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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// 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 <linux/debugfs.h>
11#include <linux/irq.h>
12#include <linux/kernel.h>
13#include <linux/of_device.h>
14#include <linux/pinctrl/consumer.h>
15#include <linux/seq_file.h>
16#include <linux/uaccess.h>
17
18#include "mtu3.h"
19#include "mtu3_dr.h"
20
21#define USB2_PORT 2
22#define USB3_PORT 3
23
24enum mtu3_vbus_id_state {
25 MTU3_ID_FLOAT = 1,
26 MTU3_ID_GROUND,
27 MTU3_VBUS_OFF,
28 MTU3_VBUS_VALID,
29};
30
31static void toggle_opstate(struct ssusb_mtk *ssusb)
32{
33 if (!ssusb->otg_switch.is_u3_drd) {
34 mtu3_setbits(ssusb->mac_base, U3D_DEVICE_CONTROL, DC_SESSION);
35 mtu3_setbits(ssusb->mac_base, U3D_POWER_MANAGEMENT, SOFT_CONN);
36 }
37}
38
39/* only port0 supports dual-role mode */
40static int ssusb_port0_switch(struct ssusb_mtk *ssusb,
41 int version, bool tohost)
42{
43 void __iomem *ibase = ssusb->ippc_base;
44 u32 value;
45
46 dev_dbg(ssusb->dev, "%s (switch u%d port0 to %s)\n", __func__,
47 version, tohost ? "host" : "device");
48
49 if (version == USB2_PORT) {
50 /* 1. power off and disable u2 port0 */
51 value = mtu3_readl(ibase, SSUSB_U2_CTRL(0));
52 value |= SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS;
53 mtu3_writel(ibase, SSUSB_U2_CTRL(0), value);
54
55 /* 2. power on, enable u2 port0 and select its mode */
56 value = mtu3_readl(ibase, SSUSB_U2_CTRL(0));
57 value &= ~(SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS);
58 value = tohost ? (value | SSUSB_U2_PORT_HOST_SEL) :
59 (value & (~SSUSB_U2_PORT_HOST_SEL));
60 mtu3_writel(ibase, SSUSB_U2_CTRL(0), value);
61 } else {
62 /* 1. power off and disable u3 port0 */
63 value = mtu3_readl(ibase, SSUSB_U3_CTRL(0));
64 value |= SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS;
65 mtu3_writel(ibase, SSUSB_U3_CTRL(0), value);
66
67 /* 2. power on, enable u3 port0 and select its mode */
68 value = mtu3_readl(ibase, SSUSB_U3_CTRL(0));
69 value &= ~(SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS);
70 value = tohost ? (value | SSUSB_U3_PORT_HOST_SEL) :
71 (value & (~SSUSB_U3_PORT_HOST_SEL));
72 mtu3_writel(ibase, SSUSB_U3_CTRL(0), value);
73 }
74
75 return 0;
76}
77
78static void switch_port_to_host(struct ssusb_mtk *ssusb)
79{
80 u32 check_clk = 0;
81
82 dev_dbg(ssusb->dev, "%s\n", __func__);
83
84 ssusb_port0_switch(ssusb, USB2_PORT, true);
85
86 if (ssusb->otg_switch.is_u3_drd) {
87 ssusb_port0_switch(ssusb, USB3_PORT, true);
88 check_clk = SSUSB_U3_MAC_RST_B_STS;
89 }
90
91 ssusb_check_clocks(ssusb, check_clk);
92
93 /* after all clocks are stable */
94 toggle_opstate(ssusb);
95}
96
97static void switch_port_to_device(struct ssusb_mtk *ssusb)
98{
99 u32 check_clk = 0;
100
101 dev_dbg(ssusb->dev, "%s\n", __func__);
102
103 ssusb_port0_switch(ssusb, USB2_PORT, false);
104
105 if (ssusb->otg_switch.is_u3_drd) {
106 ssusb_port0_switch(ssusb, USB3_PORT, false);
107 check_clk = SSUSB_U3_MAC_RST_B_STS;
108 }
109
110 ssusb_check_clocks(ssusb, check_clk);
111}
112
113int ssusb_set_vbus(struct otg_switch_mtk *otg_sx, int is_on)
114{
115 struct ssusb_mtk *ssusb =
116 container_of(otg_sx, struct ssusb_mtk, otg_switch);
117 struct regulator *vbus = otg_sx->vbus;
118 int ret;
119
120 /* vbus is optional */
121 if (!vbus)
122 return 0;
123
124 dev_dbg(ssusb->dev, "%s: turn %s\n", __func__, is_on ? "on" : "off");
125
126 if (is_on) {
127 ret = regulator_enable(vbus);
128 if (ret) {
129 dev_err(ssusb->dev, "vbus regulator enable failed\n");
130 return ret;
131 }
132 } else {
133 regulator_disable(vbus);
134 }
135
136 return 0;
137}
138
139/*
140 * switch to host: -> MTU3_VBUS_OFF --> MTU3_ID_GROUND
141 * switch to device: -> MTU3_ID_FLOAT --> MTU3_VBUS_VALID
142 */
143static void ssusb_set_mailbox(struct otg_switch_mtk *otg_sx,
144 enum mtu3_vbus_id_state status)
145{
146 struct ssusb_mtk *ssusb =
147 container_of(otg_sx, struct ssusb_mtk, otg_switch);
148 struct mtu3 *mtu = ssusb->u3d;
149
150 dev_dbg(ssusb->dev, "mailbox state(%d)\n", status);
151
152 switch (status) {
153 case MTU3_ID_GROUND:
154 switch_port_to_host(ssusb);
155 ssusb_set_vbus(otg_sx, 1);
156 ssusb->is_host = true;
157 break;
158 case MTU3_ID_FLOAT:
159 ssusb->is_host = false;
160 ssusb_set_vbus(otg_sx, 0);
161 switch_port_to_device(ssusb);
162 break;
163 case MTU3_VBUS_OFF:
164 mtu3_stop(mtu);
165 pm_relax(ssusb->dev);
166 break;
167 case MTU3_VBUS_VALID:
168 /* avoid suspend when works as device */
169 pm_stay_awake(ssusb->dev);
170 mtu3_start(mtu);
171 break;
172 default:
173 dev_err(ssusb->dev, "invalid state\n");
174 }
175}
176
177static int ssusb_id_notifier(struct notifier_block *nb,
178 unsigned long event, void *ptr)
179{
180 struct otg_switch_mtk *otg_sx =
181 container_of(nb, struct otg_switch_mtk, id_nb);
182
183 if (event)
184 ssusb_set_mailbox(otg_sx, MTU3_ID_GROUND);
185 else
186 ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);
187
188 return NOTIFY_DONE;
189}
190
191static int ssusb_vbus_notifier(struct notifier_block *nb,
192 unsigned long event, void *ptr)
193{
194 struct otg_switch_mtk *otg_sx =
195 container_of(nb, struct otg_switch_mtk, vbus_nb);
196
197 if (event)
198 ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);
199 else
200 ssusb_set_mailbox(otg_sx, MTU3_VBUS_OFF);
201
202 return NOTIFY_DONE;
203}
204
205static int ssusb_extcon_register(struct otg_switch_mtk *otg_sx)
206{
207 struct ssusb_mtk *ssusb =
208 container_of(otg_sx, struct ssusb_mtk, otg_switch);
209 struct extcon_dev *edev = otg_sx->edev;
210 int ret;
211
212 /* extcon is optional */
213 if (!edev)
214 return 0;
215
216 otg_sx->vbus_nb.notifier_call = ssusb_vbus_notifier;
217 ret = devm_extcon_register_notifier(ssusb->dev, edev, EXTCON_USB,
218 &otg_sx->vbus_nb);
219 if (ret < 0)
220 dev_err(ssusb->dev, "failed to register notifier for USB\n");
221
222 otg_sx->id_nb.notifier_call = ssusb_id_notifier;
223 ret = devm_extcon_register_notifier(ssusb->dev, edev, EXTCON_USB_HOST,
224 &otg_sx->id_nb);
225 if (ret < 0)
226 dev_err(ssusb->dev, "failed to register notifier for USB-HOST\n");
227
228 dev_dbg(ssusb->dev, "EXTCON_USB: %d, EXTCON_USB_HOST: %d\n",
229 extcon_get_state(edev, EXTCON_USB),
230 extcon_get_state(edev, EXTCON_USB_HOST));
231
232 /* default as host, switch to device mode if needed */
233 if (extcon_get_state(edev, EXTCON_USB_HOST) == false)
234 ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);
235 if (extcon_get_state(edev, EXTCON_USB) == true)
236 ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);
237
238 return 0;
239}
240
241static void extcon_register_dwork(struct work_struct *work)
242{
243 struct delayed_work *dwork = to_delayed_work(work);
244 struct otg_switch_mtk *otg_sx =
245 container_of(dwork, struct otg_switch_mtk, extcon_reg_dwork);
246
247 ssusb_extcon_register(otg_sx);
248}
249
250/*
251 * We provide an interface via debugfs to switch between host and device modes
252 * depending on user input.
253 * This is useful in special cases, such as uses TYPE-A receptacle but also
254 * wants to support dual-role mode.
255 */
256static void ssusb_mode_manual_switch(struct ssusb_mtk *ssusb, int to_host)
257{
258 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
259
260 if (to_host) {
261 ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_HOST);
262 ssusb_set_mailbox(otg_sx, MTU3_VBUS_OFF);
263 ssusb_set_mailbox(otg_sx, MTU3_ID_GROUND);
264 } else {
265 ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_DEVICE);
266 ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);
267 ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);
268 }
269}
270
271static int ssusb_mode_show(struct seq_file *sf, void *unused)
272{
273 struct ssusb_mtk *ssusb = sf->private;
274
275 seq_printf(sf, "current mode: %s(%s drd)\n(echo device/host)\n",
276 ssusb->is_host ? "host" : "device",
277 ssusb->otg_switch.manual_drd_enabled ? "manual" : "auto");
278
279 return 0;
280}
281
282static int ssusb_mode_open(struct inode *inode, struct file *file)
283{
284 return single_open(file, ssusb_mode_show, inode->i_private);
285}
286
287static ssize_t ssusb_mode_write(struct file *file,
288 const char __user *ubuf, size_t count, loff_t *ppos)
289{
290 struct seq_file *sf = file->private_data;
291 struct ssusb_mtk *ssusb = sf->private;
292 char buf[16];
293
294 if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
295 return -EFAULT;
296
297 if (!strncmp(buf, "host", 4) && !ssusb->is_host) {
298 ssusb_mode_manual_switch(ssusb, 1);
299 } else if (!strncmp(buf, "device", 6) && ssusb->is_host) {
300 ssusb_mode_manual_switch(ssusb, 0);
301 } else {
302 dev_err(ssusb->dev, "wrong or duplicated setting\n");
303 return -EINVAL;
304 }
305
306 return count;
307}
308
309static const struct file_operations ssusb_mode_fops = {
310 .open = ssusb_mode_open,
311 .write = ssusb_mode_write,
312 .read = seq_read,
313 .llseek = seq_lseek,
314 .release = single_release,
315};
316
317static int ssusb_vbus_show(struct seq_file *sf, void *unused)
318{
319 struct ssusb_mtk *ssusb = sf->private;
320 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
321
322 seq_printf(sf, "vbus state: %s\n(echo on/off)\n",
323 regulator_is_enabled(otg_sx->vbus) ? "on" : "off");
324
325 return 0;
326}
327
328static int ssusb_vbus_open(struct inode *inode, struct file *file)
329{
330 return single_open(file, ssusb_vbus_show, inode->i_private);
331}
332
333static ssize_t ssusb_vbus_write(struct file *file,
334 const char __user *ubuf, size_t count, loff_t *ppos)
335{
336 struct seq_file *sf = file->private_data;
337 struct ssusb_mtk *ssusb = sf->private;
338 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
339 char buf[16];
340 bool enable;
341
342 if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
343 return -EFAULT;
344
345 if (kstrtobool(buf, &enable)) {
346 dev_err(ssusb->dev, "wrong setting\n");
347 return -EINVAL;
348 }
349
350 ssusb_set_vbus(otg_sx, enable);
351
352 return count;
353}
354
355static const struct file_operations ssusb_vbus_fops = {
356 .open = ssusb_vbus_open,
357 .write = ssusb_vbus_write,
358 .read = seq_read,
359 .llseek = seq_lseek,
360 .release = single_release,
361};
362
363static void ssusb_debugfs_init(struct ssusb_mtk *ssusb)
364{
365 struct dentry *root;
366
367 root = debugfs_create_dir(dev_name(ssusb->dev), usb_debug_root);
368 if (!root) {
369 dev_err(ssusb->dev, "create debugfs root failed\n");
370 return;
371 }
372 ssusb->dbgfs_root = root;
373
374 debugfs_create_file("mode", 0644, root, ssusb, &ssusb_mode_fops);
375 debugfs_create_file("vbus", 0644, root, ssusb, &ssusb_vbus_fops);
376}
377
378static void ssusb_debugfs_exit(struct ssusb_mtk *ssusb)
379{
380 debugfs_remove_recursive(ssusb->dbgfs_root);
381}
382
383void ssusb_set_force_mode(struct ssusb_mtk *ssusb,
384 enum mtu3_dr_force_mode mode)
385{
386 u32 value;
387
388 value = mtu3_readl(ssusb->ippc_base, SSUSB_U2_CTRL(0));
389 switch (mode) {
390 case MTU3_DR_FORCE_DEVICE:
391 value |= SSUSB_U2_PORT_FORCE_IDDIG | SSUSB_U2_PORT_RG_IDDIG;
392 break;
393 case MTU3_DR_FORCE_HOST:
394 value |= SSUSB_U2_PORT_FORCE_IDDIG;
395 value &= ~SSUSB_U2_PORT_RG_IDDIG;
396 break;
397 case MTU3_DR_FORCE_NONE:
398 value &= ~(SSUSB_U2_PORT_FORCE_IDDIG | SSUSB_U2_PORT_RG_IDDIG);
399 break;
400 default:
401 return;
402 }
403 mtu3_writel(ssusb->ippc_base, SSUSB_U2_CTRL(0), value);
404}
405
406int ssusb_otg_switch_init(struct ssusb_mtk *ssusb)
407{
408 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
409
410 if (otg_sx->manual_drd_enabled) {
411 ssusb_debugfs_init(ssusb);
412 } else {
413 INIT_DELAYED_WORK(&otg_sx->extcon_reg_dwork,
414 extcon_register_dwork);
415
416 /*
417 * It is enough to delay 1s for waiting for
418 * host initialization
419 */
420 schedule_delayed_work(&otg_sx->extcon_reg_dwork, HZ);
421 }
422
423 return 0;
424}
425
426void ssusb_otg_switch_exit(struct ssusb_mtk *ssusb)
427{
428 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
429
430 if (otg_sx->manual_drd_enabled)
431 ssusb_debugfs_exit(ssusb);
432 else
433 cancel_delayed_work(&otg_sx->extcon_reg_dwork);
434}