1 /*
2  * FireDTV driver (formerly known as FireSAT)
3  *
4  * Copyright (C) 2004 Andreas Monitzer <andy@monitzer.com>
5  * Copyright (C) 2008 Henrik Kurelid <henrik@kurelid.se>
6  *
7  *	This program is free software; you can redistribute it and/or
8  *	modify it under the terms of the GNU General Public License as
9  *	published by the Free Software Foundation; either version 2 of
10  *	the License, or (at your option) any later version.
11  */
12 
13 #include <linux/device.h>
14 #include <linux/dvb/ca.h>
15 #include <linux/fs.h>
16 #include <linux/module.h>
17 
18 #include <dvbdev.h>
19 
20 #include "firedtv.h"
21 
22 #define EN50221_TAG_APP_INFO_ENQUIRY	0x9f8020
23 #define EN50221_TAG_CA_INFO_ENQUIRY	0x9f8030
24 #define EN50221_TAG_CA_PMT		0x9f8032
25 #define EN50221_TAG_ENTER_MENU		0x9f8022
26 
27 static int fdtv_ca_ready(struct firedtv_tuner_status *stat)
28 {
29 	return stat->ca_initialization_status	== 1 &&
30 	       stat->ca_error_flag		== 0 &&
31 	       stat->ca_dvb_flag		== 1 &&
32 	       stat->ca_module_present_status	== 1;
33 }
34 
35 static int fdtv_get_ca_flags(struct firedtv_tuner_status *stat)
36 {
37 	int flags = 0;
38 
39 	if (stat->ca_module_present_status == 1)
40 		flags |= CA_CI_MODULE_PRESENT;
41 	if (stat->ca_initialization_status == 1 &&
42 	    stat->ca_error_flag            == 0 &&
43 	    stat->ca_dvb_flag              == 1)
44 		flags |= CA_CI_MODULE_READY;
45 	return flags;
46 }
47 
48 static int fdtv_ca_get_caps(void *arg)
49 {
50 	struct ca_caps *cap = arg;
51 
52 	cap->slot_num = 1;
53 	cap->slot_type = CA_CI;
54 	cap->descr_num = 1;
55 	cap->descr_type = CA_ECD;
56 	return 0;
57 }
58 
59 static int fdtv_ca_get_slot_info(struct firedtv *fdtv, void *arg)
60 {
61 	struct firedtv_tuner_status stat;
62 	struct ca_slot_info *slot = arg;
63 	int err;
64 
65 	err = avc_tuner_status(fdtv, &stat);
66 	if (err)
67 		return err;
68 
69 	if (slot->num != 0)
70 		return -EACCES;
71 
72 	slot->type = CA_CI;
73 	slot->flags = fdtv_get_ca_flags(&stat);
74 	return 0;
75 }
76 
77 static int fdtv_ca_app_info(struct firedtv *fdtv, void *arg)
78 {
79 	struct ca_msg *reply = arg;
80 
81 	return avc_ca_app_info(fdtv, reply->msg, &reply->length);
82 }
83 
84 static int fdtv_ca_info(struct firedtv *fdtv, void *arg)
85 {
86 	struct ca_msg *reply = arg;
87 
88 	return avc_ca_info(fdtv, reply->msg, &reply->length);
89 }
90 
91 static int fdtv_ca_get_mmi(struct firedtv *fdtv, void *arg)
92 {
93 	struct ca_msg *reply = arg;
94 
95 	return avc_ca_get_mmi(fdtv, reply->msg, &reply->length);
96 }
97 
98 static int fdtv_ca_get_msg(struct firedtv *fdtv, void *arg)
99 {
100 	struct firedtv_tuner_status stat;
101 	int err;
102 
103 	switch (fdtv->ca_last_command) {
104 	case EN50221_TAG_APP_INFO_ENQUIRY:
105 		err = fdtv_ca_app_info(fdtv, arg);
106 		break;
107 	case EN50221_TAG_CA_INFO_ENQUIRY:
108 		err = fdtv_ca_info(fdtv, arg);
109 		break;
110 	default:
111 		err = avc_tuner_status(fdtv, &stat);
112 		if (err)
113 			break;
114 		if (stat.ca_mmi == 1)
115 			err = fdtv_ca_get_mmi(fdtv, arg);
116 		else {
117 			dev_info(fdtv->device, "unhandled CA message 0x%08x\n",
118 				 fdtv->ca_last_command);
119 			err = -EACCES;
120 		}
121 	}
122 	fdtv->ca_last_command = 0;
123 	return err;
124 }
125 
126 static int fdtv_ca_pmt(struct firedtv *fdtv, void *arg)
127 {
128 	struct ca_msg *msg = arg;
129 	int data_pos;
130 	int data_length;
131 	int i;
132 
133 	data_pos = 4;
134 	if (msg->msg[3] & 0x80) {
135 		data_length = 0;
136 		for (i = 0; i < (msg->msg[3] & 0x7f); i++)
137 			data_length = (data_length << 8) + msg->msg[data_pos++];
138 	} else {
139 		data_length = msg->msg[3];
140 	}
141 
142 	return avc_ca_pmt(fdtv, &msg->msg[data_pos], data_length);
143 }
144 
145 static int fdtv_ca_send_msg(struct firedtv *fdtv, void *arg)
146 {
147 	struct ca_msg *msg = arg;
148 	int err;
149 
150 	/* Do we need a semaphore for this? */
151 	fdtv->ca_last_command =
152 		(msg->msg[0] << 16) + (msg->msg[1] << 8) + msg->msg[2];
153 	switch (fdtv->ca_last_command) {
154 	case EN50221_TAG_CA_PMT:
155 		err = fdtv_ca_pmt(fdtv, arg);
156 		break;
157 	case EN50221_TAG_APP_INFO_ENQUIRY:
158 		/* handled in ca_get_msg */
159 		err = 0;
160 		break;
161 	case EN50221_TAG_CA_INFO_ENQUIRY:
162 		/* handled in ca_get_msg */
163 		err = 0;
164 		break;
165 	case EN50221_TAG_ENTER_MENU:
166 		err = avc_ca_enter_menu(fdtv);
167 		break;
168 	default:
169 		dev_err(fdtv->device, "unhandled CA message 0x%08x\n",
170 			fdtv->ca_last_command);
171 		err = -EACCES;
172 	}
173 	return err;
174 }
175 
176 static int fdtv_ca_ioctl(struct file *file, unsigned int cmd, void *arg)
177 {
178 	struct dvb_device *dvbdev = file->private_data;
179 	struct firedtv *fdtv = dvbdev->priv;
180 	struct firedtv_tuner_status stat;
181 	int err;
182 
183 	switch (cmd) {
184 	case CA_RESET:
185 		err = avc_ca_reset(fdtv);
186 		break;
187 	case CA_GET_CAP:
188 		err = fdtv_ca_get_caps(arg);
189 		break;
190 	case CA_GET_SLOT_INFO:
191 		err = fdtv_ca_get_slot_info(fdtv, arg);
192 		break;
193 	case CA_GET_MSG:
194 		err = fdtv_ca_get_msg(fdtv, arg);
195 		break;
196 	case CA_SEND_MSG:
197 		err = fdtv_ca_send_msg(fdtv, arg);
198 		break;
199 	default:
200 		dev_info(fdtv->device, "unhandled CA ioctl %u\n", cmd);
201 		err = -EOPNOTSUPP;
202 	}
203 
204 	/* FIXME Is this necessary? */
205 	avc_tuner_status(fdtv, &stat);
206 
207 	return err;
208 }
209 
210 static unsigned int fdtv_ca_io_poll(struct file *file, poll_table *wait)
211 {
212 	return POLLIN;
213 }
214 
215 static const struct file_operations fdtv_ca_fops = {
216 	.owner		= THIS_MODULE,
217 	.unlocked_ioctl	= dvb_generic_ioctl,
218 	.open		= dvb_generic_open,
219 	.release	= dvb_generic_release,
220 	.poll		= fdtv_ca_io_poll,
221 	.llseek		= noop_llseek,
222 };
223 
224 static struct dvb_device fdtv_ca = {
225 	.users		= 1,
226 	.readers	= 1,
227 	.writers	= 1,
228 	.fops		= &fdtv_ca_fops,
229 	.kernel_ioctl	= fdtv_ca_ioctl,
230 };
231 
232 int fdtv_ca_register(struct firedtv *fdtv)
233 {
234 	struct firedtv_tuner_status stat;
235 	int err;
236 
237 	if (avc_tuner_status(fdtv, &stat))
238 		return -EINVAL;
239 
240 	if (!fdtv_ca_ready(&stat))
241 		return -EFAULT;
242 
243 	err = dvb_register_device(&fdtv->adapter, &fdtv->cadev,
244 				  &fdtv_ca, fdtv, DVB_DEVICE_CA, 0);
245 
246 	if (stat.ca_application_info == 0)
247 		dev_err(fdtv->device, "CaApplicationInfo is not set\n");
248 	if (stat.ca_date_time_request == 1)
249 		avc_ca_get_time_date(fdtv, &fdtv->ca_time_interval);
250 
251 	return err;
252 }
253 
254 void fdtv_ca_release(struct firedtv *fdtv)
255 {
256 	dvb_unregister_device(fdtv->cadev);
257 }
258