1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/*
* Copyright 2009 Red Hat Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: Ben Skeggs
*/
#include <linux/string_helpers.h>
#include "aux.h"
#include "pad.h"
static int
nvkm_i2c_aux_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
{
struct nvkm_i2c_aux *aux = container_of(adap, typeof(*aux), i2c);
struct i2c_msg *msg = msgs;
int ret, mcnt = num;
ret = nvkm_i2c_aux_acquire(aux);
if (ret)
return ret;
while (mcnt--) {
u8 remaining = msg->len;
u8 *ptr = msg->buf;
while (remaining) {
u8 cnt, retries, cmd;
if (msg->flags & I2C_M_RD)
cmd = 1;
else
cmd = 0;
if (mcnt || remaining > 16)
cmd |= 4; /* MOT */
for (retries = 0, cnt = 0;
retries < 32 && !cnt;
retries++) {
cnt = min_t(u8, remaining, 16);
ret = aux->func->xfer(aux, true, cmd,
msg->addr, ptr, &cnt);
if (ret < 0)
goto out;
}
if (!cnt) {
AUX_TRACE(aux, "no data after 32 retries");
ret = -EIO;
goto out;
}
ptr += cnt;
remaining -= cnt;
}
msg++;
}
ret = num;
out:
nvkm_i2c_aux_release(aux);
return ret;
}
static u32
nvkm_i2c_aux_i2c_func(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
}
static const struct i2c_algorithm
nvkm_i2c_aux_i2c_algo = {
.master_xfer = nvkm_i2c_aux_i2c_xfer,
.functionality = nvkm_i2c_aux_i2c_func
};
void
nvkm_i2c_aux_monitor(struct nvkm_i2c_aux *aux, bool monitor)
{
struct nvkm_i2c_pad *pad = aux->pad;
AUX_TRACE(aux, "monitor: %s", str_yes_no(monitor));
if (monitor)
nvkm_i2c_pad_mode(pad, NVKM_I2C_PAD_AUX);
else
nvkm_i2c_pad_mode(pad, NVKM_I2C_PAD_OFF);
}
void
nvkm_i2c_aux_release(struct nvkm_i2c_aux *aux)
{
struct nvkm_i2c_pad *pad = aux->pad;
AUX_TRACE(aux, "release");
nvkm_i2c_pad_release(pad);
mutex_unlock(&aux->mutex);
}
int
nvkm_i2c_aux_acquire(struct nvkm_i2c_aux *aux)
{
struct nvkm_i2c_pad *pad = aux->pad;
int ret;
AUX_TRACE(aux, "acquire");
mutex_lock(&aux->mutex);
if (aux->enabled)
ret = nvkm_i2c_pad_acquire(pad, NVKM_I2C_PAD_AUX);
else
ret = -EIO;
if (ret)
mutex_unlock(&aux->mutex);
return ret;
}
int
nvkm_i2c_aux_xfer(struct nvkm_i2c_aux *aux, bool retry, u8 type,
u32 addr, u8 *data, u8 *size)
{
if (!*size && !aux->func->address_only) {
AUX_ERR(aux, "address-only transaction dropped");
return -ENOSYS;
}
return aux->func->xfer(aux, retry, type, addr, data, size);
}
int
nvkm_i2c_aux_lnk_ctl(struct nvkm_i2c_aux *aux, int nr, int bw, bool ef)
{
if (aux->func->lnk_ctl)
return aux->func->lnk_ctl(aux, nr, bw, ef);
return -ENODEV;
}
void
nvkm_i2c_aux_del(struct nvkm_i2c_aux **paux)
{
struct nvkm_i2c_aux *aux = *paux;
if (aux && !WARN_ON(!aux->func)) {
AUX_TRACE(aux, "dtor");
list_del(&aux->head);
i2c_del_adapter(&aux->i2c);
kfree(*paux);
*paux = NULL;
}
}
void
nvkm_i2c_aux_init(struct nvkm_i2c_aux *aux)
{
AUX_TRACE(aux, "init");
mutex_lock(&aux->mutex);
aux->enabled = true;
mutex_unlock(&aux->mutex);
}
void
nvkm_i2c_aux_fini(struct nvkm_i2c_aux *aux)
{
AUX_TRACE(aux, "fini");
mutex_lock(&aux->mutex);
aux->enabled = false;
mutex_unlock(&aux->mutex);
}
int
nvkm_i2c_aux_ctor(const struct nvkm_i2c_aux_func *func,
struct nvkm_i2c_pad *pad, int id,
struct nvkm_i2c_aux *aux)
{
struct nvkm_device *device = pad->i2c->subdev.device;
aux->func = func;
aux->pad = pad;
aux->id = id;
mutex_init(&aux->mutex);
list_add_tail(&aux->head, &pad->i2c->aux);
AUX_TRACE(aux, "ctor");
snprintf(aux->i2c.name, sizeof(aux->i2c.name), "nvkm-%s-aux-%04x",
dev_name(device->dev), id);
aux->i2c.owner = THIS_MODULE;
aux->i2c.dev.parent = device->dev;
aux->i2c.algo = &nvkm_i2c_aux_i2c_algo;
return i2c_add_adapter(&aux->i2c);
}
int
nvkm_i2c_aux_new_(const struct nvkm_i2c_aux_func *func,
struct nvkm_i2c_pad *pad, int id,
struct nvkm_i2c_aux **paux)
{
if (!(*paux = kzalloc(sizeof(**paux), GFP_KERNEL)))
return -ENOMEM;
return nvkm_i2c_aux_ctor(func, pad, id, *paux);
}
|
