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96435693 AW |
1 | /* |
2 | * MEN 14F021P00 Board Management Controller (BMC) hwmon driver. | |
3 | * | |
4 | * This is the core hwmon driver of the MEN 14F021P00 BMC. | |
5 | * The BMC monitors the board voltages which can be access with this | |
6 | * driver through sysfs. | |
7 | * | |
8 | * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU General Public License as published by the | |
12 | * Free Software Foundation; either version 2 of the License, or (at your | |
13 | * option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/hwmon.h> | |
20 | #include <linux/hwmon-sysfs.h> | |
21 | #include <linux/jiffies.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/i2c.h> | |
3d596047 | 24 | #include <linux/err.h> |
96435693 AW |
25 | |
26 | #define DRV_NAME "menf21bmc_hwmon" | |
27 | ||
28 | #define BMC_VOLT_COUNT 5 | |
29 | #define MENF21BMC_V33 0 | |
30 | #define MENF21BMC_V5 1 | |
31 | #define MENF21BMC_V12 2 | |
32 | #define MENF21BMC_V5_SB 3 | |
33 | #define MENF21BMC_VBAT 4 | |
34 | ||
35 | #define IDX_TO_VOLT_MIN_CMD(idx) (0x40 + idx) | |
36 | #define IDX_TO_VOLT_MAX_CMD(idx) (0x50 + idx) | |
37 | #define IDX_TO_VOLT_INP_CMD(idx) (0x60 + idx) | |
38 | ||
39 | struct menf21bmc_hwmon { | |
40 | bool valid; | |
41 | struct i2c_client *i2c_client; | |
42 | unsigned long last_update; | |
43 | int in_val[BMC_VOLT_COUNT]; | |
44 | int in_min[BMC_VOLT_COUNT]; | |
45 | int in_max[BMC_VOLT_COUNT]; | |
46 | }; | |
47 | ||
48 | static const char *const input_names[] = { | |
49 | [MENF21BMC_V33] = "MON_3_3V", | |
50 | [MENF21BMC_V5] = "MON_5V", | |
51 | [MENF21BMC_V12] = "MON_12V", | |
52 | [MENF21BMC_V5_SB] = "5V_STANDBY", | |
53 | [MENF21BMC_VBAT] = "VBAT" | |
54 | }; | |
55 | ||
56 | static struct menf21bmc_hwmon *menf21bmc_hwmon_update(struct device *dev) | |
57 | { | |
58 | int i; | |
59 | int val; | |
60 | struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev); | |
61 | struct menf21bmc_hwmon *data_ret = drv_data; | |
62 | ||
63 | if (time_after(jiffies, drv_data->last_update + HZ) | |
64 | || !drv_data->valid) { | |
65 | for (i = 0; i < BMC_VOLT_COUNT; i++) { | |
66 | val = i2c_smbus_read_word_data(drv_data->i2c_client, | |
67 | IDX_TO_VOLT_INP_CMD(i)); | |
68 | if (val < 0) { | |
69 | data_ret = ERR_PTR(val); | |
70 | goto abort; | |
71 | } | |
72 | drv_data->in_val[i] = val; | |
73 | } | |
74 | drv_data->last_update = jiffies; | |
75 | drv_data->valid = true; | |
76 | } | |
77 | abort: | |
78 | return data_ret; | |
79 | } | |
80 | ||
81 | static int menf21bmc_hwmon_get_volt_limits(struct menf21bmc_hwmon *drv_data) | |
82 | { | |
83 | int i, val; | |
84 | ||
85 | for (i = 0; i < BMC_VOLT_COUNT; i++) { | |
86 | val = i2c_smbus_read_word_data(drv_data->i2c_client, | |
87 | IDX_TO_VOLT_MIN_CMD(i)); | |
88 | if (val < 0) | |
89 | return val; | |
90 | ||
91 | drv_data->in_min[i] = val; | |
92 | ||
93 | val = i2c_smbus_read_word_data(drv_data->i2c_client, | |
94 | IDX_TO_VOLT_MAX_CMD(i)); | |
95 | if (val < 0) | |
96 | return val; | |
97 | ||
98 | drv_data->in_max[i] = val; | |
99 | } | |
100 | return 0; | |
101 | } | |
102 | ||
103 | static ssize_t | |
104 | show_label(struct device *dev, struct device_attribute *devattr, char *buf) | |
105 | { | |
106 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
107 | ||
108 | return sprintf(buf, "%s\n", input_names[attr->index]); | |
109 | } | |
110 | ||
111 | static ssize_t | |
112 | show_in(struct device *dev, struct device_attribute *devattr, char *buf) | |
113 | { | |
114 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
115 | struct menf21bmc_hwmon *drv_data = menf21bmc_hwmon_update(dev); | |
116 | ||
117 | if (IS_ERR(drv_data)) | |
118 | return PTR_ERR(drv_data); | |
119 | ||
120 | return sprintf(buf, "%d\n", drv_data->in_val[attr->index]); | |
121 | } | |
122 | ||
123 | static ssize_t | |
124 | show_min(struct device *dev, struct device_attribute *devattr, char *buf) | |
125 | { | |
126 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
127 | struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev); | |
128 | ||
129 | return sprintf(buf, "%d\n", drv_data->in_min[attr->index]); | |
130 | } | |
131 | ||
132 | static ssize_t | |
133 | show_max(struct device *dev, struct device_attribute *devattr, char *buf) | |
134 | { | |
135 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
136 | struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev); | |
137 | ||
138 | return sprintf(buf, "%d\n", drv_data->in_max[attr->index]); | |
139 | } | |
140 | ||
141 | #define create_voltage_sysfs(idx) \ | |
142 | static SENSOR_DEVICE_ATTR(in##idx##_input, S_IRUGO, \ | |
143 | show_in, NULL, idx); \ | |
144 | static SENSOR_DEVICE_ATTR(in##idx##_min, S_IRUGO, \ | |
145 | show_min, NULL, idx); \ | |
146 | static SENSOR_DEVICE_ATTR(in##idx##_max, S_IRUGO, \ | |
147 | show_max, NULL, idx); \ | |
148 | static SENSOR_DEVICE_ATTR(in##idx##_label, S_IRUGO, \ | |
149 | show_label, NULL, idx); | |
150 | ||
151 | create_voltage_sysfs(0); | |
152 | create_voltage_sysfs(1); | |
153 | create_voltage_sysfs(2); | |
154 | create_voltage_sysfs(3); | |
155 | create_voltage_sysfs(4); | |
156 | ||
157 | static struct attribute *menf21bmc_hwmon_attrs[] = { | |
158 | &sensor_dev_attr_in0_input.dev_attr.attr, | |
159 | &sensor_dev_attr_in0_min.dev_attr.attr, | |
160 | &sensor_dev_attr_in0_max.dev_attr.attr, | |
161 | &sensor_dev_attr_in0_label.dev_attr.attr, | |
162 | ||
163 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
164 | &sensor_dev_attr_in1_min.dev_attr.attr, | |
165 | &sensor_dev_attr_in1_max.dev_attr.attr, | |
166 | &sensor_dev_attr_in1_label.dev_attr.attr, | |
167 | ||
168 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
169 | &sensor_dev_attr_in2_min.dev_attr.attr, | |
170 | &sensor_dev_attr_in2_max.dev_attr.attr, | |
171 | &sensor_dev_attr_in2_label.dev_attr.attr, | |
172 | ||
173 | &sensor_dev_attr_in3_input.dev_attr.attr, | |
174 | &sensor_dev_attr_in3_min.dev_attr.attr, | |
175 | &sensor_dev_attr_in3_max.dev_attr.attr, | |
176 | &sensor_dev_attr_in3_label.dev_attr.attr, | |
177 | ||
178 | &sensor_dev_attr_in4_input.dev_attr.attr, | |
179 | &sensor_dev_attr_in4_min.dev_attr.attr, | |
180 | &sensor_dev_attr_in4_max.dev_attr.attr, | |
181 | &sensor_dev_attr_in4_label.dev_attr.attr, | |
182 | NULL | |
183 | }; | |
184 | ||
185 | ATTRIBUTE_GROUPS(menf21bmc_hwmon); | |
186 | ||
187 | static int menf21bmc_hwmon_probe(struct platform_device *pdev) | |
188 | { | |
189 | int ret; | |
190 | struct menf21bmc_hwmon *drv_data; | |
191 | struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent); | |
192 | struct device *hwmon_dev; | |
193 | ||
194 | drv_data = devm_kzalloc(&pdev->dev, sizeof(struct menf21bmc_hwmon), | |
195 | GFP_KERNEL); | |
196 | if (!drv_data) | |
197 | return -ENOMEM; | |
198 | ||
199 | drv_data->i2c_client = i2c_client; | |
200 | ||
201 | ret = menf21bmc_hwmon_get_volt_limits(drv_data); | |
202 | if (ret) { | |
203 | dev_err(&pdev->dev, "failed to read sensor limits"); | |
204 | return ret; | |
205 | } | |
206 | ||
207 | hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, | |
208 | "menf21bmc", drv_data, | |
209 | menf21bmc_hwmon_groups); | |
210 | if (IS_ERR(hwmon_dev)) | |
211 | return PTR_ERR(hwmon_dev); | |
212 | ||
213 | dev_info(&pdev->dev, "MEN 14F021P00 BMC hwmon device enabled"); | |
214 | ||
215 | return 0; | |
216 | } | |
217 | ||
218 | static struct platform_driver menf21bmc_hwmon = { | |
219 | .probe = menf21bmc_hwmon_probe, | |
220 | .driver = { | |
221 | .name = DRV_NAME, | |
96435693 AW |
222 | }, |
223 | }; | |
224 | ||
225 | module_platform_driver(menf21bmc_hwmon); | |
226 | ||
227 | MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>"); | |
228 | MODULE_DESCRIPTION("MEN 14F021P00 BMC hwmon"); | |
229 | MODULE_LICENSE("GPL v2"); | |
230 | MODULE_ALIAS("platform:menf21bmc_hwmon"); |