xref: /openbmc/linux/drivers/hwmon/pmbus/bel-pfe.c (revision 0d3b051a)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Hardware monitoring driver for BEL PFE family power supplies.
4  *
5  * Copyright (c) 2019 Facebook Inc.
6  */
7 
8 #include <linux/err.h>
9 #include <linux/i2c.h>
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/pmbus.h>
14 
15 #include "pmbus.h"
16 
17 enum chips {pfe1100, pfe3000};
18 
19 /*
20  * Disable status check for pfe3000 devices, because some devices report
21  * communication error (invalid command) for VOUT_MODE command (0x20)
22  * although correct VOUT_MODE (0x16) is returned: it leads to incorrect
23  * exponent in linear mode.
24  */
25 static struct pmbus_platform_data pfe3000_plat_data = {
26 	.flags = PMBUS_SKIP_STATUS_CHECK,
27 };
28 
29 static struct pmbus_driver_info pfe_driver_info[] = {
30 	[pfe1100] = {
31 		.pages = 1,
32 		.format[PSC_VOLTAGE_IN] = linear,
33 		.format[PSC_VOLTAGE_OUT] = linear,
34 		.format[PSC_CURRENT_IN] = linear,
35 		.format[PSC_CURRENT_OUT] = linear,
36 		.format[PSC_POWER] = linear,
37 		.format[PSC_TEMPERATURE] = linear,
38 		.format[PSC_FAN] = linear,
39 
40 		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
41 			   PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
42 			   PMBUS_HAVE_POUT |
43 			   PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
44 			   PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
45 			   PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
46 			   PMBUS_HAVE_STATUS_TEMP |
47 			   PMBUS_HAVE_FAN12,
48 	},
49 
50 	[pfe3000] = {
51 		.pages = 7,
52 		.format[PSC_VOLTAGE_IN] = linear,
53 		.format[PSC_VOLTAGE_OUT] = linear,
54 		.format[PSC_CURRENT_IN] = linear,
55 		.format[PSC_CURRENT_OUT] = linear,
56 		.format[PSC_POWER] = linear,
57 		.format[PSC_TEMPERATURE] = linear,
58 		.format[PSC_FAN] = linear,
59 
60 		/* Page 0: V1. */
61 		.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
62 			   PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
63 			   PMBUS_HAVE_POUT | PMBUS_HAVE_FAN12 |
64 			   PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
65 			   PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
66 			   PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
67 			   PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP |
68 			   PMBUS_HAVE_VCAP,
69 
70 		/* Page 1: Vsb. */
71 		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
72 			   PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
73 			   PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
74 			   PMBUS_HAVE_POUT,
75 
76 		/*
77 		 * Page 2: V1 Ishare.
78 		 * Page 3: Reserved.
79 		 * Page 4: V1 Cathode.
80 		 * Page 5: Vsb Cathode.
81 		 * Page 6: V1 Sense.
82 		 */
83 		.func[2] = PMBUS_HAVE_VOUT,
84 		.func[4] = PMBUS_HAVE_VOUT,
85 		.func[5] = PMBUS_HAVE_VOUT,
86 		.func[6] = PMBUS_HAVE_VOUT,
87 	},
88 };
89 
90 static const struct i2c_device_id pfe_device_id[];
91 
92 static int pfe_pmbus_probe(struct i2c_client *client)
93 {
94 	int model;
95 
96 	model = (int)i2c_match_id(pfe_device_id, client)->driver_data;
97 
98 	/*
99 	 * PFE3000-12-069RA devices may not stay in page 0 during device
100 	 * probe which leads to probe failure (read status word failed).
101 	 * So let's set the device to page 0 at the beginning.
102 	 */
103 	if (model == pfe3000) {
104 		client->dev.platform_data = &pfe3000_plat_data;
105 		i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
106 	}
107 
108 	return pmbus_do_probe(client, &pfe_driver_info[model]);
109 }
110 
111 static const struct i2c_device_id pfe_device_id[] = {
112 	{"pfe1100", pfe1100},
113 	{"pfe3000", pfe3000},
114 	{}
115 };
116 
117 MODULE_DEVICE_TABLE(i2c, pfe_device_id);
118 
119 static struct i2c_driver pfe_pmbus_driver = {
120 	.driver = {
121 		   .name = "bel-pfe",
122 	},
123 	.probe_new = pfe_pmbus_probe,
124 	.id_table = pfe_device_id,
125 };
126 
127 module_i2c_driver(pfe_pmbus_driver);
128 
129 MODULE_AUTHOR("Tao Ren <rentao.bupt@gmail.com>");
130 MODULE_DESCRIPTION("PMBus driver for BEL PFE Family Power Supplies");
131 MODULE_LICENSE("GPL");
132