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
265
266
267
268
269
270
271
272
273
274
|
// SPDX-License-Identifier: GPL-2.0
/*
* Support for usb functionality of Hikey series boards
* based on Hisilicon Kirin Soc.
*
* Copyright (C) 2017-2018 Hilisicon Electronics Co., Ltd.
* http://www.huawei.com
*
* Authors: Yu Chen <chenyu56@huawei.com>
*/
#include <linux/gpio/consumer.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/usb/role.h>
#define DEVICE_DRIVER_NAME "hisi_hikey_usb"
#define HUB_VBUS_POWER_ON 1
#define HUB_VBUS_POWER_OFF 0
#define USB_SWITCH_TO_HUB 1
#define USB_SWITCH_TO_TYPEC 0
#define TYPEC_VBUS_POWER_ON 1
#define TYPEC_VBUS_POWER_OFF 0
struct hisi_hikey_usb {
struct device *dev;
struct gpio_desc *otg_switch;
struct gpio_desc *typec_vbus;
struct gpio_desc *reset;
struct regulator *regulator;
struct usb_role_switch *hub_role_sw;
struct usb_role_switch *dev_role_sw;
enum usb_role role;
struct mutex lock;
struct work_struct work;
struct notifier_block nb;
};
static void hub_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb, int value)
{
int ret, status;
if (!hisi_hikey_usb->regulator)
return;
status = regulator_is_enabled(hisi_hikey_usb->regulator);
if (status == !!value)
return;
if (value)
ret = regulator_enable(hisi_hikey_usb->regulator);
else
ret = regulator_disable(hisi_hikey_usb->regulator);
if (ret)
dev_err(hisi_hikey_usb->dev,
"Can't switch regulator state to %s\n",
value ? "enabled" : "disabled");
}
static void usb_switch_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
int switch_to)
{
if (!hisi_hikey_usb->otg_switch)
return;
gpiod_set_value_cansleep(hisi_hikey_usb->otg_switch, switch_to);
}
static void usb_typec_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
int value)
{
if (!hisi_hikey_usb->typec_vbus)
return;
gpiod_set_value_cansleep(hisi_hikey_usb->typec_vbus, value);
}
static void relay_set_role_switch(struct work_struct *work)
{
struct hisi_hikey_usb *hisi_hikey_usb = container_of(work,
struct hisi_hikey_usb,
work);
struct usb_role_switch *sw;
enum usb_role role;
if (!hisi_hikey_usb || !hisi_hikey_usb->dev_role_sw)
return;
mutex_lock(&hisi_hikey_usb->lock);
switch (hisi_hikey_usb->role) {
case USB_ROLE_NONE:
usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_OFF);
usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_HUB);
hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_ON);
break;
case USB_ROLE_HOST:
hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_TYPEC);
usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_ON);
break;
case USB_ROLE_DEVICE:
hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_OFF);
usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_TYPEC);
break;
default:
break;
}
sw = hisi_hikey_usb->dev_role_sw;
role = hisi_hikey_usb->role;
mutex_unlock(&hisi_hikey_usb->lock);
usb_role_switch_set_role(sw, role);
}
static int hub_usb_role_switch_set(struct usb_role_switch *sw, enum usb_role role)
{
struct hisi_hikey_usb *hisi_hikey_usb = usb_role_switch_get_drvdata(sw);
if (!hisi_hikey_usb || !hisi_hikey_usb->dev_role_sw)
return -EINVAL;
mutex_lock(&hisi_hikey_usb->lock);
hisi_hikey_usb->role = role;
mutex_unlock(&hisi_hikey_usb->lock);
schedule_work(&hisi_hikey_usb->work);
return 0;
}
static int hisi_hikey_usb_of_role_switch(struct platform_device *pdev,
struct hisi_hikey_usb *hisi_hikey_usb)
{
struct device *dev = &pdev->dev;
struct usb_role_switch_desc hub_role_switch = {NULL};
if (!device_property_read_bool(dev, "usb-role-switch"))
return 0;
hisi_hikey_usb->otg_switch = devm_gpiod_get(dev, "otg-switch",
GPIOD_OUT_HIGH);
if (IS_ERR(hisi_hikey_usb->otg_switch)) {
dev_err(dev, "get otg-switch failed with error %ld\n",
PTR_ERR(hisi_hikey_usb->otg_switch));
return PTR_ERR(hisi_hikey_usb->otg_switch);
}
hisi_hikey_usb->typec_vbus = devm_gpiod_get(dev, "typec-vbus",
GPIOD_OUT_LOW);
if (IS_ERR(hisi_hikey_usb->typec_vbus)) {
dev_err(dev, "get typec-vbus failed with error %ld\n",
PTR_ERR(hisi_hikey_usb->typec_vbus));
return PTR_ERR(hisi_hikey_usb->typec_vbus);
}
hisi_hikey_usb->reset = devm_gpiod_get_optional(dev,
"hub-reset-en",
GPIOD_OUT_HIGH);
if (IS_ERR(hisi_hikey_usb->reset)) {
dev_err(dev, "get hub-reset-en failed with error %ld\n",
PTR_ERR(hisi_hikey_usb->reset));
return PTR_ERR(hisi_hikey_usb->reset);
}
hisi_hikey_usb->dev_role_sw = usb_role_switch_get(dev);
if (!hisi_hikey_usb->dev_role_sw)
return -EPROBE_DEFER;
if (IS_ERR(hisi_hikey_usb->dev_role_sw)) {
dev_err(dev, "get device role switch failed with error %ld\n",
PTR_ERR(hisi_hikey_usb->dev_role_sw));
return PTR_ERR(hisi_hikey_usb->dev_role_sw);
}
INIT_WORK(&hisi_hikey_usb->work, relay_set_role_switch);
hub_role_switch.fwnode = dev_fwnode(dev);
hub_role_switch.set = hub_usb_role_switch_set;
hub_role_switch.driver_data = hisi_hikey_usb;
hisi_hikey_usb->hub_role_sw = usb_role_switch_register(dev,
&hub_role_switch);
if (IS_ERR(hisi_hikey_usb->hub_role_sw)) {
dev_err(dev,
"failed to register hub role with error %ld\n",
PTR_ERR(hisi_hikey_usb->hub_role_sw));
usb_role_switch_put(hisi_hikey_usb->dev_role_sw);
return PTR_ERR(hisi_hikey_usb->hub_role_sw);
}
return 0;
}
static int hisi_hikey_usb_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct hisi_hikey_usb *hisi_hikey_usb;
int ret;
hisi_hikey_usb = devm_kzalloc(dev, sizeof(*hisi_hikey_usb), GFP_KERNEL);
if (!hisi_hikey_usb)
return -ENOMEM;
hisi_hikey_usb->dev = &pdev->dev;
mutex_init(&hisi_hikey_usb->lock);
hisi_hikey_usb->regulator = devm_regulator_get(dev, "hub-vdd");
if (IS_ERR(hisi_hikey_usb->regulator)) {
if (PTR_ERR(hisi_hikey_usb->regulator) == -EPROBE_DEFER) {
dev_info(dev, "waiting for hub-vdd-supply\n");
return PTR_ERR(hisi_hikey_usb->regulator);
}
dev_err(dev, "get hub-vdd-supply failed with error %ld\n",
PTR_ERR(hisi_hikey_usb->regulator));
return PTR_ERR(hisi_hikey_usb->regulator);
}
ret = hisi_hikey_usb_of_role_switch(pdev, hisi_hikey_usb);
if (ret)
return ret;
platform_set_drvdata(pdev, hisi_hikey_usb);
return 0;
}
static void hisi_hikey_usb_remove(struct platform_device *pdev)
{
struct hisi_hikey_usb *hisi_hikey_usb = platform_get_drvdata(pdev);
if (hisi_hikey_usb->hub_role_sw) {
usb_role_switch_unregister(hisi_hikey_usb->hub_role_sw);
if (hisi_hikey_usb->dev_role_sw)
usb_role_switch_put(hisi_hikey_usb->dev_role_sw);
} else {
hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
}
}
static const struct of_device_id id_table_hisi_hikey_usb[] = {
{ .compatible = "hisilicon,usbhub" },
{}
};
MODULE_DEVICE_TABLE(of, id_table_hisi_hikey_usb);
static struct platform_driver hisi_hikey_usb_driver = {
.probe = hisi_hikey_usb_probe,
.remove = hisi_hikey_usb_remove,
.driver = {
.name = DEVICE_DRIVER_NAME,
.of_match_table = id_table_hisi_hikey_usb,
},
};
module_platform_driver(hisi_hikey_usb_driver);
MODULE_AUTHOR("Yu Chen <chenyu56@huawei.com>");
MODULE_DESCRIPTION("Driver Support for USB functionality of Hikey");
MODULE_LICENSE("GPL v2");
|
