1 | /* $NetBSD: nouveau_subdev_i2c_aux.c,v 1.1.1.1 2014/08/06 12:36:30 riastradh Exp $ */ |
2 | |
3 | /* |
4 | * Copyright 2009 Red Hat Inc. |
5 | * |
6 | * Permission is hereby granted, free of charge, to any person obtaining a |
7 | * copy of this software and associated documentation files (the "Software"), |
8 | * to deal in the Software without restriction, including without limitation |
9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
10 | * and/or sell copies of the Software, and to permit persons to whom the |
11 | * Software is furnished to do so, subject to the following conditions: |
12 | * |
13 | * The above copyright notice and this permission notice shall be included in |
14 | * all copies or substantial portions of the Software. |
15 | * |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
19 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
20 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
21 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
22 | * OTHER DEALINGS IN THE SOFTWARE. |
23 | * |
24 | * Authors: Ben Skeggs |
25 | */ |
26 | |
27 | #include <sys/cdefs.h> |
28 | __KERNEL_RCSID(0, "$NetBSD: nouveau_subdev_i2c_aux.c,v 1.1.1.1 2014/08/06 12:36:30 riastradh Exp $" ); |
29 | |
30 | #include <subdev/i2c.h> |
31 | |
32 | int |
33 | nv_rdaux(struct nouveau_i2c_port *port, u32 addr, u8 *data, u8 size) |
34 | { |
35 | if (port->func->aux) { |
36 | if (port->func->acquire) |
37 | port->func->acquire(port); |
38 | return port->func->aux(port, 9, addr, data, size); |
39 | } |
40 | return -ENODEV; |
41 | } |
42 | |
43 | int |
44 | nv_wraux(struct nouveau_i2c_port *port, u32 addr, u8 *data, u8 size) |
45 | { |
46 | if (port->func->aux) { |
47 | if (port->func->acquire) |
48 | port->func->acquire(port); |
49 | return port->func->aux(port, 8, addr, data, size); |
50 | } |
51 | return -ENODEV; |
52 | } |
53 | |
54 | static int |
55 | aux_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) |
56 | { |
57 | struct nouveau_i2c_port *port = adap->algo_data; |
58 | struct i2c_msg *msg = msgs; |
59 | int ret, mcnt = num; |
60 | |
61 | if (!port->func->aux) |
62 | return -ENODEV; |
63 | if ( port->func->acquire) |
64 | port->func->acquire(port); |
65 | |
66 | while (mcnt--) { |
67 | u8 remaining = msg->len; |
68 | u8 *ptr = msg->buf; |
69 | |
70 | while (remaining) { |
71 | u8 cnt = (remaining > 16) ? 16 : remaining; |
72 | u8 cmd; |
73 | |
74 | if (msg->flags & I2C_M_RD) |
75 | cmd = 1; |
76 | else |
77 | cmd = 0; |
78 | |
79 | if (mcnt || remaining > 16) |
80 | cmd |= 4; /* MOT */ |
81 | |
82 | ret = port->func->aux(port, cmd, msg->addr, ptr, cnt); |
83 | if (ret < 0) |
84 | return ret; |
85 | |
86 | ptr += cnt; |
87 | remaining -= cnt; |
88 | } |
89 | |
90 | msg++; |
91 | } |
92 | |
93 | return num; |
94 | } |
95 | |
96 | static u32 |
97 | aux_func(struct i2c_adapter *adap) |
98 | { |
99 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; |
100 | } |
101 | |
102 | const struct i2c_algorithm nouveau_i2c_aux_algo = { |
103 | .master_xfer = aux_xfer, |
104 | .functionality = aux_func |
105 | }; |
106 | |