1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * An hwmon driver for the Analog Devices AD7416/17/18 |
4 | * Copyright (C) 2006-07 Tower Technologies |
5 | * |
6 | * Author: Alessandro Zummo <a.zummo@towertech.it> |
7 | * |
8 | * Based on lm75.c |
9 | * Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl> |
10 | */ |
11 | |
12 | #include <linux/module.h> |
13 | #include <linux/jiffies.h> |
14 | #include <linux/i2c.h> |
15 | #include <linux/hwmon.h> |
16 | #include <linux/hwmon-sysfs.h> |
17 | #include <linux/err.h> |
18 | #include <linux/mutex.h> |
19 | #include <linux/of.h> |
20 | #include <linux/delay.h> |
21 | #include <linux/slab.h> |
22 | |
23 | #include "lm75.h" |
24 | |
25 | #define DRV_VERSION "0.4" |
26 | |
27 | enum chips { ad7416, ad7417, ad7418 }; |
28 | |
29 | /* AD7418 registers */ |
30 | #define AD7418_REG_TEMP_IN 0x00 |
31 | #define AD7418_REG_CONF 0x01 |
32 | #define AD7418_REG_TEMP_HYST 0x02 |
33 | #define AD7418_REG_TEMP_OS 0x03 |
34 | #define AD7418_REG_ADC 0x04 |
35 | #define AD7418_REG_CONF2 0x05 |
36 | |
37 | #define AD7418_REG_ADC_CH(x) ((x) << 5) |
38 | #define AD7418_CH_TEMP AD7418_REG_ADC_CH(0) |
39 | |
40 | static const u8 AD7418_REG_TEMP[] = { AD7418_REG_TEMP_IN, |
41 | AD7418_REG_TEMP_HYST, |
42 | AD7418_REG_TEMP_OS }; |
43 | |
44 | struct ad7418_data { |
45 | struct i2c_client *client; |
46 | enum chips type; |
47 | struct mutex lock; |
48 | int adc_max; /* number of ADC channels */ |
49 | bool valid; |
50 | unsigned long last_updated; /* In jiffies */ |
51 | s16 temp[3]; /* Register values */ |
52 | u16 in[4]; |
53 | }; |
54 | |
55 | static int ad7418_update_device(struct device *dev) |
56 | { |
57 | struct ad7418_data *data = dev_get_drvdata(dev); |
58 | struct i2c_client *client = data->client; |
59 | s32 val; |
60 | |
61 | mutex_lock(&data->lock); |
62 | |
63 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) |
64 | || !data->valid) { |
65 | u8 cfg; |
66 | int i, ch; |
67 | |
68 | /* read config register and clear channel bits */ |
69 | val = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); |
70 | if (val < 0) |
71 | goto abort; |
72 | |
73 | cfg = val; |
74 | cfg &= 0x1F; |
75 | |
76 | val = i2c_smbus_write_byte_data(client, AD7418_REG_CONF, |
77 | value: cfg | AD7418_CH_TEMP); |
78 | if (val < 0) |
79 | goto abort; |
80 | |
81 | udelay(30); |
82 | |
83 | for (i = 0; i < 3; i++) { |
84 | val = i2c_smbus_read_word_swapped(client, |
85 | command: AD7418_REG_TEMP[i]); |
86 | if (val < 0) |
87 | goto abort; |
88 | |
89 | data->temp[i] = val; |
90 | } |
91 | |
92 | for (i = 0, ch = 4; i < data->adc_max; i++, ch--) { |
93 | val = i2c_smbus_write_byte_data(client, AD7418_REG_CONF, |
94 | value: cfg | AD7418_REG_ADC_CH(ch)); |
95 | if (val < 0) |
96 | goto abort; |
97 | |
98 | udelay(15); |
99 | val = i2c_smbus_read_word_swapped(client, |
100 | AD7418_REG_ADC); |
101 | if (val < 0) |
102 | goto abort; |
103 | |
104 | data->in[data->adc_max - 1 - i] = val; |
105 | } |
106 | |
107 | /* restore old configuration value */ |
108 | val = i2c_smbus_write_word_swapped(client, AD7418_REG_CONF, |
109 | value: cfg); |
110 | if (val < 0) |
111 | goto abort; |
112 | |
113 | data->last_updated = jiffies; |
114 | data->valid = true; |
115 | } |
116 | |
117 | mutex_unlock(lock: &data->lock); |
118 | return 0; |
119 | |
120 | abort: |
121 | data->valid = false; |
122 | mutex_unlock(lock: &data->lock); |
123 | return val; |
124 | } |
125 | |
126 | static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, |
127 | char *buf) |
128 | { |
129 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
130 | struct ad7418_data *data = dev_get_drvdata(dev); |
131 | int ret; |
132 | |
133 | ret = ad7418_update_device(dev); |
134 | if (ret < 0) |
135 | return ret; |
136 | |
137 | return sprintf(buf, fmt: "%d\n" , |
138 | LM75_TEMP_FROM_REG(reg: data->temp[attr->index])); |
139 | } |
140 | |
141 | static ssize_t adc_show(struct device *dev, struct device_attribute *devattr, |
142 | char *buf) |
143 | { |
144 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
145 | struct ad7418_data *data = dev_get_drvdata(dev); |
146 | int ret; |
147 | |
148 | ret = ad7418_update_device(dev); |
149 | if (ret < 0) |
150 | return ret; |
151 | |
152 | return sprintf(buf, fmt: "%d\n" , |
153 | ((data->in[attr->index] >> 6) * 2500 + 512) / 1024); |
154 | } |
155 | |
156 | static ssize_t temp_store(struct device *dev, |
157 | struct device_attribute *devattr, const char *buf, |
158 | size_t count) |
159 | { |
160 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
161 | struct ad7418_data *data = dev_get_drvdata(dev); |
162 | struct i2c_client *client = data->client; |
163 | long temp; |
164 | int ret = kstrtol(s: buf, base: 10, res: &temp); |
165 | |
166 | if (ret < 0) |
167 | return ret; |
168 | |
169 | mutex_lock(&data->lock); |
170 | data->temp[attr->index] = LM75_TEMP_TO_REG(temp); |
171 | i2c_smbus_write_word_swapped(client, |
172 | command: AD7418_REG_TEMP[attr->index], |
173 | value: data->temp[attr->index]); |
174 | mutex_unlock(lock: &data->lock); |
175 | return count; |
176 | } |
177 | |
178 | static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0); |
179 | static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, temp, 1); |
180 | static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 2); |
181 | |
182 | static SENSOR_DEVICE_ATTR_RO(in1_input, adc, 0); |
183 | static SENSOR_DEVICE_ATTR_RO(in2_input, adc, 1); |
184 | static SENSOR_DEVICE_ATTR_RO(in3_input, adc, 2); |
185 | static SENSOR_DEVICE_ATTR_RO(in4_input, adc, 3); |
186 | |
187 | static struct attribute *ad7416_attrs[] = { |
188 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
189 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, |
190 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
191 | NULL |
192 | }; |
193 | ATTRIBUTE_GROUPS(ad7416); |
194 | |
195 | static struct attribute *ad7417_attrs[] = { |
196 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
197 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, |
198 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
199 | &sensor_dev_attr_in1_input.dev_attr.attr, |
200 | &sensor_dev_attr_in2_input.dev_attr.attr, |
201 | &sensor_dev_attr_in3_input.dev_attr.attr, |
202 | &sensor_dev_attr_in4_input.dev_attr.attr, |
203 | NULL |
204 | }; |
205 | ATTRIBUTE_GROUPS(ad7417); |
206 | |
207 | static struct attribute *ad7418_attrs[] = { |
208 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
209 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, |
210 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
211 | &sensor_dev_attr_in1_input.dev_attr.attr, |
212 | NULL |
213 | }; |
214 | ATTRIBUTE_GROUPS(ad7418); |
215 | |
216 | static void ad7418_init_client(struct i2c_client *client) |
217 | { |
218 | struct ad7418_data *data = i2c_get_clientdata(client); |
219 | |
220 | int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); |
221 | if (reg < 0) { |
222 | dev_err(&client->dev, "cannot read configuration register\n" ); |
223 | } else { |
224 | dev_info(&client->dev, "configuring for mode 1\n" ); |
225 | i2c_smbus_write_byte_data(client, AD7418_REG_CONF, value: reg & 0xfe); |
226 | |
227 | if (data->type == ad7417 || data->type == ad7418) |
228 | i2c_smbus_write_byte_data(client, |
229 | AD7418_REG_CONF2, value: 0x00); |
230 | } |
231 | } |
232 | |
233 | static const struct i2c_device_id ad7418_id[]; |
234 | |
235 | static int ad7418_probe(struct i2c_client *client) |
236 | { |
237 | struct device *dev = &client->dev; |
238 | struct i2c_adapter *adapter = client->adapter; |
239 | struct ad7418_data *data; |
240 | struct device *hwmon_dev; |
241 | const struct attribute_group **attr_groups = NULL; |
242 | |
243 | if (!i2c_check_functionality(adap: adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
244 | I2C_FUNC_SMBUS_WORD_DATA)) |
245 | return -EOPNOTSUPP; |
246 | |
247 | data = devm_kzalloc(dev, size: sizeof(struct ad7418_data), GFP_KERNEL); |
248 | if (!data) |
249 | return -ENOMEM; |
250 | |
251 | i2c_set_clientdata(client, data); |
252 | |
253 | mutex_init(&data->lock); |
254 | data->client = client; |
255 | if (dev->of_node) |
256 | data->type = (uintptr_t)of_device_get_match_data(dev); |
257 | else |
258 | data->type = i2c_match_id(id: ad7418_id, client)->driver_data; |
259 | |
260 | switch (data->type) { |
261 | case ad7416: |
262 | data->adc_max = 0; |
263 | attr_groups = ad7416_groups; |
264 | break; |
265 | |
266 | case ad7417: |
267 | data->adc_max = 4; |
268 | attr_groups = ad7417_groups; |
269 | break; |
270 | |
271 | case ad7418: |
272 | data->adc_max = 1; |
273 | attr_groups = ad7418_groups; |
274 | break; |
275 | } |
276 | |
277 | dev_info(dev, "%s chip found\n" , client->name); |
278 | |
279 | /* Initialize the AD7418 chip */ |
280 | ad7418_init_client(client); |
281 | |
282 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, |
283 | name: client->name, |
284 | drvdata: data, groups: attr_groups); |
285 | return PTR_ERR_OR_ZERO(ptr: hwmon_dev); |
286 | } |
287 | |
288 | static const struct i2c_device_id ad7418_id[] = { |
289 | { "ad7416" , ad7416 }, |
290 | { "ad7417" , ad7417 }, |
291 | { "ad7418" , ad7418 }, |
292 | { } |
293 | }; |
294 | MODULE_DEVICE_TABLE(i2c, ad7418_id); |
295 | |
296 | static const struct of_device_id ad7418_dt_ids[] = { |
297 | { .compatible = "adi,ad7416" , .data = (void *)ad7416, }, |
298 | { .compatible = "adi,ad7417" , .data = (void *)ad7417, }, |
299 | { .compatible = "adi,ad7418" , .data = (void *)ad7418, }, |
300 | { } |
301 | }; |
302 | MODULE_DEVICE_TABLE(of, ad7418_dt_ids); |
303 | |
304 | static struct i2c_driver ad7418_driver = { |
305 | .driver = { |
306 | .name = "ad7418" , |
307 | .of_match_table = ad7418_dt_ids, |
308 | }, |
309 | .probe = ad7418_probe, |
310 | .id_table = ad7418_id, |
311 | }; |
312 | |
313 | module_i2c_driver(ad7418_driver); |
314 | |
315 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>" ); |
316 | MODULE_DESCRIPTION("AD7416/17/18 driver" ); |
317 | MODULE_LICENSE("GPL" ); |
318 | MODULE_VERSION(DRV_VERSION); |
319 | |