blob: b5d598c3aa71b356f40fb9a5f89738eed16c5350 [file] [log] [blame]
Keerthyf99c1d42011-03-01 19:12:26 +05301/*
2 *
3 * TWL4030 MADC module driver-This driver monitors the real time
4 * conversion of analog signals like battery temperature,
5 * battery type, battery level etc.
6 *
7 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
8 * J Keerthy <j-keerthy@ti.com>
9 *
10 * Based on twl4030-madc.c
11 * Copyright (C) 2008 Nokia Corporation
12 * Mikko Ylinen <mikko.k.ylinen@nokia.com>
13 *
14 * Amit Kucheria <amit.kucheria@canonical.com>
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * version 2 as published by the Free Software Foundation.
19 *
20 * This program is distributed in the hope that it will be useful, but
21 * WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 * General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
28 * 02110-1301 USA
29 *
30 */
31
32#include <linux/init.h>
33#include <linux/device.h>
34#include <linux/interrupt.h>
35#include <linux/kernel.h>
36#include <linux/delay.h>
37#include <linux/platform_device.h>
38#include <linux/slab.h>
39#include <linux/i2c/twl.h>
40#include <linux/i2c/twl4030-madc.h>
41#include <linux/module.h>
42#include <linux/stddef.h>
43#include <linux/mutex.h>
44#include <linux/bitops.h>
45#include <linux/jiffies.h>
46#include <linux/types.h>
47#include <linux/gfp.h>
48#include <linux/err.h>
49
50/*
51 * struct twl4030_madc_data - a container for madc info
52 * @dev - pointer to device structure for madc
53 * @lock - mutex protecting this data structure
54 * @requests - Array of request struct corresponding to SW1, SW2 and RT
55 * @imr - Interrupt mask register of MADC
56 * @isr - Interrupt status register of MADC
57 */
58struct twl4030_madc_data {
59 struct device *dev;
60 struct mutex lock; /* mutex protecting this data structure */
61 struct twl4030_madc_request requests[TWL4030_MADC_NUM_METHODS];
62 int imr;
63 int isr;
64};
65
66static struct twl4030_madc_data *twl4030_madc;
67
68struct twl4030_prescale_divider_ratios {
69 s16 numerator;
70 s16 denominator;
71};
72
73static const struct twl4030_prescale_divider_ratios
74twl4030_divider_ratios[16] = {
75 {1, 1}, /* CHANNEL 0 No Prescaler */
76 {1, 1}, /* CHANNEL 1 No Prescaler */
77 {6, 10}, /* CHANNEL 2 */
78 {6, 10}, /* CHANNEL 3 */
79 {6, 10}, /* CHANNEL 4 */
80 {6, 10}, /* CHANNEL 5 */
81 {6, 10}, /* CHANNEL 6 */
82 {6, 10}, /* CHANNEL 7 */
83 {3, 14}, /* CHANNEL 8 */
84 {1, 3}, /* CHANNEL 9 */
85 {1, 1}, /* CHANNEL 10 No Prescaler */
86 {15, 100}, /* CHANNEL 11 */
87 {1, 4}, /* CHANNEL 12 */
88 {1, 1}, /* CHANNEL 13 Reserved channels */
89 {1, 1}, /* CHANNEL 14 Reseved channels */
90 {5, 11}, /* CHANNEL 15 */
91};
92
93
94/*
95 * Conversion table from -3 to 55 degree Celcius
96 */
97static int therm_tbl[] = {
9830800, 29500, 28300, 27100,
9926000, 24900, 23900, 22900, 22000, 21100, 20300, 19400, 18700, 17900,
10017200, 16500, 15900, 15300, 14700, 14100, 13600, 13100, 12600, 12100,
10111600, 11200, 10800, 10400, 10000, 9630, 9280, 8950, 8620, 8310,
1028020, 7730, 7460, 7200, 6950, 6710, 6470, 6250, 6040, 5830,
1035640, 5450, 5260, 5090, 4920, 4760, 4600, 4450, 4310, 4170,
1044040, 3910, 3790, 3670, 3550
105};
106
107/*
108 * Structure containing the registers
109 * of different conversion methods supported by MADC.
110 * Hardware or RT real time conversion request initiated by external host
111 * processor for RT Signal conversions.
112 * External host processors can also request for non RT conversions
113 * SW1 and SW2 software conversions also called asynchronous or GPC request.
114 */
115static
116const struct twl4030_madc_conversion_method twl4030_conversion_methods[] = {
117 [TWL4030_MADC_RT] = {
118 .sel = TWL4030_MADC_RTSELECT_LSB,
119 .avg = TWL4030_MADC_RTAVERAGE_LSB,
120 .rbase = TWL4030_MADC_RTCH0_LSB,
121 },
122 [TWL4030_MADC_SW1] = {
123 .sel = TWL4030_MADC_SW1SELECT_LSB,
124 .avg = TWL4030_MADC_SW1AVERAGE_LSB,
125 .rbase = TWL4030_MADC_GPCH0_LSB,
126 .ctrl = TWL4030_MADC_CTRL_SW1,
127 },
128 [TWL4030_MADC_SW2] = {
129 .sel = TWL4030_MADC_SW2SELECT_LSB,
130 .avg = TWL4030_MADC_SW2AVERAGE_LSB,
131 .rbase = TWL4030_MADC_GPCH0_LSB,
132 .ctrl = TWL4030_MADC_CTRL_SW2,
133 },
134};
135
136/*
137 * Function to read a particular channel value.
138 * @madc - pointer to struct twl4030_madc_data
139 * @reg - lsb of ADC Channel
140 * If the i2c read fails it returns an error else returns 0.
141 */
142static int twl4030_madc_channel_raw_read(struct twl4030_madc_data *madc, u8 reg)
143{
144 u8 msb, lsb;
145 int ret;
146 /*
147 * For each ADC channel, we have MSB and LSB register pair. MSB address
148 * is always LSB address+1. reg parameter is the address of LSB register
149 */
150 ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &msb, reg + 1);
151 if (ret) {
152 dev_err(madc->dev, "unable to read MSB register 0x%X\n",
153 reg + 1);
154 return ret;
155 }
156 ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &lsb, reg);
157 if (ret) {
158 dev_err(madc->dev, "unable to read LSB register 0x%X\n", reg);
159 return ret;
160 }
161
162 return (int)(((msb << 8) | lsb) >> 6);
163}
164
165/*
166 * Return battery temperature
167 * Or < 0 on failure.
168 */
169static int twl4030battery_temperature(int raw_volt)
170{
171 u8 val;
172 int temp, curr, volt, res, ret;
173
174 volt = (raw_volt * TEMP_STEP_SIZE) / TEMP_PSR_R;
175 /* Getting and calculating the supply current in micro ampers */
176 ret = twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, &val,
177 REG_BCICTL2);
178 if (ret < 0)
179 return ret;
180 curr = ((val & TWL4030_BCI_ITHEN) + 1) * 10;
181 /* Getting and calculating the thermistor resistance in ohms */
182 res = volt * 1000 / curr;
183 /* calculating temperature */
184 for (temp = 58; temp >= 0; temp--) {
185 int actual = therm_tbl[temp];
186
187 if ((actual - res) >= 0)
188 break;
189 }
190
191 return temp + 1;
192}
193
194static int twl4030battery_current(int raw_volt)
195{
196 int ret;
197 u8 val;
198
199 ret = twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, &val,
200 TWL4030_BCI_BCICTL1);
201 if (ret)
202 return ret;
203 if (val & TWL4030_BCI_CGAIN) /* slope of 0.44 mV/mA */
204 return (raw_volt * CURR_STEP_SIZE) / CURR_PSR_R1;
205 else /* slope of 0.88 mV/mA */
206 return (raw_volt * CURR_STEP_SIZE) / CURR_PSR_R2;
207}
208/*
209 * Function to read channel values
210 * @madc - pointer to twl4030_madc_data struct
211 * @reg_base - Base address of the first channel
212 * @Channels - 16 bit bitmap. If the bit is set, channel value is read
213 * @buf - The channel values are stored here. if read fails error
214 * value is stored
215 * Returns the number of successfully read channels.
216 */
217static int twl4030_madc_read_channels(struct twl4030_madc_data *madc,
218 u8 reg_base, unsigned
219 long channels, int *buf)
220{
221 int count = 0, count_req = 0, i;
222 u8 reg;
223
224 for_each_set_bit(i, &channels, TWL4030_MADC_MAX_CHANNELS) {
225 reg = reg_base + 2 * i;
226 buf[i] = twl4030_madc_channel_raw_read(madc, reg);
227 if (buf[i] < 0) {
228 dev_err(madc->dev,
229 "Unable to read register 0x%X\n", reg);
230 count_req++;
231 continue;
232 }
233 switch (i) {
234 case 10:
235 buf[i] = twl4030battery_current(buf[i]);
236 if (buf[i] < 0) {
237 dev_err(madc->dev, "err reading current\n");
238 count_req++;
239 } else {
240 count++;
241 buf[i] = buf[i] - 750;
242 }
243 break;
244 case 1:
245 buf[i] = twl4030battery_temperature(buf[i]);
246 if (buf[i] < 0) {
247 dev_err(madc->dev, "err reading temperature\n");
248 count_req++;
249 } else {
250 buf[i] -= 3;
251 count++;
252 }
253 break;
254 default:
255 count++;
256 /* Analog Input (V) = conv_result * step_size / R
257 * conv_result = decimal value of 10-bit conversion
258 * result
259 * step size = 1.5 / (2 ^ 10 -1)
260 * R = Prescaler ratio for input channels.
261 * Result given in mV hence multiplied by 1000.
262 */
263 buf[i] = (buf[i] * 3 * 1000 *
264 twl4030_divider_ratios[i].denominator)
265 / (2 * 1023 *
266 twl4030_divider_ratios[i].numerator);
267 }
268 }
269 if (count_req)
270 dev_err(madc->dev, "%d channel conversion failed\n", count_req);
271
272 return count;
273}
274
275/*
276 * Enables irq.
277 * @madc - pointer to twl4030_madc_data struct
278 * @id - irq number to be enabled
279 * can take one of TWL4030_MADC_RT, TWL4030_MADC_SW1, TWL4030_MADC_SW2
280 * corresponding to RT, SW1, SW2 conversion requests.
281 * If the i2c read fails it returns an error else returns 0.
282 */
283static int twl4030_madc_enable_irq(struct twl4030_madc_data *madc, u8 id)
284{
285 u8 val;
286 int ret;
287
288 ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &val, madc->imr);
289 if (ret) {
290 dev_err(madc->dev, "unable to read imr register 0x%X\n",
291 madc->imr);
292 return ret;
293 }
294 val &= ~(1 << id);
295 ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, val, madc->imr);
296 if (ret) {
297 dev_err(madc->dev,
298 "unable to write imr register 0x%X\n", madc->imr);
299 return ret;
300
301 }
302
303 return 0;
304}
305
306/*
307 * Disables irq.
308 * @madc - pointer to twl4030_madc_data struct
309 * @id - irq number to be disabled
310 * can take one of TWL4030_MADC_RT, TWL4030_MADC_SW1, TWL4030_MADC_SW2
311 * corresponding to RT, SW1, SW2 conversion requests.
312 * Returns error if i2c read/write fails.
313 */
314static int twl4030_madc_disable_irq(struct twl4030_madc_data *madc, u8 id)
315{
316 u8 val;
317 int ret;
318
319 ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &val, madc->imr);
320 if (ret) {
321 dev_err(madc->dev, "unable to read imr register 0x%X\n",
322 madc->imr);
323 return ret;
324 }
325 val |= (1 << id);
326 ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, val, madc->imr);
327 if (ret) {
328 dev_err(madc->dev,
329 "unable to write imr register 0x%X\n", madc->imr);
330 return ret;
331 }
332
333 return 0;
334}
335
336static irqreturn_t twl4030_madc_threaded_irq_handler(int irq, void *_madc)
337{
338 struct twl4030_madc_data *madc = _madc;
339 const struct twl4030_madc_conversion_method *method;
340 u8 isr_val, imr_val;
341 int i, len, ret;
342 struct twl4030_madc_request *r;
343
344 mutex_lock(&madc->lock);
345 ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &isr_val, madc->isr);
346 if (ret) {
347 dev_err(madc->dev, "unable to read isr register 0x%X\n",
348 madc->isr);
349 goto err_i2c;
350 }
351 ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &imr_val, madc->imr);
352 if (ret) {
353 dev_err(madc->dev, "unable to read imr register 0x%X\n",
354 madc->imr);
355 goto err_i2c;
356 }
357 isr_val &= ~imr_val;
358 for (i = 0; i < TWL4030_MADC_NUM_METHODS; i++) {
359 if (!(isr_val & (1 << i)))
360 continue;
361 ret = twl4030_madc_disable_irq(madc, i);
362 if (ret < 0)
363 dev_dbg(madc->dev, "Disable interrupt failed%d\n", i);
364 madc->requests[i].result_pending = 1;
365 }
366 for (i = 0; i < TWL4030_MADC_NUM_METHODS; i++) {
367 r = &madc->requests[i];
368 /* No pending results for this method, move to next one */
369 if (!r->result_pending)
370 continue;
371 method = &twl4030_conversion_methods[r->method];
372 /* Read results */
373 len = twl4030_madc_read_channels(madc, method->rbase,
374 r->channels, r->rbuf);
375 /* Return results to caller */
376 if (r->func_cb != NULL) {
377 r->func_cb(len, r->channels, r->rbuf);
378 r->func_cb = NULL;
379 }
380 /* Free request */
381 r->result_pending = 0;
382 r->active = 0;
383 }
384 mutex_unlock(&madc->lock);
385
386 return IRQ_HANDLED;
387
388err_i2c:
389 /*
390 * In case of error check whichever request is active
391 * and service the same.
392 */
393 for (i = 0; i < TWL4030_MADC_NUM_METHODS; i++) {
394 r = &madc->requests[i];
395 if (r->active == 0)
396 continue;
397 method = &twl4030_conversion_methods[r->method];
398 /* Read results */
399 len = twl4030_madc_read_channels(madc, method->rbase,
400 r->channels, r->rbuf);
401 /* Return results to caller */
402 if (r->func_cb != NULL) {
403 r->func_cb(len, r->channels, r->rbuf);
404 r->func_cb = NULL;
405 }
406 /* Free request */
407 r->result_pending = 0;
408 r->active = 0;
409 }
410 mutex_unlock(&madc->lock);
411
412 return IRQ_HANDLED;
413}
414
415static int twl4030_madc_set_irq(struct twl4030_madc_data *madc,
416 struct twl4030_madc_request *req)
417{
418 struct twl4030_madc_request *p;
419 int ret;
420
421 p = &madc->requests[req->method];
422 memcpy(p, req, sizeof(*req));
423 ret = twl4030_madc_enable_irq(madc, req->method);
424 if (ret < 0) {
425 dev_err(madc->dev, "enable irq failed!!\n");
426 return ret;
427 }
428
429 return 0;
430}
431
432/*
433 * Function which enables the madc conversion
434 * by writing to the control register.
435 * @madc - pointer to twl4030_madc_data struct
436 * @conv_method - can be TWL4030_MADC_RT, TWL4030_MADC_SW2, TWL4030_MADC_SW1
437 * corresponding to RT SW1 or SW2 conversion methods.
438 * Returns 0 if succeeds else a negative error value
439 */
440static int twl4030_madc_start_conversion(struct twl4030_madc_data *madc,
441 int conv_method)
442{
443 const struct twl4030_madc_conversion_method *method;
444 int ret = 0;
445 method = &twl4030_conversion_methods[conv_method];
446 switch (conv_method) {
447 case TWL4030_MADC_SW1:
448 case TWL4030_MADC_SW2:
449 ret = twl_i2c_write_u8(TWL4030_MODULE_MADC,
450 TWL4030_MADC_SW_START, method->ctrl);
451 if (ret) {
452 dev_err(madc->dev,
453 "unable to write ctrl register 0x%X\n",
454 method->ctrl);
455 return ret;
456 }
457 break;
458 default:
459 break;
460 }
461
462 return 0;
463}
464
465/*
466 * Function that waits for conversion to be ready
467 * @madc - pointer to twl4030_madc_data struct
468 * @timeout_ms - timeout value in milliseconds
469 * @status_reg - ctrl register
470 * returns 0 if succeeds else a negative error value
471 */
472static int twl4030_madc_wait_conversion_ready(struct twl4030_madc_data *madc,
473 unsigned int timeout_ms,
474 u8 status_reg)
475{
476 unsigned long timeout;
477 int ret;
478
479 timeout = jiffies + msecs_to_jiffies(timeout_ms);
480 do {
481 u8 reg;
482
483 ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &reg, status_reg);
484 if (ret) {
485 dev_err(madc->dev,
486 "unable to read status register 0x%X\n",
487 status_reg);
488 return ret;
489 }
490 if (!(reg & TWL4030_MADC_BUSY) && (reg & TWL4030_MADC_EOC_SW))
491 return 0;
492 usleep_range(500, 2000);
493 } while (!time_after(jiffies, timeout));
494 dev_err(madc->dev, "conversion timeout!\n");
495
496 return -EAGAIN;
497}
498
499/*
500 * An exported function which can be called from other kernel drivers.
501 * @req twl4030_madc_request structure
502 * req->rbuf will be filled with read values of channels based on the
503 * channel index. If a particular channel reading fails there will
504 * be a negative error value in the corresponding array element.
505 * returns 0 if succeeds else error value
506 */
507int twl4030_madc_conversion(struct twl4030_madc_request *req)
508{
509 const struct twl4030_madc_conversion_method *method;
510 u8 ch_msb, ch_lsb;
511 int ret;
512
513 if (!req)
514 return -EINVAL;
515 mutex_lock(&twl4030_madc->lock);
516 if (req->method < TWL4030_MADC_RT || req->method > TWL4030_MADC_SW2) {
517 ret = -EINVAL;
518 goto out;
519 }
520 /* Do we have a conversion request ongoing */
521 if (twl4030_madc->requests[req->method].active) {
522 ret = -EBUSY;
523 goto out;
524 }
525 ch_msb = (req->channels >> 8) & 0xff;
526 ch_lsb = req->channels & 0xff;
527 method = &twl4030_conversion_methods[req->method];
528 /* Select channels to be converted */
529 ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, ch_msb, method->sel + 1);
530 if (ret) {
531 dev_err(twl4030_madc->dev,
532 "unable to write sel register 0x%X\n", method->sel + 1);
Sanjeev Premie178ccb2011-07-11 20:50:31 +0530533 goto out;
Keerthyf99c1d42011-03-01 19:12:26 +0530534 }
535 ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, ch_lsb, method->sel);
536 if (ret) {
537 dev_err(twl4030_madc->dev,
538 "unable to write sel register 0x%X\n", method->sel + 1);
Sanjeev Premie178ccb2011-07-11 20:50:31 +0530539 goto out;
Keerthyf99c1d42011-03-01 19:12:26 +0530540 }
541 /* Select averaging for all channels if do_avg is set */
542 if (req->do_avg) {
543 ret = twl_i2c_write_u8(TWL4030_MODULE_MADC,
544 ch_msb, method->avg + 1);
545 if (ret) {
546 dev_err(twl4030_madc->dev,
547 "unable to write avg register 0x%X\n",
548 method->avg + 1);
Sanjeev Premie178ccb2011-07-11 20:50:31 +0530549 goto out;
Keerthyf99c1d42011-03-01 19:12:26 +0530550 }
551 ret = twl_i2c_write_u8(TWL4030_MODULE_MADC,
552 ch_lsb, method->avg);
553 if (ret) {
554 dev_err(twl4030_madc->dev,
555 "unable to write sel reg 0x%X\n",
556 method->sel + 1);
Sanjeev Premie178ccb2011-07-11 20:50:31 +0530557 goto out;
Keerthyf99c1d42011-03-01 19:12:26 +0530558 }
559 }
560 if (req->type == TWL4030_MADC_IRQ_ONESHOT && req->func_cb != NULL) {
561 ret = twl4030_madc_set_irq(twl4030_madc, req);
562 if (ret < 0)
563 goto out;
564 ret = twl4030_madc_start_conversion(twl4030_madc, req->method);
565 if (ret < 0)
566 goto out;
567 twl4030_madc->requests[req->method].active = 1;
568 ret = 0;
569 goto out;
570 }
571 /* With RT method we should not be here anymore */
572 if (req->method == TWL4030_MADC_RT) {
573 ret = -EINVAL;
574 goto out;
575 }
576 ret = twl4030_madc_start_conversion(twl4030_madc, req->method);
577 if (ret < 0)
578 goto out;
579 twl4030_madc->requests[req->method].active = 1;
580 /* Wait until conversion is ready (ctrl register returns EOC) */
581 ret = twl4030_madc_wait_conversion_ready(twl4030_madc, 5, method->ctrl);
582 if (ret) {
583 twl4030_madc->requests[req->method].active = 0;
584 goto out;
585 }
586 ret = twl4030_madc_read_channels(twl4030_madc, method->rbase,
587 req->channels, req->rbuf);
588 twl4030_madc->requests[req->method].active = 0;
589
590out:
591 mutex_unlock(&twl4030_madc->lock);
592
593 return ret;
594}
595EXPORT_SYMBOL_GPL(twl4030_madc_conversion);
596
597/*
598 * Return channel value
599 * Or < 0 on failure.
600 */
601int twl4030_get_madc_conversion(int channel_no)
602{
603 struct twl4030_madc_request req;
604 int temp = 0;
605 int ret;
606
607 req.channels = (1 << channel_no);
608 req.method = TWL4030_MADC_SW2;
609 req.active = 0;
610 req.func_cb = NULL;
611 ret = twl4030_madc_conversion(&req);
612 if (ret < 0)
613 return ret;
614 if (req.rbuf[channel_no] > 0)
615 temp = req.rbuf[channel_no];
616
617 return temp;
618}
619EXPORT_SYMBOL_GPL(twl4030_get_madc_conversion);
620
621/*
622 * Function to enable or disable bias current for
623 * main battery type reading or temperature sensing
624 * @madc - pointer to twl4030_madc_data struct
625 * @chan - can be one of the two values
626 * TWL4030_BCI_ITHEN - Enables bias current for main battery type reading
627 * TWL4030_BCI_TYPEN - Enables bias current for main battery temperature
628 * sensing
629 * @on - enable or disable chan.
630 */
631static int twl4030_madc_set_current_generator(struct twl4030_madc_data *madc,
632 int chan, int on)
633{
634 int ret;
635 u8 regval;
636
637 ret = twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE,
638 &regval, TWL4030_BCI_BCICTL1);
639 if (ret) {
640 dev_err(madc->dev, "unable to read BCICTL1 reg 0x%X",
641 TWL4030_BCI_BCICTL1);
642 return ret;
643 }
644 if (on)
645 regval |= chan ? TWL4030_BCI_ITHEN : TWL4030_BCI_TYPEN;
646 else
647 regval &= chan ? ~TWL4030_BCI_ITHEN : ~TWL4030_BCI_TYPEN;
648 ret = twl_i2c_write_u8(TWL4030_MODULE_MAIN_CHARGE,
649 regval, TWL4030_BCI_BCICTL1);
650 if (ret) {
651 dev_err(madc->dev, "unable to write BCICTL1 reg 0x%X\n",
652 TWL4030_BCI_BCICTL1);
653 return ret;
654 }
655
656 return 0;
657}
658
659/*
660 * Function that sets MADC software power on bit to enable MADC
661 * @madc - pointer to twl4030_madc_data struct
662 * @on - Enable or disable MADC software powen on bit.
663 * returns error if i2c read/write fails else 0
664 */
665static int twl4030_madc_set_power(struct twl4030_madc_data *madc, int on)
666{
667 u8 regval;
668 int ret;
669
670 ret = twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE,
671 &regval, TWL4030_MADC_CTRL1);
672 if (ret) {
673 dev_err(madc->dev, "unable to read madc ctrl1 reg 0x%X\n",
674 TWL4030_MADC_CTRL1);
675 return ret;
676 }
677 if (on)
678 regval |= TWL4030_MADC_MADCON;
679 else
680 regval &= ~TWL4030_MADC_MADCON;
681 ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, regval, TWL4030_MADC_CTRL1);
682 if (ret) {
683 dev_err(madc->dev, "unable to write madc ctrl1 reg 0x%X\n",
684 TWL4030_MADC_CTRL1);
685 return ret;
686 }
687
688 return 0;
689}
690
691/*
692 * Initialize MADC and request for threaded irq
693 */
694static int __devinit twl4030_madc_probe(struct platform_device *pdev)
695{
696 struct twl4030_madc_data *madc;
697 struct twl4030_madc_platform_data *pdata = pdev->dev.platform_data;
698 int ret;
699 u8 regval;
700
701 if (!pdata) {
702 dev_err(&pdev->dev, "platform_data not available\n");
703 return -EINVAL;
704 }
705 madc = kzalloc(sizeof(*madc), GFP_KERNEL);
706 if (!madc)
707 return -ENOMEM;
708
709 /*
710 * Phoenix provides 2 interrupt lines. The first one is connected to
711 * the OMAP. The other one can be connected to the other processor such
712 * as modem. Hence two separate ISR and IMR registers.
713 */
714 madc->imr = (pdata->irq_line == 1) ?
715 TWL4030_MADC_IMR1 : TWL4030_MADC_IMR2;
716 madc->isr = (pdata->irq_line == 1) ?
717 TWL4030_MADC_ISR1 : TWL4030_MADC_ISR2;
718 ret = twl4030_madc_set_power(madc, 1);
719 if (ret < 0)
720 goto err_power;
721 ret = twl4030_madc_set_current_generator(madc, 0, 1);
722 if (ret < 0)
723 goto err_current_generator;
724
725 ret = twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE,
726 &regval, TWL4030_BCI_BCICTL1);
727 if (ret) {
728 dev_err(&pdev->dev, "unable to read reg BCI CTL1 0x%X\n",
729 TWL4030_BCI_BCICTL1);
730 goto err_i2c;
731 }
732 regval |= TWL4030_BCI_MESBAT;
733 ret = twl_i2c_write_u8(TWL4030_MODULE_MAIN_CHARGE,
734 regval, TWL4030_BCI_BCICTL1);
735 if (ret) {
736 dev_err(&pdev->dev, "unable to write reg BCI Ctl1 0x%X\n",
737 TWL4030_BCI_BCICTL1);
738 goto err_i2c;
739 }
740 platform_set_drvdata(pdev, madc);
741 mutex_init(&madc->lock);
742 ret = request_threaded_irq(platform_get_irq(pdev, 0), NULL,
743 twl4030_madc_threaded_irq_handler,
744 IRQF_TRIGGER_RISING, "twl4030_madc", madc);
745 if (ret) {
746 dev_dbg(&pdev->dev, "could not request irq\n");
747 goto err_irq;
748 }
749 twl4030_madc = madc;
750 return 0;
751err_irq:
752 platform_set_drvdata(pdev, NULL);
753err_i2c:
754 twl4030_madc_set_current_generator(madc, 0, 0);
755err_current_generator:
756 twl4030_madc_set_power(madc, 0);
757err_power:
758 kfree(madc);
759
760 return ret;
761}
762
763static int __devexit twl4030_madc_remove(struct platform_device *pdev)
764{
765 struct twl4030_madc_data *madc = platform_get_drvdata(pdev);
766
767 free_irq(platform_get_irq(pdev, 0), madc);
768 platform_set_drvdata(pdev, NULL);
769 twl4030_madc_set_current_generator(madc, 0, 0);
770 twl4030_madc_set_power(madc, 0);
771 kfree(madc);
772
773 return 0;
774}
775
776static struct platform_driver twl4030_madc_driver = {
777 .probe = twl4030_madc_probe,
778 .remove = __exit_p(twl4030_madc_remove),
779 .driver = {
780 .name = "twl4030_madc",
781 .owner = THIS_MODULE,
782 },
783};
784
785static int __init twl4030_madc_init(void)
786{
787 return platform_driver_register(&twl4030_madc_driver);
788}
789
790module_init(twl4030_madc_init);
791
792static void __exit twl4030_madc_exit(void)
793{
794 platform_driver_unregister(&twl4030_madc_driver);
795}
796
797module_exit(twl4030_madc_exit);
798
799MODULE_DESCRIPTION("TWL4030 ADC driver");
800MODULE_LICENSE("GPL");
801MODULE_AUTHOR("J Keerthy");
Axel Lin0ea3e832011-03-07 11:02:29 +0800802MODULE_ALIAS("platform:twl4030_madc");