+++ /dev/null
-/*
- * PowerNV OPAL Power-Shift-Ratio interface
- *
- * Copyright 2017 IBM Corp.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#define pr_fmt(fmt) "opal-psr: " fmt
-
-#include <linux/of.h>
-#include <linux/kobject.h>
-#include <linux/slab.h>
-
-#include <asm/opal.h>
-
-DEFINE_MUTEX(psr_mutex);
-
-static struct kobject *psr_kobj;
-
-struct psr_attr {
- u32 handle;
- struct kobj_attribute attr;
-} *psr_attrs;
-
-static ssize_t psr_show(struct kobject *kobj, struct kobj_attribute *attr,
- char *buf)
-{
- struct psr_attr *psr_attr = container_of(attr, struct psr_attr, attr);
- struct opal_msg msg;
- int psr, ret, token;
-
- token = opal_async_get_token_interruptible();
- if (token < 0) {
- pr_devel("Failed to get token\n");
- return token;
- }
-
- ret = mutex_lock_interruptible(&psr_mutex);
- if (ret)
- goto out_token;
-
- ret = opal_get_power_shift_ratio(psr_attr->handle, token,
- (u32 *)__pa(&psr));
- switch (ret) {
- case OPAL_ASYNC_COMPLETION:
- ret = opal_async_wait_response(token, &msg);
- if (ret) {
- pr_devel("Failed to wait for the async response\n");
- ret = -EIO;
- goto out;
- }
- ret = opal_error_code(opal_get_async_rc(msg));
- if (!ret) {
- ret = sprintf(buf, "%u\n", be32_to_cpu(psr));
- if (ret < 0)
- ret = -EIO;
- }
- break;
- case OPAL_SUCCESS:
- ret = sprintf(buf, "%u\n", be32_to_cpu(psr));
- if (ret < 0)
- ret = -EIO;
- break;
- default:
- ret = opal_error_code(ret);
- }
-
-out:
- mutex_unlock(&psr_mutex);
-out_token:
- opal_async_release_token(token);
- return ret;
-}
-
-static ssize_t psr_store(struct kobject *kobj, struct kobj_attribute *attr,
- const char *buf, size_t count)
-{
- struct psr_attr *psr_attr = container_of(attr, struct psr_attr, attr);
- struct opal_msg msg;
- int psr, ret, token;
-
- ret = kstrtoint(buf, 0, &psr);
- if (ret)
- return ret;
-
- token = opal_async_get_token_interruptible();
- if (token < 0) {
- pr_devel("Failed to get token\n");
- return token;
- }
-
- ret = mutex_lock_interruptible(&psr_mutex);
- if (ret)
- goto out_token;
-
- ret = opal_set_power_shift_ratio(psr_attr->handle, token, psr);
- switch (ret) {
- case OPAL_ASYNC_COMPLETION:
- ret = opal_async_wait_response(token, &msg);
- if (ret) {
- pr_devel("Failed to wait for the async response\n");
- ret = -EIO;
- goto out;
- }
- ret = opal_error_code(opal_get_async_rc(msg));
- if (!ret)
- ret = count;
- break;
- case OPAL_SUCCESS:
- ret = count;
- break;
- default:
- ret = opal_error_code(ret);
- }
-
-out:
- mutex_unlock(&psr_mutex);
-out_token:
- opal_async_release_token(token);
- return ret;
-}
-
-void __init opal_psr_init(void)
-{
- struct device_node *psr, *node;
- int i = 0;
-
- psr = of_find_compatible_node(NULL, NULL,
- "ibm,opal-power-shift-ratio");
- if (!psr) {
- pr_devel("Power-shift-ratio node not found\n");
- return;
- }
-
- psr_attrs = kcalloc(of_get_child_count(psr), sizeof(struct psr_attr),
- GFP_KERNEL);
- if (!psr_attrs)
- return;
-
- psr_kobj = kobject_create_and_add("psr", opal_kobj);
- if (!psr_kobj) {
- pr_warn("Failed to create psr kobject\n");
- goto out;
- }
-
- for_each_child_of_node(psr, node) {
- if (of_property_read_u32(node, "handle",
- &psr_attrs[i].handle))
- goto out_kobj;
-
- sysfs_attr_init(&psr_attrs[i].attr.attr);
- if (of_property_read_string(node, "label",
- &psr_attrs[i].attr.attr.name))
- goto out_kobj;
- psr_attrs[i].attr.attr.mode = 0664;
- psr_attrs[i].attr.show = psr_show;
- psr_attrs[i].attr.store = psr_store;
- if (sysfs_create_file(psr_kobj, &psr_attrs[i].attr.attr)) {
- pr_devel("Failed to create psr sysfs file %s\n",
- psr_attrs[i].attr.attr.name);
- goto out_kobj;
- }
- i++;
- }
-
- return;
-out_kobj:
- kobject_put(psr_kobj);
-out:
- kfree(psr_attrs);
-}
projects / mirror_ubuntu-artful-kernel.git / commitdiff