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Linux/drivers/hid/hid-roccat-savu.c

  1 /*
  2  * Roccat Savu driver for Linux
  3  *
  4  * Copyright (c) 2012 Stefan Achatz <erazor_de@users.sourceforge.net>
  5  */
  6 
  7 /*
  8  * This program is free software; you can redistribute it and/or modify it
  9  * under the terms of the GNU General Public License as published by the Free
 10  * Software Foundation; either version 2 of the License, or (at your option)
 11  * any later version.
 12  */
 13 
 14 /* Roccat Savu is a gamer mouse with macro keys that can be configured in
 15  * 5 profiles.
 16  */
 17 
 18 #include <linux/device.h>
 19 #include <linux/input.h>
 20 #include <linux/hid.h>
 21 #include <linux/module.h>
 22 #include <linux/slab.h>
 23 #include <linux/hid-roccat.h>
 24 #include "hid-ids.h"
 25 #include "hid-roccat-common.h"
 26 #include "hid-roccat-savu.h"
 27 
 28 static struct class *savu_class;
 29 
 30 ROCCAT_COMMON2_BIN_ATTRIBUTE_W(control, 0x4, 0x03);
 31 ROCCAT_COMMON2_BIN_ATTRIBUTE_RW(profile, 0x5, 0x03);
 32 ROCCAT_COMMON2_BIN_ATTRIBUTE_RW(general, 0x6, 0x10);
 33 ROCCAT_COMMON2_BIN_ATTRIBUTE_RW(buttons, 0x7, 0x2f);
 34 ROCCAT_COMMON2_BIN_ATTRIBUTE_RW(macro, 0x8, 0x0823);
 35 ROCCAT_COMMON2_BIN_ATTRIBUTE_RW(info, 0x9, 0x08);
 36 ROCCAT_COMMON2_BIN_ATTRIBUTE_RW(sensor, 0xc, 0x04);
 37 
 38 static struct bin_attribute *savu_bin_attrs[] = {
 39         &bin_attr_control,
 40         &bin_attr_profile,
 41         &bin_attr_general,
 42         &bin_attr_buttons,
 43         &bin_attr_macro,
 44         &bin_attr_info,
 45         &bin_attr_sensor,
 46         NULL,
 47 };
 48 
 49 static const struct attribute_group savu_group = {
 50         .bin_attrs = savu_bin_attrs,
 51 };
 52 
 53 static const struct attribute_group *savu_groups[] = {
 54         &savu_group,
 55         NULL,
 56 };
 57 
 58 static int savu_init_specials(struct hid_device *hdev)
 59 {
 60         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
 61         struct usb_device *usb_dev = interface_to_usbdev(intf);
 62         struct roccat_common2_device *savu;
 63         int retval;
 64 
 65         if (intf->cur_altsetting->desc.bInterfaceProtocol
 66                         != USB_INTERFACE_PROTOCOL_MOUSE) {
 67                 hid_set_drvdata(hdev, NULL);
 68                 return 0;
 69         }
 70 
 71         savu = kzalloc(sizeof(*savu), GFP_KERNEL);
 72         if (!savu) {
 73                 hid_err(hdev, "can't alloc device descriptor\n");
 74                 return -ENOMEM;
 75         }
 76         hid_set_drvdata(hdev, savu);
 77 
 78         retval = roccat_common2_device_init_struct(usb_dev, savu);
 79         if (retval) {
 80                 hid_err(hdev, "couldn't init Savu device\n");
 81                 goto exit_free;
 82         }
 83 
 84         retval = roccat_connect(savu_class, hdev,
 85                         sizeof(struct savu_roccat_report));
 86         if (retval < 0) {
 87                 hid_err(hdev, "couldn't init char dev\n");
 88         } else {
 89                 savu->chrdev_minor = retval;
 90                 savu->roccat_claimed = 1;
 91         }
 92 
 93         return 0;
 94 exit_free:
 95         kfree(savu);
 96         return retval;
 97 }
 98 
 99 static void savu_remove_specials(struct hid_device *hdev)
100 {
101         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
102         struct roccat_common2_device *savu;
103 
104         if (intf->cur_altsetting->desc.bInterfaceProtocol
105                         != USB_INTERFACE_PROTOCOL_MOUSE)
106                 return;
107 
108         savu = hid_get_drvdata(hdev);
109         if (savu->roccat_claimed)
110                 roccat_disconnect(savu->chrdev_minor);
111         kfree(savu);
112 }
113 
114 static int savu_probe(struct hid_device *hdev,
115                 const struct hid_device_id *id)
116 {
117         int retval;
118 
119         retval = hid_parse(hdev);
120         if (retval) {
121                 hid_err(hdev, "parse failed\n");
122                 goto exit;
123         }
124 
125         retval = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
126         if (retval) {
127                 hid_err(hdev, "hw start failed\n");
128                 goto exit;
129         }
130 
131         retval = savu_init_specials(hdev);
132         if (retval) {
133                 hid_err(hdev, "couldn't install mouse\n");
134                 goto exit_stop;
135         }
136 
137         return 0;
138 
139 exit_stop:
140         hid_hw_stop(hdev);
141 exit:
142         return retval;
143 }
144 
145 static void savu_remove(struct hid_device *hdev)
146 {
147         savu_remove_specials(hdev);
148         hid_hw_stop(hdev);
149 }
150 
151 static void savu_report_to_chrdev(struct roccat_common2_device const *savu,
152                 u8 const *data)
153 {
154         struct savu_roccat_report roccat_report;
155         struct savu_mouse_report_special const *special_report;
156 
157         if (data[0] != SAVU_MOUSE_REPORT_NUMBER_SPECIAL)
158                 return;
159 
160         special_report = (struct savu_mouse_report_special const *)data;
161 
162         roccat_report.type = special_report->type;
163         roccat_report.data[0] = special_report->data[0];
164         roccat_report.data[1] = special_report->data[1];
165         roccat_report_event(savu->chrdev_minor,
166                         (uint8_t const *)&roccat_report);
167 }
168 
169 static int savu_raw_event(struct hid_device *hdev,
170                 struct hid_report *report, u8 *data, int size)
171 {
172         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
173         struct roccat_common2_device *savu = hid_get_drvdata(hdev);
174 
175         if (intf->cur_altsetting->desc.bInterfaceProtocol
176                         != USB_INTERFACE_PROTOCOL_MOUSE)
177                 return 0;
178 
179         if (savu == NULL)
180                 return 0;
181 
182         if (savu->roccat_claimed)
183                 savu_report_to_chrdev(savu, data);
184 
185         return 0;
186 }
187 
188 static const struct hid_device_id savu_devices[] = {
189         { HID_USB_DEVICE(USB_VENDOR_ID_ROCCAT, USB_DEVICE_ID_ROCCAT_SAVU) },
190         { }
191 };
192 
193 MODULE_DEVICE_TABLE(hid, savu_devices);
194 
195 static struct hid_driver savu_driver = {
196                 .name = "savu",
197                 .id_table = savu_devices,
198                 .probe = savu_probe,
199                 .remove = savu_remove,
200                 .raw_event = savu_raw_event
201 };
202 
203 static int __init savu_init(void)
204 {
205         int retval;
206 
207         savu_class = class_create(THIS_MODULE, "savu");
208         if (IS_ERR(savu_class))
209                 return PTR_ERR(savu_class);
210         savu_class->dev_groups = savu_groups;
211 
212         retval = hid_register_driver(&savu_driver);
213         if (retval)
214                 class_destroy(savu_class);
215         return retval;
216 }
217 
218 static void __exit savu_exit(void)
219 {
220         hid_unregister_driver(&savu_driver);
221         class_destroy(savu_class);
222 }
223 
224 module_init(savu_init);
225 module_exit(savu_exit);
226 
227 MODULE_AUTHOR("Stefan Achatz");
228 MODULE_DESCRIPTION("USB Roccat Savu driver");
229 MODULE_LICENSE("GPL v2");
230 

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