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a10e763b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
2d8dd65f AZ |
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> | |
2d8dd65f AZ |
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> | |
f4c2965e | 19 | #include <linux/of_device.h> |
2d8dd65f | 20 | #include <linux/delay.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
2d8dd65f AZ |
22 | |
23 | #include "lm75.h" | |
24 | ||
369932f6 | 25 | #define DRV_VERSION "0.4" |
2d8dd65f | 26 | |
369932f6 | 27 | enum chips { ad7416, ad7417, ad7418 }; |
2d8dd65f AZ |
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 { | |
337076f9 | 45 | struct i2c_client *client; |
2d8dd65f AZ |
46 | enum chips type; |
47 | struct mutex lock; | |
48 | int adc_max; /* number of ADC channels */ | |
49 | char valid; | |
50 | unsigned long last_updated; /* In jiffies */ | |
51 | s16 temp[3]; /* Register values */ | |
52 | u16 in[4]; | |
53 | }; | |
54 | ||
45034e48 | 55 | static int ad7418_update_device(struct device *dev) |
2d8dd65f | 56 | { |
337076f9 AL |
57 | struct ad7418_data *data = dev_get_drvdata(dev); |
58 | struct i2c_client *client = data->client; | |
45034e48 | 59 | s32 val; |
2d8dd65f AZ |
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 */ | |
45034e48 BM |
69 | val = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); |
70 | if (val < 0) | |
71 | goto abort; | |
72 | ||
73 | cfg = val; | |
2d8dd65f AZ |
74 | cfg &= 0x1F; |
75 | ||
45034e48 | 76 | val = i2c_smbus_write_byte_data(client, AD7418_REG_CONF, |
2d8dd65f | 77 | cfg | AD7418_CH_TEMP); |
45034e48 BM |
78 | if (val < 0) |
79 | goto abort; | |
80 | ||
2d8dd65f AZ |
81 | udelay(30); |
82 | ||
83 | for (i = 0; i < 3; i++) { | |
45034e48 BM |
84 | val = i2c_smbus_read_word_swapped(client, |
85 | AD7418_REG_TEMP[i]); | |
86 | if (val < 0) | |
87 | goto abort; | |
88 | ||
89 | data->temp[i] = val; | |
2d8dd65f AZ |
90 | } |
91 | ||
92 | for (i = 0, ch = 4; i < data->adc_max; i++, ch--) { | |
45034e48 | 93 | val = i2c_smbus_write_byte_data(client, AD7418_REG_CONF, |
2d8dd65f | 94 | cfg | AD7418_REG_ADC_CH(ch)); |
45034e48 BM |
95 | if (val < 0) |
96 | goto abort; | |
2d8dd65f AZ |
97 | |
98 | udelay(15); | |
45034e48 BM |
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; | |
2d8dd65f AZ |
105 | } |
106 | ||
107 | /* restore old configuration value */ | |
45034e48 BM |
108 | val = i2c_smbus_write_word_swapped(client, AD7418_REG_CONF, |
109 | cfg); | |
110 | if (val < 0) | |
111 | goto abort; | |
2d8dd65f AZ |
112 | |
113 | data->last_updated = jiffies; | |
114 | data->valid = 1; | |
115 | } | |
116 | ||
117 | mutex_unlock(&data->lock); | |
45034e48 | 118 | return 0; |
2d8dd65f | 119 | |
45034e48 BM |
120 | abort: |
121 | data->valid = 0; | |
122 | mutex_unlock(&data->lock); | |
123 | return val; | |
2d8dd65f AZ |
124 | } |
125 | ||
6fdc5d7f GR |
126 | static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, |
127 | char *buf) | |
2d8dd65f AZ |
128 | { |
129 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
45034e48 BM |
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 | ||
2d8dd65f AZ |
137 | return sprintf(buf, "%d\n", |
138 | LM75_TEMP_FROM_REG(data->temp[attr->index])); | |
139 | } | |
140 | ||
6fdc5d7f | 141 | static ssize_t adc_show(struct device *dev, struct device_attribute *devattr, |
2d8dd65f AZ |
142 | char *buf) |
143 | { | |
144 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
45034e48 BM |
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; | |
2d8dd65f AZ |
151 | |
152 | return sprintf(buf, "%d\n", | |
153 | ((data->in[attr->index] >> 6) * 2500 + 512) / 1024); | |
154 | } | |
155 | ||
6fdc5d7f GR |
156 | static ssize_t temp_store(struct device *dev, |
157 | struct device_attribute *devattr, const char *buf, | |
158 | size_t count) | |
2d8dd65f AZ |
159 | { |
160 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
337076f9 AL |
161 | struct ad7418_data *data = dev_get_drvdata(dev); |
162 | struct i2c_client *client = data->client; | |
e91aef22 FM |
163 | long temp; |
164 | int ret = kstrtol(buf, 10, &temp); | |
165 | ||
166 | if (ret < 0) | |
167 | return ret; | |
2d8dd65f AZ |
168 | |
169 | mutex_lock(&data->lock); | |
170 | data->temp[attr->index] = LM75_TEMP_TO_REG(temp); | |
90f4102c JD |
171 | i2c_smbus_write_word_swapped(client, |
172 | AD7418_REG_TEMP[attr->index], | |
173 | data->temp[attr->index]); | |
2d8dd65f AZ |
174 | mutex_unlock(&data->lock); |
175 | return count; | |
176 | } | |
177 | ||
6fdc5d7f GR |
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); | |
2d8dd65f | 181 | |
6fdc5d7f GR |
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); | |
2d8dd65f | 186 | |
337076f9 | 187 | static struct attribute *ad7416_attrs[] = { |
2d8dd65f AZ |
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 | }; | |
337076f9 | 193 | ATTRIBUTE_GROUPS(ad7416); |
2d8dd65f | 194 | |
337076f9 | 195 | static struct attribute *ad7417_attrs[] = { |
2d8dd65f AZ |
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 | }; | |
337076f9 | 205 | ATTRIBUTE_GROUPS(ad7417); |
2d8dd65f | 206 | |
337076f9 | 207 | static struct attribute *ad7418_attrs[] = { |
2d8dd65f AZ |
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 | }; | |
337076f9 | 214 | ATTRIBUTE_GROUPS(ad7418); |
2d8dd65f | 215 | |
991763a9 AL |
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, reg & 0xfe); | |
226 | ||
227 | if (data->type == ad7417 || data->type == ad7418) | |
228 | i2c_smbus_write_byte_data(client, | |
229 | AD7418_REG_CONF2, 0x00); | |
230 | } | |
231 | } | |
232 | ||
369932f6 JD |
233 | static int ad7418_probe(struct i2c_client *client, |
234 | const struct i2c_device_id *id) | |
2d8dd65f | 235 | { |
337076f9 | 236 | struct device *dev = &client->dev; |
369932f6 | 237 | struct i2c_adapter *adapter = client->adapter; |
2d8dd65f | 238 | struct ad7418_data *data; |
337076f9 AL |
239 | struct device *hwmon_dev; |
240 | const struct attribute_group **attr_groups = NULL; | |
2d8dd65f AZ |
241 | |
242 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | | |
d5282926 GR |
243 | I2C_FUNC_SMBUS_WORD_DATA)) |
244 | return -EOPNOTSUPP; | |
2d8dd65f | 245 | |
337076f9 | 246 | data = devm_kzalloc(dev, sizeof(struct ad7418_data), GFP_KERNEL); |
d5282926 GR |
247 | if (!data) |
248 | return -ENOMEM; | |
2d8dd65f | 249 | |
2d8dd65f AZ |
250 | i2c_set_clientdata(client, data); |
251 | ||
252 | mutex_init(&data->lock); | |
337076f9 | 253 | data->client = client; |
f4c2965e LW |
254 | if (dev->of_node) |
255 | data->type = (enum chips)of_device_get_match_data(dev); | |
256 | else | |
257 | data->type = id->driver_data; | |
2d8dd65f AZ |
258 | |
259 | switch (data->type) { | |
2d8dd65f AZ |
260 | case ad7416: |
261 | data->adc_max = 0; | |
337076f9 | 262 | attr_groups = ad7416_groups; |
2d8dd65f AZ |
263 | break; |
264 | ||
265 | case ad7417: | |
266 | data->adc_max = 4; | |
337076f9 | 267 | attr_groups = ad7417_groups; |
2d8dd65f AZ |
268 | break; |
269 | ||
270 | case ad7418: | |
271 | data->adc_max = 1; | |
337076f9 | 272 | attr_groups = ad7418_groups; |
2d8dd65f AZ |
273 | break; |
274 | } | |
275 | ||
337076f9 | 276 | dev_info(dev, "%s chip found\n", client->name); |
2d8dd65f AZ |
277 | |
278 | /* Initialize the AD7418 chip */ | |
279 | ad7418_init_client(client); | |
280 | ||
337076f9 AL |
281 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, |
282 | client->name, | |
283 | data, attr_groups); | |
284 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
2d8dd65f AZ |
285 | } |
286 | ||
991763a9 AL |
287 | static const struct i2c_device_id ad7418_id[] = { |
288 | { "ad7416", ad7416 }, | |
289 | { "ad7417", ad7417 }, | |
290 | { "ad7418", ad7418 }, | |
291 | { } | |
292 | }; | |
293 | MODULE_DEVICE_TABLE(i2c, ad7418_id); | |
294 | ||
f4c2965e LW |
295 | static const struct of_device_id ad7418_dt_ids[] = { |
296 | { .compatible = "adi,ad7416", .data = (void *)ad7416, }, | |
297 | { .compatible = "adi,ad7417", .data = (void *)ad7417, }, | |
298 | { .compatible = "adi,ad7418", .data = (void *)ad7418, }, | |
299 | { } | |
300 | }; | |
301 | MODULE_DEVICE_TABLE(of, ad7418_dt_ids); | |
302 | ||
991763a9 AL |
303 | static struct i2c_driver ad7418_driver = { |
304 | .driver = { | |
305 | .name = "ad7418", | |
f4c2965e | 306 | .of_match_table = ad7418_dt_ids, |
991763a9 AL |
307 | }, |
308 | .probe = ad7418_probe, | |
991763a9 AL |
309 | .id_table = ad7418_id, |
310 | }; | |
311 | ||
f0967eea | 312 | module_i2c_driver(ad7418_driver); |
2d8dd65f AZ |
313 | |
314 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
315 | MODULE_DESCRIPTION("AD7416/17/18 driver"); | |
316 | MODULE_LICENSE("GPL"); | |
317 | MODULE_VERSION(DRV_VERSION); |