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8#include "common.h"
9
10enum scmi_sensor_protocol_cmd {
11 SENSOR_DESCRIPTION_GET = 0x3,
12 SENSOR_TRIP_POINT_NOTIFY = 0x4,
13 SENSOR_TRIP_POINT_CONFIG = 0x5,
14 SENSOR_READING_GET = 0x6,
15};
16
17enum scmi_sensor_protocol_notify {
18 SENSOR_TRIP_POINT_EVENT = 0x0,
19};
20
21struct scmi_msg_resp_sensor_attributes {
22 __le16 num_sensors;
23 u8 max_requests;
24 u8 reserved;
25 __le32 reg_addr_low;
26 __le32 reg_addr_high;
27 __le32 reg_size;
28};
29
30struct scmi_msg_resp_sensor_description {
31 __le16 num_returned;
32 __le16 num_remaining;
33 struct {
34 __le32 id;
35 __le32 attributes_low;
36#define SUPPORTS_ASYNC_READ(x) ((x) & BIT(31))
37#define NUM_TRIP_POINTS(x) ((x) & 0xff)
38 __le32 attributes_high;
39#define SENSOR_TYPE(x) ((x) & 0xff)
40#define SENSOR_SCALE(x) (((x) >> 11) & 0x1f)
41#define SENSOR_SCALE_SIGN BIT(4)
42#define SENSOR_SCALE_EXTEND GENMASK(7, 5)
43#define SENSOR_UPDATE_SCALE(x) (((x) >> 22) & 0x1f)
44#define SENSOR_UPDATE_BASE(x) (((x) >> 27) & 0x1f)
45 u8 name[SCMI_MAX_STR_SIZE];
46 } desc[0];
47};
48
49struct scmi_msg_sensor_trip_point_notify {
50 __le32 id;
51 __le32 event_control;
52#define SENSOR_TP_NOTIFY_ALL BIT(0)
53};
54
55struct scmi_msg_set_sensor_trip_point {
56 __le32 id;
57 __le32 event_control;
58#define SENSOR_TP_EVENT_MASK (0x3)
59#define SENSOR_TP_DISABLED 0x0
60#define SENSOR_TP_POSITIVE 0x1
61#define SENSOR_TP_NEGATIVE 0x2
62#define SENSOR_TP_BOTH 0x3
63#define SENSOR_TP_ID(x) (((x) & 0xff) << 4)
64 __le32 value_low;
65 __le32 value_high;
66};
67
68struct scmi_msg_sensor_reading_get {
69 __le32 id;
70 __le32 flags;
71#define SENSOR_READ_ASYNC BIT(0)
72};
73
74struct sensors_info {
75 u32 version;
76 int num_sensors;
77 int max_requests;
78 u64 reg_addr;
79 u32 reg_size;
80 struct scmi_sensor_info *sensors;
81};
82
83static int scmi_sensor_attributes_get(const struct scmi_handle *handle,
84 struct sensors_info *si)
85{
86 int ret;
87 struct scmi_xfer *t;
88 struct scmi_msg_resp_sensor_attributes *attr;
89
90 ret = scmi_xfer_get_init(handle, PROTOCOL_ATTRIBUTES,
91 SCMI_PROTOCOL_SENSOR, 0, sizeof(*attr), &t);
92 if (ret)
93 return ret;
94
95 attr = t->rx.buf;
96
97 ret = scmi_do_xfer(handle, t);
98 if (!ret) {
99 si->num_sensors = le16_to_cpu(attr->num_sensors);
100 si->max_requests = attr->max_requests;
101 si->reg_addr = le32_to_cpu(attr->reg_addr_low) |
102 (u64)le32_to_cpu(attr->reg_addr_high) << 32;
103 si->reg_size = le32_to_cpu(attr->reg_size);
104 }
105
106 scmi_xfer_put(handle, t);
107 return ret;
108}
109
110static int scmi_sensor_description_get(const struct scmi_handle *handle,
111 struct sensors_info *si)
112{
113 int ret, cnt;
114 u32 desc_index = 0;
115 u16 num_returned, num_remaining;
116 struct scmi_xfer *t;
117 struct scmi_msg_resp_sensor_description *buf;
118
119 ret = scmi_xfer_get_init(handle, SENSOR_DESCRIPTION_GET,
120 SCMI_PROTOCOL_SENSOR, sizeof(__le32), 0, &t);
121 if (ret)
122 return ret;
123
124 buf = t->rx.buf;
125
126 do {
127
128 put_unaligned_le32(desc_index, t->tx.buf);
129
130 ret = scmi_do_xfer(handle, t);
131 if (ret)
132 break;
133
134 num_returned = le16_to_cpu(buf->num_returned);
135 num_remaining = le16_to_cpu(buf->num_remaining);
136
137 if (desc_index + num_returned > si->num_sensors) {
138 dev_err(handle->dev, "No. of sensors can't exceed %d",
139 si->num_sensors);
140 break;
141 }
142
143 for (cnt = 0; cnt < num_returned; cnt++) {
144 u32 attrh, attrl;
145 struct scmi_sensor_info *s;
146
147 attrl = le32_to_cpu(buf->desc[cnt].attributes_low);
148 attrh = le32_to_cpu(buf->desc[cnt].attributes_high);
149 s = &si->sensors[desc_index + cnt];
150 s->id = le32_to_cpu(buf->desc[cnt].id);
151 s->type = SENSOR_TYPE(attrh);
152 s->scale = SENSOR_SCALE(attrh);
153
154 if (s->scale & SENSOR_SCALE_SIGN)
155 s->scale |= SENSOR_SCALE_EXTEND;
156 s->async = SUPPORTS_ASYNC_READ(attrl);
157 s->num_trip_points = NUM_TRIP_POINTS(attrl);
158 strlcpy(s->name, buf->desc[cnt].name, SCMI_MAX_STR_SIZE);
159 }
160
161 desc_index += num_returned;
162
163
164
165
166 } while (num_returned && num_remaining);
167
168 scmi_xfer_put(handle, t);
169 return ret;
170}
171
172static int scmi_sensor_trip_point_notify(const struct scmi_handle *handle,
173 u32 sensor_id, bool enable)
174{
175 int ret;
176 u32 evt_cntl = enable ? SENSOR_TP_NOTIFY_ALL : 0;
177 struct scmi_xfer *t;
178 struct scmi_msg_sensor_trip_point_notify *cfg;
179
180 ret = scmi_xfer_get_init(handle, SENSOR_TRIP_POINT_NOTIFY,
181 SCMI_PROTOCOL_SENSOR, sizeof(*cfg), 0, &t);
182 if (ret)
183 return ret;
184
185 cfg = t->tx.buf;
186 cfg->id = cpu_to_le32(sensor_id);
187 cfg->event_control = cpu_to_le32(evt_cntl);
188
189 ret = scmi_do_xfer(handle, t);
190
191 scmi_xfer_put(handle, t);
192 return ret;
193}
194
195static int
196scmi_sensor_trip_point_config(const struct scmi_handle *handle, u32 sensor_id,
197 u8 trip_id, u64 trip_value)
198{
199 int ret;
200 u32 evt_cntl = SENSOR_TP_BOTH;
201 struct scmi_xfer *t;
202 struct scmi_msg_set_sensor_trip_point *trip;
203
204 ret = scmi_xfer_get_init(handle, SENSOR_TRIP_POINT_CONFIG,
205 SCMI_PROTOCOL_SENSOR, sizeof(*trip), 0, &t);
206 if (ret)
207 return ret;
208
209 trip = t->tx.buf;
210 trip->id = cpu_to_le32(sensor_id);
211 trip->event_control = cpu_to_le32(evt_cntl | SENSOR_TP_ID(trip_id));
212 trip->value_low = cpu_to_le32(trip_value & 0xffffffff);
213 trip->value_high = cpu_to_le32(trip_value >> 32);
214
215 ret = scmi_do_xfer(handle, t);
216
217 scmi_xfer_put(handle, t);
218 return ret;
219}
220
221static int scmi_sensor_reading_get(const struct scmi_handle *handle,
222 u32 sensor_id, u64 *value)
223{
224 int ret;
225 struct scmi_xfer *t;
226 struct scmi_msg_sensor_reading_get *sensor;
227 struct sensors_info *si = handle->sensor_priv;
228 struct scmi_sensor_info *s = si->sensors + sensor_id;
229
230 ret = scmi_xfer_get_init(handle, SENSOR_READING_GET,
231 SCMI_PROTOCOL_SENSOR, sizeof(*sensor),
232 sizeof(u64), &t);
233 if (ret)
234 return ret;
235
236 sensor = t->tx.buf;
237 sensor->id = cpu_to_le32(sensor_id);
238
239 if (s->async) {
240 sensor->flags = cpu_to_le32(SENSOR_READ_ASYNC);
241 ret = scmi_do_xfer_with_response(handle, t);
242 if (!ret)
243 *value = get_unaligned_le64((void *)
244 ((__le32 *)t->rx.buf + 1));
245 } else {
246 sensor->flags = cpu_to_le32(0);
247 ret = scmi_do_xfer(handle, t);
248 if (!ret)
249 *value = get_unaligned_le64(t->rx.buf);
250 }
251
252 scmi_xfer_put(handle, t);
253 return ret;
254}
255
256static const struct scmi_sensor_info *
257scmi_sensor_info_get(const struct scmi_handle *handle, u32 sensor_id)
258{
259 struct sensors_info *si = handle->sensor_priv;
260
261 return si->sensors + sensor_id;
262}
263
264static int scmi_sensor_count_get(const struct scmi_handle *handle)
265{
266 struct sensors_info *si = handle->sensor_priv;
267
268 return si->num_sensors;
269}
270
271static struct scmi_sensor_ops sensor_ops = {
272 .count_get = scmi_sensor_count_get,
273 .info_get = scmi_sensor_info_get,
274 .trip_point_notify = scmi_sensor_trip_point_notify,
275 .trip_point_config = scmi_sensor_trip_point_config,
276 .reading_get = scmi_sensor_reading_get,
277};
278
279static int scmi_sensors_protocol_init(struct scmi_handle *handle)
280{
281 u32 version;
282 struct sensors_info *sinfo;
283
284 scmi_version_get(handle, SCMI_PROTOCOL_SENSOR, &version);
285
286 dev_dbg(handle->dev, "Sensor Version %d.%d\n",
287 PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
288
289 sinfo = devm_kzalloc(handle->dev, sizeof(*sinfo), GFP_KERNEL);
290 if (!sinfo)
291 return -ENOMEM;
292
293 scmi_sensor_attributes_get(handle, sinfo);
294
295 sinfo->sensors = devm_kcalloc(handle->dev, sinfo->num_sensors,
296 sizeof(*sinfo->sensors), GFP_KERNEL);
297 if (!sinfo->sensors)
298 return -ENOMEM;
299
300 scmi_sensor_description_get(handle, sinfo);
301
302 sinfo->version = version;
303 handle->sensor_ops = &sensor_ops;
304 handle->sensor_priv = sinfo;
305
306 return 0;
307}
308
309static int __init scmi_sensors_init(void)
310{
311 return scmi_protocol_register(SCMI_PROTOCOL_SENSOR,
312 &scmi_sensors_protocol_init);
313}
314subsys_initcall(scmi_sensors_init);
315
