1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 2007-2009 Nokia Corporation
18 #include <linux/delay.h>
46 #define LM8323_CMD_PWM_WRITE		0x95 /* Write PWM script. */
47 #define LM8323_CMD_START_PWM		0x96 /* Start PWM engine. */
48 #define LM8323_CMD_STOP_PWM		0x97 /* Stop PWM engine. */
88 /* Commands for PWM engine; feed in with PWM_WRITE. */
89 /* Load ramp counter from duty cycle field (range 0 - 0xff). */
127 	/* pwm lock */
148 	struct lm8323_pwm	pwm[LM8323_NUM_PWMS];  member
152 #define dev_to_lm8323(d)	container_of(d, struct lm8323_chip, client->dev)
172 		dev_err(&lm->client->dev, "tried to send %d bytes\n", len);  in lm8323_write()
186 	ret = i2c_master_send(lm->client, data, len);  in lm8323_write()
187 	if (unlikely(ret == -EREMOTEIO))  in lm8323_write()
188 		ret = i2c_master_send(lm->client, data, len);  in lm8323_write()
190 		dev_err(&lm->client->dev, "sent %d bytes of %d total\n",  in lm8323_write()
208 	ret = i2c_master_send(lm->client, &cmd, 1);  in lm8323_read()
209 	if (unlikely(ret == -EREMOTEIO))  in lm8323_read()
210 		ret = i2c_master_send(lm->client, &cmd, 1);  in lm8323_read()
212 		dev_err(&lm->client->dev, "sending read cmd 0x%02x failed\n",  in lm8323_read()
217 	ret = i2c_master_recv(lm->client, buf, len);  in lm8323_read()
219 		dev_err(&lm->client->dev, "wanted %d bytes, got %d\n",  in lm8323_read()
234  * The signals are AT-style: the low 7 bits are the keycode, and the top
251 	int old_keys_down = lm->keys_down;  in process_keys()
262 		dev_err(&lm->client->dev, "Failed reading fifo \n");  in process_keys()
270 		unsigned short keycode = lm->keymap[key];  in process_keys()
272 		dev_vdbg(&lm->client->dev, "key 0x%02x %s\n",  in process_keys()
275 		if (lm->kp_enabled) {  in process_keys()
276 			input_event(lm->idev, EV_MSC, MSC_SCAN, key);  in process_keys()
277 			input_report_key(lm->idev, keycode, isdown);  in process_keys()
278 			input_sync(lm->idev);  in process_keys()
282 			lm->keys_down++;  in process_keys()
284 			lm->keys_down--;  in process_keys()
292 	if (!old_keys_down && lm->keys_down)  in process_keys()
294 	if (old_keys_down && !lm->keys_down)  in process_keys()
295 		lm8323_set_active_time(lm, lm->active_time);  in process_keys()
304 			dev_vdbg(&lm->client->dev, "fifo overflow!\n");  in lm8323_process_error()
306 			dev_vdbg(&lm->client->dev,  in lm8323_process_error()
309 			dev_vdbg(&lm->client->dev,  in lm8323_process_error()
312 			dev_vdbg(&lm->client->dev, "bad command parameter\n");  in lm8323_process_error()
324 	int keysize = (lm->size_x << 4) | lm->size_y;  in lm8323_configure()
326 	int debounce = lm->debounce_time >> 2;  in lm8323_configure()
327 	int active = lm->active_time >> 2;  in lm8323_configure()
331 	 * a close-run thing, give ourselves a 12ms buffer.  in lm8323_configure()
339 	lm8323_set_active_time(lm, lm->active_time);  in lm8323_configure()
352 static void pwm_done(struct lm8323_pwm *pwm)  in pwm_done()  argument
354 	guard(mutex)(&pwm->lock);  in pwm_done()
356 	pwm->running = false;  in pwm_done()
357 	if (pwm->desired_brightness != pwm->brightness)  in pwm_done()
358 		schedule_work(&pwm->work);  in pwm_done()
371 	guard(mutex)(&lm->lock);  in lm8323_irq()
378 			dev_vdbg(&lm->client->dev, "rotator fired\n");  in lm8323_irq()
381 			dev_vdbg(&lm->client->dev, "error!\n");  in lm8323_irq()
385 			dev_err(&lm->client->dev, "chip lost config; "  in lm8323_irq()
391 				dev_vdbg(&lm->client->dev,  in lm8323_irq()
392 					 "pwm%d engine completed\n", i);  in lm8323_irq()
393 				pwm_done(&lm->pwm[i]);  in lm8323_irq()
410 		return -EIO;  in lm8323_read_id()
415 static void lm8323_write_pwm_one(struct lm8323_pwm *pwm, int pos, u16 cmd)  in lm8323_write_pwm_one()  argument
417 	lm8323_write(pwm->chip, 4, LM8323_CMD_PWM_WRITE, (pos << 2) | pwm->id,  in lm8323_write_pwm_one()
422  * Write a script into a given PWM engine, concluding with PWM_END.
425  * will be kept running at the final PWM level indefinitely.
427 static void lm8323_write_pwm(struct lm8323_pwm *pwm, int kill,  in lm8323_write_pwm()  argument
433 		lm8323_write_pwm_one(pwm, i, cmds[i]);  in lm8323_write_pwm()
435 	lm8323_write_pwm_one(pwm, i++, PWM_END(kill));  in lm8323_write_pwm()
436 	lm8323_write(pwm->chip, 2, LM8323_CMD_START_PWM, pwm->id);  in lm8323_write_pwm()
437 	pwm->running = true;  in lm8323_write_pwm()
442 	struct lm8323_pwm *pwm = work_to_pwm(work);  in lm8323_pwm_work()  local
447 	guard(mutex)(&pwm->lock);  in lm8323_pwm_work()
452 	 * case we will be called again when the previous PWM script  in lm8323_pwm_work()
455 	if (pwm->running || pwm->desired_brightness == pwm->brightness)  in lm8323_pwm_work()
458 	kill = (pwm->desired_brightness == 0);  in lm8323_pwm_work()
459 	up = (pwm->desired_brightness > pwm->brightness);  in lm8323_pwm_work()
460 	steps = abs(pwm->desired_brightness - pwm->brightness);  in lm8323_pwm_work()
463 	 * Convert time (in ms) into a divisor (512 or 16 on a refclk of  in lm8323_pwm_work()
466 	if ((pwm->fade_time / steps) > (32768 / 512)) {  in lm8323_pwm_work()
474 	perstep = (hz * pwm->fade_time) / (steps * 1000);  in lm8323_pwm_work()
486 		steps -= s;  in lm8323_pwm_work()
489 	lm8323_write_pwm(pwm, kill, num_cmds, pwm_cmds);  in lm8323_pwm_work()
490 	pwm->brightness = pwm->desired_brightness;  in lm8323_pwm_work()
496 	struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);  in lm8323_pwm_set_brightness()  local
497 	struct lm8323_chip *lm = pwm->chip;  in lm8323_pwm_set_brightness()
499 	scoped_guard(mutex, &pwm->lock) {  in lm8323_pwm_set_brightness()
500 		pwm->desired_brightness = brightness;  in lm8323_pwm_set_brightness()
504 		schedule_work(&pwm->work);  in lm8323_pwm_set_brightness()
507 		 * Schedule PWM work as usual unless we are going into suspend  in lm8323_pwm_set_brightness()
509 		scoped_guard(mutex, &lm->lock) {  in lm8323_pwm_set_brightness()
510 			if (likely(!lm->pm_suspend))  in lm8323_pwm_set_brightness()
511 				schedule_work(&pwm->work);  in lm8323_pwm_set_brightness()
513 				lm8323_pwm_work(&pwm->work);  in lm8323_pwm_set_brightness()
522 	struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);  in lm8323_pwm_show_time()  local
524 	return sprintf(buf, "%d\n", pwm->fade_time);  in lm8323_pwm_show_time()
531 	struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);  in lm8323_pwm_store_time()  local
539 	pwm->fade_time = time;  in lm8323_pwm_store_time()
554 	struct lm8323_pwm *pwm;  in init_pwm()  local
559 	pwm = &lm->pwm[id - 1];  in init_pwm()
561 	pwm->id = id;  in init_pwm()
562 	pwm->fade_time = 0;  in init_pwm()
563 	pwm->brightness = 0;  in init_pwm()
564 	pwm->desired_brightness = 0;  in init_pwm()
565 	pwm->running = false;  in init_pwm()
566 	pwm->enabled = false;  in init_pwm()
567 	INIT_WORK(&pwm->work, lm8323_pwm_work);  in init_pwm()
568 	mutex_init(&pwm->lock);  in init_pwm()
569 	pwm->chip = lm;  in init_pwm()
572 		pwm->cdev.name = name;  in init_pwm()
573 		pwm->cdev.brightness_set = lm8323_pwm_set_brightness;  in init_pwm()
574 		pwm->cdev.groups = lm8323_pwm_groups;  in init_pwm()
576 		err = devm_led_classdev_register(dev, &pwm->cdev);  in init_pwm()
578 			dev_err(dev, "couldn't register PWM %d: %d\n", id, err);  in init_pwm()
581 		pwm->enabled = true;  in init_pwm()
592 	return sprintf(buf, "%u\n", !lm->kp_enabled);  in lm8323_show_disable()
607 	guard(mutex)(&lm->lock);  in lm8323_set_disable()
609 	lm->kp_enabled = !i;  in lm8323_set_disable()
623 	struct lm8323_platform_data *pdata = dev_get_platdata(&client->dev);  in lm8323_probe()
626 	int pwm;  in lm8323_probe()  local
631 	if (!pdata || !pdata->size_x || !pdata->size_y) {  in lm8323_probe()
632 		dev_err(&client->dev, "missing platform_data\n");  in lm8323_probe()
633 		return -EINVAL;  in lm8323_probe()
636 	if (pdata->size_x > 8) {  in lm8323_probe()
637 		dev_err(&client->dev, "invalid x size %d specified\n",  in lm8323_probe()
638 			pdata->size_x);  in lm8323_probe()
639 		return -EINVAL;  in lm8323_probe()
642 	if (pdata->size_y > 12) {  in lm8323_probe()
643 		dev_err(&client->dev, "invalid y size %d specified\n",  in lm8323_probe()
644 			pdata->size_y);  in lm8323_probe()
645 		return -EINVAL;  in lm8323_probe()
648 	lm = devm_kzalloc(&client->dev, sizeof(*lm), GFP_KERNEL);  in lm8323_probe()
650 		return -ENOMEM;  in lm8323_probe()
652 	idev = devm_input_allocate_device(&client->dev);  in lm8323_probe()
654 		return -ENOMEM;  in lm8323_probe()
656 	lm->client = client;  in lm8323_probe()
657 	lm->idev = idev;  in lm8323_probe()
658 	mutex_init(&lm->lock);  in lm8323_probe()
660 	lm->size_x = pdata->size_x;  in lm8323_probe()
661 	lm->size_y = pdata->size_y;  in lm8323_probe()
662 	dev_vdbg(&client->dev, "Keypad size: %d x %d\n",  in lm8323_probe()
663 		 lm->size_x, lm->size_y);  in lm8323_probe()
665 	lm->debounce_time = pdata->debounce_time;  in lm8323_probe()
666 	lm->active_time = pdata->active_time;  in lm8323_probe()
672 	 * 100ms until we can configure.  in lm8323_probe()
680 			dev_err(&client->dev,  in lm8323_probe()
692 		dev_err(&client->dev, "device not found\n");  in lm8323_probe()
693 		return -ENODEV;  in lm8323_probe()
696 	for (pwm = 0; pwm < LM8323_NUM_PWMS; pwm++) {  in lm8323_probe()
697 		err = init_pwm(lm, pwm + 1, &client->dev,  in lm8323_probe()
698 			       pdata->pwm_names[pwm]);  in lm8323_probe()
703 	lm->kp_enabled = true;  in lm8323_probe()
705 	idev->name = pdata->name ? : "LM8323 keypad";  in lm8323_probe()
706 	snprintf(lm->phys, sizeof(lm->phys),  in lm8323_probe()
707 		 "%s/input-kp", dev_name(&client->dev));  in lm8323_probe()
708 	idev->phys = lm->phys;  in lm8323_probe()
710 	idev->evbit[0] = BIT(EV_KEY) | BIT(EV_MSC);  in lm8323_probe()
711 	__set_bit(MSC_SCAN, idev->mscbit);  in lm8323_probe()
713 		__set_bit(pdata->keymap[i], idev->keybit);  in lm8323_probe()
714 		lm->keymap[i] = pdata->keymap[i];  in lm8323_probe()
716 	__clear_bit(KEY_RESERVED, idev->keybit);  in lm8323_probe()
718 	if (pdata->repeat)  in lm8323_probe()
719 		__set_bit(EV_REP, idev->evbit);  in lm8323_probe()
723 		dev_dbg(&client->dev, "error registering input device\n");  in lm8323_probe()
727 	err = devm_request_threaded_irq(&client->dev, client->irq,  in lm8323_probe()
732 		dev_err(&client->dev, "could not get IRQ %d\n", client->irq);  in lm8323_probe()
738 	device_init_wakeup(&client->dev, 1);  in lm8323_probe()
739 	enable_irq_wake(client->irq);  in lm8323_probe()
745  * We don't need to explicitly suspend the chip, as it already switches off
754 	irq_set_irq_wake(client->irq, 0);  in lm8323_suspend()
755 	disable_irq(client->irq);  in lm8323_suspend()
757 	scoped_guard(mutex, &lm->lock) {  in lm8323_suspend()
758 		lm->pm_suspend = true;  in lm8323_suspend()
762 		if (lm->pwm[i].enabled)  in lm8323_suspend()
763 			led_classdev_suspend(&lm->pwm[i].cdev);  in lm8323_suspend()
774 	scoped_guard(mutex, &lm->lock) {  in lm8323_resume()
775 		lm->pm_suspend = false;  in lm8323_resume()
779 		if (lm->pwm[i].enabled)  in lm8323_resume()
780 			led_classdev_resume(&lm->pwm[i].cdev);  in lm8323_resume()
782 	enable_irq(client->irq);  in lm8323_resume()
783 	irq_set_irq_wake(client->irq, 1);  in lm8323_resume()