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 | ||
2caec134 JP |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
1da177e4 LT |
23 | #include <linux/module.h> |
24 | #include <linux/init.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/i2c.h> | |
5c085d36 | 27 | #include <linux/mutex.h> |
4275fcd6 JD |
28 | #include <linux/err.h> |
29 | #include <linux/hwmon.h> | |
1da177e4 | 30 | |
1da177e4 | 31 | /* Insmod parameters */ |
1da177e4 LT |
32 | |
33 | static int input_mode; | |
34 | module_param(input_mode, int, 0); | |
35 | MODULE_PARM_DESC(input_mode, | |
36 | "Analog input mode:\n" | |
37 | " 0 = four single ended inputs\n" | |
38 | " 1 = three differential inputs\n" | |
39 | " 2 = single ended and differential mixed\n" | |
40 | " 3 = two differential inputs\n"); | |
41 | ||
42 | /* The PCF8591 control byte | |
fb4504fe | 43 | 7 6 5 4 3 2 1 0 |
1da177e4 LT |
44 | | 0 |AOEF| AIP | 0 |AINC| AICH | */ |
45 | ||
46 | /* Analog Output Enable Flag (analog output active if 1) */ | |
47 | #define PCF8591_CONTROL_AOEF 0x40 | |
fb4504fe JD |
48 | |
49 | /* Analog Input Programming | |
1da177e4 LT |
50 | 0x00 = four single ended inputs |
51 | 0x10 = three differential inputs | |
52 | 0x20 = single ended and differential mixed | |
53 | 0x30 = two differential inputs */ | |
54 | #define PCF8591_CONTROL_AIP_MASK 0x30 | |
55 | ||
56 | /* Autoincrement Flag (switch on if 1) */ | |
57 | #define PCF8591_CONTROL_AINC 0x04 | |
58 | ||
59 | /* Channel selection | |
fb4504fe | 60 | 0x00 = channel 0 |
1da177e4 LT |
61 | 0x01 = channel 1 |
62 | 0x02 = channel 2 | |
63 | 0x03 = channel 3 */ | |
64 | #define PCF8591_CONTROL_AICH_MASK 0x03 | |
65 | ||
66 | /* Initial values */ | |
67 | #define PCF8591_INIT_CONTROL ((input_mode << 4) | PCF8591_CONTROL_AOEF) | |
68 | #define PCF8591_INIT_AOUT 0 /* DAC out = 0 */ | |
69 | ||
70 | /* Conversions */ | |
71 | #define REG_TO_SIGNED(reg) (((reg) & 0x80)?((reg) - 256):(reg)) | |
72 | ||
73 | struct pcf8591_data { | |
4275fcd6 | 74 | struct device *hwmon_dev; |
5c085d36 | 75 | struct mutex update_lock; |
1da177e4 LT |
76 | |
77 | u8 control; | |
78 | u8 aout; | |
79 | }; | |
80 | ||
1da177e4 LT |
81 | static void pcf8591_init_client(struct i2c_client *client); |
82 | static int pcf8591_read_channel(struct device *dev, int channel); | |
83 | ||
1da177e4 LT |
84 | /* following are the sysfs callback functions */ |
85 | #define show_in_channel(channel) \ | |
a5099cfc | 86 | static ssize_t show_in##channel##_input(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
87 | { \ |
88 | return sprintf(buf, "%d\n", pcf8591_read_channel(dev, channel));\ | |
89 | } \ | |
90 | static DEVICE_ATTR(in##channel##_input, S_IRUGO, \ | |
91 | show_in##channel##_input, NULL); | |
92 | ||
93 | show_in_channel(0); | |
94 | show_in_channel(1); | |
95 | show_in_channel(2); | |
96 | show_in_channel(3); | |
97 | ||
a5099cfc | 98 | static ssize_t show_out0_ouput(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
99 | { |
100 | struct pcf8591_data *data = i2c_get_clientdata(to_i2c_client(dev)); | |
101 | return sprintf(buf, "%d\n", data->aout * 10); | |
102 | } | |
103 | ||
a5099cfc | 104 | static ssize_t set_out0_output(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
105 | { |
106 | unsigned int value; | |
107 | struct i2c_client *client = to_i2c_client(dev); | |
108 | struct pcf8591_data *data = i2c_get_clientdata(client); | |
109 | if ((value = (simple_strtoul(buf, NULL, 10) + 5) / 10) <= 255) { | |
110 | data->aout = value; | |
111 | i2c_smbus_write_byte_data(client, data->control, data->aout); | |
112 | return count; | |
113 | } | |
114 | return -EINVAL; | |
115 | } | |
116 | ||
fb4504fe | 117 | static DEVICE_ATTR(out0_output, S_IWUSR | S_IRUGO, |
1da177e4 LT |
118 | show_out0_ouput, set_out0_output); |
119 | ||
a5099cfc | 120 | static ssize_t show_out0_enable(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
121 | { |
122 | struct pcf8591_data *data = i2c_get_clientdata(to_i2c_client(dev)); | |
123 | return sprintf(buf, "%u\n", !(!(data->control & PCF8591_CONTROL_AOEF))); | |
124 | } | |
125 | ||
a5099cfc | 126 | static ssize_t set_out0_enable(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
127 | { |
128 | struct i2c_client *client = to_i2c_client(dev); | |
129 | struct pcf8591_data *data = i2c_get_clientdata(client); | |
130 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
131 | ||
5c085d36 | 132 | mutex_lock(&data->update_lock); |
1da177e4 LT |
133 | if (val) |
134 | data->control |= PCF8591_CONTROL_AOEF; | |
135 | else | |
136 | data->control &= ~PCF8591_CONTROL_AOEF; | |
137 | i2c_smbus_write_byte(client, data->control); | |
5c085d36 | 138 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
139 | return count; |
140 | } | |
141 | ||
fb4504fe | 142 | static DEVICE_ATTR(out0_enable, S_IWUSR | S_IRUGO, |
1da177e4 LT |
143 | show_out0_enable, set_out0_enable); |
144 | ||
7d9db67f JD |
145 | static struct attribute *pcf8591_attributes[] = { |
146 | &dev_attr_out0_enable.attr, | |
147 | &dev_attr_out0_output.attr, | |
148 | &dev_attr_in0_input.attr, | |
149 | &dev_attr_in1_input.attr, | |
150 | NULL | |
151 | }; | |
152 | ||
153 | static const struct attribute_group pcf8591_attr_group = { | |
154 | .attrs = pcf8591_attributes, | |
155 | }; | |
156 | ||
157 | static struct attribute *pcf8591_attributes_opt[] = { | |
158 | &dev_attr_in2_input.attr, | |
159 | &dev_attr_in3_input.attr, | |
160 | NULL | |
161 | }; | |
162 | ||
163 | static const struct attribute_group pcf8591_attr_group_opt = { | |
164 | .attrs = pcf8591_attributes_opt, | |
165 | }; | |
166 | ||
1da177e4 LT |
167 | /* |
168 | * Real code | |
169 | */ | |
1da177e4 | 170 | |
8b77e6ac JD |
171 | static int pcf8591_probe(struct i2c_client *client, |
172 | const struct i2c_device_id *id) | |
173 | { | |
174 | struct pcf8591_data *data; | |
175 | int err; | |
1da177e4 | 176 | |
5263ebb5 | 177 | if (!(data = kzalloc(sizeof(struct pcf8591_data), GFP_KERNEL))) { |
1da177e4 LT |
178 | err = -ENOMEM; |
179 | goto exit; | |
180 | } | |
fb4504fe | 181 | |
f741f673 | 182 | i2c_set_clientdata(client, data); |
5c085d36 | 183 | mutex_init(&data->update_lock); |
1da177e4 | 184 | |
1da177e4 | 185 | /* Initialize the PCF8591 chip */ |
f741f673 | 186 | pcf8591_init_client(client); |
1da177e4 LT |
187 | |
188 | /* Register sysfs hooks */ | |
f741f673 | 189 | err = sysfs_create_group(&client->dev.kobj, &pcf8591_attr_group); |
7d9db67f | 190 | if (err) |
8b77e6ac | 191 | goto exit_kfree; |
1da177e4 LT |
192 | |
193 | /* Register input2 if not in "two differential inputs" mode */ | |
7d9db67f | 194 | if (input_mode != 3) { |
f741f673 | 195 | if ((err = device_create_file(&client->dev, |
7d9db67f JD |
196 | &dev_attr_in2_input))) |
197 | goto exit_sysfs_remove; | |
198 | } | |
199 | ||
1da177e4 | 200 | /* Register input3 only in "four single ended inputs" mode */ |
7d9db67f | 201 | if (input_mode == 0) { |
f741f673 | 202 | if ((err = device_create_file(&client->dev, |
7d9db67f JD |
203 | &dev_attr_in3_input))) |
204 | goto exit_sysfs_remove; | |
205 | } | |
206 | ||
4275fcd6 JD |
207 | data->hwmon_dev = hwmon_device_register(&client->dev); |
208 | if (IS_ERR(data->hwmon_dev)) { | |
209 | err = PTR_ERR(data->hwmon_dev); | |
210 | goto exit_sysfs_remove; | |
211 | } | |
212 | ||
1da177e4 | 213 | return 0; |
1da177e4 | 214 | |
7d9db67f | 215 | exit_sysfs_remove: |
f741f673 JD |
216 | sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt); |
217 | sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group); | |
1da177e4 LT |
218 | exit_kfree: |
219 | kfree(data); | |
220 | exit: | |
221 | return err; | |
222 | } | |
223 | ||
8b77e6ac | 224 | static int pcf8591_remove(struct i2c_client *client) |
1da177e4 | 225 | { |
4275fcd6 JD |
226 | struct pcf8591_data *data = i2c_get_clientdata(client); |
227 | ||
228 | hwmon_device_unregister(data->hwmon_dev); | |
7d9db67f JD |
229 | sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt); |
230 | sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group); | |
1da177e4 LT |
231 | kfree(i2c_get_clientdata(client)); |
232 | return 0; | |
233 | } | |
234 | ||
235 | /* Called when we have found a new PCF8591. */ | |
236 | static void pcf8591_init_client(struct i2c_client *client) | |
237 | { | |
238 | struct pcf8591_data *data = i2c_get_clientdata(client); | |
239 | data->control = PCF8591_INIT_CONTROL; | |
240 | data->aout = PCF8591_INIT_AOUT; | |
241 | ||
242 | i2c_smbus_write_byte_data(client, data->control, data->aout); | |
fb4504fe JD |
243 | |
244 | /* The first byte transmitted contains the conversion code of the | |
1da177e4 LT |
245 | previous read cycle. FLUSH IT! */ |
246 | i2c_smbus_read_byte(client); | |
247 | } | |
248 | ||
249 | static int pcf8591_read_channel(struct device *dev, int channel) | |
250 | { | |
251 | u8 value; | |
252 | struct i2c_client *client = to_i2c_client(dev); | |
253 | struct pcf8591_data *data = i2c_get_clientdata(client); | |
254 | ||
5c085d36 | 255 | mutex_lock(&data->update_lock); |
1da177e4 LT |
256 | |
257 | if ((data->control & PCF8591_CONTROL_AICH_MASK) != channel) { | |
258 | data->control = (data->control & ~PCF8591_CONTROL_AICH_MASK) | |
259 | | channel; | |
260 | i2c_smbus_write_byte(client, data->control); | |
fb4504fe JD |
261 | |
262 | /* The first byte transmitted contains the conversion code of | |
1da177e4 LT |
263 | the previous read cycle. FLUSH IT! */ |
264 | i2c_smbus_read_byte(client); | |
265 | } | |
266 | value = i2c_smbus_read_byte(client); | |
267 | ||
5c085d36 | 268 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
269 | |
270 | if ((channel == 2 && input_mode == 2) || | |
271 | (channel != 3 && (input_mode == 1 || input_mode == 3))) | |
272 | return (10 * REG_TO_SIGNED(value)); | |
273 | else | |
274 | return (10 * value); | |
275 | } | |
276 | ||
8b77e6ac JD |
277 | static const struct i2c_device_id pcf8591_id[] = { |
278 | { "pcf8591", 0 }, | |
279 | { } | |
280 | }; | |
281 | MODULE_DEVICE_TABLE(i2c, pcf8591_id); | |
282 | ||
283 | static struct i2c_driver pcf8591_driver = { | |
284 | .driver = { | |
285 | .name = "pcf8591", | |
286 | }, | |
287 | .probe = pcf8591_probe, | |
288 | .remove = pcf8591_remove, | |
289 | .id_table = pcf8591_id, | |
8b77e6ac JD |
290 | }; |
291 | ||
1da177e4 LT |
292 | static int __init pcf8591_init(void) |
293 | { | |
294 | if (input_mode < 0 || input_mode > 3) { | |
2caec134 | 295 | pr_warn("invalid input_mode (%d)\n", input_mode); |
1da177e4 LT |
296 | input_mode = 0; |
297 | } | |
298 | return i2c_add_driver(&pcf8591_driver); | |
299 | } | |
300 | ||
301 | static void __exit pcf8591_exit(void) | |
302 | { | |
303 | i2c_del_driver(&pcf8591_driver); | |
304 | } | |
305 | ||
306 | MODULE_AUTHOR("Aurelien Jarno <aurelien@aurel32.net>"); | |
307 | MODULE_DESCRIPTION("PCF8591 driver"); | |
308 | MODULE_LICENSE("GPL"); | |
309 | ||
310 | module_init(pcf8591_init); | |
311 | module_exit(pcf8591_exit); |