ACPI: Provide /sys/kernel/debug/ec/...

This patch provides the same information through debugfs, which previously was
provided through /proc/acpi/embedded_controller/*/info

This is the gpe the EC is connected to and whether the global lock
gets used.
The io ports used are added to /proc/ioports in another patch.
Beside the fact that /proc/acpi is deprecated for quite some time,
this info is not needed for applications and thus can be moved
to debugfs instead of a public interface like /sys.

Signed-off-by: Thomas Renninger <trenn@suse.de>

CC: Alexey Starikovskiy <astarikovskiy@suse.de>
CC: Len Brown <lenb@kernel.org>
CC: linux-kernel@vger.kernel.org
CC: linux-acpi@vger.kernel.org
CC: Bjorn Helgaas <bjorn.helgaas@hp.com>
CC: platform-driver-x86@vger.kernel.org
Signed-off-by: Matthew Garrett <mjg@redhat.com>

5 files changed, 100 insertions, 13 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 746411518802..f7226d1bc80e 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -104,6 +104,19 @@ config ACPI_SYSFS_POWER
         help
           Say N to disable power /sys interface
 
+config ACPI_EC_DEBUGFS
+        tristate "EC read/write access through /sys/kernel/debug/ec"
+        default y
+        help
+          Say N to disable Embedded Controller /sys/kernel/debug interface
+
+          An Embedded Controller typically is available on laptops and reads
+          sensor values like battery state and temperature.
+          The kernel access the EC through ACPI parsed code provided by BIOS
+          tables.
+          Thus this option is a debug option that helps to write ACPI drivers
+          and can be used to identify ACPI code or EC firmware bugs.
+
 config ACPI_PROC_EVENT
         bool "Deprecated /proc/acpi/event support"
         depends on PROC_FS
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 6ee33169e1dc..833b582d1762 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -60,6 +60,7 @@ obj-$(CONFIG_ACPI_SBS)		+= sbshc.o
 obj-$(CONFIG_ACPI_SBS)          += sbs.o
 obj-$(CONFIG_ACPI_POWER_METER)  += power_meter.o
 obj-$(CONFIG_ACPI_HED)          += hed.o
+obj-$(CONFIG_ACPI_EC_DEBUGFS)   += ec_sys.o
 
 # processor has its own "processor." module_param namespace
 processor-y                     := processor_driver.o processor_throttling.o
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index ce1f07fd7241..a79e1b193e85 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -43,10 +43,13 @@
 #include <acpi/acpi_drivers.h>
 #include <linux/dmi.h>
 
+#include "internal.h"
+
 #define ACPI_EC_CLASS                   "embedded_controller"
 #define ACPI_EC_DEVICE_NAME             "Embedded Controller"
 #define ACPI_EC_FILE_INFO               "info"
 
+#undef PREFIX
 #define PREFIX                          "ACPI: EC: "
 
 /* EC status register */
@@ -104,19 +107,8 @@ struct transaction {
         bool done;
 };
 
-static struct acpi_ec {
-        acpi_handle handle;
-        unsigned long gpe;
-        unsigned long command_addr;
-        unsigned long data_addr;
-        unsigned long global_lock;
-        unsigned long flags;
-        struct mutex lock;
-        wait_queue_head_t wait;
-        struct list_head list;
-        struct transaction *curr;
-        spinlock_t curr_lock;
-} *boot_ec, *first_ec;
+struct acpi_ec *boot_ec, *first_ec;
+EXPORT_SYMBOL(first_ec);
 
 static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */
 static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */
diff --git a/drivers/acpi/ec_sys.c b/drivers/acpi/ec_sys.c
new file mode 100644
index 000000000000..834c21a42d67
--- /dev/null
+++ b/drivers/acpi/ec_sys.c
@@ -0,0 +1,57 @@
+#include <linux/kernel.h>
+#include <linux/acpi.h>
+#include <linux/debugfs.h>
+#include "internal.h"
+
+MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
+MODULE_DESCRIPTION("ACPI EC sysfs access driver");
+MODULE_LICENSE("GPL");
+
+struct sysdev_class acpi_ec_sysdev_class = {
+        .name = "ec",
+};
+
+static struct dentry *acpi_ec_debugfs_dir;
+
+int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
+{
+        struct dentry *dev_dir;
+        char name[64];
+        if (ec_device_count == 0) {
+                acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL);
+                if (!acpi_ec_debugfs_dir)
+                        return -ENOMEM;
+        }
+
+        sprintf(name, "ec%u", ec_device_count);
+        dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir);
+        if (!dev_dir) {
+                if (ec_device_count == 0)
+                        debugfs_remove_recursive(acpi_ec_debugfs_dir);
+                /* TBD: Proper cleanup for multiple ECs */
+                return -ENOMEM;
+        }
+
+        debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe);
+        debugfs_create_bool("use_global_lock", 0444, dev_dir,
+                            (u32 *)&first_ec->global_lock);
+        return 0;
+}
+
+static int __init acpi_ec_sys_init(void)
+{
+        int err = 0;
+        if (first_ec)
+                err = acpi_ec_add_debugfs(first_ec, 0);
+        else
+                err = -ENODEV;
+        return err;
+}
+
+static void __exit acpi_ec_sys_exit(void)
+{
+        debugfs_remove_recursive(acpi_ec_debugfs_dir);
+}
+
+module_init(acpi_ec_sys_init);
+module_exit(acpi_ec_sys_exit);
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index f8f190ec066e..8ae27264a00e 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -18,6 +18,11 @@
  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#ifndef _ACPI_INTERNAL_H_
+#define _ACPI_INTERNAL_H_
+
+#include <linux/sysdev.h>
+
 #define PREFIX "ACPI: "
 
 int init_acpi_device_notify(void);
@@ -46,6 +51,23 @@ void acpi_early_processor_set_pdc(void);
 /* --------------------------------------------------------------------------
                                   Embedded Controller
    -------------------------------------------------------------------------- */
+struct acpi_ec {
+        acpi_handle handle;
+        unsigned long gpe;
+        unsigned long command_addr;
+        unsigned long data_addr;
+        unsigned long global_lock;
+        unsigned long flags;
+        struct mutex lock;
+        wait_queue_head_t wait;
+        struct list_head list;
+        struct transaction *curr;
+        spinlock_t curr_lock;
+        struct sys_device sysdev;
+};
+
+extern struct acpi_ec *first_ec;
+
 int acpi_ec_init(void);
 int acpi_ec_ecdt_probe(void);
 int acpi_boot_ec_enable(void);
@@ -63,3 +85,5 @@ int acpi_sleep_proc_init(void);
 #else
 static inline int acpi_sleep_proc_init(void) { return 0; }
 #endif
+
+#endif /* _ACPI_INTERNAL_H_ */