1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 /* Copyright (C) 2017 Netronome Systems, Inc. */
3 
4 #include <linux/kernel.h>
5 #include <linux/bitops.h>
6 #include <linux/hwmon.h>
7 
8 #include "nfpcore/nfp_cpp.h"
9 #include "nfpcore/nfp_nsp.h"
10 #include "nfp_main.h"
11 
12 #define NFP_TEMP_MAX		(95 * 1000)
13 #define NFP_TEMP_CRIT		(105 * 1000)
14 
15 #define NFP_POWER_MAX		(25 * 1000 * 1000)
16 
17 static int nfp_hwmon_sensor_id(enum hwmon_sensor_types type, int channel)
18 {
19 	if (type == hwmon_temp)
20 		return NFP_SENSOR_CHIP_TEMPERATURE;
21 	if (type == hwmon_power)
22 		return NFP_SENSOR_ASSEMBLY_POWER + channel;
23 	return -EINVAL;
24 }
25 
26 static int
27 nfp_hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
28 	       int channel, long *val)
29 {
30 	static const struct {
31 		enum hwmon_sensor_types type;
32 		u32 attr;
33 		long val;
34 	} const_vals[] = {
35 		{ hwmon_temp,	hwmon_temp_max,		NFP_TEMP_MAX },
36 		{ hwmon_temp,	hwmon_temp_crit,	NFP_TEMP_CRIT },
37 		{ hwmon_power,	hwmon_power_max,	NFP_POWER_MAX },
38 	};
39 	struct nfp_pf *pf = dev_get_drvdata(dev);
40 	enum nfp_nsp_sensor_id id;
41 	int err, i;
42 
43 	for (i = 0; i < ARRAY_SIZE(const_vals); i++)
44 		if (const_vals[i].type == type && const_vals[i].attr == attr) {
45 			*val = const_vals[i].val;
46 			return 0;
47 		}
48 
49 	err = nfp_hwmon_sensor_id(type, channel);
50 	if (err < 0)
51 		return err;
52 	id = err;
53 
54 	if (!(pf->nspi->sensor_mask & BIT(id)))
55 		return -EOPNOTSUPP;
56 
57 	if (type == hwmon_temp && attr == hwmon_temp_input)
58 		return nfp_hwmon_read_sensor(pf->cpp, id, val);
59 	if (type == hwmon_power && attr == hwmon_power_input)
60 		return nfp_hwmon_read_sensor(pf->cpp, id, val);
61 
62 	return -EINVAL;
63 }
64 
65 static umode_t
66 nfp_hwmon_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr,
67 		     int channel)
68 {
69 	if (type == hwmon_temp) {
70 		switch (attr) {
71 		case hwmon_temp_input:
72 		case hwmon_temp_crit:
73 		case hwmon_temp_max:
74 			return 0444;
75 		}
76 	} else if (type == hwmon_power) {
77 		switch (attr) {
78 		case hwmon_power_input:
79 		case hwmon_power_max:
80 			return 0444;
81 		}
82 	}
83 	return 0;
84 }
85 
86 static u32 nfp_chip_config[] = {
87 	HWMON_C_REGISTER_TZ,
88 	0
89 };
90 
91 static const struct hwmon_channel_info nfp_chip = {
92 	.type = hwmon_chip,
93 	.config = nfp_chip_config,
94 };
95 
96 static u32 nfp_temp_config[] = {
97 	HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT,
98 	0
99 };
100 
101 static const struct hwmon_channel_info nfp_temp = {
102 	.type = hwmon_temp,
103 	.config = nfp_temp_config,
104 };
105 
106 static u32 nfp_power_config[] = {
107 	HWMON_P_INPUT | HWMON_P_MAX,
108 	HWMON_P_INPUT,
109 	HWMON_P_INPUT,
110 	0
111 };
112 
113 static const struct hwmon_channel_info nfp_power = {
114 	.type = hwmon_power,
115 	.config = nfp_power_config,
116 };
117 
118 static const struct hwmon_channel_info * const nfp_hwmon_info[] = {
119 	&nfp_chip,
120 	&nfp_temp,
121 	&nfp_power,
122 	NULL
123 };
124 
125 static const struct hwmon_ops nfp_hwmon_ops = {
126 	.is_visible = nfp_hwmon_is_visible,
127 	.read = nfp_hwmon_read,
128 };
129 
130 static const struct hwmon_chip_info nfp_chip_info = {
131 	.ops = &nfp_hwmon_ops,
132 	.info = nfp_hwmon_info,
133 };
134 
135 int nfp_hwmon_register(struct nfp_pf *pf)
136 {
137 	if (!IS_REACHABLE(CONFIG_HWMON))
138 		return 0;
139 
140 	if (!pf->nspi) {
141 		nfp_warn(pf->cpp, "not registering HWMON (no NSP info)\n");
142 		return 0;
143 	}
144 	if (!pf->nspi->sensor_mask) {
145 		nfp_info(pf->cpp,
146 			 "not registering HWMON (NSP doesn't report sensors)\n");
147 		return 0;
148 	}
149 
150 	pf->hwmon_dev = hwmon_device_register_with_info(&pf->pdev->dev, "nfp",
151 							pf, &nfp_chip_info,
152 							NULL);
153 	return PTR_ERR_OR_ZERO(pf->hwmon_dev);
154 }
155 
156 void nfp_hwmon_unregister(struct nfp_pf *pf)
157 {
158 	if (!IS_REACHABLE(CONFIG_HWMON) || !pf->hwmon_dev)
159 		return;
160 
161 	hwmon_device_unregister(pf->hwmon_dev);
162 }
163