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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * mtu3_dr.c - dual role switch and host glue layer
4 *
5 * Copyright (C) 2016 MediaTek Inc.
6 *
7 * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
8 */
9
10#include "mtu3.h"
11#include "mtu3_dr.h"
12#include "mtu3_debug.h"
13
14#define USB2_PORT 2
15#define USB3_PORT 3
16
17static inline struct ssusb_mtk *otg_sx_to_ssusb(struct otg_switch_mtk *otg_sx)
18{
19 return container_of(otg_sx, struct ssusb_mtk, otg_switch);
20}
21
22static void toggle_opstate(struct ssusb_mtk *ssusb)
23{
24 mtu3_setbits(ssusb->mac_base, U3D_DEVICE_CONTROL, DC_SESSION);
25 mtu3_setbits(ssusb->mac_base, U3D_POWER_MANAGEMENT, SOFT_CONN);
26}
27
28/* only port0 supports dual-role mode */
29static int ssusb_port0_switch(struct ssusb_mtk *ssusb,
30 int version, bool tohost)
31{
32 void __iomem *ibase = ssusb->ippc_base;
33 u32 value;
34
35 dev_dbg(ssusb->dev, "%s (switch u%d port0 to %s)\n", __func__,
36 version, tohost ? "host" : "device");
37
38 if (version == USB2_PORT) {
39 /* 1. power off and disable u2 port0 */
40 value = mtu3_readl(ibase, SSUSB_U2_CTRL(0));
41 value |= SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS;
42 mtu3_writel(ibase, SSUSB_U2_CTRL(0), value);
43
44 /* 2. power on, enable u2 port0 and select its mode */
45 value = mtu3_readl(ibase, SSUSB_U2_CTRL(0));
46 value &= ~(SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS);
47 value = tohost ? (value | SSUSB_U2_PORT_HOST_SEL) :
48 (value & (~SSUSB_U2_PORT_HOST_SEL));
49 mtu3_writel(ibase, SSUSB_U2_CTRL(0), value);
50 } else {
51 /* 1. power off and disable u3 port0 */
52 value = mtu3_readl(ibase, SSUSB_U3_CTRL(0));
53 value |= SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS;
54 mtu3_writel(ibase, SSUSB_U3_CTRL(0), value);
55
56 /* 2. power on, enable u3 port0 and select its mode */
57 value = mtu3_readl(ibase, SSUSB_U3_CTRL(0));
58 value &= ~(SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS);
59 value = tohost ? (value | SSUSB_U3_PORT_HOST_SEL) :
60 (value & (~SSUSB_U3_PORT_HOST_SEL));
61 mtu3_writel(ibase, SSUSB_U3_CTRL(0), value);
62 }
63
64 return 0;
65}
66
67static void switch_port_to_host(struct ssusb_mtk *ssusb)
68{
69 u32 check_clk = 0;
70
71 dev_dbg(ssusb->dev, "%s\n", __func__);
72
73 ssusb_port0_switch(ssusb, USB2_PORT, true);
74
75 if (ssusb->otg_switch.is_u3_drd) {
76 ssusb_port0_switch(ssusb, USB3_PORT, true);
77 check_clk = SSUSB_U3_MAC_RST_B_STS;
78 }
79
80 ssusb_check_clocks(ssusb, check_clk);
81
82 /* after all clocks are stable */
83 toggle_opstate(ssusb);
84}
85
86static void switch_port_to_device(struct ssusb_mtk *ssusb)
87{
88 u32 check_clk = 0;
89
90 dev_dbg(ssusb->dev, "%s\n", __func__);
91
92 ssusb_port0_switch(ssusb, USB2_PORT, false);
93
94 if (ssusb->otg_switch.is_u3_drd) {
95 ssusb_port0_switch(ssusb, USB3_PORT, false);
96 check_clk = SSUSB_U3_MAC_RST_B_STS;
97 }
98
99 ssusb_check_clocks(ssusb, check_clk);
100}
101
102int ssusb_set_vbus(struct otg_switch_mtk *otg_sx, int is_on)
103{
104 struct ssusb_mtk *ssusb = otg_sx_to_ssusb(otg_sx);
105 struct regulator *vbus = otg_sx->vbus;
106 int ret;
107
108 /* vbus is optional */
109 if (!vbus)
110 return 0;
111
112 dev_dbg(ssusb->dev, "%s: turn %s\n", __func__, is_on ? "on" : "off");
113
114 if (is_on) {
115 ret = regulator_enable(vbus);
116 if (ret) {
117 dev_err(ssusb->dev, "vbus regulator enable failed\n");
118 return ret;
119 }
120 } else {
121 regulator_disable(vbus);
122 }
123
124 return 0;
125}
126
127static void ssusb_mode_sw_work(struct work_struct *work)
128{
129 struct otg_switch_mtk *otg_sx =
130 container_of(work, struct otg_switch_mtk, dr_work);
131 struct ssusb_mtk *ssusb = otg_sx_to_ssusb(otg_sx);
132 struct mtu3 *mtu = ssusb->u3d;
133 enum usb_role desired_role = otg_sx->desired_role;
134 enum usb_role current_role;
135
136 current_role = ssusb->is_host ? USB_ROLE_HOST : USB_ROLE_DEVICE;
137
138 if (desired_role == USB_ROLE_NONE) {
139 /* the default mode is host as probe does */
140 desired_role = USB_ROLE_HOST;
141 if (otg_sx->default_role == USB_ROLE_DEVICE)
142 desired_role = USB_ROLE_DEVICE;
143 }
144
145 if (current_role == desired_role)
146 return;
147
148 dev_dbg(ssusb->dev, "set role : %s\n", usb_role_string(desired_role));
149 mtu3_dbg_trace(ssusb->dev, "set role : %s", usb_role_string(desired_role));
150 pm_runtime_get_sync(ssusb->dev);
151
152 switch (desired_role) {
153 case USB_ROLE_HOST:
154 ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_HOST);
155 mtu3_stop(mtu);
156 switch_port_to_host(ssusb);
157 ssusb_set_vbus(otg_sx, 1);
158 ssusb->is_host = true;
159 break;
160 case USB_ROLE_DEVICE:
161 ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_DEVICE);
162 ssusb->is_host = false;
163 ssusb_set_vbus(otg_sx, 0);
164 switch_port_to_device(ssusb);
165 mtu3_start(mtu);
166 break;
167 case USB_ROLE_NONE:
168 default:
169 dev_err(ssusb->dev, "invalid role\n");
170 }
171 pm_runtime_put(ssusb->dev);
172}
173
174static void ssusb_set_mode(struct otg_switch_mtk *otg_sx, enum usb_role role)
175{
176 struct ssusb_mtk *ssusb = otg_sx_to_ssusb(otg_sx);
177
178 if (ssusb->dr_mode != USB_DR_MODE_OTG)
179 return;
180
181 otg_sx->desired_role = role;
182 queue_work(system_freezable_wq, &otg_sx->dr_work);
183}
184
185static int ssusb_id_notifier(struct notifier_block *nb,
186 unsigned long event, void *ptr)
187{
188 struct otg_switch_mtk *otg_sx =
189 container_of(nb, struct otg_switch_mtk, id_nb);
190
191 ssusb_set_mode(otg_sx, event ? USB_ROLE_HOST : USB_ROLE_DEVICE);
192
193 return NOTIFY_DONE;
194}
195
196static int ssusb_extcon_register(struct otg_switch_mtk *otg_sx)
197{
198 struct ssusb_mtk *ssusb = otg_sx_to_ssusb(otg_sx);
199 struct extcon_dev *edev = otg_sx->edev;
200 int ret;
201
202 /* extcon is optional */
203 if (!edev)
204 return 0;
205
206 otg_sx->id_nb.notifier_call = ssusb_id_notifier;
207 ret = devm_extcon_register_notifier(ssusb->dev, edev, EXTCON_USB_HOST,
208 &otg_sx->id_nb);
209 if (ret < 0) {
210 dev_err(ssusb->dev, "failed to register notifier for USB-HOST\n");
211 return ret;
212 }
213
214 ret = extcon_get_state(edev, EXTCON_USB_HOST);
215 dev_dbg(ssusb->dev, "EXTCON_USB_HOST: %d\n", ret);
216
217 /* default as host, switch to device mode if needed */
218 if (!ret)
219 ssusb_set_mode(otg_sx, USB_ROLE_DEVICE);
220
221 return 0;
222}
223
224/*
225 * We provide an interface via debugfs to switch between host and device modes
226 * depending on user input.
227 * This is useful in special cases, such as uses TYPE-A receptacle but also
228 * wants to support dual-role mode.
229 */
230void ssusb_mode_switch(struct ssusb_mtk *ssusb, int to_host)
231{
232 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
233
234 ssusb_set_mode(otg_sx, to_host ? USB_ROLE_HOST : USB_ROLE_DEVICE);
235}
236
237void ssusb_set_force_mode(struct ssusb_mtk *ssusb,
238 enum mtu3_dr_force_mode mode)
239{
240 u32 value;
241
242 value = mtu3_readl(ssusb->ippc_base, SSUSB_U2_CTRL(0));
243 switch (mode) {
244 case MTU3_DR_FORCE_DEVICE:
245 value |= SSUSB_U2_PORT_FORCE_IDDIG | SSUSB_U2_PORT_RG_IDDIG;
246 break;
247 case MTU3_DR_FORCE_HOST:
248 value |= SSUSB_U2_PORT_FORCE_IDDIG;
249 value &= ~SSUSB_U2_PORT_RG_IDDIG;
250 break;
251 case MTU3_DR_FORCE_NONE:
252 value &= ~(SSUSB_U2_PORT_FORCE_IDDIG | SSUSB_U2_PORT_RG_IDDIG);
253 break;
254 default:
255 return;
256 }
257 mtu3_writel(ssusb->ippc_base, SSUSB_U2_CTRL(0), value);
258}
259
260static int ssusb_role_sw_set(struct usb_role_switch *sw, enum usb_role role)
261{
262 struct ssusb_mtk *ssusb = usb_role_switch_get_drvdata(sw);
263 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
264
265 ssusb_set_mode(otg_sx, role);
266
267 return 0;
268}
269
270static enum usb_role ssusb_role_sw_get(struct usb_role_switch *sw)
271{
272 struct ssusb_mtk *ssusb = usb_role_switch_get_drvdata(sw);
273
274 return ssusb->is_host ? USB_ROLE_HOST : USB_ROLE_DEVICE;
275}
276
277static int ssusb_role_sw_register(struct otg_switch_mtk *otg_sx)
278{
279 struct usb_role_switch_desc role_sx_desc = { 0 };
280 struct ssusb_mtk *ssusb = otg_sx_to_ssusb(otg_sx);
281 struct device *dev = ssusb->dev;
282 enum usb_dr_mode mode;
283
284 if (!otg_sx->role_sw_used)
285 return 0;
286
287 mode = usb_get_role_switch_default_mode(dev);
288 if (mode == USB_DR_MODE_PERIPHERAL)
289 otg_sx->default_role = USB_ROLE_DEVICE;
290 else
291 otg_sx->default_role = USB_ROLE_HOST;
292
293 role_sx_desc.set = ssusb_role_sw_set;
294 role_sx_desc.get = ssusb_role_sw_get;
295 role_sx_desc.fwnode = dev_fwnode(dev);
296 role_sx_desc.driver_data = ssusb;
297 role_sx_desc.allow_userspace_control = true;
298 otg_sx->role_sw = usb_role_switch_register(dev, &role_sx_desc);
299 if (IS_ERR(otg_sx->role_sw))
300 return PTR_ERR(otg_sx->role_sw);
301
302 ssusb_set_mode(otg_sx, otg_sx->default_role);
303
304 return 0;
305}
306
307int ssusb_otg_switch_init(struct ssusb_mtk *ssusb)
308{
309 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
310 int ret = 0;
311
312 INIT_WORK(&otg_sx->dr_work, ssusb_mode_sw_work);
313
314 if (otg_sx->manual_drd_enabled)
315 ssusb_dr_debugfs_init(ssusb);
316 else if (otg_sx->role_sw_used)
317 ret = ssusb_role_sw_register(otg_sx);
318 else
319 ret = ssusb_extcon_register(otg_sx);
320
321 return ret;
322}
323
324void ssusb_otg_switch_exit(struct ssusb_mtk *ssusb)
325{
326 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
327
328 cancel_work_sync(&otg_sx->dr_work);
329 usb_role_switch_unregister(otg_sx->role_sw);
330}
1/*
2 * mtu3_dr.c - dual role switch and host glue layer
3 *
4 * Copyright (C) 2016 MediaTek Inc.
5 *
6 * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
7 *
8 * This software is licensed under the terms of the GNU General Public
9 * License version 2, as published by the Free Software Foundation, and
10 * may be copied, distributed, and modified under those terms.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 */
18
19#include <linux/debugfs.h>
20#include <linux/irq.h>
21#include <linux/kernel.h>
22#include <linux/of_device.h>
23#include <linux/pinctrl/consumer.h>
24#include <linux/seq_file.h>
25#include <linux/uaccess.h>
26
27#include "mtu3.h"
28#include "mtu3_dr.h"
29
30#define USB2_PORT 2
31#define USB3_PORT 3
32
33enum mtu3_vbus_id_state {
34 MTU3_ID_FLOAT = 1,
35 MTU3_ID_GROUND,
36 MTU3_VBUS_OFF,
37 MTU3_VBUS_VALID,
38};
39
40static void toggle_opstate(struct ssusb_mtk *ssusb)
41{
42 if (!ssusb->otg_switch.is_u3_drd) {
43 mtu3_setbits(ssusb->mac_base, U3D_DEVICE_CONTROL, DC_SESSION);
44 mtu3_setbits(ssusb->mac_base, U3D_POWER_MANAGEMENT, SOFT_CONN);
45 }
46}
47
48/* only port0 supports dual-role mode */
49static int ssusb_port0_switch(struct ssusb_mtk *ssusb,
50 int version, bool tohost)
51{
52 void __iomem *ibase = ssusb->ippc_base;
53 u32 value;
54
55 dev_dbg(ssusb->dev, "%s (switch u%d port0 to %s)\n", __func__,
56 version, tohost ? "host" : "device");
57
58 if (version == USB2_PORT) {
59 /* 1. power off and disable u2 port0 */
60 value = mtu3_readl(ibase, SSUSB_U2_CTRL(0));
61 value |= SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS;
62 mtu3_writel(ibase, SSUSB_U2_CTRL(0), value);
63
64 /* 2. power on, enable u2 port0 and select its mode */
65 value = mtu3_readl(ibase, SSUSB_U2_CTRL(0));
66 value &= ~(SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS);
67 value = tohost ? (value | SSUSB_U2_PORT_HOST_SEL) :
68 (value & (~SSUSB_U2_PORT_HOST_SEL));
69 mtu3_writel(ibase, SSUSB_U2_CTRL(0), value);
70 } else {
71 /* 1. power off and disable u3 port0 */
72 value = mtu3_readl(ibase, SSUSB_U3_CTRL(0));
73 value |= SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS;
74 mtu3_writel(ibase, SSUSB_U3_CTRL(0), value);
75
76 /* 2. power on, enable u3 port0 and select its mode */
77 value = mtu3_readl(ibase, SSUSB_U3_CTRL(0));
78 value &= ~(SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS);
79 value = tohost ? (value | SSUSB_U3_PORT_HOST_SEL) :
80 (value & (~SSUSB_U3_PORT_HOST_SEL));
81 mtu3_writel(ibase, SSUSB_U3_CTRL(0), value);
82 }
83
84 return 0;
85}
86
87static void switch_port_to_host(struct ssusb_mtk *ssusb)
88{
89 u32 check_clk = 0;
90
91 dev_dbg(ssusb->dev, "%s\n", __func__);
92
93 ssusb_port0_switch(ssusb, USB2_PORT, true);
94
95 if (ssusb->otg_switch.is_u3_drd) {
96 ssusb_port0_switch(ssusb, USB3_PORT, true);
97 check_clk = SSUSB_U3_MAC_RST_B_STS;
98 }
99
100 ssusb_check_clocks(ssusb, check_clk);
101
102 /* after all clocks are stable */
103 toggle_opstate(ssusb);
104}
105
106static void switch_port_to_device(struct ssusb_mtk *ssusb)
107{
108 u32 check_clk = 0;
109
110 dev_dbg(ssusb->dev, "%s\n", __func__);
111
112 ssusb_port0_switch(ssusb, USB2_PORT, false);
113
114 if (ssusb->otg_switch.is_u3_drd) {
115 ssusb_port0_switch(ssusb, USB3_PORT, false);
116 check_clk = SSUSB_U3_MAC_RST_B_STS;
117 }
118
119 ssusb_check_clocks(ssusb, check_clk);
120}
121
122int ssusb_set_vbus(struct otg_switch_mtk *otg_sx, int is_on)
123{
124 struct ssusb_mtk *ssusb =
125 container_of(otg_sx, struct ssusb_mtk, otg_switch);
126 struct regulator *vbus = otg_sx->vbus;
127 int ret;
128
129 /* vbus is optional */
130 if (!vbus)
131 return 0;
132
133 dev_dbg(ssusb->dev, "%s: turn %s\n", __func__, is_on ? "on" : "off");
134
135 if (is_on) {
136 ret = regulator_enable(vbus);
137 if (ret) {
138 dev_err(ssusb->dev, "vbus regulator enable failed\n");
139 return ret;
140 }
141 } else {
142 regulator_disable(vbus);
143 }
144
145 return 0;
146}
147
148/*
149 * switch to host: -> MTU3_VBUS_OFF --> MTU3_ID_GROUND
150 * switch to device: -> MTU3_ID_FLOAT --> MTU3_VBUS_VALID
151 */
152static void ssusb_set_mailbox(struct otg_switch_mtk *otg_sx,
153 enum mtu3_vbus_id_state status)
154{
155 struct ssusb_mtk *ssusb =
156 container_of(otg_sx, struct ssusb_mtk, otg_switch);
157 struct mtu3 *mtu = ssusb->u3d;
158
159 dev_dbg(ssusb->dev, "mailbox state(%d)\n", status);
160
161 switch (status) {
162 case MTU3_ID_GROUND:
163 switch_port_to_host(ssusb);
164 ssusb_set_vbus(otg_sx, 1);
165 ssusb->is_host = true;
166 break;
167 case MTU3_ID_FLOAT:
168 ssusb->is_host = false;
169 ssusb_set_vbus(otg_sx, 0);
170 switch_port_to_device(ssusb);
171 break;
172 case MTU3_VBUS_OFF:
173 mtu3_stop(mtu);
174 pm_relax(ssusb->dev);
175 break;
176 case MTU3_VBUS_VALID:
177 /* avoid suspend when works as device */
178 pm_stay_awake(ssusb->dev);
179 mtu3_start(mtu);
180 break;
181 default:
182 dev_err(ssusb->dev, "invalid state\n");
183 }
184}
185
186static int ssusb_id_notifier(struct notifier_block *nb,
187 unsigned long event, void *ptr)
188{
189 struct otg_switch_mtk *otg_sx =
190 container_of(nb, struct otg_switch_mtk, id_nb);
191
192 if (event)
193 ssusb_set_mailbox(otg_sx, MTU3_ID_GROUND);
194 else
195 ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);
196
197 return NOTIFY_DONE;
198}
199
200static int ssusb_vbus_notifier(struct notifier_block *nb,
201 unsigned long event, void *ptr)
202{
203 struct otg_switch_mtk *otg_sx =
204 container_of(nb, struct otg_switch_mtk, vbus_nb);
205
206 if (event)
207 ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);
208 else
209 ssusb_set_mailbox(otg_sx, MTU3_VBUS_OFF);
210
211 return NOTIFY_DONE;
212}
213
214static int ssusb_extcon_register(struct otg_switch_mtk *otg_sx)
215{
216 struct ssusb_mtk *ssusb =
217 container_of(otg_sx, struct ssusb_mtk, otg_switch);
218 struct extcon_dev *edev = otg_sx->edev;
219 int ret;
220
221 /* extcon is optional */
222 if (!edev)
223 return 0;
224
225 otg_sx->vbus_nb.notifier_call = ssusb_vbus_notifier;
226 ret = extcon_register_notifier(edev, EXTCON_USB,
227 &otg_sx->vbus_nb);
228 if (ret < 0)
229 dev_err(ssusb->dev, "failed to register notifier for USB\n");
230
231 otg_sx->id_nb.notifier_call = ssusb_id_notifier;
232 ret = extcon_register_notifier(edev, EXTCON_USB_HOST,
233 &otg_sx->id_nb);
234 if (ret < 0)
235 dev_err(ssusb->dev, "failed to register notifier for USB-HOST\n");
236
237 dev_dbg(ssusb->dev, "EXTCON_USB: %d, EXTCON_USB_HOST: %d\n",
238 extcon_get_cable_state_(edev, EXTCON_USB),
239 extcon_get_cable_state_(edev, EXTCON_USB_HOST));
240
241 /* default as host, switch to device mode if needed */
242 if (extcon_get_cable_state_(edev, EXTCON_USB_HOST) == false)
243 ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);
244 if (extcon_get_cable_state_(edev, EXTCON_USB) == true)
245 ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);
246
247 return 0;
248}
249
250static void extcon_register_dwork(struct work_struct *work)
251{
252 struct delayed_work *dwork = to_delayed_work(work);
253 struct otg_switch_mtk *otg_sx =
254 container_of(dwork, struct otg_switch_mtk, extcon_reg_dwork);
255
256 ssusb_extcon_register(otg_sx);
257}
258
259/*
260 * We provide an interface via debugfs to switch between host and device modes
261 * depending on user input.
262 * This is useful in special cases, such as uses TYPE-A receptacle but also
263 * wants to support dual-role mode.
264 * It generates cable state changes by pulling up/down IDPIN and
265 * notifies driver to switch mode by "extcon-usb-gpio".
266 * NOTE: when use MICRO receptacle, should not enable this interface.
267 */
268static void ssusb_mode_manual_switch(struct ssusb_mtk *ssusb, int to_host)
269{
270 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
271
272 if (to_host)
273 pinctrl_select_state(otg_sx->id_pinctrl, otg_sx->id_ground);
274 else
275 pinctrl_select_state(otg_sx->id_pinctrl, otg_sx->id_float);
276}
277
278
279static int ssusb_mode_show(struct seq_file *sf, void *unused)
280{
281 struct ssusb_mtk *ssusb = sf->private;
282
283 seq_printf(sf, "current mode: %s(%s drd)\n(echo device/host)\n",
284 ssusb->is_host ? "host" : "device",
285 ssusb->otg_switch.manual_drd_enabled ? "manual" : "auto");
286
287 return 0;
288}
289
290static int ssusb_mode_open(struct inode *inode, struct file *file)
291{
292 return single_open(file, ssusb_mode_show, inode->i_private);
293}
294
295static ssize_t ssusb_mode_write(struct file *file,
296 const char __user *ubuf, size_t count, loff_t *ppos)
297{
298 struct seq_file *sf = file->private_data;
299 struct ssusb_mtk *ssusb = sf->private;
300 char buf[16];
301
302 if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
303 return -EFAULT;
304
305 if (!strncmp(buf, "host", 4) && !ssusb->is_host) {
306 ssusb_mode_manual_switch(ssusb, 1);
307 } else if (!strncmp(buf, "device", 6) && ssusb->is_host) {
308 ssusb_mode_manual_switch(ssusb, 0);
309 } else {
310 dev_err(ssusb->dev, "wrong or duplicated setting\n");
311 return -EINVAL;
312 }
313
314 return count;
315}
316
317static const struct file_operations ssusb_mode_fops = {
318 .open = ssusb_mode_open,
319 .write = ssusb_mode_write,
320 .read = seq_read,
321 .llseek = seq_lseek,
322 .release = single_release,
323};
324
325static void ssusb_debugfs_init(struct ssusb_mtk *ssusb)
326{
327 struct dentry *root;
328 struct dentry *file;
329
330 root = debugfs_create_dir(dev_name(ssusb->dev), usb_debug_root);
331 if (IS_ERR_OR_NULL(root)) {
332 if (!root)
333 dev_err(ssusb->dev, "create debugfs root failed\n");
334 return;
335 }
336 ssusb->dbgfs_root = root;
337
338 file = debugfs_create_file("mode", S_IRUGO | S_IWUSR, root,
339 ssusb, &ssusb_mode_fops);
340 if (!file)
341 dev_dbg(ssusb->dev, "create debugfs mode failed\n");
342}
343
344static void ssusb_debugfs_exit(struct ssusb_mtk *ssusb)
345{
346 debugfs_remove_recursive(ssusb->dbgfs_root);
347}
348
349int ssusb_otg_switch_init(struct ssusb_mtk *ssusb)
350{
351 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
352
353 INIT_DELAYED_WORK(&otg_sx->extcon_reg_dwork, extcon_register_dwork);
354
355 if (otg_sx->manual_drd_enabled)
356 ssusb_debugfs_init(ssusb);
357
358 /* It is enough to delay 1s for waiting for host initialization */
359 schedule_delayed_work(&otg_sx->extcon_reg_dwork, HZ);
360
361 return 0;
362}
363
364void ssusb_otg_switch_exit(struct ssusb_mtk *ssusb)
365{
366 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
367
368 cancel_delayed_work(&otg_sx->extcon_reg_dwork);
369
370 if (otg_sx->edev) {
371 extcon_unregister_notifier(otg_sx->edev,
372 EXTCON_USB, &otg_sx->vbus_nb);
373 extcon_unregister_notifier(otg_sx->edev,
374 EXTCON_USB_HOST, &otg_sx->id_nb);
375 }
376
377 if (otg_sx->manual_drd_enabled)
378 ssusb_debugfs_exit(ssusb);
379}