1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Hardware monitoring driver for Vicor PLI1209BC Digital Supervisor
4 *
5 * Copyright (c) 2022 9elements GmbH
6 */
7
8 #include <linux/delay.h>
9 #include <linux/i2c.h>
10 #include <linux/module.h>
11 #include <linux/pmbus.h>
12 #include <linux/regulator/driver.h>
13 #include "pmbus.h"
14
15 /*
16 * The capability command is only supported at page 0. Probing the device while
17 * the page register is set to 1 will falsely enable PEC support. Disable
18 * capability probing accordingly, since the PLI1209BC does not have any
19 * additional capabilities.
20 */
21 static struct pmbus_platform_data pli1209bc_plat_data = {
22 .flags = PMBUS_NO_CAPABILITY,
23 };
24
pli1209bc_read_word_data(struct i2c_client * client,int page,int phase,int reg)25 static int pli1209bc_read_word_data(struct i2c_client *client, int page,
26 int phase, int reg)
27 {
28 int data;
29
30 switch (reg) {
31 /* PMBUS_READ_POUT uses a direct format with R=0 */
32 case PMBUS_READ_POUT:
33 data = pmbus_read_word_data(client, page, phase, reg);
34 if (data < 0)
35 return data;
36 data = sign_extend32(data, 15) * 10;
37 return clamp_val(data, -32768, 32767) & 0xffff;
38 /*
39 * PMBUS_READ_VOUT and PMBUS_READ_TEMPERATURE_1 return invalid data
40 * when the BCM is turned off. Since it is not possible to return
41 * ENODATA error, return zero instead.
42 */
43 case PMBUS_READ_VOUT:
44 case PMBUS_READ_TEMPERATURE_1:
45 data = pmbus_read_word_data(client, page, phase,
46 PMBUS_STATUS_WORD);
47 if (data < 0)
48 return data;
49 if (data & PB_STATUS_POWER_GOOD_N)
50 return 0;
51 return pmbus_read_word_data(client, page, phase, reg);
52 default:
53 return -ENODATA;
54 }
55 }
56
57 #if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR)
58 static const struct regulator_desc pli1209bc_reg_desc = {
59 .name = "vout2",
60 .id = 1,
61 .of_match = of_match_ptr("vout2"),
62 .regulators_node = of_match_ptr("regulators"),
63 .ops = &pmbus_regulator_ops,
64 .type = REGULATOR_VOLTAGE,
65 .owner = THIS_MODULE,
66 };
67 #endif
68
69 static struct pmbus_driver_info pli1209bc_info = {
70 .pages = 2,
71 .format[PSC_VOLTAGE_IN] = direct,
72 .format[PSC_VOLTAGE_OUT] = direct,
73 .format[PSC_CURRENT_IN] = direct,
74 .format[PSC_CURRENT_OUT] = direct,
75 .format[PSC_POWER] = direct,
76 .format[PSC_TEMPERATURE] = direct,
77 .m[PSC_VOLTAGE_IN] = 1,
78 .b[PSC_VOLTAGE_IN] = 0,
79 .R[PSC_VOLTAGE_IN] = 1,
80 .m[PSC_VOLTAGE_OUT] = 1,
81 .b[PSC_VOLTAGE_OUT] = 0,
82 .R[PSC_VOLTAGE_OUT] = 1,
83 .m[PSC_CURRENT_IN] = 1,
84 .b[PSC_CURRENT_IN] = 0,
85 .R[PSC_CURRENT_IN] = 3,
86 .m[PSC_CURRENT_OUT] = 1,
87 .b[PSC_CURRENT_OUT] = 0,
88 .R[PSC_CURRENT_OUT] = 2,
89 .m[PSC_POWER] = 1,
90 .b[PSC_POWER] = 0,
91 .R[PSC_POWER] = 1,
92 .m[PSC_TEMPERATURE] = 1,
93 .b[PSC_TEMPERATURE] = 0,
94 .R[PSC_TEMPERATURE] = 0,
95 /*
96 * Page 0 sums up all attributes except voltage readings.
97 * The pli1209 digital supervisor only contains a single BCM, making
98 * page 0 redundant.
99 */
100 .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT
101 | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT
102 | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT
103 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
104 | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT,
105 .read_word_data = pli1209bc_read_word_data,
106 .write_delay = 250,
107 #if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR)
108 .num_regulators = 1,
109 .reg_desc = &pli1209bc_reg_desc,
110 #endif
111 };
112
pli1209bc_probe(struct i2c_client * client)113 static int pli1209bc_probe(struct i2c_client *client)
114 {
115 client->dev.platform_data = &pli1209bc_plat_data;
116 return pmbus_do_probe(client, &pli1209bc_info);
117 }
118
119 static const struct i2c_device_id pli1209bc_id[] = {
120 {"pli1209bc"},
121 {}
122 };
123
124 MODULE_DEVICE_TABLE(i2c, pli1209bc_id);
125
126 #ifdef CONFIG_OF
127 static const struct of_device_id pli1209bc_of_match[] = {
128 { .compatible = "vicor,pli1209bc" },
129 { },
130 };
131 MODULE_DEVICE_TABLE(of, pli1209bc_of_match);
132 #endif
133
134 static struct i2c_driver pli1209bc_driver = {
135 .driver = {
136 .name = "pli1209bc",
137 .of_match_table = of_match_ptr(pli1209bc_of_match),
138 },
139 .probe = pli1209bc_probe,
140 .id_table = pli1209bc_id,
141 };
142
143 module_i2c_driver(pli1209bc_driver);
144
145 MODULE_AUTHOR("Marcello Sylvester Bauer <sylv@sylv.io>");
146 MODULE_DESCRIPTION("PMBus driver for Vicor PLI1209BC");
147 MODULE_LICENSE("GPL");
148 MODULE_IMPORT_NS(PMBUS);
149