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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> | |
dcd8f392 | 24 | #include <linux/jiffies.h> |
5950ec8d | 25 | #include <linux/i2c/ltc4245.h> |
6e34b187 | 26 | |
6e34b187 IS |
27 | /* Here are names of the chip's registers (a.k.a. commands) */ |
28 | enum ltc4245_cmd { | |
29 | LTC4245_STATUS = 0x00, /* readonly */ | |
30 | LTC4245_ALERT = 0x01, | |
31 | LTC4245_CONTROL = 0x02, | |
32 | LTC4245_ON = 0x03, | |
33 | LTC4245_FAULT1 = 0x04, | |
34 | LTC4245_FAULT2 = 0x05, | |
35 | LTC4245_GPIO = 0x06, | |
36 | LTC4245_ADCADR = 0x07, | |
37 | ||
38 | LTC4245_12VIN = 0x10, | |
39 | LTC4245_12VSENSE = 0x11, | |
40 | LTC4245_12VOUT = 0x12, | |
41 | LTC4245_5VIN = 0x13, | |
42 | LTC4245_5VSENSE = 0x14, | |
43 | LTC4245_5VOUT = 0x15, | |
44 | LTC4245_3VIN = 0x16, | |
45 | LTC4245_3VSENSE = 0x17, | |
46 | LTC4245_3VOUT = 0x18, | |
47 | LTC4245_VEEIN = 0x19, | |
48 | LTC4245_VEESENSE = 0x1a, | |
49 | LTC4245_VEEOUT = 0x1b, | |
df16dd53 | 50 | LTC4245_GPIOADC = 0x1c, |
6e34b187 IS |
51 | }; |
52 | ||
53 | struct ltc4245_data { | |
9a85d53c GR |
54 | struct i2c_client *client; |
55 | ||
56 | const struct attribute_group *groups[3]; | |
6e34b187 IS |
57 | |
58 | struct mutex update_lock; | |
59 | bool valid; | |
60 | unsigned long last_updated; /* in jiffies */ | |
61 | ||
62 | /* Control registers */ | |
63 | u8 cregs[0x08]; | |
64 | ||
65 | /* Voltage registers */ | |
df16dd53 | 66 | u8 vregs[0x0d]; |
5950ec8d IS |
67 | |
68 | /* GPIO ADC registers */ | |
69 | bool use_extra_gpios; | |
70 | int gpios[3]; | |
6e34b187 IS |
71 | }; |
72 | ||
5950ec8d IS |
73 | /* |
74 | * Update the readings from the GPIO pins. If the driver has been configured to | |
75 | * sample all GPIO's as analog voltages, a round-robin sampling method is used. | |
76 | * Otherwise, only the configured GPIO pin is sampled. | |
77 | * | |
78 | * LOCKING: must hold data->update_lock | |
79 | */ | |
80 | static void ltc4245_update_gpios(struct device *dev) | |
81 | { | |
9a85d53c GR |
82 | struct ltc4245_data *data = dev_get_drvdata(dev); |
83 | struct i2c_client *client = data->client; | |
5950ec8d IS |
84 | u8 gpio_curr, gpio_next, gpio_reg; |
85 | int i; | |
86 | ||
87 | /* no extra gpio support, we're basically done */ | |
88 | if (!data->use_extra_gpios) { | |
89 | data->gpios[0] = data->vregs[LTC4245_GPIOADC - 0x10]; | |
90 | return; | |
91 | } | |
92 | ||
93 | /* | |
94 | * If the last reading was too long ago, then we mark all old GPIO | |
95 | * readings as stale by setting them to -EAGAIN | |
96 | */ | |
97 | if (time_after(jiffies, data->last_updated + 5 * HZ)) { | |
5950ec8d IS |
98 | for (i = 0; i < ARRAY_SIZE(data->gpios); i++) |
99 | data->gpios[i] = -EAGAIN; | |
100 | } | |
101 | ||
102 | /* | |
103 | * Get the current GPIO pin | |
104 | * | |
105 | * The datasheet calls these GPIO[1-3], but we'll calculate the zero | |
106 | * based array index instead, and call them GPIO[0-2]. This is much | |
107 | * easier to think about. | |
108 | */ | |
109 | gpio_curr = (data->cregs[LTC4245_GPIO] & 0xc0) >> 6; | |
110 | if (gpio_curr > 0) | |
111 | gpio_curr -= 1; | |
112 | ||
113 | /* Read the GPIO voltage from the GPIOADC register */ | |
114 | data->gpios[gpio_curr] = data->vregs[LTC4245_GPIOADC - 0x10]; | |
115 | ||
116 | /* Find the next GPIO pin to read */ | |
117 | gpio_next = (gpio_curr + 1) % ARRAY_SIZE(data->gpios); | |
118 | ||
119 | /* | |
120 | * Calculate the correct setting for the GPIO register so it will | |
121 | * sample the next GPIO pin | |
122 | */ | |
123 | gpio_reg = (data->cregs[LTC4245_GPIO] & 0x3f) | ((gpio_next + 1) << 6); | |
124 | ||
125 | /* Update the GPIO register */ | |
126 | i2c_smbus_write_byte_data(client, LTC4245_GPIO, gpio_reg); | |
127 | ||
128 | /* Update saved data */ | |
129 | data->cregs[LTC4245_GPIO] = gpio_reg; | |
130 | } | |
131 | ||
6e34b187 IS |
132 | static struct ltc4245_data *ltc4245_update_device(struct device *dev) |
133 | { | |
9a85d53c GR |
134 | struct ltc4245_data *data = dev_get_drvdata(dev); |
135 | struct i2c_client *client = data->client; | |
6e34b187 IS |
136 | s32 val; |
137 | int i; | |
138 | ||
139 | mutex_lock(&data->update_lock); | |
140 | ||
141 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
142 | ||
6e34b187 IS |
143 | /* Read control registers -- 0x00 to 0x07 */ |
144 | for (i = 0; i < ARRAY_SIZE(data->cregs); i++) { | |
145 | val = i2c_smbus_read_byte_data(client, i); | |
146 | if (unlikely(val < 0)) | |
147 | data->cregs[i] = 0; | |
148 | else | |
149 | data->cregs[i] = val; | |
150 | } | |
151 | ||
df16dd53 | 152 | /* Read voltage registers -- 0x10 to 0x1c */ |
6e34b187 IS |
153 | for (i = 0; i < ARRAY_SIZE(data->vregs); i++) { |
154 | val = i2c_smbus_read_byte_data(client, i+0x10); | |
155 | if (unlikely(val < 0)) | |
156 | data->vregs[i] = 0; | |
157 | else | |
158 | data->vregs[i] = val; | |
159 | } | |
160 | ||
5950ec8d IS |
161 | /* Update GPIO readings */ |
162 | ltc4245_update_gpios(dev); | |
163 | ||
6e34b187 IS |
164 | data->last_updated = jiffies; |
165 | data->valid = 1; | |
166 | } | |
167 | ||
168 | mutex_unlock(&data->update_lock); | |
169 | ||
170 | return data; | |
171 | } | |
172 | ||
173 | /* Return the voltage from the given register in millivolts */ | |
174 | static int ltc4245_get_voltage(struct device *dev, u8 reg) | |
175 | { | |
176 | struct ltc4245_data *data = ltc4245_update_device(dev); | |
177 | const u8 regval = data->vregs[reg - 0x10]; | |
178 | u32 voltage = 0; | |
179 | ||
180 | switch (reg) { | |
181 | case LTC4245_12VIN: | |
182 | case LTC4245_12VOUT: | |
183 | voltage = regval * 55; | |
184 | break; | |
185 | case LTC4245_5VIN: | |
186 | case LTC4245_5VOUT: | |
187 | voltage = regval * 22; | |
188 | break; | |
189 | case LTC4245_3VIN: | |
190 | case LTC4245_3VOUT: | |
191 | voltage = regval * 15; | |
192 | break; | |
193 | case LTC4245_VEEIN: | |
194 | case LTC4245_VEEOUT: | |
195 | voltage = regval * -55; | |
196 | break; | |
df16dd53 | 197 | case LTC4245_GPIOADC: |
6e34b187 IS |
198 | voltage = regval * 10; |
199 | break; | |
200 | default: | |
201 | /* If we get here, the developer messed up */ | |
202 | WARN_ON_ONCE(1); | |
203 | break; | |
204 | } | |
205 | ||
206 | return voltage; | |
207 | } | |
208 | ||
209 | /* Return the current in the given sense register in milliAmperes */ | |
210 | static unsigned int ltc4245_get_current(struct device *dev, u8 reg) | |
211 | { | |
212 | struct ltc4245_data *data = ltc4245_update_device(dev); | |
213 | const u8 regval = data->vregs[reg - 0x10]; | |
214 | unsigned int voltage; | |
215 | unsigned int curr; | |
216 | ||
430b4fcd GR |
217 | /* |
218 | * The strange looking conversions that follow are fixed-point | |
6e34b187 IS |
219 | * math, since we cannot do floating point in the kernel. |
220 | * | |
221 | * Step 1: convert sense register to microVolts | |
222 | * Step 2: convert voltage to milliAmperes | |
223 | * | |
224 | * If you play around with the V=IR equation, you come up with | |
225 | * the following: X uV / Y mOhm == Z mA | |
226 | * | |
227 | * With the resistors that are fractions of a milliOhm, we multiply | |
228 | * the voltage and resistance by 10, to shift the decimal point. | |
229 | * Now we can use the normal division operator again. | |
230 | */ | |
231 | ||
232 | switch (reg) { | |
233 | case LTC4245_12VSENSE: | |
234 | voltage = regval * 250; /* voltage in uV */ | |
235 | curr = voltage / 50; /* sense resistor 50 mOhm */ | |
236 | break; | |
237 | case LTC4245_5VSENSE: | |
238 | voltage = regval * 125; /* voltage in uV */ | |
239 | curr = (voltage * 10) / 35; /* sense resistor 3.5 mOhm */ | |
240 | break; | |
241 | case LTC4245_3VSENSE: | |
242 | voltage = regval * 125; /* voltage in uV */ | |
243 | curr = (voltage * 10) / 25; /* sense resistor 2.5 mOhm */ | |
244 | break; | |
245 | case LTC4245_VEESENSE: | |
246 | voltage = regval * 250; /* voltage in uV */ | |
247 | curr = voltage / 100; /* sense resistor 100 mOhm */ | |
248 | break; | |
249 | default: | |
250 | /* If we get here, the developer messed up */ | |
251 | WARN_ON_ONCE(1); | |
252 | curr = 0; | |
253 | break; | |
254 | } | |
255 | ||
256 | return curr; | |
257 | } | |
258 | ||
259 | static ssize_t ltc4245_show_voltage(struct device *dev, | |
260 | struct device_attribute *da, | |
261 | char *buf) | |
262 | { | |
263 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
264 | const int voltage = ltc4245_get_voltage(dev, attr->index); | |
265 | ||
266 | return snprintf(buf, PAGE_SIZE, "%d\n", voltage); | |
267 | } | |
268 | ||
269 | static ssize_t ltc4245_show_current(struct device *dev, | |
270 | struct device_attribute *da, | |
271 | char *buf) | |
272 | { | |
273 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
274 | const unsigned int curr = ltc4245_get_current(dev, attr->index); | |
275 | ||
276 | return snprintf(buf, PAGE_SIZE, "%u\n", curr); | |
277 | } | |
278 | ||
279 | static ssize_t ltc4245_show_power(struct device *dev, | |
280 | struct device_attribute *da, | |
281 | char *buf) | |
282 | { | |
283 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
284 | const unsigned int curr = ltc4245_get_current(dev, attr->index); | |
285 | const int output_voltage = ltc4245_get_voltage(dev, attr->index+1); | |
286 | ||
287 | /* current in mA * voltage in mV == power in uW */ | |
288 | const unsigned int power = abs(output_voltage * curr); | |
289 | ||
290 | return snprintf(buf, PAGE_SIZE, "%u\n", power); | |
291 | } | |
292 | ||
293 | static ssize_t ltc4245_show_alarm(struct device *dev, | |
294 | struct device_attribute *da, | |
295 | char *buf) | |
296 | { | |
297 | struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da); | |
298 | struct ltc4245_data *data = ltc4245_update_device(dev); | |
299 | const u8 reg = data->cregs[attr->index]; | |
300 | const u32 mask = attr->nr; | |
301 | ||
302 | return snprintf(buf, PAGE_SIZE, "%u\n", (reg & mask) ? 1 : 0); | |
303 | } | |
304 | ||
5950ec8d IS |
305 | static ssize_t ltc4245_show_gpio(struct device *dev, |
306 | struct device_attribute *da, | |
307 | char *buf) | |
308 | { | |
309 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
310 | struct ltc4245_data *data = ltc4245_update_device(dev); | |
311 | int val = data->gpios[attr->index]; | |
312 | ||
313 | /* handle stale GPIO's */ | |
314 | if (val < 0) | |
315 | return val; | |
316 | ||
317 | /* Convert to millivolts and print */ | |
318 | return snprintf(buf, PAGE_SIZE, "%u\n", val * 10); | |
319 | } | |
320 | ||
6e34b187 IS |
321 | /* Construct a sensor_device_attribute structure for each register */ |
322 | ||
323 | /* Input voltages */ | |
f539038e GR |
324 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ltc4245_show_voltage, NULL, |
325 | LTC4245_12VIN); | |
326 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, ltc4245_show_voltage, NULL, | |
327 | LTC4245_5VIN); | |
328 | static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, ltc4245_show_voltage, NULL, | |
329 | LTC4245_3VIN); | |
330 | static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, ltc4245_show_voltage, NULL, | |
331 | LTC4245_VEEIN); | |
6e34b187 IS |
332 | |
333 | /* Input undervoltage alarms */ | |
f539038e GR |
334 | static SENSOR_DEVICE_ATTR_2(in1_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL, |
335 | 1 << 0, LTC4245_FAULT1); | |
336 | static SENSOR_DEVICE_ATTR_2(in2_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL, | |
337 | 1 << 1, LTC4245_FAULT1); | |
338 | static SENSOR_DEVICE_ATTR_2(in3_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL, | |
339 | 1 << 2, LTC4245_FAULT1); | |
340 | static SENSOR_DEVICE_ATTR_2(in4_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL, | |
341 | 1 << 3, LTC4245_FAULT1); | |
6e34b187 IS |
342 | |
343 | /* Currents (via sense resistor) */ | |
f539038e GR |
344 | static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ltc4245_show_current, NULL, |
345 | LTC4245_12VSENSE); | |
346 | static SENSOR_DEVICE_ATTR(curr2_input, S_IRUGO, ltc4245_show_current, NULL, | |
347 | LTC4245_5VSENSE); | |
348 | static SENSOR_DEVICE_ATTR(curr3_input, S_IRUGO, ltc4245_show_current, NULL, | |
349 | LTC4245_3VSENSE); | |
350 | static SENSOR_DEVICE_ATTR(curr4_input, S_IRUGO, ltc4245_show_current, NULL, | |
351 | LTC4245_VEESENSE); | |
6e34b187 IS |
352 | |
353 | /* Overcurrent alarms */ | |
f539038e GR |
354 | static SENSOR_DEVICE_ATTR_2(curr1_max_alarm, S_IRUGO, ltc4245_show_alarm, NULL, |
355 | 1 << 4, LTC4245_FAULT1); | |
356 | static SENSOR_DEVICE_ATTR_2(curr2_max_alarm, S_IRUGO, ltc4245_show_alarm, NULL, | |
357 | 1 << 5, LTC4245_FAULT1); | |
358 | static SENSOR_DEVICE_ATTR_2(curr3_max_alarm, S_IRUGO, ltc4245_show_alarm, NULL, | |
359 | 1 << 6, LTC4245_FAULT1); | |
360 | static SENSOR_DEVICE_ATTR_2(curr4_max_alarm, S_IRUGO, ltc4245_show_alarm, NULL, | |
361 | 1 << 7, LTC4245_FAULT1); | |
6e34b187 IS |
362 | |
363 | /* Output voltages */ | |
f539038e GR |
364 | static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, ltc4245_show_voltage, NULL, |
365 | LTC4245_12VOUT); | |
366 | static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, ltc4245_show_voltage, NULL, | |
367 | LTC4245_5VOUT); | |
368 | static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, ltc4245_show_voltage, NULL, | |
369 | LTC4245_3VOUT); | |
370 | static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, ltc4245_show_voltage, NULL, | |
371 | LTC4245_VEEOUT); | |
6e34b187 IS |
372 | |
373 | /* Power Bad alarms */ | |
f539038e GR |
374 | static SENSOR_DEVICE_ATTR_2(in5_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL, |
375 | 1 << 0, LTC4245_FAULT2); | |
376 | static SENSOR_DEVICE_ATTR_2(in6_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL, | |
377 | 1 << 1, LTC4245_FAULT2); | |
378 | static SENSOR_DEVICE_ATTR_2(in7_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL, | |
379 | 1 << 2, LTC4245_FAULT2); | |
380 | static SENSOR_DEVICE_ATTR_2(in8_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL, | |
381 | 1 << 3, LTC4245_FAULT2); | |
6e34b187 IS |
382 | |
383 | /* GPIO voltages */ | |
f539038e GR |
384 | static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, ltc4245_show_gpio, NULL, 0); |
385 | static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, ltc4245_show_gpio, NULL, 1); | |
386 | static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, ltc4245_show_gpio, NULL, 2); | |
6e34b187 IS |
387 | |
388 | /* Power Consumption (virtual) */ | |
f539038e GR |
389 | static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ltc4245_show_power, NULL, |
390 | LTC4245_12VSENSE); | |
391 | static SENSOR_DEVICE_ATTR(power2_input, S_IRUGO, ltc4245_show_power, NULL, | |
392 | LTC4245_5VSENSE); | |
393 | static SENSOR_DEVICE_ATTR(power3_input, S_IRUGO, ltc4245_show_power, NULL, | |
394 | LTC4245_3VSENSE); | |
395 | static SENSOR_DEVICE_ATTR(power4_input, S_IRUGO, ltc4245_show_power, NULL, | |
396 | LTC4245_VEESENSE); | |
6e34b187 | 397 | |
430b4fcd GR |
398 | /* |
399 | * Finally, construct an array of pointers to members of the above objects, | |
6e34b187 IS |
400 | * as required for sysfs_create_group() |
401 | */ | |
5950ec8d | 402 | static struct attribute *ltc4245_std_attributes[] = { |
6e34b187 IS |
403 | &sensor_dev_attr_in1_input.dev_attr.attr, |
404 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
405 | &sensor_dev_attr_in3_input.dev_attr.attr, | |
406 | &sensor_dev_attr_in4_input.dev_attr.attr, | |
407 | ||
408 | &sensor_dev_attr_in1_min_alarm.dev_attr.attr, | |
409 | &sensor_dev_attr_in2_min_alarm.dev_attr.attr, | |
410 | &sensor_dev_attr_in3_min_alarm.dev_attr.attr, | |
411 | &sensor_dev_attr_in4_min_alarm.dev_attr.attr, | |
412 | ||
413 | &sensor_dev_attr_curr1_input.dev_attr.attr, | |
414 | &sensor_dev_attr_curr2_input.dev_attr.attr, | |
415 | &sensor_dev_attr_curr3_input.dev_attr.attr, | |
416 | &sensor_dev_attr_curr4_input.dev_attr.attr, | |
417 | ||
418 | &sensor_dev_attr_curr1_max_alarm.dev_attr.attr, | |
419 | &sensor_dev_attr_curr2_max_alarm.dev_attr.attr, | |
420 | &sensor_dev_attr_curr3_max_alarm.dev_attr.attr, | |
421 | &sensor_dev_attr_curr4_max_alarm.dev_attr.attr, | |
422 | ||
423 | &sensor_dev_attr_in5_input.dev_attr.attr, | |
424 | &sensor_dev_attr_in6_input.dev_attr.attr, | |
425 | &sensor_dev_attr_in7_input.dev_attr.attr, | |
426 | &sensor_dev_attr_in8_input.dev_attr.attr, | |
427 | ||
428 | &sensor_dev_attr_in5_min_alarm.dev_attr.attr, | |
429 | &sensor_dev_attr_in6_min_alarm.dev_attr.attr, | |
430 | &sensor_dev_attr_in7_min_alarm.dev_attr.attr, | |
431 | &sensor_dev_attr_in8_min_alarm.dev_attr.attr, | |
432 | ||
433 | &sensor_dev_attr_in9_input.dev_attr.attr, | |
6e34b187 IS |
434 | |
435 | &sensor_dev_attr_power1_input.dev_attr.attr, | |
436 | &sensor_dev_attr_power2_input.dev_attr.attr, | |
437 | &sensor_dev_attr_power3_input.dev_attr.attr, | |
438 | &sensor_dev_attr_power4_input.dev_attr.attr, | |
439 | ||
440 | NULL, | |
441 | }; | |
442 | ||
5950ec8d IS |
443 | static struct attribute *ltc4245_gpio_attributes[] = { |
444 | &sensor_dev_attr_in10_input.dev_attr.attr, | |
445 | &sensor_dev_attr_in11_input.dev_attr.attr, | |
446 | NULL, | |
447 | }; | |
448 | ||
449 | static const struct attribute_group ltc4245_std_group = { | |
450 | .attrs = ltc4245_std_attributes, | |
451 | }; | |
452 | ||
453 | static const struct attribute_group ltc4245_gpio_group = { | |
454 | .attrs = ltc4245_gpio_attributes, | |
6e34b187 IS |
455 | }; |
456 | ||
9a85d53c | 457 | static void ltc4245_sysfs_add_groups(struct ltc4245_data *data) |
5950ec8d | 458 | { |
9a85d53c GR |
459 | /* standard sysfs attributes */ |
460 | data->groups[0] = <c4245_std_group; | |
5950ec8d IS |
461 | |
462 | /* if we're using the extra gpio support, register it's attributes */ | |
5950ec8d | 463 | if (data->use_extra_gpios) |
9a85d53c | 464 | data->groups[1] = <c4245_gpio_group; |
5950ec8d IS |
465 | } |
466 | ||
467 | static bool ltc4245_use_extra_gpios(struct i2c_client *client) | |
468 | { | |
469 | struct ltc4245_platform_data *pdata = dev_get_platdata(&client->dev); | |
5950ec8d | 470 | struct device_node *np = client->dev.of_node; |
5950ec8d IS |
471 | |
472 | /* prefer platform data */ | |
473 | if (pdata) | |
474 | return pdata->use_extra_gpios; | |
475 | ||
5950ec8d IS |
476 | /* fallback on OF */ |
477 | if (of_find_property(np, "ltc4245,use-extra-gpios", NULL)) | |
478 | return true; | |
5950ec8d IS |
479 | |
480 | return false; | |
481 | } | |
482 | ||
6e34b187 IS |
483 | static int ltc4245_probe(struct i2c_client *client, |
484 | const struct i2c_device_id *id) | |
485 | { | |
2d2a7cff | 486 | struct i2c_adapter *adapter = client->adapter; |
6e34b187 | 487 | struct ltc4245_data *data; |
9a85d53c | 488 | struct device *hwmon_dev; |
6e34b187 | 489 | |
2d2a7cff JD |
490 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
491 | return -ENODEV; | |
492 | ||
effb8ab1 GR |
493 | data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); |
494 | if (!data) | |
495 | return -ENOMEM; | |
6e34b187 | 496 | |
9a85d53c | 497 | data->client = client; |
6e34b187 | 498 | mutex_init(&data->update_lock); |
5950ec8d | 499 | data->use_extra_gpios = ltc4245_use_extra_gpios(client); |
6e34b187 IS |
500 | |
501 | /* Initialize the LTC4245 chip */ | |
58f055e5 IS |
502 | i2c_smbus_write_byte_data(client, LTC4245_FAULT1, 0x00); |
503 | i2c_smbus_write_byte_data(client, LTC4245_FAULT2, 0x00); | |
6e34b187 | 504 | |
9a85d53c GR |
505 | /* Add sysfs hooks */ |
506 | ltc4245_sysfs_add_groups(data); | |
6e34b187 | 507 | |
94c42cf9 GR |
508 | hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev, |
509 | client->name, data, | |
510 | data->groups); | |
511 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
6e34b187 IS |
512 | } |
513 | ||
6e34b187 | 514 | static const struct i2c_device_id ltc4245_id[] = { |
2d2a7cff | 515 | { "ltc4245", 0 }, |
6e34b187 IS |
516 | { } |
517 | }; | |
518 | MODULE_DEVICE_TABLE(i2c, ltc4245_id); | |
519 | ||
520 | /* This is the driver that will be inserted */ | |
521 | static struct i2c_driver ltc4245_driver = { | |
6e34b187 IS |
522 | .driver = { |
523 | .name = "ltc4245", | |
524 | }, | |
525 | .probe = ltc4245_probe, | |
6e34b187 | 526 | .id_table = ltc4245_id, |
6e34b187 IS |
527 | }; |
528 | ||
f0967eea | 529 | module_i2c_driver(ltc4245_driver); |
6e34b187 IS |
530 | |
531 | MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>"); | |
532 | MODULE_DESCRIPTION("LTC4245 driver"); | |
533 | MODULE_LICENSE("GPL"); |