linux-imx
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committed d7f2a8f596bx
/* Calculate voltage in microVolts (151 uV per increment) */ const unsigned int voltage = data->regs[LTC4215_SENSE] * 151; /* Calculate current in milliAmperes (4 milliOhm sense resistor) */ const unsigned int curr = voltage / 4; return curr;}static ssize_t ltc4215_show_voltage(struct device *dev, struct device_attribute *da, char *buf)static ssize_t ltc4215_voltage_show(struct device *dev, struct device_attribute *da, char *buf){ struct sensor_device_attribute *attr = to_sensor_dev_attr(da); const int voltage = ltc4215_get_voltage(dev, attr->index); return snprintf(buf, PAGE_SIZE, "%d\n", voltage);}static ssize_t ltc4215_show_current(struct device *dev, struct device_attribute *da, char *buf)static ssize_t ltc4215_current_show(struct device *dev, struct device_attribute *da, char *buf){ const unsigned int curr = ltc4215_get_current(dev); return snprintf(buf, PAGE_SIZE, "%u\n", curr);}static ssize_t ltc4215_show_power(struct device *dev, struct device_attribute *da, char *buf)static ssize_t ltc4215_power_show(struct device *dev, struct device_attribute *da, char *buf){ const unsigned int curr = ltc4215_get_current(dev); const int output_voltage = ltc4215_get_voltage(dev, LTC4215_ADIN); /* current in mA * voltage in mV == power in uW */ const unsigned int power = abs(output_voltage * curr); return snprintf(buf, PAGE_SIZE, "%u\n", power);}static ssize_t ltc4215_show_alarm(struct device *dev, struct device_attribute *da, char *buf)static ssize_t ltc4215_alarm_show(struct device *dev, struct device_attribute *da, char *buf){ struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct ltc4215_data *data = ltc4215_update_device(dev); const u8 reg = data->regs[LTC4215_STATUS]; const u32 mask = attr->index; return snprintf(buf, PAGE_SIZE, "%u\n", !!(reg & mask));}/* * These macros are used below in constructing device attribute objects * for use with sysfs_create_group() to make a sysfs device file * for each register. *//* Construct a sensor_device_attribute structure for each register *//* Current */static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ltc4215_show_current, NULL, 0);static SENSOR_DEVICE_ATTR(curr1_max_alarm, S_IRUGO, ltc4215_show_alarm, NULL, 1 << 2);static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc4215_current, 0);static SENSOR_DEVICE_ATTR_RO(curr1_max_alarm, ltc4215_alarm, 1 << 2);/* Power (virtual) */static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ltc4215_show_power, NULL, 0);static SENSOR_DEVICE_ATTR_RO(power1_input, ltc4215_power, 0);/* Input Voltage */static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ltc4215_show_voltage, NULL, LTC4215_ADIN);static SENSOR_DEVICE_ATTR(in1_max_alarm, S_IRUGO, ltc4215_show_alarm, NULL, 1 << 0);static SENSOR_DEVICE_ATTR(in1_min_alarm, S_IRUGO, ltc4215_show_alarm, NULL, 1 << 1);static SENSOR_DEVICE_ATTR_RO(in1_input, ltc4215_voltage, LTC4215_ADIN);static SENSOR_DEVICE_ATTR_RO(in1_max_alarm, ltc4215_alarm, 1 << 0);static SENSOR_DEVICE_ATTR_RO(in1_min_alarm, ltc4215_alarm, 1 << 1);/* Output Voltage */static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, ltc4215_show_voltage, NULL, LTC4215_SOURCE);static SENSOR_DEVICE_ATTR(in2_min_alarm, S_IRUGO, ltc4215_show_alarm, NULL, 1 << 3);static SENSOR_DEVICE_ATTR_RO(in2_input, ltc4215_voltage, LTC4215_SOURCE);static SENSOR_DEVICE_ATTR_RO(in2_min_alarm, ltc4215_alarm, 1 << 3);/* * Finally, construct an array of pointers to members of the above objects, * as required for sysfs_create_group() */static struct attribute *ltc4215_attrs[] = { &sensor_dev_attr_curr1_input.dev_attr.attr, &sensor_dev_attr_curr1_max_alarm.dev_attr.attr, &sensor_dev_attr_power1_input.dev_attr.attr,