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 .remove = pmbus_do_remove,
135 .id_table = pxe1610_id,
138 module_i2c_driver(pxe1610_driver);
140 MODULE_AUTHOR("Vijay Khemka <vijaykhemka@fb.com>");
141 MODULE_DESCRIPTION("PMBus driver for Infineon PXE1610, PXE1110 and PXM1310");
142 MODULE_LICENSE("GPL");