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abf832bfc3
It is safe to use devres allocation within the hid subsystem: - the devres release is called _after_ the call to .remove(), meaning that no freed pointers will exists while removing the device - if a .probe() fails, devres releases all the allocated ressources before going to the next driver: there will not be ghost ressources attached to a hid device if several drivers are probed. Given that, we can clean up a little some of the HID drivers. These ones are trivial: - there is only one kzalloc in the driver - the .remove() callback contains only one kfree on top of hid_hw_stop() - the error path in the probe is easy enough to be manually checked Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
139 lines
3.3 KiB
C
139 lines
3.3 KiB
C
/*
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* HID driver for some a4tech "special" devices
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*
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* Copyright (c) 1999 Andreas Gal
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* Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
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* Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
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* Copyright (c) 2006-2007 Jiri Kosina
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* Copyright (c) 2008 Jiri Slaby
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/device.h>
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#include <linux/input.h>
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#include <linux/hid.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include "hid-ids.h"
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#define A4_2WHEEL_MOUSE_HACK_7 0x01
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#define A4_2WHEEL_MOUSE_HACK_B8 0x02
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struct a4tech_sc {
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unsigned long quirks;
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unsigned int hw_wheel;
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__s32 delayed_value;
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};
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static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
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struct hid_field *field, struct hid_usage *usage,
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unsigned long **bit, int *max)
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{
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struct a4tech_sc *a4 = hid_get_drvdata(hdev);
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if (usage->type == EV_REL && usage->code == REL_WHEEL)
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set_bit(REL_HWHEEL, *bit);
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if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
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return -1;
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return 0;
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}
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static int a4_event(struct hid_device *hdev, struct hid_field *field,
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struct hid_usage *usage, __s32 value)
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{
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struct a4tech_sc *a4 = hid_get_drvdata(hdev);
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struct input_dev *input;
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if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
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!usage->type)
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return 0;
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input = field->hidinput->input;
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if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
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if (usage->type == EV_REL && usage->code == REL_WHEEL) {
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a4->delayed_value = value;
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return 1;
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}
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if (usage->hid == 0x000100b8) {
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input_event(input, EV_REL, value ? REL_HWHEEL :
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REL_WHEEL, a4->delayed_value);
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return 1;
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}
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}
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if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) {
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a4->hw_wheel = !!value;
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return 1;
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}
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if (usage->code == REL_WHEEL && a4->hw_wheel) {
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input_event(input, usage->type, REL_HWHEEL, value);
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return 1;
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}
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return 0;
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}
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static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
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{
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struct a4tech_sc *a4;
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int ret;
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a4 = devm_kzalloc(&hdev->dev, sizeof(*a4), GFP_KERNEL);
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if (a4 == NULL) {
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hid_err(hdev, "can't alloc device descriptor\n");
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return -ENOMEM;
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}
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a4->quirks = id->driver_data;
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hid_set_drvdata(hdev, a4);
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ret = hid_parse(hdev);
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if (ret) {
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hid_err(hdev, "parse failed\n");
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return ret;
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}
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ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
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if (ret) {
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hid_err(hdev, "hw start failed\n");
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return ret;
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}
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return 0;
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}
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static const struct hid_device_id a4_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU),
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.driver_data = A4_2WHEEL_MOUSE_HACK_7 },
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{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D),
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.driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
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{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649),
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.driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, a4_devices);
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static struct hid_driver a4_driver = {
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.name = "a4tech",
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.id_table = a4_devices,
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.input_mapped = a4_input_mapped,
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.event = a4_event,
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.probe = a4_probe,
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};
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module_hid_driver(a4_driver);
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MODULE_LICENSE("GPL");
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