On Wed, Jul 17, 2013 at 01:53:07PM -0700, Andy Lutomirski wrote:
> Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
> ---
Why don't you just use the existing jc42 driver ?
Guenter
> drivers/hwmon/Kconfig | 10 +++
> drivers/hwmon/Makefile | 1 +
> drivers/hwmon/tsod.c | 195 +++++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 206 insertions(+)
> create mode 100644 drivers/hwmon/tsod.c
>
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 89ac1cb..96edb87 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -1462,6 +1462,16 @@ config SENSORS_MC13783_ADC
> help
> Support for the A/D converter on MC13783 and MC13892 PMIC.
>
> +config SENSORS_TSOD
> + tristate "Temperature Sensor On DIMM (TSOD)"
> + depends on I2C
> + help
> + If you say yes here you get support for the integrated temperature
> + sensors on newer DIMMs that comply with JESD21-C.
> +
> + This driver can also be built as a module. If so, the module
> + will be called tsod.
> +
> if ACPI
>
> comment "ACPI drivers"
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index 8d6d97e..439ef1f 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -134,6 +134,7 @@ obj-$(CONFIG_SENSORS_W83L785TS) += w83l785ts.o
> obj-$(CONFIG_SENSORS_W83L786NG) += w83l786ng.o
> obj-$(CONFIG_SENSORS_WM831X) += wm831x-hwmon.o
> obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o
> +obj-$(CONFIG_SENSORS_TSOD) += tsod.o
>
> obj-$(CONFIG_PMBUS) += pmbus/
>
> diff --git a/drivers/hwmon/tsod.c b/drivers/hwmon/tsod.c
> new file mode 100644
> index 0000000..f7bb070
> --- /dev/null
> +++ b/drivers/hwmon/tsod.c
> @@ -0,0 +1,195 @@
> +/*
> + * drivers/hwmon/tsod.c - Temperaure Sensor On DIMM
> + *
> + * Copyright (C) 2013 Andrew Lutomirski <luto@xxxxxxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License v2 as published by the
> + * Free Software Foundation.
> + *
> + * 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.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
> + *
> + * The official reference for these devices is JEDEC Standard No. 21-C,
> + * which is available for free from www.jedec.org.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/err.h>
> +#include <linux/i2c.h>
> +#include <linux/hwmon.h>
> +#include <linux/hwmon-sysfs.h>
> +#include <linux/slab.h>
> +
> +/* Registers */
> +#define TSOD_CURRENT_TEMP 5
> +#define TSOD_VENDOR 6
> +#define TSOD_DEVICE 7
> +
> +/*
> + * This driver does not program the trip points, etc. -- this is done by
> + * firmware, and the memory controller probably wants the defaults preserved.
> + */
> +
> +struct tsod_priv {
> + struct i2c_client *client;
> + struct device *hwmondev;
> +};
> +
> +static ssize_t show_name(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + return sprintf(buf, "TSOD\n");
> +}
> +
> +static ssize_t show_label(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + return sprintf(buf, "DIMM Temperature\n");
> +}
> +
> +static ssize_t show_temperature(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct tsod_priv *priv = dev_get_drvdata(dev->parent);
> + int temp, raw;
> +
> + raw = i2c_smbus_read_word_swapped(priv->client, TSOD_CURRENT_TEMP);
> + if (raw < 0)
> + return raw;
> +
> + /*
> + * The three high bits are undefined and the rest is twos-complement.
> + * Use a sign-extending right shift to propagate the sign bit.
> + */
> + temp = ((s16)((s16)raw << 3) >> 3);
> +
> + /*
> + * The value is in units of 0.0625 degrees, but we want it in
> + * units of 0.001 degrees.
> + */
> + return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(temp * 625, 10));
> +}
> +
> +static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
> +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temperature, NULL, 0);
> +static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL, 0);
> +
> +static struct attribute *tsod_hwmon_attributes[] = {
> + &dev_attr_name.attr,
> + &sensor_dev_attr_temp1_input.dev_attr.attr,
> + &sensor_dev_attr_temp1_label.dev_attr.attr,
> +
> + NULL,
> +};
> +
> +static const struct attribute_group tsod_hwmon_attr_group = {
> + .attrs = tsod_hwmon_attributes,
> +};
> +
> +static int tsod_detect(struct i2c_client *client, struct i2c_board_info *info)
> +{
> + struct i2c_adapter *adapter = client->adapter;
> +
> + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_WORD_DATA))
> + return -ENODEV;
> +
> + strlcpy(info->type, "tsod", I2C_NAME_SIZE);
> + return 0;
> +}
> +
> +static int tsod_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + int ret;
> + struct tsod_priv *priv;
> +
> + /* Sanity check the address */
> + if ((client->addr & 0x78) != 0x18)
> + return -ENODEV;
> +
> + /* Sanity check: make sure we can read the temperature. */
> + ret = i2c_smbus_read_word_swapped(client, TSOD_CURRENT_TEMP);
> + if (ret < 0)
> + return -ENODEV;
> +
> + priv = kzalloc(sizeof(struct tsod_priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + priv->client = client;
> +
> + priv->hwmondev = hwmon_device_register(&client->dev);
> + if (IS_ERR(priv->hwmondev)) {
> + ret = PTR_ERR(priv->hwmondev);
> + goto err_free;
> + }
> +
> + i2c_set_clientdata(client, priv);
> +
> + ret = sysfs_create_group(&priv->hwmondev->kobj, &tsod_hwmon_attr_group);
> + if (ret)
> + goto err_unreg;
> +
> + return 0;
> +
> +err_unreg:
> + hwmon_device_unregister(&client->dev);
> +
> +err_free:
> + kfree(priv);
> + i2c_set_clientdata(client, 0);
> + return ret;
> +}
> +
> +static int tsod_remove(struct i2c_client *client)
> +{
> + struct tsod_priv *priv = i2c_get_clientdata(client);
> +
> + sysfs_remove_group(&priv->hwmondev->kobj, &tsod_hwmon_attr_group);
> + hwmon_device_unregister(priv->hwmondev);
> + kfree(priv);
> + return 0;
> +}
> +
> +static const unsigned short tsod_addresses[] = {
> + 0x18, 0x19, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, I2C_CLIENT_END
> +};
> +
> +static const struct i2c_device_id tsod_id[] = {
> + { "tsod", 0 },
> + { }
> +};
> +MODULE_DEVICE_TABLE(i2c, tsod_id);
> +
> +static struct i2c_driver tsod_driver = {
> + .driver = {
> + .name = "tsod",
> + .owner = THIS_MODULE,
> + },
> + .probe = tsod_probe,
> + .remove = tsod_remove,
> + .id_table = tsod_id,
> +
> + /*
> + * We do not claim I2C_CLASS_SPD -- there are other devices
> + * on, e.g., the i2c_i801 bus that have these addresses.
> + * Instead we let the dimm-bus code instantiate us.
> + */
> +
> + .detect = tsod_detect,
> + .address_list = tsod_addresses,
> +};
> +
> +module_i2c_driver(tsod_driver);
> +
> +MODULE_AUTHOR("Andrew Lutomirski <luto@xxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Temperaure Sensor On DIMM");
> +MODULE_LICENSE("GPL");
> --
> 1.8.1.4
>
>
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