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ntb: idt: Add basic hwmon sysfs interface
IDT PCIe switches provide an embedded temperature sensor working within [0; 127.5]C with resolution of 0.5C. They also can generate a PCIe upstream interrupt in case if the temperature passes through specified thresholds. Since this thresholds interface is very broken the created hwmon-sysfs interface exposes only the next set of hwmon nodes: current input temperature, lowest and highest values measured, history resetting, value offset. HWmon alarm interface isn't provided. IDT PCIe switch also've got an ADC/filter settings of the sensor. This driver doesn't expose them to the hwmon-sysfs interface at the moment, except the offset node. Signed-off-by: Serge Semin <fancer.lancer@gmail.com> Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Serge Semin
Jon Mason
parent
40070408f5
commit
aed1b7b311
@ -1,6 +1,7 @@
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config NTB_IDT
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tristate "IDT PCIe-switch Non-Transparent Bridge support"
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depends on PCI
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select HWMON
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help
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This driver supports NTB of cappable IDT PCIe-switches.
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@ -49,11 +49,14 @@
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include <linux/pci.h>
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#include <linux/aer.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/debugfs.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/ntb.h>
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#include "ntb_hw_idt.h"
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@ -1924,6 +1927,153 @@ static void idt_read_temp(struct idt_ntb_dev *ndev,
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*val = idt_get_temp_uval(data);
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}
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/*
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* idt_write_temp() - write temperature to the chip sensor register
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* @ntb: NTB device context.
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* @type: IN - type of the temperature value to change
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* @val: IN - integer value of temperature in millidegree Celsius
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*/
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static void idt_write_temp(struct idt_ntb_dev *ndev,
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const enum idt_temp_val type, const long val)
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{
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unsigned int reg;
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u32 data;
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u8 fmt;
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/* Retrieve the properly formatted temperature value */
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fmt = idt_temp_get_fmt(val);
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mutex_lock(&ndev->hwmon_mtx);
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switch (type) {
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case IDT_TEMP_LOW:
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reg = IDT_SW_TMPALARM;
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data = SET_FIELD(TMPALARM_LTEMP, idt_sw_read(ndev, reg), fmt) &
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~IDT_TMPALARM_IRQ_MASK;
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break;
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case IDT_TEMP_HIGH:
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reg = IDT_SW_TMPALARM;
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data = SET_FIELD(TMPALARM_HTEMP, idt_sw_read(ndev, reg), fmt) &
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~IDT_TMPALARM_IRQ_MASK;
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break;
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case IDT_TEMP_OFFSET:
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reg = IDT_SW_TMPADJ;
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data = SET_FIELD(TMPADJ_OFFSET, idt_sw_read(ndev, reg), fmt);
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break;
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default:
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goto inval_spin_unlock;
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}
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idt_sw_write(ndev, reg, data);
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inval_spin_unlock:
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mutex_unlock(&ndev->hwmon_mtx);
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}
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/*
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* idt_sysfs_show_temp() - printout corresponding temperature value
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* @dev: Pointer to the NTB device structure
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* @da: Sensor device attribute structure
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* @buf: Buffer to print temperature out
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*
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* Return: Number of written symbols or negative error
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*/
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static ssize_t idt_sysfs_show_temp(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 idt_ntb_dev *ndev = dev_get_drvdata(dev);
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enum idt_temp_val type = attr->index;
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long mdeg;
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idt_read_temp(ndev, type, &mdeg);
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return sprintf(buf, "%ld\n", mdeg);
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}
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/*
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* idt_sysfs_set_temp() - set corresponding temperature value
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* @dev: Pointer to the NTB device structure
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* @da: Sensor device attribute structure
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* @buf: Buffer to print temperature out
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* @count: Size of the passed buffer
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*
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* Return: Number of written symbols or negative error
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*/
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static ssize_t idt_sysfs_set_temp(struct device *dev,
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struct device_attribute *da, const char *buf,
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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 idt_ntb_dev *ndev = dev_get_drvdata(dev);
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enum idt_temp_val type = attr->index;
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long mdeg;
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int ret;
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ret = kstrtol(buf, 10, &mdeg);
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if (ret)
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return ret;
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/* Clamp the passed value in accordance with the type */
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if (type == IDT_TEMP_OFFSET)
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mdeg = clamp_val(mdeg, IDT_TEMP_MIN_OFFSET,
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IDT_TEMP_MAX_OFFSET);
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else
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mdeg = clamp_val(mdeg, IDT_TEMP_MIN_MDEG, IDT_TEMP_MAX_MDEG);
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idt_write_temp(ndev, type, mdeg);
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return count;
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}
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/*
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* idt_sysfs_reset_hist() - reset temperature history
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* @dev: Pointer to the NTB device structure
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* @da: Sensor device attribute structure
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* @buf: Buffer to print temperature out
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* @count: Size of the passed buffer
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*
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* Return: Number of written symbols or negative error
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*/
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static ssize_t idt_sysfs_reset_hist(struct device *dev,
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struct device_attribute *da,
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const char *buf, size_t count)
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{
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struct idt_ntb_dev *ndev = dev_get_drvdata(dev);
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/* Just set the maximal value to the lowest temperature field and
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* minimal value to the highest temperature field
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*/
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idt_write_temp(ndev, IDT_TEMP_LOW, IDT_TEMP_MAX_MDEG);
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idt_write_temp(ndev, IDT_TEMP_HIGH, IDT_TEMP_MIN_MDEG);
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return count;
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}
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/*
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* Hwmon IDT sysfs attributes
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*/
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static SENSOR_DEVICE_ATTR(temp1_input, 0444, idt_sysfs_show_temp, NULL,
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IDT_TEMP_CUR);
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static SENSOR_DEVICE_ATTR(temp1_lowest, 0444, idt_sysfs_show_temp, NULL,
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IDT_TEMP_LOW);
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static SENSOR_DEVICE_ATTR(temp1_highest, 0444, idt_sysfs_show_temp, NULL,
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IDT_TEMP_HIGH);
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static SENSOR_DEVICE_ATTR(temp1_offset, 0644, idt_sysfs_show_temp,
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idt_sysfs_set_temp, IDT_TEMP_OFFSET);
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static DEVICE_ATTR(temp1_reset_history, 0200, NULL, idt_sysfs_reset_hist);
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/*
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* Hwmon IDT sysfs attributes group
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*/
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static struct attribute *idt_temp_attrs[] = {
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_lowest.dev_attr.attr,
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&sensor_dev_attr_temp1_highest.dev_attr.attr,
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&sensor_dev_attr_temp1_offset.dev_attr.attr,
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&dev_attr_temp1_reset_history.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(idt_temp);
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/*
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* idt_temp_isr() - temperature sensor alarm events ISR
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* @ndev: IDT NTB hardware driver descriptor
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@ -1956,6 +2106,35 @@ static void idt_temp_isr(struct idt_ntb_dev *ndev, u32 ntint_sts)
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idt_get_deg(mdeg), idt_get_deg_frac(mdeg));
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}
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/*
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* idt_init_temp() - initialize temperature sensor interface
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* @ndev: IDT NTB hardware driver descriptor
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*
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* Simple sensor initializarion method is responsible for device switching
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* on and resource management based hwmon interface registration. Note, that
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* since the device is shared we won't disable it on remove, but leave it
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* working until the system is powered off.
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*/
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static void idt_init_temp(struct idt_ntb_dev *ndev)
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{
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struct device *hwmon;
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/* Enable sensor if it hasn't been already */
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idt_sw_write(ndev, IDT_SW_TMPCTL, 0x0);
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/* Initialize hwmon interface fields */
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mutex_init(&ndev->hwmon_mtx);
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hwmon = devm_hwmon_device_register_with_groups(&ndev->ntb.pdev->dev,
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ndev->swcfg->name, ndev, idt_temp_groups);
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if (IS_ERR(hwmon)) {
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dev_err(&ndev->ntb.pdev->dev, "Couldn't create hwmon device");
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return;
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}
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dev_dbg(&ndev->ntb.pdev->dev, "Temperature HWmon interface registered");
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}
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/*=============================================================================
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* 8. ISRs related operations
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*
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@ -2650,6 +2829,9 @@ static int idt_pci_probe(struct pci_dev *pdev,
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/* Initialize Messaging subsystem */
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idt_init_msg(ndev);
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/* Initialize hwmon interface */
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idt_init_temp(ndev);
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/* Initialize IDT interrupts handler */
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ret = idt_init_isr(ndev);
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if (ret != 0)
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@ -47,9 +47,9 @@
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#include <linux/pci_ids.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include <linux/ntb.h>
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/*
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* Macro is used to create the struct pci_device_id that matches
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* the supported IDT PCIe-switches
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@ -907,6 +907,10 @@
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* TMPSTS register fields related constants
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* @IDT_TMPSTS_TEMP_MASK: Current temperature field mask
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* @IDT_TMPSTS_TEMP_FLD: Current temperature field offset
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* @IDT_TMPSTS_LTEMP_MASK: Lowest temperature field mask
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* @IDT_TMPSTS_LTEMP_FLD: Lowest temperature field offset
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* @IDT_TMPSTS_HTEMP_MASK: Highest temperature field mask
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* @IDT_TMPSTS_HTEMP_FLD: Highest temperature field offset
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*/
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#define IDT_TMPSTS_TEMP_MASK 0x000000FFU
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#define IDT_TMPSTS_TEMP_FLD 0
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@ -915,6 +919,20 @@
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#define IDT_TMPSTS_HTEMP_MASK 0x00FF0000U
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#define IDT_TMPSTS_HTEMP_FLD 16
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/*
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* TMPALARM register fields related constants
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* @IDT_TMPALARM_LTEMP_MASK: Lowest temperature field mask
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* @IDT_TMPALARM_LTEMP_FLD: Lowest temperature field offset
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* @IDT_TMPALARM_HTEMP_MASK: Highest temperature field mask
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* @IDT_TMPALARM_HTEMP_FLD: Highest temperature field offset
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* @IDT_TMPALARM_IRQ_MASK: Alarm IRQ status mask
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*/
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#define IDT_TMPALARM_LTEMP_MASK 0x0000FF00U
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#define IDT_TMPALARM_LTEMP_FLD 8
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#define IDT_TMPALARM_HTEMP_MASK 0x00FF0000U
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#define IDT_TMPALARM_HTEMP_FLD 16
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#define IDT_TMPALARM_IRQ_MASK 0x3F000000U
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/*
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* TMPADJ register fields related constants
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* @IDT_TMPADJ_OFFSET_MASK: Temperature value offset field mask
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@ -1100,6 +1118,8 @@ struct idt_ntb_peer {
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* @msg_mask_lock: Message mask register lock
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* @gasa_lock: GASA registers access lock
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*
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* @hwmon_mtx: Temperature sensor interface update mutex
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*
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* @dbgfs_info: DebugFS info node
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*/
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struct idt_ntb_dev {
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@ -1127,6 +1147,8 @@ struct idt_ntb_dev {
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spinlock_t msg_mask_lock;
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spinlock_t gasa_lock;
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struct mutex hwmon_mtx;
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struct dentry *dbgfs_info;
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};
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#define to_ndev_ntb(__ntb) container_of(__ntb, struct idt_ntb_dev, ntb)
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