xref: /openbmc/linux/drivers/mfd/tps65010.c (revision 0d727e18)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * tps65010 - driver for tps6501x power management chips
4  *
5  * Copyright (C) 2004 Texas Instruments
6  * Copyright (C) 2004-2005 David Brownell
7  */
8 
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/slab.h>
13 #include <linux/interrupt.h>
14 #include <linux/i2c.h>
15 #include <linux/delay.h>
16 #include <linux/workqueue.h>
17 #include <linux/debugfs.h>
18 #include <linux/seq_file.h>
19 #include <linux/mutex.h>
20 #include <linux/platform_device.h>
21 
22 #include <linux/mfd/tps65010.h>
23 
24 #include <linux/gpio/driver.h>
25 
26 
27 /*-------------------------------------------------------------------------*/
28 
29 #define	DRIVER_VERSION	"2 May 2005"
30 #define	DRIVER_NAME	(tps65010_driver.driver.name)
31 
32 MODULE_DESCRIPTION("TPS6501x Power Management Driver");
33 MODULE_LICENSE("GPL");
34 
35 static struct i2c_driver tps65010_driver;
36 
37 /*-------------------------------------------------------------------------*/
38 
39 /* This driver handles a family of multipurpose chips, which incorporate
40  * voltage regulators, lithium ion/polymer battery charging, GPIOs, LEDs,
41  * and other features often needed in portable devices like cell phones
42  * or digital cameras.
43  *
44  * The tps65011 and tps65013 have different voltage settings compared
45  * to tps65010 and tps65012.  The tps65013 has a NO_CHG status/irq.
46  * All except tps65010 have "wait" mode, possibly defaulted so that
47  * battery-insert != device-on.
48  *
49  * We could distinguish between some models by checking VDCDC1.UVLO or
50  * other registers, unless they've been changed already after powerup
51  * as part of board setup by a bootloader.
52  */
53 enum tps_model {
54 	TPS65010,
55 	TPS65011,
56 	TPS65012,
57 	TPS65013,
58 };
59 
60 struct tps65010 {
61 	struct i2c_client	*client;
62 	struct mutex		lock;
63 	struct delayed_work	work;
64 	struct dentry		*file;
65 	unsigned		charging:1;
66 	unsigned		por:1;
67 	unsigned		model:8;
68 	u16			vbus;
69 	unsigned long		flags;
70 #define	FLAG_VBUS_CHANGED	0
71 #define	FLAG_IRQ_ENABLE		1
72 
73 	/* copies of last register state */
74 	u8			chgstatus, regstatus, chgconf;
75 	u8			nmask1, nmask2;
76 
77 	u8			outmask;
78 	struct gpio_chip	chip;
79 	struct platform_device	*leds;
80 };
81 
82 #define	POWER_POLL_DELAY	msecs_to_jiffies(5000)
83 
84 /*-------------------------------------------------------------------------*/
85 
86 #if	defined(DEBUG) || defined(CONFIG_DEBUG_FS)
87 
88 static void dbg_chgstat(char *buf, size_t len, u8 chgstatus)
89 {
90 	snprintf(buf, len, "%02x%s%s%s%s%s%s%s%s\n",
91 		chgstatus,
92 		(chgstatus & TPS_CHG_USB) ? " USB" : "",
93 		(chgstatus & TPS_CHG_AC) ? " AC" : "",
94 		(chgstatus & TPS_CHG_THERM) ? " therm" : "",
95 		(chgstatus & TPS_CHG_TERM) ? " done" :
96 			((chgstatus & (TPS_CHG_USB|TPS_CHG_AC))
97 				? " (charging)" : ""),
98 		(chgstatus & TPS_CHG_TAPER_TMO) ? " taper_tmo" : "",
99 		(chgstatus & TPS_CHG_CHG_TMO) ? " charge_tmo" : "",
100 		(chgstatus & TPS_CHG_PRECHG_TMO) ? " prechg_tmo" : "",
101 		(chgstatus & TPS_CHG_TEMP_ERR) ? " temp_err" : "");
102 }
103 
104 static void dbg_regstat(char *buf, size_t len, u8 regstatus)
105 {
106 	snprintf(buf, len, "%02x %s%s%s%s%s%s%s%s\n",
107 		regstatus,
108 		(regstatus & TPS_REG_ONOFF) ? "off" : "(on)",
109 		(regstatus & TPS_REG_COVER) ? " uncover" : "",
110 		(regstatus & TPS_REG_UVLO) ? " UVLO" : "",
111 		(regstatus & TPS_REG_NO_CHG) ? " NO_CHG" : "",
112 		(regstatus & TPS_REG_PG_LD02) ? " ld02_bad" : "",
113 		(regstatus & TPS_REG_PG_LD01) ? " ld01_bad" : "",
114 		(regstatus & TPS_REG_PG_MAIN) ? " main_bad" : "",
115 		(regstatus & TPS_REG_PG_CORE) ? " core_bad" : "");
116 }
117 
118 static void dbg_chgconf(int por, char *buf, size_t len, u8 chgconfig)
119 {
120 	const char *hibit;
121 
122 	if (por)
123 		hibit = (chgconfig & TPS_CHARGE_POR)
124 				? "POR=69ms" : "POR=1sec";
125 	else
126 		hibit = (chgconfig & TPS65013_AUA) ? "AUA" : "";
127 
128 	snprintf(buf, len, "%02x %s%s%s AC=%d%% USB=%dmA %sCharge\n",
129 		chgconfig, hibit,
130 		(chgconfig & TPS_CHARGE_RESET) ? " reset" : "",
131 		(chgconfig & TPS_CHARGE_FAST) ? " fast" : "",
132 		({int p; switch ((chgconfig >> 3) & 3) {
133 		case 3:		p = 100; break;
134 		case 2:		p = 75; break;
135 		case 1:		p = 50; break;
136 		default:	p = 25; break;
137 		}; p; }),
138 		(chgconfig & TPS_VBUS_CHARGING)
139 			? ((chgconfig & TPS_VBUS_500MA) ? 500 : 100)
140 			: 0,
141 		(chgconfig & TPS_CHARGE_ENABLE) ? "" : "No");
142 }
143 
144 #endif
145 
146 #ifdef	DEBUG
147 
148 static void show_chgstatus(const char *label, u8 chgstatus)
149 {
150 	char buf [100];
151 
152 	dbg_chgstat(buf, sizeof buf, chgstatus);
153 	pr_debug("%s: %s %s", DRIVER_NAME, label, buf);
154 }
155 
156 static void show_regstatus(const char *label, u8 regstatus)
157 {
158 	char buf [100];
159 
160 	dbg_regstat(buf, sizeof buf, regstatus);
161 	pr_debug("%s: %s %s", DRIVER_NAME, label, buf);
162 }
163 
164 static void show_chgconfig(int por, const char *label, u8 chgconfig)
165 {
166 	char buf [100];
167 
168 	dbg_chgconf(por, buf, sizeof buf, chgconfig);
169 	pr_debug("%s: %s %s", DRIVER_NAME, label, buf);
170 }
171 
172 #else
173 
174 static inline void show_chgstatus(const char *label, u8 chgstatus) { }
175 static inline void show_regstatus(const char *label, u8 chgstatus) { }
176 static inline void show_chgconfig(int por, const char *label, u8 chgconfig) { }
177 
178 #endif
179 
180 #ifdef	CONFIG_DEBUG_FS
181 
182 static int dbg_show(struct seq_file *s, void *_)
183 {
184 	struct tps65010	*tps = s->private;
185 	u8		value, v2;
186 	unsigned	i;
187 	char		buf[100];
188 	const char	*chip;
189 
190 	switch (tps->model) {
191 	case TPS65010:	chip = "tps65010"; break;
192 	case TPS65011:	chip = "tps65011"; break;
193 	case TPS65012:	chip = "tps65012"; break;
194 	case TPS65013:	chip = "tps65013"; break;
195 	default:	chip = NULL; break;
196 	}
197 	seq_printf(s, "driver  %s\nversion %s\nchip    %s\n\n",
198 			DRIVER_NAME, DRIVER_VERSION, chip);
199 
200 	mutex_lock(&tps->lock);
201 
202 	/* FIXME how can we tell whether a battery is present?
203 	 * likely involves a charge gauging chip (like BQ26501).
204 	 */
205 
206 	seq_printf(s, "%scharging\n\n", tps->charging ? "" : "(not) ");
207 
208 
209 	/* registers for monitoring battery charging and status; note
210 	 * that reading chgstat and regstat may ack IRQs...
211 	 */
212 	value = i2c_smbus_read_byte_data(tps->client, TPS_CHGCONFIG);
213 	dbg_chgconf(tps->por, buf, sizeof buf, value);
214 	seq_printf(s, "chgconfig %s", buf);
215 
216 	value = i2c_smbus_read_byte_data(tps->client, TPS_CHGSTATUS);
217 	dbg_chgstat(buf, sizeof buf, value);
218 	seq_printf(s, "chgstat   %s", buf);
219 	value = i2c_smbus_read_byte_data(tps->client, TPS_MASK1);
220 	dbg_chgstat(buf, sizeof buf, value);
221 	seq_printf(s, "mask1     %s", buf);
222 	/* ignore ackint1 */
223 
224 	value = i2c_smbus_read_byte_data(tps->client, TPS_REGSTATUS);
225 	dbg_regstat(buf, sizeof buf, value);
226 	seq_printf(s, "regstat   %s", buf);
227 	value = i2c_smbus_read_byte_data(tps->client, TPS_MASK2);
228 	dbg_regstat(buf, sizeof buf, value);
229 	seq_printf(s, "mask2     %s\n", buf);
230 	/* ignore ackint2 */
231 
232 	queue_delayed_work(system_power_efficient_wq, &tps->work,
233 			   POWER_POLL_DELAY);
234 
235 	/* VMAIN voltage, enable lowpower, etc */
236 	value = i2c_smbus_read_byte_data(tps->client, TPS_VDCDC1);
237 	seq_printf(s, "vdcdc1    %02x\n", value);
238 
239 	/* VCORE voltage, vibrator on/off */
240 	value = i2c_smbus_read_byte_data(tps->client, TPS_VDCDC2);
241 	seq_printf(s, "vdcdc2    %02x\n", value);
242 
243 	/* both LD0s, and their lowpower behavior */
244 	value = i2c_smbus_read_byte_data(tps->client, TPS_VREGS1);
245 	seq_printf(s, "vregs1    %02x\n\n", value);
246 
247 
248 	/* LEDs and GPIOs */
249 	value = i2c_smbus_read_byte_data(tps->client, TPS_LED1_ON);
250 	v2 = i2c_smbus_read_byte_data(tps->client, TPS_LED1_PER);
251 	seq_printf(s, "led1 %s, on=%02x, per=%02x, %d/%d msec\n",
252 		(value & 0x80)
253 			? ((v2 & 0x80) ? "on" : "off")
254 			: ((v2 & 0x80) ? "blink" : "(nPG)"),
255 		value, v2,
256 		(value & 0x7f) * 10, (v2 & 0x7f) * 100);
257 
258 	value = i2c_smbus_read_byte_data(tps->client, TPS_LED2_ON);
259 	v2 = i2c_smbus_read_byte_data(tps->client, TPS_LED2_PER);
260 	seq_printf(s, "led2 %s, on=%02x, per=%02x, %d/%d msec\n",
261 		(value & 0x80)
262 			? ((v2 & 0x80) ? "on" : "off")
263 			: ((v2 & 0x80) ? "blink" : "off"),
264 		value, v2,
265 		(value & 0x7f) * 10, (v2 & 0x7f) * 100);
266 
267 	value = i2c_smbus_read_byte_data(tps->client, TPS_DEFGPIO);
268 	v2 = i2c_smbus_read_byte_data(tps->client, TPS_MASK3);
269 	seq_printf(s, "defgpio %02x mask3 %02x\n", value, v2);
270 
271 	for (i = 0; i < 4; i++) {
272 		if (value & (1 << (4 + i)))
273 			seq_printf(s, "  gpio%d-out %s\n", i + 1,
274 				(value & (1 << i)) ? "low" : "hi ");
275 		else
276 			seq_printf(s, "  gpio%d-in  %s %s %s\n", i + 1,
277 				(value & (1 << i)) ? "hi " : "low",
278 				(v2 & (1 << i)) ? "no-irq" : "irq",
279 				(v2 & (1 << (4 + i))) ? "rising" : "falling");
280 	}
281 
282 	mutex_unlock(&tps->lock);
283 	return 0;
284 }
285 
286 static int dbg_tps_open(struct inode *inode, struct file *file)
287 {
288 	return single_open(file, dbg_show, inode->i_private);
289 }
290 
291 static const struct file_operations debug_fops = {
292 	.open		= dbg_tps_open,
293 	.read		= seq_read,
294 	.llseek		= seq_lseek,
295 	.release	= single_release,
296 };
297 
298 #define	DEBUG_FOPS	&debug_fops
299 
300 #else
301 #define	DEBUG_FOPS	NULL
302 #endif
303 
304 /*-------------------------------------------------------------------------*/
305 
306 /* handle IRQS in a task context, so we can use I2C calls */
307 static void tps65010_interrupt(struct tps65010 *tps)
308 {
309 	u8 tmp = 0, mask, poll;
310 
311 	/* IRQs won't trigger for certain events, but we can get
312 	 * others by polling (normally, with external power applied).
313 	 */
314 	poll = 0;
315 
316 	/* regstatus irqs */
317 	if (tps->nmask2) {
318 		tmp = i2c_smbus_read_byte_data(tps->client, TPS_REGSTATUS);
319 		mask = tmp ^ tps->regstatus;
320 		tps->regstatus = tmp;
321 		mask &= tps->nmask2;
322 	} else
323 		mask = 0;
324 	if (mask) {
325 		tps->regstatus =  tmp;
326 		/* may need to shut something down ... */
327 
328 		/* "off" usually means deep sleep */
329 		if (tmp & TPS_REG_ONOFF) {
330 			pr_info("%s: power off button\n", DRIVER_NAME);
331 #if 0
332 			/* REVISIT:  this might need its own workqueue
333 			 * plus tweaks including deadlock avoidance ...
334 			 * also needs to get error handling and probably
335 			 * an #ifdef CONFIG_HIBERNATION
336 			 */
337 			hibernate();
338 #endif
339 			poll = 1;
340 		}
341 	}
342 
343 	/* chgstatus irqs */
344 	if (tps->nmask1) {
345 		tmp = i2c_smbus_read_byte_data(tps->client, TPS_CHGSTATUS);
346 		mask = tmp ^ tps->chgstatus;
347 		tps->chgstatus = tmp;
348 		mask &= tps->nmask1;
349 	} else
350 		mask = 0;
351 	if (mask) {
352 		unsigned	charging = 0;
353 
354 		show_chgstatus("chg/irq", tmp);
355 		if (tmp & (TPS_CHG_USB|TPS_CHG_AC))
356 			show_chgconfig(tps->por, "conf", tps->chgconf);
357 
358 		/* Unless it was turned off or disabled, we charge any
359 		 * battery whenever there's power available for it
360 		 * and the charger hasn't been disabled.
361 		 */
362 		if (!(tps->chgstatus & ~(TPS_CHG_USB|TPS_CHG_AC))
363 				&& (tps->chgstatus & (TPS_CHG_USB|TPS_CHG_AC))
364 				&& (tps->chgconf & TPS_CHARGE_ENABLE)
365 				) {
366 			if (tps->chgstatus & TPS_CHG_USB) {
367 				/* VBUS options are readonly until reconnect */
368 				if (mask & TPS_CHG_USB)
369 					set_bit(FLAG_VBUS_CHANGED, &tps->flags);
370 				charging = 1;
371 			} else if (tps->chgstatus & TPS_CHG_AC)
372 				charging = 1;
373 		}
374 		if (charging != tps->charging) {
375 			tps->charging = charging;
376 			pr_info("%s: battery %scharging\n",
377 				DRIVER_NAME, charging ? "" :
378 				((tps->chgstatus & (TPS_CHG_USB|TPS_CHG_AC))
379 					? "NOT " : "dis"));
380 		}
381 	}
382 
383 	/* always poll to detect (a) power removal, without tps65013
384 	 * NO_CHG IRQ; or (b) restart of charging after stop.
385 	 */
386 	if ((tps->model != TPS65013 || !tps->charging)
387 			&& (tps->chgstatus & (TPS_CHG_USB|TPS_CHG_AC)))
388 		poll = 1;
389 	if (poll)
390 		queue_delayed_work(system_power_efficient_wq, &tps->work,
391 				   POWER_POLL_DELAY);
392 
393 	/* also potentially gpio-in rise or fall */
394 }
395 
396 /* handle IRQs and polling using keventd for now */
397 static void tps65010_work(struct work_struct *work)
398 {
399 	struct tps65010		*tps;
400 
401 	tps = container_of(to_delayed_work(work), struct tps65010, work);
402 	mutex_lock(&tps->lock);
403 
404 	tps65010_interrupt(tps);
405 
406 	if (test_and_clear_bit(FLAG_VBUS_CHANGED, &tps->flags)) {
407 		u8	chgconfig, tmp;
408 
409 		chgconfig = i2c_smbus_read_byte_data(tps->client,
410 					TPS_CHGCONFIG);
411 		chgconfig &= ~(TPS_VBUS_500MA | TPS_VBUS_CHARGING);
412 		if (tps->vbus == 500)
413 			chgconfig |= TPS_VBUS_500MA | TPS_VBUS_CHARGING;
414 		else if (tps->vbus >= 100)
415 			chgconfig |= TPS_VBUS_CHARGING;
416 
417 		i2c_smbus_write_byte_data(tps->client,
418 					  TPS_CHGCONFIG, chgconfig);
419 
420 		/* vbus update fails unless VBUS is connected! */
421 		tmp = i2c_smbus_read_byte_data(tps->client, TPS_CHGCONFIG);
422 		tps->chgconf = tmp;
423 		show_chgconfig(tps->por, "update vbus", tmp);
424 	}
425 
426 	if (test_and_clear_bit(FLAG_IRQ_ENABLE, &tps->flags))
427 		enable_irq(tps->client->irq);
428 
429 	mutex_unlock(&tps->lock);
430 }
431 
432 static irqreturn_t tps65010_irq(int irq, void *_tps)
433 {
434 	struct tps65010		*tps = _tps;
435 
436 	disable_irq_nosync(irq);
437 	set_bit(FLAG_IRQ_ENABLE, &tps->flags);
438 	queue_delayed_work(system_power_efficient_wq, &tps->work, 0);
439 	return IRQ_HANDLED;
440 }
441 
442 /*-------------------------------------------------------------------------*/
443 
444 /* offsets 0..3 == GPIO1..GPIO4
445  * offsets 4..5 == LED1/nPG, LED2 (we set one of the non-BLINK modes)
446  * offset 6 == vibrator motor driver
447  */
448 static void
449 tps65010_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
450 {
451 	if (offset < 4)
452 		tps65010_set_gpio_out_value(offset + 1, value);
453 	else if (offset < 6)
454 		tps65010_set_led(offset - 3, value ? ON : OFF);
455 	else
456 		tps65010_set_vib(value);
457 }
458 
459 static int
460 tps65010_output(struct gpio_chip *chip, unsigned offset, int value)
461 {
462 	/* GPIOs may be input-only */
463 	if (offset < 4) {
464 		struct tps65010		*tps;
465 
466 		tps = gpiochip_get_data(chip);
467 		if (!(tps->outmask & (1 << offset)))
468 			return -EINVAL;
469 		tps65010_set_gpio_out_value(offset + 1, value);
470 	} else if (offset < 6)
471 		tps65010_set_led(offset - 3, value ? ON : OFF);
472 	else
473 		tps65010_set_vib(value);
474 
475 	return 0;
476 }
477 
478 static int tps65010_gpio_get(struct gpio_chip *chip, unsigned offset)
479 {
480 	int			value;
481 	struct tps65010		*tps;
482 
483 	tps = gpiochip_get_data(chip);
484 
485 	if (offset < 4) {
486 		value = i2c_smbus_read_byte_data(tps->client, TPS_DEFGPIO);
487 		if (value < 0)
488 			return value;
489 		if (value & (1 << (offset + 4)))	/* output */
490 			return !(value & (1 << offset));
491 		else					/* input */
492 			return !!(value & (1 << offset));
493 	}
494 
495 	/* REVISIT we *could* report LED1/nPG and LED2 state ... */
496 	return 0;
497 }
498 
499 
500 /*-------------------------------------------------------------------------*/
501 
502 static struct tps65010 *the_tps;
503 
504 static void tps65010_remove(struct i2c_client *client)
505 {
506 	struct tps65010		*tps = i2c_get_clientdata(client);
507 	struct tps65010_board	*board = dev_get_platdata(&client->dev);
508 
509 	if (board && board->teardown) {
510 		int status = board->teardown(client, board->context);
511 		if (status < 0)
512 			dev_dbg(&client->dev, "board %s %s err %d\n",
513 				"teardown", client->name, status);
514 	}
515 	if (client->irq > 0)
516 		free_irq(client->irq, tps);
517 	cancel_delayed_work_sync(&tps->work);
518 	debugfs_remove(tps->file);
519 	the_tps = NULL;
520 }
521 
522 static int tps65010_probe(struct i2c_client *client)
523 {
524 	const struct i2c_device_id *id = i2c_client_get_device_id(client);
525 	struct tps65010		*tps;
526 	int			status;
527 	struct tps65010_board	*board = dev_get_platdata(&client->dev);
528 
529 	if (the_tps) {
530 		dev_dbg(&client->dev, "only one tps6501x chip allowed\n");
531 		return -ENODEV;
532 	}
533 
534 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
535 		return -EINVAL;
536 
537 	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
538 	if (!tps)
539 		return -ENOMEM;
540 
541 	mutex_init(&tps->lock);
542 	INIT_DELAYED_WORK(&tps->work, tps65010_work);
543 	tps->client = client;
544 	tps->model = id->driver_data;
545 
546 	/* the IRQ is active low, but many gpio lines can't support that
547 	 * so this driver uses falling-edge triggers instead.
548 	 */
549 	if (client->irq > 0) {
550 		status = request_irq(client->irq, tps65010_irq,
551 				     IRQF_TRIGGER_FALLING, DRIVER_NAME, tps);
552 		if (status < 0) {
553 			dev_dbg(&client->dev, "can't get IRQ %d, err %d\n",
554 					client->irq, status);
555 			return status;
556 		}
557 		/* annoying race here, ideally we'd have an option
558 		 * to claim the irq now and enable it later.
559 		 * FIXME genirq IRQF_NOAUTOEN now solves that ...
560 		 */
561 		disable_irq(client->irq);
562 		set_bit(FLAG_IRQ_ENABLE, &tps->flags);
563 	} else
564 		dev_warn(&client->dev, "IRQ not configured!\n");
565 
566 
567 	switch (tps->model) {
568 	case TPS65010:
569 	case TPS65012:
570 		tps->por = 1;
571 		break;
572 	/* else CHGCONFIG.POR is replaced by AUA, enabling a WAIT mode */
573 	}
574 	tps->chgconf = i2c_smbus_read_byte_data(client, TPS_CHGCONFIG);
575 	show_chgconfig(tps->por, "conf/init", tps->chgconf);
576 
577 	show_chgstatus("chg/init",
578 		i2c_smbus_read_byte_data(client, TPS_CHGSTATUS));
579 	show_regstatus("reg/init",
580 		i2c_smbus_read_byte_data(client, TPS_REGSTATUS));
581 
582 	pr_debug("%s: vdcdc1 0x%02x, vdcdc2 %02x, vregs1 %02x\n", DRIVER_NAME,
583 		i2c_smbus_read_byte_data(client, TPS_VDCDC1),
584 		i2c_smbus_read_byte_data(client, TPS_VDCDC2),
585 		i2c_smbus_read_byte_data(client, TPS_VREGS1));
586 	pr_debug("%s: defgpio 0x%02x, mask3 0x%02x\n", DRIVER_NAME,
587 		i2c_smbus_read_byte_data(client, TPS_DEFGPIO),
588 		i2c_smbus_read_byte_data(client, TPS_MASK3));
589 
590 	i2c_set_clientdata(client, tps);
591 	the_tps = tps;
592 
593 #if	defined(CONFIG_USB_GADGET) && !defined(CONFIG_USB_OTG)
594 	/* USB hosts can't draw VBUS.  OTG devices could, later
595 	 * when OTG infrastructure enables it.  USB peripherals
596 	 * could be relying on VBUS while booting, though.
597 	 */
598 	tps->vbus = 100;
599 #endif
600 
601 	/* unmask the "interesting" irqs, then poll once to
602 	 * kickstart monitoring, initialize shadowed status
603 	 * registers, and maybe disable VBUS draw.
604 	 */
605 	tps->nmask1 = ~0;
606 	(void) i2c_smbus_write_byte_data(client, TPS_MASK1, ~tps->nmask1);
607 
608 	tps->nmask2 = TPS_REG_ONOFF;
609 	if (tps->model == TPS65013)
610 		tps->nmask2 |= TPS_REG_NO_CHG;
611 	(void) i2c_smbus_write_byte_data(client, TPS_MASK2, ~tps->nmask2);
612 
613 	(void) i2c_smbus_write_byte_data(client, TPS_MASK3, 0x0f
614 		| i2c_smbus_read_byte_data(client, TPS_MASK3));
615 
616 	tps65010_work(&tps->work.work);
617 
618 	tps->file = debugfs_create_file(DRIVER_NAME, S_IRUGO, NULL,
619 				tps, DEBUG_FOPS);
620 
621 	/* optionally register GPIOs */
622 	if (board && board->base != 0) {
623 		tps->outmask = board->outmask;
624 
625 		tps->chip.label = client->name;
626 		tps->chip.parent = &client->dev;
627 		tps->chip.owner = THIS_MODULE;
628 
629 		tps->chip.set = tps65010_gpio_set;
630 		tps->chip.direction_output = tps65010_output;
631 
632 		/* NOTE:  only partial support for inputs; nyet IRQs */
633 		tps->chip.get = tps65010_gpio_get;
634 
635 		tps->chip.base = board->base;
636 		tps->chip.ngpio = 7;
637 		tps->chip.can_sleep = 1;
638 
639 		status = gpiochip_add_data(&tps->chip, tps);
640 		if (status < 0)
641 			dev_err(&client->dev, "can't add gpiochip, err %d\n",
642 					status);
643 		else if (board->setup) {
644 			status = board->setup(client, board->context);
645 			if (status < 0) {
646 				dev_dbg(&client->dev,
647 					"board %s %s err %d\n",
648 					"setup", client->name, status);
649 				status = 0;
650 			}
651 		}
652 	}
653 
654 	return 0;
655 }
656 
657 static const struct i2c_device_id tps65010_id[] = {
658 	{ "tps65010", TPS65010 },
659 	{ "tps65011", TPS65011 },
660 	{ "tps65012", TPS65012 },
661 	{ "tps65013", TPS65013 },
662 	{ "tps65014", TPS65011 },	/* tps65011 charging at 6.5V max */
663 	{ }
664 };
665 MODULE_DEVICE_TABLE(i2c, tps65010_id);
666 
667 static struct i2c_driver tps65010_driver = {
668 	.driver = {
669 		.name	= "tps65010",
670 	},
671 	.probe_new = tps65010_probe,
672 	.remove	= tps65010_remove,
673 	.id_table = tps65010_id,
674 };
675 
676 /*-------------------------------------------------------------------------*/
677 
678 /* Draw from VBUS:
679  *   0 mA -- DON'T DRAW (might supply power instead)
680  * 100 mA -- usb unit load (slowest charge rate)
681  * 500 mA -- usb high power (fast battery charge)
682  */
683 int tps65010_set_vbus_draw(unsigned mA)
684 {
685 	unsigned long	flags;
686 
687 	if (!the_tps)
688 		return -ENODEV;
689 
690 	/* assumes non-SMP */
691 	local_irq_save(flags);
692 	if (mA >= 500)
693 		mA = 500;
694 	else if (mA >= 100)
695 		mA = 100;
696 	else
697 		mA = 0;
698 	the_tps->vbus = mA;
699 	if ((the_tps->chgstatus & TPS_CHG_USB)
700 			&& test_and_set_bit(
701 				FLAG_VBUS_CHANGED, &the_tps->flags)) {
702 		/* gadget drivers call this in_irq() */
703 		queue_delayed_work(system_power_efficient_wq, &the_tps->work,
704 				   0);
705 	}
706 	local_irq_restore(flags);
707 
708 	return 0;
709 }
710 EXPORT_SYMBOL(tps65010_set_vbus_draw);
711 
712 /*-------------------------------------------------------------------------*/
713 /* tps65010_set_gpio_out_value parameter:
714  * gpio:  GPIO1, GPIO2, GPIO3 or GPIO4
715  * value: LOW or HIGH
716  */
717 int tps65010_set_gpio_out_value(unsigned gpio, unsigned value)
718 {
719 	int	 status;
720 	unsigned defgpio;
721 
722 	if (!the_tps)
723 		return -ENODEV;
724 	if ((gpio < GPIO1) || (gpio > GPIO4))
725 		return -EINVAL;
726 
727 	mutex_lock(&the_tps->lock);
728 
729 	defgpio = i2c_smbus_read_byte_data(the_tps->client, TPS_DEFGPIO);
730 
731 	/* Configure GPIO for output */
732 	defgpio |= 1 << (gpio + 3);
733 
734 	/* Writing 1 forces a logic 0 on that GPIO and vice versa */
735 	switch (value) {
736 	case LOW:
737 		defgpio |= 1 << (gpio - 1);    /* set GPIO low by writing 1 */
738 		break;
739 	/* case HIGH: */
740 	default:
741 		defgpio &= ~(1 << (gpio - 1)); /* set GPIO high by writing 0 */
742 		break;
743 	}
744 
745 	status = i2c_smbus_write_byte_data(the_tps->client,
746 		TPS_DEFGPIO, defgpio);
747 
748 	pr_debug("%s: gpio%dout = %s, defgpio 0x%02x\n", DRIVER_NAME,
749 		gpio, value ? "high" : "low",
750 		i2c_smbus_read_byte_data(the_tps->client, TPS_DEFGPIO));
751 
752 	mutex_unlock(&the_tps->lock);
753 	return status;
754 }
755 EXPORT_SYMBOL(tps65010_set_gpio_out_value);
756 
757 /*-------------------------------------------------------------------------*/
758 /* tps65010_set_led parameter:
759  * led:  LED1 or LED2
760  * mode: ON, OFF or BLINK
761  */
762 int tps65010_set_led(unsigned led, unsigned mode)
763 {
764 	int	 status;
765 	unsigned led_on, led_per, offs;
766 
767 	if (!the_tps)
768 		return -ENODEV;
769 
770 	if (led == LED1)
771 		offs = 0;
772 	else {
773 		offs = 2;
774 		led = LED2;
775 	}
776 
777 	mutex_lock(&the_tps->lock);
778 
779 	pr_debug("%s: led%i_on   0x%02x\n", DRIVER_NAME, led,
780 		i2c_smbus_read_byte_data(the_tps->client,
781 				TPS_LED1_ON + offs));
782 
783 	pr_debug("%s: led%i_per  0x%02x\n", DRIVER_NAME, led,
784 		i2c_smbus_read_byte_data(the_tps->client,
785 				TPS_LED1_PER + offs));
786 
787 	switch (mode) {
788 	case OFF:
789 		led_on  = 1 << 7;
790 		led_per = 0 << 7;
791 		break;
792 	case ON:
793 		led_on  = 1 << 7;
794 		led_per = 1 << 7;
795 		break;
796 	case BLINK:
797 		led_on  = 0x30 | (0 << 7);
798 		led_per = 0x08 | (1 << 7);
799 		break;
800 	default:
801 		printk(KERN_ERR "%s: Wrong mode parameter for set_led()\n",
802 		       DRIVER_NAME);
803 		mutex_unlock(&the_tps->lock);
804 		return -EINVAL;
805 	}
806 
807 	status = i2c_smbus_write_byte_data(the_tps->client,
808 			TPS_LED1_ON + offs, led_on);
809 
810 	if (status != 0) {
811 		printk(KERN_ERR "%s: Failed to write led%i_on register\n",
812 		       DRIVER_NAME, led);
813 		mutex_unlock(&the_tps->lock);
814 		return status;
815 	}
816 
817 	pr_debug("%s: led%i_on   0x%02x\n", DRIVER_NAME, led,
818 		i2c_smbus_read_byte_data(the_tps->client, TPS_LED1_ON + offs));
819 
820 	status = i2c_smbus_write_byte_data(the_tps->client,
821 			TPS_LED1_PER + offs, led_per);
822 
823 	if (status != 0) {
824 		printk(KERN_ERR "%s: Failed to write led%i_per register\n",
825 		       DRIVER_NAME, led);
826 		mutex_unlock(&the_tps->lock);
827 		return status;
828 	}
829 
830 	pr_debug("%s: led%i_per  0x%02x\n", DRIVER_NAME, led,
831 		i2c_smbus_read_byte_data(the_tps->client,
832 				TPS_LED1_PER + offs));
833 
834 	mutex_unlock(&the_tps->lock);
835 
836 	return status;
837 }
838 EXPORT_SYMBOL(tps65010_set_led);
839 
840 /*-------------------------------------------------------------------------*/
841 /* tps65010_set_vib parameter:
842  * value: ON or OFF
843  */
844 int tps65010_set_vib(unsigned value)
845 {
846 	int	 status;
847 	unsigned vdcdc2;
848 
849 	if (!the_tps)
850 		return -ENODEV;
851 
852 	mutex_lock(&the_tps->lock);
853 
854 	vdcdc2 = i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC2);
855 	vdcdc2 &= ~(1 << 1);
856 	if (value)
857 		vdcdc2 |= (1 << 1);
858 	status = i2c_smbus_write_byte_data(the_tps->client,
859 		TPS_VDCDC2, vdcdc2);
860 
861 	pr_debug("%s: vibrator %s\n", DRIVER_NAME, value ? "on" : "off");
862 
863 	mutex_unlock(&the_tps->lock);
864 	return status;
865 }
866 EXPORT_SYMBOL(tps65010_set_vib);
867 
868 /*-------------------------------------------------------------------------*/
869 /* tps65010_set_low_pwr parameter:
870  * mode: ON or OFF
871  */
872 int tps65010_set_low_pwr(unsigned mode)
873 {
874 	int	 status;
875 	unsigned vdcdc1;
876 
877 	if (!the_tps)
878 		return -ENODEV;
879 
880 	mutex_lock(&the_tps->lock);
881 
882 	pr_debug("%s: %s low_pwr, vdcdc1 0x%02x\n", DRIVER_NAME,
883 		mode ? "enable" : "disable",
884 		i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC1));
885 
886 	vdcdc1 = i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC1);
887 
888 	switch (mode) {
889 	case OFF:
890 		vdcdc1 &= ~TPS_ENABLE_LP; /* disable ENABLE_LP bit */
891 		break;
892 	/* case ON: */
893 	default:
894 		vdcdc1 |= TPS_ENABLE_LP;  /* enable ENABLE_LP bit */
895 		break;
896 	}
897 
898 	status = i2c_smbus_write_byte_data(the_tps->client,
899 			TPS_VDCDC1, vdcdc1);
900 
901 	if (status != 0)
902 		printk(KERN_ERR "%s: Failed to write vdcdc1 register\n",
903 			DRIVER_NAME);
904 	else
905 		pr_debug("%s: vdcdc1 0x%02x\n", DRIVER_NAME,
906 			i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC1));
907 
908 	mutex_unlock(&the_tps->lock);
909 
910 	return status;
911 }
912 EXPORT_SYMBOL(tps65010_set_low_pwr);
913 
914 /*-------------------------------------------------------------------------*/
915 /* tps65010_config_vregs1 parameter:
916  * value to be written to VREGS1 register
917  * Note: The complete register is written, set all bits you need
918  */
919 int tps65010_config_vregs1(unsigned value)
920 {
921 	int	 status;
922 
923 	if (!the_tps)
924 		return -ENODEV;
925 
926 	mutex_lock(&the_tps->lock);
927 
928 	pr_debug("%s: vregs1 0x%02x\n", DRIVER_NAME,
929 			i2c_smbus_read_byte_data(the_tps->client, TPS_VREGS1));
930 
931 	status = i2c_smbus_write_byte_data(the_tps->client,
932 			TPS_VREGS1, value);
933 
934 	if (status != 0)
935 		printk(KERN_ERR "%s: Failed to write vregs1 register\n",
936 			DRIVER_NAME);
937 	else
938 		pr_debug("%s: vregs1 0x%02x\n", DRIVER_NAME,
939 			i2c_smbus_read_byte_data(the_tps->client, TPS_VREGS1));
940 
941 	mutex_unlock(&the_tps->lock);
942 
943 	return status;
944 }
945 EXPORT_SYMBOL(tps65010_config_vregs1);
946 
947 int tps65010_config_vdcdc2(unsigned value)
948 {
949 	struct i2c_client *c;
950 	int	 status;
951 
952 	if (!the_tps)
953 		return -ENODEV;
954 
955 	c = the_tps->client;
956 	mutex_lock(&the_tps->lock);
957 
958 	pr_debug("%s: vdcdc2 0x%02x\n", DRIVER_NAME,
959 		 i2c_smbus_read_byte_data(c, TPS_VDCDC2));
960 
961 	status = i2c_smbus_write_byte_data(c, TPS_VDCDC2, value);
962 
963 	if (status != 0)
964 		printk(KERN_ERR "%s: Failed to write vdcdc2 register\n",
965 			DRIVER_NAME);
966 	else
967 		pr_debug("%s: vregs1 0x%02x\n", DRIVER_NAME,
968 			 i2c_smbus_read_byte_data(c, TPS_VDCDC2));
969 
970 	mutex_unlock(&the_tps->lock);
971 	return status;
972 }
973 EXPORT_SYMBOL(tps65010_config_vdcdc2);
974 
975 /*-------------------------------------------------------------------------*/
976 /* tps65013_set_low_pwr parameter:
977  * mode: ON or OFF
978  */
979 
980 /* FIXME: Assumes AC or USB power is present. Setting AUA bit is not
981 	required if power supply is through a battery */
982 
983 int tps65013_set_low_pwr(unsigned mode)
984 {
985 	int	 status;
986 	unsigned vdcdc1, chgconfig;
987 
988 	if (!the_tps || the_tps->por)
989 		return -ENODEV;
990 
991 	mutex_lock(&the_tps->lock);
992 
993 	pr_debug("%s: %s low_pwr, chgconfig 0x%02x vdcdc1 0x%02x\n",
994 		DRIVER_NAME,
995 		mode ? "enable" : "disable",
996 		i2c_smbus_read_byte_data(the_tps->client, TPS_CHGCONFIG),
997 		i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC1));
998 
999 	chgconfig = i2c_smbus_read_byte_data(the_tps->client, TPS_CHGCONFIG);
1000 	vdcdc1 = i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC1);
1001 
1002 	switch (mode) {
1003 	case OFF:
1004 		chgconfig &= ~TPS65013_AUA; /* disable AUA bit */
1005 		vdcdc1 &= ~TPS_ENABLE_LP; /* disable ENABLE_LP bit */
1006 		break;
1007 	/* case ON: */
1008 	default:
1009 		chgconfig |= TPS65013_AUA;  /* enable AUA bit */
1010 		vdcdc1 |= TPS_ENABLE_LP;  /* enable ENABLE_LP bit */
1011 		break;
1012 	}
1013 
1014 	status = i2c_smbus_write_byte_data(the_tps->client,
1015 			TPS_CHGCONFIG, chgconfig);
1016 	if (status != 0) {
1017 		printk(KERN_ERR "%s: Failed to write chconfig register\n",
1018 	 DRIVER_NAME);
1019 		mutex_unlock(&the_tps->lock);
1020 		return status;
1021 	}
1022 
1023 	chgconfig = i2c_smbus_read_byte_data(the_tps->client, TPS_CHGCONFIG);
1024 	the_tps->chgconf = chgconfig;
1025 	show_chgconfig(0, "chgconf", chgconfig);
1026 
1027 	status = i2c_smbus_write_byte_data(the_tps->client,
1028 			TPS_VDCDC1, vdcdc1);
1029 
1030 	if (status != 0)
1031 		printk(KERN_ERR "%s: Failed to write vdcdc1 register\n",
1032 	 DRIVER_NAME);
1033 	else
1034 		pr_debug("%s: vdcdc1 0x%02x\n", DRIVER_NAME,
1035 			i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC1));
1036 
1037 	mutex_unlock(&the_tps->lock);
1038 
1039 	return status;
1040 }
1041 EXPORT_SYMBOL(tps65013_set_low_pwr);
1042 
1043 /*-------------------------------------------------------------------------*/
1044 
1045 static int __init tps_init(void)
1046 {
1047 	return i2c_add_driver(&tps65010_driver);
1048 }
1049 /* NOTE:  this MUST be initialized before the other parts of the system
1050  * that rely on it ... but after the i2c bus on which this relies.
1051  * That is, much earlier than on PC-type systems, which don't often use
1052  * I2C as a core system bus.
1053  */
1054 subsys_initcall(tps_init);
1055 
1056 static void __exit tps_exit(void)
1057 {
1058 	i2c_del_driver(&tps65010_driver);
1059 }
1060 module_exit(tps_exit);
1061 
1062