This is a note to let you know that I've just added the patch titled
Subject: [PATCH 13/14] lm70: New hardware monitoring driver
to my gregkh-2.6 tree. Its filename is
hwmon-lm70-new-driver.patch
This tree can be found at
http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/patches/
>From khali at linux-fr.org Mon Jun 12 13:00:12 2006
Date: Mon, 12 Jun 2006 22:00:05 +0200
From: Kaiwan N Billimoria <kaiwan at designergraphix.com>
To: Greg KH <greg at kroah.com>
Cc: LM Sensors <lm-sensors at lm-sensors.org>, Kaiwan N Billimoria <kaiwan at designergraphix.com>
Subject: [PATCH 13/14] lm70: New hardware monitoring driver
Message-Id: <20060612220005.cd9ce8ad.khali at linux-fr.org>
Content-Disposition: inline; filename=hwmon-lm70-new-driver.patch
From: Kaiwan N Billimoria <kaiwan at designergraphix.com>
This driver implements support for the National Semiconductor LM70
temperature sensor.
The LM70 temperature sensor chip supports a single temperature sensor.
It communicates with a host processor (or microcontroller) via an
SPI/Microwire Bus interface.
Communication with the LM70 is simple: when the temperature is to be sensed,
the driver accesses the LM70 using SPI communication: 16 SCLK cycles
comprise the MOSI/MISO loop. At the end of the transfer, the 11-bit 2's
complement digital temperature (sent via the SIO line), is available in the
driver for interpretation. This driver makes use of the kernel's in-core
SPI support.
Signed-off-by: Kaiwan N Billimoria <kaiwan at designergraphix.com>
Signed-off-by: Jean Delvare <khali at linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh at suse.de>
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.17-rc6/Documentation/hwmon/lm70 2006-06-12 21:58:17.000000000 +0200
@@ -0,0 +1,31 @@
+Kernel driver lm70
+==================
+
+Supported chip:
+ * National Semiconductor LM70
+ Datasheet: http://www.national.com/pf/LM/LM70.html
+
+Author:
+ Kaiwan N Billimoria <kaiwan at designergraphix.com>
+
+Description
+-----------
+
+This driver implements support for the National Semiconductor LM70
+temperature sensor.
+
+The LM70 temperature sensor chip supports a single temperature sensor.
+It communicates with a host processor (or microcontroller) via an
+SPI/Microwire Bus interface.
+
+Communication with the LM70 is simple: when the temperature is to be sensed,
+the driver accesses the LM70 using SPI communication: 16 SCLK cycles
+comprise the MOSI/MISO loop. At the end of the transfer, the 11-bit 2's
+complement digital temperature (sent via the SIO line), is available in the
+driver for interpretation. This driver makes use of the kernel's in-core
+SPI support.
+
+Thanks to
+---------
+Jean Delvare <khali at linux-fr.org> for mentoring the hwmon-side driver
+development.
--- linux-2.6.17-rc6.orig/drivers/hwmon/Kconfig 2006-06-12 19:16:40.000000000 +0200
+++ linux-2.6.17-rc6/drivers/hwmon/Kconfig 2006-06-12 19:17:08.000000000 +0200
@@ -204,6 +204,16 @@
This driver can also be built as a module. If so, the module
will be called lm63.
+config SENSORS_LM70
+ tristate "National Semiconductor LM70"
+ depends on HWMON && SPI_MASTER && EXPERIMENTAL
+ help
+ If you say yes here you get support for the National Semiconductor
+ LM70 digital temperature sensor chip.
+
+ This driver can also be built as a module. If so, the module
+ will be called lm70.
+
config SENSORS_LM75
tristate "National Semiconductor LM75 and compatibles"
depends on HWMON && I2C
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.17-rc6/drivers/hwmon/lm70.c 2006-06-12 19:17:08.000000000 +0200
@@ -0,0 +1,165 @@
+/*
+ * lm70.c
+ *
+ * The LM70 is a temperature sensor chip from National Semiconductor (NS).
+ * Copyright (C) 2006 Kaiwan N Billimoria <kaiwan at designergraphix.com>
+ *
+ * The LM70 communicates with a host processor via an SPI/Microwire Bus
+ * interface. The complete datasheet is available at National's website
+ * here:
+ * http://www.national.com/pf/LM/LM70.html
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/sysfs.h>
+#include <linux/hwmon.h>
+#include <linux/spi/spi.h>
+#include <asm/semaphore.h>
+
+#define DRVNAME "lm70"
+
+struct lm70 {
+ struct class_device *cdev;
+ struct semaphore sem;
+};
+
+/* sysfs hook function */
+static ssize_t lm70_sense_temp(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ int status, val;
+ u8 rxbuf[2];
+ s16 raw=0;
+ struct lm70 *p_lm70 = dev_get_drvdata(&spi->dev);
+
+ if (down_interruptible(&p_lm70->sem))
+ return -ERESTARTSYS;
+
+ /*
+ * spi_read() requires a DMA-safe buffer; so we use
+ * spi_write_then_read(), transmitting 0 bytes.
+ */
+ status = spi_write_then_read(spi, NULL, 0, &rxbuf[0], 2);
+ if (status < 0) {
+ printk(KERN_WARNING
+ "spi_write_then_read failed with status %d\n", status);
+ goto out;
+ }
+ dev_dbg(dev, "rxbuf[1] : 0x%x rxbuf[0] : 0x%x\n", rxbuf[1], rxbuf[0]);
+
+ raw = (rxbuf[1] << 8) + rxbuf[0];
+ dev_dbg(dev, "raw=0x%x\n", raw);
+
+ /*
+ * The "raw" temperature read into rxbuf[] is a 16-bit signed 2's
+ * complement value. Only the MSB 11 bits (1 sign + 10 temperature
+ * bits) are meaningful; the LSB 5 bits are to be discarded.
+ * See the datasheet.
+ *
+ * Further, each bit represents 0.25 degrees Celsius; so, multiply
+ * by 0.25. Also multiply by 1000 to represent in millidegrees
+ * Celsius.
+ * So it's equivalent to multiplying by 0.25 * 1000 = 250.
+ */
+ val = ((int)raw/32) * 250;
+ status = sprintf(buf, "%+d\n", val); /* millidegrees Celsius */
+out:
+ up(&p_lm70->sem);
+ return status;
+}
+
+static DEVICE_ATTR(temp1_input, S_IRUGO, lm70_sense_temp, NULL);
+
+/*----------------------------------------------------------------------*/
+
+static int __devinit lm70_probe(struct spi_device *spi)
+{
+ struct lm70 *p_lm70;
+ int status;
+
+ p_lm70 = kzalloc(sizeof *p_lm70, GFP_KERNEL);
+ if (!p_lm70)
+ return -ENOMEM;
+
+ init_MUTEX(&p_lm70->sem);
+
+ /* sysfs hook */
+ p_lm70->cdev = hwmon_device_register(&spi->dev);
+ if (IS_ERR(p_lm70->cdev)) {
+ dev_dbg(&spi->dev, "hwmon_device_register failed.\n");
+ status = PTR_ERR(p_lm70->cdev);
+ goto out_dev_reg_failed;
+ }
+ dev_set_drvdata(&spi->dev, p_lm70);
+
+ if ((status = device_create_file(&spi->dev, &dev_attr_temp1_input))) {
+ dev_dbg(&spi->dev, "device_create_file failure.\n");
+ goto out_dev_create_file_failed;
+ }
+
+ return 0;
+
+out_dev_create_file_failed:
+ hwmon_device_unregister(p_lm70->cdev);
+out_dev_reg_failed:
+ dev_set_drvdata(&spi->dev, NULL);
+ kfree(p_lm70);
+ return status;
+}
+
+static int __exit lm70_remove(struct spi_device *spi)
+{
+ struct lm70 *p_lm70 = dev_get_drvdata(&spi->dev);
+
+ device_remove_file(&spi->dev, &dev_attr_temp1_input);
+ hwmon_device_unregister(p_lm70->cdev);
+ dev_set_drvdata(&spi->dev, NULL);
+ kfree(p_lm70);
+
+ return 0;
+}
+
+static struct spi_driver lm70_driver = {
+ .driver = {
+ .name = "lm70",
+ .owner = THIS_MODULE,
+ },
+ .probe = lm70_probe,
+ .remove = __devexit_p(lm70_remove),
+};
+
+static int __init init_lm70(void)
+{
+ return spi_register_driver(&lm70_driver);
+}
+
+static void __exit cleanup_lm70(void)
+{
+ spi_unregister_driver(&lm70_driver);
+}
+
+module_init(init_lm70);
+module_exit(cleanup_lm70);
+
+MODULE_AUTHOR("Kaiwan N Billimoria");
+MODULE_DESCRIPTION("National Semiconductor LM70 Linux driver");
+MODULE_LICENSE("GPL");
--- linux-2.6.17-rc6.orig/drivers/hwmon/Makefile 2006-06-12 18:41:00.000000000 +0200
+++ linux-2.6.17-rc6/drivers/hwmon/Makefile 2006-06-12 19:17:08.000000000 +0200
@@ -28,6 +28,7 @@
obj-$(CONFIG_SENSORS_HDAPS) += hdaps.o
obj-$(CONFIG_SENSORS_IT87) += it87.o
obj-$(CONFIG_SENSORS_LM63) += lm63.o
+obj-$(CONFIG_SENSORS_LM70) += lm70.o
obj-$(CONFIG_SENSORS_LM75) += lm75.o
obj-$(CONFIG_SENSORS_LM77) += lm77.o
obj-$(CONFIG_SENSORS_LM78) += lm78.o
--
Jean Delvare
Patches currently in gregkh-2.6 which might be from kaiwan at designergraphix.com are
i2c/hwmon-kconfig-header-fix.patch
i2c/hwmon-lm70-new-driver.patch
