Lines Matching +full:on +full:- +full:chip
1 // SPDX-License-Identifier: GPL-2.0-only
3 * Driver for PCA9685 16-channel 12-bit PWM LED controller
8 * based on the pwm-twl-led.c driver
25 * Because the PCA9685 has only one prescaler per chip, only the first channel
87 static inline struct pca9685 *to_pca(struct pwm_chip *chip) in to_pca() argument
89 return pwmchip_get_drvdata(chip); in to_pca()
96 if (bitmap_empty(pca->pwms_enabled, PCA9685_MAXCHAN + 1)) in pca9685_prescaler_can_change()
99 if (bitmap_weight(pca->pwms_enabled, PCA9685_MAXCHAN + 1) > 1) in pca9685_prescaler_can_change()
105 return test_bit(channel, pca->pwms_enabled); in pca9685_prescaler_can_change()
108 static int pca9685_read_reg(struct pwm_chip *chip, unsigned int reg, unsigned int *val) in pca9685_read_reg() argument
110 struct pca9685 *pca = to_pca(chip); in pca9685_read_reg()
111 struct device *dev = pwmchip_parent(chip); in pca9685_read_reg()
114 err = regmap_read(pca->regmap, reg, val); in pca9685_read_reg()
121 static int pca9685_write_reg(struct pwm_chip *chip, unsigned int reg, unsigned int val) in pca9685_write_reg() argument
123 struct pca9685 *pca = to_pca(chip); in pca9685_write_reg()
124 struct device *dev = pwmchip_parent(chip); in pca9685_write_reg()
127 err = regmap_write(pca->regmap, reg, val); in pca9685_write_reg()
134 /* Helper function to set the duty cycle ratio to duty/4096 (e.g. duty=2048 -> 50%) */
135 static void pca9685_pwm_set_duty(struct pwm_chip *chip, int channel, unsigned int duty) in pca9685_pwm_set_duty() argument
137 struct pwm_device *pwm = &chip->pwms[channel]; in pca9685_pwm_set_duty()
138 unsigned int on, off; in pca9685_pwm_set_duty() local
142 pca9685_write_reg(chip, REG_OFF_H(channel), LED_FULL); in pca9685_pwm_set_duty()
145 /* Set the full ON bit and clear the full OFF bit */ in pca9685_pwm_set_duty()
146 pca9685_write_reg(chip, REG_ON_H(channel), LED_FULL); in pca9685_pwm_set_duty()
147 pca9685_write_reg(chip, REG_OFF_H(channel), 0); in pca9685_pwm_set_duty()
152 if (pwm->state.usage_power && channel < PCA9685_MAXCHAN) { in pca9685_pwm_set_duty()
157 * turn on at the same time, while still maintaining the in pca9685_pwm_set_duty()
160 on = channel * PCA9685_COUNTER_RANGE / PCA9685_MAXCHAN; in pca9685_pwm_set_duty()
162 on = 0; in pca9685_pwm_set_duty()
164 off = (on + duty) % PCA9685_COUNTER_RANGE; in pca9685_pwm_set_duty()
166 /* Set ON time (clears full ON bit) */ in pca9685_pwm_set_duty()
167 pca9685_write_reg(chip, REG_ON_L(channel), on & 0xff); in pca9685_pwm_set_duty()
168 pca9685_write_reg(chip, REG_ON_H(channel), (on >> 8) & 0xf); in pca9685_pwm_set_duty()
170 pca9685_write_reg(chip, REG_OFF_L(channel), off & 0xff); in pca9685_pwm_set_duty()
171 pca9685_write_reg(chip, REG_OFF_H(channel), (off >> 8) & 0xf); in pca9685_pwm_set_duty()
174 static unsigned int pca9685_pwm_get_duty(struct pwm_chip *chip, int channel) in pca9685_pwm_get_duty() argument
176 struct pwm_device *pwm = &chip->pwms[channel]; in pca9685_pwm_get_duty()
177 unsigned int off = 0, on = 0, val = 0; in pca9685_pwm_get_duty() local
184 pca9685_read_reg(chip, LED_N_OFF_H(channel), &off); in pca9685_pwm_get_duty()
190 pca9685_read_reg(chip, LED_N_ON_H(channel), &on); in pca9685_pwm_get_duty()
191 if (on & LED_FULL) { in pca9685_pwm_get_duty()
192 /* Full ON bit is set */ in pca9685_pwm_get_duty()
196 pca9685_read_reg(chip, LED_N_OFF_L(channel), &val); in pca9685_pwm_get_duty()
198 if (!pwm->state.usage_power) in pca9685_pwm_get_duty()
201 /* Read ON register to calculate duty cycle of staggered output */ in pca9685_pwm_get_duty()
202 if (pca9685_read_reg(chip, LED_N_ON_L(channel), &val)) { in pca9685_pwm_get_duty()
206 on = ((on & 0xf) << 8) | (val & 0xff); in pca9685_pwm_get_duty()
207 return (off - on) & (PCA9685_COUNTER_RANGE - 1); in pca9685_pwm_get_duty()
215 mutex_lock(&pca->lock); in pca9685_pwm_test_and_set_inuse()
221 if (!bitmap_empty(pca->pwms_inuse, PCA9685_MAXCHAN)) { in pca9685_pwm_test_and_set_inuse()
230 if (test_bit(PCA9685_MAXCHAN, pca->pwms_inuse)) { in pca9685_pwm_test_and_set_inuse()
235 is_inuse = test_and_set_bit(pwm_idx, pca->pwms_inuse); in pca9685_pwm_test_and_set_inuse()
237 mutex_unlock(&pca->lock); in pca9685_pwm_test_and_set_inuse()
243 mutex_lock(&pca->lock); in pca9685_pwm_clear_inuse()
244 clear_bit(pwm_idx, pca->pwms_inuse); in pca9685_pwm_clear_inuse()
245 mutex_unlock(&pca->lock); in pca9685_pwm_clear_inuse()
250 struct pwm_chip *chip = gpiochip_get_data(gpio); in pca9685_pwm_gpio_request() local
251 struct pca9685 *pca = to_pca(chip); in pca9685_pwm_gpio_request()
254 return -EBUSY; in pca9685_pwm_gpio_request()
255 pm_runtime_get_sync(pwmchip_parent(chip)); in pca9685_pwm_gpio_request()
261 struct pwm_chip *chip = gpiochip_get_data(gpio); in pca9685_pwm_gpio_get() local
263 return pca9685_pwm_get_duty(chip, offset) != 0; in pca9685_pwm_gpio_get()
269 struct pwm_chip *chip = gpiochip_get_data(gpio); in pca9685_pwm_gpio_set() local
271 pca9685_pwm_set_duty(chip, offset, value ? PCA9685_COUNTER_RANGE : 0); in pca9685_pwm_gpio_set()
276 struct pwm_chip *chip = gpiochip_get_data(gpio); in pca9685_pwm_gpio_free() local
277 struct pca9685 *pca = to_pca(chip); in pca9685_pwm_gpio_free()
279 pca9685_pwm_set_duty(chip, offset, 0); in pca9685_pwm_gpio_free()
280 pm_runtime_put(pwmchip_parent(chip)); in pca9685_pwm_gpio_free()
284 static int pca9685_pwm_gpio_get_direction(struct gpio_chip *chip, in pca9685_pwm_gpio_get_direction() argument
294 return -EINVAL; in pca9685_pwm_gpio_direction_input()
306 * The PCA9685 has a bit for turning the PWM output full off or on. Some
308 * expose a GPIO chip here which can exclusively take over the underlying
311 static int pca9685_pwm_gpio_probe(struct pwm_chip *chip) in pca9685_pwm_gpio_probe() argument
313 struct pca9685 *pca = to_pca(chip); in pca9685_pwm_gpio_probe()
314 struct device *dev = pwmchip_parent(chip); in pca9685_pwm_gpio_probe()
316 pca->gpio.label = dev_name(dev); in pca9685_pwm_gpio_probe()
317 pca->gpio.parent = dev; in pca9685_pwm_gpio_probe()
318 pca->gpio.request = pca9685_pwm_gpio_request; in pca9685_pwm_gpio_probe()
319 pca->gpio.free = pca9685_pwm_gpio_free; in pca9685_pwm_gpio_probe()
320 pca->gpio.get_direction = pca9685_pwm_gpio_get_direction; in pca9685_pwm_gpio_probe()
321 pca->gpio.direction_input = pca9685_pwm_gpio_direction_input; in pca9685_pwm_gpio_probe()
322 pca->gpio.direction_output = pca9685_pwm_gpio_direction_output; in pca9685_pwm_gpio_probe()
323 pca->gpio.get = pca9685_pwm_gpio_get; in pca9685_pwm_gpio_probe()
324 pca->gpio.set = pca9685_pwm_gpio_set; in pca9685_pwm_gpio_probe()
325 pca->gpio.base = -1; in pca9685_pwm_gpio_probe()
326 pca->gpio.ngpio = PCA9685_MAXCHAN; in pca9685_pwm_gpio_probe()
327 pca->gpio.can_sleep = true; in pca9685_pwm_gpio_probe()
329 return devm_gpiochip_add_data(dev, &pca->gpio, chip); in pca9685_pwm_gpio_probe()
343 static inline int pca9685_pwm_gpio_probe(struct pwm_chip *chip) in pca9685_pwm_gpio_probe() argument
349 static void pca9685_set_sleep_mode(struct pwm_chip *chip, bool enable) in pca9685_set_sleep_mode() argument
351 struct device *dev = pwmchip_parent(chip); in pca9685_set_sleep_mode()
352 struct pca9685 *pca = to_pca(chip); in pca9685_set_sleep_mode()
353 int err = regmap_update_bits(pca->regmap, PCA9685_MODE1, in pca9685_set_sleep_mode()
367 static int __pca9685_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, in __pca9685_pwm_apply() argument
370 struct pca9685 *pca = to_pca(chip); in __pca9685_pwm_apply()
374 if (state->polarity != PWM_POLARITY_NORMAL) in __pca9685_pwm_apply()
375 return -EINVAL; in __pca9685_pwm_apply()
377 prescale = DIV_ROUND_CLOSEST_ULL(PCA9685_OSC_CLOCK_MHZ * state->period, in __pca9685_pwm_apply()
378 PCA9685_COUNTER_RANGE * 1000) - 1; in __pca9685_pwm_apply()
380 dev_err(pwmchip_parent(chip), "pwm not changed: period out of bounds!\n"); in __pca9685_pwm_apply()
381 return -EINVAL; in __pca9685_pwm_apply()
384 if (!state->enabled) { in __pca9685_pwm_apply()
385 pca9685_pwm_set_duty(chip, pwm->hwpwm, 0); in __pca9685_pwm_apply()
389 pca9685_read_reg(chip, PCA9685_PRESCALE, &val); in __pca9685_pwm_apply()
391 if (!pca9685_prescaler_can_change(pca, pwm->hwpwm)) { in __pca9685_pwm_apply()
392 dev_err(pwmchip_parent(chip), in __pca9685_pwm_apply()
394 return -EBUSY; in __pca9685_pwm_apply()
398 * Putting the chip briefly into SLEEP mode in __pca9685_pwm_apply()
403 /* Put chip into sleep mode */ in __pca9685_pwm_apply()
404 pca9685_set_sleep_mode(chip, true); in __pca9685_pwm_apply()
406 /* Change the chip-wide output frequency */ in __pca9685_pwm_apply()
407 pca9685_write_reg(chip, PCA9685_PRESCALE, prescale); in __pca9685_pwm_apply()
409 /* Wake the chip up */ in __pca9685_pwm_apply()
410 pca9685_set_sleep_mode(chip, false); in __pca9685_pwm_apply()
413 duty = PCA9685_COUNTER_RANGE * state->duty_cycle; in __pca9685_pwm_apply()
414 duty = DIV_ROUND_UP_ULL(duty, state->period); in __pca9685_pwm_apply()
415 pca9685_pwm_set_duty(chip, pwm->hwpwm, duty); in __pca9685_pwm_apply()
419 static int pca9685_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, in pca9685_pwm_apply() argument
422 struct pca9685 *pca = to_pca(chip); in pca9685_pwm_apply()
425 mutex_lock(&pca->lock); in pca9685_pwm_apply()
426 ret = __pca9685_pwm_apply(chip, pwm, state); in pca9685_pwm_apply()
428 if (state->enabled) in pca9685_pwm_apply()
429 set_bit(pwm->hwpwm, pca->pwms_enabled); in pca9685_pwm_apply()
431 clear_bit(pwm->hwpwm, pca->pwms_enabled); in pca9685_pwm_apply()
433 mutex_unlock(&pca->lock); in pca9685_pwm_apply()
438 static int pca9685_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, in pca9685_pwm_get_state() argument
444 /* Calculate (chip-wide) period from prescale value */ in pca9685_pwm_get_state()
445 pca9685_read_reg(chip, PCA9685_PRESCALE, &val); in pca9685_pwm_get_state()
451 state->period = (PCA9685_COUNTER_RANGE * 1000 / PCA9685_OSC_CLOCK_MHZ) * in pca9685_pwm_get_state()
454 /* The (per-channel) polarity is fixed */ in pca9685_pwm_get_state()
455 state->polarity = PWM_POLARITY_NORMAL; in pca9685_pwm_get_state()
457 if (pwm->hwpwm >= PCA9685_MAXCHAN) { in pca9685_pwm_get_state()
462 state->duty_cycle = 0; in pca9685_pwm_get_state()
463 state->enabled = false; in pca9685_pwm_get_state()
467 state->enabled = true; in pca9685_pwm_get_state()
468 duty = pca9685_pwm_get_duty(chip, pwm->hwpwm); in pca9685_pwm_get_state()
469 state->duty_cycle = DIV_ROUND_DOWN_ULL(duty * state->period, PCA9685_COUNTER_RANGE); in pca9685_pwm_get_state()
474 static int pca9685_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) in pca9685_pwm_request() argument
476 struct pca9685 *pca = to_pca(chip); in pca9685_pwm_request()
478 if (pca9685_pwm_test_and_set_inuse(pca, pwm->hwpwm)) in pca9685_pwm_request()
479 return -EBUSY; in pca9685_pwm_request()
481 if (pwm->hwpwm < PCA9685_MAXCHAN) { in pca9685_pwm_request()
482 /* PWMs - except the "all LEDs" channel - default to enabled */ in pca9685_pwm_request()
483 mutex_lock(&pca->lock); in pca9685_pwm_request()
484 set_bit(pwm->hwpwm, pca->pwms_enabled); in pca9685_pwm_request()
485 mutex_unlock(&pca->lock); in pca9685_pwm_request()
488 pm_runtime_get_sync(pwmchip_parent(chip)); in pca9685_pwm_request()
493 static void pca9685_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) in pca9685_pwm_free() argument
495 struct pca9685 *pca = to_pca(chip); in pca9685_pwm_free()
497 mutex_lock(&pca->lock); in pca9685_pwm_free()
498 pca9685_pwm_set_duty(chip, pwm->hwpwm, 0); in pca9685_pwm_free()
499 clear_bit(pwm->hwpwm, pca->pwms_enabled); in pca9685_pwm_free()
500 mutex_unlock(&pca->lock); in pca9685_pwm_free()
502 pm_runtime_put(pwmchip_parent(chip)); in pca9685_pwm_free()
503 pca9685_pwm_clear_inuse(pca, pwm->hwpwm); in pca9685_pwm_free()
522 struct pwm_chip *chip; in pca9685_pwm_probe() local
528 chip = devm_pwmchip_alloc(&client->dev, PCA9685_MAXCHAN + 1, sizeof(*pca)); in pca9685_pwm_probe()
529 if (IS_ERR(chip)) in pca9685_pwm_probe()
530 return PTR_ERR(chip); in pca9685_pwm_probe()
531 pca = to_pca(chip); in pca9685_pwm_probe()
533 pca->regmap = devm_regmap_init_i2c(client, &pca9685_regmap_i2c_config); in pca9685_pwm_probe()
534 if (IS_ERR(pca->regmap)) { in pca9685_pwm_probe()
535 ret = PTR_ERR(pca->regmap); in pca9685_pwm_probe()
536 dev_err(&client->dev, "Failed to initialize register map: %d\n", in pca9685_pwm_probe()
541 i2c_set_clientdata(client, chip); in pca9685_pwm_probe()
543 mutex_init(&pca->lock); in pca9685_pwm_probe()
545 ret = pca9685_read_reg(chip, PCA9685_MODE2, ®); in pca9685_pwm_probe()
549 if (device_property_read_bool(&client->dev, "invert")) in pca9685_pwm_probe()
554 if (device_property_read_bool(&client->dev, "open-drain")) in pca9685_pwm_probe()
559 ret = pca9685_write_reg(chip, PCA9685_MODE2, reg); in pca9685_pwm_probe()
564 pca9685_read_reg(chip, PCA9685_MODE1, ®); in pca9685_pwm_probe()
566 pca9685_write_reg(chip, PCA9685_MODE1, reg); in pca9685_pwm_probe()
568 /* Reset OFF/ON registers to POR default */ in pca9685_pwm_probe()
569 pca9685_write_reg(chip, PCA9685_ALL_LED_OFF_L, 0); in pca9685_pwm_probe()
570 pca9685_write_reg(chip, PCA9685_ALL_LED_OFF_H, LED_FULL); in pca9685_pwm_probe()
571 pca9685_write_reg(chip, PCA9685_ALL_LED_ON_L, 0); in pca9685_pwm_probe()
572 pca9685_write_reg(chip, PCA9685_ALL_LED_ON_H, LED_FULL); in pca9685_pwm_probe()
574 chip->ops = &pca9685_pwm_ops; in pca9685_pwm_probe()
576 ret = pwmchip_add(chip); in pca9685_pwm_probe()
580 ret = pca9685_pwm_gpio_probe(chip); in pca9685_pwm_probe()
582 pwmchip_remove(chip); in pca9685_pwm_probe()
586 pm_runtime_enable(&client->dev); in pca9685_pwm_probe()
588 if (pm_runtime_enabled(&client->dev)) { in pca9685_pwm_probe()
590 * Although the chip comes out of power-up in the sleep state, in pca9685_pwm_probe()
593 pca9685_set_sleep_mode(chip, true); in pca9685_pwm_probe()
594 pm_runtime_set_suspended(&client->dev); in pca9685_pwm_probe()
596 /* Wake the chip up if runtime PM is disabled */ in pca9685_pwm_probe()
597 pca9685_set_sleep_mode(chip, false); in pca9685_pwm_probe()
605 struct pwm_chip *chip = i2c_get_clientdata(client); in pca9685_pwm_remove() local
607 pwmchip_remove(chip); in pca9685_pwm_remove()
609 if (!pm_runtime_enabled(&client->dev)) { in pca9685_pwm_remove()
610 /* Put chip in sleep state if runtime PM is disabled */ in pca9685_pwm_remove()
611 pca9685_set_sleep_mode(chip, true); in pca9685_pwm_remove()
614 pm_runtime_disable(&client->dev); in pca9685_pwm_remove()
620 struct pwm_chip *chip = i2c_get_clientdata(client); in pca9685_pwm_runtime_suspend() local
622 pca9685_set_sleep_mode(chip, true); in pca9685_pwm_runtime_suspend()
629 struct pwm_chip *chip = i2c_get_clientdata(client); in pca9685_pwm_runtime_resume() local
631 pca9685_set_sleep_mode(chip, false); in pca9685_pwm_runtime_resume()
648 { .compatible = "nxp,pca9685-pwm", },
660 .name = "pca9685-pwm",