1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Support for usb functionality of Hikey series boards
4 * based on Hisilicon Kirin Soc.
5 *
6 * Copyright (C) 2017-2018 Hilisicon Electronics Co., Ltd.
7 * http://www.huawei.com
8 *
9 * Authors: Yu Chen <chenyu56@huawei.com>
10 */
11
12 #include <linux/gpio/consumer.h>
13 #include <linux/kernel.h>
14 #include <linux/mod_devicetable.h>
15 #include <linux/module.h>
16 #include <linux/notifier.h>
17 #include <linux/of_gpio.h>
18 #include <linux/platform_device.h>
19 #include <linux/property.h>
20 #include <linux/regulator/consumer.h>
21 #include <linux/slab.h>
22 #include <linux/usb/role.h>
23
24 #define DEVICE_DRIVER_NAME "hisi_hikey_usb"
25
26 #define HUB_VBUS_POWER_ON 1
27 #define HUB_VBUS_POWER_OFF 0
28 #define USB_SWITCH_TO_HUB 1
29 #define USB_SWITCH_TO_TYPEC 0
30 #define TYPEC_VBUS_POWER_ON 1
31 #define TYPEC_VBUS_POWER_OFF 0
32
33 struct hisi_hikey_usb {
34 struct device *dev;
35 struct gpio_desc *otg_switch;
36 struct gpio_desc *typec_vbus;
37 struct gpio_desc *reset;
38
39 struct regulator *regulator;
40
41 struct usb_role_switch *hub_role_sw;
42
43 struct usb_role_switch *dev_role_sw;
44 enum usb_role role;
45
46 struct mutex lock;
47 struct work_struct work;
48
49 struct notifier_block nb;
50 };
51
hub_power_ctrl(struct hisi_hikey_usb * hisi_hikey_usb,int value)52 static void hub_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb, int value)
53 {
54 int ret, status;
55
56 if (!hisi_hikey_usb->regulator)
57 return;
58
59 status = regulator_is_enabled(hisi_hikey_usb->regulator);
60 if (status == !!value)
61 return;
62
63 if (value)
64 ret = regulator_enable(hisi_hikey_usb->regulator);
65 else
66 ret = regulator_disable(hisi_hikey_usb->regulator);
67
68 if (ret)
69 dev_err(hisi_hikey_usb->dev,
70 "Can't switch regulator state to %s\n",
71 value ? "enabled" : "disabled");
72 }
73
usb_switch_ctrl(struct hisi_hikey_usb * hisi_hikey_usb,int switch_to)74 static void usb_switch_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
75 int switch_to)
76 {
77 if (!hisi_hikey_usb->otg_switch)
78 return;
79
80 gpiod_set_value_cansleep(hisi_hikey_usb->otg_switch, switch_to);
81 }
82
usb_typec_power_ctrl(struct hisi_hikey_usb * hisi_hikey_usb,int value)83 static void usb_typec_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
84 int value)
85 {
86 if (!hisi_hikey_usb->typec_vbus)
87 return;
88
89 gpiod_set_value_cansleep(hisi_hikey_usb->typec_vbus, value);
90 }
91
relay_set_role_switch(struct work_struct * work)92 static void relay_set_role_switch(struct work_struct *work)
93 {
94 struct hisi_hikey_usb *hisi_hikey_usb = container_of(work,
95 struct hisi_hikey_usb,
96 work);
97 struct usb_role_switch *sw;
98 enum usb_role role;
99
100 if (!hisi_hikey_usb || !hisi_hikey_usb->dev_role_sw)
101 return;
102
103 mutex_lock(&hisi_hikey_usb->lock);
104 switch (hisi_hikey_usb->role) {
105 case USB_ROLE_NONE:
106 usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_OFF);
107 usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_HUB);
108 hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_ON);
109 break;
110 case USB_ROLE_HOST:
111 hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
112 usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_TYPEC);
113 usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_ON);
114 break;
115 case USB_ROLE_DEVICE:
116 hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
117 usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_OFF);
118 usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_TYPEC);
119 break;
120 default:
121 break;
122 }
123 sw = hisi_hikey_usb->dev_role_sw;
124 role = hisi_hikey_usb->role;
125 mutex_unlock(&hisi_hikey_usb->lock);
126
127 usb_role_switch_set_role(sw, role);
128 }
129
hub_usb_role_switch_set(struct usb_role_switch * sw,enum usb_role role)130 static int hub_usb_role_switch_set(struct usb_role_switch *sw, enum usb_role role)
131 {
132 struct hisi_hikey_usb *hisi_hikey_usb = usb_role_switch_get_drvdata(sw);
133
134 if (!hisi_hikey_usb || !hisi_hikey_usb->dev_role_sw)
135 return -EINVAL;
136
137 mutex_lock(&hisi_hikey_usb->lock);
138 hisi_hikey_usb->role = role;
139 mutex_unlock(&hisi_hikey_usb->lock);
140
141 schedule_work(&hisi_hikey_usb->work);
142
143 return 0;
144 }
145
hisi_hikey_usb_of_role_switch(struct platform_device * pdev,struct hisi_hikey_usb * hisi_hikey_usb)146 static int hisi_hikey_usb_of_role_switch(struct platform_device *pdev,
147 struct hisi_hikey_usb *hisi_hikey_usb)
148 {
149 struct device *dev = &pdev->dev;
150 struct usb_role_switch_desc hub_role_switch = {NULL};
151
152 if (!device_property_read_bool(dev, "usb-role-switch"))
153 return 0;
154
155 hisi_hikey_usb->otg_switch = devm_gpiod_get(dev, "otg-switch",
156 GPIOD_OUT_HIGH);
157 if (IS_ERR(hisi_hikey_usb->otg_switch)) {
158 dev_err(dev, "get otg-switch failed with error %ld\n",
159 PTR_ERR(hisi_hikey_usb->otg_switch));
160 return PTR_ERR(hisi_hikey_usb->otg_switch);
161 }
162
163 hisi_hikey_usb->typec_vbus = devm_gpiod_get(dev, "typec-vbus",
164 GPIOD_OUT_LOW);
165 if (IS_ERR(hisi_hikey_usb->typec_vbus)) {
166 dev_err(dev, "get typec-vbus failed with error %ld\n",
167 PTR_ERR(hisi_hikey_usb->typec_vbus));
168 return PTR_ERR(hisi_hikey_usb->typec_vbus);
169 }
170
171 hisi_hikey_usb->reset = devm_gpiod_get_optional(dev,
172 "hub-reset-en",
173 GPIOD_OUT_HIGH);
174 if (IS_ERR(hisi_hikey_usb->reset)) {
175 dev_err(dev, "get hub-reset-en failed with error %ld\n",
176 PTR_ERR(hisi_hikey_usb->reset));
177 return PTR_ERR(hisi_hikey_usb->reset);
178 }
179
180 hisi_hikey_usb->dev_role_sw = usb_role_switch_get(dev);
181 if (!hisi_hikey_usb->dev_role_sw)
182 return -EPROBE_DEFER;
183 if (IS_ERR(hisi_hikey_usb->dev_role_sw)) {
184 dev_err(dev, "get device role switch failed with error %ld\n",
185 PTR_ERR(hisi_hikey_usb->dev_role_sw));
186 return PTR_ERR(hisi_hikey_usb->dev_role_sw);
187 }
188
189 INIT_WORK(&hisi_hikey_usb->work, relay_set_role_switch);
190
191 hub_role_switch.fwnode = dev_fwnode(dev);
192 hub_role_switch.set = hub_usb_role_switch_set;
193 hub_role_switch.driver_data = hisi_hikey_usb;
194
195 hisi_hikey_usb->hub_role_sw = usb_role_switch_register(dev,
196 &hub_role_switch);
197
198 if (IS_ERR(hisi_hikey_usb->hub_role_sw)) {
199 dev_err(dev,
200 "failed to register hub role with error %ld\n",
201 PTR_ERR(hisi_hikey_usb->hub_role_sw));
202 usb_role_switch_put(hisi_hikey_usb->dev_role_sw);
203 return PTR_ERR(hisi_hikey_usb->hub_role_sw);
204 }
205
206 return 0;
207 }
208
hisi_hikey_usb_probe(struct platform_device * pdev)209 static int hisi_hikey_usb_probe(struct platform_device *pdev)
210 {
211 struct device *dev = &pdev->dev;
212 struct hisi_hikey_usb *hisi_hikey_usb;
213 int ret;
214
215 hisi_hikey_usb = devm_kzalloc(dev, sizeof(*hisi_hikey_usb), GFP_KERNEL);
216 if (!hisi_hikey_usb)
217 return -ENOMEM;
218
219 hisi_hikey_usb->dev = &pdev->dev;
220 mutex_init(&hisi_hikey_usb->lock);
221
222 hisi_hikey_usb->regulator = devm_regulator_get(dev, "hub-vdd");
223 if (IS_ERR(hisi_hikey_usb->regulator)) {
224 if (PTR_ERR(hisi_hikey_usb->regulator) == -EPROBE_DEFER) {
225 dev_info(dev, "waiting for hub-vdd-supply\n");
226 return PTR_ERR(hisi_hikey_usb->regulator);
227 }
228 dev_err(dev, "get hub-vdd-supply failed with error %ld\n",
229 PTR_ERR(hisi_hikey_usb->regulator));
230 return PTR_ERR(hisi_hikey_usb->regulator);
231 }
232
233 ret = hisi_hikey_usb_of_role_switch(pdev, hisi_hikey_usb);
234 if (ret)
235 return ret;
236
237 platform_set_drvdata(pdev, hisi_hikey_usb);
238
239 return 0;
240 }
241
hisi_hikey_usb_remove(struct platform_device * pdev)242 static int hisi_hikey_usb_remove(struct platform_device *pdev)
243 {
244 struct hisi_hikey_usb *hisi_hikey_usb = platform_get_drvdata(pdev);
245
246 if (hisi_hikey_usb->hub_role_sw) {
247 usb_role_switch_unregister(hisi_hikey_usb->hub_role_sw);
248
249 if (hisi_hikey_usb->dev_role_sw)
250 usb_role_switch_put(hisi_hikey_usb->dev_role_sw);
251 } else {
252 hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
253 }
254
255 return 0;
256 }
257
258 static const struct of_device_id id_table_hisi_hikey_usb[] = {
259 { .compatible = "hisilicon,usbhub" },
260 {}
261 };
262 MODULE_DEVICE_TABLE(of, id_table_hisi_hikey_usb);
263
264 static struct platform_driver hisi_hikey_usb_driver = {
265 .probe = hisi_hikey_usb_probe,
266 .remove = hisi_hikey_usb_remove,
267 .driver = {
268 .name = DEVICE_DRIVER_NAME,
269 .of_match_table = id_table_hisi_hikey_usb,
270 },
271 };
272
273 module_platform_driver(hisi_hikey_usb_driver);
274
275 MODULE_AUTHOR("Yu Chen <chenyu56@huawei.com>");
276 MODULE_DESCRIPTION("Driver Support for USB functionality of Hikey");
277 MODULE_LICENSE("GPL v2");
278
