1 /* SPDX-License-Identifier: GPL-2.0 */
2
3 #ifndef __USB_TYPEC_ALTMODE_H
4 #define __USB_TYPEC_ALTMODE_H
5
6 #include <linux/mod_devicetable.h>
7 #include <linux/usb/typec.h>
8 #include <linux/device.h>
9
10 #define MODE_DISCOVERY_MAX 6
11
12 struct typec_altmode_ops;
13
14 /**
15 * struct typec_altmode - USB Type-C alternate mode device
16 * @dev: Driver model's view of this device
17 * @svid: Standard or Vendor ID (SVID) of the alternate mode
18 * @mode: Index of the Mode
19 * @vdo: VDO returned by Discover Modes USB PD command
20 * @active: Tells has the mode been entered or not
21 * @desc: Optional human readable description of the mode
22 * @ops: Operations vector from the driver
23 * @cable_ops: Cable operations vector from the driver.
24 */
25 struct typec_altmode {
26 struct device dev;
27 u16 svid;
28 int mode;
29 u32 vdo;
30 unsigned int active:1;
31
32 char *desc;
33 const struct typec_altmode_ops *ops;
34 const struct typec_cable_ops *cable_ops;
35 };
36
37 #define to_typec_altmode(d) container_of(d, struct typec_altmode, dev)
38
typec_altmode_set_drvdata(struct typec_altmode * altmode,void * data)39 static inline void typec_altmode_set_drvdata(struct typec_altmode *altmode,
40 void *data)
41 {
42 dev_set_drvdata(&altmode->dev, data);
43 }
44
typec_altmode_get_drvdata(struct typec_altmode * altmode)45 static inline void *typec_altmode_get_drvdata(struct typec_altmode *altmode)
46 {
47 return dev_get_drvdata(&altmode->dev);
48 }
49
50 /**
51 * struct typec_altmode_ops - Alternate mode specific operations vector
52 * @enter: Operations to be executed with Enter Mode Command
53 * @exit: Operations to be executed with Exit Mode Command
54 * @attention: Callback for Attention Command
55 * @vdm: Callback for SVID specific commands
56 * @notify: Communication channel for platform and the alternate mode
57 * @activate: User callback for Enter/Exit Mode
58 */
59 struct typec_altmode_ops {
60 int (*enter)(struct typec_altmode *altmode, u32 *vdo);
61 int (*exit)(struct typec_altmode *altmode);
62 void (*attention)(struct typec_altmode *altmode, u32 vdo);
63 int (*vdm)(struct typec_altmode *altmode, const u32 hdr,
64 const u32 *vdo, int cnt);
65 int (*notify)(struct typec_altmode *altmode, unsigned long conf,
66 void *data);
67 int (*activate)(struct typec_altmode *altmode, int activate);
68 };
69
70 int typec_altmode_enter(struct typec_altmode *altmode, u32 *vdo);
71 int typec_altmode_exit(struct typec_altmode *altmode);
72 int typec_altmode_attention(struct typec_altmode *altmode, u32 vdo);
73 int typec_altmode_vdm(struct typec_altmode *altmode,
74 const u32 header, const u32 *vdo, int count);
75 int typec_altmode_notify(struct typec_altmode *altmode, unsigned long conf,
76 void *data);
77 const struct typec_altmode *
78 typec_altmode_get_partner(struct typec_altmode *altmode);
79
80 /**
81 * struct typec_cable_ops - Cable alternate mode operations vector
82 * @enter: Operations to be executed with Enter Mode Command
83 * @exit: Operations to be executed with Exit Mode Command
84 * @vdm: Callback for SVID specific commands
85 */
86 struct typec_cable_ops {
87 int (*enter)(struct typec_altmode *altmode, enum typec_plug_index sop, u32 *vdo);
88 int (*exit)(struct typec_altmode *altmode, enum typec_plug_index sop);
89 int (*vdm)(struct typec_altmode *altmode, enum typec_plug_index sop,
90 const u32 hdr, const u32 *vdo, int cnt);
91 };
92
93 int typec_cable_altmode_enter(struct typec_altmode *altmode, enum typec_plug_index sop, u32 *vdo);
94 int typec_cable_altmode_exit(struct typec_altmode *altmode, enum typec_plug_index sop);
95 int typec_cable_altmode_vdm(struct typec_altmode *altmode, enum typec_plug_index sop,
96 const u32 header, const u32 *vdo, int count);
97
98 /**
99 * typec_altmode_get_cable_svdm_version - Get negotiated SVDM version for cable plug
100 * @altmode: Handle to the alternate mode
101 */
102 static inline int
typec_altmode_get_cable_svdm_version(struct typec_altmode * altmode)103 typec_altmode_get_cable_svdm_version(struct typec_altmode *altmode)
104 {
105 return typec_get_cable_svdm_version(typec_altmode2port(altmode));
106 }
107
108 /*
109 * These are the connector states (USB, Safe and Alt Mode) defined in USB Type-C
110 * Specification. SVID specific connector states are expected to follow and
111 * start from the value TYPEC_STATE_MODAL.
112 */
113 enum {
114 TYPEC_STATE_SAFE, /* USB Safe State */
115 TYPEC_STATE_USB, /* USB Operation */
116 TYPEC_STATE_MODAL, /* Alternate Modes */
117 };
118
119 /*
120 * For the muxes there is no difference between Accessory Modes and Alternate
121 * Modes, so the Accessory Modes are supplied with specific modal state values
122 * here. Unlike with Alternate Modes, where the mux will be linked with the
123 * alternate mode device, the mux for Accessory Modes will be linked with the
124 * port device instead.
125 *
126 * Port drivers can use TYPEC_MODE_AUDIO and TYPEC_MODE_DEBUG as the mode
127 * value for typec_set_mode() when accessory modes are supported.
128 *
129 * USB4 also requires that the pins on the connector are repurposed, just like
130 * Alternate Modes. USB4 mode is however not entered with the Enter Mode Command
131 * like the Alternate Modes are, but instead with a special Enter_USB Message.
132 * The Enter_USB Message can also be used for setting to connector to operate in
133 * USB 3.2 or in USB 2.0 mode instead of USB4.
134 *
135 * The Enter_USB specific "USB Modes" are also supplied here as special modal
136 * state values, just like the Accessory Modes.
137 */
138 enum {
139 TYPEC_MODE_USB2 = TYPEC_STATE_MODAL, /* USB 2.0 mode */
140 TYPEC_MODE_USB3, /* USB 3.2 mode */
141 TYPEC_MODE_USB4, /* USB4 mode */
142 TYPEC_MODE_AUDIO, /* Audio Accessory */
143 TYPEC_MODE_DEBUG, /* Debug Accessory */
144 };
145
146 #define TYPEC_MODAL_STATE(_state_) ((_state_) + TYPEC_STATE_MODAL)
147
148 struct typec_altmode *typec_altmode_get_plug(struct typec_altmode *altmode,
149 enum typec_plug_index index);
150 void typec_altmode_put_plug(struct typec_altmode *plug);
151
152 struct typec_altmode *typec_match_altmode(struct typec_altmode **altmodes,
153 size_t n, u16 svid, u8 mode);
154
155 /**
156 * typec_altmode_get_orientation - Get cable plug orientation
157 * @altmode: Handle to the alternate mode
158 */
159 static inline enum typec_orientation
typec_altmode_get_orientation(struct typec_altmode * altmode)160 typec_altmode_get_orientation(struct typec_altmode *altmode)
161 {
162 return typec_get_orientation(typec_altmode2port(altmode));
163 }
164
165 /**
166 * typec_altmode_get_svdm_version - Get negotiated SVDM version
167 * @altmode: Handle to the alternate mode
168 */
169 static inline int
typec_altmode_get_svdm_version(struct typec_altmode * altmode)170 typec_altmode_get_svdm_version(struct typec_altmode *altmode)
171 {
172 return typec_get_negotiated_svdm_version(typec_altmode2port(altmode));
173 }
174
175 /**
176 * typec_altmode_get_data_role - Get port data role
177 * @altmode: Handle to the alternate mode
178 *
179 * Alt Mode drivers should only issue Enter Mode through the port if they are
180 * the DFP.
181 */
182 static inline enum typec_data_role
typec_altmode_get_data_role(struct typec_altmode * altmode)183 typec_altmode_get_data_role(struct typec_altmode *altmode)
184 {
185 return typec_get_data_role(typec_altmode2port(altmode));
186 }
187
188 /**
189 * struct typec_altmode_driver - USB Type-C alternate mode device driver
190 * @id_table: Null terminated array of SVIDs
191 * @probe: Callback for device binding
192 * @remove: Callback for device unbinding
193 * @driver: Device driver model driver
194 *
195 * These drivers will be bind to the partner alternate mode devices. They will
196 * handle all SVID specific communication.
197 */
198 struct typec_altmode_driver {
199 const struct typec_device_id *id_table;
200 int (*probe)(struct typec_altmode *altmode);
201 void (*remove)(struct typec_altmode *altmode);
202 struct device_driver driver;
203 };
204
205 #define to_altmode_driver(d) container_of(d, struct typec_altmode_driver, \
206 driver)
207
208 /**
209 * typec_altmode_register_driver - registers a USB Type-C alternate mode
210 * device driver
211 * @drv: pointer to struct typec_altmode_driver
212 *
213 * These drivers will be bind to the partner alternate mode devices. They will
214 * handle all SVID specific communication.
215 */
216 #define typec_altmode_register_driver(drv) \
217 __typec_altmode_register_driver(drv, THIS_MODULE)
218 int __typec_altmode_register_driver(struct typec_altmode_driver *drv,
219 struct module *module);
220 /**
221 * typec_altmode_unregister_driver - unregisters a USB Type-C alternate mode
222 * device driver
223 * @drv: pointer to struct typec_altmode_driver
224 *
225 * These drivers will be bind to the partner alternate mode devices. They will
226 * handle all SVID specific communication.
227 */
228 void typec_altmode_unregister_driver(struct typec_altmode_driver *drv);
229
230 #define module_typec_altmode_driver(__typec_altmode_driver) \
231 module_driver(__typec_altmode_driver, typec_altmode_register_driver, \
232 typec_altmode_unregister_driver)
233
234 #endif /* __USB_TYPEC_ALTMODE_H */
235