1 /*
2 * Copyright 2009 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 "priv.h"
25
26 int
nv_rdaux(struct nvkm_i2c_port * port,u32 addr,u8 * data,u8 size)27 nv_rdaux(struct nvkm_i2c_port *port, u32 addr, u8 *data, u8 size)
28 {
29 struct nvkm_i2c *i2c = nvkm_i2c(port);
30 if (port->func->aux) {
31 int ret = i2c->acquire(port, 0);
32 if (ret == 0) {
33 ret = port->func->aux(port, true, 9, addr, data, size);
34 i2c->release(port);
35 }
36 return ret;
37 }
38 return -ENODEV;
39 }
40
41 int
nv_wraux(struct nvkm_i2c_port * port,u32 addr,u8 * data,u8 size)42 nv_wraux(struct nvkm_i2c_port *port, u32 addr, u8 *data, u8 size)
43 {
44 struct nvkm_i2c *i2c = nvkm_i2c(port);
45 if (port->func->aux) {
46 int ret = i2c->acquire(port, 0);
47 if (ret == 0) {
48 ret = port->func->aux(port, true, 8, addr, data, size);
49 i2c->release(port);
50 }
51 return ret;
52 }
53 return -ENODEV;
54 }
55
56 static int
aux_xfer(struct i2c_adapter * adap,struct i2c_msg * msgs,int num)57 aux_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
58 {
59 struct nvkm_i2c_port *port = adap->algo_data;
60 struct nvkm_i2c *i2c = nvkm_i2c(port);
61 struct i2c_msg *msg = msgs;
62 int ret, mcnt = num;
63
64 if (!port->func->aux)
65 return -ENODEV;
66
67 ret = i2c->acquire(port, 0);
68 if (ret)
69 return ret;
70
71 while (mcnt--) {
72 u8 remaining = msg->len;
73 u8 *ptr = msg->buf;
74
75 while (remaining) {
76 u8 cnt = (remaining > 16) ? 16 : remaining;
77 u8 cmd;
78
79 if (msg->flags & I2C_M_RD)
80 cmd = 1;
81 else
82 cmd = 0;
83
84 if (mcnt || remaining > 16)
85 cmd |= 4; /* MOT */
86
87 ret = port->func->aux(port, true, cmd, msg->addr, ptr, cnt);
88 if (ret < 0) {
89 i2c->release(port);
90 return ret;
91 }
92
93 ptr += cnt;
94 remaining -= cnt;
95 }
96
97 msg++;
98 }
99
100 i2c->release(port);
101 return num;
102 }
103
104 static u32
aux_func(struct i2c_adapter * adap)105 aux_func(struct i2c_adapter *adap)
106 {
107 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
108 }
109
110 const struct i2c_algorithm nvkm_i2c_aux_algo = {
111 .master_xfer = aux_xfer,
112 .functionality = aux_func
113 };
114