[CRYPTO] cryptd: Fix EINPROGRESS notification context

[linux/fpc-iii.git] / drivers / misc / eeepc-laptop.c

/*
 *  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 <linux/backlight.h>
#include <linux/fb.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.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
#define NOTIFY_BRN_MIN  0x20
#define NOTIFY_BRN_MAX  0x2f

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
};

#define EEEPC_EC        "\\_SB.PCI0.SBRG.EC0."

#define EEEPC_EC_FAN_PWM        EEEPC_EC "SC02" /* Fan PWM duty cycle (%) */
#define EEEPC_EC_SC02           0x63
#define EEEPC_EC_FAN_HRPM       EEEPC_EC "SC05" /* High byte, fan speed (RPM) */
#define EEEPC_EC_FAN_LRPM       EEEPC_EC "SC06" /* Low byte, fan speed (RPM) */
#define EEEPC_EC_FAN_CTRL       EEEPC_EC "SFB3" /* Byte containing SF25  */
#define EEEPC_EC_SFB3           0xD3

/*
 * 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,
        },
};

/* The backlight device /sys/class/backlight */
static struct backlight_device *eeepc_backlight_device;

/* The hwmon device */
static struct device *eeepc_hwmon_device;

/*
 * The backlight class declaration
 */
static int read_brightness(struct backlight_device *bd);
static int update_bl_status(struct backlight_device *bd);
static struct backlight_ops eeepcbl_ops = {
        .get_brightness = read_brightness,
        .update_status = update_bl_status,
};

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;
}

/*
 * Backlight
 */
static int read_brightness(struct backlight_device *bd)
{
        return get_acpi(CM_ASL_PANELBRIGHT);
}

static int set_brightness(struct backlight_device *bd, int value)
{
        value = max(0, min(15, value));
        return set_acpi(CM_ASL_PANELBRIGHT, value);
}

static int update_bl_status(struct backlight_device *bd)
{
        return set_brightness(bd, bd->props.brightness);
}

/*
 * 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 notify_brn(void)
{
        struct backlight_device *bd = eeepc_backlight_device;
        bd->props.brightness = read_brightness(bd);
}

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);
        if (event >= NOTIFY_BRN_MIN && event <= NOTIFY_BRN_MAX)
                notify_brn();
        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;
}

/*
 * Hwmon
 */
static int eeepc_get_fan_pwm(void)
{
        int value = 0;

        read_acpi_int(NULL, EEEPC_EC_FAN_PWM, &value);
        return (value);
}

static void eeepc_set_fan_pwm(int value)
{
        value = SENSORS_LIMIT(value, 0, 100);
        ec_write(EEEPC_EC_SC02, value);
}

static int eeepc_get_fan_rpm(void)
{
        int high = 0;
        int low = 0;

        read_acpi_int(NULL, EEEPC_EC_FAN_HRPM, &high);
        read_acpi_int(NULL, EEEPC_EC_FAN_LRPM, &low);
        return (high << 8 | low);
}

static int eeepc_get_fan_ctrl(void)
{
        int value = 0;

        read_acpi_int(NULL, EEEPC_EC_FAN_CTRL, &value);
        return ((value & 0x02 ? 1 : 0));
}

static void eeepc_set_fan_ctrl(int manual)
{
        int value = 0;

        read_acpi_int(NULL, EEEPC_EC_FAN_CTRL, &value);
        if (manual)
                value |= 0x02;
        else
                value &= ~0x02;
        ec_write(EEEPC_EC_SFB3, value);
}

static ssize_t store_sys_hwmon(void (*set)(int), const char *buf, size_t count)
{
        int rv, value;

        rv = parse_arg(buf, count, &value);
        if (rv > 0)
                set(value);
        return rv;
}

static ssize_t show_sys_hwmon(int (*get)(void), char *buf)
{
        return sprintf(buf, "%d\n", get());
}

#define EEEPC_CREATE_SENSOR_ATTR(_name, _mode, _set, _get)              \
        static ssize_t show_##_name(struct device *dev,                 \
                                    struct device_attribute *attr,      \
                                    char *buf)                          \
        {                                                               \
                return show_sys_hwmon(_set, buf);                       \
        }                                                               \
        static ssize_t store_##_name(struct device *dev,                \
                                     struct device_attribute *attr,     \
                                     const char *buf, size_t count)     \
        {                                                               \
                return store_sys_hwmon(_get, buf, count);               \
        }                                                               \
        static SENSOR_DEVICE_ATTR(_name, _mode, show_##_name, store_##_name, 0);

EEEPC_CREATE_SENSOR_ATTR(fan1_input, S_IRUGO, eeepc_get_fan_rpm, NULL);
EEEPC_CREATE_SENSOR_ATTR(fan1_pwm, S_IRUGO | S_IWUSR,
                         eeepc_get_fan_pwm, eeepc_set_fan_pwm);
EEEPC_CREATE_SENSOR_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
                         eeepc_get_fan_ctrl, eeepc_set_fan_ctrl);

static struct attribute *hwmon_attributes[] = {
        &sensor_dev_attr_fan1_pwm.dev_attr.attr,
        &sensor_dev_attr_fan1_input.dev_attr.attr,
        &sensor_dev_attr_pwm1_enable.dev_attr.attr,
        NULL
};

static struct attribute_group hwmon_attribute_group = {
        .attrs = hwmon_attributes
};

/*
 * exit/init
 */
static void eeepc_backlight_exit(void)
{
        if (eeepc_backlight_device)
                backlight_device_unregister(eeepc_backlight_device);
        eeepc_backlight_device = NULL;
}

static void eeepc_hwmon_exit(void)
{
        struct device *hwmon;

        hwmon = eeepc_hwmon_device;
        if (!hwmon)
                return ;
        hwmon_device_unregister(hwmon);
        sysfs_remove_group(&hwmon->kobj,
                           &hwmon_attribute_group);
        eeepc_hwmon_device = NULL;
}

static void __exit eeepc_laptop_exit(void)
{
        eeepc_backlight_exit();
        eeepc_hwmon_exit();
        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 eeepc_backlight_init(struct device *dev)
{
        struct backlight_device *bd;

        bd = backlight_device_register(EEEPC_HOTK_FILE, dev,
                                       NULL, &eeepcbl_ops);
        if (IS_ERR(bd)) {
                printk(EEEPC_ERR
                       "Could not register eeepc backlight device\n");
                eeepc_backlight_device = NULL;
                return PTR_ERR(bd);
        }
        eeepc_backlight_device = bd;
        bd->props.max_brightness = 15;
        bd->props.brightness = read_brightness(NULL);
        bd->props.power = FB_BLANK_UNBLANK;
        backlight_update_status(bd);
        return 0;
}

static int eeepc_hwmon_init(struct device *dev)
{
        struct device *hwmon;
        int result;

        hwmon = hwmon_device_register(dev);
        if (IS_ERR(hwmon)) {
                printk(EEEPC_ERR
                       "Could not register eeepc hwmon device\n");
                eeepc_hwmon_device = NULL;
                return PTR_ERR(hwmon);
        }
        eeepc_hwmon_device = hwmon;
        result = sysfs_create_group(&hwmon->kobj,
                                    &hwmon_attribute_group);
        if (result)
                eeepc_hwmon_exit();
        return result;
}

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);
        result = eeepc_backlight_init(dev);
        if (result)
                goto fail_backlight;
        result = eeepc_hwmon_init(dev);
        if (result)
                goto fail_hwmon;
        /* 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:
        eeepc_hwmon_exit();
fail_hwmon:
        eeepc_backlight_exit();
fail_backlight:
        return result;
}

module_init(eeepc_laptop_init);
module_exit(eeepc_laptop_exit);