Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 | 2 | Copyright (C) 2001-2004 Aurelien Jarno <aurelien@aurel32.net> |
fb4504fe | 3 | Ported to Linux 2.6 by Aurelien Jarno <aurelien@aurel32.net> with |
1da177e4 LT |
4 | the help of Jean Delvare <khali@linux-fr.org> |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/i2c.h> | |
5c085d36 | 25 | #include <linux/mutex.h> |
4275fcd6 JD |
26 | #include <linux/err.h> |
27 | #include <linux/hwmon.h> | |
1da177e4 | 28 | |
1da177e4 | 29 | /* Insmod parameters */ |
1da177e4 LT |
30 | |
31 | static int input_mode; | |
32 | module_param(input_mode, int, 0); | |
33 | MODULE_PARM_DESC(input_mode, | |
34 | "Analog input mode:\n" | |
35 | " 0 = four single ended inputs\n" | |
36 | " 1 = three differential inputs\n" | |
37 | " 2 = single ended and differential mixed\n" | |
38 | " 3 = two differential inputs\n"); | |
39 | ||
40 | /* The PCF8591 control byte | |
fb4504fe | 41 | 7 6 5 4 3 2 1 0 |
1da177e4 LT |
42 | | 0 |AOEF| AIP | 0 |AINC| AICH | */ |
43 | ||
44 | /* Analog Output Enable Flag (analog output active if 1) */ | |
45 | #define PCF8591_CONTROL_AOEF 0x40 | |
fb4504fe JD |
46 | |
47 | /* Analog Input Programming | |
1da177e4 LT |
48 | 0x00 = four single ended inputs |
49 | 0x10 = three differential inputs | |
50 | 0x20 = single ended and differential mixed | |
51 | 0x30 = two differential inputs */ | |
52 | #define PCF8591_CONTROL_AIP_MASK 0x30 | |
53 | ||
54 | /* Autoincrement Flag (switch on if 1) */ | |
55 | #define PCF8591_CONTROL_AINC 0x04 | |
56 | ||
57 | /* Channel selection | |
fb4504fe | 58 | 0x00 = channel 0 |
1da177e4 LT |
59 | 0x01 = channel 1 |
60 | 0x02 = channel 2 | |
61 | 0x03 = channel 3 */ | |
62 | #define PCF8591_CONTROL_AICH_MASK 0x03 | |
63 | ||
64 | /* Initial values */ | |
65 | #define PCF8591_INIT_CONTROL ((input_mode << 4) | PCF8591_CONTROL_AOEF) | |
66 | #define PCF8591_INIT_AOUT 0 /* DAC out = 0 */ | |
67 | ||
68 | /* Conversions */ | |
69 | #define REG_TO_SIGNED(reg) (((reg) & 0x80)?((reg) - 256):(reg)) | |
70 | ||
71 | struct pcf8591_data { | |
4275fcd6 | 72 | struct device *hwmon_dev; |
5c085d36 | 73 | struct mutex update_lock; |
1da177e4 LT |
74 | |
75 | u8 control; | |
76 | u8 aout; | |
77 | }; | |
78 | ||
1da177e4 LT |
79 | static void pcf8591_init_client(struct i2c_client *client); |
80 | static int pcf8591_read_channel(struct device *dev, int channel); | |
81 | ||
1da177e4 LT |
82 | /* following are the sysfs callback functions */ |
83 | #define show_in_channel(channel) \ | |
a5099cfc | 84 | static ssize_t show_in##channel##_input(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
85 | { \ |
86 | return sprintf(buf, "%d\n", pcf8591_read_channel(dev, channel));\ | |
87 | } \ | |
88 | static DEVICE_ATTR(in##channel##_input, S_IRUGO, \ | |
89 | show_in##channel##_input, NULL); | |
90 | ||
91 | show_in_channel(0); | |
92 | show_in_channel(1); | |
93 | show_in_channel(2); | |
94 | show_in_channel(3); | |
95 | ||
a5099cfc | 96 | static ssize_t show_out0_ouput(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
97 | { |
98 | struct pcf8591_data *data = i2c_get_clientdata(to_i2c_client(dev)); | |
99 | return sprintf(buf, "%d\n", data->aout * 10); | |
100 | } | |
101 | ||
a5099cfc | 102 | static ssize_t set_out0_output(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
103 | { |
104 | unsigned int value; | |
105 | struct i2c_client *client = to_i2c_client(dev); | |
106 | struct pcf8591_data *data = i2c_get_clientdata(client); | |
107 | if ((value = (simple_strtoul(buf, NULL, 10) + 5) / 10) <= 255) { | |
108 | data->aout = value; | |
109 | i2c_smbus_write_byte_data(client, data->control, data->aout); | |
110 | return count; | |
111 | } | |
112 | return -EINVAL; | |
113 | } | |
114 | ||
fb4504fe | 115 | static DEVICE_ATTR(out0_output, S_IWUSR | S_IRUGO, |
1da177e4 LT |
116 | show_out0_ouput, set_out0_output); |
117 | ||
a5099cfc | 118 | static ssize_t show_out0_enable(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
119 | { |
120 | struct pcf8591_data *data = i2c_get_clientdata(to_i2c_client(dev)); | |
121 | return sprintf(buf, "%u\n", !(!(data->control & PCF8591_CONTROL_AOEF))); | |
122 | } | |
123 | ||
a5099cfc | 124 | static ssize_t set_out0_enable(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
125 | { |
126 | struct i2c_client *client = to_i2c_client(dev); | |
127 | struct pcf8591_data *data = i2c_get_clientdata(client); | |
128 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
129 | ||
5c085d36 | 130 | mutex_lock(&data->update_lock); |
1da177e4 LT |
131 | if (val) |
132 | data->control |= PCF8591_CONTROL_AOEF; | |
133 | else | |
134 | data->control &= ~PCF8591_CONTROL_AOEF; | |
135 | i2c_smbus_write_byte(client, data->control); | |
5c085d36 | 136 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
137 | return count; |
138 | } | |
139 | ||
fb4504fe | 140 | static DEVICE_ATTR(out0_enable, S_IWUSR | S_IRUGO, |
1da177e4 LT |
141 | show_out0_enable, set_out0_enable); |
142 | ||
7d9db67f JD |
143 | static struct attribute *pcf8591_attributes[] = { |
144 | &dev_attr_out0_enable.attr, | |
145 | &dev_attr_out0_output.attr, | |
146 | &dev_attr_in0_input.attr, | |
147 | &dev_attr_in1_input.attr, | |
148 | NULL | |
149 | }; | |
150 | ||
151 | static const struct attribute_group pcf8591_attr_group = { | |
152 | .attrs = pcf8591_attributes, | |
153 | }; | |
154 | ||
155 | static struct attribute *pcf8591_attributes_opt[] = { | |
156 | &dev_attr_in2_input.attr, | |
157 | &dev_attr_in3_input.attr, | |
158 | NULL | |
159 | }; | |
160 | ||
161 | static const struct attribute_group pcf8591_attr_group_opt = { | |
162 | .attrs = pcf8591_attributes_opt, | |
163 | }; | |
164 | ||
1da177e4 LT |
165 | /* |
166 | * Real code | |
167 | */ | |
1da177e4 | 168 | |
8b77e6ac JD |
169 | static int pcf8591_probe(struct i2c_client *client, |
170 | const struct i2c_device_id *id) | |
171 | { | |
172 | struct pcf8591_data *data; | |
173 | int err; | |
1da177e4 | 174 | |
5263ebb5 | 175 | if (!(data = kzalloc(sizeof(struct pcf8591_data), GFP_KERNEL))) { |
1da177e4 LT |
176 | err = -ENOMEM; |
177 | goto exit; | |
178 | } | |
fb4504fe | 179 | |
f741f673 | 180 | i2c_set_clientdata(client, data); |
5c085d36 | 181 | mutex_init(&data->update_lock); |
1da177e4 | 182 | |
1da177e4 | 183 | /* Initialize the PCF8591 chip */ |
f741f673 | 184 | pcf8591_init_client(client); |
1da177e4 LT |
185 | |
186 | /* Register sysfs hooks */ | |
f741f673 | 187 | err = sysfs_create_group(&client->dev.kobj, &pcf8591_attr_group); |
7d9db67f | 188 | if (err) |
8b77e6ac | 189 | goto exit_kfree; |
1da177e4 LT |
190 | |
191 | /* Register input2 if not in "two differential inputs" mode */ | |
7d9db67f | 192 | if (input_mode != 3) { |
f741f673 | 193 | if ((err = device_create_file(&client->dev, |
7d9db67f JD |
194 | &dev_attr_in2_input))) |
195 | goto exit_sysfs_remove; | |
196 | } | |
197 | ||
1da177e4 | 198 | /* Register input3 only in "four single ended inputs" mode */ |
7d9db67f | 199 | if (input_mode == 0) { |
f741f673 | 200 | if ((err = device_create_file(&client->dev, |
7d9db67f JD |
201 | &dev_attr_in3_input))) |
202 | goto exit_sysfs_remove; | |
203 | } | |
204 | ||
4275fcd6 JD |
205 | data->hwmon_dev = hwmon_device_register(&client->dev); |
206 | if (IS_ERR(data->hwmon_dev)) { | |
207 | err = PTR_ERR(data->hwmon_dev); | |
208 | goto exit_sysfs_remove; | |
209 | } | |
210 | ||
1da177e4 | 211 | return 0; |
1da177e4 | 212 | |
7d9db67f | 213 | exit_sysfs_remove: |
f741f673 JD |
214 | sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt); |
215 | sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group); | |
1da177e4 LT |
216 | exit_kfree: |
217 | kfree(data); | |
218 | exit: | |
219 | return err; | |
220 | } | |
221 | ||
8b77e6ac | 222 | static int pcf8591_remove(struct i2c_client *client) |
1da177e4 | 223 | { |
4275fcd6 JD |
224 | struct pcf8591_data *data = i2c_get_clientdata(client); |
225 | ||
226 | hwmon_device_unregister(data->hwmon_dev); | |
7d9db67f JD |
227 | sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt); |
228 | sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group); | |
1da177e4 LT |
229 | kfree(i2c_get_clientdata(client)); |
230 | return 0; | |
231 | } | |
232 | ||
233 | /* Called when we have found a new PCF8591. */ | |
234 | static void pcf8591_init_client(struct i2c_client *client) | |
235 | { | |
236 | struct pcf8591_data *data = i2c_get_clientdata(client); | |
237 | data->control = PCF8591_INIT_CONTROL; | |
238 | data->aout = PCF8591_INIT_AOUT; | |
239 | ||
240 | i2c_smbus_write_byte_data(client, data->control, data->aout); | |
fb4504fe JD |
241 | |
242 | /* The first byte transmitted contains the conversion code of the | |
1da177e4 LT |
243 | previous read cycle. FLUSH IT! */ |
244 | i2c_smbus_read_byte(client); | |
245 | } | |
246 | ||
247 | static int pcf8591_read_channel(struct device *dev, int channel) | |
248 | { | |
249 | u8 value; | |
250 | struct i2c_client *client = to_i2c_client(dev); | |
251 | struct pcf8591_data *data = i2c_get_clientdata(client); | |
252 | ||
5c085d36 | 253 | mutex_lock(&data->update_lock); |
1da177e4 LT |
254 | |
255 | if ((data->control & PCF8591_CONTROL_AICH_MASK) != channel) { | |
256 | data->control = (data->control & ~PCF8591_CONTROL_AICH_MASK) | |
257 | | channel; | |
258 | i2c_smbus_write_byte(client, data->control); | |
fb4504fe JD |
259 | |
260 | /* The first byte transmitted contains the conversion code of | |
1da177e4 LT |
261 | the previous read cycle. FLUSH IT! */ |
262 | i2c_smbus_read_byte(client); | |
263 | } | |
264 | value = i2c_smbus_read_byte(client); | |
265 | ||
5c085d36 | 266 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
267 | |
268 | if ((channel == 2 && input_mode == 2) || | |
269 | (channel != 3 && (input_mode == 1 || input_mode == 3))) | |
270 | return (10 * REG_TO_SIGNED(value)); | |
271 | else | |
272 | return (10 * value); | |
273 | } | |
274 | ||
8b77e6ac JD |
275 | static const struct i2c_device_id pcf8591_id[] = { |
276 | { "pcf8591", 0 }, | |
277 | { } | |
278 | }; | |
279 | MODULE_DEVICE_TABLE(i2c, pcf8591_id); | |
280 | ||
281 | static struct i2c_driver pcf8591_driver = { | |
282 | .driver = { | |
283 | .name = "pcf8591", | |
284 | }, | |
285 | .probe = pcf8591_probe, | |
286 | .remove = pcf8591_remove, | |
287 | .id_table = pcf8591_id, | |
8b77e6ac JD |
288 | }; |
289 | ||
1da177e4 LT |
290 | static int __init pcf8591_init(void) |
291 | { | |
292 | if (input_mode < 0 || input_mode > 3) { | |
293 | printk(KERN_WARNING "pcf8591: invalid input_mode (%d)\n", | |
294 | input_mode); | |
295 | input_mode = 0; | |
296 | } | |
297 | return i2c_add_driver(&pcf8591_driver); | |
298 | } | |
299 | ||
300 | static void __exit pcf8591_exit(void) | |
301 | { | |
302 | i2c_del_driver(&pcf8591_driver); | |
303 | } | |
304 | ||
305 | MODULE_AUTHOR("Aurelien Jarno <aurelien@aurel32.net>"); | |
306 | MODULE_DESCRIPTION("PCF8591 driver"); | |
307 | MODULE_LICENSE("GPL"); | |
308 | ||
309 | module_init(pcf8591_init); | |
310 | module_exit(pcf8591_exit); |