1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Driver for Infineon XDP710 Hot-Swap Controller
4 */
5
6#include <linux/bitops.h>
7#include <linux/i2c.h>
8#include <linux/module.h>
9#include <linux/of_device.h>
10#include "pmbus.h"
11
12#define XDP710_REG_CFG		0xD3
13#define XDP710_V_SNS_CFG	0xD4
14#define XDP710_CS_RNG		0xD5
15
16/*
17 * The table to map configuration register values
18 * to sense resistor values
19 */
20static const int micro_ohm_rsense[] = {
21	200, 250, 300, 330, 400, 470, 500, 600,
22	670, 700, 750, 800, 900, 1000, 1100, 1200,
23	1250, 1300, 1400, 1500, 1600, 1700, 1800, 1900,
24	2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700,
25	2800, 3000, 3100, 3200, 3300, 3400, 3500, 3600,
26	3700, 3800, 3900, 4000, 4100, 4200, 4300, 4400,
27	4500, 4600, 4700, 4800, 4900, 5000, 5500, 6000,
28	6500, 7000, 7500, 8000, 8500, 9000, 9500, 10000
29};
30
31static struct pmbus_driver_info xdp710_info = {
32	.pages = 1,
33	.format[PSC_VOLTAGE_IN] = direct,
34	.format[PSC_VOLTAGE_OUT] = direct,
35	.format[PSC_CURRENT_OUT] = direct,
36	.format[PSC_POWER] = direct,
37	.format[PSC_TEMPERATURE] = direct,
38	.m[PSC_VOLTAGE_IN] = 4653,
39	.b[PSC_VOLTAGE_IN] = 0,
40	.R[PSC_VOLTAGE_IN] = -2,
41	.m[PSC_VOLTAGE_OUT] = 4653,
42	.b[PSC_VOLTAGE_OUT] = 0,
43	.R[PSC_VOLTAGE_OUT] = -2,
44	.m[PSC_CURRENT_OUT] = 23165,
45	.b[PSC_CURRENT_OUT] = 0,
46	.R[PSC_CURRENT_OUT] = -2,
47	.m[PSC_POWER] = 4211,
48	.b[PSC_POWER] = 0,
49	.R[PSC_POWER] = -2,
50	.m[PSC_TEMPERATURE] = 52,
51	.b[PSC_TEMPERATURE] = 14321,
52	.R[PSC_TEMPERATURE] = -1,
53	.func[0] =
54		PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_PIN |
55		PMBUS_HAVE_TEMP | PMBUS_HAVE_IOUT |
56		PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
57};
58
59static int xdp710_probe(struct i2c_client *client)
60{
61	struct pmbus_driver_info *info;
62	u8 cs_rng;
63	u8 vtlm_rng;
64	int rsense;
65	int ret;
66	int m = 0;
67
68	info = devm_kmemdup(&client->dev, &xdp710_info, sizeof(*info),
69			    GFP_KERNEL);
70	if (!info)
71		return -ENOMEM;
72
73	ret = i2c_smbus_read_word_data(client, XDP710_CS_RNG);
74	if (ret < 0) {
75		dev_err(&client->dev, "Can't get CS_RNG");
76		return ret;
77	}
78	cs_rng = (ret >> 6) & GENMASK(1, 0);
79
80	ret = i2c_smbus_read_word_data(client, XDP710_V_SNS_CFG);
81	if (ret < 0) {
82		dev_err(&client->dev, "Can't get V_SNS_CFG");
83		return ret;
84	}
85	vtlm_rng = ret & GENMASK(1, 0);
86
87	ret = i2c_smbus_read_word_data(client, XDP710_REG_CFG);
88	if (ret < 0) {
89		dev_err(&client->dev, "Can't get REG_CFG");
90		return ret;
91	}
92	ret &= GENMASK(5, 0);
93	rsense = micro_ohm_rsense[ret];
94
95	info->m[PSC_VOLTAGE_IN] <<= vtlm_rng;
96	info->m[PSC_VOLTAGE_OUT] <<= vtlm_rng;
97
98	m = info->m[PSC_CURRENT_OUT];
99	info->m[PSC_CURRENT_OUT] = DIV_ROUND_CLOSEST(m * rsense >> cs_rng, 1000);
100
101	m = info->m[PSC_POWER];
102	info->m[PSC_POWER] = DIV_ROUND_CLOSEST(m * rsense >> cs_rng, 1000);
103
104	return pmbus_do_probe(client, info);
105}
106
107static const struct of_device_id xdp710_of_match[] = {
108	{ .compatible = "infineon,xdp710" },
109	{}
110};
111
112static const struct i2c_device_id xdp710_id[] = {
113	{"xdp710"},
114	{ }
115};
116MODULE_DEVICE_TABLE(i2c, xdp710_id);
117
118static struct i2c_driver xdp710_driver = {
119	.driver = {
120		   .name = "xdp710",
121		   .of_match_table = xdp710_of_match,
122	},
123	.probe = xdp710_probe,
124	.id_table = xdp710_id,
125};
126module_i2c_driver(xdp710_driver);
127
128MODULE_AUTHOR("Peter Yin <peter.yin@quantatw.com>");
129MODULE_DESCRIPTION("PMBus driver for XDP710 HSC");
130MODULE_LICENSE("GPL");
131MODULE_IMPORT_NS(PMBUS);
132