eeepc-laptop: add base driver

This patch is based on Eric Cooper's work to clean the original asus_acpi
given by Asus.  It's a platform driver (/sys/devices/platform/eeepc/)
wich support:
     - hotkeys - wlan on/off - camera on/off - cardr on/off

Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Len Brown <len.brown@intel.com>

3 files changed, 455 insertions, 1 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 297a48f85446..2264127afac7 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -351,6 +351,17 @@ config INTEL_MENLOW
 
           If unsure, say N.
 
+config EEEPC_LAPTOP
+        tristate "Eee PC Hotkey Driver (EXPERIMENTAL)"
+        depends on X86
+        depends on ACPI
+        depends on EXPERIMENTAL
+        ---help---
+          This driver supports the Fn-Fx keys on Eee PC laptops.
+          It also adds the ability to switch camera/wlan on/off.
+
+          If you have an Eee PC laptop, say Y or M here.
+
 config ENCLOSURE_SERVICES
         tristate "Enclosure Services"
         default n
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 5914da434854..1952875a272e 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -7,7 +7,8 @@ obj-$(CONFIG_IBM_ASM)		+= ibmasm/
 obj-$(CONFIG_HDPU_FEATURES)     += hdpuftrs/
 obj-$(CONFIG_MSI_LAPTOP)     += msi-laptop.o
 obj-$(CONFIG_ACER_WMI)     += acer-wmi.o
-obj-$(CONFIG_ASUS_LAPTOP)     += asus-laptop.o
+obj-$(CONFIG_ASUS_LAPTOP)       += asus-laptop.o
+obj-$(CONFIG_EEEPC_LAPTOP)      += eeepc-laptop.o
 obj-$(CONFIG_ATMEL_PWM)         += atmel_pwm.o
 obj-$(CONFIG_ATMEL_SSC)         += atmel-ssc.o
 obj-$(CONFIG_ATMEL_TCLIB)       += atmel_tclib.o
diff --git a/drivers/misc/eeepc-laptop.c b/drivers/misc/eeepc-laptop.c
new file mode 100644
index 000000000000..e34ff97530cd
--- /dev/null
+++ b/drivers/misc/eeepc-laptop.c
@@ -0,0 +1,442 @@
+/*
+ *  eepc-laptop.c - Asus Eee PC extras
+ *
+ *  Based on asus_acpi.c as patched for the Eee PC by Asus:
+ *  ftp://ftp.asus.com/pub/ASUS/EeePC/701/ASUS_ACPI_071126.rar
+ *  Based on eee.c from eeepc-linux
+ *
+ *  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.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/platform_device.h>
+#include <acpi/acpi_drivers.h>
+#include <acpi/acpi_bus.h>
+#include <linux/uaccess.h>
+
+#define EEEPC_LAPTOP_VERSION    "0.1"
+
+#define EEEPC_HOTK_NAME         "Eee PC Hotkey Driver"
+#define EEEPC_HOTK_FILE         "eeepc"
+#define EEEPC_HOTK_CLASS        "hotkey"
+#define EEEPC_HOTK_DEVICE_NAME  "Hotkey"
+#define EEEPC_HOTK_HID          "ASUS010"
+
+#define EEEPC_LOG       EEEPC_HOTK_FILE ": "
+#define EEEPC_ERR       KERN_ERR        EEEPC_LOG
+#define EEEPC_WARNING   KERN_WARNING    EEEPC_LOG
+#define EEEPC_NOTICE    KERN_NOTICE     EEEPC_LOG
+#define EEEPC_INFO      KERN_INFO       EEEPC_LOG
+
+/*
+ * Definitions for Asus EeePC
+ */
+#define NOTIFY_WLAN_ON  0x10
+
+enum {
+        DISABLE_ASL_WLAN = 0x0001,
+        DISABLE_ASL_BLUETOOTH = 0x0002,
+        DISABLE_ASL_IRDA = 0x0004,
+        DISABLE_ASL_CAMERA = 0x0008,
+        DISABLE_ASL_TV = 0x0010,
+        DISABLE_ASL_GPS = 0x0020,
+        DISABLE_ASL_DISPLAYSWITCH = 0x0040,
+        DISABLE_ASL_MODEM = 0x0080,
+        DISABLE_ASL_CARDREADER = 0x0100
+};
+
+enum {
+        CM_ASL_WLAN = 0,
+        CM_ASL_BLUETOOTH,
+        CM_ASL_IRDA,
+        CM_ASL_1394,
+        CM_ASL_CAMERA,
+        CM_ASL_TV,
+        CM_ASL_GPS,
+        CM_ASL_DVDROM,
+        CM_ASL_DISPLAYSWITCH,
+        CM_ASL_PANELBRIGHT,
+        CM_ASL_BIOSFLASH,
+        CM_ASL_ACPIFLASH,
+        CM_ASL_CPUFV,
+        CM_ASL_CPUTEMPERATURE,
+        CM_ASL_FANCPU,
+        CM_ASL_FANCHASSIS,
+        CM_ASL_USBPORT1,
+        CM_ASL_USBPORT2,
+        CM_ASL_USBPORT3,
+        CM_ASL_MODEM,
+        CM_ASL_CARDREADER,
+        CM_ASL_LID
+};
+
+const char *cm_getv[] = {
+        "WLDG", NULL, NULL, NULL,
+        "CAMG", NULL, NULL, NULL,
+        NULL, "PBLG", NULL, NULL,
+        "CFVG", NULL, NULL, NULL,
+        "USBG", NULL, NULL, "MODG",
+        "CRDG", "LIDG"
+};
+
+const char *cm_setv[] = {
+        "WLDS", NULL, NULL, NULL,
+        "CAMS", NULL, NULL, NULL,
+        "SDSP", "PBLS", "HDPS", NULL,
+        "CFVS", NULL, NULL, NULL,
+        "USBG", NULL, NULL, "MODS",
+        "CRDS", NULL
+};
+
+/*
+ * This is the main structure, we can use it to store useful information
+ * about the hotk device
+ */
+struct eeepc_hotk {
+        struct acpi_device *device;     /* the device we are in */
+        acpi_handle handle;             /* the handle of the hotk device */
+        u32 cm_supported;               /* the control methods supported
+                                           by this BIOS */
+        uint init_flag;                 /* Init flags */
+        u16 event_count[128];           /* count for each event */
+};
+
+/* The actual device the driver binds to */
+static struct eeepc_hotk *ehotk;
+
+/* Platform device/driver */
+static struct platform_driver platform_driver = {
+        .driver = {
+                .name = EEEPC_HOTK_FILE,
+                .owner = THIS_MODULE,
+        }
+};
+
+static struct platform_device *platform_device;
+
+/*
+ * The hotkey driver declaration
+ */
+static int eeepc_hotk_add(struct acpi_device *device);
+static int eeepc_hotk_remove(struct acpi_device *device, int type);
+
+static const struct acpi_device_id eeepc_device_ids[] = {
+        {EEEPC_HOTK_HID, 0},
+        {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, eeepc_device_ids);
+
+static struct acpi_driver eeepc_hotk_driver = {
+        .name = EEEPC_HOTK_NAME,
+        .class = EEEPC_HOTK_CLASS,
+        .ids = eeepc_device_ids,
+        .ops = {
+                .add = eeepc_hotk_add,
+                .remove = eeepc_hotk_remove,
+        },
+};
+
+MODULE_AUTHOR("Corentin Chary, Eric Cooper");
+MODULE_DESCRIPTION(EEEPC_HOTK_NAME);
+MODULE_LICENSE("GPL");
+
+/*
+ * ACPI Helpers
+ */
+static int write_acpi_int(acpi_handle handle, const char *method, int val,
+                          struct acpi_buffer *output)
+{
+        struct acpi_object_list params;
+        union acpi_object in_obj;
+        acpi_status status;
+
+        params.count = 1;
+        params.pointer = &in_obj;
+        in_obj.type = ACPI_TYPE_INTEGER;
+        in_obj.integer.value = val;
+
+        status = acpi_evaluate_object(handle, (char *)method, &params, output);
+        return (status == AE_OK ? 0 : -1);
+}
+
+static int read_acpi_int(acpi_handle handle, const char *method, int *val)
+{
+        acpi_status status;
+        ulong result;
+
+        status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
+        if (ACPI_FAILURE(status)) {
+                *val = -1;
+                return -1;
+        } else {
+                *val = result;
+                return 0;
+        }
+}
+
+static int set_acpi(int cm, int value)
+{
+        if (ehotk->cm_supported & (0x1 << cm)) {
+                const char *method = cm_setv[cm];
+                if (method == NULL)
+                        return -ENODEV;
+                if (write_acpi_int(ehotk->handle, method, value, NULL))
+                        printk(EEEPC_WARNING "Error writing %s\n", method);
+        }
+        return 0;
+}
+
+static int get_acpi(int cm)
+{
+        int value = -1;
+        if ((ehotk->cm_supported & (0x1 << cm))) {
+                const char *method = cm_getv[cm];
+                if (method == NULL)
+                        return -ENODEV;
+                if (read_acpi_int(ehotk->handle, method, &value))
+                        printk(EEEPC_WARNING "Error reading %s\n", method);
+        }
+        return value;
+}
+
+/*
+ * Sys helpers
+ */
+static int parse_arg(const char *buf, unsigned long count, int *val)
+{
+        if (!count)
+                return 0;
+        if (sscanf(buf, "%i", val) != 1)
+                return -EINVAL;
+        return count;
+}
+
+static ssize_t store_sys_acpi(int cm, const char *buf, size_t count)
+{
+        int rv, value;
+
+        rv = parse_arg(buf, count, &value);
+        if (rv > 0)
+                set_acpi(cm, value);
+        return rv;
+}
+
+static ssize_t show_sys_acpi(int cm, char *buf)
+{
+        return sprintf(buf, "%d\n", get_acpi(cm));
+}
+
+#define EEEPC_CREATE_DEVICE_ATTR(_name, _cm)                            \
+        static ssize_t show_##_name(struct device *dev,                 \
+                                    struct device_attribute *attr,      \
+                                    char *buf)                          \
+        {                                                               \
+                return show_sys_acpi(_cm, buf);                         \
+        }                                                               \
+        static ssize_t store_##_name(struct device *dev,                \
+                                     struct device_attribute *attr,     \
+                                     const char *buf, size_t count)     \
+        {                                                               \
+                return store_sys_acpi(_cm, buf, count);                 \
+        }                                                               \
+        static struct device_attribute dev_attr_##_name = {             \
+                .attr = {                                               \
+                        .name = __stringify(_name),                     \
+                        .mode = 0644 },                                 \
+                .show   = show_##_name,                                 \
+                .store  = store_##_name,                                \
+        }
+
+EEEPC_CREATE_DEVICE_ATTR(camera, CM_ASL_CAMERA);
+EEEPC_CREATE_DEVICE_ATTR(cardr, CM_ASL_CARDREADER);
+EEEPC_CREATE_DEVICE_ATTR(disp, CM_ASL_DISPLAYSWITCH);
+EEEPC_CREATE_DEVICE_ATTR(wlan, CM_ASL_WLAN);
+
+static struct attribute *platform_attributes[] = {
+        &dev_attr_camera.attr,
+        &dev_attr_cardr.attr,
+        &dev_attr_disp.attr,
+        &dev_attr_wlan.attr,
+        NULL
+};
+
+static struct attribute_group platform_attribute_group = {
+        .attrs = platform_attributes
+};
+
+/*
+ * Hotkey functions
+ */
+static int eeepc_hotk_check(void)
+{
+        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+        int result;
+
+        result = acpi_bus_get_status(ehotk->device);
+        if (result)
+                return result;
+        if (ehotk->device->status.present) {
+                if (write_acpi_int(ehotk->handle, "INIT", ehotk->init_flag,
+                                    &buffer)) {
+                        printk(EEEPC_ERR "Hotkey initialization failed\n");
+                        return -ENODEV;
+                } else {
+                        printk(EEEPC_NOTICE "Hotkey init flags 0x%x\n",
+                               ehotk->init_flag);
+                }
+                /* get control methods supported */
+                if (read_acpi_int(ehotk->handle, "CMSG"
+                                   , &ehotk->cm_supported)) {
+                        printk(EEEPC_ERR
+                               "Get control methods supported failed\n");
+                        return -ENODEV;
+                } else {
+                        printk(EEEPC_INFO
+                               "Get control methods supported: 0x%x\n",
+                               ehotk->cm_supported);
+                }
+        } else {
+                printk(EEEPC_ERR "Hotkey device not present, aborting\n");
+                return -EINVAL;
+        }
+        return 0;
+}
+
+static void notify_wlan(u32 *event)
+{
+        /* if DISABLE_ASL_WLAN is set, the notify code for fn+f2
+           will always be 0x10 */
+        if (ehotk->cm_supported & (0x1 << CM_ASL_WLAN)) {
+                const char *method = cm_getv[CM_ASL_WLAN];
+                int value;
+                if (read_acpi_int(ehotk->handle, method, &value))
+                        printk(EEEPC_WARNING "Error reading %s\n",
+                               method);
+                else if (value == 1)
+                        *event = 0x11;
+        }
+}
+
+static void eeepc_hotk_notify(acpi_handle handle, u32 event, void *data)
+{
+        if (!ehotk)
+                return;
+        if (event == NOTIFY_WLAN_ON && (DISABLE_ASL_WLAN & ehotk->init_flag))
+                notify_wlan(&event);
+        acpi_bus_generate_proc_event(ehotk->device, event,
+                                     ehotk->event_count[event % 128]++);
+}
+
+static int eeepc_hotk_add(struct acpi_device *device)
+{
+        acpi_status status = AE_OK;
+        int result;
+
+        if (!device)
+                 return -EINVAL;
+        printk(EEEPC_NOTICE EEEPC_HOTK_NAME "\n");
+        ehotk = kzalloc(sizeof(struct eeepc_hotk), GFP_KERNEL);
+        if (!ehotk)
+                return -ENOMEM;
+        ehotk->init_flag = DISABLE_ASL_WLAN | DISABLE_ASL_DISPLAYSWITCH;
+        ehotk->handle = device->handle;
+        strcpy(acpi_device_name(device), EEEPC_HOTK_DEVICE_NAME);
+        strcpy(acpi_device_class(device), EEEPC_HOTK_CLASS);
+        acpi_driver_data(device) = ehotk;
+        ehotk->device = device;
+        result = eeepc_hotk_check();
+        if (result)
+                goto end;
+        status = acpi_install_notify_handler(ehotk->handle, ACPI_SYSTEM_NOTIFY,
+                                             eeepc_hotk_notify, ehotk);
+        if (ACPI_FAILURE(status))
+                printk(EEEPC_ERR "Error installing notify handler\n");
+ end:
+        if (result) {
+                kfree(ehotk);
+                ehotk = NULL;
+        }
+        return result;
+}
+
+static int eeepc_hotk_remove(struct acpi_device *device, int type)
+{
+        acpi_status status = 0;
+
+        if (!device || !acpi_driver_data(device))
+                 return -EINVAL;
+        status = acpi_remove_notify_handler(ehotk->handle, ACPI_SYSTEM_NOTIFY,
+                                            eeepc_hotk_notify);
+        if (ACPI_FAILURE(status))
+                printk(EEEPC_ERR "Error removing notify handler\n");
+        kfree(ehotk);
+        return 0;
+}
+
+/*
+ * exit/init
+ */
+static void __exit eeepc_laptop_exit(void)
+{
+        acpi_bus_unregister_driver(&eeepc_hotk_driver);
+        sysfs_remove_group(&platform_device->dev.kobj,
+                           &platform_attribute_group);
+        platform_device_unregister(platform_device);
+        platform_driver_unregister(&platform_driver);
+}
+
+static int __init eeepc_laptop_init(void)
+{
+        struct device *dev;
+        int result;
+
+        if (acpi_disabled)
+                return -ENODEV;
+        result = acpi_bus_register_driver(&eeepc_hotk_driver);
+        if (result < 0)
+                return result;
+        if (!ehotk) {
+                acpi_bus_unregister_driver(&eeepc_hotk_driver);
+                return -ENODEV;
+        }
+        dev = acpi_get_physical_device(ehotk->device->handle);
+        /* Register platform stuff */
+        result = platform_driver_register(&platform_driver);
+        if (result)
+                goto fail_platform_driver;
+        platform_device = platform_device_alloc(EEEPC_HOTK_FILE, -1);
+        if (!platform_device) {
+                result = -ENOMEM;
+                goto fail_platform_device1;
+        }
+        result = platform_device_add(platform_device);
+        if (result)
+                goto fail_platform_device2;
+        result = sysfs_create_group(&platform_device->dev.kobj,
+                                    &platform_attribute_group);
+        if (result)
+                goto fail_sysfs;
+        return 0;
+fail_sysfs:
+        platform_device_del(platform_device);
+fail_platform_device2:
+        platform_device_put(platform_device);
+fail_platform_device1:
+        platform_driver_unregister(&platform_driver);
+fail_platform_driver:
+        return result;
+}
+
+module_init(eeepc_laptop_init);
+module_exit(eeepc_laptop_exit);