// SPDX-License-Identifier: GPL-2.0-only
/*
 * ati_remote2 - ATI/Philips USB RF remote driver
 *
 * Copyright (C) 2005-2008 Ville Syrjala <syrjala@sci.fi>
 * Copyright (C) 2007-2008 Peter Stokes <linux@dadeos.co.uk>
 */

#include <linux/usb/input.h>
#include <linux/slab.h>
#include <linux/module.h>

#define DRIVER_DESC    "ATI/Philips USB RF remote driver"

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Ville Syrjala <syrjala@sci.fi>");
MODULE_LICENSE("GPL");

/*
 * ATI Remote Wonder II Channel Configuration
 *
 * The remote control can be assigned one of sixteen "channels" in order to facilitate
 * the use of multiple remote controls within range of each other.
 * A remote's "channel" may be altered by pressing and holding the "PC" button for
 * approximately 3 seconds, after which the button will slowly flash the count of the
 * currently configured "channel", using the numeric keypad enter a number between 1 and
 * 16 and then press the "PC" button again, the button will slowly flash the count of the
 * newly configured "channel".
 */

enum {
        ATI_REMOTE2_MAX_CHANNEL_MASK = 0xFFFF,
        ATI_REMOTE2_MAX_MODE_MASK = 0x1F,
};

static int ati_remote2_set_mask(const char *val,
                                const struct kernel_param *kp,
                                unsigned int max)
{
        unsigned int mask;
        int ret;

        if (!val)
                return -EINVAL;

        ret = kstrtouint(val, 0, &mask);
        if (ret)
                return ret;

        if (mask & ~max)
                return -EINVAL;

        *(unsigned int *)kp->arg = mask;

        return 0;
}

static int ati_remote2_set_channel_mask(const char *val,
                                        const struct kernel_param *kp)
{
        pr_debug("%s()\n", __func__);

        return ati_remote2_set_mask(val, kp, ATI_REMOTE2_MAX_CHANNEL_MASK);
}

static int ati_remote2_get_channel_mask(char *buffer,
                                        const struct kernel_param *kp)
{
        pr_debug("%s()\n", __func__);

        return sprintf(buffer, "0x%04x\n", *(unsigned int *)kp->arg);
}

static int ati_remote2_set_mode_mask(const char *val,
                                     const struct kernel_param *kp)
{
        pr_debug("%s()\n", __func__);

        return ati_remote2_set_mask(val, kp, ATI_REMOTE2_MAX_MODE_MASK);
}

static int ati_remote2_get_mode_mask(char *buffer,
                                     const struct kernel_param *kp)
{
        pr_debug("%s()\n", __func__);

        return sprintf(buffer, "0x%02x\n", *(unsigned int *)kp->arg);
}

static unsigned int channel_mask = ATI_REMOTE2_MAX_CHANNEL_MASK;
#define param_check_channel_mask(name, p) __param_check(name, p, unsigned int)
static const struct kernel_param_ops param_ops_channel_mask = {
        .set = ati_remote2_set_channel_mask,
        .get = ati_remote2_get_channel_mask,
};
module_param(channel_mask, channel_mask, 0644);
MODULE_PARM_DESC(channel_mask, "Bitmask of channels to accept <15:Channel16>...<1:Channel2><0:Channel1>");

static unsigned int mode_mask = ATI_REMOTE2_MAX_MODE_MASK;
#define param_check_mode_mask(name, p) __param_check(name, p, unsigned int)
static const struct kernel_param_ops param_ops_mode_mask = {
        .set = ati_remote2_set_mode_mask,
        .get = ati_remote2_get_mode_mask,
};
module_param(mode_mask, mode_mask, 0644);
MODULE_PARM_DESC(mode_mask, "Bitmask of modes to accept <4:PC><3:AUX4><2:AUX3><1:AUX2><0:AUX1>");

static const struct usb_device_id ati_remote2_id_table[] = {
        { USB_DEVICE(0x0471, 0x0602) }, /* ATI Remote Wonder II */
        { }
};
MODULE_DEVICE_TABLE(usb, ati_remote2_id_table);

static DEFINE_MUTEX(ati_remote2_mutex);

enum {
        ATI_REMOTE2_OPENED = 0x1,
        ATI_REMOTE2_SUSPENDED = 0x2,
};

enum {
        ATI_REMOTE2_AUX1,
        ATI_REMOTE2_AUX2,
        ATI_REMOTE2_AUX3,
        ATI_REMOTE2_AUX4,
        ATI_REMOTE2_PC,
        ATI_REMOTE2_MODES,
};

static const struct {
        u8  hw_code;
        u16 keycode;
} ati_remote2_key_table[] = {
        { 0x00, KEY_0 },
        { 0x01, KEY_1 },
        { 0x02, KEY_2 },
        { 0x03, KEY_3 },
        { 0x04, KEY_4 },
        { 0x05, KEY_5 },
        { 0x06, KEY_6 },
        { 0x07, KEY_7 },
        { 0x08, KEY_8 },
        { 0x09, KEY_9 },
        { 0x0c, KEY_POWER },
        { 0x0d, KEY_MUTE },
        { 0x10, KEY_VOLUMEUP },
        { 0x11, KEY_VOLUMEDOWN },
        { 0x20, KEY_CHANNELUP },
        { 0x21, KEY_CHANNELDOWN },
        { 0x28, KEY_FORWARD },
        { 0x29, KEY_REWIND },
        { 0x2c, KEY_PLAY },
        { 0x30, KEY_PAUSE },
        { 0x31, KEY_STOP },
        { 0x37, KEY_RECORD },
        { 0x38, KEY_DVD },
        { 0x39, KEY_TV },
        { 0x3f, KEY_PROG1 }, /* AUX1-AUX4 and PC */
        { 0x54, KEY_MENU },
        { 0x58, KEY_UP },
        { 0x59, KEY_DOWN },
        { 0x5a, KEY_LEFT },
        { 0x5b, KEY_RIGHT },
        { 0x5c, KEY_OK },
        { 0x78, KEY_A },
        { 0x79, KEY_B },
        { 0x7a, KEY_C },
        { 0x7b, KEY_D },
        { 0x7c, KEY_E },
        { 0x7d, KEY_F },
        { 0x82, KEY_ENTER },
        { 0x8e, KEY_VENDOR },
        { 0x96, KEY_COFFEE },
        { 0xa9, BTN_LEFT },
        { 0xaa, BTN_RIGHT },
        { 0xbe, KEY_QUESTION },
        { 0xd0, KEY_EDIT },
        { 0xd5, KEY_FRONT },
        { 0xf9, KEY_INFO },
};

struct ati_remote2 {
        struct input_dev *idev;
        struct usb_device *udev;

        struct usb_interface *intf[2];
        struct usb_endpoint_descriptor *ep[2];
        struct urb *urb[2];
        void *buf[2];
        dma_addr_t buf_dma[2];

        unsigned long jiffies;
        int mode;

        char name[64];
        char phys[64];

        /* Each mode (AUX1-AUX4 and PC) can have an independent keymap. */
        u16 keycode[ATI_REMOTE2_MODES][ARRAY_SIZE(ati_remote2_key_table)];

        unsigned int flags;

        unsigned int channel_mask;
        unsigned int mode_mask;
};

static struct usb_driver ati_remote2_driver;

static int ati_remote2_submit_urbs(struct ati_remote2 *ar2)
{
        int r;

        r = usb_submit_urb(ar2->urb[0], GFP_KERNEL);
        if (r) {
                dev_err(&ar2->intf[0]->dev,
                        "%s(): usb_submit_urb() = %d\n", __func__, r);
                return r;
        }
        r = usb_submit_urb(ar2->urb[1], GFP_KERNEL);
        if (r) {
                usb_kill_urb(ar2->urb[0]);
                dev_err(&ar2->intf[1]->dev,
                        "%s(): usb_submit_urb() = %d\n", __func__, r);
                return r;
        }

        return 0;
}

static void ati_remote2_kill_urbs(struct ati_remote2 *ar2)
{
        usb_kill_urb(ar2->urb[1]);
        usb_kill_urb(ar2->urb[0]);
}

static int ati_remote2_open(struct input_dev *idev)
{
        struct ati_remote2 *ar2 = input_get_drvdata(idev);
        int r;

        dev_dbg(&ar2->intf[0]->dev, "%s()\n", __func__);

        r = usb_autopm_get_interface(ar2->intf[0]);
        if (r) {
                dev_err(&ar2->intf[0]->dev,
                        "%s(): usb_autopm_get_interface() = %d\n", __func__, r);
                return r;
        }

        scoped_guard(mutex, &ati_remote2_mutex) {
                if (!(ar2->flags & ATI_REMOTE2_SUSPENDED)) {
                        r = ati_remote2_submit_urbs(ar2);
                        if (r)
                                break;
                }

                ar2->flags |= ATI_REMOTE2_OPENED;
        }

        usb_autopm_put_interface(ar2->intf[0]);

        return r;
}

static void ati_remote2_close(struct input_dev *idev)
{
        struct ati_remote2 *ar2 = input_get_drvdata(idev);

        dev_dbg(&ar2->intf[0]->dev, "%s()\n", __func__);

        guard(mutex)(&ati_remote2_mutex);

        if (!(ar2->flags & ATI_REMOTE2_SUSPENDED))
                ati_remote2_kill_urbs(ar2);

        ar2->flags &= ~ATI_REMOTE2_OPENED;
}

static void ati_remote2_input_mouse(struct ati_remote2 *ar2)
{
        struct input_dev *idev = ar2->idev;
        u8 *data = ar2->buf[0];
        int channel, mode;

        channel = data[0] >> 4;

        if (!((1 << channel) & ar2->channel_mask))
                return;

        mode = data[0] & 0x0F;

        if (mode > ATI_REMOTE2_PC) {
                dev_err(&ar2->intf[0]->dev,
                        "Unknown mode byte (%02x %02x %02x %02x)\n",
                        data[3], data[2], data[1], data[0]);
                return;
        }

        if (!((1 << mode) & ar2->mode_mask))
                return;

        input_event(idev, EV_REL, REL_X, (s8) data[1]);
        input_event(idev, EV_REL, REL_Y, (s8) data[2]);
        input_sync(idev);
}

static int ati_remote2_lookup(unsigned int hw_code)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(ati_remote2_key_table); i++)
                if (ati_remote2_key_table[i].hw_code == hw_code)
                        return i;

        return -1;
}

static void ati_remote2_input_key(struct ati_remote2 *ar2)
{
        struct input_dev *idev = ar2->idev;
        u8 *data = ar2->buf[1];
        int channel, mode, hw_code, index;

        channel = data[0] >> 4;

        if (!((1 << channel) & ar2->channel_mask))
                return;

        mode = data[0] & 0x0F;

        if (mode > ATI_REMOTE2_PC) {
                dev_err(&ar2->intf[1]->dev,
                        "Unknown mode byte (%02x %02x %02x %02x)\n",
                        data[3], data[2], data[1], data[0]);
                return;
        }

        hw_code = data[2];
        if (hw_code == 0x3f) {
                /*
                 * For some incomprehensible reason the mouse pad generates
                 * events which look identical to the events from the last
                 * pressed mode key. Naturally we don't want to generate key
                 * events for the mouse pad so we filter out any subsequent
                 * events from the same mode key.
                 */
                if (ar2->mode == mode)
                        return;

                if (data[1] == 0)
                        ar2->mode = mode;
        }

        if (!((1 << mode) & ar2->mode_mask))
                return;

        index = ati_remote2_lookup(hw_code);
        if (index < 0) {
                dev_err(&ar2->intf[1]->dev,
                        "Unknown code byte (%02x %02x %02x %02x)\n",
                        data[3], data[2], data[1], data[0]);
                return;
        }

        switch (data[1]) {
        case 0: /* release */
                break;
        case 1: /* press */
                ar2->jiffies = jiffies + msecs_to_jiffies(idev->rep[REP_DELAY]);
                break;
        case 2: /* repeat */

                /* No repeat for mouse buttons. */
                if (ar2->keycode[mode][index] == BTN_LEFT ||
                    ar2->keycode[mode][index] == BTN_RIGHT)
                        return;

                if (!time_after_eq(jiffies, ar2->jiffies))
                        return;

                ar2->jiffies = jiffies + msecs_to_jiffies(idev->rep[REP_PERIOD]);
                break;
        default:
                dev_err(&ar2->intf[1]->dev,
                        "Unknown state byte (%02x %02x %02x %02x)\n",
                        data[3], data[2], data[1], data[0]);
                return;
        }

        input_event(idev, EV_KEY, ar2->keycode[mode][index], data[1]);
        input_sync(idev);
}

static void ati_remote2_complete_mouse(struct urb *urb)
{
        struct ati_remote2 *ar2 = urb->context;
        int r;

        switch (urb->status) {
        case 0:
                usb_mark_last_busy(ar2->udev);
                ati_remote2_input_mouse(ar2);
                break;
        case -ENOENT:
        case -EILSEQ:
        case -ECONNRESET:
        case -ESHUTDOWN:
                dev_dbg(&ar2->intf[0]->dev,
                        "%s(): urb status = %d\n", __func__, urb->status);
                return;
        default:
                usb_mark_last_busy(ar2->udev);
                dev_err(&ar2->intf[0]->dev,
                        "%s(): urb status = %d\n", __func__, urb->status);
        }

        r = usb_submit_urb(urb, GFP_ATOMIC);
        if (r)
                dev_err(&ar2->intf[0]->dev,
                        "%s(): usb_submit_urb() = %d\n", __func__, r);
}

static void ati_remote2_complete_key(struct urb *urb)
{
        struct ati_remote2 *ar2 = urb->context;
        int r;

        switch (urb->status) {
        case 0:
                usb_mark_last_busy(ar2->udev);
                ati_remote2_input_key(ar2);
                break;
        case -ENOENT:
        case -EILSEQ:
        case -ECONNRESET:
        case -ESHUTDOWN:
                dev_dbg(&ar2->intf[1]->dev,
                        "%s(): urb status = %d\n", __func__, urb->status);
                return;
        default:
                usb_mark_last_busy(ar2->udev);
                dev_err(&ar2->intf[1]->dev,
                        "%s(): urb status = %d\n", __func__, urb->status);
        }

        r = usb_submit_urb(urb, GFP_ATOMIC);
        if (r)
                dev_err(&ar2->intf[1]->dev,
                        "%s(): usb_submit_urb() = %d\n", __func__, r);
}

static int ati_remote2_getkeycode(struct input_dev *idev,
                                  struct input_keymap_entry *ke)
{
        struct ati_remote2 *ar2 = input_get_drvdata(idev);
        unsigned int mode;
        int offset;
        unsigned int index;
        unsigned int scancode;

        if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
                index = ke->index;
                if (index >= ATI_REMOTE2_MODES *
                                ARRAY_SIZE(ati_remote2_key_table))
                        return -EINVAL;

                mode = ke->index / ARRAY_SIZE(ati_remote2_key_table);
                offset = ke->index % ARRAY_SIZE(ati_remote2_key_table);
                scancode = (mode << 8) + ati_remote2_key_table[offset].hw_code;
        } else {
                if (input_scancode_to_scalar(ke, &scancode))
                        return -EINVAL;

                mode = scancode >> 8;
                if (mode > ATI_REMOTE2_PC)
                        return -EINVAL;

                offset = ati_remote2_lookup(scancode & 0xff);
                if (offset < 0)
                        return -EINVAL;

                index = mode * ARRAY_SIZE(ati_remote2_key_table) + offset;
        }

        ke->keycode = ar2->keycode[mode][offset];
        ke->len = sizeof(scancode);
        memcpy(&ke->scancode, &scancode, sizeof(scancode));
        ke->index = index;

        return 0;
}

static int ati_remote2_setkeycode(struct input_dev *idev,
                                  const struct input_keymap_entry *ke,
                                  unsigned int *old_keycode)
{
        struct ati_remote2 *ar2 = input_get_drvdata(idev);
        unsigned int mode;
        int offset;
        unsigned int index;
        unsigned int scancode;

        if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
                if (ke->index >= ATI_REMOTE2_MODES *
                                ARRAY_SIZE(ati_remote2_key_table))
                        return -EINVAL;

                mode = ke->index / ARRAY_SIZE(ati_remote2_key_table);
                offset = ke->index % ARRAY_SIZE(ati_remote2_key_table);
        } else {
                if (input_scancode_to_scalar(ke, &scancode))
                        return -EINVAL;

                mode = scancode >> 8;
                if (mode > ATI_REMOTE2_PC)
                        return -EINVAL;

                offset = ati_remote2_lookup(scancode & 0xff);
                if (offset < 0)
                        return -EINVAL;
        }

        *old_keycode = ar2->keycode[mode][offset];
        ar2->keycode[mode][offset] = ke->keycode;
        __set_bit(ke->keycode, idev->keybit);

        for (mode = 0; mode < ATI_REMOTE2_MODES; mode++) {
                for (index = 0; index < ARRAY_SIZE(ati_remote2_key_table); index++) {
                        if (ar2->keycode[mode][index] == *old_keycode)
                                return 0;
                }
        }

        __clear_bit(*old_keycode, idev->keybit);

        return 0;
}

static int ati_remote2_input_init(struct ati_remote2 *ar2)
{
        struct input_dev *idev;
        int index, mode, retval;

        idev = input_allocate_device();
        if (!idev)
                return -ENOMEM;

        ar2->idev = idev;
        input_set_drvdata(idev, ar2);

        idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) | BIT_MASK(EV_REL);
        idev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
                BIT_MASK(BTN_RIGHT);
        idev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);

        for (mode = 0; mode < ATI_REMOTE2_MODES; mode++) {
                for (index = 0; index < ARRAY_SIZE(ati_remote2_key_table); index++) {
                        ar2->keycode[mode][index] = ati_remote2_key_table[index].keycode;
                        __set_bit(ar2->keycode[mode][index], idev->keybit);
                }
        }

        /* AUX1-AUX4 and PC generate the same scancode. */
        index = ati_remote2_lookup(0x3f);
        ar2->keycode[ATI_REMOTE2_AUX1][index] = KEY_PROG1;
        ar2->keycode[ATI_REMOTE2_AUX2][index] = KEY_PROG2;
        ar2->keycode[ATI_REMOTE2_AUX3][index] = KEY_PROG3;
        ar2->keycode[ATI_REMOTE2_AUX4][index] = KEY_PROG4;
        ar2->keycode[ATI_REMOTE2_PC][index] = KEY_PC;
        __set_bit(KEY_PROG1, idev->keybit);
        __set_bit(KEY_PROG2, idev->keybit);
        __set_bit(KEY_PROG3, idev->keybit);
        __set_bit(KEY_PROG4, idev->keybit);
        __set_bit(KEY_PC, idev->keybit);

        idev->rep[REP_DELAY]  = 250;
        idev->rep[REP_PERIOD] = 33;

        idev->open = ati_remote2_open;
        idev->close = ati_remote2_close;

        idev->getkeycode = ati_remote2_getkeycode;
        idev->setkeycode = ati_remote2_setkeycode;

        idev->name = ar2->name;
        idev->phys = ar2->phys;

        usb_to_input_id(ar2->udev, &idev->id);
        idev->dev.parent = &ar2->udev->dev;

        retval = input_register_device(idev);
        if (retval)
                input_free_device(idev);

        return retval;
}

static int ati_remote2_urb_init(struct ati_remote2 *ar2)
{
        struct usb_device *udev = ar2->udev;
        int i, pipe, maxp;

        for (i = 0; i < 2; i++) {
                ar2->buf[i] = usb_alloc_coherent(udev, 4, GFP_KERNEL, &ar2->buf_dma[i]);
                if (!ar2->buf[i])
                        return -ENOMEM;

                ar2->urb[i] = usb_alloc_urb(0, GFP_KERNEL);
                if (!ar2->urb[i])
                        return -ENOMEM;

                pipe = usb_rcvintpipe(udev, ar2->ep[i]->bEndpointAddress);
                maxp = usb_maxpacket(udev, pipe);
                maxp = maxp > 4 ? 4 : maxp;

                usb_fill_int_urb(ar2->urb[i], udev, pipe, ar2->buf[i], maxp,
                                 i ? ati_remote2_complete_key : ati_remote2_complete_mouse,
                                 ar2, ar2->ep[i]->bInterval);
                ar2->urb[i]->transfer_dma = ar2->buf_dma[i];
                ar2->urb[i]->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
        }

        return 0;
}

static void ati_remote2_urb_cleanup(struct ati_remote2 *ar2)
{
        int i;

        for (i = 0; i < 2; i++) {
                usb_free_urb(ar2->urb[i]);
                usb_free_coherent(ar2->udev, 4, ar2->buf[i], ar2->buf_dma[i]);
        }
}

static int ati_remote2_setup(struct ati_remote2 *ar2, unsigned int ch_mask)
{
        int r, i, channel;

        /*
         * Configure receiver to only accept input from remote "channel"
         *  channel == 0  -> Accept input from any remote channel
         *  channel == 1  -> Only accept input from remote channel 1
         *  channel == 2  -> Only accept input from remote channel 2
         *  ...
         *  channel == 16 -> Only accept input from remote channel 16
         */

        channel = 0;
        for (i = 0; i < 16; i++) {
                if ((1 << i) & ch_mask) {
                        if (!(~(1 << i) & ch_mask))
                                channel = i + 1;
                        break;
                }
        }

        r = usb_control_msg(ar2->udev, usb_sndctrlpipe(ar2->udev, 0),
                            0x20,
                            USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
                            channel, 0x0, NULL, 0, USB_CTRL_SET_TIMEOUT);
        if (r) {
                dev_err(&ar2->udev->dev, "%s - failed to set channel due to error: %d\n",
                        __func__, r);
                return r;
        }

        return 0;
}

static ssize_t ati_remote2_show_channel_mask(struct device *dev,
                                             struct device_attribute *attr,
                                             char *buf)
{
        struct usb_device *udev = to_usb_device(dev);
        struct usb_interface *intf = usb_ifnum_to_if(udev, 0);
        struct ati_remote2 *ar2 = usb_get_intfdata(intf);

        return sprintf(buf, "0x%04x\n", ar2->channel_mask);
}

static ssize_t ati_remote2_store_channel_mask(struct device *dev,
                                              struct device_attribute *attr,
                                              const char *buf, size_t count)
{
        struct usb_device *udev = to_usb_device(dev);
        struct usb_interface *intf = usb_ifnum_to_if(udev, 0);
        struct ati_remote2 *ar2 = usb_get_intfdata(intf);
        unsigned int mask;
        int r;

        r = kstrtouint(buf, 0, &mask);
        if (r)
                return r;

        if (mask & ~ATI_REMOTE2_MAX_CHANNEL_MASK)
                return -EINVAL;

        r = usb_autopm_get_interface(ar2->intf[0]);
        if (r) {
                dev_err(&ar2->intf[0]->dev,
                        "%s(): usb_autopm_get_interface() = %d\n", __func__, r);
                return r;
        }

        scoped_guard(mutex, &ati_remote2_mutex) {
                if (mask != ar2->channel_mask) {
                        r = ati_remote2_setup(ar2, mask);
                        if (!r)
                                ar2->channel_mask = mask;
                }
        }

        usb_autopm_put_interface(ar2->intf[0]);

        return r ? r : count;
}

static ssize_t ati_remote2_show_mode_mask(struct device *dev,
                                          struct device_attribute *attr,
                                          char *buf)
{
        struct usb_device *udev = to_usb_device(dev);
        struct usb_interface *intf = usb_ifnum_to_if(udev, 0);
        struct ati_remote2 *ar2 = usb_get_intfdata(intf);

        return sprintf(buf, "0x%02x\n", ar2->mode_mask);
}

static ssize_t ati_remote2_store_mode_mask(struct device *dev,
                                           struct device_attribute *attr,
                                           const char *buf, size_t count)
{
        struct usb_device *udev = to_usb_device(dev);
        struct usb_interface *intf = usb_ifnum_to_if(udev, 0);
        struct ati_remote2 *ar2 = usb_get_intfdata(intf);
        unsigned int mask;
        int err;

        err = kstrtouint(buf, 0, &mask);
        if (err)
                return err;

        if (mask & ~ATI_REMOTE2_MAX_MODE_MASK)
                return -EINVAL;

        ar2->mode_mask = mask;

        return count;
}

static DEVICE_ATTR(channel_mask, 0644, ati_remote2_show_channel_mask,
                   ati_remote2_store_channel_mask);

static DEVICE_ATTR(mode_mask, 0644, ati_remote2_show_mode_mask,
                   ati_remote2_store_mode_mask);

static struct attribute *ati_remote2_attrs[] = {
        &dev_attr_channel_mask.attr,
        &dev_attr_mode_mask.attr,
        NULL,
};
ATTRIBUTE_GROUPS(ati_remote2);

static int ati_remote2_probe(struct usb_interface *interface, const struct usb_device_id *id)
{
        struct usb_device *udev = interface_to_usbdev(interface);
        struct usb_host_interface *alt = interface->cur_altsetting;
        struct ati_remote2 *ar2;
        int r;

        if (alt->desc.bInterfaceNumber)
                return -ENODEV;

        ar2 = kzalloc_obj(struct ati_remote2);
        if (!ar2)
                return -ENOMEM;

        ar2->udev = udev;

        /* Sanity check, first interface must have an endpoint */
        if (alt->desc.bNumEndpoints < 1 || !alt->endpoint) {
                dev_err(&interface->dev,
                        "%s(): interface 0 must have an endpoint\n", __func__);
                r = -ENODEV;
                goto fail1;
        }
        ar2->intf[0] = interface;
        ar2->ep[0] = &alt->endpoint[0].desc;

        /* Sanity check, the device must have two interfaces */
        ar2->intf[1] = usb_ifnum_to_if(udev, 1);
        if ((udev->actconfig->desc.bNumInterfaces < 2) || !ar2->intf[1]) {
                dev_err(&interface->dev, "%s(): need 2 interfaces, found %d\n",
                        __func__, udev->actconfig->desc.bNumInterfaces);
                r = -ENODEV;
                goto fail1;
        }

        r = usb_driver_claim_interface(&ati_remote2_driver, ar2->intf[1], ar2);
        if (r)
                goto fail1;

        /* Sanity check, second interface must have an endpoint */
        alt = ar2->intf[1]->cur_altsetting;
        if (alt->desc.bNumEndpoints < 1 || !alt->endpoint) {
                dev_err(&interface->dev,
                        "%s(): interface 1 must have an endpoint\n", __func__);
                r = -ENODEV;
                goto fail2;
        }
        ar2->ep[1] = &alt->endpoint[0].desc;

        r = ati_remote2_urb_init(ar2);
        if (r)
                goto fail3;

        ar2->channel_mask = channel_mask;
        ar2->mode_mask = mode_mask;

        r = ati_remote2_setup(ar2, ar2->channel_mask);
        if (r)
                goto fail3;

        usb_make_path(udev, ar2->phys, sizeof(ar2->phys));
        strlcat(ar2->phys, "/input0", sizeof(ar2->phys));

        strlcat(ar2->name, "ATI Remote Wonder II", sizeof(ar2->name));

        r = ati_remote2_input_init(ar2);
        if (r)
                goto fail3;

        usb_set_intfdata(interface, ar2);

        interface->needs_remote_wakeup = 1;

        return 0;

 fail3:
        ati_remote2_urb_cleanup(ar2);
 fail2:
        usb_driver_release_interface(&ati_remote2_driver, ar2->intf[1]);
 fail1:
        kfree(ar2);

        return r;
}

static void ati_remote2_disconnect(struct usb_interface *interface)
{
        struct ati_remote2 *ar2;
        struct usb_host_interface *alt = interface->cur_altsetting;

        if (alt->desc.bInterfaceNumber)
                return;

        ar2 = usb_get_intfdata(interface);
        usb_set_intfdata(interface, NULL);

        input_unregister_device(ar2->idev);

        ati_remote2_urb_cleanup(ar2);

        usb_driver_release_interface(&ati_remote2_driver, ar2->intf[1]);

        kfree(ar2);
}

static int ati_remote2_suspend(struct usb_interface *interface,
                               pm_message_t message)
{
        struct ati_remote2 *ar2;
        struct usb_host_interface *alt = interface->cur_altsetting;

        if (alt->desc.bInterfaceNumber)
                return 0;

        ar2 = usb_get_intfdata(interface);

        dev_dbg(&ar2->intf[0]->dev, "%s()\n", __func__);

        guard(mutex)(&ati_remote2_mutex);

        if (ar2->flags & ATI_REMOTE2_OPENED)
                ati_remote2_kill_urbs(ar2);

        ar2->flags |= ATI_REMOTE2_SUSPENDED;

        return 0;
}

static int ati_remote2_resume(struct usb_interface *interface)
{
        struct ati_remote2 *ar2;
        struct usb_host_interface *alt = interface->cur_altsetting;
        int r = 0;

        if (alt->desc.bInterfaceNumber)
                return 0;

        ar2 = usb_get_intfdata(interface);

        dev_dbg(&ar2->intf[0]->dev, "%s()\n", __func__);

        guard(mutex)(&ati_remote2_mutex);

        if (ar2->flags & ATI_REMOTE2_OPENED)
                r = ati_remote2_submit_urbs(ar2);

        if (!r)
                ar2->flags &= ~ATI_REMOTE2_SUSPENDED;

        return r;
}

static int ati_remote2_reset_resume(struct usb_interface *interface)
{
        struct ati_remote2 *ar2;
        struct usb_host_interface *alt = interface->cur_altsetting;
        int r = 0;

        if (alt->desc.bInterfaceNumber)
                return 0;

        ar2 = usb_get_intfdata(interface);

        dev_dbg(&ar2->intf[0]->dev, "%s()\n", __func__);

        guard(mutex)(&ati_remote2_mutex);

        r = ati_remote2_setup(ar2, ar2->channel_mask);
        if (r)
                return r;

        if (ar2->flags & ATI_REMOTE2_OPENED)
                r = ati_remote2_submit_urbs(ar2);

        if (!r)
                ar2->flags &= ~ATI_REMOTE2_SUSPENDED;

        return r;
}

static int ati_remote2_pre_reset(struct usb_interface *interface)
{
        struct ati_remote2 *ar2;
        struct usb_host_interface *alt = interface->cur_altsetting;

        if (alt->desc.bInterfaceNumber)
                return 0;

        ar2 = usb_get_intfdata(interface);

        dev_dbg(&ar2->intf[0]->dev, "%s()\n", __func__);

        mutex_lock(&ati_remote2_mutex);

        if (ar2->flags == ATI_REMOTE2_OPENED)
                ati_remote2_kill_urbs(ar2);

        return 0;
}

static int ati_remote2_post_reset(struct usb_interface *interface)
{
        struct ati_remote2 *ar2;
        struct usb_host_interface *alt = interface->cur_altsetting;
        int r = 0;

        if (alt->desc.bInterfaceNumber)
                return 0;

        ar2 = usb_get_intfdata(interface);

        dev_dbg(&ar2->intf[0]->dev, "%s()\n", __func__);

        if (ar2->flags == ATI_REMOTE2_OPENED)
                r = ati_remote2_submit_urbs(ar2);

        mutex_unlock(&ati_remote2_mutex);

        return r;
}

static struct usb_driver ati_remote2_driver = {
        .name       = "ati_remote2",
        .probe      = ati_remote2_probe,
        .disconnect = ati_remote2_disconnect,
        .dev_groups = ati_remote2_groups,
        .id_table   = ati_remote2_id_table,
        .suspend    = ati_remote2_suspend,
        .resume     = ati_remote2_resume,
        .reset_resume = ati_remote2_reset_resume,
        .pre_reset  = ati_remote2_pre_reset,
        .post_reset = ati_remote2_post_reset,
        .supports_autosuspend = 1,
};

module_usb_driver(ati_remote2_driver);