1 /*
2  * Copyright 2014 Red Hat Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  * Authors: Ben Skeggs
23  */
24 #include "conn.h"
25 #include "outp.h"
26 #include "priv.h"
27 
28 #include <subdev/gpio.h>
29 
30 #include <nvif/event.h>
31 
32 void
33 nvkm_conn_fini(struct nvkm_conn *conn)
34 {
35 }
36 
37 void
38 nvkm_conn_init(struct nvkm_conn *conn)
39 {
40 }
41 
42 void
43 nvkm_conn_del(struct nvkm_conn **pconn)
44 {
45 	struct nvkm_conn *conn = *pconn;
46 	if (conn) {
47 		kfree(*pconn);
48 		*pconn = NULL;
49 	}
50 }
51 
52 static void
53 nvkm_conn_ctor(struct nvkm_disp *disp, int index, struct nvbios_connE *info,
54 	       struct nvkm_conn *conn)
55 {
56 	static const u8 hpd[] = { 0x07, 0x08, 0x51, 0x52, 0x5e, 0x5f, 0x60 };
57 	struct nvkm_gpio *gpio = disp->engine.subdev.device->gpio;
58 	struct dcb_gpio_func func;
59 	int ret;
60 
61 	conn->disp = disp;
62 	conn->index = index;
63 	conn->info = *info;
64 	conn->info.hpd = DCB_GPIO_UNUSED;
65 
66 	CONN_DBG(conn, "type %02x loc %d hpd %02x dp %x di %x sr %x lcdid %x",
67 		 info->type, info->location, info->hpd, info->dp,
68 		 info->di, info->sr, info->lcdid);
69 
70 	if ((info->hpd = ffs(info->hpd))) {
71 		if (--info->hpd >= ARRAY_SIZE(hpd)) {
72 			CONN_ERR(conn, "hpd %02x unknown", info->hpd);
73 			return;
74 		}
75 		info->hpd = hpd[info->hpd];
76 
77 		ret = nvkm_gpio_find(gpio, 0, info->hpd, DCB_GPIO_UNUSED, &func);
78 		if (ret) {
79 			CONN_ERR(conn, "func %02x lookup failed, %d", info->hpd, ret);
80 			return;
81 		}
82 
83 		conn->info.hpd = func.line;
84 	}
85 }
86 
87 int
88 nvkm_conn_new(struct nvkm_disp *disp, int index, struct nvbios_connE *info,
89 	      struct nvkm_conn **pconn)
90 {
91 	if (!(*pconn = kzalloc(sizeof(**pconn), GFP_KERNEL)))
92 		return -ENOMEM;
93 	nvkm_conn_ctor(disp, index, info, *pconn);
94 	return 0;
95 }
96