Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[linux-2.6] / drivers / media / video / em28xx / em28xx-input.c
1 /*
2   handle em28xx IR remotes via linux kernel input layer.
3
4    Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
5                       Markus Rechberger <mrechberger@gmail.com>
6                       Mauro Carvalho Chehab <mchehab@infradead.org>
7                       Sascha Sommer <saschasommer@freenet.de>
8
9   This program is free software; you can redistribute it and/or modify
10   it under the terms of the GNU General Public License as published by
11   the Free Software Foundation; either version 2 of the License, or
12   (at your option) any later version.
13
14   This program is distributed in the hope that it will be useful,
15   but WITHOUT ANY WARRANTY; without even the implied warranty of
16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17   GNU General Public License for more details.
18
19   You should have received a copy of the GNU General Public License
20   along with this program; if not, write to the Free Software
21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22  */
23
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/delay.h>
27 #include <linux/interrupt.h>
28 #include <linux/input.h>
29 #include <linux/usb.h>
30
31 #include "em28xx.h"
32
33 #define EM28XX_SNAPSHOT_KEY KEY_CAMERA
34 #define EM28XX_SBUTTON_QUERY_INTERVAL 500
35 #define EM28XX_R0C_USBSUSP_SNAPSHOT 0x20
36
37 static unsigned int ir_debug;
38 module_param(ir_debug, int, 0644);
39 MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
40
41 #define dprintk(fmt, arg...) \
42         if (ir_debug) { \
43                 printk(KERN_DEBUG "%s/ir: " fmt, ir->c.name , ## arg); \
44         }
45
46 /* ----------------------------------------------------------------------- */
47
48 int em28xx_get_key_terratec(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
49 {
50         unsigned char b;
51
52         /* poll IR chip */
53         if (1 != i2c_master_recv(&ir->c, &b, 1)) {
54                 dprintk("read error\n");
55                 return -EIO;
56         }
57
58         /* it seems that 0xFE indicates that a button is still hold
59            down, while 0xff indicates that no button is hold
60            down. 0xfe sequences are sometimes interrupted by 0xFF */
61
62         dprintk("key %02x\n", b);
63
64         if (b == 0xff)
65                 return 0;
66
67         if (b == 0xfe)
68                 /* keep old data */
69                 return 1;
70
71         *ir_key = b;
72         *ir_raw = b;
73         return 1;
74 }
75
76
77 int em28xx_get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
78 {
79         unsigned char buf[2];
80         unsigned char code;
81
82         /* poll IR chip */
83         if (2 != i2c_master_recv(&ir->c, buf, 2))
84                 return -EIO;
85
86         /* Does eliminate repeated parity code */
87         if (buf[1] == 0xff)
88                 return 0;
89
90         ir->old = buf[1];
91
92         /* Rearranges bits to the right order */
93         code =   ((buf[0]&0x01)<<5) | /* 0010 0000 */
94                  ((buf[0]&0x02)<<3) | /* 0001 0000 */
95                  ((buf[0]&0x04)<<1) | /* 0000 1000 */
96                  ((buf[0]&0x08)>>1) | /* 0000 0100 */
97                  ((buf[0]&0x10)>>3) | /* 0000 0010 */
98                  ((buf[0]&0x20)>>5);  /* 0000 0001 */
99
100         dprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x)\n",
101                         code, buf[0]);
102
103         /* return key */
104         *ir_key = code;
105         *ir_raw = code;
106         return 1;
107 }
108
109 int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c *ir, u32 *ir_key,
110                                      u32 *ir_raw)
111 {
112         unsigned char buf[3];
113
114         /* poll IR chip */
115
116         if (3 != i2c_master_recv(&ir->c, buf, 3)) {
117                 dprintk("read error\n");
118                 return -EIO;
119         }
120
121         dprintk("key %02x\n", buf[2]&0x3f);
122         if (buf[0] != 0x00)
123                 return 0;
124
125         *ir_key = buf[2]&0x3f;
126         *ir_raw = buf[2]&0x3f;
127
128         return 1;
129 }
130
131 static void em28xx_query_sbutton(struct work_struct *work)
132 {
133         /* Poll the register and see if the button is depressed */
134         struct em28xx *dev =
135                 container_of(work, struct em28xx, sbutton_query_work.work);
136         int ret;
137
138         ret = em28xx_read_reg(dev, EM28XX_R0C_USBSUSP);
139
140         if (ret & EM28XX_R0C_USBSUSP_SNAPSHOT) {
141                 u8 cleared;
142                 /* Button is depressed, clear the register */
143                 cleared = ((u8) ret) & ~EM28XX_R0C_USBSUSP_SNAPSHOT;
144                 em28xx_write_regs(dev, EM28XX_R0C_USBSUSP, &cleared, 1);
145
146                 /* Not emulate the keypress */
147                 input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
148                                  1);
149                 /* Now unpress the key */
150                 input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
151                                  0);
152         }
153
154         /* Schedule next poll */
155         schedule_delayed_work(&dev->sbutton_query_work,
156                               msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
157 }
158
159 void em28xx_register_snapshot_button(struct em28xx *dev)
160 {
161         struct input_dev *input_dev;
162         int err;
163
164         em28xx_info("Registering snapshot button...\n");
165         input_dev = input_allocate_device();
166         if (!input_dev) {
167                 em28xx_errdev("input_allocate_device failed\n");
168                 return;
169         }
170
171         usb_make_path(dev->udev, dev->snapshot_button_path,
172                       sizeof(dev->snapshot_button_path));
173         strlcat(dev->snapshot_button_path, "/sbutton",
174                 sizeof(dev->snapshot_button_path));
175         INIT_DELAYED_WORK(&dev->sbutton_query_work, em28xx_query_sbutton);
176
177         input_dev->name = "em28xx snapshot button";
178         input_dev->phys = dev->snapshot_button_path;
179         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
180         set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
181         input_dev->keycodesize = 0;
182         input_dev->keycodemax = 0;
183         input_dev->id.bustype = BUS_USB;
184         input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
185         input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
186         input_dev->id.version = 1;
187         input_dev->dev.parent = &dev->udev->dev;
188
189         err = input_register_device(input_dev);
190         if (err) {
191                 em28xx_errdev("input_register_device failed\n");
192                 input_free_device(input_dev);
193                 return;
194         }
195
196         dev->sbutton_input_dev = input_dev;
197         schedule_delayed_work(&dev->sbutton_query_work,
198                               msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
199         return;
200
201 }
202
203 void em28xx_deregister_snapshot_button(struct em28xx *dev)
204 {
205         if (dev->sbutton_input_dev != NULL) {
206                 em28xx_info("Deregistering snapshot button\n");
207                 cancel_rearming_delayed_work(&dev->sbutton_query_work);
208                 input_unregister_device(dev->sbutton_input_dev);
209                 dev->sbutton_input_dev = NULL;
210         }
211         return;
212 }
213
214 /* ----------------------------------------------------------------------
215  * Local variables:
216  * c-basic-offset: 8
217  * End:
218  */