1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Power Supply for UCSI
4 *
5 * Copyright (C) 2020, Intel Corporation
6 * Author: K V, Abhilash <[email protected]>
7 * Author: Heikki Krogerus <[email protected]>
8 */
9
10 #include <linux/property.h>
11 #include <linux/usb/pd.h>
12
13 #include "ucsi.h"
14
15 /* Power Supply access to expose source power information */
16 enum ucsi_psy_online_states {
17 UCSI_PSY_OFFLINE = 0,
18 UCSI_PSY_FIXED_ONLINE,
19 UCSI_PSY_PROG_ONLINE,
20 };
21
22 static enum power_supply_property ucsi_psy_props[] = {
23 POWER_SUPPLY_PROP_CHARGE_TYPE,
24 POWER_SUPPLY_PROP_USB_TYPE,
25 POWER_SUPPLY_PROP_ONLINE,
26 POWER_SUPPLY_PROP_VOLTAGE_MIN,
27 POWER_SUPPLY_PROP_VOLTAGE_MAX,
28 POWER_SUPPLY_PROP_VOLTAGE_NOW,
29 POWER_SUPPLY_PROP_CURRENT_MAX,
30 POWER_SUPPLY_PROP_CURRENT_NOW,
31 POWER_SUPPLY_PROP_SCOPE,
32 };
33
ucsi_psy_get_scope(struct ucsi_connector * con,union power_supply_propval * val)34 static int ucsi_psy_get_scope(struct ucsi_connector *con,
35 union power_supply_propval *val)
36 {
37 u8 scope = POWER_SUPPLY_SCOPE_UNKNOWN;
38 struct device *dev = con->ucsi->dev;
39
40 device_property_read_u8(dev, "scope", &scope);
41 if (scope == POWER_SUPPLY_SCOPE_UNKNOWN) {
42 u32 mask = UCSI_CAP_ATTR_POWER_AC_SUPPLY |
43 UCSI_CAP_ATTR_BATTERY_CHARGING;
44
45 if (con->ucsi->cap.attributes & mask)
46 scope = POWER_SUPPLY_SCOPE_SYSTEM;
47 else
48 scope = POWER_SUPPLY_SCOPE_DEVICE;
49 }
50 val->intval = scope;
51 return 0;
52 }
53
ucsi_psy_get_online(struct ucsi_connector * con,union power_supply_propval * val)54 static int ucsi_psy_get_online(struct ucsi_connector *con,
55 union power_supply_propval *val)
56 {
57 val->intval = UCSI_PSY_OFFLINE;
58 if (UCSI_CONSTAT(con, CONNECTED) &&
59 (UCSI_CONSTAT(con, PWR_DIR) == TYPEC_SINK))
60 val->intval = UCSI_PSY_FIXED_ONLINE;
61 return 0;
62 }
63
ucsi_psy_get_voltage_min(struct ucsi_connector * con,union power_supply_propval * val)64 static int ucsi_psy_get_voltage_min(struct ucsi_connector *con,
65 union power_supply_propval *val)
66 {
67 u32 pdo;
68
69 switch (UCSI_CONSTAT(con, PWR_OPMODE)) {
70 case UCSI_CONSTAT_PWR_OPMODE_PD:
71 pdo = con->src_pdos[0];
72 val->intval = pdo_fixed_voltage(pdo) * 1000;
73 break;
74 case UCSI_CONSTAT_PWR_OPMODE_TYPEC3_0:
75 case UCSI_CONSTAT_PWR_OPMODE_TYPEC1_5:
76 case UCSI_CONSTAT_PWR_OPMODE_BC:
77 case UCSI_CONSTAT_PWR_OPMODE_DEFAULT:
78 val->intval = UCSI_TYPEC_VSAFE5V * 1000;
79 break;
80 default:
81 val->intval = 0;
82 break;
83 }
84 return 0;
85 }
86
ucsi_psy_get_voltage_max(struct ucsi_connector * con,union power_supply_propval * val)87 static int ucsi_psy_get_voltage_max(struct ucsi_connector *con,
88 union power_supply_propval *val)
89 {
90 u32 pdo;
91
92 switch (UCSI_CONSTAT(con, PWR_OPMODE)) {
93 case UCSI_CONSTAT_PWR_OPMODE_PD:
94 if (con->num_pdos > 0) {
95 pdo = con->src_pdos[con->num_pdos - 1];
96 val->intval = pdo_fixed_voltage(pdo) * 1000;
97 } else {
98 val->intval = 0;
99 }
100 break;
101 case UCSI_CONSTAT_PWR_OPMODE_TYPEC3_0:
102 case UCSI_CONSTAT_PWR_OPMODE_TYPEC1_5:
103 case UCSI_CONSTAT_PWR_OPMODE_BC:
104 case UCSI_CONSTAT_PWR_OPMODE_DEFAULT:
105 val->intval = UCSI_TYPEC_VSAFE5V * 1000;
106 break;
107 default:
108 val->intval = 0;
109 break;
110 }
111 return 0;
112 }
113
ucsi_psy_get_voltage_now(struct ucsi_connector * con,union power_supply_propval * val)114 static int ucsi_psy_get_voltage_now(struct ucsi_connector *con,
115 union power_supply_propval *val)
116 {
117 int index;
118 u32 pdo;
119
120 switch (UCSI_CONSTAT(con, PWR_OPMODE)) {
121 case UCSI_CONSTAT_PWR_OPMODE_PD:
122 index = rdo_index(con->rdo);
123 if (index > 0) {
124 pdo = con->src_pdos[index - 1];
125 val->intval = pdo_fixed_voltage(pdo) * 1000;
126 } else {
127 val->intval = 0;
128 }
129 break;
130 case UCSI_CONSTAT_PWR_OPMODE_TYPEC3_0:
131 case UCSI_CONSTAT_PWR_OPMODE_TYPEC1_5:
132 case UCSI_CONSTAT_PWR_OPMODE_BC:
133 case UCSI_CONSTAT_PWR_OPMODE_DEFAULT:
134 val->intval = UCSI_TYPEC_VSAFE5V * 1000;
135 break;
136 default:
137 val->intval = 0;
138 break;
139 }
140 return 0;
141 }
142
ucsi_psy_get_current_max(struct ucsi_connector * con,union power_supply_propval * val)143 static int ucsi_psy_get_current_max(struct ucsi_connector *con,
144 union power_supply_propval *val)
145 {
146 u32 pdo;
147
148 switch (UCSI_CONSTAT(con, PWR_OPMODE)) {
149 case UCSI_CONSTAT_PWR_OPMODE_PD:
150 if (con->num_pdos > 0) {
151 pdo = con->src_pdos[con->num_pdos - 1];
152 val->intval = pdo_max_current(pdo) * 1000;
153 } else {
154 val->intval = 0;
155 }
156 break;
157 case UCSI_CONSTAT_PWR_OPMODE_TYPEC1_5:
158 val->intval = UCSI_TYPEC_1_5_CURRENT * 1000;
159 break;
160 case UCSI_CONSTAT_PWR_OPMODE_TYPEC3_0:
161 val->intval = UCSI_TYPEC_3_0_CURRENT * 1000;
162 break;
163 case UCSI_CONSTAT_PWR_OPMODE_BC:
164 case UCSI_CONSTAT_PWR_OPMODE_DEFAULT:
165 /* UCSI can't tell b/w DCP/CDP or USB2/3x1/3x2 SDP chargers */
166 default:
167 val->intval = 0;
168 break;
169 }
170 return 0;
171 }
172
ucsi_psy_get_current_now(struct ucsi_connector * con,union power_supply_propval * val)173 static int ucsi_psy_get_current_now(struct ucsi_connector *con,
174 union power_supply_propval *val)
175 {
176 if (UCSI_CONSTAT(con, PWR_OPMODE) == UCSI_CONSTAT_PWR_OPMODE_PD)
177 val->intval = rdo_op_current(con->rdo) * 1000;
178 else
179 val->intval = 0;
180 return 0;
181 }
182
ucsi_psy_get_usb_type(struct ucsi_connector * con,union power_supply_propval * val)183 static int ucsi_psy_get_usb_type(struct ucsi_connector *con,
184 union power_supply_propval *val)
185 {
186 val->intval = POWER_SUPPLY_USB_TYPE_C;
187 if (UCSI_CONSTAT(con, CONNECTED) &&
188 UCSI_CONSTAT(con, PWR_OPMODE) == UCSI_CONSTAT_PWR_OPMODE_PD)
189 val->intval = POWER_SUPPLY_USB_TYPE_PD;
190
191 return 0;
192 }
193
ucsi_psy_get_charge_type(struct ucsi_connector * con,union power_supply_propval * val)194 static int ucsi_psy_get_charge_type(struct ucsi_connector *con, union power_supply_propval *val)
195 {
196 if (!(UCSI_CONSTAT(con, CONNECTED))) {
197 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
198 return 0;
199 }
200
201 /* The Battery Charging Cabability Status field is only valid in sink role. */
202 if (UCSI_CONSTAT(con, PWR_DIR) != TYPEC_SINK) {
203 val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
204 return 0;
205 }
206
207 switch (UCSI_CONSTAT(con, BC_STATUS)) {
208 case UCSI_CONSTAT_BC_NOMINAL_CHARGING:
209 val->intval = POWER_SUPPLY_CHARGE_TYPE_STANDARD;
210 break;
211 case UCSI_CONSTAT_BC_SLOW_CHARGING:
212 case UCSI_CONSTAT_BC_TRICKLE_CHARGING:
213 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
214 break;
215 default:
216 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
217 break;
218 }
219
220 return 0;
221 }
222
ucsi_psy_get_prop(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)223 static int ucsi_psy_get_prop(struct power_supply *psy,
224 enum power_supply_property psp,
225 union power_supply_propval *val)
226 {
227 struct ucsi_connector *con = power_supply_get_drvdata(psy);
228
229 switch (psp) {
230 case POWER_SUPPLY_PROP_CHARGE_TYPE:
231 return ucsi_psy_get_charge_type(con, val);
232 case POWER_SUPPLY_PROP_USB_TYPE:
233 return ucsi_psy_get_usb_type(con, val);
234 case POWER_SUPPLY_PROP_ONLINE:
235 return ucsi_psy_get_online(con, val);
236 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
237 return ucsi_psy_get_voltage_min(con, val);
238 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
239 return ucsi_psy_get_voltage_max(con, val);
240 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
241 return ucsi_psy_get_voltage_now(con, val);
242 case POWER_SUPPLY_PROP_CURRENT_MAX:
243 return ucsi_psy_get_current_max(con, val);
244 case POWER_SUPPLY_PROP_CURRENT_NOW:
245 return ucsi_psy_get_current_now(con, val);
246 case POWER_SUPPLY_PROP_SCOPE:
247 return ucsi_psy_get_scope(con, val);
248 default:
249 return -EINVAL;
250 }
251 }
252
ucsi_register_port_psy(struct ucsi_connector * con)253 int ucsi_register_port_psy(struct ucsi_connector *con)
254 {
255 struct power_supply_config psy_cfg = {};
256 struct device *dev = con->ucsi->dev;
257 char *psy_name;
258
259 psy_cfg.drv_data = con;
260 psy_cfg.fwnode = dev_fwnode(dev);
261
262 psy_name = devm_kasprintf(dev, GFP_KERNEL, "ucsi-source-psy-%s%d",
263 dev_name(dev), con->num);
264 if (!psy_name)
265 return -ENOMEM;
266
267 con->psy_desc.name = psy_name;
268 con->psy_desc.type = POWER_SUPPLY_TYPE_USB;
269 con->psy_desc.usb_types = BIT(POWER_SUPPLY_USB_TYPE_C) |
270 BIT(POWER_SUPPLY_USB_TYPE_PD) |
271 BIT(POWER_SUPPLY_USB_TYPE_PD_PPS);
272 con->psy_desc.properties = ucsi_psy_props;
273 con->psy_desc.num_properties = ARRAY_SIZE(ucsi_psy_props);
274 con->psy_desc.get_property = ucsi_psy_get_prop;
275
276 con->psy = power_supply_register(dev, &con->psy_desc, &psy_cfg);
277
278 return PTR_ERR_OR_ZERO(con->psy);
279 }
280
ucsi_unregister_port_psy(struct ucsi_connector * con)281 void ucsi_unregister_port_psy(struct ucsi_connector *con)
282 {
283 if (IS_ERR_OR_NULL(con->psy))
284 return;
285
286 power_supply_unregister(con->psy);
287 con->psy = NULL;
288 }
289
ucsi_port_psy_changed(struct ucsi_connector * con)290 void ucsi_port_psy_changed(struct ucsi_connector *con)
291 {
292 if (IS_ERR_OR_NULL(con->psy))
293 return;
294
295 power_supply_changed(con->psy);
296 }
297