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35fe06d9 PY |
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 | ||
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[] = { | |
d8a66f36 | 113 | {"xdp710"}, |
35fe06d9 PY |
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); |