Lines Matching +full:pwm +full:- +full:gpio
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
11 #include <linux/gpio/driver.h>
17 #include <linux/pwm.h>
27 * PWM channels requested afterwards must use a period that results in the same
82 struct gpio_chip gpio; member
95 /* No PWM enabled: Change allowed */ in pca9685_prescaler_can_change()
96 if (bitmap_empty(pca->pwms_enabled, PCA9685_MAXCHAN + 1)) in pca9685_prescaler_can_change()
98 /* More than one PWM enabled: Change not allowed */ in pca9685_prescaler_can_change()
99 if (bitmap_weight(pca->pwms_enabled, PCA9685_MAXCHAN + 1) > 1) in pca9685_prescaler_can_change()
102 * Only one PWM enabled: Change allowed if the PWM about to in pca9685_prescaler_can_change()
105 return test_bit(channel, pca->pwms_enabled); in pca9685_prescaler_can_change()
114 err = regmap_read(pca->regmap, reg, val); in pca9685_read_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%) */
137 struct pwm_device *pwm = &chip->pwms[channel]; in pca9685_pwm_set_duty() local
152 if (pwm->state.usage_power && channel < PCA9685_MAXCHAN) { in pca9685_pwm_set_duty()
176 struct pwm_device *pwm = &chip->pwms[channel]; in pca9685_pwm_get_duty() local
198 if (!pwm->state.usage_power) 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()
248 static int pca9685_pwm_gpio_request(struct gpio_chip *gpio, unsigned int offset) in pca9685_pwm_gpio_request() argument
250 struct pwm_chip *chip = gpiochip_get_data(gpio); in pca9685_pwm_gpio_request()
254 return -EBUSY; in pca9685_pwm_gpio_request()
259 static int pca9685_pwm_gpio_get(struct gpio_chip *gpio, unsigned int offset) in pca9685_pwm_gpio_get() argument
261 struct pwm_chip *chip = gpiochip_get_data(gpio); in pca9685_pwm_gpio_get()
266 static int pca9685_pwm_gpio_set(struct gpio_chip *gpio, unsigned int offset, in pca9685_pwm_gpio_set() argument
269 struct pwm_chip *chip = gpiochip_get_data(gpio); in pca9685_pwm_gpio_set()
276 static void pca9685_pwm_gpio_free(struct gpio_chip *gpio, unsigned int offset) in pca9685_pwm_gpio_free() argument
278 struct pwm_chip *chip = gpiochip_get_data(gpio); in pca9685_pwm_gpio_free()
293 static int pca9685_pwm_gpio_direction_input(struct gpio_chip *gpio, in pca9685_pwm_gpio_direction_input() argument
296 return -EINVAL; in pca9685_pwm_gpio_direction_input()
299 static int pca9685_pwm_gpio_direction_output(struct gpio_chip *gpio, in pca9685_pwm_gpio_direction_output() argument
302 pca9685_pwm_gpio_set(gpio, offset, value); in pca9685_pwm_gpio_direction_output()
308 * The PCA9685 has a bit for turning the PWM output full off or on. Some
310 * expose a GPIO chip here which can exclusively take over the underlying
311 * PWM channel.
318 pca->gpio.label = dev_name(dev); in pca9685_pwm_gpio_probe()
319 pca->gpio.parent = dev; in pca9685_pwm_gpio_probe()
320 pca->gpio.request = pca9685_pwm_gpio_request; in pca9685_pwm_gpio_probe()
321 pca->gpio.free = pca9685_pwm_gpio_free; in pca9685_pwm_gpio_probe()
322 pca->gpio.get_direction = pca9685_pwm_gpio_get_direction; in pca9685_pwm_gpio_probe()
323 pca->gpio.direction_input = pca9685_pwm_gpio_direction_input; in pca9685_pwm_gpio_probe()
324 pca->gpio.direction_output = pca9685_pwm_gpio_direction_output; in pca9685_pwm_gpio_probe()
325 pca->gpio.get = pca9685_pwm_gpio_get; in pca9685_pwm_gpio_probe()
326 pca->gpio.set_rv = pca9685_pwm_gpio_set; in pca9685_pwm_gpio_probe()
327 pca->gpio.base = -1; in pca9685_pwm_gpio_probe()
328 pca->gpio.ngpio = PCA9685_MAXCHAN; in pca9685_pwm_gpio_probe()
329 pca->gpio.can_sleep = true; in pca9685_pwm_gpio_probe()
331 return devm_gpiochip_add_data(dev, &pca->gpio, chip); in pca9685_pwm_gpio_probe()
355 int err = regmap_update_bits(pca->regmap, PCA9685_MODE1, in pca9685_set_sleep_mode()
369 static int __pca9685_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, in __pca9685_pwm_apply() argument
376 if (state->polarity != PWM_POLARITY_NORMAL) in __pca9685_pwm_apply()
377 return -EINVAL; in __pca9685_pwm_apply()
379 prescale = DIV_ROUND_CLOSEST_ULL(PCA9685_OSC_CLOCK_MHZ * state->period, in __pca9685_pwm_apply()
380 PCA9685_COUNTER_RANGE * 1000) - 1; in __pca9685_pwm_apply()
382 dev_err(pwmchip_parent(chip), "pwm not changed: period out of bounds!\n"); in __pca9685_pwm_apply()
383 return -EINVAL; in __pca9685_pwm_apply()
386 if (!state->enabled) { in __pca9685_pwm_apply()
387 pca9685_pwm_set_duty(chip, pwm->hwpwm, 0); in __pca9685_pwm_apply()
393 if (!pca9685_prescaler_can_change(pca, pwm->hwpwm)) { in __pca9685_pwm_apply()
395 "pwm not changed: periods of enabled pwms must match!\n"); in __pca9685_pwm_apply()
396 return -EBUSY; in __pca9685_pwm_apply()
408 /* Change the chip-wide output frequency */ in __pca9685_pwm_apply()
415 duty = PCA9685_COUNTER_RANGE * state->duty_cycle; in __pca9685_pwm_apply()
416 duty = DIV_ROUND_UP_ULL(duty, state->period); in __pca9685_pwm_apply()
417 pca9685_pwm_set_duty(chip, pwm->hwpwm, duty); in __pca9685_pwm_apply()
421 static int pca9685_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, in pca9685_pwm_apply() argument
427 mutex_lock(&pca->lock); in pca9685_pwm_apply()
428 ret = __pca9685_pwm_apply(chip, pwm, state); in pca9685_pwm_apply()
430 if (state->enabled) in pca9685_pwm_apply()
431 set_bit(pwm->hwpwm, pca->pwms_enabled); in pca9685_pwm_apply()
433 clear_bit(pwm->hwpwm, pca->pwms_enabled); in pca9685_pwm_apply()
435 mutex_unlock(&pca->lock); in pca9685_pwm_apply()
440 static int pca9685_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, in pca9685_pwm_get_state() argument
446 /* Calculate (chip-wide) period from prescale value */ in pca9685_pwm_get_state()
453 state->period = (PCA9685_COUNTER_RANGE * 1000 / PCA9685_OSC_CLOCK_MHZ) * in pca9685_pwm_get_state()
456 /* The (per-channel) polarity is fixed */ in pca9685_pwm_get_state()
457 state->polarity = PWM_POLARITY_NORMAL; in pca9685_pwm_get_state()
459 if (pwm->hwpwm >= PCA9685_MAXCHAN) { in pca9685_pwm_get_state()
464 state->duty_cycle = 0; in pca9685_pwm_get_state()
465 state->enabled = false; in pca9685_pwm_get_state()
469 state->enabled = true; in pca9685_pwm_get_state()
470 duty = pca9685_pwm_get_duty(chip, pwm->hwpwm); in pca9685_pwm_get_state()
471 state->duty_cycle = DIV_ROUND_DOWN_ULL(duty * state->period, PCA9685_COUNTER_RANGE); in pca9685_pwm_get_state()
476 static int pca9685_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) in pca9685_pwm_request() argument
480 if (pca9685_pwm_test_and_set_inuse(pca, pwm->hwpwm)) in pca9685_pwm_request()
481 return -EBUSY; in pca9685_pwm_request()
483 if (pwm->hwpwm < PCA9685_MAXCHAN) { in pca9685_pwm_request()
484 /* PWMs - except the "all LEDs" channel - default to enabled */ in pca9685_pwm_request()
485 mutex_lock(&pca->lock); in pca9685_pwm_request()
486 set_bit(pwm->hwpwm, pca->pwms_enabled); in pca9685_pwm_request()
487 mutex_unlock(&pca->lock); in pca9685_pwm_request()
495 static void pca9685_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) in pca9685_pwm_free() argument
499 mutex_lock(&pca->lock); in pca9685_pwm_free()
500 pca9685_pwm_set_duty(chip, pwm->hwpwm, 0); in pca9685_pwm_free()
501 clear_bit(pwm->hwpwm, pca->pwms_enabled); in pca9685_pwm_free()
502 mutex_unlock(&pca->lock); in pca9685_pwm_free()
505 pca9685_pwm_clear_inuse(pca, pwm->hwpwm); in pca9685_pwm_free()
530 chip = devm_pwmchip_alloc(&client->dev, PCA9685_MAXCHAN + 1, sizeof(*pca)); in pca9685_pwm_probe()
535 pca->regmap = devm_regmap_init_i2c(client, &pca9685_regmap_i2c_config); in pca9685_pwm_probe()
536 if (IS_ERR(pca->regmap)) { in pca9685_pwm_probe()
537 ret = PTR_ERR(pca->regmap); in pca9685_pwm_probe()
538 dev_err(&client->dev, "Failed to initialize register map: %d\n", in pca9685_pwm_probe()
545 mutex_init(&pca->lock); in pca9685_pwm_probe()
551 if (device_property_read_bool(&client->dev, "invert")) in pca9685_pwm_probe()
556 if (device_property_read_bool(&client->dev, "open-drain")) in pca9685_pwm_probe()
576 chip->ops = &pca9685_pwm_ops; in pca9685_pwm_probe()
588 pm_runtime_enable(&client->dev); in pca9685_pwm_probe()
590 if (pm_runtime_enabled(&client->dev)) { in pca9685_pwm_probe()
592 * Although the chip comes out of power-up in the sleep state, in pca9685_pwm_probe()
596 pm_runtime_set_suspended(&client->dev); in pca9685_pwm_probe()
611 if (!pm_runtime_enabled(&client->dev)) { in pca9685_pwm_remove()
616 pm_runtime_disable(&client->dev); in pca9685_pwm_remove()
650 { .compatible = "nxp,pca9685-pwm", },
662 .name = "pca9685-pwm",
675 MODULE_DESCRIPTION("PWM driver for PCA9685");