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c31e73121f
Soc framework exposed sysfs entries are not sufficient for some of the h/w platforms. Currently there is no interface where soc drivers can expose further information about their SoCs via soc framework. This change address this limitation where clients can pass their custom entries as attribute group and soc framework would expose them as sysfs properties. Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Reviewed-by: Stephen Boyd <swboyd@chromium.org> Link: https://lore.kernel.org/r/1570480662-25252-1-git-send-email-mnalajal@codeaurora.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
272 lines
6.8 KiB
C
272 lines
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) ST-Ericsson SA 2011
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*
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* Author: Lee Jones <lee.jones@linaro.org> for ST-Ericsson.
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*/
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#include <linux/sysfs.h>
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#include <linux/init.h>
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#include <linux/stat.h>
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#include <linux/slab.h>
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#include <linux/idr.h>
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#include <linux/spinlock.h>
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#include <linux/sys_soc.h>
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#include <linux/err.h>
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#include <linux/glob.h>
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static DEFINE_IDA(soc_ida);
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static ssize_t soc_info_get(struct device *dev,
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struct device_attribute *attr,
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char *buf);
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struct soc_device {
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struct device dev;
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struct soc_device_attribute *attr;
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int soc_dev_num;
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};
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static struct bus_type soc_bus_type = {
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.name = "soc",
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};
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static DEVICE_ATTR(machine, S_IRUGO, soc_info_get, NULL);
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static DEVICE_ATTR(family, S_IRUGO, soc_info_get, NULL);
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static DEVICE_ATTR(serial_number, S_IRUGO, soc_info_get, NULL);
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static DEVICE_ATTR(soc_id, S_IRUGO, soc_info_get, NULL);
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static DEVICE_ATTR(revision, S_IRUGO, soc_info_get, NULL);
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struct device *soc_device_to_device(struct soc_device *soc_dev)
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{
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return &soc_dev->dev;
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}
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static umode_t soc_attribute_mode(struct kobject *kobj,
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struct attribute *attr,
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int index)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
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if ((attr == &dev_attr_machine.attr)
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&& (soc_dev->attr->machine != NULL))
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return attr->mode;
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if ((attr == &dev_attr_family.attr)
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&& (soc_dev->attr->family != NULL))
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return attr->mode;
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if ((attr == &dev_attr_revision.attr)
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&& (soc_dev->attr->revision != NULL))
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return attr->mode;
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if ((attr == &dev_attr_serial_number.attr)
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&& (soc_dev->attr->serial_number != NULL))
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return attr->mode;
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if ((attr == &dev_attr_soc_id.attr)
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&& (soc_dev->attr->soc_id != NULL))
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return attr->mode;
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/* Unknown or unfilled attribute. */
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return 0;
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}
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static ssize_t soc_info_get(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
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if (attr == &dev_attr_machine)
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return sprintf(buf, "%s\n", soc_dev->attr->machine);
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if (attr == &dev_attr_family)
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return sprintf(buf, "%s\n", soc_dev->attr->family);
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if (attr == &dev_attr_revision)
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return sprintf(buf, "%s\n", soc_dev->attr->revision);
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if (attr == &dev_attr_serial_number)
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return sprintf(buf, "%s\n", soc_dev->attr->serial_number);
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if (attr == &dev_attr_soc_id)
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return sprintf(buf, "%s\n", soc_dev->attr->soc_id);
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return -EINVAL;
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}
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static struct attribute *soc_attr[] = {
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&dev_attr_machine.attr,
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&dev_attr_family.attr,
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&dev_attr_serial_number.attr,
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&dev_attr_soc_id.attr,
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&dev_attr_revision.attr,
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NULL,
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};
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static const struct attribute_group soc_attr_group = {
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.attrs = soc_attr,
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.is_visible = soc_attribute_mode,
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};
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static void soc_release(struct device *dev)
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{
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struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
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ida_simple_remove(&soc_ida, soc_dev->soc_dev_num);
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kfree(soc_dev->dev.groups);
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kfree(soc_dev);
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}
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static struct soc_device_attribute *early_soc_dev_attr;
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struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr)
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{
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struct soc_device *soc_dev;
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const struct attribute_group **soc_attr_groups;
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int ret;
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if (!soc_bus_type.p) {
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if (early_soc_dev_attr)
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return ERR_PTR(-EBUSY);
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early_soc_dev_attr = soc_dev_attr;
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return NULL;
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}
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soc_dev = kzalloc(sizeof(*soc_dev), GFP_KERNEL);
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if (!soc_dev) {
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ret = -ENOMEM;
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goto out1;
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}
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soc_attr_groups = kcalloc(3, sizeof(*soc_attr_groups), GFP_KERNEL);
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if (!soc_attr_groups) {
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ret = -ENOMEM;
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goto out2;
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}
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soc_attr_groups[0] = &soc_attr_group;
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soc_attr_groups[1] = soc_dev_attr->custom_attr_group;
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/* Fetch a unique (reclaimable) SOC ID. */
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ret = ida_simple_get(&soc_ida, 0, 0, GFP_KERNEL);
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if (ret < 0)
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goto out3;
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soc_dev->soc_dev_num = ret;
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soc_dev->attr = soc_dev_attr;
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soc_dev->dev.bus = &soc_bus_type;
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soc_dev->dev.groups = soc_attr_groups;
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soc_dev->dev.release = soc_release;
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dev_set_name(&soc_dev->dev, "soc%d", soc_dev->soc_dev_num);
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ret = device_register(&soc_dev->dev);
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if (ret) {
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put_device(&soc_dev->dev);
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return ERR_PTR(ret);
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}
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return soc_dev;
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out3:
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kfree(soc_attr_groups);
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out2:
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kfree(soc_dev);
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out1:
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL_GPL(soc_device_register);
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/* Ensure soc_dev->attr is freed prior to calling soc_device_unregister. */
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void soc_device_unregister(struct soc_device *soc_dev)
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{
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device_unregister(&soc_dev->dev);
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early_soc_dev_attr = NULL;
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}
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EXPORT_SYMBOL_GPL(soc_device_unregister);
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static int __init soc_bus_register(void)
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{
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int ret;
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ret = bus_register(&soc_bus_type);
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if (ret)
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return ret;
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if (early_soc_dev_attr)
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return PTR_ERR(soc_device_register(early_soc_dev_attr));
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return 0;
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}
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core_initcall(soc_bus_register);
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static int soc_device_match_attr(const struct soc_device_attribute *attr,
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const struct soc_device_attribute *match)
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{
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if (match->machine &&
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(!attr->machine || !glob_match(match->machine, attr->machine)))
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return 0;
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if (match->family &&
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(!attr->family || !glob_match(match->family, attr->family)))
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return 0;
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if (match->revision &&
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(!attr->revision || !glob_match(match->revision, attr->revision)))
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return 0;
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if (match->soc_id &&
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(!attr->soc_id || !glob_match(match->soc_id, attr->soc_id)))
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return 0;
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return 1;
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}
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static int soc_device_match_one(struct device *dev, void *arg)
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{
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struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
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return soc_device_match_attr(soc_dev->attr, arg);
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}
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/*
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* soc_device_match - identify the SoC in the machine
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* @matches: zero-terminated array of possible matches
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*
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* returns the first matching entry of the argument array, or NULL
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* if none of them match.
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*
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* This function is meant as a helper in place of of_match_node()
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* in cases where either no device tree is available or the information
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* in a device node is insufficient to identify a particular variant
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* by its compatible strings or other properties. For new devices,
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* the DT binding should always provide unique compatible strings
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* that allow the use of of_match_node() instead.
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*
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* The calling function can use the .data entry of the
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* soc_device_attribute to pass a structure or function pointer for
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* each entry.
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*/
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const struct soc_device_attribute *soc_device_match(
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const struct soc_device_attribute *matches)
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{
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int ret = 0;
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if (!matches)
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return NULL;
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while (!ret) {
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if (!(matches->machine || matches->family ||
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matches->revision || matches->soc_id))
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break;
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ret = bus_for_each_dev(&soc_bus_type, NULL, (void *)matches,
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soc_device_match_one);
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if (ret < 0 && early_soc_dev_attr)
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ret = soc_device_match_attr(early_soc_dev_attr,
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matches);
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if (ret < 0)
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return NULL;
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if (!ret)
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matches++;
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else
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return matches;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(soc_device_match);
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