1 // SPDX-License-Identifier: GPL-2.0+
3 * Hardware monitoring driver for Infineon PXE1610
5 * Copyright (c) 2019 Facebook Inc
10 #include <linux/i2c.h>
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
16 #define PXE1610_NUM_PAGES 3
18 /* Identify chip parameters. */
19 static int pxe1610_identify(struct i2c_client
*client
,
20 struct pmbus_driver_info
*info
)
24 for (i
= 0; i
< PXE1610_NUM_PAGES
; i
++) {
25 if (pmbus_check_byte_register(client
, i
, PMBUS_VOUT_MODE
)) {
29 /* Read the register with VOUT scaling value.*/
30 ret
= pmbus_read_byte_data(client
, i
, PMBUS_VOUT_MODE
);
34 vout_mode
= ret
& GENMASK(4, 0);
38 info
->vrm_version
[i
] = vr12
;
41 info
->vrm_version
[i
] = vr13
;
52 static struct pmbus_driver_info pxe1610_info
= {
53 .pages
= PXE1610_NUM_PAGES
,
54 .format
[PSC_VOLTAGE_IN
] = linear
,
55 .format
[PSC_VOLTAGE_OUT
] = vid
,
56 .format
[PSC_CURRENT_IN
] = linear
,
57 .format
[PSC_CURRENT_OUT
] = linear
,
58 .format
[PSC_TEMPERATURE
] = linear
,
59 .format
[PSC_POWER
] = linear
,
60 .func
[0] = PMBUS_HAVE_VIN
61 | PMBUS_HAVE_VOUT
| PMBUS_HAVE_IIN
62 | PMBUS_HAVE_IOUT
| PMBUS_HAVE_PIN
63 | PMBUS_HAVE_POUT
| PMBUS_HAVE_TEMP
64 | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_STATUS_IOUT
65 | PMBUS_HAVE_STATUS_INPUT
| PMBUS_HAVE_STATUS_TEMP
,
66 .func
[1] = PMBUS_HAVE_VIN
67 | PMBUS_HAVE_VOUT
| PMBUS_HAVE_IIN
68 | PMBUS_HAVE_IOUT
| PMBUS_HAVE_PIN
69 | PMBUS_HAVE_POUT
| PMBUS_HAVE_TEMP
70 | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_STATUS_IOUT
71 | PMBUS_HAVE_STATUS_INPUT
| PMBUS_HAVE_STATUS_TEMP
,
72 .func
[2] = PMBUS_HAVE_VIN
73 | PMBUS_HAVE_VOUT
| PMBUS_HAVE_IIN
74 | PMBUS_HAVE_IOUT
| PMBUS_HAVE_PIN
75 | PMBUS_HAVE_POUT
| PMBUS_HAVE_TEMP
76 | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_STATUS_IOUT
77 | PMBUS_HAVE_STATUS_INPUT
| PMBUS_HAVE_STATUS_TEMP
,
78 .identify
= pxe1610_identify
,
81 static int pxe1610_probe(struct i2c_client
*client
)
83 struct pmbus_driver_info
*info
;
84 u8 buf
[I2C_SMBUS_BLOCK_MAX
];
87 if (!i2c_check_functionality(
89 I2C_FUNC_SMBUS_READ_BYTE_DATA
90 | I2C_FUNC_SMBUS_READ_WORD_DATA
91 | I2C_FUNC_SMBUS_READ_BLOCK_DATA
))
95 * By default this device doesn't boot to page 0, so set page 0
96 * to access all pmbus registers.
98 i2c_smbus_write_byte_data(client
, PMBUS_PAGE
, 0);
100 /* Read Manufacturer id */
101 ret
= i2c_smbus_read_block_data(client
, PMBUS_MFR_ID
, buf
);
103 dev_err(&client
->dev
, "Failed to read PMBUS_MFR_ID\n");
106 if (ret
!= 2 || strncmp(buf
, "XP", 2)) {
107 dev_err(&client
->dev
, "MFR_ID unrecognized\n");
111 info
= devm_kmemdup(&client
->dev
, &pxe1610_info
,
112 sizeof(struct pmbus_driver_info
),
117 return pmbus_do_probe(client
, info
);
120 static const struct i2c_device_id pxe1610_id
[] = {
127 MODULE_DEVICE_TABLE(i2c
, pxe1610_id
);
129 static struct i2c_driver pxe1610_driver
= {
133 .probe_new
= pxe1610_probe
,
134 .id_table
= pxe1610_id
,
137 module_i2c_driver(pxe1610_driver
);
139 MODULE_AUTHOR("Vijay Khemka <vijaykhemka@fb.com>");
140 MODULE_DESCRIPTION("PMBus driver for Infineon PXE1610, PXE1110 and PXM1310");
141 MODULE_LICENSE("GPL");