![Linus Torvalds](/assets/img/avatar_default.png)
Here's the set of driver core patches for 3.19-rc1. They are dominated by the removal of the .owner field in platform drivers. They touch a lot of files, but they are "simple" changes, just removing a line in a structure. Other than that, a few minor driver core and debugfs changes. There are some ath9k patches coming in through this tree that have been acked by the wireless maintainers as they relied on the debugfs changes. Everything has been in linux-next for a while. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEABECAAYFAlSOD20ACgkQMUfUDdst+ylLPACg2QrW1oHhdTMT9WI8jihlHVRM 53kAoLeteByQ3iVwWurwwseRPiWa8+MI =OVRS -----END PGP SIGNATURE----- Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core Pull driver core update from Greg KH: "Here's the set of driver core patches for 3.19-rc1. They are dominated by the removal of the .owner field in platform drivers. They touch a lot of files, but they are "simple" changes, just removing a line in a structure. Other than that, a few minor driver core and debugfs changes. There are some ath9k patches coming in through this tree that have been acked by the wireless maintainers as they relied on the debugfs changes. Everything has been in linux-next for a while" * tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits) Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries" fs: debugfs: add forward declaration for struct device type firmware class: Deletion of an unnecessary check before the function call "vunmap" firmware loader: fix hung task warning dump devcoredump: provide a one-way disable function device: Add dev_<level>_once variants ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries ath: use seq_file api for ath9k debugfs files debugfs: add helper function to create device related seq_file drivers/base: cacheinfo: remove noisy error boot message Revert "core: platform: add warning if driver has no owner" drivers: base: support cpu cache information interface to userspace via sysfs drivers: base: add cpu_device_create to support per-cpu devices topology: replace custom attribute macros with standard DEVICE_ATTR* cpumask: factor out show_cpumap into separate helper function driver core: Fix unbalanced device reference in drivers_probe driver core: fix race with userland in device_add() sysfs/kernfs: make read requests on pre-alloc files use the buffer. sysfs/kernfs: allow attributes to request write buffer be pre-allocated. fs: sysfs: return EGBIG on write if offset is larger than file size ...
325 lines
7.9 KiB
C
325 lines
7.9 KiB
C
/*
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* IBM PowerNV platform sensors for temperature/fan/voltage/power
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* Copyright (C) 2014 IBM
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program.
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*/
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#define DRVNAME "ibmpowernv"
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#define pr_fmt(fmt) DRVNAME ": " fmt
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <asm/opal.h>
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#include <linux/err.h>
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#define MAX_ATTR_LEN 32
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/* Sensor suffix name from DT */
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#define DT_FAULT_ATTR_SUFFIX "faulted"
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#define DT_DATA_ATTR_SUFFIX "data"
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#define DT_THRESHOLD_ATTR_SUFFIX "thrs"
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/*
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* Enumerates all the types of sensors in the POWERNV platform and does index
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* into 'struct sensor_group'
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*/
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enum sensors {
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FAN,
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AMBIENT_TEMP,
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POWER_SUPPLY,
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POWER_INPUT,
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MAX_SENSOR_TYPE,
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};
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static struct sensor_group {
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const char *name;
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const char *compatible;
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struct attribute_group group;
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u32 attr_count;
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} sensor_groups[] = {
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{"fan", "ibm,opal-sensor-cooling-fan"},
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{"temp", "ibm,opal-sensor-amb-temp"},
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{"in", "ibm,opal-sensor-power-supply"},
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{"power", "ibm,opal-sensor-power"}
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};
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struct sensor_data {
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u32 id; /* An opaque id of the firmware for each sensor */
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enum sensors type;
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char name[MAX_ATTR_LEN];
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struct device_attribute dev_attr;
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};
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struct platform_data {
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const struct attribute_group *attr_groups[MAX_SENSOR_TYPE + 1];
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u32 sensors_count; /* Total count of sensors from each group */
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};
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static ssize_t show_sensor(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_data *sdata = container_of(devattr, struct sensor_data,
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dev_attr);
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ssize_t ret;
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u32 x;
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ret = opal_get_sensor_data(sdata->id, &x);
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if (ret)
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return ret;
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/* Convert temperature to milli-degrees */
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if (sdata->type == AMBIENT_TEMP)
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x *= 1000;
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/* Convert power to micro-watts */
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else if (sdata->type == POWER_INPUT)
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x *= 1000000;
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return sprintf(buf, "%u\n", x);
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}
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static int get_sensor_index_attr(const char *name, u32 *index,
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char *attr)
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{
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char *hash_pos = strchr(name, '#');
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char buf[8] = { 0 };
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char *dash_pos;
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u32 copy_len;
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int err;
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if (!hash_pos)
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return -EINVAL;
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dash_pos = strchr(hash_pos, '-');
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if (!dash_pos)
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return -EINVAL;
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copy_len = dash_pos - hash_pos - 1;
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if (copy_len >= sizeof(buf))
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return -EINVAL;
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strncpy(buf, hash_pos + 1, copy_len);
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err = kstrtou32(buf, 10, index);
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if (err)
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return err;
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strncpy(attr, dash_pos + 1, MAX_ATTR_LEN);
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return 0;
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}
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/*
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* This function translates the DT node name into the 'hwmon' attribute name.
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* IBMPOWERNV device node appear like cooling-fan#2-data, amb-temp#1-thrs etc.
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* which need to be mapped as fan2_input, temp1_max respectively before
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* populating them inside hwmon device class.
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*/
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static int create_hwmon_attr_name(struct device *dev, enum sensors type,
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const char *node_name,
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char *hwmon_attr_name)
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{
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char attr_suffix[MAX_ATTR_LEN];
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char *attr_name;
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u32 index;
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int err;
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err = get_sensor_index_attr(node_name, &index, attr_suffix);
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if (err) {
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dev_err(dev, "Sensor device node name '%s' is invalid\n",
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node_name);
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return err;
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}
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if (!strcmp(attr_suffix, DT_FAULT_ATTR_SUFFIX)) {
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attr_name = "fault";
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} else if (!strcmp(attr_suffix, DT_DATA_ATTR_SUFFIX)) {
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attr_name = "input";
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} else if (!strcmp(attr_suffix, DT_THRESHOLD_ATTR_SUFFIX)) {
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if (type == AMBIENT_TEMP)
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attr_name = "max";
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else if (type == FAN)
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attr_name = "min";
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else
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return -ENOENT;
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} else {
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return -ENOENT;
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}
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snprintf(hwmon_attr_name, MAX_ATTR_LEN, "%s%d_%s",
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sensor_groups[type].name, index, attr_name);
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return 0;
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}
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static int populate_attr_groups(struct platform_device *pdev)
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{
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struct platform_data *pdata = platform_get_drvdata(pdev);
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const struct attribute_group **pgroups = pdata->attr_groups;
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struct device_node *opal, *np;
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enum sensors type;
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opal = of_find_node_by_path("/ibm,opal/sensors");
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for_each_child_of_node(opal, np) {
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if (np->name == NULL)
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continue;
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for (type = 0; type < MAX_SENSOR_TYPE; type++)
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if (of_device_is_compatible(np,
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sensor_groups[type].compatible)) {
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sensor_groups[type].attr_count++;
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break;
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}
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}
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of_node_put(opal);
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for (type = 0; type < MAX_SENSOR_TYPE; type++) {
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sensor_groups[type].group.attrs = devm_kzalloc(&pdev->dev,
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sizeof(struct attribute *) *
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(sensor_groups[type].attr_count + 1),
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GFP_KERNEL);
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if (!sensor_groups[type].group.attrs)
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return -ENOMEM;
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pgroups[type] = &sensor_groups[type].group;
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pdata->sensors_count += sensor_groups[type].attr_count;
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sensor_groups[type].attr_count = 0;
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}
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return 0;
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}
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/*
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* Iterate through the device tree for each child of 'sensors' node, create
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* a sysfs attribute file, the file is named by translating the DT node name
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* to the name required by the higher 'hwmon' driver like fan1_input, temp1_max
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* etc..
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*/
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static int create_device_attrs(struct platform_device *pdev)
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{
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struct platform_data *pdata = platform_get_drvdata(pdev);
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const struct attribute_group **pgroups = pdata->attr_groups;
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struct device_node *opal, *np;
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struct sensor_data *sdata;
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u32 sensor_id;
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enum sensors type;
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u32 count = 0;
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int err = 0;
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opal = of_find_node_by_path("/ibm,opal/sensors");
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sdata = devm_kzalloc(&pdev->dev, pdata->sensors_count * sizeof(*sdata),
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GFP_KERNEL);
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if (!sdata) {
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err = -ENOMEM;
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goto exit_put_node;
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}
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for_each_child_of_node(opal, np) {
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if (np->name == NULL)
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continue;
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for (type = 0; type < MAX_SENSOR_TYPE; type++)
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if (of_device_is_compatible(np,
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sensor_groups[type].compatible))
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break;
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if (type == MAX_SENSOR_TYPE)
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continue;
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if (of_property_read_u32(np, "sensor-id", &sensor_id)) {
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dev_info(&pdev->dev,
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"'sensor-id' missing in the node '%s'\n",
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np->name);
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continue;
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}
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sdata[count].id = sensor_id;
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sdata[count].type = type;
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err = create_hwmon_attr_name(&pdev->dev, type, np->name,
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sdata[count].name);
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if (err)
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goto exit_put_node;
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sysfs_attr_init(&sdata[count].dev_attr.attr);
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sdata[count].dev_attr.attr.name = sdata[count].name;
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sdata[count].dev_attr.attr.mode = S_IRUGO;
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sdata[count].dev_attr.show = show_sensor;
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pgroups[type]->attrs[sensor_groups[type].attr_count++] =
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&sdata[count++].dev_attr.attr;
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}
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exit_put_node:
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of_node_put(opal);
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return err;
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}
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static int ibmpowernv_probe(struct platform_device *pdev)
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{
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struct platform_data *pdata;
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struct device *hwmon_dev;
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int err;
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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platform_set_drvdata(pdev, pdata);
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pdata->sensors_count = 0;
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err = populate_attr_groups(pdev);
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if (err)
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return err;
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/* Create sysfs attribute data for each sensor found in the DT */
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err = create_device_attrs(pdev);
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if (err)
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return err;
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/* Finally, register with hwmon */
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hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, DRVNAME,
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pdata,
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pdata->attr_groups);
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return PTR_ERR_OR_ZERO(hwmon_dev);
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}
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static const struct platform_device_id opal_sensor_driver_ids[] = {
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{
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.name = "opal-sensor",
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},
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{ }
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};
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MODULE_DEVICE_TABLE(platform, opal_sensor_driver_ids);
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static struct platform_driver ibmpowernv_driver = {
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.probe = ibmpowernv_probe,
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.id_table = opal_sensor_driver_ids,
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.driver = {
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.name = DRVNAME,
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},
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};
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module_platform_driver(ibmpowernv_driver);
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MODULE_AUTHOR("Neelesh Gupta <neelegup@linux.vnet.ibm.com>");
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MODULE_DESCRIPTION("IBM POWERNV platform sensors");
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MODULE_LICENSE("GPL");
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