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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/drivers/leds/leds-netxbig.c
....@@ -1,23 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * leds-netxbig.c - Driver for the 2Big and 5Big Network series LEDs
34  *
45  * Copyright (C) 2010 LaCie
56  *
67  * Author: Simon Guinot <sguinot@lacie.com>
7
- *
8
- * This program is free software; you can redistribute it and/or modify
9
- * it under the terms of the GNU General Public License as published by
10
- * the Free Software Foundation; either version 2 of the License, or
11
- * (at your option) any later version.
12
- *
13
- * This program is distributed in the hope that it will be useful,
14
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16
- * GNU General Public License for more details.
17
- *
18
- * You should have received a copy of the GNU General Public License
19
- * along with this program; if not, write to the Free Software
20
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
218  */
229 
2310 #include <linux/module.h>
....@@ -25,10 +12,52 @@
2512 #include <linux/slab.h>
2613 #include <linux/spinlock.h>
2714 #include <linux/platform_device.h>
28
-#include <linux/gpio.h>
29
-#include <linux/of_gpio.h>
15
+#include <linux/gpio/consumer.h>
3016 #include <linux/leds.h>
31
-#include <linux/platform_data/leds-kirkwood-netxbig.h>
17
+#include <linux/of.h>
18
+#include <linux/of_platform.h>
19
+
20
+struct netxbig_gpio_ext {
21
+	struct gpio_desc **addr;
22
+	int		num_addr;
23
+	struct gpio_desc **data;
24
+	int		num_data;
25
+	struct gpio_desc *enable;
26
+};
27
+
28
+enum netxbig_led_mode {
29
+	NETXBIG_LED_OFF,
30
+	NETXBIG_LED_ON,
31
+	NETXBIG_LED_SATA,
32
+	NETXBIG_LED_TIMER1,
33
+	NETXBIG_LED_TIMER2,
34
+	NETXBIG_LED_MODE_NUM,
35
+};
36
+
37
+#define NETXBIG_LED_INVALID_MODE NETXBIG_LED_MODE_NUM
38
+
39
+struct netxbig_led_timer {
40
+	unsigned long		delay_on;
41
+	unsigned long		delay_off;
42
+	enum netxbig_led_mode	mode;
43
+};
44
+
45
+struct netxbig_led {
46
+	const char	*name;
47
+	const char	*default_trigger;
48
+	int		mode_addr;
49
+	int		*mode_val;
50
+	int		bright_addr;
51
+	int		bright_max;
52
+};
53
+
54
+struct netxbig_led_platform_data {
55
+	struct netxbig_gpio_ext	*gpio_ext;
56
+	struct netxbig_led_timer *timer;
57
+	int			num_timer;
58
+	struct netxbig_led	*leds;
59
+	int			num_leds;
60
+};
3261 
3362 /*
3463  * GPIO extension bus.
....@@ -41,7 +70,7 @@
4170 	int pin;
4271 
4372 	for (pin = 0; pin < gpio_ext->num_addr; pin++)
44
-		gpio_set_value(gpio_ext->addr[pin], (addr >> pin) & 1);
73
+		gpiod_set_value(gpio_ext->addr[pin], (addr >> pin) & 1);
4574 }
4675 
4776 static void gpio_ext_set_data(struct netxbig_gpio_ext *gpio_ext, int data)
....@@ -49,14 +78,14 @@
4978 	int pin;
5079 
5180 	for (pin = 0; pin < gpio_ext->num_data; pin++)
52
-		gpio_set_value(gpio_ext->data[pin], (data >> pin) & 1);
81
+		gpiod_set_value(gpio_ext->data[pin], (data >> pin) & 1);
5382 }
5483 
5584 static void gpio_ext_enable_select(struct netxbig_gpio_ext *gpio_ext)
5685 {
5786 	/* Enable select is done on the raising edge. */
58
-	gpio_set_value(gpio_ext->enable, 0);
59
-	gpio_set_value(gpio_ext->enable, 1);
87
+	gpiod_set_value(gpio_ext->enable, 0);
88
+	gpiod_set_value(gpio_ext->enable, 1);
6089 }
6190 
6291 static void gpio_ext_set_value(struct netxbig_gpio_ext *gpio_ext,
....@@ -69,41 +98,6 @@
6998 	gpio_ext_set_data(gpio_ext, value);
7099 	gpio_ext_enable_select(gpio_ext);
71100 	spin_unlock_irqrestore(&gpio_ext_lock, flags);
72
-}
73
-
74
-static int gpio_ext_init(struct platform_device *pdev,
75
-			 struct netxbig_gpio_ext *gpio_ext)
76
-{
77
-	int err;
78
-	int i;
79
-
80
-	if (unlikely(!gpio_ext))
81
-		return -EINVAL;
82
-
83
-	/* Configure address GPIOs. */
84
-	for (i = 0; i < gpio_ext->num_addr; i++) {
85
-		err = devm_gpio_request_one(&pdev->dev, gpio_ext->addr[i],
86
-					    GPIOF_OUT_INIT_LOW,
87
-					    "GPIO extension addr");
88
-		if (err)
89
-			return err;
90
-	}
91
-	/* Configure data GPIOs. */
92
-	for (i = 0; i < gpio_ext->num_data; i++) {
93
-		err = devm_gpio_request_one(&pdev->dev, gpio_ext->data[i],
94
-					    GPIOF_OUT_INIT_LOW,
95
-					    "GPIO extension data");
96
-		if (err)
97
-			return err;
98
-	}
99
-	/* Configure "enable select" GPIO. */
100
-	err = devm_gpio_request_one(&pdev->dev, gpio_ext->enable,
101
-				    GPIOF_OUT_INIT_LOW,
102
-				    "GPIO extension enable");
103
-	if (err)
104
-		return err;
105
-
106
-	return 0;
107101 }
108102 
109103 /*
....@@ -319,16 +313,47 @@
319313 	return devm_led_classdev_register(&pdev->dev, &led_dat->cdev);
320314 }
321315 
322
-#ifdef CONFIG_OF_GPIO
323
-static int gpio_ext_get_of_pdata(struct device *dev, struct device_node *np,
324
-				 struct netxbig_gpio_ext *gpio_ext)
316
+/**
317
+ * netxbig_gpio_ext_remove() - Clean up GPIO extension data
318
+ * @data: managed resource data to clean up
319
+ *
320
+ * Since we pick GPIO descriptors from another device than the device our
321
+ * driver is probing to, we need to register a specific callback to free
322
+ * these up using managed resources.
323
+ */
324
+static void netxbig_gpio_ext_remove(void *data)
325325 {
326
-	int *addr, *data;
326
+	struct netxbig_gpio_ext *gpio_ext = data;
327
+	int i;
328
+
329
+	for (i = 0; i < gpio_ext->num_addr; i++)
330
+		gpiod_put(gpio_ext->addr[i]);
331
+	for (i = 0; i < gpio_ext->num_data; i++)
332
+		gpiod_put(gpio_ext->data[i]);
333
+	gpiod_put(gpio_ext->enable);
334
+}
335
+
336
+/**
337
+ * netxbig_gpio_ext_get() - Obtain GPIO extension device data
338
+ * @dev: main LED device
339
+ * @gpio_ext_dev: the GPIO extension device
340
+ * @gpio_ext: the data structure holding the GPIO extension data
341
+ *
342
+ * This function walks the subdevice that only contain GPIO line
343
+ * handles in the device tree and obtains the GPIO descriptors from that
344
+ * device.
345
+ */
346
+static int netxbig_gpio_ext_get(struct device *dev,
347
+				struct device *gpio_ext_dev,
348
+				struct netxbig_gpio_ext *gpio_ext)
349
+{
350
+	struct gpio_desc **addr, **data;
327351 	int num_addr, num_data;
352
+	struct gpio_desc *gpiod;
328353 	int ret;
329354 	int i;
330355 
331
-	ret = of_gpio_named_count(np, "addr-gpios");
356
+	ret = gpiod_count(gpio_ext_dev, "addr");
332357 	if (ret < 0) {
333358 		dev_err(dev,
334359 			"Failed to count GPIOs in DT property addr-gpios\n");
....@@ -339,16 +364,25 @@
339364 	if (!addr)
340365 		return -ENOMEM;
341366 
367
+	/*
368
+	 * We cannot use devm_ managed resources with these GPIO descriptors
369
+	 * since they are associated with the "GPIO extension device" which
370
+	 * does not probe any driver. The device tree parser will however
371
+	 * populate a platform device for it so we can anyway obtain the
372
+	 * GPIO descriptors from the device.
373
+	 */
342374 	for (i = 0; i < num_addr; i++) {
343
-		ret = of_get_named_gpio(np, "addr-gpios", i);
344
-		if (ret < 0)
345
-			return ret;
346
-		addr[i] = ret;
375
+		gpiod = gpiod_get_index(gpio_ext_dev, "addr", i,
376
+					GPIOD_OUT_LOW);
377
+		if (IS_ERR(gpiod))
378
+			return PTR_ERR(gpiod);
379
+		gpiod_set_consumer_name(gpiod, "GPIO extension addr");
380
+		addr[i] = gpiod;
347381 	}
348382 	gpio_ext->addr = addr;
349383 	gpio_ext->num_addr = num_addr;
350384 
351
-	ret = of_gpio_named_count(np, "data-gpios");
385
+	ret = gpiod_count(gpio_ext_dev, "data");
352386 	if (ret < 0) {
353387 		dev_err(dev,
354388 			"Failed to count GPIOs in DT property data-gpios\n");
....@@ -360,30 +394,35 @@
360394 		return -ENOMEM;
361395 
362396 	for (i = 0; i < num_data; i++) {
363
-		ret = of_get_named_gpio(np, "data-gpios", i);
364
-		if (ret < 0)
365
-			return ret;
366
-		data[i] = ret;
397
+		gpiod = gpiod_get_index(gpio_ext_dev, "data", i,
398
+					GPIOD_OUT_LOW);
399
+		if (IS_ERR(gpiod))
400
+			return PTR_ERR(gpiod);
401
+		gpiod_set_consumer_name(gpiod, "GPIO extension data");
402
+		data[i] = gpiod;
367403 	}
368404 	gpio_ext->data = data;
369405 	gpio_ext->num_data = num_data;
370406 
371
-	ret = of_get_named_gpio(np, "enable-gpio", 0);
372
-	if (ret < 0) {
407
+	gpiod = gpiod_get(gpio_ext_dev, "enable", GPIOD_OUT_LOW);
408
+	if (IS_ERR(gpiod)) {
373409 		dev_err(dev,
374410 			"Failed to get GPIO from DT property enable-gpio\n");
375
-		return ret;
411
+		return PTR_ERR(gpiod);
376412 	}
377
-	gpio_ext->enable = ret;
413
+	gpiod_set_consumer_name(gpiod, "GPIO extension enable");
414
+	gpio_ext->enable = gpiod;
378415 
379
-	return 0;
416
+	return devm_add_action_or_reset(dev, netxbig_gpio_ext_remove, gpio_ext);
380417 }
381418 
382419 static int netxbig_leds_get_of_pdata(struct device *dev,
383420 				     struct netxbig_led_platform_data *pdata)
384421 {
385
-	struct device_node *np = dev->of_node;
422
+	struct device_node *np = dev_of_node(dev);
386423 	struct device_node *gpio_ext_np;
424
+	struct platform_device *gpio_ext_pdev;
425
+	struct device *gpio_ext_dev;
387426 	struct device_node *child;
388427 	struct netxbig_gpio_ext *gpio_ext;
389428 	struct netxbig_led_timer *timers;
....@@ -399,33 +438,49 @@
399438 		dev_err(dev, "Failed to get DT handle gpio-ext\n");
400439 		return -EINVAL;
401440 	}
441
+	gpio_ext_pdev = of_find_device_by_node(gpio_ext_np);
442
+	if (!gpio_ext_pdev) {
443
+		dev_err(dev, "Failed to find platform device for gpio-ext\n");
444
+		return -ENODEV;
445
+	}
446
+	gpio_ext_dev = &gpio_ext_pdev->dev;
402447 
403448 	gpio_ext = devm_kzalloc(dev, sizeof(*gpio_ext), GFP_KERNEL);
404
-	if (!gpio_ext)
405
-		return -ENOMEM;
406
-	ret = gpio_ext_get_of_pdata(dev, gpio_ext_np, gpio_ext);
407
-	if (ret)
408
-		return ret;
449
+	if (!gpio_ext) {
450
+		of_node_put(gpio_ext_np);
451
+		ret = -ENOMEM;
452
+		goto put_device;
453
+	}
454
+	ret = netxbig_gpio_ext_get(dev, gpio_ext_dev, gpio_ext);
409455 	of_node_put(gpio_ext_np);
456
+	if (ret)
457
+		goto put_device;
410458 	pdata->gpio_ext = gpio_ext;
411459 
412460 	/* Timers (optional) */
413461 	ret = of_property_count_u32_elems(np, "timers");
414462 	if (ret > 0) {
415
-		if (ret % 3)
416
-			return -EINVAL;
463
+		if (ret % 3) {
464
+			ret = -EINVAL;
465
+			goto put_device;
466
+		}
467
+
417468 		num_timers = ret / 3;
418469 		timers = devm_kcalloc(dev, num_timers, sizeof(*timers),
419470 				      GFP_KERNEL);
420
-		if (!timers)
421
-			return -ENOMEM;
471
+		if (!timers) {
472
+			ret = -ENOMEM;
473
+			goto put_device;
474
+		}
422475 		for (i = 0; i < num_timers; i++) {
423476 			u32 tmp;
424477 
425478 			of_property_read_u32_index(np, "timers", 3 * i,
426479 						   &timers[i].mode);
427
-			if (timers[i].mode >= NETXBIG_LED_MODE_NUM)
428
-				return -EINVAL;
480
+			if (timers[i].mode >= NETXBIG_LED_MODE_NUM) {
481
+				ret = -EINVAL;
482
+				goto put_device;
483
+			}
429484 			of_property_read_u32_index(np, "timers",
430485 						   3 * i + 1, &tmp);
431486 			timers[i].delay_on = tmp;
....@@ -438,18 +493,21 @@
438493 	}
439494 
440495 	/* LEDs */
441
-	num_leds = of_get_child_count(np);
496
+	num_leds = of_get_available_child_count(np);
442497 	if (!num_leds) {
443498 		dev_err(dev, "No LED subnodes found in DT\n");
444
-		return -ENODEV;
499
+		ret = -ENODEV;
500
+		goto put_device;
445501 	}
446502 
447503 	leds = devm_kcalloc(dev, num_leds, sizeof(*leds), GFP_KERNEL);
448
-	if (!leds)
449
-		return -ENOMEM;
504
+	if (!leds) {
505
+		ret = -ENOMEM;
506
+		goto put_device;
507
+	}
450508 
451509 	led = leds;
452
-	for_each_child_of_node(np, child) {
510
+	for_each_available_child_of_node(np, child) {
453511 		const char *string;
454512 		int *mode_val;
455513 		int num_modes;
....@@ -527,6 +585,8 @@
527585 
528586 err_node_put:
529587 	of_node_put(child);
588
+put_device:
589
+	put_device(gpio_ext_dev);
530590 	return ret;
531591 }
532592 
....@@ -535,40 +595,26 @@
535595 	{},
536596 };
537597 MODULE_DEVICE_TABLE(of, of_netxbig_leds_match);
538
-#else
539
-static inline int
540
-netxbig_leds_get_of_pdata(struct device *dev,
541
-			  struct netxbig_led_platform_data *pdata)
542
-{
543
-	return -ENODEV;
544
-}
545
-#endif /* CONFIG_OF_GPIO */
546598 
547599 static int netxbig_led_probe(struct platform_device *pdev)
548600 {
549
-	struct netxbig_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
601
+	struct netxbig_led_platform_data *pdata;
550602 	struct netxbig_led_data *leds_data;
551603 	int i;
552604 	int ret;
553605 
554
-	if (!pdata) {
555
-		pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
556
-		if (!pdata)
557
-			return -ENOMEM;
558
-		ret = netxbig_leds_get_of_pdata(&pdev->dev, pdata);
559
-		if (ret)
560
-			return ret;
561
-	}
606
+	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
607
+	if (!pdata)
608
+		return -ENOMEM;
609
+	ret = netxbig_leds_get_of_pdata(&pdev->dev, pdata);
610
+	if (ret)
611
+		return ret;
562612 
563613 	leds_data = devm_kcalloc(&pdev->dev,
564614 				 pdata->num_leds, sizeof(*leds_data),
565615 				 GFP_KERNEL);
566616 	if (!leds_data)
567617 		return -ENOMEM;
568
-
569
-	ret = gpio_ext_init(pdev, pdata->gpio_ext);
570
-	if (ret < 0)
571
-		return ret;
572618 
573619 	for (i = 0; i < pdata->num_leds; i++) {
574620 		ret = create_netxbig_led(pdev, pdata,
....@@ -584,7 +630,7 @@
584630 	.probe		= netxbig_led_probe,
585631 	.driver		= {
586632 		.name		= "leds-netxbig",
587
-		.of_match_table	= of_match_ptr(of_netxbig_leds_match),
633
+		.of_match_table	= of_netxbig_leds_match,
588634 	},
589635 };
590636