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3710263f13
Also introduce new variable dev pointing to client->dev in the probe function, and use new macro ATTRIBUTE_GROUPS to declare attribute groups. Signed-off-by: Guenter Roeck <linux@roeck-us.net>
288 lines
7.6 KiB
C
288 lines
7.6 KiB
C
/*
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* LM73 Sensor driver
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* Based on LM75
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*
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* Copyright (C) 2007, CenoSYS (www.cenosys.com).
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* Copyright (C) 2009, Bollore telecom (www.bolloretelecom.eu).
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*
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* Guillaume Ligneul <guillaume.ligneul@gmail.com>
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* Adrien Demarez <adrien.demarez@bolloretelecom.eu>
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* Jeremy Laine <jeremy.laine@bolloretelecom.eu>
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* Chris Verges <kg4ysn@gmail.com>
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*
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* This software program is licensed subject to the GNU General Public License
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* (GPL).Version 2,June 1991, available at
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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/* Addresses scanned */
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static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c,
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0x4d, 0x4e, I2C_CLIENT_END };
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/* LM73 registers */
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#define LM73_REG_INPUT 0x00
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#define LM73_REG_CONF 0x01
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#define LM73_REG_MAX 0x02
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#define LM73_REG_MIN 0x03
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#define LM73_REG_CTRL 0x04
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#define LM73_REG_ID 0x07
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#define LM73_ID 0x9001 /* 0x0190, byte-swapped */
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#define DRVNAME "lm73"
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#define LM73_TEMP_MIN (-256000 / 250)
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#define LM73_TEMP_MAX (255750 / 250)
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#define LM73_CTRL_RES_SHIFT 5
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#define LM73_CTRL_RES_MASK (BIT(5) | BIT(6))
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#define LM73_CTRL_TO_MASK BIT(7)
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#define LM73_CTRL_HI_SHIFT 2
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#define LM73_CTRL_LO_SHIFT 1
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static const unsigned short lm73_convrates[] = {
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14, /* 11-bits (0.25000 C/LSB): RES1 Bit = 0, RES0 Bit = 0 */
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28, /* 12-bits (0.12500 C/LSB): RES1 Bit = 0, RES0 Bit = 1 */
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56, /* 13-bits (0.06250 C/LSB): RES1 Bit = 1, RES0 Bit = 0 */
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112, /* 14-bits (0.03125 C/LSB): RES1 Bit = 1, RES0 Bit = 1 */
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};
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struct lm73_data {
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struct i2c_client *client;
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struct mutex lock;
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u8 ctrl; /* control register value */
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};
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/*-----------------------------------------------------------------------*/
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static ssize_t set_temp(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct lm73_data *data = dev_get_drvdata(dev);
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long temp;
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short value;
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s32 err;
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int status = kstrtol(buf, 10, &temp);
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if (status < 0)
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return status;
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/* Write value */
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value = clamp_val(temp / 250, LM73_TEMP_MIN, LM73_TEMP_MAX) << 5;
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err = i2c_smbus_write_word_swapped(data->client, attr->index, value);
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return (err < 0) ? err : count;
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}
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static ssize_t show_temp(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct lm73_data *data = dev_get_drvdata(dev);
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int temp;
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s32 err = i2c_smbus_read_word_swapped(data->client, attr->index);
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if (err < 0)
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return err;
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/* use integer division instead of equivalent right shift to
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guarantee arithmetic shift and preserve the sign */
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temp = (((s16) err) * 250) / 32;
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return scnprintf(buf, PAGE_SIZE, "%d\n", temp);
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}
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static ssize_t set_convrate(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count)
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{
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struct lm73_data *data = dev_get_drvdata(dev);
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unsigned long convrate;
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s32 err;
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int res = 0;
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err = kstrtoul(buf, 10, &convrate);
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if (err < 0)
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return err;
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/*
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* Convert the desired conversion rate into register bits.
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* res is already initialized, and everything past the second-to-last
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* value in the array is treated as belonging to the last value
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* in the array.
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*/
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while (res < (ARRAY_SIZE(lm73_convrates) - 1) &&
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convrate > lm73_convrates[res])
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res++;
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mutex_lock(&data->lock);
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data->ctrl &= LM73_CTRL_TO_MASK;
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data->ctrl |= res << LM73_CTRL_RES_SHIFT;
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err = i2c_smbus_write_byte_data(data->client, LM73_REG_CTRL,
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data->ctrl);
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mutex_unlock(&data->lock);
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if (err < 0)
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return err;
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return count;
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}
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static ssize_t show_convrate(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct lm73_data *data = dev_get_drvdata(dev);
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int res;
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res = (data->ctrl & LM73_CTRL_RES_MASK) >> LM73_CTRL_RES_SHIFT;
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return scnprintf(buf, PAGE_SIZE, "%hu\n", lm73_convrates[res]);
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}
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static ssize_t show_maxmin_alarm(struct device *dev,
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struct device_attribute *da, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct lm73_data *data = dev_get_drvdata(dev);
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s32 ctrl;
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mutex_lock(&data->lock);
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ctrl = i2c_smbus_read_byte_data(data->client, LM73_REG_CTRL);
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if (ctrl < 0)
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goto abort;
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data->ctrl = ctrl;
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mutex_unlock(&data->lock);
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return scnprintf(buf, PAGE_SIZE, "%d\n", (ctrl >> attr->index) & 1);
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abort:
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mutex_unlock(&data->lock);
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return ctrl;
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}
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/*-----------------------------------------------------------------------*/
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/* sysfs attributes for hwmon */
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static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
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show_temp, set_temp, LM73_REG_MAX);
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static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO,
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show_temp, set_temp, LM73_REG_MIN);
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
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show_temp, NULL, LM73_REG_INPUT);
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static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO,
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show_convrate, set_convrate, 0);
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static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
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show_maxmin_alarm, NULL, LM73_CTRL_HI_SHIFT);
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static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
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show_maxmin_alarm, NULL, LM73_CTRL_LO_SHIFT);
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static struct attribute *lm73_attrs[] = {
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp1_min.dev_attr.attr,
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&sensor_dev_attr_update_interval.dev_attr.attr,
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&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(lm73);
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/*-----------------------------------------------------------------------*/
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/* device probe and removal */
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static int
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lm73_probe(struct i2c_client *client, const struct i2c_device_id *id)
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{
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struct device *dev = &client->dev;
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struct device *hwmon_dev;
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struct lm73_data *data;
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int ctrl;
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data = devm_kzalloc(dev, sizeof(struct lm73_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->client = client;
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mutex_init(&data->lock);
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ctrl = i2c_smbus_read_byte_data(client, LM73_REG_CTRL);
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if (ctrl < 0)
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return ctrl;
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data->ctrl = ctrl;
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hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
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data, lm73_groups);
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if (IS_ERR(hwmon_dev))
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return PTR_ERR(hwmon_dev);
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dev_info(dev, "sensor '%s'\n", client->name);
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return 0;
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}
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static const struct i2c_device_id lm73_ids[] = {
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{ "lm73", 0 },
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{ /* LIST END */ }
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};
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MODULE_DEVICE_TABLE(i2c, lm73_ids);
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/* Return 0 if detection is successful, -ENODEV otherwise */
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static int lm73_detect(struct i2c_client *new_client,
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struct i2c_board_info *info)
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{
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struct i2c_adapter *adapter = new_client->adapter;
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int id, ctrl, conf;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
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I2C_FUNC_SMBUS_WORD_DATA))
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return -ENODEV;
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/*
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* Do as much detection as possible with byte reads first, as word
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* reads can confuse other devices.
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*/
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ctrl = i2c_smbus_read_byte_data(new_client, LM73_REG_CTRL);
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if (ctrl < 0 || (ctrl & 0x10))
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return -ENODEV;
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conf = i2c_smbus_read_byte_data(new_client, LM73_REG_CONF);
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if (conf < 0 || (conf & 0x0c))
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return -ENODEV;
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id = i2c_smbus_read_byte_data(new_client, LM73_REG_ID);
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if (id < 0 || id != (LM73_ID & 0xff))
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return -ENODEV;
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/* Check device ID */
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id = i2c_smbus_read_word_data(new_client, LM73_REG_ID);
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if (id < 0 || id != LM73_ID)
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return -ENODEV;
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strlcpy(info->type, "lm73", I2C_NAME_SIZE);
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return 0;
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}
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static struct i2c_driver lm73_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "lm73",
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},
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.probe = lm73_probe,
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.id_table = lm73_ids,
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.detect = lm73_detect,
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.address_list = normal_i2c,
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};
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module_i2c_driver(lm73_driver);
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MODULE_AUTHOR("Guillaume Ligneul <guillaume.ligneul@gmail.com>");
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MODULE_DESCRIPTION("LM73 driver");
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MODULE_LICENSE("GPL");
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