linux-imx
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committed 0f875acc93d55
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};56
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struct lm73_data {58
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struct i2c_client *client;59
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struct mutex lock;60
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u8 ctrl; /* control register value */61
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};62
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/*-----------------------------------------------------------------------*/64
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static ssize_t set_temp(struct device *dev, struct device_attribute *da,66
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const char *buf, size_t count)65
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static ssize_t temp_store(struct device *dev, struct device_attribute *da,66
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const char *buf, size_t count)67
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{68
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);69
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struct lm73_data *data = dev_get_drvdata(dev);70
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long temp;71
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short value;72
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s32 err;73
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int status = kstrtol(buf, 10, &temp);75
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if (status < 0)76
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return status;77
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/* Write value */79
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value = clamp_val(temp / 250, LM73_TEMP_MIN, LM73_TEMP_MAX) << 5;80
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err = i2c_smbus_write_word_swapped(data->client, attr->index, value);81
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return (err < 0) ? err : count;82
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}83
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static ssize_t show_temp(struct device *dev, struct device_attribute *da,84
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static ssize_t temp_show(struct device *dev, struct device_attribute *da,85
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char *buf)86
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{87
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);88
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struct lm73_data *data = dev_get_drvdata(dev);89
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int temp;90
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s32 err = i2c_smbus_read_word_swapped(data->client, attr->index);92
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if (err < 0)93
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return err;94
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/* use integer division instead of equivalent right shift to96
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guarantee arithmetic shift and preserve the sign */97
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temp = (((s16) err) * 250) / 32;98
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return scnprintf(buf, PAGE_SIZE, "%d\n", temp);99
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}100
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static ssize_t set_convrate(struct device *dev, struct device_attribute *da,102
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const char *buf, size_t count)101
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static ssize_t convrate_store(struct device *dev, struct device_attribute *da,102
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const char *buf, size_t count)103
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{104
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struct lm73_data *data = dev_get_drvdata(dev);105
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unsigned long convrate;106
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s32 err;107
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int res = 0;108
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err = kstrtoul(buf, 10, &convrate);110
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if (err < 0)111
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return err;112
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err = i2c_smbus_write_byte_data(data->client, LM73_REG_CTRL,127
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data->ctrl);128
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mutex_unlock(&data->lock);129
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if (err < 0)131
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return err;132
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return count;134
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}135
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static ssize_t show_convrate(struct device *dev, struct device_attribute *da,136
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static ssize_t convrate_show(struct device *dev, struct device_attribute *da,137
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char *buf)138
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{139
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struct lm73_data *data = dev_get_drvdata(dev);140
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int res;141
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res = (data->ctrl & LM73_CTRL_RES_MASK) >> LM73_CTRL_RES_SHIFT;143
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return scnprintf(buf, PAGE_SIZE, "%hu\n", lm73_convrates[res]);144
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}145
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static ssize_t show_maxmin_alarm(struct device *dev,146
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static ssize_t maxmin_alarm_show(struct device *dev,147
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struct device_attribute *da, char *buf)148
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{149
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);150
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struct lm73_data *data = dev_get_drvdata(dev);151
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s32 ctrl;152
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mutex_lock(&data->lock);154
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ctrl = i2c_smbus_read_byte_data(data->client, LM73_REG_CTRL);155
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if (ctrl < 0)156
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goto abort;161
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abort:163
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mutex_unlock(&data->lock);164
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return ctrl;165
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}166
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/*-----------------------------------------------------------------------*/168
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/* sysfs attributes for hwmon */170
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static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,172
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show_temp, set_temp, LM73_REG_MAX);173
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static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO,174
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show_temp, set_temp, LM73_REG_MIN);175
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,176
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show_temp, NULL, LM73_REG_INPUT);177
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static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO,178
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show_convrate, set_convrate, 0);179
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static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,180
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show_maxmin_alarm, NULL, LM73_CTRL_HI_SHIFT);181
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static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,182
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show_maxmin_alarm, NULL, LM73_CTRL_LO_SHIFT);171
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static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, LM73_REG_MAX);172
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static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, LM73_REG_MIN);173
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static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, LM73_REG_INPUT);174
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static SENSOR_DEVICE_ATTR_RW(update_interval, convrate, 0);175
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static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, maxmin_alarm,176
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LM73_CTRL_HI_SHIFT);177
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static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, maxmin_alarm,178
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LM73_CTRL_LO_SHIFT);183
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static struct attribute *lm73_attrs[] = {185
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&sensor_dev_attr_temp1_input.dev_attr.attr,186
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&sensor_dev_attr_temp1_max.dev_attr.attr,187
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&sensor_dev_attr_temp1_min.dev_attr.attr,188
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&sensor_dev_attr_update_interval.dev_attr.attr,189
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&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,190
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&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,191
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NULL192
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};