diff options
Diffstat (limited to 'drivers/hwmon')
-rw-r--r-- | drivers/hwmon/Kconfig | 14 | ||||
-rw-r--r-- | drivers/hwmon/Makefile | 1 | ||||
-rw-r--r-- | drivers/hwmon/pcf8591.c | 325 |
3 files changed, 340 insertions, 0 deletions
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 0eb4170cc4af..9a22816b37dd 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig | |||
@@ -635,6 +635,20 @@ config SENSORS_PC87427 | |||
635 | This driver can also be built as a module. If so, the module | 635 | This driver can also be built as a module. If so, the module |
636 | will be called pc87427. | 636 | will be called pc87427. |
637 | 637 | ||
638 | config SENSORS_PCF8591 | ||
639 | tristate "Philips PCF8591 ADC/DAC" | ||
640 | depends on I2C | ||
641 | default n | ||
642 | help | ||
643 | If you say yes here you get support for Philips PCF8591 4-channel | ||
644 | ADC, 1-channel DAC chips. | ||
645 | |||
646 | This driver can also be built as a module. If so, the module | ||
647 | will be called pcf8591. | ||
648 | |||
649 | These devices are hard to detect and rarely found on mainstream | ||
650 | hardware. If unsure, say N. | ||
651 | |||
638 | config SENSORS_SIS5595 | 652 | config SENSORS_SIS5595 |
639 | tristate "Silicon Integrated Systems Corp. SiS5595" | 653 | tristate "Silicon Integrated Systems Corp. SiS5595" |
640 | depends on PCI | 654 | depends on PCI |
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 2e80f37f39eb..e332d6267920 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile | |||
@@ -70,6 +70,7 @@ obj-$(CONFIG_SENSORS_MAX1619) += max1619.o | |||
70 | obj-$(CONFIG_SENSORS_MAX6650) += max6650.o | 70 | obj-$(CONFIG_SENSORS_MAX6650) += max6650.o |
71 | obj-$(CONFIG_SENSORS_PC87360) += pc87360.o | 71 | obj-$(CONFIG_SENSORS_PC87360) += pc87360.o |
72 | obj-$(CONFIG_SENSORS_PC87427) += pc87427.o | 72 | obj-$(CONFIG_SENSORS_PC87427) += pc87427.o |
73 | obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o | ||
73 | obj-$(CONFIG_SENSORS_SIS5595) += sis5595.o | 74 | obj-$(CONFIG_SENSORS_SIS5595) += sis5595.o |
74 | obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o | 75 | obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o |
75 | obj-$(CONFIG_SENSORS_SMSC47M1) += smsc47m1.o | 76 | obj-$(CONFIG_SENSORS_SMSC47M1) += smsc47m1.o |
diff --git a/drivers/hwmon/pcf8591.c b/drivers/hwmon/pcf8591.c new file mode 100644 index 000000000000..1d7ffebd679d --- /dev/null +++ b/drivers/hwmon/pcf8591.c | |||
@@ -0,0 +1,325 @@ | |||
1 | /* | ||
2 | Copyright (C) 2001-2004 Aurelien Jarno <aurelien@aurel32.net> | ||
3 | Ported to Linux 2.6 by Aurelien Jarno <aurelien@aurel32.net> with | ||
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> | ||
25 | #include <linux/mutex.h> | ||
26 | |||
27 | /* Addresses to scan */ | ||
28 | static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, | ||
29 | 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; | ||
30 | |||
31 | /* Insmod parameters */ | ||
32 | I2C_CLIENT_INSMOD_1(pcf8591); | ||
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 | ||
44 | 7 6 5 4 3 2 1 0 | ||
45 | | 0 |AOEF| AIP | 0 |AINC| AICH | */ | ||
46 | |||
47 | /* Analog Output Enable Flag (analog output active if 1) */ | ||
48 | #define PCF8591_CONTROL_AOEF 0x40 | ||
49 | |||
50 | /* Analog Input Programming | ||
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 | ||
61 | 0x00 = channel 0 | ||
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 { | ||
75 | struct mutex update_lock; | ||
76 | |||
77 | u8 control; | ||
78 | u8 aout; | ||
79 | }; | ||
80 | |||
81 | static void pcf8591_init_client(struct i2c_client *client); | ||
82 | static int pcf8591_read_channel(struct device *dev, int channel); | ||
83 | |||
84 | /* following are the sysfs callback functions */ | ||
85 | #define show_in_channel(channel) \ | ||
86 | static ssize_t show_in##channel##_input(struct device *dev, struct device_attribute *attr, char *buf) \ | ||
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 | |||
98 | static ssize_t show_out0_ouput(struct device *dev, struct device_attribute *attr, char *buf) | ||
99 | { | ||
100 | struct pcf8591_data *data = i2c_get_clientdata(to_i2c_client(dev)); | ||
101 | return sprintf(buf, "%d\n", data->aout * 10); | ||
102 | } | ||
103 | |||
104 | static ssize_t set_out0_output(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | ||
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 | |||
117 | static DEVICE_ATTR(out0_output, S_IWUSR | S_IRUGO, | ||
118 | show_out0_ouput, set_out0_output); | ||
119 | |||
120 | static ssize_t show_out0_enable(struct device *dev, struct device_attribute *attr, char *buf) | ||
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 | |||
126 | static ssize_t set_out0_enable(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | ||
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 | |||
132 | mutex_lock(&data->update_lock); | ||
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); | ||
138 | mutex_unlock(&data->update_lock); | ||
139 | return count; | ||
140 | } | ||
141 | |||
142 | static DEVICE_ATTR(out0_enable, S_IWUSR | S_IRUGO, | ||
143 | show_out0_enable, set_out0_enable); | ||
144 | |||
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 | |||
167 | /* | ||
168 | * Real code | ||
169 | */ | ||
170 | |||
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) | ||
174 | { | ||
175 | struct i2c_adapter *adapter = client->adapter; | ||
176 | |||
177 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE | ||
178 | | I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) | ||
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; | ||
194 | |||
195 | if (!(data = kzalloc(sizeof(struct pcf8591_data), GFP_KERNEL))) { | ||
196 | err = -ENOMEM; | ||
197 | goto exit; | ||
198 | } | ||
199 | |||
200 | i2c_set_clientdata(client, data); | ||
201 | mutex_init(&data->update_lock); | ||
202 | |||
203 | /* Initialize the PCF8591 chip */ | ||
204 | pcf8591_init_client(client); | ||
205 | |||
206 | /* Register sysfs hooks */ | ||
207 | err = sysfs_create_group(&client->dev.kobj, &pcf8591_attr_group); | ||
208 | if (err) | ||
209 | goto exit_kfree; | ||
210 | |||
211 | /* Register input2 if not in "two differential inputs" mode */ | ||
212 | if (input_mode != 3) { | ||
213 | if ((err = device_create_file(&client->dev, | ||
214 | &dev_attr_in2_input))) | ||
215 | goto exit_sysfs_remove; | ||
216 | } | ||
217 | |||
218 | /* Register input3 only in "four single ended inputs" mode */ | ||
219 | if (input_mode == 0) { | ||
220 | if ((err = device_create_file(&client->dev, | ||
221 | &dev_attr_in3_input))) | ||
222 | goto exit_sysfs_remove; | ||
223 | } | ||
224 | |||
225 | return 0; | ||
226 | |||
227 | exit_sysfs_remove: | ||
228 | sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt); | ||
229 | sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group); | ||
230 | exit_kfree: | ||
231 | kfree(data); | ||
232 | exit: | ||
233 | return err; | ||
234 | } | ||
235 | |||
236 | static int pcf8591_remove(struct i2c_client *client) | ||
237 | { | ||
238 | sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group_opt); | ||
239 | sysfs_remove_group(&client->dev.kobj, &pcf8591_attr_group); | ||
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); | ||
252 | |||
253 | /* The first byte transmitted contains the conversion code of the | ||
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 | |||
264 | mutex_lock(&data->update_lock); | ||
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); | ||
270 | |||
271 | /* The first byte transmitted contains the conversion code of | ||
272 | the previous read cycle. FLUSH IT! */ | ||
273 | i2c_smbus_read_byte(client); | ||
274 | } | ||
275 | value = i2c_smbus_read_byte(client); | ||
276 | |||
277 | mutex_unlock(&data->update_lock); | ||
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 | |||
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 | |||
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); | ||