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.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(m: s, fmt: "%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(m: s, fmt: "%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(name: client->name, parent: root); |
122 | |
123 | debugfs_create_file(name: "mfr_id" , |
124 | mode: 0400, |
125 | parent: debugfs_dir, |
126 | data, |
127 | fops: &dps920ab_mfr_id_fops); |
128 | |
129 | debugfs_create_file(name: "mfr_model" , |
130 | mode: 0400, |
131 | parent: debugfs_dir, |
132 | data, |
133 | fops: &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(dev: &client->dev, size: sizeof(*data), GFP_KERNEL); |
143 | if (!data) |
144 | return -ENOMEM; |
145 | |
146 | ret = i2c_smbus_read_block_data(client, command: PMBUS_MFR_ID, values: 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(dev: &client->dev, s: buf, GFP_KERNEL); |
159 | if (!data->mfr_id) |
160 | return -ENOMEM; |
161 | |
162 | ret = i2c_smbus_read_block_data(client, command: PMBUS_MFR_MODEL, values: 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(dev: &client->dev, s: buf, GFP_KERNEL); |
174 | if (!data->mfr_model) |
175 | return -ENOMEM; |
176 | |
177 | ret = pmbus_do_probe(client, info: &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 = 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); |
207 | |