(void)
+{
+	int i;
+	unsigned char sensors[] = CONFIG_DTT_SENSORS;
+	const char *const header = "DTT:   ";
+
+	for (i = 0; i < sizeof(sensors); i++) {
+		if (_dtt_init(sensors[i]) != 0)
+			printf("%s%d FAILED INIT\n", header, i + 1);
+		else
+			printf("%s%d is %i C\n", header, i + 1,
+			       dtt_get_temp(sensors[i]));
+	}
+
+	return 0;
+}
diff --git a/include/dtt.h b/include/dtt.h
index 0c8ee76..965e82e 100644
--- a/include/dtt.h
+++ b/include/dtt.h
@@ -31,6 +31,7 @@
     defined(CONFIG_DTT_ADT7460)	|| \
     defined(CONFIG_DTT_DS1621)	|| \
     defined(CONFIG_DTT_DS1775)	|| \
+    defined(CONFIG_DTT_LM63)	|| \
     defined(CONFIG_DTT_LM73)	|| \
     defined(CONFIG_DTT_LM75)	|| \
     defined(CONFIG_DTT_LM81)
-- 
1.5.6.5