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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> |
1da177e4 LT |
26 | |
27 | /* Addresses to scan */ | |
2cdddeb8 | 28 | static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, |
1da177e4 | 29 | 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; |
1da177e4 LT |
30 | |
31 | /* Insmod parameters */ | |
f4b50261 | 32 | I2C_CLIENT_INSMOD_1(pcf8591); |
1da177e4 LT |
33 | |
34 | static int input_mode; | |
35 | module_param(input_mode, int, 0); | |
36 | MODULE_PARM_DESC(input_mode, | |
37 | "Analog input mode:\n" | |
38 | " 0 = four single ended inputs\n" | |
39 | " 1 = three differential inputs\n" | |
40 | " 2 = single ended and differential mixed\n" | |
41 | " 3 = two differential inputs\n"); | |
42 | ||
43 | /* The PCF8591 control byte | |
fb4504fe | 44 | 7 6 5 4 3 2 1 0 |
1da177e4 LT |
45 | | 0 |AOEF| AIP | 0 |AINC| AICH | */ |
46 | ||
47 | /* Analog Output Enable Flag (analog output active if 1) */ | |
48 | #define PCF8591_CONTROL_AOEF 0x40 | |
fb4504fe JD |
49 | |
50 | /* Analog Input Programming | |
1da177e4 LT |
51 | 0x00 = four single ended inputs |
52 | 0x10 = three differential inputs | |
53 | 0x20 = single ended and differential mixed | |
54 | 0x30 = two differential inputs */ | |
55 | #define PCF8591_CONTROL_AIP_MASK 0x30 | |
56 | ||
57 | /* Autoincrement Flag (switch on if 1) */ | |
58 | #define PCF8591_CONTROL_AINC 0x04 | |
59 | ||
60 | /* Channel selection | |
fb4504fe | 61 | 0x00 = channel 0 |
1da177e4 LT |
62 | 0x01 = channel 1 |
63 | 0x02 = channel 2 | |
64 | 0x03 = channel 3 */ | |
65 | #define PCF8591_CONTROL_AICH_MASK 0x03 | |
66 | ||
67 | /* Initial values */ | |
68 | #define PCF8591_INIT_CONTROL ((input_mode << 4) | PCF8591_CONTROL_AOEF) | |
69 | #define PCF8591_INIT_AOUT 0 /* DAC out = 0 */ | |
70 | ||
71 | /* Conversions */ | |
72 | #define REG_TO_SIGNED(reg) (((reg) & 0x80)?((reg) - 256):(reg)) | |
73 | ||
74 | struct pcf8591_data { | |
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 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
172 | static int pcf8591_detect(struct i2c_client *client, int kind, | |
173 | struct i2c_board_info *info) | |
1da177e4 | 174 | { |
8b77e6ac | 175 | struct i2c_adapter *adapter = client->adapter; |
1da177e4 LT |
176 | |
177 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE | |
178 | | I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) | |
8b77e6ac JD |
179 | return -ENODEV; |
180 | ||
181 | /* Now, we would do the remaining detection. But the PCF8591 is plainly | |
182 | impossible to detect! Stupid chip. */ | |
183 | ||
184 | strlcpy(info->type, "pcf8591", I2C_NAME_SIZE); | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
189 | static int pcf8591_probe(struct i2c_client *client, | |
190 | const struct i2c_device_id *id) | |
191 | { | |
192 | struct pcf8591_data *data; | |
193 | int err; | |
1da177e4 | 194 | |
5263ebb5 | 195 | if (!(data = kzalloc(sizeof(struct pcf8591_data), GFP_KERNEL))) { |
1da177e4 LT |
196 | err = -ENOMEM; |
197 | goto exit; | |
198 | } | |
fb4504fe | 199 | |
f741f673 | 200 | i2c_set_clientdata(client, data); |
5c085d36 | 201 | mutex_init(&data->update_lock); |
1da177e4 | 202 | |
1da177e4 | 203 | /* Initialize the PCF8591 chip */ |
f741f673 | 204 | pcf8591_init_client(client); |
1da177e4 LT |
205 | |
206 | /* Register sysfs hooks */ | |
f741f673 | 207 | err = sysfs_create_group(&client->dev.kobj, &pcf8591_attr_group); |
7d9db67f | 208 | if (err) |
8b77e6ac | 209 | goto exit_kfree; |
1da177e4 LT |
210 | |
211 | /* Register input2 if not in "two differential inputs" mode */ | |
7d9db67f | 212 | if (input_mode != 3) { |
f741f673 | 213 | if ((err = device_create_file(&client->dev, |
7d9db67f JD |
214 | &dev_attr_in2_input))) |
215 | goto exit_sysfs_remove; | |
216 | } | |
217 | ||
1da177e4 | 218 | /* Register input3 only in "four single ended inputs" mode */ |
7d9db67f | 219 | if (input_mode == 0) { |
f741f673 | 220 | if ((err = device_create_file(&client->dev, |
7d9db67f JD |
221 | &dev_attr_in3_input))) |
222 | goto exit_sysfs_remove; | |
223 | } | |
224 | ||
1da177e4 | 225 | return 0; |
1da177e4 | 226 | |
7d9db67f | 227 | exit_sysfs_remove: |
f741f673 JD |
228 | sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt); |
229 | sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group); | |
1da177e4 LT |
230 | exit_kfree: |
231 | kfree(data); | |
232 | exit: | |
233 | return err; | |
234 | } | |
235 | ||
8b77e6ac | 236 | static int pcf8591_remove(struct i2c_client *client) |
1da177e4 | 237 | { |
7d9db67f JD |
238 | sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt); |
239 | sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group); | |
1da177e4 LT |
240 | kfree(i2c_get_clientdata(client)); |
241 | return 0; | |
242 | } | |
243 | ||
244 | /* Called when we have found a new PCF8591. */ | |
245 | static void pcf8591_init_client(struct i2c_client *client) | |
246 | { | |
247 | struct pcf8591_data *data = i2c_get_clientdata(client); | |
248 | data->control = PCF8591_INIT_CONTROL; | |
249 | data->aout = PCF8591_INIT_AOUT; | |
250 | ||
251 | i2c_smbus_write_byte_data(client, data->control, data->aout); | |
fb4504fe JD |
252 | |
253 | /* The first byte transmitted contains the conversion code of the | |
1da177e4 LT |
254 | previous read cycle. FLUSH IT! */ |
255 | i2c_smbus_read_byte(client); | |
256 | } | |
257 | ||
258 | static int pcf8591_read_channel(struct device *dev, int channel) | |
259 | { | |
260 | u8 value; | |
261 | struct i2c_client *client = to_i2c_client(dev); | |
262 | struct pcf8591_data *data = i2c_get_clientdata(client); | |
263 | ||
5c085d36 | 264 | mutex_lock(&data->update_lock); |
1da177e4 LT |
265 | |
266 | if ((data->control & PCF8591_CONTROL_AICH_MASK) != channel) { | |
267 | data->control = (data->control & ~PCF8591_CONTROL_AICH_MASK) | |
268 | | channel; | |
269 | i2c_smbus_write_byte(client, data->control); | |
fb4504fe JD |
270 | |
271 | /* The first byte transmitted contains the conversion code of | |
1da177e4 LT |
272 | the previous read cycle. FLUSH IT! */ |
273 | i2c_smbus_read_byte(client); | |
274 | } | |
275 | value = i2c_smbus_read_byte(client); | |
276 | ||
5c085d36 | 277 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
278 | |
279 | if ((channel == 2 && input_mode == 2) || | |
280 | (channel != 3 && (input_mode == 1 || input_mode == 3))) | |
281 | return (10 * REG_TO_SIGNED(value)); | |
282 | else | |
283 | return (10 * value); | |
284 | } | |
285 | ||
8b77e6ac JD |
286 | static const struct i2c_device_id pcf8591_id[] = { |
287 | { "pcf8591", 0 }, | |
288 | { } | |
289 | }; | |
290 | MODULE_DEVICE_TABLE(i2c, pcf8591_id); | |
291 | ||
292 | static struct i2c_driver pcf8591_driver = { | |
293 | .driver = { | |
294 | .name = "pcf8591", | |
295 | }, | |
296 | .probe = pcf8591_probe, | |
297 | .remove = pcf8591_remove, | |
298 | .id_table = pcf8591_id, | |
299 | ||
300 | .class = I2C_CLASS_HWMON, /* Nearest choice */ | |
301 | .detect = pcf8591_detect, | |
302 | .address_data = &addr_data, | |
303 | }; | |
304 | ||
1da177e4 LT |
305 | static int __init pcf8591_init(void) |
306 | { | |
307 | if (input_mode < 0 || input_mode > 3) { | |
308 | printk(KERN_WARNING "pcf8591: invalid input_mode (%d)\n", | |
309 | input_mode); | |
310 | input_mode = 0; | |
311 | } | |
312 | return i2c_add_driver(&pcf8591_driver); | |
313 | } | |
314 | ||
315 | static void __exit pcf8591_exit(void) | |
316 | { | |
317 | i2c_del_driver(&pcf8591_driver); | |
318 | } | |
319 | ||
320 | MODULE_AUTHOR("Aurelien Jarno <aurelien@aurel32.net>"); | |
321 | MODULE_DESCRIPTION("PCF8591 driver"); | |
322 | MODULE_LICENSE("GPL"); | |
323 | ||
324 | module_init(pcf8591_init); | |
325 | module_exit(pcf8591_exit); |