xref: /linux/drivers/leds/leds-pca955x.c (revision ef815d2cba782e96b9aad9483523d474ed41c62a)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2007-2008 Extreme Engineering Solutions, Inc.
4  *
5  * Author: Nate Case <ncase@xes-inc.com>
6  *
7  * LED driver for various PCA955x I2C LED drivers
8  *
9  * Supported devices:
10  *
11  *	Device		Description		7-bit slave address
12  *	------		-----------		-------------------
13  *	PCA9550		2-bit driver		0x60 .. 0x61
14  *	PCA9551		8-bit driver		0x60 .. 0x67
15  *	PCA9552		16-bit driver		0x60 .. 0x67
16  *	PCA9553/01	4-bit driver		0x62
17  *	PCA9553/02	4-bit driver		0x63
18  *
19  * Philips PCA955x LED driver chips follow a register map as shown below:
20  *
21  *	Control Register		Description
22  *	----------------		-----------
23  *	0x0				Input register 0
24  *					..
25  *	NUM_INPUT_REGS - 1		Last Input register X
26  *
27  *	NUM_INPUT_REGS			Frequency prescaler 0
28  *	NUM_INPUT_REGS + 1		PWM register 0
29  *	NUM_INPUT_REGS + 2		Frequency prescaler 1
30  *	NUM_INPUT_REGS + 3		PWM register 1
31  *
32  *	NUM_INPUT_REGS + 4		LED selector 0
33  *	NUM_INPUT_REGS + 4
34  *	    + NUM_LED_REGS - 1		Last LED selector
35  *
36  *  where NUM_INPUT_REGS and NUM_LED_REGS vary depending on how many
37  *  bits the chip supports.
38  */
39 
40 #include <linux/bitops.h>
41 #include <linux/ctype.h>
42 #include <linux/delay.h>
43 #include <linux/err.h>
44 #include <linux/gpio/driver.h>
45 #include <linux/i2c.h>
46 #include <linux/leds.h>
47 #include <linux/module.h>
48 #include <linux/of.h>
49 #include <linux/property.h>
50 #include <linux/slab.h>
51 #include <linux/string.h>
52 
53 #include <dt-bindings/leds/leds-pca955x.h>
54 
55 /* LED select registers determine the source that drives LED outputs */
56 #define PCA955X_LS_LED_ON	0x0	/* Output LOW */
57 #define PCA955X_LS_LED_OFF	0x1	/* Output HI-Z */
58 #define PCA955X_LS_BLINK0	0x2	/* Blink at PWM0 rate */
59 #define PCA955X_LS_BLINK1	0x3	/* Blink at PWM1 rate */
60 
61 #define PCA955X_GPIO_INPUT	LED_OFF
62 #define PCA955X_GPIO_HIGH	LED_OFF
63 #define PCA955X_GPIO_LOW	LED_FULL
64 
65 enum pca955x_type {
66 	pca9550,
67 	pca9551,
68 	pca9552,
69 	ibm_pca9552,
70 	pca9553,
71 };
72 
73 struct pca955x_chipdef {
74 	int			bits;
75 	u8			slv_addr;	/* 7-bit slave address mask */
76 	int			slv_addr_shift;	/* Number of bits to ignore */
77 };
78 
79 static struct pca955x_chipdef pca955x_chipdefs[] = {
80 	[pca9550] = {
81 		.bits		= 2,
82 		.slv_addr	= /* 110000x */ 0x60,
83 		.slv_addr_shift	= 1,
84 	},
85 	[pca9551] = {
86 		.bits		= 8,
87 		.slv_addr	= /* 1100xxx */ 0x60,
88 		.slv_addr_shift	= 3,
89 	},
90 	[pca9552] = {
91 		.bits		= 16,
92 		.slv_addr	= /* 1100xxx */ 0x60,
93 		.slv_addr_shift	= 3,
94 	},
95 	[ibm_pca9552] = {
96 		.bits		= 16,
97 		.slv_addr	= /* 0110xxx */ 0x30,
98 		.slv_addr_shift	= 3,
99 	},
100 	[pca9553] = {
101 		.bits		= 4,
102 		.slv_addr	= /* 110001x */ 0x62,
103 		.slv_addr_shift	= 1,
104 	},
105 };
106 
107 static const struct i2c_device_id pca955x_id[] = {
108 	{ "pca9550", pca9550 },
109 	{ "pca9551", pca9551 },
110 	{ "pca9552", pca9552 },
111 	{ "ibm-pca9552", ibm_pca9552 },
112 	{ "pca9553", pca9553 },
113 	{ }
114 };
115 MODULE_DEVICE_TABLE(i2c, pca955x_id);
116 
117 struct pca955x {
118 	struct mutex lock;
119 	struct pca955x_led *leds;
120 	struct pca955x_chipdef	*chipdef;
121 	struct i2c_client	*client;
122 	unsigned long active_pins;
123 #ifdef CONFIG_LEDS_PCA955X_GPIO
124 	struct gpio_chip gpio;
125 #endif
126 };
127 
128 struct pca955x_led {
129 	struct pca955x	*pca955x;
130 	struct led_classdev	led_cdev;
131 	int			led_num;	/* 0 .. 15 potentially */
132 	u32			type;
133 	enum led_default_state	default_state;
134 	struct fwnode_handle	*fwnode;
135 };
136 
137 struct pca955x_platform_data {
138 	struct pca955x_led	*leds;
139 	int			num_leds;
140 };
141 
142 /* 8 bits per input register */
143 static inline int pca95xx_num_input_regs(int bits)
144 {
145 	return (bits + 7) / 8;
146 }
147 
148 /*
149  * Return an LED selector register value based on an existing one, with
150  * the appropriate 2-bit state value set for the given LED number (0-3).
151  */
152 static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state)
153 {
154 	return (oldval & (~(0x3 << (led_num << 1)))) |
155 		((state & 0x3) << (led_num << 1));
156 }
157 
158 /*
159  * Write to frequency prescaler register, used to program the
160  * period of the PWM output.  period = (PSCx + 1) / 38
161  */
162 static int pca955x_write_psc(struct i2c_client *client, int n, u8 val)
163 {
164 	struct pca955x *pca955x = i2c_get_clientdata(client);
165 	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + (2 * n);
166 	int ret;
167 
168 	ret = i2c_smbus_write_byte_data(client, cmd, val);
169 	if (ret < 0)
170 		dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
171 			__func__, n, val, ret);
172 	return ret;
173 }
174 
175 /*
176  * Write to PWM register, which determines the duty cycle of the
177  * output.  LED is OFF when the count is less than the value of this
178  * register, and ON when it is greater.  If PWMx == 0, LED is always OFF.
179  *
180  * Duty cycle is (256 - PWMx) / 256
181  */
182 static int pca955x_write_pwm(struct i2c_client *client, int n, u8 val)
183 {
184 	struct pca955x *pca955x = i2c_get_clientdata(client);
185 	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
186 	int ret;
187 
188 	ret = i2c_smbus_write_byte_data(client, cmd, val);
189 	if (ret < 0)
190 		dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
191 			__func__, n, val, ret);
192 	return ret;
193 }
194 
195 /*
196  * Write to LED selector register, which determines the source that
197  * drives the LED output.
198  */
199 static int pca955x_write_ls(struct i2c_client *client, int n, u8 val)
200 {
201 	struct pca955x *pca955x = i2c_get_clientdata(client);
202 	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n;
203 	int ret;
204 
205 	ret = i2c_smbus_write_byte_data(client, cmd, val);
206 	if (ret < 0)
207 		dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
208 			__func__, n, val, ret);
209 	return ret;
210 }
211 
212 /*
213  * Read the LED selector register, which determines the source that
214  * drives the LED output.
215  */
216 static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val)
217 {
218 	struct pca955x *pca955x = i2c_get_clientdata(client);
219 	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n;
220 	int ret;
221 
222 	ret = i2c_smbus_read_byte_data(client, cmd);
223 	if (ret < 0) {
224 		dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
225 			__func__, n, ret);
226 		return ret;
227 	}
228 	*val = (u8)ret;
229 	return 0;
230 }
231 
232 static int pca955x_read_pwm(struct i2c_client *client, int n, u8 *val)
233 {
234 	struct pca955x *pca955x = i2c_get_clientdata(client);
235 	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
236 	int ret;
237 
238 	ret = i2c_smbus_read_byte_data(client, cmd);
239 	if (ret < 0) {
240 		dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
241 			__func__, n, ret);
242 		return ret;
243 	}
244 	*val = (u8)ret;
245 	return 0;
246 }
247 
248 static enum led_brightness pca955x_led_get(struct led_classdev *led_cdev)
249 {
250 	struct pca955x_led *pca955x_led = container_of(led_cdev,
251 						       struct pca955x_led,
252 						       led_cdev);
253 	struct pca955x *pca955x = pca955x_led->pca955x;
254 	u8 ls, pwm;
255 	int ret;
256 
257 	ret = pca955x_read_ls(pca955x->client, pca955x_led->led_num / 4, &ls);
258 	if (ret)
259 		return ret;
260 
261 	ls = (ls >> ((pca955x_led->led_num % 4) << 1)) & 0x3;
262 	switch (ls) {
263 	case PCA955X_LS_LED_ON:
264 		ret = LED_FULL;
265 		break;
266 	case PCA955X_LS_LED_OFF:
267 		ret = LED_OFF;
268 		break;
269 	case PCA955X_LS_BLINK0:
270 		ret = LED_HALF;
271 		break;
272 	case PCA955X_LS_BLINK1:
273 		ret = pca955x_read_pwm(pca955x->client, 1, &pwm);
274 		if (ret)
275 			return ret;
276 		ret = 255 - pwm;
277 		break;
278 	}
279 
280 	return ret;
281 }
282 
283 static int pca955x_led_set(struct led_classdev *led_cdev,
284 			    enum led_brightness value)
285 {
286 	struct pca955x_led *pca955x_led;
287 	struct pca955x *pca955x;
288 	u8 ls;
289 	int chip_ls;	/* which LSx to use (0-3 potentially) */
290 	int ls_led;	/* which set of bits within LSx to use (0-3) */
291 	int ret;
292 
293 	pca955x_led = container_of(led_cdev, struct pca955x_led, led_cdev);
294 	pca955x = pca955x_led->pca955x;
295 
296 	chip_ls = pca955x_led->led_num / 4;
297 	ls_led = pca955x_led->led_num % 4;
298 
299 	mutex_lock(&pca955x->lock);
300 
301 	ret = pca955x_read_ls(pca955x->client, chip_ls, &ls);
302 	if (ret)
303 		goto out;
304 
305 	switch (value) {
306 	case LED_FULL:
307 		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_ON);
308 		break;
309 	case LED_OFF:
310 		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_OFF);
311 		break;
312 	case LED_HALF:
313 		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK0);
314 		break;
315 	default:
316 		/*
317 		 * Use PWM1 for all other values.  This has the unwanted
318 		 * side effect of making all LEDs on the chip share the
319 		 * same brightness level if set to a value other than
320 		 * OFF, HALF, or FULL.  But, this is probably better than
321 		 * just turning off for all other values.
322 		 */
323 		ret = pca955x_write_pwm(pca955x->client, 1, 255 - value);
324 		if (ret)
325 			goto out;
326 		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK1);
327 		break;
328 	}
329 
330 	ret = pca955x_write_ls(pca955x->client, chip_ls, ls);
331 
332 out:
333 	mutex_unlock(&pca955x->lock);
334 
335 	return ret;
336 }
337 
338 #ifdef CONFIG_LEDS_PCA955X_GPIO
339 /*
340  * Read the INPUT register, which contains the state of LEDs.
341  */
342 static int pca955x_read_input(struct i2c_client *client, int n, u8 *val)
343 {
344 	int ret = i2c_smbus_read_byte_data(client, n);
345 
346 	if (ret < 0) {
347 		dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
348 			__func__, n, ret);
349 		return ret;
350 	}
351 	*val = (u8)ret;
352 	return 0;
353 
354 }
355 
356 static int pca955x_gpio_request_pin(struct gpio_chip *gc, unsigned int offset)
357 {
358 	struct pca955x *pca955x = gpiochip_get_data(gc);
359 
360 	return test_and_set_bit(offset, &pca955x->active_pins) ? -EBUSY : 0;
361 }
362 
363 static void pca955x_gpio_free_pin(struct gpio_chip *gc, unsigned int offset)
364 {
365 	struct pca955x *pca955x = gpiochip_get_data(gc);
366 
367 	clear_bit(offset, &pca955x->active_pins);
368 }
369 
370 static int pca955x_set_value(struct gpio_chip *gc, unsigned int offset,
371 			     int val)
372 {
373 	struct pca955x *pca955x = gpiochip_get_data(gc);
374 	struct pca955x_led *led = &pca955x->leds[offset];
375 
376 	if (val)
377 		return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_HIGH);
378 
379 	return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_LOW);
380 }
381 
382 static void pca955x_gpio_set_value(struct gpio_chip *gc, unsigned int offset,
383 				   int val)
384 {
385 	pca955x_set_value(gc, offset, val);
386 }
387 
388 static int pca955x_gpio_get_value(struct gpio_chip *gc, unsigned int offset)
389 {
390 	struct pca955x *pca955x = gpiochip_get_data(gc);
391 	struct pca955x_led *led = &pca955x->leds[offset];
392 	u8 reg = 0;
393 
394 	/* There is nothing we can do about errors */
395 	pca955x_read_input(pca955x->client, led->led_num / 8, &reg);
396 
397 	return !!(reg & (1 << (led->led_num % 8)));
398 }
399 
400 static int pca955x_gpio_direction_input(struct gpio_chip *gc,
401 					unsigned int offset)
402 {
403 	struct pca955x *pca955x = gpiochip_get_data(gc);
404 	struct pca955x_led *led = &pca955x->leds[offset];
405 
406 	/* To use as input ensure pin is not driven. */
407 	return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_INPUT);
408 }
409 
410 static int pca955x_gpio_direction_output(struct gpio_chip *gc,
411 					 unsigned int offset, int val)
412 {
413 	return pca955x_set_value(gc, offset, val);
414 }
415 #endif /* CONFIG_LEDS_PCA955X_GPIO */
416 
417 static struct pca955x_platform_data *
418 pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip)
419 {
420 	struct pca955x_platform_data *pdata;
421 	struct pca955x_led *led;
422 	struct fwnode_handle *child;
423 	int count;
424 
425 	count = device_get_child_node_count(&client->dev);
426 	if (count > chip->bits)
427 		return ERR_PTR(-ENODEV);
428 
429 	pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
430 	if (!pdata)
431 		return ERR_PTR(-ENOMEM);
432 
433 	pdata->leds = devm_kcalloc(&client->dev,
434 				   chip->bits, sizeof(struct pca955x_led),
435 				   GFP_KERNEL);
436 	if (!pdata->leds)
437 		return ERR_PTR(-ENOMEM);
438 
439 	device_for_each_child_node(&client->dev, child) {
440 		u32 reg;
441 		int res;
442 
443 		res = fwnode_property_read_u32(child, "reg", &reg);
444 		if ((res != 0) || (reg >= chip->bits))
445 			continue;
446 
447 		led = &pdata->leds[reg];
448 		led->type = PCA955X_TYPE_LED;
449 		led->fwnode = child;
450 		led->default_state = led_init_default_state_get(child);
451 
452 		fwnode_property_read_u32(child, "type", &led->type);
453 	}
454 
455 	pdata->num_leds = chip->bits;
456 
457 	return pdata;
458 }
459 
460 static const struct of_device_id of_pca955x_match[] = {
461 	{ .compatible = "nxp,pca9550", .data = (void *)pca9550 },
462 	{ .compatible = "nxp,pca9551", .data = (void *)pca9551 },
463 	{ .compatible = "nxp,pca9552", .data = (void *)pca9552 },
464 	{ .compatible = "ibm,pca9552", .data = (void *)ibm_pca9552 },
465 	{ .compatible = "nxp,pca9553", .data = (void *)pca9553 },
466 	{},
467 };
468 MODULE_DEVICE_TABLE(of, of_pca955x_match);
469 
470 static int pca955x_probe(struct i2c_client *client)
471 {
472 	struct pca955x *pca955x;
473 	struct pca955x_led *pca955x_led;
474 	struct pca955x_chipdef *chip;
475 	struct led_classdev *led;
476 	struct led_init_data init_data;
477 	struct i2c_adapter *adapter;
478 	int i, err;
479 	struct pca955x_platform_data *pdata;
480 	bool set_default_label = false;
481 	bool keep_pwm = false;
482 	char default_label[8];
483 	enum pca955x_type chip_type;
484 	const void *md = device_get_match_data(&client->dev);
485 
486 	if (md) {
487 		chip_type = (enum pca955x_type)md;
488 	} else {
489 		const struct i2c_device_id *id = i2c_match_id(pca955x_id,
490 							      client);
491 
492 		if (id) {
493 			chip_type = (enum pca955x_type)id->driver_data;
494 		} else {
495 			dev_err(&client->dev, "unknown chip\n");
496 			return -ENODEV;
497 		}
498 	}
499 
500 	chip = &pca955x_chipdefs[chip_type];
501 	adapter = client->adapter;
502 	pdata = dev_get_platdata(&client->dev);
503 	if (!pdata) {
504 		pdata =	pca955x_get_pdata(client, chip);
505 		if (IS_ERR(pdata))
506 			return PTR_ERR(pdata);
507 	}
508 
509 	/* Make sure the slave address / chip type combo given is possible */
510 	if ((client->addr & ~((1 << chip->slv_addr_shift) - 1)) !=
511 	    chip->slv_addr) {
512 		dev_err(&client->dev, "invalid slave address %02x\n",
513 			client->addr);
514 		return -ENODEV;
515 	}
516 
517 	dev_info(&client->dev, "leds-pca955x: Using %s %d-bit LED driver at "
518 		 "slave address 0x%02x\n", client->name, chip->bits,
519 		 client->addr);
520 
521 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
522 		return -EIO;
523 
524 	if (pdata->num_leds != chip->bits) {
525 		dev_err(&client->dev,
526 			"board info claims %d LEDs on a %d-bit chip\n",
527 			pdata->num_leds, chip->bits);
528 		return -ENODEV;
529 	}
530 
531 	pca955x = devm_kzalloc(&client->dev, sizeof(*pca955x), GFP_KERNEL);
532 	if (!pca955x)
533 		return -ENOMEM;
534 
535 	pca955x->leds = devm_kcalloc(&client->dev, chip->bits,
536 				     sizeof(*pca955x_led), GFP_KERNEL);
537 	if (!pca955x->leds)
538 		return -ENOMEM;
539 
540 	i2c_set_clientdata(client, pca955x);
541 
542 	mutex_init(&pca955x->lock);
543 	pca955x->client = client;
544 	pca955x->chipdef = chip;
545 
546 	init_data.devname_mandatory = false;
547 	init_data.devicename = "pca955x";
548 
549 	for (i = 0; i < chip->bits; i++) {
550 		pca955x_led = &pca955x->leds[i];
551 		pca955x_led->led_num = i;
552 		pca955x_led->pca955x = pca955x;
553 		pca955x_led->type = pdata->leds[i].type;
554 
555 		switch (pca955x_led->type) {
556 		case PCA955X_TYPE_NONE:
557 		case PCA955X_TYPE_GPIO:
558 			break;
559 		case PCA955X_TYPE_LED:
560 			led = &pca955x_led->led_cdev;
561 			led->brightness_set_blocking = pca955x_led_set;
562 			led->brightness_get = pca955x_led_get;
563 
564 			if (pdata->leds[i].default_state == LEDS_DEFSTATE_OFF) {
565 				err = pca955x_led_set(led, LED_OFF);
566 				if (err)
567 					return err;
568 			} else if (pdata->leds[i].default_state == LEDS_DEFSTATE_ON) {
569 				err = pca955x_led_set(led, LED_FULL);
570 				if (err)
571 					return err;
572 			}
573 
574 			init_data.fwnode = pdata->leds[i].fwnode;
575 
576 			if (is_of_node(init_data.fwnode)) {
577 				if (to_of_node(init_data.fwnode)->name[0] ==
578 				    '\0')
579 					set_default_label = true;
580 				else
581 					set_default_label = false;
582 			} else {
583 				set_default_label = true;
584 			}
585 
586 			if (set_default_label) {
587 				snprintf(default_label, sizeof(default_label),
588 					 "%d", i);
589 				init_data.default_label = default_label;
590 			} else {
591 				init_data.default_label = NULL;
592 			}
593 
594 			err = devm_led_classdev_register_ext(&client->dev, led,
595 							     &init_data);
596 			if (err)
597 				return err;
598 
599 			set_bit(i, &pca955x->active_pins);
600 
601 			/*
602 			 * For default-state == "keep", let the core update the
603 			 * brightness from the hardware, then check the
604 			 * brightness to see if it's using PWM1. If so, PWM1
605 			 * should not be written below.
606 			 */
607 			if (pdata->leds[i].default_state == LEDS_DEFSTATE_KEEP) {
608 				if (led->brightness != LED_FULL &&
609 				    led->brightness != LED_OFF &&
610 				    led->brightness != LED_HALF)
611 					keep_pwm = true;
612 			}
613 		}
614 	}
615 
616 	/* PWM0 is used for half brightness or 50% duty cycle */
617 	err = pca955x_write_pwm(client, 0, 255 - LED_HALF);
618 	if (err)
619 		return err;
620 
621 	if (!keep_pwm) {
622 		/* PWM1 is used for variable brightness, default to OFF */
623 		err = pca955x_write_pwm(client, 1, 0);
624 		if (err)
625 			return err;
626 	}
627 
628 	/* Set to fast frequency so we do not see flashing */
629 	err = pca955x_write_psc(client, 0, 0);
630 	if (err)
631 		return err;
632 	err = pca955x_write_psc(client, 1, 0);
633 	if (err)
634 		return err;
635 
636 #ifdef CONFIG_LEDS_PCA955X_GPIO
637 	pca955x->gpio.label = "gpio-pca955x";
638 	pca955x->gpio.direction_input = pca955x_gpio_direction_input;
639 	pca955x->gpio.direction_output = pca955x_gpio_direction_output;
640 	pca955x->gpio.set = pca955x_gpio_set_value;
641 	pca955x->gpio.get = pca955x_gpio_get_value;
642 	pca955x->gpio.request = pca955x_gpio_request_pin;
643 	pca955x->gpio.free = pca955x_gpio_free_pin;
644 	pca955x->gpio.can_sleep = 1;
645 	pca955x->gpio.base = -1;
646 	pca955x->gpio.ngpio = chip->bits;
647 	pca955x->gpio.parent = &client->dev;
648 	pca955x->gpio.owner = THIS_MODULE;
649 
650 	err = devm_gpiochip_add_data(&client->dev, &pca955x->gpio,
651 				     pca955x);
652 	if (err) {
653 		/* Use data->gpio.dev as a flag for freeing gpiochip */
654 		pca955x->gpio.parent = NULL;
655 		dev_warn(&client->dev, "could not add gpiochip\n");
656 		return err;
657 	}
658 	dev_info(&client->dev, "gpios %i...%i\n",
659 		 pca955x->gpio.base, pca955x->gpio.base +
660 		 pca955x->gpio.ngpio - 1);
661 #endif
662 
663 	return 0;
664 }
665 
666 static struct i2c_driver pca955x_driver = {
667 	.driver = {
668 		.name	= "leds-pca955x",
669 		.of_match_table = of_pca955x_match,
670 	},
671 	.probe = pca955x_probe,
672 	.id_table = pca955x_id,
673 };
674 
675 module_i2c_driver(pca955x_driver);
676 
677 MODULE_AUTHOR("Nate Case <ncase@xes-inc.com>");
678 MODULE_DESCRIPTION("PCA955x LED driver");
679 MODULE_LICENSE("GPL v2");
680