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 */
20 static 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
31 static 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
xdp710_probe(struct i2c_client * client)59 static 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
107 static const struct of_device_id xdp710_of_match[] = {
108 { .compatible = "infineon,xdp710" },
109 {}
110 };
111
112 static const struct i2c_device_id xdp710_id[] = {
113 {"xdp710", 0},
114 { }
115 };
116 MODULE_DEVICE_TABLE(i2c, xdp710_id);
117
118 static 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 };
126 module_i2c_driver(xdp710_driver);
127
128 MODULE_AUTHOR("Peter Yin <peter.yin@quantatw.com>");
129 MODULE_DESCRIPTION("PMBus driver for XDP710 HSC");
130 MODULE_LICENSE("GPL");
131 MODULE_IMPORT_NS(PMBUS);
132