1344757baSVijay Khemka // SPDX-License-Identifier: GPL-2.0+
2344757baSVijay Khemka /*
3344757baSVijay Khemka * Hardware monitoring driver for Infineon PXE1610
4344757baSVijay Khemka *
5344757baSVijay Khemka * Copyright (c) 2019 Facebook Inc
6344757baSVijay Khemka *
7344757baSVijay Khemka */
8344757baSVijay Khemka
9344757baSVijay Khemka #include <linux/err.h>
10344757baSVijay Khemka #include <linux/i2c.h>
11344757baSVijay Khemka #include <linux/init.h>
12344757baSVijay Khemka #include <linux/kernel.h>
13344757baSVijay Khemka #include <linux/module.h>
14344757baSVijay Khemka #include "pmbus.h"
15344757baSVijay Khemka
16344757baSVijay Khemka #define PXE1610_NUM_PAGES 3
17344757baSVijay Khemka
18344757baSVijay Khemka /* Identify chip parameters. */
pxe1610_identify(struct i2c_client * client,struct pmbus_driver_info * info)19344757baSVijay Khemka static int pxe1610_identify(struct i2c_client *client,
20344757baSVijay Khemka struct pmbus_driver_info *info)
21344757baSVijay Khemka {
22b9fa0a3aSVadim Pasternak int i;
23b9fa0a3aSVadim Pasternak
24b9fa0a3aSVadim Pasternak for (i = 0; i < PXE1610_NUM_PAGES; i++) {
25b9fa0a3aSVadim Pasternak if (pmbus_check_byte_register(client, i, PMBUS_VOUT_MODE)) {
26344757baSVijay Khemka u8 vout_mode;
27344757baSVijay Khemka int ret;
28344757baSVijay Khemka
29344757baSVijay Khemka /* Read the register with VOUT scaling value.*/
30b9fa0a3aSVadim Pasternak ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE);
31344757baSVijay Khemka if (ret < 0)
32344757baSVijay Khemka return ret;
33344757baSVijay Khemka
34344757baSVijay Khemka vout_mode = ret & GENMASK(4, 0);
35344757baSVijay Khemka
36344757baSVijay Khemka switch (vout_mode) {
37344757baSVijay Khemka case 1:
38b9fa0a3aSVadim Pasternak info->vrm_version[i] = vr12;
39344757baSVijay Khemka break;
40344757baSVijay Khemka case 2:
41b9fa0a3aSVadim Pasternak info->vrm_version[i] = vr13;
42344757baSVijay Khemka break;
43344757baSVijay Khemka default:
44f0253143SPaul Fertser /*
45f0253143SPaul Fertser * If prior pages are available limit operation
46f0253143SPaul Fertser * to them
47f0253143SPaul Fertser */
48f0253143SPaul Fertser if (i != 0) {
49f0253143SPaul Fertser info->pages = i;
50f0253143SPaul Fertser return 0;
51f0253143SPaul Fertser }
52f0253143SPaul Fertser
53344757baSVijay Khemka return -ENODEV;
54344757baSVijay Khemka }
55344757baSVijay Khemka }
56b9fa0a3aSVadim Pasternak }
57344757baSVijay Khemka
58344757baSVijay Khemka return 0;
59344757baSVijay Khemka }
60344757baSVijay Khemka
61344757baSVijay Khemka static struct pmbus_driver_info pxe1610_info = {
62344757baSVijay Khemka .pages = PXE1610_NUM_PAGES,
63344757baSVijay Khemka .format[PSC_VOLTAGE_IN] = linear,
64344757baSVijay Khemka .format[PSC_VOLTAGE_OUT] = vid,
65344757baSVijay Khemka .format[PSC_CURRENT_IN] = linear,
66344757baSVijay Khemka .format[PSC_CURRENT_OUT] = linear,
67344757baSVijay Khemka .format[PSC_TEMPERATURE] = linear,
68344757baSVijay Khemka .format[PSC_POWER] = linear,
69344757baSVijay Khemka .func[0] = PMBUS_HAVE_VIN
70344757baSVijay Khemka | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
71344757baSVijay Khemka | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
72344757baSVijay Khemka | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
73344757baSVijay Khemka | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
74344757baSVijay Khemka | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
75344757baSVijay Khemka .func[1] = PMBUS_HAVE_VIN
76344757baSVijay Khemka | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
77344757baSVijay Khemka | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
78344757baSVijay Khemka | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
79344757baSVijay Khemka | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
80344757baSVijay Khemka | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
81344757baSVijay Khemka .func[2] = PMBUS_HAVE_VIN
82344757baSVijay Khemka | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
83344757baSVijay Khemka | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
84344757baSVijay Khemka | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
85344757baSVijay Khemka | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
86344757baSVijay Khemka | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
87344757baSVijay Khemka .identify = pxe1610_identify,
88344757baSVijay Khemka };
89344757baSVijay Khemka
pxe1610_probe(struct i2c_client * client)90dd431939SStephen Kitt static int pxe1610_probe(struct i2c_client *client)
91344757baSVijay Khemka {
92344757baSVijay Khemka struct pmbus_driver_info *info;
93344757baSVijay Khemka u8 buf[I2C_SMBUS_BLOCK_MAX];
94344757baSVijay Khemka int ret;
95344757baSVijay Khemka
96344757baSVijay Khemka if (!i2c_check_functionality(
97344757baSVijay Khemka client->adapter,
98344757baSVijay Khemka I2C_FUNC_SMBUS_READ_BYTE_DATA
99344757baSVijay Khemka | I2C_FUNC_SMBUS_READ_WORD_DATA
100344757baSVijay Khemka | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
101344757baSVijay Khemka return -ENODEV;
102344757baSVijay Khemka
103344757baSVijay Khemka /*
104344757baSVijay Khemka * By default this device doesn't boot to page 0, so set page 0
105344757baSVijay Khemka * to access all pmbus registers.
106344757baSVijay Khemka */
107344757baSVijay Khemka i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
108344757baSVijay Khemka
109344757baSVijay Khemka /* Read Manufacturer id */
110344757baSVijay Khemka ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
111344757baSVijay Khemka if (ret < 0) {
112344757baSVijay Khemka dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
113344757baSVijay Khemka return ret;
114344757baSVijay Khemka }
115344757baSVijay Khemka if (ret != 2 || strncmp(buf, "XP", 2)) {
116344757baSVijay Khemka dev_err(&client->dev, "MFR_ID unrecognized\n");
117344757baSVijay Khemka return -ENODEV;
118344757baSVijay Khemka }
119344757baSVijay Khemka
120344757baSVijay Khemka info = devm_kmemdup(&client->dev, &pxe1610_info,
121344757baSVijay Khemka sizeof(struct pmbus_driver_info),
122344757baSVijay Khemka GFP_KERNEL);
123344757baSVijay Khemka if (!info)
124344757baSVijay Khemka return -ENOMEM;
125344757baSVijay Khemka
126dd431939SStephen Kitt return pmbus_do_probe(client, info);
127344757baSVijay Khemka }
128344757baSVijay Khemka
129344757baSVijay Khemka static const struct i2c_device_id pxe1610_id[] = {
130*d8a66f36SUwe Kleine-König {"pxe1610"},
131*d8a66f36SUwe Kleine-König {"pxe1110"},
132*d8a66f36SUwe Kleine-König {"pxm1310"},
133344757baSVijay Khemka {}
134344757baSVijay Khemka };
135344757baSVijay Khemka
136344757baSVijay Khemka MODULE_DEVICE_TABLE(i2c, pxe1610_id);
137344757baSVijay Khemka
138344757baSVijay Khemka static struct i2c_driver pxe1610_driver = {
139344757baSVijay Khemka .driver = {
140344757baSVijay Khemka .name = "pxe1610",
141344757baSVijay Khemka },
1421975d167SUwe Kleine-König .probe = pxe1610_probe,
143344757baSVijay Khemka .id_table = pxe1610_id,
144344757baSVijay Khemka };
145344757baSVijay Khemka
146344757baSVijay Khemka module_i2c_driver(pxe1610_driver);
147344757baSVijay Khemka
148344757baSVijay Khemka MODULE_AUTHOR("Vijay Khemka <vijaykhemka@fb.com>");
149344757baSVijay Khemka MODULE_DESCRIPTION("PMBus driver for Infineon PXE1610, PXE1110 and PXM1310");
150344757baSVijay Khemka MODULE_LICENSE("GPL");
151b94ca77eSGuenter Roeck MODULE_IMPORT_NS(PMBUS);
152