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1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* | |
3 | * Driver for Delta DPS920AB PSU | |
4 | * | |
5 | * Copyright (C) 2021 Delta Networks, Inc. | |
6 | * Copyright (C) 2021 Sartura Ltd. | |
7 | */ | |
8 | ||
9 | #include <linux/debugfs.h> | |
10 | #include <linux/i2c.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/of_device.h> | |
13 | #include "pmbus.h" | |
14 | ||
15 | struct dps920ab_data { | |
16 | char *mfr_model; | |
17 | char *mfr_id; | |
18 | }; | |
19 | ||
20 | static int dps920ab_read_word_data(struct i2c_client *client, int page, int phase, int reg) | |
21 | { | |
22 | /* | |
23 | * This masks commands which are not supported. | |
24 | * PSU advertises that all features are supported, | |
25 | * in reality that unfortunately is not true. | |
26 | * So enable only those that the datasheet confirms. | |
27 | */ | |
28 | switch (reg) { | |
29 | case PMBUS_FAN_COMMAND_1: | |
30 | case PMBUS_IOUT_OC_WARN_LIMIT: | |
31 | case PMBUS_STATUS_WORD: | |
32 | case PMBUS_READ_VIN: | |
33 | case PMBUS_READ_IIN: | |
34 | case PMBUS_READ_VOUT: | |
35 | case PMBUS_READ_IOUT: | |
36 | case PMBUS_READ_TEMPERATURE_1: | |
37 | case PMBUS_READ_TEMPERATURE_2: | |
38 | case PMBUS_READ_TEMPERATURE_3: | |
39 | case PMBUS_READ_FAN_SPEED_1: | |
40 | case PMBUS_READ_POUT: | |
41 | case PMBUS_READ_PIN: | |
42 | case PMBUS_MFR_VOUT_MIN: | |
43 | case PMBUS_MFR_VOUT_MAX: | |
44 | case PMBUS_MFR_IOUT_MAX: | |
45 | case PMBUS_MFR_POUT_MAX: | |
46 | return pmbus_read_word_data(client, page, phase, reg); | |
47 | default: | |
48 | return -ENXIO; | |
49 | } | |
50 | } | |
51 | ||
52 | static int dps920ab_write_word_data(struct i2c_client *client, int page, int reg, | |
53 | u16 word) | |
54 | { | |
55 | /* | |
56 | * This masks commands which are not supported. | |
57 | * PSU only has one R/W register and that is | |
58 | * for the fan. | |
59 | */ | |
60 | switch (reg) { | |
61 | case PMBUS_FAN_COMMAND_1: | |
62 | return pmbus_write_word_data(client, page, reg, word); | |
63 | default: | |
64 | return -EACCES; | |
65 | } | |
66 | } | |
67 | ||
68 | static struct pmbus_driver_info dps920ab_info = { | |
69 | .pages = 1, | |
70 | ||
71 | .format[PSC_VOLTAGE_IN] = linear, | |
72 | .format[PSC_VOLTAGE_OUT] = linear, | |
73 | .format[PSC_CURRENT_IN] = linear, | |
74 | .format[PSC_CURRENT_OUT] = linear, | |
75 | .format[PSC_POWER] = linear, | |
76 | .format[PSC_FAN] = linear, | |
77 | .format[PSC_TEMPERATURE] = linear, | |
78 | ||
79 | .func[0] = | |
80 | PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | | |
81 | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT | | |
82 | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 | | |
83 | PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12 | | |
84 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT | | |
85 | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, | |
86 | .read_word_data = dps920ab_read_word_data, | |
87 | .write_word_data = dps920ab_write_word_data, | |
88 | }; | |
89 | ||
90 | static int dps920ab_mfr_id_show(struct seq_file *s, void *data) | |
91 | { | |
92 | struct dps920ab_data *priv = s->private; | |
93 | ||
94 | seq_printf(s, "%s\n", priv->mfr_id); | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | DEFINE_SHOW_ATTRIBUTE(dps920ab_mfr_id); | |
100 | ||
101 | static int dps920ab_mfr_model_show(struct seq_file *s, void *data) | |
102 | { | |
103 | struct dps920ab_data *priv = s->private; | |
104 | ||
105 | seq_printf(s, "%s\n", priv->mfr_model); | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | DEFINE_SHOW_ATTRIBUTE(dps920ab_mfr_model); | |
111 | ||
112 | static void dps920ab_init_debugfs(struct dps920ab_data *data, struct i2c_client *client) | |
113 | { | |
114 | struct dentry *debugfs_dir; | |
115 | struct dentry *root; | |
116 | ||
117 | root = pmbus_get_debugfs_dir(client); | |
118 | if (!root) | |
119 | return; | |
120 | ||
121 | debugfs_dir = debugfs_create_dir(client->name, root); | |
3efbcee8 RM |
122 | |
123 | debugfs_create_file("mfr_id", | |
124 | 0400, | |
125 | debugfs_dir, | |
126 | data, | |
127 | &dps920ab_mfr_id_fops); | |
128 | ||
129 | debugfs_create_file("mfr_model", | |
130 | 0400, | |
131 | debugfs_dir, | |
132 | data, | |
133 | &dps920ab_mfr_model_fops); | |
134 | } | |
135 | ||
136 | static int dps920ab_probe(struct i2c_client *client) | |
137 | { | |
138 | u8 buf[I2C_SMBUS_BLOCK_MAX + 1]; | |
139 | struct dps920ab_data *data; | |
140 | int ret; | |
141 | ||
142 | data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); | |
143 | if (!data) | |
144 | return -ENOMEM; | |
145 | ||
146 | ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf); | |
147 | if (ret < 0) { | |
148 | dev_err(&client->dev, "Failed to read Manufacturer ID\n"); | |
149 | return ret; | |
150 | } | |
151 | ||
152 | buf[ret] = '\0'; | |
153 | if (ret != 5 || strncmp(buf, "DELTA", 5)) { | |
154 | buf[ret] = '\0'; | |
155 | dev_err(&client->dev, "Unsupported Manufacturer ID '%s'\n", buf); | |
156 | return -ENODEV; | |
157 | } | |
158 | data->mfr_id = devm_kstrdup(&client->dev, buf, GFP_KERNEL); | |
159 | if (!data->mfr_id) | |
160 | return -ENOMEM; | |
161 | ||
162 | ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); | |
163 | if (ret < 0) { | |
164 | dev_err(&client->dev, "Failed to read Manufacturer Model\n"); | |
165 | return ret; | |
166 | } | |
167 | ||
168 | buf[ret] = '\0'; | |
169 | if (ret != 11 || strncmp(buf, "DPS-920AB", 9)) { | |
170 | dev_err(&client->dev, "Unsupported Manufacturer Model '%s'\n", buf); | |
171 | return -ENODEV; | |
172 | } | |
173 | data->mfr_model = devm_kstrdup(&client->dev, buf, GFP_KERNEL); | |
174 | if (!data->mfr_model) | |
175 | return -ENOMEM; | |
176 | ||
177 | ret = pmbus_do_probe(client, &dps920ab_info); | |
178 | if (ret) | |
179 | return ret; | |
180 | ||
181 | dps920ab_init_debugfs(data, client); | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | static const struct of_device_id __maybe_unused dps920ab_of_match[] = { | |
187 | { .compatible = "delta,dps920ab", }, | |
188 | {} | |
189 | }; | |
190 | ||
191 | MODULE_DEVICE_TABLE(of, dps920ab_of_match); | |
192 | ||
193 | static struct i2c_driver dps920ab_driver = { | |
194 | .driver = { | |
195 | .name = "dps920ab", | |
196 | .of_match_table = of_match_ptr(dps920ab_of_match), | |
197 | }, | |
198 | .probe_new = dps920ab_probe, | |
199 | }; | |
200 | ||
201 | module_i2c_driver(dps920ab_driver); | |
202 | ||
203 | MODULE_AUTHOR("Robert Marko <robert.marko@sartura.hr>"); | |
204 | MODULE_DESCRIPTION("PMBus driver for Delta DPS920AB PSU"); | |
205 | MODULE_LICENSE("GPL"); | |
206 | MODULE_IMPORT_NS(PMBUS); |