blob: 7cacbaa68efe410902c64bb04c3a68619c4cd689 [file] [log] [blame]
Grazvydas Ignotas2e727f12010-09-27 23:18:24 +03001/*
2 * TWL4030/TPS65950 BCI (Battery Charger Interface) driver
3 *
4 * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com>
5 *
6 * based on twl4030_bci_battery.c by TI
7 * Copyright (C) 2008 Texas Instruments, Inc.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 */
14
15#include <linux/init.h>
16#include <linux/module.h>
17#include <linux/slab.h>
Kishon Vijay Abraham Ided017e2012-06-26 17:40:32 +053018#include <linux/err.h>
Grazvydas Ignotas2e727f12010-09-27 23:18:24 +030019#include <linux/platform_device.h>
20#include <linux/interrupt.h>
21#include <linux/i2c/twl.h>
22#include <linux/power_supply.h>
23#include <linux/notifier.h>
24#include <linux/usb/otg.h>
25
26#define TWL4030_BCIMSTATEC 0x02
27#define TWL4030_BCIICHG 0x08
28#define TWL4030_BCIVAC 0x0a
29#define TWL4030_BCIVBUS 0x0c
30#define TWL4030_BCIMFSTS4 0x10
31#define TWL4030_BCICTL1 0x23
32
33#define TWL4030_BCIAUTOWEN BIT(5)
34#define TWL4030_CONFIG_DONE BIT(4)
35#define TWL4030_BCIAUTOUSB BIT(1)
36#define TWL4030_BCIAUTOAC BIT(0)
37#define TWL4030_CGAIN BIT(5)
38#define TWL4030_USBFASTMCHG BIT(2)
39#define TWL4030_STS_VBUS BIT(7)
40#define TWL4030_STS_USB_ID BIT(2)
41
42/* BCI interrupts */
43#define TWL4030_WOVF BIT(0) /* Watchdog overflow */
44#define TWL4030_TMOVF BIT(1) /* Timer overflow */
45#define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */
46#define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */
47#define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */
48#define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */
49#define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */
50#define TWL4030_BATSTS BIT(7) /* Battery status */
51
52#define TWL4030_VBATLVL BIT(0) /* VBAT level */
53#define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */
54#define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */
55#define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */
56
57#define TWL4030_MSTATEC_USB BIT(4)
58#define TWL4030_MSTATEC_AC BIT(5)
59#define TWL4030_MSTATEC_MASK 0x0f
60#define TWL4030_MSTATEC_QUICK1 0x02
61#define TWL4030_MSTATEC_QUICK7 0x07
62#define TWL4030_MSTATEC_COMPLETE1 0x0b
63#define TWL4030_MSTATEC_COMPLETE4 0x0e
64
65static bool allow_usb;
Grazvydas Ignotas28d48f02011-06-03 14:43:11 +030066module_param(allow_usb, bool, 0644);
Grazvydas Ignotas2e727f12010-09-27 23:18:24 +030067MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
68
69struct twl4030_bci {
70 struct device *dev;
71 struct power_supply ac;
72 struct power_supply usb;
Heikki Krogerus86753812012-02-13 13:24:02 +020073 struct usb_phy *transceiver;
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +020074 struct notifier_block usb_nb;
Heikki Krogerusd6ccc442011-02-25 13:56:36 +020075 struct work_struct work;
Grazvydas Ignotas2e727f12010-09-27 23:18:24 +030076 int irq_chg;
77 int irq_bci;
Heikki Krogerusd6ccc442011-02-25 13:56:36 +020078
79 unsigned long event;
Grazvydas Ignotas2e727f12010-09-27 23:18:24 +030080};
81
82/*
83 * clear and set bits on an given register on a given module
84 */
85static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
86{
87 u8 val = 0;
88 int ret;
89
90 ret = twl_i2c_read_u8(mod_no, &val, reg);
91 if (ret)
92 return ret;
93
94 val &= ~clear;
95 val |= set;
96
97 return twl_i2c_write_u8(mod_no, val, reg);
98}
99
100static int twl4030_bci_read(u8 reg, u8 *val)
101{
102 return twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg);
103}
104
105static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
106{
107 return twl4030_clear_set(TWL4030_MODULE_PM_MASTER, 0,
108 TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
109 TWL4030_PM_MASTER_BOOT_BCI);
110}
111
112static int twl4030bci_read_adc_val(u8 reg)
113{
114 int ret, temp;
115 u8 val;
116
117 /* read MSB */
118 ret = twl4030_bci_read(reg + 1, &val);
119 if (ret)
120 return ret;
121
122 temp = (int)(val & 0x03) << 8;
123
124 /* read LSB */
125 ret = twl4030_bci_read(reg, &val);
126 if (ret)
127 return ret;
128
129 return temp | val;
130}
131
132/*
133 * Check if VBUS power is present
134 */
135static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
136{
137 int ret;
138 u8 hwsts;
139
140 ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hwsts,
141 TWL4030_PM_MASTER_STS_HW_CONDITIONS);
142 if (ret < 0)
143 return 0;
144
145 dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
146
147 /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
148 if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
149 return 1;
150
151 return 0;
152}
153
154/*
155 * Enable/Disable USB Charge funtionality.
156 */
157static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
158{
159 int ret;
160
161 if (enable) {
162 /* Check for USB charger conneted */
163 if (!twl4030_bci_have_vbus(bci))
164 return -ENODEV;
165
166 /*
167 * Until we can find out what current the device can provide,
168 * require a module param to enable USB charging.
169 */
170 if (!allow_usb) {
171 dev_warn(bci->dev, "USB charging is disabled.\n");
172 return -EACCES;
173 }
174
175 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
176 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
177 if (ret < 0)
178 return ret;
179
180 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
181 ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE, 0,
182 TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
183 } else {
184 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
185 }
186
187 return ret;
188}
189
190/*
191 * Enable/Disable AC Charge funtionality.
192 */
193static int twl4030_charger_enable_ac(bool enable)
194{
195 int ret;
196
197 if (enable)
198 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
199 else
200 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
201
202 return ret;
203}
204
205/*
206 * TWL4030 CHG_PRES (AC charger presence) events
207 */
208static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
209{
210 struct twl4030_bci *bci = arg;
211
212 dev_dbg(bci->dev, "CHG_PRES irq\n");
213 power_supply_changed(&bci->ac);
214 power_supply_changed(&bci->usb);
215
216 return IRQ_HANDLED;
217}
218
219/*
220 * TWL4030 BCI monitoring events
221 */
222static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
223{
224 struct twl4030_bci *bci = arg;
225 u8 irqs1, irqs2;
226 int ret;
227
228 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
229 TWL4030_INTERRUPTS_BCIISR1A);
230 if (ret < 0)
231 return IRQ_HANDLED;
232
233 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
234 TWL4030_INTERRUPTS_BCIISR2A);
235 if (ret < 0)
236 return IRQ_HANDLED;
237
238 dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
239
240 if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
241 /* charger state change, inform the core */
242 power_supply_changed(&bci->ac);
243 power_supply_changed(&bci->usb);
244 }
245
246 /* various monitoring events, for now we just log them here */
247 if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
248 dev_warn(bci->dev, "battery temperature out of range\n");
249
250 if (irqs1 & TWL4030_BATSTS)
251 dev_crit(bci->dev, "battery disconnected\n");
252
253 if (irqs2 & TWL4030_VBATOV)
254 dev_crit(bci->dev, "VBAT overvoltage\n");
255
256 if (irqs2 & TWL4030_VBUSOV)
257 dev_crit(bci->dev, "VBUS overvoltage\n");
258
259 if (irqs2 & TWL4030_ACCHGOV)
260 dev_crit(bci->dev, "Ac charger overvoltage\n");
261
262 return IRQ_HANDLED;
263}
264
Heikki Krogerusd6ccc442011-02-25 13:56:36 +0200265static void twl4030_bci_usb_work(struct work_struct *data)
Grazvydas Ignotas2e727f12010-09-27 23:18:24 +0300266{
Heikki Krogerusd6ccc442011-02-25 13:56:36 +0200267 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
Grazvydas Ignotas2e727f12010-09-27 23:18:24 +0300268
Heikki Krogerusd6ccc442011-02-25 13:56:36 +0200269 switch (bci->event) {
Grazvydas Ignotas2e727f12010-09-27 23:18:24 +0300270 case USB_EVENT_VBUS:
271 case USB_EVENT_CHARGER:
272 twl4030_charger_enable_usb(bci, true);
273 break;
274 case USB_EVENT_NONE:
275 twl4030_charger_enable_usb(bci, false);
276 break;
277 }
Heikki Krogerusd6ccc442011-02-25 13:56:36 +0200278}
279
280static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
281 void *priv)
282{
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200283 struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
Heikki Krogerusd6ccc442011-02-25 13:56:36 +0200284
285 dev_dbg(bci->dev, "OTG notify %lu\n", val);
286
287 bci->event = val;
288 schedule_work(&bci->work);
Grazvydas Ignotas2e727f12010-09-27 23:18:24 +0300289
290 return NOTIFY_OK;
291}
292
293/*
294 * TI provided formulas:
295 * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
296 * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
297 * Here we use integer approximation of:
298 * CGAIN == 0: val * 1.6618 - 0.85
299 * CGAIN == 1: (val * 1.6618 - 0.85) * 2
300 */
301static int twl4030_charger_get_current(void)
302{
303 int curr;
304 int ret;
305 u8 bcictl1;
306
307 curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
308 if (curr < 0)
309 return curr;
310
311 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
312 if (ret)
313 return ret;
314
315 ret = (curr * 16618 - 850 * 10000) / 10;
316 if (bcictl1 & TWL4030_CGAIN)
317 ret *= 2;
318
319 return ret;
320}
321
322/*
323 * Returns the main charge FSM state
324 * Or < 0 on failure.
325 */
326static int twl4030bci_state(struct twl4030_bci *bci)
327{
328 int ret;
329 u8 state;
330
331 ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
332 if (ret) {
333 pr_err("twl4030_bci: error reading BCIMSTATEC\n");
334 return ret;
335 }
336
337 dev_dbg(bci->dev, "state: %02x\n", state);
338
339 return state;
340}
341
342static int twl4030_bci_state_to_status(int state)
343{
344 state &= TWL4030_MSTATEC_MASK;
345 if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
346 return POWER_SUPPLY_STATUS_CHARGING;
347 else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
348 state <= TWL4030_MSTATEC_COMPLETE4)
349 return POWER_SUPPLY_STATUS_FULL;
350 else
351 return POWER_SUPPLY_STATUS_NOT_CHARGING;
352}
353
354static int twl4030_bci_get_property(struct power_supply *psy,
355 enum power_supply_property psp,
356 union power_supply_propval *val)
357{
358 struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent);
359 int is_charging;
360 int state;
361 int ret;
362
363 state = twl4030bci_state(bci);
364 if (state < 0)
365 return state;
366
367 if (psy->type == POWER_SUPPLY_TYPE_USB)
368 is_charging = state & TWL4030_MSTATEC_USB;
369 else
370 is_charging = state & TWL4030_MSTATEC_AC;
371
372 switch (psp) {
373 case POWER_SUPPLY_PROP_STATUS:
374 if (is_charging)
375 val->intval = twl4030_bci_state_to_status(state);
376 else
377 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
378 break;
379 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
380 /* charging must be active for meaningful result */
381 if (!is_charging)
382 return -ENODATA;
383 if (psy->type == POWER_SUPPLY_TYPE_USB) {
384 ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
385 if (ret < 0)
386 return ret;
387 /* BCIVBUS uses ADCIN8, 7/1023 V/step */
388 val->intval = ret * 6843;
389 } else {
390 ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
391 if (ret < 0)
392 return ret;
393 /* BCIVAC uses ADCIN11, 10/1023 V/step */
394 val->intval = ret * 9775;
395 }
396 break;
397 case POWER_SUPPLY_PROP_CURRENT_NOW:
398 if (!is_charging)
399 return -ENODATA;
400 /* current measurement is shared between AC and USB */
401 ret = twl4030_charger_get_current();
402 if (ret < 0)
403 return ret;
404 val->intval = ret;
405 break;
406 case POWER_SUPPLY_PROP_ONLINE:
407 val->intval = is_charging &&
408 twl4030_bci_state_to_status(state) !=
409 POWER_SUPPLY_STATUS_NOT_CHARGING;
410 break;
411 default:
412 return -EINVAL;
413 }
414
415 return 0;
416}
417
418static enum power_supply_property twl4030_charger_props[] = {
419 POWER_SUPPLY_PROP_STATUS,
420 POWER_SUPPLY_PROP_ONLINE,
421 POWER_SUPPLY_PROP_VOLTAGE_NOW,
422 POWER_SUPPLY_PROP_CURRENT_NOW,
423};
424
425static int __init twl4030_bci_probe(struct platform_device *pdev)
426{
427 struct twl4030_bci *bci;
428 int ret;
Grazvydas Ignotas28d48f02011-06-03 14:43:11 +0300429 u32 reg;
Grazvydas Ignotas2e727f12010-09-27 23:18:24 +0300430
431 bci = kzalloc(sizeof(*bci), GFP_KERNEL);
432 if (bci == NULL)
433 return -ENOMEM;
434
435 bci->dev = &pdev->dev;
436 bci->irq_chg = platform_get_irq(pdev, 0);
437 bci->irq_bci = platform_get_irq(pdev, 1);
438
439 platform_set_drvdata(pdev, bci);
440
441 bci->ac.name = "twl4030_ac";
442 bci->ac.type = POWER_SUPPLY_TYPE_MAINS;
443 bci->ac.properties = twl4030_charger_props;
444 bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props);
445 bci->ac.get_property = twl4030_bci_get_property;
446
447 ret = power_supply_register(&pdev->dev, &bci->ac);
448 if (ret) {
449 dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
450 goto fail_register_ac;
451 }
452
453 bci->usb.name = "twl4030_usb";
454 bci->usb.type = POWER_SUPPLY_TYPE_USB;
455 bci->usb.properties = twl4030_charger_props;
456 bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
457 bci->usb.get_property = twl4030_bci_get_property;
458
459 ret = power_supply_register(&pdev->dev, &bci->usb);
460 if (ret) {
461 dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
462 goto fail_register_usb;
463 }
464
465 ret = request_threaded_irq(bci->irq_chg, NULL,
466 twl4030_charger_interrupt, 0, pdev->name, bci);
467 if (ret < 0) {
468 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
469 bci->irq_chg, ret);
470 goto fail_chg_irq;
471 }
472
473 ret = request_threaded_irq(bci->irq_bci, NULL,
474 twl4030_bci_interrupt, 0, pdev->name, bci);
475 if (ret < 0) {
476 dev_err(&pdev->dev, "could not request irq %d, status %d\n",
477 bci->irq_bci, ret);
478 goto fail_bci_irq;
479 }
480
Heikki Krogerusd6ccc442011-02-25 13:56:36 +0200481 INIT_WORK(&bci->work, twl4030_bci_usb_work);
482
Kishon Vijay Abraham I662dca52012-06-22 17:02:46 +0530483 bci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
Kishon Vijay Abraham Ided017e2012-06-26 17:40:32 +0530484 if (!IS_ERR_OR_NULL(bci->transceiver)) {
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200485 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
486 usb_register_notifier(bci->transceiver, &bci->usb_nb);
Grazvydas Ignotas2e727f12010-09-27 23:18:24 +0300487 }
488
489 /* Enable interrupts now. */
Grazvydas Ignotas28d48f02011-06-03 14:43:11 +0300490 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
Grazvydas Ignotas2e727f12010-09-27 23:18:24 +0300491 TWL4030_TBATOR1 | TWL4030_BATSTS);
492 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
493 TWL4030_INTERRUPTS_BCIIMR1A);
494 if (ret < 0) {
495 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
496 goto fail_unmask_interrupts;
497 }
498
Grazvydas Ignotas28d48f02011-06-03 14:43:11 +0300499 reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
Grazvydas Ignotas2e727f12010-09-27 23:18:24 +0300500 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
501 TWL4030_INTERRUPTS_BCIIMR2A);
502 if (ret < 0)
503 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
504
505 twl4030_charger_enable_ac(true);
506 twl4030_charger_enable_usb(bci, true);
507
508 return 0;
509
510fail_unmask_interrupts:
Kishon Vijay Abraham Ided017e2012-06-26 17:40:32 +0530511 if (!IS_ERR_OR_NULL(bci->transceiver)) {
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200512 usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
Kishon Vijay Abraham I721002e2012-06-22 17:02:45 +0530513 usb_put_phy(bci->transceiver);
Grazvydas Ignotas2e727f12010-09-27 23:18:24 +0300514 }
515 free_irq(bci->irq_bci, bci);
516fail_bci_irq:
517 free_irq(bci->irq_chg, bci);
518fail_chg_irq:
519 power_supply_unregister(&bci->usb);
520fail_register_usb:
521 power_supply_unregister(&bci->ac);
522fail_register_ac:
523 platform_set_drvdata(pdev, NULL);
524 kfree(bci);
525
526 return ret;
527}
528
529static int __exit twl4030_bci_remove(struct platform_device *pdev)
530{
531 struct twl4030_bci *bci = platform_get_drvdata(pdev);
532
533 twl4030_charger_enable_ac(false);
534 twl4030_charger_enable_usb(bci, false);
535
536 /* mask interrupts */
537 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
538 TWL4030_INTERRUPTS_BCIIMR1A);
539 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
540 TWL4030_INTERRUPTS_BCIIMR2A);
541
Kishon Vijay Abraham Ided017e2012-06-26 17:40:32 +0530542 if (!IS_ERR_OR_NULL(bci->transceiver)) {
Heikki Krogerusfcc8ebc2012-02-13 13:24:16 +0200543 usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
Kishon Vijay Abraham I721002e2012-06-22 17:02:45 +0530544 usb_put_phy(bci->transceiver);
Grazvydas Ignotas2e727f12010-09-27 23:18:24 +0300545 }
546 free_irq(bci->irq_bci, bci);
547 free_irq(bci->irq_chg, bci);
548 power_supply_unregister(&bci->usb);
549 power_supply_unregister(&bci->ac);
550 platform_set_drvdata(pdev, NULL);
551 kfree(bci);
552
553 return 0;
554}
555
556static struct platform_driver twl4030_bci_driver = {
557 .driver = {
558 .name = "twl4030_bci",
559 .owner = THIS_MODULE,
560 },
561 .remove = __exit_p(twl4030_bci_remove),
562};
563
564static int __init twl4030_bci_init(void)
565{
566 return platform_driver_probe(&twl4030_bci_driver, twl4030_bci_probe);
567}
568module_init(twl4030_bci_init);
569
570static void __exit twl4030_bci_exit(void)
571{
572 platform_driver_unregister(&twl4030_bci_driver);
573}
574module_exit(twl4030_bci_exit);
575
Grazvydas Ignotas28d48f02011-06-03 14:43:11 +0300576MODULE_AUTHOR("Gražvydas Ignotas");
Grazvydas Ignotas2e727f12010-09-27 23:18:24 +0300577MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
578MODULE_LICENSE("GPL");
579MODULE_ALIAS("platform:twl4030_bci");