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
25 #include "priv.h"
26
27 int
nv_rdaux(struct nouveau_i2c_port * port,u32 addr,u8 * data,u8 size)28 nv_rdaux(struct nouveau_i2c_port *port, u32 addr, u8 *data, u8 size)
29 {
30 struct nouveau_i2c *i2c = nouveau_i2c(port);
31 if (port->func->aux) {
32 int ret = i2c->acquire(port, 0);
33 if (ret == 0) {
34 ret = port->func->aux(port, true, 9, addr, data, size);
35 i2c->release(port);
36 }
37 return ret;
38 }
39 return -ENODEV;
40 }
41
42 int
nv_wraux(struct nouveau_i2c_port * port,u32 addr,u8 * data,u8 size)43 nv_wraux(struct nouveau_i2c_port *port, u32 addr, u8 *data, u8 size)
44 {
45 struct nouveau_i2c *i2c = nouveau_i2c(port);
46 if (port->func->aux) {
47 int ret = i2c->acquire(port, 0);
48 if (ret == 0) {
49 ret = port->func->aux(port, true, 8, addr, data, size);
50 i2c->release(port);
51 }
52 return ret;
53 }
54 return -ENODEV;
55 }
56
57 static int
aux_xfer(struct i2c_adapter * adap,struct i2c_msg * msgs,int num)58 aux_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
59 {
60 struct nouveau_i2c_port *port = adap->algo_data;
61 struct nouveau_i2c *i2c = nouveau_i2c(port);
62 struct i2c_msg *msg = msgs;
63 int ret, mcnt = num;
64
65 if (!port->func->aux)
66 return -ENODEV;
67
68 ret = i2c->acquire(port, 0);
69 if (ret)
70 return ret;
71
72 while (mcnt--) {
73 u8 remaining = msg->len;
74 u8 *ptr = msg->buf;
75
76 while (remaining) {
77 u8 cnt = (remaining > 16) ? 16 : remaining;
78 u8 cmd;
79
80 if (msg->flags & I2C_M_RD)
81 cmd = 1;
82 else
83 cmd = 0;
84
85 if (mcnt || remaining > 16)
86 cmd |= 4; /* MOT */
87
88 ret = port->func->aux(port, true, cmd, msg->addr, ptr, cnt);
89 if (ret < 0) {
90 i2c->release(port);
91 return ret;
92 }
93
94 ptr += cnt;
95 remaining -= cnt;
96 }
97
98 msg++;
99 }
100
101 i2c->release(port);
102 return num;
103 }
104
105 static u32
aux_func(struct i2c_adapter * adap)106 aux_func(struct i2c_adapter *adap)
107 {
108 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
109 }
110
111 const struct i2c_algorithm nouveau_i2c_aux_algo = {
112 .master_xfer = aux_xfer,
113 .functionality = aux_func
114 };
115