aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--drivers/mfd/Kconfig10
-rw-r--r--drivers/mfd/Makefile1
-rw-r--r--drivers/mfd/twl4030-madc.c802
-rw-r--r--include/linux/i2c/twl4030-madc.h141
4 files changed, 954 insertions, 0 deletions
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index d71af4531b14..50c476964e48 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -178,6 +178,16 @@ config TWL4030_CORE
178 high speed USB OTG transceiver, an audio codec (on most 178 high speed USB OTG transceiver, an audio codec (on most
179 versions) and many other features. 179 versions) and many other features.
180 180
181config TWL4030_MADC
182 tristate "Texas Instruments TWL4030 MADC"
183 depends on TWL4030_CORE
184 help
185 This driver provides support for triton TWL4030-MADC. The
186 driver supports both RT and SW conversion methods.
187
188 This driver can be built as a module. If so it will be
189 named twl4030-madc
190
181config TWL4030_POWER 191config TWL4030_POWER
182 bool "Support power resources on TWL4030 family chips" 192 bool "Support power resources on TWL4030 family chips"
183 depends on TWL4030_CORE && ARM 193 depends on TWL4030_CORE && ARM
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index ad71bd59345f..25f3c7551489 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_TPS6507X) += tps6507x.o
38obj-$(CONFIG_MENELAUS) += menelaus.o 38obj-$(CONFIG_MENELAUS) += menelaus.o
39 39
40obj-$(CONFIG_TWL4030_CORE) += twl-core.o twl4030-irq.o twl6030-irq.o 40obj-$(CONFIG_TWL4030_CORE) += twl-core.o twl4030-irq.o twl6030-irq.o
41obj-$(CONFIG_TWL4030_MADC) += twl4030-madc.o
41obj-$(CONFIG_TWL4030_POWER) += twl4030-power.o 42obj-$(CONFIG_TWL4030_POWER) += twl4030-power.o
42obj-$(CONFIG_TWL4030_CODEC) += twl4030-codec.o 43obj-$(CONFIG_TWL4030_CODEC) += twl4030-codec.o
43obj-$(CONFIG_TWL6030_PWM) += twl6030-pwm.o 44obj-$(CONFIG_TWL6030_PWM) += twl6030-pwm.o
diff --git a/drivers/mfd/twl4030-madc.c b/drivers/mfd/twl4030-madc.c
new file mode 100644
index 000000000000..e9884e2583bf
--- /dev/null
+++ b/drivers/mfd/twl4030-madc.c
@@ -0,0 +1,802 @@
1/*
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);
533 return ret;
534 }
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);
539 return ret;
540 }
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);
549 return ret;
550 }
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);
557 return ret;
558 }
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");
802MODULE_ALIAS("twl4030_madc");
diff --git a/include/linux/i2c/twl4030-madc.h b/include/linux/i2c/twl4030-madc.h
new file mode 100644
index 000000000000..6427d298fbfc
--- /dev/null
+++ b/include/linux/i2c/twl4030-madc.h
@@ -0,0 +1,141 @@
1/*
2 * twl4030_madc.h - Header for TWL4030 MADC
3 *
4 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
5 * J Keerthy <j-keerthy@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * version 2 as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * 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., 51 Franklin St, Fifth Floor, Boston, MA
19 * 02110-1301 USA
20 *
21 */
22
23#ifndef _TWL4030_MADC_H
24#define _TWL4030_MADC_H
25
26struct twl4030_madc_conversion_method {
27 u8 sel;
28 u8 avg;
29 u8 rbase;
30 u8 ctrl;
31};
32
33#define TWL4030_MADC_MAX_CHANNELS 16
34
35
36/*
37 * twl4030_madc_request- madc request packet for channel conversion
38 * @channels: 16 bit bitmap for individual channels
39 * @do_avgP: sample the input channel for 4 consecutive cycles
40 * @method: RT, SW1, SW2
41 * @type: Polling or interrupt based method
42 */
43
44struct twl4030_madc_request {
45 unsigned long channels;
46 u16 do_avg;
47 u16 method;
48 u16 type;
49 bool active;
50 bool result_pending;
51 int rbuf[TWL4030_MADC_MAX_CHANNELS];
52 void (*func_cb)(int len, int channels, int *buf);
53};
54
55enum conversion_methods {
56 TWL4030_MADC_RT,
57 TWL4030_MADC_SW1,
58 TWL4030_MADC_SW2,
59 TWL4030_MADC_NUM_METHODS
60};
61
62enum sample_type {
63 TWL4030_MADC_WAIT,
64 TWL4030_MADC_IRQ_ONESHOT,
65 TWL4030_MADC_IRQ_REARM
66};
67
68#define TWL4030_MADC_CTRL1 0x00
69#define TWL4030_MADC_CTRL2 0x01
70
71#define TWL4030_MADC_RTSELECT_LSB 0x02
72#define TWL4030_MADC_SW1SELECT_LSB 0x06
73#define TWL4030_MADC_SW2SELECT_LSB 0x0A
74
75#define TWL4030_MADC_RTAVERAGE_LSB 0x04
76#define TWL4030_MADC_SW1AVERAGE_LSB 0x08
77#define TWL4030_MADC_SW2AVERAGE_LSB 0x0C
78
79#define TWL4030_MADC_CTRL_SW1 0x12
80#define TWL4030_MADC_CTRL_SW2 0x13
81
82#define TWL4030_MADC_RTCH0_LSB 0x17
83#define TWL4030_MADC_GPCH0_LSB 0x37
84
85#define TWL4030_MADC_MADCON (1 << 0) /* MADC power on */
86#define TWL4030_MADC_BUSY (1 << 0) /* MADC busy */
87/* MADC conversion completion */
88#define TWL4030_MADC_EOC_SW (1 << 1)
89/* MADC SWx start conversion */
90#define TWL4030_MADC_SW_START (1 << 5)
91#define TWL4030_MADC_ADCIN0 (1 << 0)
92#define TWL4030_MADC_ADCIN1 (1 << 1)
93#define TWL4030_MADC_ADCIN2 (1 << 2)
94#define TWL4030_MADC_ADCIN3 (1 << 3)
95#define TWL4030_MADC_ADCIN4 (1 << 4)
96#define TWL4030_MADC_ADCIN5 (1 << 5)
97#define TWL4030_MADC_ADCIN6 (1 << 6)
98#define TWL4030_MADC_ADCIN7 (1 << 7)
99#define TWL4030_MADC_ADCIN8 (1 << 8)
100#define TWL4030_MADC_ADCIN9 (1 << 9)
101#define TWL4030_MADC_ADCIN10 (1 << 10)
102#define TWL4030_MADC_ADCIN11 (1 << 11)
103#define TWL4030_MADC_ADCIN12 (1 << 12)
104#define TWL4030_MADC_ADCIN13 (1 << 13)
105#define TWL4030_MADC_ADCIN14 (1 << 14)
106#define TWL4030_MADC_ADCIN15 (1 << 15)
107
108/* Fixed channels */
109#define TWL4030_MADC_BTEMP TWL4030_MADC_ADCIN1
110#define TWL4030_MADC_VBUS TWL4030_MADC_ADCIN8
111#define TWL4030_MADC_VBKB TWL4030_MADC_ADCIN9
112#define TWL4030_MADC_ICHG TWL4030_MADC_ADCIN10
113#define TWL4030_MADC_VCHG TWL4030_MADC_ADCIN11
114#define TWL4030_MADC_VBAT TWL4030_MADC_ADCIN12
115
116/* Step size and prescaler ratio */
117#define TEMP_STEP_SIZE 147
118#define TEMP_PSR_R 100
119#define CURR_STEP_SIZE 147
120#define CURR_PSR_R1 44
121#define CURR_PSR_R2 88
122
123#define TWL4030_BCI_BCICTL1 0x23
124#define TWL4030_BCI_CGAIN 0x020
125#define TWL4030_BCI_MESBAT (1 << 1)
126#define TWL4030_BCI_TYPEN (1 << 4)
127#define TWL4030_BCI_ITHEN (1 << 3)
128
129#define REG_BCICTL2 0x024
130#define TWL4030_BCI_ITHSENS 0x007
131
132struct twl4030_madc_user_parms {
133 int channel;
134 int average;
135 int status;
136 u16 result;
137};
138
139int twl4030_madc_conversion(struct twl4030_madc_request *conv);
140int twl4030_get_madc_conversion(int channel_no);
141#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-30 06:33:31 -0500