diff options
Diffstat (limited to 'drivers/input/joystick/pxrc.c')
| -rw-r--r-- | drivers/input/joystick/pxrc.c | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/drivers/input/joystick/pxrc.c b/drivers/input/joystick/pxrc.c new file mode 100644 index 0000000000..ea2bf5951d --- /dev/null +++ b/drivers/input/joystick/pxrc.c @@ -0,0 +1,281 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for Phoenix RC Flight Controller Adapter + * + * Copyright (C) 2018 Marcus Folkesson <marcus.folkesson@gmail.com> + */ + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/uaccess.h> +#include <linux/usb.h> +#include <linux/usb/input.h> +#include <linux/mutex.h> +#include <linux/input.h> + +#define PXRC_VENDOR_ID 0x1781 +#define PXRC_PRODUCT_ID 0x0898 + +struct pxrc { + struct input_dev *input; + struct usb_interface *intf; + struct urb *urb; + struct mutex pm_mutex; + bool is_open; + char phys[64]; +}; + +static void pxrc_usb_irq(struct urb *urb) +{ + struct pxrc *pxrc = urb->context; + u8 *data = urb->transfer_buffer; + int error; + + switch (urb->status) { + case 0: + /* success */ + break; + case -ETIME: + /* this urb is timing out */ + dev_dbg(&pxrc->intf->dev, + "%s - urb timed out - was the device unplugged?\n", + __func__); + return; + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + case -EPIPE: + /* this urb is terminated, clean up */ + dev_dbg(&pxrc->intf->dev, "%s - urb shutting down with status: %d\n", + __func__, urb->status); + return; + default: + dev_dbg(&pxrc->intf->dev, "%s - nonzero urb status received: %d\n", + __func__, urb->status); + goto exit; + } + + if (urb->actual_length == 8) { + input_report_abs(pxrc->input, ABS_X, data[0]); + input_report_abs(pxrc->input, ABS_Y, data[2]); + input_report_abs(pxrc->input, ABS_RX, data[3]); + input_report_abs(pxrc->input, ABS_RY, data[4]); + input_report_abs(pxrc->input, ABS_RUDDER, data[5]); + input_report_abs(pxrc->input, ABS_THROTTLE, data[6]); + input_report_abs(pxrc->input, ABS_MISC, data[7]); + + input_report_key(pxrc->input, BTN_A, data[1]); + } + +exit: + /* Resubmit to fetch new fresh URBs */ + error = usb_submit_urb(urb, GFP_ATOMIC); + if (error && error != -EPERM) + dev_err(&pxrc->intf->dev, + "%s - usb_submit_urb failed with result: %d", + __func__, error); +} + +static int pxrc_open(struct input_dev *input) +{ + struct pxrc *pxrc = input_get_drvdata(input); + int retval; + + mutex_lock(&pxrc->pm_mutex); + retval = usb_submit_urb(pxrc->urb, GFP_KERNEL); + if (retval) { + dev_err(&pxrc->intf->dev, + "%s - usb_submit_urb failed, error: %d\n", + __func__, retval); + retval = -EIO; + goto out; + } + + pxrc->is_open = true; + +out: + mutex_unlock(&pxrc->pm_mutex); + return retval; +} + +static void pxrc_close(struct input_dev *input) +{ + struct pxrc *pxrc = input_get_drvdata(input); + + mutex_lock(&pxrc->pm_mutex); + usb_kill_urb(pxrc->urb); + pxrc->is_open = false; + mutex_unlock(&pxrc->pm_mutex); +} + +static void pxrc_free_urb(void *_pxrc) +{ + struct pxrc *pxrc = _pxrc; + + usb_free_urb(pxrc->urb); +} + +static int pxrc_probe(struct usb_interface *intf, + const struct usb_device_id *id) +{ + struct usb_device *udev = interface_to_usbdev(intf); + struct pxrc *pxrc; + struct usb_endpoint_descriptor *epirq; + size_t xfer_size; + void *xfer_buf; + int error; + + /* + * Locate the endpoint information. This device only has an + * interrupt endpoint. + */ + error = usb_find_common_endpoints(intf->cur_altsetting, + NULL, NULL, &epirq, NULL); + if (error) { + dev_err(&intf->dev, "Could not find endpoint\n"); + return error; + } + + pxrc = devm_kzalloc(&intf->dev, sizeof(*pxrc), GFP_KERNEL); + if (!pxrc) + return -ENOMEM; + + mutex_init(&pxrc->pm_mutex); + pxrc->intf = intf; + + usb_set_intfdata(pxrc->intf, pxrc); + + xfer_size = usb_endpoint_maxp(epirq); + xfer_buf = devm_kmalloc(&intf->dev, xfer_size, GFP_KERNEL); + if (!xfer_buf) + return -ENOMEM; + + pxrc->urb = usb_alloc_urb(0, GFP_KERNEL); + if (!pxrc->urb) + return -ENOMEM; + + error = devm_add_action_or_reset(&intf->dev, pxrc_free_urb, pxrc); + if (error) + return error; + + usb_fill_int_urb(pxrc->urb, udev, + usb_rcvintpipe(udev, epirq->bEndpointAddress), + xfer_buf, xfer_size, pxrc_usb_irq, pxrc, 1); + + pxrc->input = devm_input_allocate_device(&intf->dev); + if (!pxrc->input) { + dev_err(&intf->dev, "couldn't allocate input device\n"); + return -ENOMEM; + } + + pxrc->input->name = "PXRC Flight Controller Adapter"; + + usb_make_path(udev, pxrc->phys, sizeof(pxrc->phys)); + strlcat(pxrc->phys, "/input0", sizeof(pxrc->phys)); + pxrc->input->phys = pxrc->phys; + + usb_to_input_id(udev, &pxrc->input->id); + + pxrc->input->open = pxrc_open; + pxrc->input->close = pxrc_close; + + input_set_capability(pxrc->input, EV_KEY, BTN_A); + input_set_abs_params(pxrc->input, ABS_X, 0, 255, 0, 0); + input_set_abs_params(pxrc->input, ABS_Y, 0, 255, 0, 0); + input_set_abs_params(pxrc->input, ABS_RX, 0, 255, 0, 0); + input_set_abs_params(pxrc->input, ABS_RY, 0, 255, 0, 0); + input_set_abs_params(pxrc->input, ABS_RUDDER, 0, 255, 0, 0); + input_set_abs_params(pxrc->input, ABS_THROTTLE, 0, 255, 0, 0); + input_set_abs_params(pxrc->input, ABS_MISC, 0, 255, 0, 0); + + input_set_drvdata(pxrc->input, pxrc); + + error = input_register_device(pxrc->input); + if (error) + return error; + + return 0; +} + +static void pxrc_disconnect(struct usb_interface *intf) +{ + /* All driver resources are devm-managed. */ +} + +static int pxrc_suspend(struct usb_interface *intf, pm_message_t message) +{ + struct pxrc *pxrc = usb_get_intfdata(intf); + + mutex_lock(&pxrc->pm_mutex); + if (pxrc->is_open) + usb_kill_urb(pxrc->urb); + mutex_unlock(&pxrc->pm_mutex); + + return 0; +} + +static int pxrc_resume(struct usb_interface *intf) +{ + struct pxrc *pxrc = usb_get_intfdata(intf); + int retval = 0; + + mutex_lock(&pxrc->pm_mutex); + if (pxrc->is_open && usb_submit_urb(pxrc->urb, GFP_KERNEL) < 0) + retval = -EIO; + + mutex_unlock(&pxrc->pm_mutex); + return retval; +} + +static int pxrc_pre_reset(struct usb_interface *intf) +{ + struct pxrc *pxrc = usb_get_intfdata(intf); + + mutex_lock(&pxrc->pm_mutex); + usb_kill_urb(pxrc->urb); + return 0; +} + +static int pxrc_post_reset(struct usb_interface *intf) +{ + struct pxrc *pxrc = usb_get_intfdata(intf); + int retval = 0; + + if (pxrc->is_open && usb_submit_urb(pxrc->urb, GFP_KERNEL) < 0) + retval = -EIO; + + mutex_unlock(&pxrc->pm_mutex); + + return retval; +} + +static int pxrc_reset_resume(struct usb_interface *intf) +{ + return pxrc_resume(intf); +} + +static const struct usb_device_id pxrc_table[] = { + { USB_DEVICE(PXRC_VENDOR_ID, PXRC_PRODUCT_ID) }, + { } +}; +MODULE_DEVICE_TABLE(usb, pxrc_table); + +static struct usb_driver pxrc_driver = { + .name = "pxrc", + .probe = pxrc_probe, + .disconnect = pxrc_disconnect, + .id_table = pxrc_table, + .suspend = pxrc_suspend, + .resume = pxrc_resume, + .pre_reset = pxrc_pre_reset, + .post_reset = pxrc_post_reset, + .reset_resume = pxrc_reset_resume, +}; + +module_usb_driver(pxrc_driver); + +MODULE_AUTHOR("Marcus Folkesson <marcus.folkesson@gmail.com>"); +MODULE_DESCRIPTION("PhoenixRC Flight Controller Adapter"); +MODULE_LICENSE("GPL v2"); |