fbmem: don't allow too huge resolutions
[linux-2.6-microblaze.git] / drivers / hid / hid-lgff.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Force feedback support for hid-compliant for some of the devices from
4  * Logitech, namely:
5  * - WingMan Cordless RumblePad
6  * - WingMan Force 3D
7  *
8  *  Copyright (c) 2002-2004 Johann Deneux
9  *  Copyright (c) 2006 Anssi Hannula <anssi.hannula@gmail.com>
10  */
11
12 /*
13  *
14  * Should you need to contact me, the author, you can do so by
15  * e-mail - mail your message to <johann.deneux@it.uu.se>
16  */
17
18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
20 #include <linux/input.h>
21 #include <linux/hid.h>
22
23 #include "hid-lg.h"
24
25 struct dev_type {
26         u16 idVendor;
27         u16 idProduct;
28         const signed short *ff;
29 };
30
31 static const signed short ff_rumble[] = {
32         FF_RUMBLE,
33         -1
34 };
35
36 static const signed short ff_joystick[] = {
37         FF_CONSTANT,
38         -1
39 };
40
41 static const signed short ff_joystick_ac[] = {
42         FF_CONSTANT,
43         FF_AUTOCENTER,
44         -1
45 };
46
47 static const struct dev_type devices[] = {
48         { 0x046d, 0xc211, ff_rumble },
49         { 0x046d, 0xc219, ff_rumble },
50         { 0x046d, 0xc283, ff_joystick },
51         { 0x046d, 0xc286, ff_joystick_ac },
52         { 0x046d, 0xc287, ff_joystick_ac },
53         { 0x046d, 0xc293, ff_joystick },
54         { 0x046d, 0xc295, ff_joystick },
55 };
56
57 static int hid_lgff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
58 {
59         struct hid_device *hid = input_get_drvdata(dev);
60         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
61         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
62         int x, y;
63         unsigned int left, right;
64
65 #define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff
66
67         switch (effect->type) {
68         case FF_CONSTANT:
69                 x = effect->u.ramp.start_level + 0x7f;  /* 0x7f is center */
70                 y = effect->u.ramp.end_level + 0x7f;
71                 CLAMP(x);
72                 CLAMP(y);
73                 report->field[0]->value[0] = 0x51;
74                 report->field[0]->value[1] = 0x08;
75                 report->field[0]->value[2] = x;
76                 report->field[0]->value[3] = y;
77                 dbg_hid("(x, y)=(%04x, %04x)\n", x, y);
78                 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
79                 break;
80
81         case FF_RUMBLE:
82                 right = effect->u.rumble.strong_magnitude;
83                 left = effect->u.rumble.weak_magnitude;
84                 right = right * 0xff / 0xffff;
85                 left = left * 0xff / 0xffff;
86                 CLAMP(left);
87                 CLAMP(right);
88                 report->field[0]->value[0] = 0x42;
89                 report->field[0]->value[1] = 0x00;
90                 report->field[0]->value[2] = left;
91                 report->field[0]->value[3] = right;
92                 dbg_hid("(left, right)=(%04x, %04x)\n", left, right);
93                 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
94                 break;
95         }
96         return 0;
97 }
98
99 static void hid_lgff_set_autocenter(struct input_dev *dev, u16 magnitude)
100 {
101         struct hid_device *hid = input_get_drvdata(dev);
102         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
103         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
104         __s32 *value = report->field[0]->value;
105         magnitude = (magnitude >> 12) & 0xf;
106         *value++ = 0xfe;
107         *value++ = 0x0d;
108         *value++ = magnitude;   /* clockwise strength */
109         *value++ = magnitude;   /* counter-clockwise strength */
110         *value++ = 0x80;
111         *value++ = 0x00;
112         *value = 0x00;
113         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
114 }
115
116 int lgff_init(struct hid_device* hid)
117 {
118         struct hid_input *hidinput;
119         struct input_dev *dev;
120         const signed short *ff_bits = ff_joystick;
121         int error;
122         int i;
123
124         if (list_empty(&hid->inputs)) {
125                 hid_err(hid, "no inputs found\n");
126                 return -ENODEV;
127         }
128         hidinput = list_entry(hid->inputs.next, struct hid_input, list);
129         dev = hidinput->input;
130
131         /* Check that the report looks ok */
132         if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7))
133                 return -ENODEV;
134
135         for (i = 0; i < ARRAY_SIZE(devices); i++) {
136                 if (dev->id.vendor == devices[i].idVendor &&
137                     dev->id.product == devices[i].idProduct) {
138                         ff_bits = devices[i].ff;
139                         break;
140                 }
141         }
142
143         for (i = 0; ff_bits[i] >= 0; i++)
144                 set_bit(ff_bits[i], dev->ffbit);
145
146         error = input_ff_create_memless(dev, NULL, hid_lgff_play);
147         if (error)
148                 return error;
149
150         if ( test_bit(FF_AUTOCENTER, dev->ffbit) )
151                 dev->ff->set_autocenter = hid_lgff_set_autocenter;
152
153         pr_info("Force feedback for Logitech force feedback devices by Johann Deneux <johann.deneux@it.uu.se>\n");
154
155         return 0;
156 }