xref: /openbmc/linux/drivers/hid/hid-samsung.c (revision a579510a)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  HID driver for some samsung "special" devices
4  *
5  *  Copyright (c) 1999 Andreas Gal
6  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
7  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
8  *  Copyright (c) 2006-2007 Jiri Kosina
9  *  Copyright (c) 2008 Jiri Slaby
10  *  Copyright (c) 2010 Don Prince <dhprince.devel@yahoo.co.uk>
11  *
12  *  This driver supports several HID devices:
13  *
14  *  [0419:0001] Samsung IrDA remote controller (reports as Cypress USB Mouse).
15  *	various hid report fixups for different variants.
16  *
17  *  [0419:0600] Creative Desktop Wireless 6000 keyboard/mouse combo
18  *	several key mappings used from the consumer usage page
19  *	deviate from the USB HUT 1.12 standard.
20  */
21 
22 /*
23  */
24 
25 #include <linux/device.h>
26 #include <linux/usb.h>
27 #include <linux/hid.h>
28 #include <linux/module.h>
29 
30 #include "hid-ids.h"
31 
32 /*
33  * There are several variants for 0419:0001:
34  *
35  * 1. 184 byte report descriptor
36  * Vendor specific report #4 has a size of 48 bit,
37  * and therefore is not accepted when inspecting the descriptors.
38  * As a workaround we reinterpret the report as:
39  *   Variable type, count 6, size 8 bit, log. maximum 255
40  * The burden to reconstruct the data is moved into user space.
41  *
42  * 2. 203 byte report descriptor
43  * Report #4 has an array field with logical range 0..18 instead of 1..15.
44  *
45  * 3. 135 byte report descriptor
46  * Report #4 has an array field with logical range 0..17 instead of 1..14.
47  *
48  * 4. 171 byte report descriptor
49  * Report #3 has an array field with logical range 0..1 instead of 1..3.
50  */
samsung_irda_dev_trace(struct hid_device * hdev,unsigned int rsize)51 static inline void samsung_irda_dev_trace(struct hid_device *hdev,
52 		unsigned int rsize)
53 {
54 	hid_info(hdev, "fixing up Samsung IrDA %d byte report descriptor\n",
55 		 rsize);
56 }
57 
samsung_irda_report_fixup(struct hid_device * hdev,__u8 * rdesc,unsigned int * rsize)58 static __u8 *samsung_irda_report_fixup(struct hid_device *hdev, __u8 *rdesc,
59 		unsigned int *rsize)
60 {
61 	if (*rsize == 184 && rdesc[175] == 0x25 && rdesc[176] == 0x40 &&
62 			rdesc[177] == 0x75 && rdesc[178] == 0x30 &&
63 			rdesc[179] == 0x95 && rdesc[180] == 0x01 &&
64 			rdesc[182] == 0x40) {
65 		samsung_irda_dev_trace(hdev, 184);
66 		rdesc[176] = 0xff;
67 		rdesc[178] = 0x08;
68 		rdesc[180] = 0x06;
69 		rdesc[182] = 0x42;
70 	} else
71 	if (*rsize == 203 && rdesc[192] == 0x15 && rdesc[193] == 0x0 &&
72 			rdesc[194] == 0x25 && rdesc[195] == 0x12) {
73 		samsung_irda_dev_trace(hdev, 203);
74 		rdesc[193] = 0x1;
75 		rdesc[195] = 0xf;
76 	} else
77 	if (*rsize == 135 && rdesc[124] == 0x15 && rdesc[125] == 0x0 &&
78 			rdesc[126] == 0x25 && rdesc[127] == 0x11) {
79 		samsung_irda_dev_trace(hdev, 135);
80 		rdesc[125] = 0x1;
81 		rdesc[127] = 0xe;
82 	} else
83 	if (*rsize == 171 && rdesc[160] == 0x15 && rdesc[161] == 0x0 &&
84 			rdesc[162] == 0x25 && rdesc[163] == 0x01) {
85 		samsung_irda_dev_trace(hdev, 171);
86 		rdesc[161] = 0x1;
87 		rdesc[163] = 0x3;
88 	}
89 	return rdesc;
90 }
91 
92 #define samsung_kbd_mouse_map_key_clear(c) \
93 	hid_map_usage_clear(hi, usage, bit, max, EV_KEY, (c))
94 
samsung_kbd_mouse_input_mapping(struct hid_device * hdev,struct hid_input * hi,struct hid_field * field,struct hid_usage * usage,unsigned long ** bit,int * max)95 static int samsung_kbd_mouse_input_mapping(struct hid_device *hdev,
96 	struct hid_input *hi, struct hid_field *field, struct hid_usage *usage,
97 	unsigned long **bit, int *max)
98 {
99 	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
100 	unsigned short ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
101 
102 	if (1 != ifnum || HID_UP_CONSUMER != (usage->hid & HID_USAGE_PAGE))
103 		return 0;
104 
105 	dbg_hid("samsung wireless keyboard/mouse input mapping event [0x%x]\n",
106 		usage->hid & HID_USAGE);
107 
108 	switch (usage->hid & HID_USAGE) {
109 	/* report 2 */
110 	case 0x183: samsung_kbd_mouse_map_key_clear(KEY_MEDIA); break;
111 	case 0x195: samsung_kbd_mouse_map_key_clear(KEY_EMAIL);	break;
112 	case 0x196: samsung_kbd_mouse_map_key_clear(KEY_CALC); break;
113 	case 0x197: samsung_kbd_mouse_map_key_clear(KEY_COMPUTER); break;
114 	case 0x22b: samsung_kbd_mouse_map_key_clear(KEY_SEARCH); break;
115 	case 0x22c: samsung_kbd_mouse_map_key_clear(KEY_WWW); break;
116 	case 0x22d: samsung_kbd_mouse_map_key_clear(KEY_BACK); break;
117 	case 0x22e: samsung_kbd_mouse_map_key_clear(KEY_FORWARD); break;
118 	case 0x22f: samsung_kbd_mouse_map_key_clear(KEY_FAVORITES); break;
119 	case 0x230: samsung_kbd_mouse_map_key_clear(KEY_REFRESH); break;
120 	case 0x231: samsung_kbd_mouse_map_key_clear(KEY_STOP); break;
121 	default:
122 		return 0;
123 	}
124 
125 	return 1;
126 }
127 
samsung_report_fixup(struct hid_device * hdev,__u8 * rdesc,unsigned int * rsize)128 static __u8 *samsung_report_fixup(struct hid_device *hdev, __u8 *rdesc,
129 	unsigned int *rsize)
130 {
131 	if (USB_DEVICE_ID_SAMSUNG_IR_REMOTE == hdev->product)
132 		rdesc = samsung_irda_report_fixup(hdev, rdesc, rsize);
133 	return rdesc;
134 }
135 
samsung_input_mapping(struct hid_device * hdev,struct hid_input * hi,struct hid_field * field,struct hid_usage * usage,unsigned long ** bit,int * max)136 static int samsung_input_mapping(struct hid_device *hdev, struct hid_input *hi,
137 	struct hid_field *field, struct hid_usage *usage,
138 	unsigned long **bit, int *max)
139 {
140 	int ret = 0;
141 
142 	if (USB_DEVICE_ID_SAMSUNG_WIRELESS_KBD_MOUSE == hdev->product)
143 		ret = samsung_kbd_mouse_input_mapping(hdev,
144 			hi, field, usage, bit, max);
145 
146 	return ret;
147 }
148 
samsung_probe(struct hid_device * hdev,const struct hid_device_id * id)149 static int samsung_probe(struct hid_device *hdev,
150 		const struct hid_device_id *id)
151 {
152 	int ret;
153 	unsigned int cmask = HID_CONNECT_DEFAULT;
154 
155 	if (!hid_is_usb(hdev))
156 		return -EINVAL;
157 
158 	ret = hid_parse(hdev);
159 	if (ret) {
160 		hid_err(hdev, "parse failed\n");
161 		goto err_free;
162 	}
163 
164 	if (USB_DEVICE_ID_SAMSUNG_IR_REMOTE == hdev->product) {
165 		if (hdev->rsize == 184) {
166 			/* disable hidinput, force hiddev */
167 			cmask = (cmask & ~HID_CONNECT_HIDINPUT) |
168 				HID_CONNECT_HIDDEV_FORCE;
169 		}
170 	}
171 
172 	ret = hid_hw_start(hdev, cmask);
173 	if (ret) {
174 		hid_err(hdev, "hw start failed\n");
175 		goto err_free;
176 	}
177 
178 	return 0;
179 err_free:
180 	return ret;
181 }
182 
183 static const struct hid_device_id samsung_devices[] = {
184 	{ HID_USB_DEVICE(USB_VENDOR_ID_SAMSUNG, USB_DEVICE_ID_SAMSUNG_IR_REMOTE) },
185 	{ HID_USB_DEVICE(USB_VENDOR_ID_SAMSUNG, USB_DEVICE_ID_SAMSUNG_WIRELESS_KBD_MOUSE) },
186 	{ }
187 };
188 MODULE_DEVICE_TABLE(hid, samsung_devices);
189 
190 static struct hid_driver samsung_driver = {
191 	.name = "samsung",
192 	.id_table = samsung_devices,
193 	.report_fixup = samsung_report_fixup,
194 	.input_mapping = samsung_input_mapping,
195 	.probe = samsung_probe,
196 };
197 module_hid_driver(samsung_driver);
198 
199 MODULE_LICENSE("GPL");
200