1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Hardware monitoring driver for Renesas Digital Multiphase Voltage Regulators
4 *
5 * Copyright (c) 2017 Google Inc
6 * Copyright (c) 2020 Renesas Electronics America
7 *
8 */
9
10 #include <linux/err.h>
11 #include <linux/hwmon-sysfs.h>
12 #include <linux/i2c.h>
13 #include <linux/init.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/string.h>
17 #include <linux/sysfs.h>
18
19 #include "pmbus.h"
20
21 #define ISL68137_VOUT_AVS 0x30
22 #define RAA_DMPVR2_READ_VMON 0xc8
23
24 enum chips {
25 isl68137,
26 isl68220,
27 isl68221,
28 isl68222,
29 isl68223,
30 isl68224,
31 isl68225,
32 isl68226,
33 isl68227,
34 isl68229,
35 isl68233,
36 isl68239,
37 isl69222,
38 isl69223,
39 isl69224,
40 isl69225,
41 isl69227,
42 isl69228,
43 isl69234,
44 isl69236,
45 isl69239,
46 isl69242,
47 isl69243,
48 isl69247,
49 isl69248,
50 isl69254,
51 isl69255,
52 isl69256,
53 isl69259,
54 isl69260,
55 isl69268,
56 isl69269,
57 isl69298,
58 raa228000,
59 raa228004,
60 raa228006,
61 raa228228,
62 raa229001,
63 raa229004,
64 };
65
66 enum variants {
67 raa_dmpvr1_2rail,
68 raa_dmpvr2_1rail,
69 raa_dmpvr2_2rail,
70 raa_dmpvr2_2rail_nontc,
71 raa_dmpvr2_3rail,
72 raa_dmpvr2_hv,
73 };
74
75 static const struct i2c_device_id raa_dmpvr_id[];
76
isl68137_avs_enable_show_page(struct i2c_client * client,int page,char * buf)77 static ssize_t isl68137_avs_enable_show_page(struct i2c_client *client,
78 int page,
79 char *buf)
80 {
81 int val = pmbus_read_byte_data(client, page, PMBUS_OPERATION);
82
83 return sprintf(buf, "%d\n",
84 (val & ISL68137_VOUT_AVS) == ISL68137_VOUT_AVS ? 1 : 0);
85 }
86
isl68137_avs_enable_store_page(struct i2c_client * client,int page,const char * buf,size_t count)87 static ssize_t isl68137_avs_enable_store_page(struct i2c_client *client,
88 int page,
89 const char *buf, size_t count)
90 {
91 int rc, op_val;
92 bool result;
93
94 rc = kstrtobool(buf, &result);
95 if (rc)
96 return rc;
97
98 op_val = result ? ISL68137_VOUT_AVS : 0;
99
100 /*
101 * Writes to VOUT setpoint over AVSBus will persist after the VRM is
102 * switched to PMBus control. Switching back to AVSBus control
103 * restores this persisted setpoint rather than re-initializing to
104 * PMBus VOUT_COMMAND. Writing VOUT_COMMAND first over PMBus before
105 * enabling AVS control is the workaround.
106 */
107 if (op_val == ISL68137_VOUT_AVS) {
108 rc = pmbus_read_word_data(client, page, 0xff,
109 PMBUS_VOUT_COMMAND);
110 if (rc < 0)
111 return rc;
112
113 rc = pmbus_write_word_data(client, page, PMBUS_VOUT_COMMAND,
114 rc);
115 if (rc < 0)
116 return rc;
117 }
118
119 rc = pmbus_update_byte_data(client, page, PMBUS_OPERATION,
120 ISL68137_VOUT_AVS, op_val);
121
122 return (rc < 0) ? rc : count;
123 }
124
isl68137_avs_enable_show(struct device * dev,struct device_attribute * devattr,char * buf)125 static ssize_t isl68137_avs_enable_show(struct device *dev,
126 struct device_attribute *devattr,
127 char *buf)
128 {
129 struct i2c_client *client = to_i2c_client(dev->parent);
130 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
131
132 return isl68137_avs_enable_show_page(client, attr->index, buf);
133 }
134
isl68137_avs_enable_store(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)135 static ssize_t isl68137_avs_enable_store(struct device *dev,
136 struct device_attribute *devattr,
137 const char *buf, size_t count)
138 {
139 struct i2c_client *client = to_i2c_client(dev->parent);
140 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
141
142 return isl68137_avs_enable_store_page(client, attr->index, buf, count);
143 }
144
145 static SENSOR_DEVICE_ATTR_RW(avs0_enable, isl68137_avs_enable, 0);
146 static SENSOR_DEVICE_ATTR_RW(avs1_enable, isl68137_avs_enable, 1);
147
148 static struct attribute *enable_attrs[] = {
149 &sensor_dev_attr_avs0_enable.dev_attr.attr,
150 &sensor_dev_attr_avs1_enable.dev_attr.attr,
151 NULL,
152 };
153
154 static const struct attribute_group enable_group = {
155 .attrs = enable_attrs,
156 };
157
158 static const struct attribute_group *isl68137_attribute_groups[] = {
159 &enable_group,
160 NULL,
161 };
162
raa_dmpvr2_read_word_data(struct i2c_client * client,int page,int phase,int reg)163 static int raa_dmpvr2_read_word_data(struct i2c_client *client, int page,
164 int phase, int reg)
165 {
166 int ret;
167
168 switch (reg) {
169 case PMBUS_VIRT_READ_VMON:
170 ret = pmbus_read_word_data(client, page, phase,
171 RAA_DMPVR2_READ_VMON);
172 break;
173 default:
174 ret = -ENODATA;
175 break;
176 }
177
178 return ret;
179 }
180
181 static struct pmbus_driver_info raa_dmpvr_info = {
182 .pages = 3,
183 .format[PSC_VOLTAGE_IN] = direct,
184 .format[PSC_VOLTAGE_OUT] = direct,
185 .format[PSC_CURRENT_IN] = direct,
186 .format[PSC_CURRENT_OUT] = direct,
187 .format[PSC_POWER] = direct,
188 .format[PSC_TEMPERATURE] = direct,
189 .m[PSC_VOLTAGE_IN] = 1,
190 .b[PSC_VOLTAGE_IN] = 0,
191 .R[PSC_VOLTAGE_IN] = 2,
192 .m[PSC_VOLTAGE_OUT] = 1,
193 .b[PSC_VOLTAGE_OUT] = 0,
194 .R[PSC_VOLTAGE_OUT] = 3,
195 .m[PSC_CURRENT_IN] = 1,
196 .b[PSC_CURRENT_IN] = 0,
197 .R[PSC_CURRENT_IN] = 2,
198 .m[PSC_CURRENT_OUT] = 1,
199 .b[PSC_CURRENT_OUT] = 0,
200 .R[PSC_CURRENT_OUT] = 1,
201 .m[PSC_POWER] = 1,
202 .b[PSC_POWER] = 0,
203 .R[PSC_POWER] = 0,
204 .m[PSC_TEMPERATURE] = 1,
205 .b[PSC_TEMPERATURE] = 0,
206 .R[PSC_TEMPERATURE] = 0,
207 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
208 | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
209 | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP
210 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
211 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT
212 | PMBUS_HAVE_VMON,
213 .func[1] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT
214 | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP
215 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_IOUT
216 | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
217 .func[2] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT
218 | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP
219 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_IOUT
220 | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
221 };
222
isl68137_probe(struct i2c_client * client)223 static int isl68137_probe(struct i2c_client *client)
224 {
225 struct pmbus_driver_info *info;
226
227 info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);
228 if (!info)
229 return -ENOMEM;
230 memcpy(info, &raa_dmpvr_info, sizeof(*info));
231
232 switch (i2c_match_id(raa_dmpvr_id, client)->driver_data) {
233 case raa_dmpvr1_2rail:
234 info->pages = 2;
235 info->R[PSC_VOLTAGE_IN] = 3;
236 info->func[0] &= ~PMBUS_HAVE_VMON;
237 info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
238 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
239 | PMBUS_HAVE_POUT;
240 info->groups = isl68137_attribute_groups;
241 break;
242 case raa_dmpvr2_1rail:
243 info->pages = 1;
244 info->read_word_data = raa_dmpvr2_read_word_data;
245 break;
246 case raa_dmpvr2_2rail_nontc:
247 info->func[0] &= ~PMBUS_HAVE_TEMP3;
248 info->func[1] &= ~PMBUS_HAVE_TEMP3;
249 fallthrough;
250 case raa_dmpvr2_2rail:
251 info->pages = 2;
252 info->read_word_data = raa_dmpvr2_read_word_data;
253 break;
254 case raa_dmpvr2_3rail:
255 info->read_word_data = raa_dmpvr2_read_word_data;
256 break;
257 case raa_dmpvr2_hv:
258 info->pages = 1;
259 info->R[PSC_VOLTAGE_IN] = 1;
260 info->m[PSC_VOLTAGE_OUT] = 2;
261 info->R[PSC_VOLTAGE_OUT] = 2;
262 info->m[PSC_CURRENT_IN] = 2;
263 info->m[PSC_POWER] = 2;
264 info->R[PSC_POWER] = -1;
265 info->read_word_data = raa_dmpvr2_read_word_data;
266 break;
267 default:
268 return -ENODEV;
269 }
270
271 return pmbus_do_probe(client, info);
272 }
273
274 static const struct i2c_device_id raa_dmpvr_id[] = {
275 {"isl68137", raa_dmpvr1_2rail},
276 {"isl68220", raa_dmpvr2_2rail},
277 {"isl68221", raa_dmpvr2_3rail},
278 {"isl68222", raa_dmpvr2_2rail},
279 {"isl68223", raa_dmpvr2_2rail},
280 {"isl68224", raa_dmpvr2_3rail},
281 {"isl68225", raa_dmpvr2_2rail},
282 {"isl68226", raa_dmpvr2_3rail},
283 {"isl68227", raa_dmpvr2_1rail},
284 {"isl68229", raa_dmpvr2_3rail},
285 {"isl68233", raa_dmpvr2_2rail},
286 {"isl68239", raa_dmpvr2_3rail},
287
288 {"isl69222", raa_dmpvr2_2rail},
289 {"isl69223", raa_dmpvr2_3rail},
290 {"isl69224", raa_dmpvr2_2rail},
291 {"isl69225", raa_dmpvr2_2rail},
292 {"isl69227", raa_dmpvr2_3rail},
293 {"isl69228", raa_dmpvr2_3rail},
294 {"isl69234", raa_dmpvr2_2rail},
295 {"isl69236", raa_dmpvr2_2rail},
296 {"isl69239", raa_dmpvr2_3rail},
297 {"isl69242", raa_dmpvr2_2rail},
298 {"isl69243", raa_dmpvr2_1rail},
299 {"isl69247", raa_dmpvr2_2rail},
300 {"isl69248", raa_dmpvr2_2rail},
301 {"isl69254", raa_dmpvr2_2rail},
302 {"isl69255", raa_dmpvr2_2rail},
303 {"isl69256", raa_dmpvr2_2rail},
304 {"isl69259", raa_dmpvr2_2rail},
305 {"isl69260", raa_dmpvr2_2rail},
306 {"isl69268", raa_dmpvr2_2rail},
307 {"isl69269", raa_dmpvr2_3rail},
308 {"isl69298", raa_dmpvr2_2rail},
309
310 {"raa228000", raa_dmpvr2_hv},
311 {"raa228004", raa_dmpvr2_hv},
312 {"raa228006", raa_dmpvr2_hv},
313 {"raa228228", raa_dmpvr2_2rail_nontc},
314 {"raa229001", raa_dmpvr2_2rail},
315 {"raa229004", raa_dmpvr2_2rail},
316 {}
317 };
318
319 MODULE_DEVICE_TABLE(i2c, raa_dmpvr_id);
320
321 /* This is the driver that will be inserted */
322 static struct i2c_driver isl68137_driver = {
323 .driver = {
324 .name = "isl68137",
325 },
326 .probe = isl68137_probe,
327 .id_table = raa_dmpvr_id,
328 };
329
330 module_i2c_driver(isl68137_driver);
331
332 MODULE_AUTHOR("Maxim Sloyko <maxims@google.com>");
333 MODULE_DESCRIPTION("PMBus driver for Renesas digital multiphase voltage regulators");
334 MODULE_LICENSE("GPL");
335 MODULE_IMPORT_NS(PMBUS);
336