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Date: Thu, 19 Dec 2013 15:51:45 +0800
From: "Lee, Chun-Yi" <joeyli.kernel@...il.com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>,
Alessandro Zummo <a.zummo@...ertech.it>,
"H. Peter Anvin" <hpa@...or.com>,
Matt Fleming <matt@...sole-pimps.org>,
Matthew Garrett <matthew.garrett@...ula.com>
Cc: Elliott@...com, samer.el-haj-mahmoud@...com,
Oliver Neukum <oneukum@...e.de>, werner@...e.com,
trenn@...e.de, JBeulich@...e.com, linux-kernel@...r.kernel.org,
rtc-linux@...glegroups.com, x86@...nel.org,
"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
linux-acpi@...r.kernel.org, "Lee, Chun-Yi" <jlee@...e.com>
Subject: [RFC PATCH 04/14] ACPI: Add ACPI 5.0 Time and Alarm Device driver
This patch add the driver of Time and Alarm Device in ACPI 5.0.
Currently it only implemented get/set time functions and grab
the capabilities of device when driver initial.
This driver also register rtc-acpitad platform device for RTC ACPITAD
stub driver using.
Signed-off-by: Lee, Chun-Yi <jlee@...e.com>
---
drivers/acpi/Makefile | 3 +
drivers/acpi/acpi_tad.c | 176 +++++++++++++++++++++++++++++++++++++++++++++++
drivers/acpi/bus.c | 3 +
drivers/acpi/internal.h | 5 ++
include/linux/acpi.h | 31 ++++++++
5 files changed, 218 insertions(+), 0 deletions(-)
create mode 100644 drivers/acpi/acpi_tad.c
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 0331f91..d250b15 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -50,6 +50,9 @@ acpi-$(CONFIG_ACPI_NUMA) += numa.o
ifdef CONFIG_ACPI_VIDEO
acpi-y += video_detect.o
endif
+ifdef CONFIG_X86
+acpi-y += acpi_tad.o
+endif
# These are (potentially) separate modules
diff --git a/drivers/acpi/acpi_tad.c b/drivers/acpi/acpi_tad.c
new file mode 100644
index 0000000..c2200f3
--- /dev/null
+++ b/drivers/acpi/acpi_tad.c
@@ -0,0 +1,176 @@
+/* rtc.c - ACPI 5.0 Time and Alarm Driver
+ *
+ * Copyright (C) 2013 SUSE Linux Products GmbH. All rights reserved.
+ * Written by Lee, Chun-Yi (jlee@...e.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <acpi/acpi_drivers.h>
+
+#include <asm/time.h>
+
+#define ACPI_TIME_ALARM_NAME "Time and Alarm"
+ACPI_MODULE_NAME(ACPI_TIME_ALARM_NAME);
+#define ACPI_TIME_ALARM_CLASS "time_alarm"
+
+static const struct acpi_device_id time_alarm_ids[] = {
+ {"ACPI000E", 0},
+ {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, time_alarm_ids);
+
+static struct platform_device rtc_acpitad_dev = {
+ .name = "rtc-acpitad",
+ .id = -1,
+};
+
+static struct acpi_device *acpi_tad_dev;
+static unsigned long long cap;
+
+int acpi_read_time(struct acpi_time *output)
+{
+ unsigned long flags;
+ struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *obj;
+ struct acpi_time *acpit;
+ acpi_status status;
+
+ if (!acpi_tad_dev)
+ return -ENODEV;
+
+ if (!(cap & TAD_CAP_GETSETTIME))
+ return -EINVAL;
+
+ if (!output)
+ return -EINVAL;
+
+ spin_lock_irqsave(&rtc_lock, flags);
+ status = acpi_evaluate_object(acpi_tad_dev->handle, "_GRT", NULL, &result);
+ spin_unlock_irqrestore(&rtc_lock, flags);
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GRT"));
+ return -ENODEV;
+ }
+
+ obj = result.pointer;
+ if (!obj ||
+ obj->type != ACPI_TYPE_BUFFER ||
+ obj->buffer.length > sizeof(struct acpi_time) ||
+ obj->buffer.length < offsetof(struct acpi_time, pad2)) {
+ dev_err(&acpi_tad_dev->dev, ACPI_TIME_ALARM_NAME
+ " Invalid _GRT data\n");
+ return -EINVAL;
+ }
+
+ acpit = (struct acpi_time *) obj->buffer.pointer;
+ if (acpit) {
+ output->year = acpit->year;
+ output->month = acpit->month;
+ output->day = acpit->day;
+ output->hour = acpit->hour;
+ output->minute = acpit->minute;
+ output->second = acpit->second;
+ output->milliseconds = acpit->milliseconds;
+ output->timezone = acpit->timezone;
+ output->daylight = acpit->daylight;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(acpi_read_time);
+
+int acpi_set_time(struct acpi_time *acpit)
+{
+ unsigned long flags;
+ struct acpi_object_list input;
+ union acpi_object params[1];
+ unsigned long long output;
+ acpi_status status;
+
+ if (!acpi_tad_dev)
+ return -ENODEV;
+
+ if (!(cap & TAD_CAP_GETSETTIME))
+ return -EINVAL;
+
+ if (!acpit)
+ return -EINVAL;
+
+ input.count = 1;
+ input.pointer = params;
+ params[0].type = ACPI_TYPE_BUFFER;
+ params[0].buffer.length = sizeof(struct acpi_time);
+ params[0].buffer.pointer = (void *) acpit;
+
+ spin_lock_irqsave(&rtc_lock, flags);
+ status = acpi_evaluate_integer(acpi_tad_dev->handle, "_SRT", &input, &output);
+ spin_unlock_irqrestore(&rtc_lock, flags);
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRT"));
+ return -ENODEV;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(acpi_set_time);
+
+int acpi_tad_get_capability(unsigned long *output)
+{
+ if (!acpi_tad_dev)
+ return -ENODEV;
+
+ *output = cap;
+
+ return 0;
+}
+EXPORT_SYMBOL(acpi_tad_get_capability);
+
+static int acpi_time_alarm_add(struct acpi_device *device)
+{
+ acpi_status status;
+
+ if (!device)
+ return -EINVAL;
+
+ acpi_tad_dev = device;
+
+ /* evaluate _GCP */
+ status = acpi_evaluate_integer(device->handle, "_GCP", NULL, &cap);
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GCP"));
+ return -ENODEV;
+ }
+
+ if (!(cap & TAD_CAP_GETSETTIME))
+ pr_warn(FW_INFO "Get/Set real time features not available.\n");
+
+ if (platform_device_register(&rtc_acpitad_dev) < 0)
+ pr_err("Unable to register rtc-acpitad device\n");
+
+ return 0;
+}
+
+static struct acpi_driver acpi_time_alarm_driver = {
+ .name = "time_and_alarm",
+ .class = ACPI_TIME_ALARM_CLASS,
+ .ids = time_alarm_ids,
+ .ops = {
+ .add = acpi_time_alarm_add,
+ },
+};
+
+int __init acpi_tad_init(void)
+{
+ int result = 0;
+
+ result = acpi_bus_register_driver(&acpi_time_alarm_driver);
+ if (result < 0)
+ return -ENODEV;
+
+ return result;
+}
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index bba9b72..3f7a075 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -689,6 +689,9 @@ static int __init acpi_init(void)
pci_mmcfg_late_init();
acpi_scan_init();
acpi_ec_init();
+#ifdef CONFIG_X86
+ acpi_tad_init();
+#endif
acpi_debugfs_init();
acpi_sleep_proc_init();
acpi_wakeup_device_init();
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index a29739c..9cfe589 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -134,6 +134,11 @@ void acpi_ec_block_transactions(void);
void acpi_ec_unblock_transactions(void);
void acpi_ec_unblock_transactions_early(void);
+/* --------------------------------------------------------------------------
+ Time and Alarm Device
+ -------------------------------------------------------------------------- */
+int acpi_tad_init(void);
+
/*--------------------------------------------------------------------------
Suspend/Resume
-------------------------------------------------------------------------- */
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index d9099b1..c8dc104 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -173,6 +173,37 @@ extern int ec_transaction(u8 command,
u8 *rdata, unsigned rdata_len);
extern acpi_handle ec_get_handle(void);
+/*
+ * Time and Alarm device capability flags
+ */
+#define TAD_CAP_ACWAKE (1<<0)
+#define TAD_CAP_DCWAKE (1<<1)
+#define TAD_CAP_GETSETTIME (1<<2)
+#define TAD_CAP_ACCURACY (1<<3)
+
+#define ACPI_TIME_AFFECTED_BY_DAYLIGHT (1<<0)
+#define ACPI_TIME_ADJUSTED_FOR_DAYLIGHT (1<<1)
+#define ACPI_ISDST (ACPI_TIME_AFFECTED_BY_DAYLIGHT|ACPI_TIME_ADJUSTED_FOR_DAYLIGHT)
+#define ACPI_UNSPECIFIED_TIMEZONE 2047
+
+struct acpi_time {
+ u16 year;
+ u8 month;
+ u8 day;
+ u8 hour;
+ u8 minute;
+ u8 second;
+ u8 pad1;
+ u16 milliseconds;
+ s16 timezone;
+ u8 daylight;
+ u8 pad2[3];
+};
+
+extern int acpi_read_time(struct acpi_time *acpit);
+extern int acpi_set_time(struct acpi_time *acpit);
+extern int acpi_tad_get_capability(unsigned long *output);
+
#if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)
typedef void (*wmi_notify_handler) (u32 value, void *context);
--
1.6.4.2
--
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