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2e727f17 GI |
1 | /* |
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> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/i2c/twl.h> | |
21 | #include <linux/power_supply.h> | |
22 | #include <linux/notifier.h> | |
23 | #include <linux/usb/otg.h> | |
24 | ||
25 | #define TWL4030_BCIMSTATEC 0x02 | |
26 | #define TWL4030_BCIICHG 0x08 | |
27 | #define TWL4030_BCIVAC 0x0a | |
28 | #define TWL4030_BCIVBUS 0x0c | |
29 | #define TWL4030_BCIMFSTS4 0x10 | |
30 | #define TWL4030_BCICTL1 0x23 | |
31 | ||
32 | #define TWL4030_BCIAUTOWEN BIT(5) | |
33 | #define TWL4030_CONFIG_DONE BIT(4) | |
34 | #define TWL4030_BCIAUTOUSB BIT(1) | |
35 | #define TWL4030_BCIAUTOAC BIT(0) | |
36 | #define TWL4030_CGAIN BIT(5) | |
37 | #define TWL4030_USBFASTMCHG BIT(2) | |
38 | #define TWL4030_STS_VBUS BIT(7) | |
39 | #define TWL4030_STS_USB_ID BIT(2) | |
40 | ||
41 | /* BCI interrupts */ | |
42 | #define TWL4030_WOVF BIT(0) /* Watchdog overflow */ | |
43 | #define TWL4030_TMOVF BIT(1) /* Timer overflow */ | |
44 | #define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */ | |
45 | #define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */ | |
46 | #define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */ | |
47 | #define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */ | |
48 | #define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */ | |
49 | #define TWL4030_BATSTS BIT(7) /* Battery status */ | |
50 | ||
51 | #define TWL4030_VBATLVL BIT(0) /* VBAT level */ | |
52 | #define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */ | |
53 | #define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */ | |
54 | #define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */ | |
55 | ||
56 | #define TWL4030_MSTATEC_USB BIT(4) | |
57 | #define TWL4030_MSTATEC_AC BIT(5) | |
58 | #define TWL4030_MSTATEC_MASK 0x0f | |
59 | #define TWL4030_MSTATEC_QUICK1 0x02 | |
60 | #define TWL4030_MSTATEC_QUICK7 0x07 | |
61 | #define TWL4030_MSTATEC_COMPLETE1 0x0b | |
62 | #define TWL4030_MSTATEC_COMPLETE4 0x0e | |
63 | ||
64 | static bool allow_usb; | |
65 | module_param(allow_usb, bool, 1); | |
66 | MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current"); | |
67 | ||
68 | struct twl4030_bci { | |
69 | struct device *dev; | |
70 | struct power_supply ac; | |
71 | struct power_supply usb; | |
72 | struct otg_transceiver *transceiver; | |
73 | struct notifier_block otg_nb; | |
74 | int irq_chg; | |
75 | int irq_bci; | |
76 | }; | |
77 | ||
78 | /* | |
79 | * clear and set bits on an given register on a given module | |
80 | */ | |
81 | static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg) | |
82 | { | |
83 | u8 val = 0; | |
84 | int ret; | |
85 | ||
86 | ret = twl_i2c_read_u8(mod_no, &val, reg); | |
87 | if (ret) | |
88 | return ret; | |
89 | ||
90 | val &= ~clear; | |
91 | val |= set; | |
92 | ||
93 | return twl_i2c_write_u8(mod_no, val, reg); | |
94 | } | |
95 | ||
96 | static int twl4030_bci_read(u8 reg, u8 *val) | |
97 | { | |
98 | return twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, val, reg); | |
99 | } | |
100 | ||
101 | static int twl4030_clear_set_boot_bci(u8 clear, u8 set) | |
102 | { | |
103 | return twl4030_clear_set(TWL4030_MODULE_PM_MASTER, 0, | |
104 | TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set, | |
105 | TWL4030_PM_MASTER_BOOT_BCI); | |
106 | } | |
107 | ||
108 | static int twl4030bci_read_adc_val(u8 reg) | |
109 | { | |
110 | int ret, temp; | |
111 | u8 val; | |
112 | ||
113 | /* read MSB */ | |
114 | ret = twl4030_bci_read(reg + 1, &val); | |
115 | if (ret) | |
116 | return ret; | |
117 | ||
118 | temp = (int)(val & 0x03) << 8; | |
119 | ||
120 | /* read LSB */ | |
121 | ret = twl4030_bci_read(reg, &val); | |
122 | if (ret) | |
123 | return ret; | |
124 | ||
125 | return temp | val; | |
126 | } | |
127 | ||
128 | /* | |
129 | * Check if VBUS power is present | |
130 | */ | |
131 | static int twl4030_bci_have_vbus(struct twl4030_bci *bci) | |
132 | { | |
133 | int ret; | |
134 | u8 hwsts; | |
135 | ||
136 | ret = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hwsts, | |
137 | TWL4030_PM_MASTER_STS_HW_CONDITIONS); | |
138 | if (ret < 0) | |
139 | return 0; | |
140 | ||
141 | dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts); | |
142 | ||
143 | /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */ | |
144 | if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID)) | |
145 | return 1; | |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
150 | /* | |
151 | * Enable/Disable USB Charge funtionality. | |
152 | */ | |
153 | static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable) | |
154 | { | |
155 | int ret; | |
156 | ||
157 | if (enable) { | |
158 | /* Check for USB charger conneted */ | |
159 | if (!twl4030_bci_have_vbus(bci)) | |
160 | return -ENODEV; | |
161 | ||
162 | /* | |
163 | * Until we can find out what current the device can provide, | |
164 | * require a module param to enable USB charging. | |
165 | */ | |
166 | if (!allow_usb) { | |
167 | dev_warn(bci->dev, "USB charging is disabled.\n"); | |
168 | return -EACCES; | |
169 | } | |
170 | ||
171 | /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */ | |
172 | ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB); | |
173 | if (ret < 0) | |
174 | return ret; | |
175 | ||
176 | /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */ | |
177 | ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE, 0, | |
178 | TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4); | |
179 | } else { | |
180 | ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0); | |
181 | } | |
182 | ||
183 | return ret; | |
184 | } | |
185 | ||
186 | /* | |
187 | * Enable/Disable AC Charge funtionality. | |
188 | */ | |
189 | static int twl4030_charger_enable_ac(bool enable) | |
190 | { | |
191 | int ret; | |
192 | ||
193 | if (enable) | |
194 | ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC); | |
195 | else | |
196 | ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0); | |
197 | ||
198 | return ret; | |
199 | } | |
200 | ||
201 | /* | |
202 | * TWL4030 CHG_PRES (AC charger presence) events | |
203 | */ | |
204 | static irqreturn_t twl4030_charger_interrupt(int irq, void *arg) | |
205 | { | |
206 | struct twl4030_bci *bci = arg; | |
207 | ||
208 | dev_dbg(bci->dev, "CHG_PRES irq\n"); | |
209 | power_supply_changed(&bci->ac); | |
210 | power_supply_changed(&bci->usb); | |
211 | ||
212 | return IRQ_HANDLED; | |
213 | } | |
214 | ||
215 | /* | |
216 | * TWL4030 BCI monitoring events | |
217 | */ | |
218 | static irqreturn_t twl4030_bci_interrupt(int irq, void *arg) | |
219 | { | |
220 | struct twl4030_bci *bci = arg; | |
221 | u8 irqs1, irqs2; | |
222 | int ret; | |
223 | ||
224 | ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1, | |
225 | TWL4030_INTERRUPTS_BCIISR1A); | |
226 | if (ret < 0) | |
227 | return IRQ_HANDLED; | |
228 | ||
229 | ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2, | |
230 | TWL4030_INTERRUPTS_BCIISR2A); | |
231 | if (ret < 0) | |
232 | return IRQ_HANDLED; | |
233 | ||
234 | dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1); | |
235 | ||
236 | if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) { | |
237 | /* charger state change, inform the core */ | |
238 | power_supply_changed(&bci->ac); | |
239 | power_supply_changed(&bci->usb); | |
240 | } | |
241 | ||
242 | /* various monitoring events, for now we just log them here */ | |
243 | if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1)) | |
244 | dev_warn(bci->dev, "battery temperature out of range\n"); | |
245 | ||
246 | if (irqs1 & TWL4030_BATSTS) | |
247 | dev_crit(bci->dev, "battery disconnected\n"); | |
248 | ||
249 | if (irqs2 & TWL4030_VBATOV) | |
250 | dev_crit(bci->dev, "VBAT overvoltage\n"); | |
251 | ||
252 | if (irqs2 & TWL4030_VBUSOV) | |
253 | dev_crit(bci->dev, "VBUS overvoltage\n"); | |
254 | ||
255 | if (irqs2 & TWL4030_ACCHGOV) | |
256 | dev_crit(bci->dev, "Ac charger overvoltage\n"); | |
257 | ||
258 | return IRQ_HANDLED; | |
259 | } | |
260 | ||
261 | static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val, | |
262 | void *priv) | |
263 | { | |
264 | struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, otg_nb); | |
265 | ||
266 | dev_dbg(bci->dev, "OTG notify %lu\n", val); | |
267 | ||
268 | switch (val) { | |
269 | case USB_EVENT_VBUS: | |
270 | case USB_EVENT_CHARGER: | |
271 | twl4030_charger_enable_usb(bci, true); | |
272 | break; | |
273 | case USB_EVENT_NONE: | |
274 | twl4030_charger_enable_usb(bci, false); | |
275 | break; | |
276 | } | |
277 | ||
278 | return NOTIFY_OK; | |
279 | } | |
280 | ||
281 | /* | |
282 | * TI provided formulas: | |
283 | * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85 | |
284 | * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7 | |
285 | * Here we use integer approximation of: | |
286 | * CGAIN == 0: val * 1.6618 - 0.85 | |
287 | * CGAIN == 1: (val * 1.6618 - 0.85) * 2 | |
288 | */ | |
289 | static int twl4030_charger_get_current(void) | |
290 | { | |
291 | int curr; | |
292 | int ret; | |
293 | u8 bcictl1; | |
294 | ||
295 | curr = twl4030bci_read_adc_val(TWL4030_BCIICHG); | |
296 | if (curr < 0) | |
297 | return curr; | |
298 | ||
299 | ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); | |
300 | if (ret) | |
301 | return ret; | |
302 | ||
303 | ret = (curr * 16618 - 850 * 10000) / 10; | |
304 | if (bcictl1 & TWL4030_CGAIN) | |
305 | ret *= 2; | |
306 | ||
307 | return ret; | |
308 | } | |
309 | ||
310 | /* | |
311 | * Returns the main charge FSM state | |
312 | * Or < 0 on failure. | |
313 | */ | |
314 | static int twl4030bci_state(struct twl4030_bci *bci) | |
315 | { | |
316 | int ret; | |
317 | u8 state; | |
318 | ||
319 | ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state); | |
320 | if (ret) { | |
321 | pr_err("twl4030_bci: error reading BCIMSTATEC\n"); | |
322 | return ret; | |
323 | } | |
324 | ||
325 | dev_dbg(bci->dev, "state: %02x\n", state); | |
326 | ||
327 | return state; | |
328 | } | |
329 | ||
330 | static int twl4030_bci_state_to_status(int state) | |
331 | { | |
332 | state &= TWL4030_MSTATEC_MASK; | |
333 | if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7) | |
334 | return POWER_SUPPLY_STATUS_CHARGING; | |
335 | else if (TWL4030_MSTATEC_COMPLETE1 <= state && | |
336 | state <= TWL4030_MSTATEC_COMPLETE4) | |
337 | return POWER_SUPPLY_STATUS_FULL; | |
338 | else | |
339 | return POWER_SUPPLY_STATUS_NOT_CHARGING; | |
340 | } | |
341 | ||
342 | static int twl4030_bci_get_property(struct power_supply *psy, | |
343 | enum power_supply_property psp, | |
344 | union power_supply_propval *val) | |
345 | { | |
346 | struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent); | |
347 | int is_charging; | |
348 | int state; | |
349 | int ret; | |
350 | ||
351 | state = twl4030bci_state(bci); | |
352 | if (state < 0) | |
353 | return state; | |
354 | ||
355 | if (psy->type == POWER_SUPPLY_TYPE_USB) | |
356 | is_charging = state & TWL4030_MSTATEC_USB; | |
357 | else | |
358 | is_charging = state & TWL4030_MSTATEC_AC; | |
359 | ||
360 | switch (psp) { | |
361 | case POWER_SUPPLY_PROP_STATUS: | |
362 | if (is_charging) | |
363 | val->intval = twl4030_bci_state_to_status(state); | |
364 | else | |
365 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
366 | break; | |
367 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
368 | /* charging must be active for meaningful result */ | |
369 | if (!is_charging) | |
370 | return -ENODATA; | |
371 | if (psy->type == POWER_SUPPLY_TYPE_USB) { | |
372 | ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS); | |
373 | if (ret < 0) | |
374 | return ret; | |
375 | /* BCIVBUS uses ADCIN8, 7/1023 V/step */ | |
376 | val->intval = ret * 6843; | |
377 | } else { | |
378 | ret = twl4030bci_read_adc_val(TWL4030_BCIVAC); | |
379 | if (ret < 0) | |
380 | return ret; | |
381 | /* BCIVAC uses ADCIN11, 10/1023 V/step */ | |
382 | val->intval = ret * 9775; | |
383 | } | |
384 | break; | |
385 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
386 | if (!is_charging) | |
387 | return -ENODATA; | |
388 | /* current measurement is shared between AC and USB */ | |
389 | ret = twl4030_charger_get_current(); | |
390 | if (ret < 0) | |
391 | return ret; | |
392 | val->intval = ret; | |
393 | break; | |
394 | case POWER_SUPPLY_PROP_ONLINE: | |
395 | val->intval = is_charging && | |
396 | twl4030_bci_state_to_status(state) != | |
397 | POWER_SUPPLY_STATUS_NOT_CHARGING; | |
398 | break; | |
399 | default: | |
400 | return -EINVAL; | |
401 | } | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
406 | static enum power_supply_property twl4030_charger_props[] = { | |
407 | POWER_SUPPLY_PROP_STATUS, | |
408 | POWER_SUPPLY_PROP_ONLINE, | |
409 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
410 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
411 | }; | |
412 | ||
413 | static int __init twl4030_bci_probe(struct platform_device *pdev) | |
414 | { | |
415 | struct twl4030_bci *bci; | |
416 | int ret; | |
417 | int reg; | |
418 | ||
419 | bci = kzalloc(sizeof(*bci), GFP_KERNEL); | |
420 | if (bci == NULL) | |
421 | return -ENOMEM; | |
422 | ||
423 | bci->dev = &pdev->dev; | |
424 | bci->irq_chg = platform_get_irq(pdev, 0); | |
425 | bci->irq_bci = platform_get_irq(pdev, 1); | |
426 | ||
427 | platform_set_drvdata(pdev, bci); | |
428 | ||
429 | bci->ac.name = "twl4030_ac"; | |
430 | bci->ac.type = POWER_SUPPLY_TYPE_MAINS; | |
431 | bci->ac.properties = twl4030_charger_props; | |
432 | bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props); | |
433 | bci->ac.get_property = twl4030_bci_get_property; | |
434 | ||
435 | ret = power_supply_register(&pdev->dev, &bci->ac); | |
436 | if (ret) { | |
437 | dev_err(&pdev->dev, "failed to register ac: %d\n", ret); | |
438 | goto fail_register_ac; | |
439 | } | |
440 | ||
441 | bci->usb.name = "twl4030_usb"; | |
442 | bci->usb.type = POWER_SUPPLY_TYPE_USB; | |
443 | bci->usb.properties = twl4030_charger_props; | |
444 | bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props); | |
445 | bci->usb.get_property = twl4030_bci_get_property; | |
446 | ||
447 | ret = power_supply_register(&pdev->dev, &bci->usb); | |
448 | if (ret) { | |
449 | dev_err(&pdev->dev, "failed to register usb: %d\n", ret); | |
450 | goto fail_register_usb; | |
451 | } | |
452 | ||
453 | ret = request_threaded_irq(bci->irq_chg, NULL, | |
454 | twl4030_charger_interrupt, 0, pdev->name, bci); | |
455 | if (ret < 0) { | |
456 | dev_err(&pdev->dev, "could not request irq %d, status %d\n", | |
457 | bci->irq_chg, ret); | |
458 | goto fail_chg_irq; | |
459 | } | |
460 | ||
461 | ret = request_threaded_irq(bci->irq_bci, NULL, | |
462 | twl4030_bci_interrupt, 0, pdev->name, bci); | |
463 | if (ret < 0) { | |
464 | dev_err(&pdev->dev, "could not request irq %d, status %d\n", | |
465 | bci->irq_bci, ret); | |
466 | goto fail_bci_irq; | |
467 | } | |
468 | ||
469 | bci->transceiver = otg_get_transceiver(); | |
470 | if (bci->transceiver != NULL) { | |
471 | bci->otg_nb.notifier_call = twl4030_bci_usb_ncb; | |
472 | otg_register_notifier(bci->transceiver, &bci->otg_nb); | |
473 | } | |
474 | ||
475 | /* Enable interrupts now. */ | |
476 | reg = ~(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 | | |
477 | TWL4030_TBATOR1 | TWL4030_BATSTS); | |
478 | ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, | |
479 | TWL4030_INTERRUPTS_BCIIMR1A); | |
480 | if (ret < 0) { | |
481 | dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret); | |
482 | goto fail_unmask_interrupts; | |
483 | } | |
484 | ||
485 | reg = ~(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV); | |
486 | ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, | |
487 | TWL4030_INTERRUPTS_BCIIMR2A); | |
488 | if (ret < 0) | |
489 | dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret); | |
490 | ||
491 | twl4030_charger_enable_ac(true); | |
492 | twl4030_charger_enable_usb(bci, true); | |
493 | ||
494 | return 0; | |
495 | ||
496 | fail_unmask_interrupts: | |
497 | if (bci->transceiver != NULL) { | |
498 | otg_unregister_notifier(bci->transceiver, &bci->otg_nb); | |
499 | otg_put_transceiver(bci->transceiver); | |
500 | } | |
501 | free_irq(bci->irq_bci, bci); | |
502 | fail_bci_irq: | |
503 | free_irq(bci->irq_chg, bci); | |
504 | fail_chg_irq: | |
505 | power_supply_unregister(&bci->usb); | |
506 | fail_register_usb: | |
507 | power_supply_unregister(&bci->ac); | |
508 | fail_register_ac: | |
509 | platform_set_drvdata(pdev, NULL); | |
510 | kfree(bci); | |
511 | ||
512 | return ret; | |
513 | } | |
514 | ||
515 | static int __exit twl4030_bci_remove(struct platform_device *pdev) | |
516 | { | |
517 | struct twl4030_bci *bci = platform_get_drvdata(pdev); | |
518 | ||
519 | twl4030_charger_enable_ac(false); | |
520 | twl4030_charger_enable_usb(bci, false); | |
521 | ||
522 | /* mask interrupts */ | |
523 | twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, | |
524 | TWL4030_INTERRUPTS_BCIIMR1A); | |
525 | twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, | |
526 | TWL4030_INTERRUPTS_BCIIMR2A); | |
527 | ||
528 | if (bci->transceiver != NULL) { | |
529 | otg_unregister_notifier(bci->transceiver, &bci->otg_nb); | |
530 | otg_put_transceiver(bci->transceiver); | |
531 | } | |
532 | free_irq(bci->irq_bci, bci); | |
533 | free_irq(bci->irq_chg, bci); | |
534 | power_supply_unregister(&bci->usb); | |
535 | power_supply_unregister(&bci->ac); | |
536 | platform_set_drvdata(pdev, NULL); | |
537 | kfree(bci); | |
538 | ||
539 | return 0; | |
540 | } | |
541 | ||
542 | static struct platform_driver twl4030_bci_driver = { | |
543 | .driver = { | |
544 | .name = "twl4030_bci", | |
545 | .owner = THIS_MODULE, | |
546 | }, | |
547 | .remove = __exit_p(twl4030_bci_remove), | |
548 | }; | |
549 | ||
550 | static int __init twl4030_bci_init(void) | |
551 | { | |
552 | return platform_driver_probe(&twl4030_bci_driver, twl4030_bci_probe); | |
553 | } | |
554 | module_init(twl4030_bci_init); | |
555 | ||
556 | static void __exit twl4030_bci_exit(void) | |
557 | { | |
558 | platform_driver_unregister(&twl4030_bci_driver); | |
559 | } | |
560 | module_exit(twl4030_bci_exit); | |
561 | ||
562 | MODULE_AUTHOR("Gražydas Ignotas"); | |
563 | MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver"); | |
564 | MODULE_LICENSE("GPL"); | |
565 | MODULE_ALIAS("platform:twl4030_bci"); |