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
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
|
/*
* PWM Greybus driver.
*
* Copyright 2014 Google Inc.
* Copyright 2014 Linaro Ltd.
*
* Released under the GPLv2 only.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pwm.h>
#include "greybus.h"
#include "gbphy.h"
struct gb_pwm_chip {
struct gb_connection *connection;
u8 pwm_max; /* max pwm number */
struct pwm_chip chip;
struct pwm_chip *pwm;
};
#define pwm_chip_to_gb_pwm_chip(chip) \
container_of(chip, struct gb_pwm_chip, chip)
static int gb_pwm_count_operation(struct gb_pwm_chip *pwmc)
{
struct gb_pwm_count_response response;
int ret;
ret = gb_operation_sync(pwmc->connection, GB_PWM_TYPE_PWM_COUNT,
NULL, 0, &response, sizeof(response));
if (ret)
return ret;
pwmc->pwm_max = response.count;
return 0;
}
static int gb_pwm_activate_operation(struct gb_pwm_chip *pwmc,
u8 which)
{
struct gb_pwm_activate_request request;
if (which > pwmc->pwm_max)
return -EINVAL;
request.which = which;
return gb_operation_sync(pwmc->connection, GB_PWM_TYPE_ACTIVATE,
&request, sizeof(request), NULL, 0);
}
static int gb_pwm_deactivate_operation(struct gb_pwm_chip *pwmc,
u8 which)
{
struct gb_pwm_deactivate_request request;
if (which > pwmc->pwm_max)
return -EINVAL;
request.which = which;
return gb_operation_sync(pwmc->connection, GB_PWM_TYPE_DEACTIVATE,
&request, sizeof(request), NULL, 0);
}
static int gb_pwm_config_operation(struct gb_pwm_chip *pwmc,
u8 which, u32 duty, u32 period)
{
struct gb_pwm_config_request request;
if (which > pwmc->pwm_max)
return -EINVAL;
request.which = which;
request.duty = cpu_to_le32(duty);
request.period = cpu_to_le32(period);
return gb_operation_sync(pwmc->connection, GB_PWM_TYPE_CONFIG,
&request, sizeof(request), NULL, 0);
}
static int gb_pwm_set_polarity_operation(struct gb_pwm_chip *pwmc,
u8 which, u8 polarity)
{
struct gb_pwm_polarity_request request;
if (which > pwmc->pwm_max)
return -EINVAL;
request.which = which;
request.polarity = polarity;
return gb_operation_sync(pwmc->connection, GB_PWM_TYPE_POLARITY,
&request, sizeof(request), NULL, 0);
}
static int gb_pwm_enable_operation(struct gb_pwm_chip *pwmc,
u8 which)
{
struct gb_pwm_enable_request request;
if (which > pwmc->pwm_max)
return -EINVAL;
request.which = which;
return gb_operation_sync(pwmc->connection, GB_PWM_TYPE_ENABLE,
&request, sizeof(request), NULL, 0);
}
static int gb_pwm_disable_operation(struct gb_pwm_chip *pwmc,
u8 which)
{
struct gb_pwm_disable_request request;
if (which > pwmc->pwm_max)
return -EINVAL;
request.which = which;
return gb_operation_sync(pwmc->connection, GB_PWM_TYPE_DISABLE,
&request, sizeof(request), NULL, 0);
}
static int gb_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
return gb_pwm_activate_operation(pwmc, pwm->hwpwm);
};
static void gb_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
if (pwm_is_enabled(pwm))
dev_warn(chip->dev, "freeing PWM device without disabling\n");
gb_pwm_deactivate_operation(pwmc, pwm->hwpwm);
}
static int gb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
{
struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
return gb_pwm_config_operation(pwmc, pwm->hwpwm, duty_ns, period_ns);
};
static int gb_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
enum pwm_polarity polarity)
{
struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
return gb_pwm_set_polarity_operation(pwmc, pwm->hwpwm, polarity);
};
static int gb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
return gb_pwm_enable_operation(pwmc, pwm->hwpwm);
};
static void gb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
gb_pwm_disable_operation(pwmc, pwm->hwpwm);
};
static const struct pwm_ops gb_pwm_ops = {
.request = gb_pwm_request,
.free = gb_pwm_free,
.config = gb_pwm_config,
.set_polarity = gb_pwm_set_polarity,
.enable = gb_pwm_enable,
.disable = gb_pwm_disable,
.owner = THIS_MODULE,
};
static int gb_pwm_probe(struct gbphy_device *gbphy_dev,
const struct gbphy_device_id *id)
{
struct gb_connection *connection;
struct gb_pwm_chip *pwmc;
struct pwm_chip *pwm;
int ret;
pwmc = kzalloc(sizeof(*pwmc), GFP_KERNEL);
if (!pwmc)
return -ENOMEM;
connection = gb_connection_create(gbphy_dev->bundle,
le16_to_cpu(gbphy_dev->cport_desc->id),
NULL);
if (IS_ERR(connection)) {
ret = PTR_ERR(connection);
goto exit_pwmc_free;
}
pwmc->connection = connection;
gb_connection_set_data(connection, pwmc);
gb_gbphy_set_data(gbphy_dev, pwmc);
ret = gb_connection_enable(connection);
if (ret)
goto exit_connection_destroy;
/* Query number of pwms present */
ret = gb_pwm_count_operation(pwmc);
if (ret)
goto exit_connection_disable;
pwm = &pwmc->chip;
pwm->dev = &gbphy_dev->dev;
pwm->ops = &gb_pwm_ops;
pwm->base = -1; /* Allocate base dynamically */
pwm->npwm = pwmc->pwm_max + 1;
pwm->can_sleep = true; /* FIXME */
ret = pwmchip_add(pwm);
if (ret) {
dev_err(&gbphy_dev->dev,
"failed to register PWM: %d\n", ret);
goto exit_connection_disable;
}
return 0;
exit_connection_disable:
gb_connection_disable(connection);
exit_connection_destroy:
gb_connection_destroy(connection);
exit_pwmc_free:
kfree(pwmc);
return ret;
}
static void gb_pwm_remove(struct gbphy_device *gbphy_dev)
{
struct gb_pwm_chip *pwmc = gb_gbphy_get_data(gbphy_dev);
struct gb_connection *connection = pwmc->connection;
pwmchip_remove(&pwmc->chip);
gb_connection_disable(connection);
gb_connection_destroy(connection);
kfree(pwmc);
}
static const struct gbphy_device_id gb_pwm_id_table[] = {
{ GBPHY_PROTOCOL(GREYBUS_PROTOCOL_PWM) },
{ },
};
MODULE_DEVICE_TABLE(gbphy, gb_pwm_id_table);
static struct gbphy_driver pwm_driver = {
.name = "pwm",
.probe = gb_pwm_probe,
.remove = gb_pwm_remove,
.id_table = gb_pwm_id_table,
};
module_gbphy_driver(pwm_driver);
MODULE_LICENSE("GPL v2");
|