[media] platform: vivid: Use cec_get_drvdata()
[sfrench/cifs-2.6.git] / drivers / media / platform / vivid / vivid-cec.c
1 /*
2  * vivid-cec.c - A Virtual Video Test Driver, cec emulation
3  *
4  * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
5  *
6  * This program is free software; you may redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; version 2 of the License.
9  *
10  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
11  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
12  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
13  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
14  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
15  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
16  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
17  * SOFTWARE.
18  */
19
20 #include <media/cec.h>
21
22 #include "vivid-core.h"
23 #include "vivid-cec.h"
24
25 void vivid_cec_bus_free_work(struct vivid_dev *dev)
26 {
27         spin_lock(&dev->cec_slock);
28         while (!list_empty(&dev->cec_work_list)) {
29                 struct vivid_cec_work *cw =
30                         list_first_entry(&dev->cec_work_list,
31                                          struct vivid_cec_work, list);
32
33                 spin_unlock(&dev->cec_slock);
34                 cancel_delayed_work_sync(&cw->work);
35                 spin_lock(&dev->cec_slock);
36                 list_del(&cw->list);
37                 cec_transmit_done(cw->adap, CEC_TX_STATUS_LOW_DRIVE, 0, 0, 1, 0);
38                 kfree(cw);
39         }
40         spin_unlock(&dev->cec_slock);
41 }
42
43 static bool vivid_cec_find_dest_adap(struct vivid_dev *dev,
44                                      struct cec_adapter *adap, u8 dest)
45 {
46         unsigned int i;
47
48         if (dest >= 0xf)
49                 return false;
50
51         if (adap != dev->cec_rx_adap && dev->cec_rx_adap &&
52             dev->cec_rx_adap->is_configured &&
53             cec_has_log_addr(dev->cec_rx_adap, dest))
54                 return true;
55
56         for (i = 0; i < MAX_OUTPUTS && dev->cec_tx_adap[i]; i++) {
57                 if (adap == dev->cec_tx_adap[i])
58                         continue;
59                 if (!dev->cec_tx_adap[i]->is_configured)
60                         continue;
61                 if (cec_has_log_addr(dev->cec_tx_adap[i], dest))
62                         return true;
63         }
64         return false;
65 }
66
67 static void vivid_cec_xfer_done_worker(struct work_struct *work)
68 {
69         struct vivid_cec_work *cw =
70                 container_of(work, struct vivid_cec_work, work.work);
71         struct vivid_dev *dev = cw->dev;
72         struct cec_adapter *adap = cw->adap;
73         u8 dest = cec_msg_destination(&cw->msg);
74         bool valid_dest;
75         unsigned int i;
76
77         valid_dest = cec_msg_is_broadcast(&cw->msg);
78         if (!valid_dest)
79                 valid_dest = vivid_cec_find_dest_adap(dev, adap, dest);
80
81         cw->tx_status = valid_dest ? CEC_TX_STATUS_OK : CEC_TX_STATUS_NACK;
82         spin_lock(&dev->cec_slock);
83         dev->cec_xfer_time_jiffies = 0;
84         dev->cec_xfer_start_jiffies = 0;
85         list_del(&cw->list);
86         spin_unlock(&dev->cec_slock);
87         cec_transmit_done(cw->adap, cw->tx_status, 0, valid_dest ? 0 : 1, 0, 0);
88
89         /* Broadcast message */
90         if (adap != dev->cec_rx_adap)
91                 cec_received_msg(dev->cec_rx_adap, &cw->msg);
92         for (i = 0; i < MAX_OUTPUTS && dev->cec_tx_adap[i]; i++)
93                 if (adap != dev->cec_tx_adap[i])
94                         cec_received_msg(dev->cec_tx_adap[i], &cw->msg);
95         kfree(cw);
96 }
97
98 static void vivid_cec_xfer_try_worker(struct work_struct *work)
99 {
100         struct vivid_cec_work *cw =
101                 container_of(work, struct vivid_cec_work, work.work);
102         struct vivid_dev *dev = cw->dev;
103
104         spin_lock(&dev->cec_slock);
105         if (dev->cec_xfer_time_jiffies) {
106                 list_del(&cw->list);
107                 spin_unlock(&dev->cec_slock);
108                 cec_transmit_done(cw->adap, CEC_TX_STATUS_ARB_LOST, 1, 0, 0, 0);
109                 kfree(cw);
110         } else {
111                 INIT_DELAYED_WORK(&cw->work, vivid_cec_xfer_done_worker);
112                 dev->cec_xfer_start_jiffies = jiffies;
113                 dev->cec_xfer_time_jiffies = usecs_to_jiffies(cw->usecs);
114                 spin_unlock(&dev->cec_slock);
115                 schedule_delayed_work(&cw->work, dev->cec_xfer_time_jiffies);
116         }
117 }
118
119 static int vivid_cec_adap_enable(struct cec_adapter *adap, bool enable)
120 {
121         return 0;
122 }
123
124 static int vivid_cec_adap_log_addr(struct cec_adapter *adap, u8 log_addr)
125 {
126         return 0;
127 }
128
129 /*
130  * One data bit takes 2400 us, each byte needs 10 bits so that's 24000 us
131  * per byte.
132  */
133 #define USECS_PER_BYTE 24000
134
135 static int vivid_cec_adap_transmit(struct cec_adapter *adap, u8 attempts,
136                                    u32 signal_free_time, struct cec_msg *msg)
137 {
138         struct vivid_dev *dev = cec_get_drvdata(adap);
139         struct vivid_cec_work *cw = kzalloc(sizeof(*cw), GFP_KERNEL);
140         long delta_jiffies = 0;
141
142         if (cw == NULL)
143                 return -ENOMEM;
144         cw->dev = dev;
145         cw->adap = adap;
146         cw->usecs = CEC_FREE_TIME_TO_USEC(signal_free_time) +
147                     msg->len * USECS_PER_BYTE;
148         cw->msg = *msg;
149
150         spin_lock(&dev->cec_slock);
151         list_add(&cw->list, &dev->cec_work_list);
152         if (dev->cec_xfer_time_jiffies == 0) {
153                 INIT_DELAYED_WORK(&cw->work, vivid_cec_xfer_done_worker);
154                 dev->cec_xfer_start_jiffies = jiffies;
155                 dev->cec_xfer_time_jiffies = usecs_to_jiffies(cw->usecs);
156                 delta_jiffies = dev->cec_xfer_time_jiffies;
157         } else {
158                 INIT_DELAYED_WORK(&cw->work, vivid_cec_xfer_try_worker);
159                 delta_jiffies = dev->cec_xfer_start_jiffies +
160                         dev->cec_xfer_time_jiffies - jiffies;
161         }
162         spin_unlock(&dev->cec_slock);
163         schedule_delayed_work(&cw->work, delta_jiffies < 0 ? 0 : delta_jiffies);
164         return 0;
165 }
166
167 static int vivid_received(struct cec_adapter *adap, struct cec_msg *msg)
168 {
169         struct vivid_dev *dev = cec_get_drvdata(adap);
170         struct cec_msg reply;
171         u8 dest = cec_msg_destination(msg);
172         u8 disp_ctl;
173         char osd[14];
174
175         if (cec_msg_is_broadcast(msg))
176                 dest = adap->log_addrs.log_addr[0];
177         cec_msg_init(&reply, dest, cec_msg_initiator(msg));
178
179         switch (cec_msg_opcode(msg)) {
180         case CEC_MSG_SET_OSD_STRING:
181                 if (!cec_is_sink(adap))
182                         return -ENOMSG;
183                 cec_ops_set_osd_string(msg, &disp_ctl, osd);
184                 switch (disp_ctl) {
185                 case CEC_OP_DISP_CTL_DEFAULT:
186                         strcpy(dev->osd, osd);
187                         dev->osd_jiffies = jiffies;
188                         break;
189                 case CEC_OP_DISP_CTL_UNTIL_CLEARED:
190                         strcpy(dev->osd, osd);
191                         dev->osd_jiffies = 0;
192                         break;
193                 case CEC_OP_DISP_CTL_CLEAR:
194                         dev->osd[0] = 0;
195                         dev->osd_jiffies = 0;
196                         break;
197                 default:
198                         cec_msg_feature_abort(&reply, cec_msg_opcode(msg),
199                                               CEC_OP_ABORT_INVALID_OP);
200                         cec_transmit_msg(adap, &reply, false);
201                         break;
202                 }
203                 break;
204         default:
205                 return -ENOMSG;
206         }
207         return 0;
208 }
209
210 static const struct cec_adap_ops vivid_cec_adap_ops = {
211         .adap_enable = vivid_cec_adap_enable,
212         .adap_log_addr = vivid_cec_adap_log_addr,
213         .adap_transmit = vivid_cec_adap_transmit,
214         .received = vivid_received,
215 };
216
217 struct cec_adapter *vivid_cec_alloc_adap(struct vivid_dev *dev,
218                                          unsigned int idx,
219                                          bool is_source)
220 {
221         char name[sizeof(dev->vid_out_dev.name) + 2];
222         u32 caps = CEC_CAP_TRANSMIT | CEC_CAP_LOG_ADDRS |
223                 CEC_CAP_PASSTHROUGH | CEC_CAP_RC | CEC_CAP_MONITOR_ALL;
224
225         snprintf(name, sizeof(name), "%s%d",
226                  is_source ? dev->vid_out_dev.name : dev->vid_cap_dev.name,
227                  idx);
228         return cec_allocate_adapter(&vivid_cec_adap_ops, dev,
229                 name, caps, 1);
230 }