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Date: Wed, 20 May 2015 08:18:06 +0000
From: "Izumi, Taku" <izumi.taku@...fujitsu.com>
To: "platform-driver-x86@...r.kernel.org"
<platform-driver-x86@...r.kernel.org>
CC: "Hart, Darren" <darren.hart@...el.com>,
"rkhan@...hat.com" <rkhan@...hat.com>,
"alexander.h.duyck@...hat.com" <alexander.h.duyck@...hat.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: [PATCH 2/7] fjes: Implement acpi_driver functionality
This patch adds implementation of "PNP0C02" acpi_device driver
to FUJITSU Extended Socket Network Device driver.
When "PNP0C02" is found in ACPI DSDT, it evaluates "_STR"
to check if "PNP0C02" is for Extended Socket device driver
and retrieves ACPI resource information.
Signed-off-by: Taku Izumi <izumi.taku@...fujitsu.com>
---
drivers/platform/x86/fjes/fjes.h | 4 ++
drivers/platform/x86/fjes/fjes_main.c | 116 ++++++++++++++++++++++++++++++++++
2 files changed, 120 insertions(+)
diff --git a/drivers/platform/x86/fjes/fjes.h b/drivers/platform/x86/fjes/fjes.h
index f12fe11..5586305 100644
--- a/drivers/platform/x86/fjes/fjes.h
+++ b/drivers/platform/x86/fjes/fjes.h
@@ -23,6 +23,10 @@
#ifndef FJES_H_
#define FJES_H_
+#include <linux/acpi.h>
+
+#define FJES_ACPI_SYMBOL "Extended Socket"
+
extern char fjes_driver_name[];
extern char fjes_driver_version[];
extern u32 fjes_support_mtu[];
diff --git a/drivers/platform/x86/fjes/fjes_main.c b/drivers/platform/x86/fjes/fjes_main.c
index f1e2fa0..3454098 100644
--- a/drivers/platform/x86/fjes/fjes_main.c
+++ b/drivers/platform/x86/fjes/fjes_main.c
@@ -21,6 +21,7 @@
#include <linux/module.h>
#include <linux/types.h>
+#include <linux/nls.h>
#include "fjes.h"
@@ -42,6 +43,42 @@ MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
+static int fjes_acpi_add(struct acpi_device *);
+static int fjes_acpi_remove(struct acpi_device *);
+static acpi_status fjes_get_acpi_resource(struct acpi_resource *, void*);
+
+
+static const struct acpi_device_id fjes_acpi_ids[] = {
+ {"PNP0C02", 0},
+ {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, fjes_acpi_ids);
+
+static struct acpi_driver fjes_acpi_driver = {
+ .name = DRV_NAME,
+ .class = DRV_NAME,
+ .owner = THIS_MODULE,
+ .ids = fjes_acpi_ids,
+ .ops = {
+ .add = fjes_acpi_add,
+ .remove = fjes_acpi_remove,
+ },
+};
+
+static struct resource fjes_resource[] = {
+ {
+ .flags = IORESOURCE_MEM,
+ .start = 0,
+ .end = 0,
+ },
+ {
+ .flags = IORESOURCE_IRQ,
+ .start = 0,
+ .end = 0,
+ },
+};
+
+
/*
* fjes_init_module - Driver Registration Routine
*
@@ -50,11 +87,20 @@ MODULE_VERSION(DRV_VERSION);
*/
static int __init fjes_init_module(void)
{
+ int result;
+
pr_info("%s - version %s\n",
fjes_driver_string, fjes_driver_version);
pr_info("%s\n", fjes_copyright);
+ result = acpi_bus_register_driver(&fjes_acpi_driver);
+ if (result < 0)
+ goto fail_acpi_driver;
+
return 0;
+
+fail_acpi_driver:
+ return result;
}
module_init(fjes_init_module);
@@ -67,8 +113,78 @@ module_init(fjes_init_module);
*/
static void __exit fjes_exit_module(void)
{
+ acpi_bus_unregister_driver(&fjes_acpi_driver);
}
module_exit(fjes_exit_module);
+static int fjes_acpi_add(struct acpi_device *device)
+{
+ acpi_status status;
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
+ union acpi_object *str;
+ char str_buf[sizeof(FJES_ACPI_SYMBOL) + 1];
+ int result;
+
+ status = acpi_evaluate_object(device->handle, "_STR", NULL, &buffer);
+ if (ACPI_FAILURE(status))
+ return -ENODEV;
+
+ str = buffer.pointer;
+ result = utf16s_to_utf8s((wchar_t *)str->string.pointer,
+ str->string.length, UTF16_LITTLE_ENDIAN,
+ str_buf, sizeof(str_buf) - 1);
+ str_buf[result] = 0;
+
+ if (strncmp(FJES_ACPI_SYMBOL, str_buf, strlen(FJES_ACPI_SYMBOL)) != 0) {
+ kfree(buffer.pointer);
+ return -ENODEV;
+ }
+ kfree(buffer.pointer);
+
+ status = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
+ fjes_get_acpi_resource, fjes_resource);
+ if (ACPI_FAILURE(status))
+ return -ENODEV;
+
+ return 0;
+}
+
+static int fjes_acpi_remove(struct acpi_device *device)
+{
+ return 0;
+}
+
+static acpi_status fjes_get_acpi_resource(struct acpi_resource *acpi_res,
+ void *data)
+{
+ struct resource *res = data;
+ struct acpi_resource_address32 *addr;
+ struct acpi_resource_irq *irq;
+
+ switch (acpi_res->type) {
+ case ACPI_RESOURCE_TYPE_ADDRESS32:
+ addr = &acpi_res->data.address32;
+ res[0].start = addr->address.minimum;
+ res[0].end = addr->address.minimum +
+ addr->address.address_length;
+ break;
+
+ case ACPI_RESOURCE_TYPE_IRQ:
+ irq = &acpi_res->data.irq;
+ if (irq->interrupt_count != 1)
+ return AE_ERROR;
+ res[1].start = irq->interrupts[0];
+ res[1].end = irq->interrupts[0];
+ break;
+
+ default:
+ break;
+ }
+
+ return AE_OK;
+}
+
+
+
--
1.8.3.1
--
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