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61052652 VP |
1 | /* |
2 | * Hardware monitoring driver for Texas Instruments TPS53679 | |
3 | * | |
4 | * Copyright (c) 2017 Mellanox Technologies. All rights reserved. | |
5 | * Copyright (c) 2017 Vadim Pasternak <vadimp@mellanox.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | */ | |
17 | ||
18 | #include <linux/err.h> | |
19 | #include <linux/i2c.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/module.h> | |
23 | #include "pmbus.h" | |
24 | ||
25 | #define TPS53679_PROT_VR12_5MV 0x01 /* VR12.0 mode, 5-mV DAC */ | |
26 | #define TPS53679_PROT_VR12_5_10MV 0x02 /* VR12.5 mode, 10-mV DAC */ | |
27 | #define TPS53679_PROT_VR13_10MV 0x04 /* VR13.0 mode, 10-mV DAC */ | |
28 | #define TPS53679_PROT_IMVP8_5MV 0x05 /* IMVP8 mode, 5-mV DAC */ | |
29 | #define TPS53679_PROT_VR13_5MV 0x07 /* VR13.0 mode, 5-mV DAC */ | |
30 | #define TPS53679_PAGE_NUM 2 | |
31 | ||
32 | static int tps53679_identify(struct i2c_client *client, | |
33 | struct pmbus_driver_info *info) | |
34 | { | |
35 | u8 vout_params; | |
36 | int ret; | |
37 | ||
38 | /* Read the register with VOUT scaling value.*/ | |
39 | ret = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE); | |
40 | if (ret < 0) | |
41 | return ret; | |
42 | ||
43 | vout_params = ret & GENMASK(4, 0); | |
44 | ||
45 | switch (vout_params) { | |
46 | case TPS53679_PROT_VR13_10MV: | |
47 | case TPS53679_PROT_VR12_5_10MV: | |
48 | info->vrm_version = vr13; | |
49 | break; | |
50 | case TPS53679_PROT_VR13_5MV: | |
51 | case TPS53679_PROT_VR12_5MV: | |
52 | case TPS53679_PROT_IMVP8_5MV: | |
53 | info->vrm_version = vr12; | |
54 | break; | |
55 | default: | |
56 | return -EINVAL; | |
57 | } | |
58 | ||
59 | return 0; | |
60 | } | |
61 | ||
62 | static struct pmbus_driver_info tps53679_info = { | |
63 | .pages = TPS53679_PAGE_NUM, | |
64 | .format[PSC_VOLTAGE_IN] = linear, | |
65 | .format[PSC_VOLTAGE_OUT] = vid, | |
66 | .format[PSC_TEMPERATURE] = linear, | |
67 | .format[PSC_CURRENT_OUT] = linear, | |
68 | .format[PSC_POWER] = linear, | |
69 | .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | | |
70 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | | |
71 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | | |
72 | PMBUS_HAVE_POUT, | |
73 | .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | | |
74 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | | |
75 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | | |
76 | PMBUS_HAVE_POUT, | |
77 | .identify = tps53679_identify, | |
78 | }; | |
79 | ||
80 | static int tps53679_probe(struct i2c_client *client, | |
81 | const struct i2c_device_id *id) | |
82 | { | |
83 | return pmbus_do_probe(client, id, &tps53679_info); | |
84 | } | |
85 | ||
86 | static const struct i2c_device_id tps53679_id[] = { | |
87 | {"tps53679", 0}, | |
88 | {} | |
89 | }; | |
90 | ||
91 | MODULE_DEVICE_TABLE(i2c, tps53679_id); | |
92 | ||
93 | static const struct of_device_id tps53679_of_match[] = { | |
94 | {.compatible = "ti,tps53679"}, | |
95 | {} | |
96 | }; | |
97 | MODULE_DEVICE_TABLE(of, tps53679_of_match); | |
98 | ||
99 | static struct i2c_driver tps53679_driver = { | |
100 | .driver = { | |
101 | .name = "tps53679", | |
102 | .of_match_table = of_match_ptr(tps53679_of_match), | |
103 | }, | |
104 | .probe = tps53679_probe, | |
105 | .remove = pmbus_do_remove, | |
106 | .id_table = tps53679_id, | |
107 | }; | |
108 | ||
109 | module_i2c_driver(tps53679_driver); | |
110 | ||
111 | MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>"); | |
112 | MODULE_DESCRIPTION("PMBus driver for Texas Instruments TPS53679"); | |
113 | MODULE_LICENSE("GPL"); |