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. */
127 	/* pwm lock */
148 	struct lm8323_pwm	pwm[LM8323_NUM_PWMS];  member
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()
392 					 "pwm%d engine completed\n", i);  in lm8323_irq()
393 				pwm_done(&lm->pwm[i]);  in lm8323_irq()
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()
466 	if ((pwm->fade_time / steps) > (32768 / 512)) {  in lm8323_pwm_work()
474 	perstep = (hz * pwm->fade_time) / (steps * 1000);  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()
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()
626 	int pwm;  in lm8323_probe()  local
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()
762 		if (lm->pwm[i].enabled)  in lm8323_suspend()
763 			led_classdev_suspend(&lm->pwm[i].cdev);  in lm8323_suspend()
779 		if (lm->pwm[i].enabled)  in lm8323_resume()
780 			led_classdev_resume(&lm->pwm[i].cdev);  in lm8323_resume()