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-rw-r--r--drivers/pwm/pwm-pca9685.c678
1 files changed, 678 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-pca9685.c b/drivers/pwm/pwm-pca9685.c
new file mode 100644
index 000000000..41be244e7
--- /dev/null
+++ b/drivers/pwm/pwm-pca9685.c
@@ -0,0 +1,678 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for PCA9685 16-channel 12-bit PWM LED controller
+ *
+ * Copyright (C) 2013 Steffen Trumtrar <s.trumtrar@pengutronix.de>
+ * Copyright (C) 2015 Clemens Gruber <clemens.gruber@pqgruber.com>
+ *
+ * based on the pwm-twl-led.c driver
+ */
+
+#include <linux/acpi.h>
+#include <linux/gpio/driver.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/pwm.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/pm_runtime.h>
+#include <linux/bitmap.h>
+
+/*
+ * Because the PCA9685 has only one prescaler per chip, only the first channel
+ * that is enabled is allowed to change the prescale register.
+ * PWM channels requested afterwards must use a period that results in the same
+ * prescale setting as the one set by the first requested channel.
+ * GPIOs do not count as enabled PWMs as they are not using the prescaler.
+ */
+
+#define PCA9685_MODE1 0x00
+#define PCA9685_MODE2 0x01
+#define PCA9685_SUBADDR1 0x02
+#define PCA9685_SUBADDR2 0x03
+#define PCA9685_SUBADDR3 0x04
+#define PCA9685_ALLCALLADDR 0x05
+#define PCA9685_LEDX_ON_L 0x06
+#define PCA9685_LEDX_ON_H 0x07
+#define PCA9685_LEDX_OFF_L 0x08
+#define PCA9685_LEDX_OFF_H 0x09
+
+#define PCA9685_ALL_LED_ON_L 0xFA
+#define PCA9685_ALL_LED_ON_H 0xFB
+#define PCA9685_ALL_LED_OFF_L 0xFC
+#define PCA9685_ALL_LED_OFF_H 0xFD
+#define PCA9685_PRESCALE 0xFE
+
+#define PCA9685_PRESCALE_MIN 0x03 /* => max. frequency of 1526 Hz */
+#define PCA9685_PRESCALE_MAX 0xFF /* => min. frequency of 24 Hz */
+
+#define PCA9685_COUNTER_RANGE 4096
+#define PCA9685_OSC_CLOCK_MHZ 25 /* Internal oscillator with 25 MHz */
+
+#define PCA9685_NUMREGS 0xFF
+#define PCA9685_MAXCHAN 0x10
+
+#define LED_FULL BIT(4)
+#define MODE1_ALLCALL BIT(0)
+#define MODE1_SUB3 BIT(1)
+#define MODE1_SUB2 BIT(2)
+#define MODE1_SUB1 BIT(3)
+#define MODE1_SLEEP BIT(4)
+#define MODE2_INVRT BIT(4)
+#define MODE2_OUTDRV BIT(2)
+
+#define LED_N_ON_H(N) (PCA9685_LEDX_ON_H + (4 * (N)))
+#define LED_N_ON_L(N) (PCA9685_LEDX_ON_L + (4 * (N)))
+#define LED_N_OFF_H(N) (PCA9685_LEDX_OFF_H + (4 * (N)))
+#define LED_N_OFF_L(N) (PCA9685_LEDX_OFF_L + (4 * (N)))
+
+#define REG_ON_H(C) ((C) >= PCA9685_MAXCHAN ? PCA9685_ALL_LED_ON_H : LED_N_ON_H((C)))
+#define REG_ON_L(C) ((C) >= PCA9685_MAXCHAN ? PCA9685_ALL_LED_ON_L : LED_N_ON_L((C)))
+#define REG_OFF_H(C) ((C) >= PCA9685_MAXCHAN ? PCA9685_ALL_LED_OFF_H : LED_N_OFF_H((C)))
+#define REG_OFF_L(C) ((C) >= PCA9685_MAXCHAN ? PCA9685_ALL_LED_OFF_L : LED_N_OFF_L((C)))
+
+struct pca9685 {
+ struct pwm_chip chip;
+ struct regmap *regmap;
+ struct mutex lock;
+ DECLARE_BITMAP(pwms_enabled, PCA9685_MAXCHAN + 1);
+#if IS_ENABLED(CONFIG_GPIOLIB)
+ struct gpio_chip gpio;
+ DECLARE_BITMAP(pwms_inuse, PCA9685_MAXCHAN + 1);
+#endif
+};
+
+static inline struct pca9685 *to_pca(struct pwm_chip *chip)
+{
+ return container_of(chip, struct pca9685, chip);
+}
+
+/* This function is supposed to be called with the lock mutex held */
+static bool pca9685_prescaler_can_change(struct pca9685 *pca, int channel)
+{
+ /* No PWM enabled: Change allowed */
+ if (bitmap_empty(pca->pwms_enabled, PCA9685_MAXCHAN + 1))
+ return true;
+ /* More than one PWM enabled: Change not allowed */
+ if (bitmap_weight(pca->pwms_enabled, PCA9685_MAXCHAN + 1) > 1)
+ return false;
+ /*
+ * Only one PWM enabled: Change allowed if the PWM about to
+ * be changed is the one that is already enabled
+ */
+ return test_bit(channel, pca->pwms_enabled);
+}
+
+static int pca9685_read_reg(struct pca9685 *pca, unsigned int reg, unsigned int *val)
+{
+ struct device *dev = pca->chip.dev;
+ int err;
+
+ err = regmap_read(pca->regmap, reg, val);
+ if (err)
+ dev_err(dev, "regmap_read of register 0x%x failed: %pe\n", reg, ERR_PTR(err));
+
+ return err;
+}
+
+static int pca9685_write_reg(struct pca9685 *pca, unsigned int reg, unsigned int val)
+{
+ struct device *dev = pca->chip.dev;
+ int err;
+
+ err = regmap_write(pca->regmap, reg, val);
+ if (err)
+ dev_err(dev, "regmap_write to register 0x%x failed: %pe\n", reg, ERR_PTR(err));
+
+ return err;
+}
+
+/* Helper function to set the duty cycle ratio to duty/4096 (e.g. duty=2048 -> 50%) */
+static void pca9685_pwm_set_duty(struct pca9685 *pca, int channel, unsigned int duty)
+{
+ struct pwm_device *pwm = &pca->chip.pwms[channel];
+ unsigned int on, off;
+
+ if (duty == 0) {
+ /* Set the full OFF bit, which has the highest precedence */
+ pca9685_write_reg(pca, REG_OFF_H(channel), LED_FULL);
+ return;
+ } else if (duty >= PCA9685_COUNTER_RANGE) {
+ /* Set the full ON bit and clear the full OFF bit */
+ pca9685_write_reg(pca, REG_ON_H(channel), LED_FULL);
+ pca9685_write_reg(pca, REG_OFF_H(channel), 0);
+ return;
+ }
+
+
+ if (pwm->state.usage_power && channel < PCA9685_MAXCHAN) {
+ /*
+ * If usage_power is set, the pca9685 driver will phase shift
+ * the individual channels relative to their channel number.
+ * This improves EMI because the enabled channels no longer
+ * turn on at the same time, while still maintaining the
+ * configured duty cycle / power output.
+ */
+ on = channel * PCA9685_COUNTER_RANGE / PCA9685_MAXCHAN;
+ } else
+ on = 0;
+
+ off = (on + duty) % PCA9685_COUNTER_RANGE;
+
+ /* Set ON time (clears full ON bit) */
+ pca9685_write_reg(pca, REG_ON_L(channel), on & 0xff);
+ pca9685_write_reg(pca, REG_ON_H(channel), (on >> 8) & 0xf);
+ /* Set OFF time (clears full OFF bit) */
+ pca9685_write_reg(pca, REG_OFF_L(channel), off & 0xff);
+ pca9685_write_reg(pca, REG_OFF_H(channel), (off >> 8) & 0xf);
+}
+
+static unsigned int pca9685_pwm_get_duty(struct pca9685 *pca, int channel)
+{
+ struct pwm_device *pwm = &pca->chip.pwms[channel];
+ unsigned int off = 0, on = 0, val = 0;
+
+ if (WARN_ON(channel >= PCA9685_MAXCHAN)) {
+ /* HW does not support reading state of "all LEDs" channel */
+ return 0;
+ }
+
+ pca9685_read_reg(pca, LED_N_OFF_H(channel), &off);
+ if (off & LED_FULL) {
+ /* Full OFF bit is set */
+ return 0;
+ }
+
+ pca9685_read_reg(pca, LED_N_ON_H(channel), &on);
+ if (on & LED_FULL) {
+ /* Full ON bit is set */
+ return PCA9685_COUNTER_RANGE;
+ }
+
+ pca9685_read_reg(pca, LED_N_OFF_L(channel), &val);
+ off = ((off & 0xf) << 8) | (val & 0xff);
+ if (!pwm->state.usage_power)
+ return off;
+
+ /* Read ON register to calculate duty cycle of staggered output */
+ if (pca9685_read_reg(pca, LED_N_ON_L(channel), &val)) {
+ /* Reset val to 0 in case reading LED_N_ON_L failed */
+ val = 0;
+ }
+ on = ((on & 0xf) << 8) | (val & 0xff);
+ return (off - on) & (PCA9685_COUNTER_RANGE - 1);
+}
+
+#if IS_ENABLED(CONFIG_GPIOLIB)
+static bool pca9685_pwm_test_and_set_inuse(struct pca9685 *pca, int pwm_idx)
+{
+ bool is_inuse;
+
+ mutex_lock(&pca->lock);
+ if (pwm_idx >= PCA9685_MAXCHAN) {
+ /*
+ * "All LEDs" channel:
+ * pretend already in use if any of the PWMs are requested
+ */
+ if (!bitmap_empty(pca->pwms_inuse, PCA9685_MAXCHAN)) {
+ is_inuse = true;
+ goto out;
+ }
+ } else {
+ /*
+ * Regular channel:
+ * pretend already in use if the "all LEDs" channel is requested
+ */
+ if (test_bit(PCA9685_MAXCHAN, pca->pwms_inuse)) {
+ is_inuse = true;
+ goto out;
+ }
+ }
+ is_inuse = test_and_set_bit(pwm_idx, pca->pwms_inuse);
+out:
+ mutex_unlock(&pca->lock);
+ return is_inuse;
+}
+
+static void pca9685_pwm_clear_inuse(struct pca9685 *pca, int pwm_idx)
+{
+ mutex_lock(&pca->lock);
+ clear_bit(pwm_idx, pca->pwms_inuse);
+ mutex_unlock(&pca->lock);
+}
+
+static int pca9685_pwm_gpio_request(struct gpio_chip *gpio, unsigned int offset)
+{
+ struct pca9685 *pca = gpiochip_get_data(gpio);
+
+ if (pca9685_pwm_test_and_set_inuse(pca, offset))
+ return -EBUSY;
+ pm_runtime_get_sync(pca->chip.dev);
+ return 0;
+}
+
+static int pca9685_pwm_gpio_get(struct gpio_chip *gpio, unsigned int offset)
+{
+ struct pca9685 *pca = gpiochip_get_data(gpio);
+
+ return pca9685_pwm_get_duty(pca, offset) != 0;
+}
+
+static void pca9685_pwm_gpio_set(struct gpio_chip *gpio, unsigned int offset,
+ int value)
+{
+ struct pca9685 *pca = gpiochip_get_data(gpio);
+
+ pca9685_pwm_set_duty(pca, offset, value ? PCA9685_COUNTER_RANGE : 0);
+}
+
+static void pca9685_pwm_gpio_free(struct gpio_chip *gpio, unsigned int offset)
+{
+ struct pca9685 *pca = gpiochip_get_data(gpio);
+
+ pca9685_pwm_set_duty(pca, offset, 0);
+ pm_runtime_put(pca->chip.dev);
+ pca9685_pwm_clear_inuse(pca, offset);
+}
+
+static int pca9685_pwm_gpio_get_direction(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ /* Always out */
+ return GPIO_LINE_DIRECTION_OUT;
+}
+
+static int pca9685_pwm_gpio_direction_input(struct gpio_chip *gpio,
+ unsigned int offset)
+{
+ return -EINVAL;
+}
+
+static int pca9685_pwm_gpio_direction_output(struct gpio_chip *gpio,
+ unsigned int offset, int value)
+{
+ pca9685_pwm_gpio_set(gpio, offset, value);
+
+ return 0;
+}
+
+/*
+ * The PCA9685 has a bit for turning the PWM output full off or on. Some
+ * boards like Intel Galileo actually uses these as normal GPIOs so we
+ * expose a GPIO chip here which can exclusively take over the underlying
+ * PWM channel.
+ */
+static int pca9685_pwm_gpio_probe(struct pca9685 *pca)
+{
+ struct device *dev = pca->chip.dev;
+
+ pca->gpio.label = dev_name(dev);
+ pca->gpio.parent = dev;
+ pca->gpio.request = pca9685_pwm_gpio_request;
+ pca->gpio.free = pca9685_pwm_gpio_free;
+ pca->gpio.get_direction = pca9685_pwm_gpio_get_direction;
+ pca->gpio.direction_input = pca9685_pwm_gpio_direction_input;
+ pca->gpio.direction_output = pca9685_pwm_gpio_direction_output;
+ pca->gpio.get = pca9685_pwm_gpio_get;
+ pca->gpio.set = pca9685_pwm_gpio_set;
+ pca->gpio.base = -1;
+ pca->gpio.ngpio = PCA9685_MAXCHAN;
+ pca->gpio.can_sleep = true;
+
+ return devm_gpiochip_add_data(dev, &pca->gpio, pca);
+}
+#else
+static inline bool pca9685_pwm_test_and_set_inuse(struct pca9685 *pca,
+ int pwm_idx)
+{
+ return false;
+}
+
+static inline void
+pca9685_pwm_clear_inuse(struct pca9685 *pca, int pwm_idx)
+{
+}
+
+static inline int pca9685_pwm_gpio_probe(struct pca9685 *pca)
+{
+ return 0;
+}
+#endif
+
+static void pca9685_set_sleep_mode(struct pca9685 *pca, bool enable)
+{
+ struct device *dev = pca->chip.dev;
+ int err = regmap_update_bits(pca->regmap, PCA9685_MODE1,
+ MODE1_SLEEP, enable ? MODE1_SLEEP : 0);
+ if (err) {
+ dev_err(dev, "regmap_update_bits of register 0x%x failed: %pe\n",
+ PCA9685_MODE1, ERR_PTR(err));
+ return;
+ }
+
+ if (!enable) {
+ /* Wait 500us for the oscillator to be back up */
+ udelay(500);
+ }
+}
+
+static int __pca9685_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+ const struct pwm_state *state)
+{
+ struct pca9685 *pca = to_pca(chip);
+ unsigned long long duty, prescale;
+ unsigned int val = 0;
+
+ if (state->polarity != PWM_POLARITY_NORMAL)
+ return -EINVAL;
+
+ prescale = DIV_ROUND_CLOSEST_ULL(PCA9685_OSC_CLOCK_MHZ * state->period,
+ PCA9685_COUNTER_RANGE * 1000) - 1;
+ if (prescale < PCA9685_PRESCALE_MIN || prescale > PCA9685_PRESCALE_MAX) {
+ dev_err(chip->dev, "pwm not changed: period out of bounds!\n");
+ return -EINVAL;
+ }
+
+ if (!state->enabled) {
+ pca9685_pwm_set_duty(pca, pwm->hwpwm, 0);
+ return 0;
+ }
+
+ pca9685_read_reg(pca, PCA9685_PRESCALE, &val);
+ if (prescale != val) {
+ if (!pca9685_prescaler_can_change(pca, pwm->hwpwm)) {
+ dev_err(chip->dev,
+ "pwm not changed: periods of enabled pwms must match!\n");
+ return -EBUSY;
+ }
+
+ /*
+ * Putting the chip briefly into SLEEP mode
+ * at this point won't interfere with the
+ * pm_runtime framework, because the pm_runtime
+ * state is guaranteed active here.
+ */
+ /* Put chip into sleep mode */
+ pca9685_set_sleep_mode(pca, true);
+
+ /* Change the chip-wide output frequency */
+ pca9685_write_reg(pca, PCA9685_PRESCALE, prescale);
+
+ /* Wake the chip up */
+ pca9685_set_sleep_mode(pca, false);
+ }
+
+ duty = PCA9685_COUNTER_RANGE * state->duty_cycle;
+ duty = DIV_ROUND_UP_ULL(duty, state->period);
+ pca9685_pwm_set_duty(pca, pwm->hwpwm, duty);
+ return 0;
+}
+
+static int pca9685_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+ const struct pwm_state *state)
+{
+ struct pca9685 *pca = to_pca(chip);
+ int ret;
+
+ mutex_lock(&pca->lock);
+ ret = __pca9685_pwm_apply(chip, pwm, state);
+ if (ret == 0) {
+ if (state->enabled)
+ set_bit(pwm->hwpwm, pca->pwms_enabled);
+ else
+ clear_bit(pwm->hwpwm, pca->pwms_enabled);
+ }
+ mutex_unlock(&pca->lock);
+
+ return ret;
+}
+
+static int pca9685_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
+ struct pwm_state *state)
+{
+ struct pca9685 *pca = to_pca(chip);
+ unsigned long long duty;
+ unsigned int val = 0;
+
+ /* Calculate (chip-wide) period from prescale value */
+ pca9685_read_reg(pca, PCA9685_PRESCALE, &val);
+ /*
+ * PCA9685_OSC_CLOCK_MHZ is 25, i.e. an integer divider of 1000.
+ * The following calculation is therefore only a multiplication
+ * and we are not losing precision.
+ */
+ state->period = (PCA9685_COUNTER_RANGE * 1000 / PCA9685_OSC_CLOCK_MHZ) *
+ (val + 1);
+
+ /* The (per-channel) polarity is fixed */
+ state->polarity = PWM_POLARITY_NORMAL;
+
+ if (pwm->hwpwm >= PCA9685_MAXCHAN) {
+ /*
+ * The "all LEDs" channel does not support HW readout
+ * Return 0 and disabled for backwards compatibility
+ */
+ state->duty_cycle = 0;
+ state->enabled = false;
+ return 0;
+ }
+
+ state->enabled = true;
+ duty = pca9685_pwm_get_duty(pca, pwm->hwpwm);
+ state->duty_cycle = DIV_ROUND_DOWN_ULL(duty * state->period, PCA9685_COUNTER_RANGE);
+
+ return 0;
+}
+
+static int pca9685_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct pca9685 *pca = to_pca(chip);
+
+ if (pca9685_pwm_test_and_set_inuse(pca, pwm->hwpwm))
+ return -EBUSY;
+
+ if (pwm->hwpwm < PCA9685_MAXCHAN) {
+ /* PWMs - except the "all LEDs" channel - default to enabled */
+ mutex_lock(&pca->lock);
+ set_bit(pwm->hwpwm, pca->pwms_enabled);
+ mutex_unlock(&pca->lock);
+ }
+
+ pm_runtime_get_sync(chip->dev);
+
+ return 0;
+}
+
+static void pca9685_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct pca9685 *pca = to_pca(chip);
+
+ mutex_lock(&pca->lock);
+ pca9685_pwm_set_duty(pca, pwm->hwpwm, 0);
+ clear_bit(pwm->hwpwm, pca->pwms_enabled);
+ mutex_unlock(&pca->lock);
+
+ pm_runtime_put(chip->dev);
+ pca9685_pwm_clear_inuse(pca, pwm->hwpwm);
+}
+
+static const struct pwm_ops pca9685_pwm_ops = {
+ .apply = pca9685_pwm_apply,
+ .get_state = pca9685_pwm_get_state,
+ .request = pca9685_pwm_request,
+ .free = pca9685_pwm_free,
+ .owner = THIS_MODULE,
+};
+
+static const struct regmap_config pca9685_regmap_i2c_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = PCA9685_NUMREGS,
+ .cache_type = REGCACHE_NONE,
+};
+
+static int pca9685_pwm_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct pca9685 *pca;
+ unsigned int reg;
+ int ret;
+
+ pca = devm_kzalloc(&client->dev, sizeof(*pca), GFP_KERNEL);
+ if (!pca)
+ return -ENOMEM;
+
+ pca->regmap = devm_regmap_init_i2c(client, &pca9685_regmap_i2c_config);
+ if (IS_ERR(pca->regmap)) {
+ ret = PTR_ERR(pca->regmap);
+ dev_err(&client->dev, "Failed to initialize register map: %d\n",
+ ret);
+ return ret;
+ }
+
+ i2c_set_clientdata(client, pca);
+
+ mutex_init(&pca->lock);
+
+ ret = pca9685_read_reg(pca, PCA9685_MODE2, &reg);
+ if (ret)
+ return ret;
+
+ if (device_property_read_bool(&client->dev, "invert"))
+ reg |= MODE2_INVRT;
+ else
+ reg &= ~MODE2_INVRT;
+
+ if (device_property_read_bool(&client->dev, "open-drain"))
+ reg &= ~MODE2_OUTDRV;
+ else
+ reg |= MODE2_OUTDRV;
+
+ ret = pca9685_write_reg(pca, PCA9685_MODE2, reg);
+ if (ret)
+ return ret;
+
+ /* Disable all LED ALLCALL and SUBx addresses to avoid bus collisions */
+ pca9685_read_reg(pca, PCA9685_MODE1, &reg);
+ reg &= ~(MODE1_ALLCALL | MODE1_SUB1 | MODE1_SUB2 | MODE1_SUB3);
+ pca9685_write_reg(pca, PCA9685_MODE1, reg);
+
+ /* Reset OFF/ON registers to POR default */
+ pca9685_write_reg(pca, PCA9685_ALL_LED_OFF_L, 0);
+ pca9685_write_reg(pca, PCA9685_ALL_LED_OFF_H, LED_FULL);
+ pca9685_write_reg(pca, PCA9685_ALL_LED_ON_L, 0);
+ pca9685_write_reg(pca, PCA9685_ALL_LED_ON_H, LED_FULL);
+
+ pca->chip.ops = &pca9685_pwm_ops;
+ /* Add an extra channel for ALL_LED */
+ pca->chip.npwm = PCA9685_MAXCHAN + 1;
+
+ pca->chip.dev = &client->dev;
+
+ ret = pwmchip_add(&pca->chip);
+ if (ret < 0)
+ return ret;
+
+ ret = pca9685_pwm_gpio_probe(pca);
+ if (ret < 0) {
+ pwmchip_remove(&pca->chip);
+ return ret;
+ }
+
+ pm_runtime_enable(&client->dev);
+
+ if (pm_runtime_enabled(&client->dev)) {
+ /*
+ * Although the chip comes out of power-up in the sleep state,
+ * we force it to sleep in case it was woken up before
+ */
+ pca9685_set_sleep_mode(pca, true);
+ pm_runtime_set_suspended(&client->dev);
+ } else {
+ /* Wake the chip up if runtime PM is disabled */
+ pca9685_set_sleep_mode(pca, false);
+ }
+
+ return 0;
+}
+
+static void pca9685_pwm_remove(struct i2c_client *client)
+{
+ struct pca9685 *pca = i2c_get_clientdata(client);
+
+ pwmchip_remove(&pca->chip);
+
+ if (!pm_runtime_enabled(&client->dev)) {
+ /* Put chip in sleep state if runtime PM is disabled */
+ pca9685_set_sleep_mode(pca, true);
+ }
+
+ pm_runtime_disable(&client->dev);
+}
+
+static int __maybe_unused pca9685_pwm_runtime_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct pca9685 *pca = i2c_get_clientdata(client);
+
+ pca9685_set_sleep_mode(pca, true);
+ return 0;
+}
+
+static int __maybe_unused pca9685_pwm_runtime_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct pca9685 *pca = i2c_get_clientdata(client);
+
+ pca9685_set_sleep_mode(pca, false);
+ return 0;
+}
+
+static const struct i2c_device_id pca9685_id[] = {
+ { "pca9685", 0 },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(i2c, pca9685_id);
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id pca9685_acpi_ids[] = {
+ { "INT3492", 0 },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(acpi, pca9685_acpi_ids);
+#endif
+
+#ifdef CONFIG_OF
+static const struct of_device_id pca9685_dt_ids[] = {
+ { .compatible = "nxp,pca9685-pwm", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, pca9685_dt_ids);
+#endif
+
+static const struct dev_pm_ops pca9685_pwm_pm = {
+ SET_RUNTIME_PM_OPS(pca9685_pwm_runtime_suspend,
+ pca9685_pwm_runtime_resume, NULL)
+};
+
+static struct i2c_driver pca9685_i2c_driver = {
+ .driver = {
+ .name = "pca9685-pwm",
+ .acpi_match_table = ACPI_PTR(pca9685_acpi_ids),
+ .of_match_table = of_match_ptr(pca9685_dt_ids),
+ .pm = &pca9685_pwm_pm,
+ },
+ .probe = pca9685_pwm_probe,
+ .remove = pca9685_pwm_remove,
+ .id_table = pca9685_id,
+};
+
+module_i2c_driver(pca9685_i2c_driver);
+
+MODULE_AUTHOR("Steffen Trumtrar <s.trumtrar@pengutronix.de>");
+MODULE_DESCRIPTION("PWM driver for PCA9685");
+MODULE_LICENSE("GPL");