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6e34b187 IS |
1 | /* |
2 | * Driver for Linear Technology LTC4245 I2C Multiple Supply Hot Swap Controller | |
3 | * | |
4 | * Copyright (C) 2008 Ira W. Snyder <iws@ovro.caltech.edu> | |
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; version 2 of the License. | |
9 | * | |
10 | * This driver is based on the ds1621 and ina209 drivers. | |
11 | * | |
12 | * Datasheet: | |
13 | * http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1006,C1140,P19392,D13517 | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/err.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/i2c.h> | |
22 | #include <linux/hwmon.h> | |
23 | #include <linux/hwmon-sysfs.h> | |
24 | ||
25 | /* Valid addresses are 0x20 - 0x3f | |
26 | * | |
27 | * For now, we do not probe, since some of these addresses | |
28 | * are known to be unfriendly to probing */ | |
29 | static const unsigned short normal_i2c[] = { I2C_CLIENT_END }; | |
30 | ||
31 | /* Insmod parameters */ | |
32 | I2C_CLIENT_INSMOD_1(ltc4245); | |
33 | ||
34 | /* Here are names of the chip's registers (a.k.a. commands) */ | |
35 | enum ltc4245_cmd { | |
36 | LTC4245_STATUS = 0x00, /* readonly */ | |
37 | LTC4245_ALERT = 0x01, | |
38 | LTC4245_CONTROL = 0x02, | |
39 | LTC4245_ON = 0x03, | |
40 | LTC4245_FAULT1 = 0x04, | |
41 | LTC4245_FAULT2 = 0x05, | |
42 | LTC4245_GPIO = 0x06, | |
43 | LTC4245_ADCADR = 0x07, | |
44 | ||
45 | LTC4245_12VIN = 0x10, | |
46 | LTC4245_12VSENSE = 0x11, | |
47 | LTC4245_12VOUT = 0x12, | |
48 | LTC4245_5VIN = 0x13, | |
49 | LTC4245_5VSENSE = 0x14, | |
50 | LTC4245_5VOUT = 0x15, | |
51 | LTC4245_3VIN = 0x16, | |
52 | LTC4245_3VSENSE = 0x17, | |
53 | LTC4245_3VOUT = 0x18, | |
54 | LTC4245_VEEIN = 0x19, | |
55 | LTC4245_VEESENSE = 0x1a, | |
56 | LTC4245_VEEOUT = 0x1b, | |
57 | LTC4245_GPIOADC1 = 0x1c, | |
58 | LTC4245_GPIOADC2 = 0x1d, | |
59 | LTC4245_GPIOADC3 = 0x1e, | |
60 | }; | |
61 | ||
62 | struct ltc4245_data { | |
63 | struct device *hwmon_dev; | |
64 | ||
65 | struct mutex update_lock; | |
66 | bool valid; | |
67 | unsigned long last_updated; /* in jiffies */ | |
68 | ||
69 | /* Control registers */ | |
70 | u8 cregs[0x08]; | |
71 | ||
72 | /* Voltage registers */ | |
73 | u8 vregs[0x0f]; | |
74 | }; | |
75 | ||
76 | static struct ltc4245_data *ltc4245_update_device(struct device *dev) | |
77 | { | |
78 | struct i2c_client *client = to_i2c_client(dev); | |
79 | struct ltc4245_data *data = i2c_get_clientdata(client); | |
80 | s32 val; | |
81 | int i; | |
82 | ||
83 | mutex_lock(&data->update_lock); | |
84 | ||
85 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
86 | ||
87 | dev_dbg(&client->dev, "Starting ltc4245 update\n"); | |
88 | ||
89 | /* Read control registers -- 0x00 to 0x07 */ | |
90 | for (i = 0; i < ARRAY_SIZE(data->cregs); i++) { | |
91 | val = i2c_smbus_read_byte_data(client, i); | |
92 | if (unlikely(val < 0)) | |
93 | data->cregs[i] = 0; | |
94 | else | |
95 | data->cregs[i] = val; | |
96 | } | |
97 | ||
98 | /* Read voltage registers -- 0x10 to 0x1f */ | |
99 | for (i = 0; i < ARRAY_SIZE(data->vregs); i++) { | |
100 | val = i2c_smbus_read_byte_data(client, i+0x10); | |
101 | if (unlikely(val < 0)) | |
102 | data->vregs[i] = 0; | |
103 | else | |
104 | data->vregs[i] = val; | |
105 | } | |
106 | ||
107 | data->last_updated = jiffies; | |
108 | data->valid = 1; | |
109 | } | |
110 | ||
111 | mutex_unlock(&data->update_lock); | |
112 | ||
113 | return data; | |
114 | } | |
115 | ||
116 | /* Return the voltage from the given register in millivolts */ | |
117 | static int ltc4245_get_voltage(struct device *dev, u8 reg) | |
118 | { | |
119 | struct ltc4245_data *data = ltc4245_update_device(dev); | |
120 | const u8 regval = data->vregs[reg - 0x10]; | |
121 | u32 voltage = 0; | |
122 | ||
123 | switch (reg) { | |
124 | case LTC4245_12VIN: | |
125 | case LTC4245_12VOUT: | |
126 | voltage = regval * 55; | |
127 | break; | |
128 | case LTC4245_5VIN: | |
129 | case LTC4245_5VOUT: | |
130 | voltage = regval * 22; | |
131 | break; | |
132 | case LTC4245_3VIN: | |
133 | case LTC4245_3VOUT: | |
134 | voltage = regval * 15; | |
135 | break; | |
136 | case LTC4245_VEEIN: | |
137 | case LTC4245_VEEOUT: | |
138 | voltage = regval * -55; | |
139 | break; | |
140 | case LTC4245_GPIOADC1: | |
141 | case LTC4245_GPIOADC2: | |
142 | case LTC4245_GPIOADC3: | |
143 | voltage = regval * 10; | |
144 | break; | |
145 | default: | |
146 | /* If we get here, the developer messed up */ | |
147 | WARN_ON_ONCE(1); | |
148 | break; | |
149 | } | |
150 | ||
151 | return voltage; | |
152 | } | |
153 | ||
154 | /* Return the current in the given sense register in milliAmperes */ | |
155 | static unsigned int ltc4245_get_current(struct device *dev, u8 reg) | |
156 | { | |
157 | struct ltc4245_data *data = ltc4245_update_device(dev); | |
158 | const u8 regval = data->vregs[reg - 0x10]; | |
159 | unsigned int voltage; | |
160 | unsigned int curr; | |
161 | ||
162 | /* The strange looking conversions that follow are fixed-point | |
163 | * math, since we cannot do floating point in the kernel. | |
164 | * | |
165 | * Step 1: convert sense register to microVolts | |
166 | * Step 2: convert voltage to milliAmperes | |
167 | * | |
168 | * If you play around with the V=IR equation, you come up with | |
169 | * the following: X uV / Y mOhm == Z mA | |
170 | * | |
171 | * With the resistors that are fractions of a milliOhm, we multiply | |
172 | * the voltage and resistance by 10, to shift the decimal point. | |
173 | * Now we can use the normal division operator again. | |
174 | */ | |
175 | ||
176 | switch (reg) { | |
177 | case LTC4245_12VSENSE: | |
178 | voltage = regval * 250; /* voltage in uV */ | |
179 | curr = voltage / 50; /* sense resistor 50 mOhm */ | |
180 | break; | |
181 | case LTC4245_5VSENSE: | |
182 | voltage = regval * 125; /* voltage in uV */ | |
183 | curr = (voltage * 10) / 35; /* sense resistor 3.5 mOhm */ | |
184 | break; | |
185 | case LTC4245_3VSENSE: | |
186 | voltage = regval * 125; /* voltage in uV */ | |
187 | curr = (voltage * 10) / 25; /* sense resistor 2.5 mOhm */ | |
188 | break; | |
189 | case LTC4245_VEESENSE: | |
190 | voltage = regval * 250; /* voltage in uV */ | |
191 | curr = voltage / 100; /* sense resistor 100 mOhm */ | |
192 | break; | |
193 | default: | |
194 | /* If we get here, the developer messed up */ | |
195 | WARN_ON_ONCE(1); | |
196 | curr = 0; | |
197 | break; | |
198 | } | |
199 | ||
200 | return curr; | |
201 | } | |
202 | ||
203 | static ssize_t ltc4245_show_voltage(struct device *dev, | |
204 | struct device_attribute *da, | |
205 | char *buf) | |
206 | { | |
207 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
208 | const int voltage = ltc4245_get_voltage(dev, attr->index); | |
209 | ||
210 | return snprintf(buf, PAGE_SIZE, "%d\n", voltage); | |
211 | } | |
212 | ||
213 | static ssize_t ltc4245_show_current(struct device *dev, | |
214 | struct device_attribute *da, | |
215 | char *buf) | |
216 | { | |
217 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
218 | const unsigned int curr = ltc4245_get_current(dev, attr->index); | |
219 | ||
220 | return snprintf(buf, PAGE_SIZE, "%u\n", curr); | |
221 | } | |
222 | ||
223 | static ssize_t ltc4245_show_power(struct device *dev, | |
224 | struct device_attribute *da, | |
225 | char *buf) | |
226 | { | |
227 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
228 | const unsigned int curr = ltc4245_get_current(dev, attr->index); | |
229 | const int output_voltage = ltc4245_get_voltage(dev, attr->index+1); | |
230 | ||
231 | /* current in mA * voltage in mV == power in uW */ | |
232 | const unsigned int power = abs(output_voltage * curr); | |
233 | ||
234 | return snprintf(buf, PAGE_SIZE, "%u\n", power); | |
235 | } | |
236 | ||
237 | static ssize_t ltc4245_show_alarm(struct device *dev, | |
238 | struct device_attribute *da, | |
239 | char *buf) | |
240 | { | |
241 | struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da); | |
242 | struct ltc4245_data *data = ltc4245_update_device(dev); | |
243 | const u8 reg = data->cregs[attr->index]; | |
244 | const u32 mask = attr->nr; | |
245 | ||
246 | return snprintf(buf, PAGE_SIZE, "%u\n", (reg & mask) ? 1 : 0); | |
247 | } | |
248 | ||
249 | /* These macros are used below in constructing device attribute objects | |
250 | * for use with sysfs_create_group() to make a sysfs device file | |
251 | * for each register. | |
252 | */ | |
253 | ||
254 | #define LTC4245_VOLTAGE(name, ltc4245_cmd_idx) \ | |
255 | static SENSOR_DEVICE_ATTR(name, S_IRUGO, \ | |
256 | ltc4245_show_voltage, NULL, ltc4245_cmd_idx) | |
257 | ||
258 | #define LTC4245_CURRENT(name, ltc4245_cmd_idx) \ | |
259 | static SENSOR_DEVICE_ATTR(name, S_IRUGO, \ | |
260 | ltc4245_show_current, NULL, ltc4245_cmd_idx) | |
261 | ||
262 | #define LTC4245_POWER(name, ltc4245_cmd_idx) \ | |
263 | static SENSOR_DEVICE_ATTR(name, S_IRUGO, \ | |
264 | ltc4245_show_power, NULL, ltc4245_cmd_idx) | |
265 | ||
266 | #define LTC4245_ALARM(name, mask, reg) \ | |
267 | static SENSOR_DEVICE_ATTR_2(name, S_IRUGO, \ | |
268 | ltc4245_show_alarm, NULL, (mask), reg) | |
269 | ||
270 | /* Construct a sensor_device_attribute structure for each register */ | |
271 | ||
272 | /* Input voltages */ | |
273 | LTC4245_VOLTAGE(in1_input, LTC4245_12VIN); | |
274 | LTC4245_VOLTAGE(in2_input, LTC4245_5VIN); | |
275 | LTC4245_VOLTAGE(in3_input, LTC4245_3VIN); | |
276 | LTC4245_VOLTAGE(in4_input, LTC4245_VEEIN); | |
277 | ||
278 | /* Input undervoltage alarms */ | |
279 | LTC4245_ALARM(in1_min_alarm, (1 << 0), LTC4245_FAULT1); | |
280 | LTC4245_ALARM(in2_min_alarm, (1 << 1), LTC4245_FAULT1); | |
281 | LTC4245_ALARM(in3_min_alarm, (1 << 2), LTC4245_FAULT1); | |
282 | LTC4245_ALARM(in4_min_alarm, (1 << 3), LTC4245_FAULT1); | |
283 | ||
284 | /* Currents (via sense resistor) */ | |
285 | LTC4245_CURRENT(curr1_input, LTC4245_12VSENSE); | |
286 | LTC4245_CURRENT(curr2_input, LTC4245_5VSENSE); | |
287 | LTC4245_CURRENT(curr3_input, LTC4245_3VSENSE); | |
288 | LTC4245_CURRENT(curr4_input, LTC4245_VEESENSE); | |
289 | ||
290 | /* Overcurrent alarms */ | |
291 | LTC4245_ALARM(curr1_max_alarm, (1 << 4), LTC4245_FAULT1); | |
292 | LTC4245_ALARM(curr2_max_alarm, (1 << 5), LTC4245_FAULT1); | |
293 | LTC4245_ALARM(curr3_max_alarm, (1 << 6), LTC4245_FAULT1); | |
294 | LTC4245_ALARM(curr4_max_alarm, (1 << 7), LTC4245_FAULT1); | |
295 | ||
296 | /* Output voltages */ | |
297 | LTC4245_VOLTAGE(in5_input, LTC4245_12VOUT); | |
298 | LTC4245_VOLTAGE(in6_input, LTC4245_5VOUT); | |
299 | LTC4245_VOLTAGE(in7_input, LTC4245_3VOUT); | |
300 | LTC4245_VOLTAGE(in8_input, LTC4245_VEEOUT); | |
301 | ||
302 | /* Power Bad alarms */ | |
303 | LTC4245_ALARM(in5_min_alarm, (1 << 0), LTC4245_FAULT2); | |
304 | LTC4245_ALARM(in6_min_alarm, (1 << 1), LTC4245_FAULT2); | |
305 | LTC4245_ALARM(in7_min_alarm, (1 << 2), LTC4245_FAULT2); | |
306 | LTC4245_ALARM(in8_min_alarm, (1 << 3), LTC4245_FAULT2); | |
307 | ||
308 | /* GPIO voltages */ | |
309 | LTC4245_VOLTAGE(in9_input, LTC4245_GPIOADC1); | |
310 | LTC4245_VOLTAGE(in10_input, LTC4245_GPIOADC2); | |
311 | LTC4245_VOLTAGE(in11_input, LTC4245_GPIOADC3); | |
312 | ||
313 | /* Power Consumption (virtual) */ | |
314 | LTC4245_POWER(power1_input, LTC4245_12VSENSE); | |
315 | LTC4245_POWER(power2_input, LTC4245_5VSENSE); | |
316 | LTC4245_POWER(power3_input, LTC4245_3VSENSE); | |
317 | LTC4245_POWER(power4_input, LTC4245_VEESENSE); | |
318 | ||
319 | /* Finally, construct an array of pointers to members of the above objects, | |
320 | * as required for sysfs_create_group() | |
321 | */ | |
322 | static struct attribute *ltc4245_attributes[] = { | |
323 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
324 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
325 | &sensor_dev_attr_in3_input.dev_attr.attr, | |
326 | &sensor_dev_attr_in4_input.dev_attr.attr, | |
327 | ||
328 | &sensor_dev_attr_in1_min_alarm.dev_attr.attr, | |
329 | &sensor_dev_attr_in2_min_alarm.dev_attr.attr, | |
330 | &sensor_dev_attr_in3_min_alarm.dev_attr.attr, | |
331 | &sensor_dev_attr_in4_min_alarm.dev_attr.attr, | |
332 | ||
333 | &sensor_dev_attr_curr1_input.dev_attr.attr, | |
334 | &sensor_dev_attr_curr2_input.dev_attr.attr, | |
335 | &sensor_dev_attr_curr3_input.dev_attr.attr, | |
336 | &sensor_dev_attr_curr4_input.dev_attr.attr, | |
337 | ||
338 | &sensor_dev_attr_curr1_max_alarm.dev_attr.attr, | |
339 | &sensor_dev_attr_curr2_max_alarm.dev_attr.attr, | |
340 | &sensor_dev_attr_curr3_max_alarm.dev_attr.attr, | |
341 | &sensor_dev_attr_curr4_max_alarm.dev_attr.attr, | |
342 | ||
343 | &sensor_dev_attr_in5_input.dev_attr.attr, | |
344 | &sensor_dev_attr_in6_input.dev_attr.attr, | |
345 | &sensor_dev_attr_in7_input.dev_attr.attr, | |
346 | &sensor_dev_attr_in8_input.dev_attr.attr, | |
347 | ||
348 | &sensor_dev_attr_in5_min_alarm.dev_attr.attr, | |
349 | &sensor_dev_attr_in6_min_alarm.dev_attr.attr, | |
350 | &sensor_dev_attr_in7_min_alarm.dev_attr.attr, | |
351 | &sensor_dev_attr_in8_min_alarm.dev_attr.attr, | |
352 | ||
353 | &sensor_dev_attr_in9_input.dev_attr.attr, | |
354 | &sensor_dev_attr_in10_input.dev_attr.attr, | |
355 | &sensor_dev_attr_in11_input.dev_attr.attr, | |
356 | ||
357 | &sensor_dev_attr_power1_input.dev_attr.attr, | |
358 | &sensor_dev_attr_power2_input.dev_attr.attr, | |
359 | &sensor_dev_attr_power3_input.dev_attr.attr, | |
360 | &sensor_dev_attr_power4_input.dev_attr.attr, | |
361 | ||
362 | NULL, | |
363 | }; | |
364 | ||
365 | static const struct attribute_group ltc4245_group = { | |
366 | .attrs = ltc4245_attributes, | |
367 | }; | |
368 | ||
369 | static int ltc4245_probe(struct i2c_client *client, | |
370 | const struct i2c_device_id *id) | |
371 | { | |
372 | struct ltc4245_data *data; | |
373 | int ret; | |
374 | ||
375 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
376 | if (!data) { | |
377 | ret = -ENOMEM; | |
378 | goto out_kzalloc; | |
379 | } | |
380 | ||
381 | i2c_set_clientdata(client, data); | |
382 | mutex_init(&data->update_lock); | |
383 | ||
384 | /* Initialize the LTC4245 chip */ | |
385 | /* TODO */ | |
386 | ||
387 | /* Register sysfs hooks */ | |
388 | ret = sysfs_create_group(&client->dev.kobj, <c4245_group); | |
389 | if (ret) | |
390 | goto out_sysfs_create_group; | |
391 | ||
392 | data->hwmon_dev = hwmon_device_register(&client->dev); | |
393 | if (IS_ERR(data->hwmon_dev)) { | |
394 | ret = PTR_ERR(data->hwmon_dev); | |
395 | goto out_hwmon_device_register; | |
396 | } | |
397 | ||
398 | return 0; | |
399 | ||
400 | out_hwmon_device_register: | |
401 | sysfs_remove_group(&client->dev.kobj, <c4245_group); | |
402 | out_sysfs_create_group: | |
403 | kfree(data); | |
404 | out_kzalloc: | |
405 | return ret; | |
406 | } | |
407 | ||
408 | static int ltc4245_remove(struct i2c_client *client) | |
409 | { | |
410 | struct ltc4245_data *data = i2c_get_clientdata(client); | |
411 | ||
412 | hwmon_device_unregister(data->hwmon_dev); | |
413 | sysfs_remove_group(&client->dev.kobj, <c4245_group); | |
414 | ||
415 | kfree(data); | |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
420 | /* Check that some bits in a control register appear at all possible | |
421 | * locations without changing value | |
422 | * | |
423 | * @client: the i2c client to use | |
424 | * @reg: the register to read | |
425 | * @bits: the bits to check (0xff checks all bits, | |
426 | * 0x03 checks only the last two bits) | |
427 | * | |
428 | * return -ERRNO if the register read failed | |
429 | * return -ENODEV if the register value doesn't stay constant at all | |
430 | * possible addresses | |
431 | * | |
432 | * return 0 for success | |
433 | */ | |
434 | static int ltc4245_check_control_reg(struct i2c_client *client, u8 reg, u8 bits) | |
435 | { | |
436 | int i; | |
437 | s32 v, voff1, voff2; | |
438 | ||
439 | /* Read register and check for error */ | |
440 | v = i2c_smbus_read_byte_data(client, reg); | |
441 | if (v < 0) | |
442 | return v; | |
443 | ||
444 | v &= bits; | |
445 | ||
446 | for (i = 0x00; i < 0xff; i += 0x20) { | |
447 | ||
448 | voff1 = i2c_smbus_read_byte_data(client, reg + i); | |
449 | if (voff1 < 0) | |
450 | return voff1; | |
451 | ||
452 | voff2 = i2c_smbus_read_byte_data(client, reg + i + 0x08); | |
453 | if (voff2 < 0) | |
454 | return voff2; | |
455 | ||
456 | voff1 &= bits; | |
457 | voff2 &= bits; | |
458 | ||
459 | if (v != voff1 || v != voff2) | |
460 | return -ENODEV; | |
461 | } | |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
466 | static int ltc4245_detect(struct i2c_client *client, | |
467 | int kind, | |
468 | struct i2c_board_info *info) | |
469 | { | |
470 | struct i2c_adapter *adapter = client->adapter; | |
471 | ||
472 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
473 | return -ENODEV; | |
474 | ||
475 | if (kind < 0) { /* probed detection - check the chip type */ | |
476 | s32 v; /* 8 bits from the chip, or -ERRNO */ | |
477 | ||
478 | /* Chip registers 0x00-0x07 are control registers | |
479 | * Chip registers 0x10-0x1f are data registers | |
480 | * | |
481 | * Address bits b7-b5 are ignored. This makes the chip "repeat" | |
482 | * in steps of 0x20. Any control registers should appear with | |
483 | * the same values across all duplicated addresses. | |
484 | * | |
485 | * Register 0x02 bit b2 is reserved, expect 0 | |
486 | * Register 0x07 bits b7 to b4 are reserved, expect 0 | |
487 | * | |
488 | * Registers 0x01, 0x02 are control registers and should not | |
489 | * change on their own. | |
490 | * | |
491 | * Register 0x06 bits b6 and b7 are control bits, and should | |
492 | * not change on their own. | |
493 | * | |
494 | * Register 0x07 bits b3 to b0 are control bits, and should | |
495 | * not change on their own. | |
496 | */ | |
497 | ||
498 | /* read register 0x02 reserved bit, expect 0 */ | |
499 | v = i2c_smbus_read_byte_data(client, LTC4245_CONTROL); | |
500 | if (v < 0 || (v & 0x04) != 0) | |
501 | return -ENODEV; | |
502 | ||
503 | /* read register 0x07 reserved bits, expect 0 */ | |
504 | v = i2c_smbus_read_byte_data(client, LTC4245_ADCADR); | |
505 | if (v < 0 || (v & 0xf0) != 0) | |
506 | return -ENODEV; | |
507 | ||
508 | /* check that the alert register appears at all locations */ | |
509 | if (ltc4245_check_control_reg(client, LTC4245_ALERT, 0xff)) | |
510 | return -ENODEV; | |
511 | ||
512 | /* check that the control register appears at all locations */ | |
513 | if (ltc4245_check_control_reg(client, LTC4245_CONTROL, 0xff)) | |
514 | return -ENODEV; | |
515 | ||
516 | /* check that register 0x06 bits b6 and b7 stay constant */ | |
517 | if (ltc4245_check_control_reg(client, LTC4245_GPIO, 0xc0)) | |
518 | return -ENODEV; | |
519 | ||
520 | /* check that register 0x07 bits b3-b0 stay constant */ | |
521 | if (ltc4245_check_control_reg(client, LTC4245_ADCADR, 0x0f)) | |
522 | return -ENODEV; | |
523 | } | |
524 | ||
525 | strlcpy(info->type, "ltc4245", I2C_NAME_SIZE); | |
526 | dev_info(&adapter->dev, "ltc4245 %s at address 0x%02x\n", | |
527 | kind < 0 ? "probed" : "forced", | |
528 | client->addr); | |
529 | ||
530 | return 0; | |
531 | } | |
532 | ||
533 | static const struct i2c_device_id ltc4245_id[] = { | |
534 | { "ltc4245", ltc4245 }, | |
535 | { } | |
536 | }; | |
537 | MODULE_DEVICE_TABLE(i2c, ltc4245_id); | |
538 | ||
539 | /* This is the driver that will be inserted */ | |
540 | static struct i2c_driver ltc4245_driver = { | |
541 | .class = I2C_CLASS_HWMON, | |
542 | .driver = { | |
543 | .name = "ltc4245", | |
544 | }, | |
545 | .probe = ltc4245_probe, | |
546 | .remove = ltc4245_remove, | |
547 | .id_table = ltc4245_id, | |
548 | .detect = ltc4245_detect, | |
549 | .address_data = &addr_data, | |
550 | }; | |
551 | ||
552 | static int __init ltc4245_init(void) | |
553 | { | |
554 | return i2c_add_driver(<c4245_driver); | |
555 | } | |
556 | ||
557 | static void __exit ltc4245_exit(void) | |
558 | { | |
559 | i2c_del_driver(<c4245_driver); | |
560 | } | |
561 | ||
562 | MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>"); | |
563 | MODULE_DESCRIPTION("LTC4245 driver"); | |
564 | MODULE_LICENSE("GPL"); | |
565 | ||
566 | module_init(ltc4245_init); | |
567 | module_exit(ltc4245_exit); |