v4.19.13 snapshot.
diff --git a/drivers/pwm/pwm-pca9685.c b/drivers/pwm/pwm-pca9685.c
new file mode 100644
index 0000000..a7eaf96
--- /dev/null
+++ b/drivers/pwm/pwm-pca9685.c
@@ -0,0 +1,594 @@
+/*
+ * 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
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#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>
+
+/*
+ * Because the PCA9685 has only one prescaler per chip, changing the period of
+ * one channel affects the period of all 16 PWM outputs!
+ * However, the ratio between each configured duty cycle and the chip-wide
+ * period remains constant, because the OFF time is set in proportion to the
+ * counter range.
+ */
+
+#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_DEFAULT_PERIOD 5000000 /* Default period_ns = 1/200 Hz */
+#define PCA9685_OSC_CLOCK_MHZ 25 /* Internal oscillator with 25 MHz */
+
+#define PCA9685_NUMREGS 0xFF
+#define PCA9685_MAXCHAN 0x10
+
+#define LED_FULL (1 << 4)
+#define MODE1_SLEEP (1 << 4)
+#define MODE2_INVRT (1 << 4)
+#define MODE2_OUTDRV (1 << 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)))
+
+struct pca9685 {
+ struct pwm_chip chip;
+ struct regmap *regmap;
+ int duty_ns;
+ int period_ns;
+#if IS_ENABLED(CONFIG_GPIOLIB)
+ struct mutex lock;
+ struct gpio_chip gpio;
+#endif
+};
+
+static inline struct pca9685 *to_pca(struct pwm_chip *chip)
+{
+ return container_of(chip, struct pca9685, chip);
+}
+
+#if IS_ENABLED(CONFIG_GPIOLIB)
+static int pca9685_pwm_gpio_request(struct gpio_chip *gpio, unsigned int offset)
+{
+ struct pca9685 *pca = gpiochip_get_data(gpio);
+ struct pwm_device *pwm;
+
+ mutex_lock(&pca->lock);
+
+ pwm = &pca->chip.pwms[offset];
+
+ if (pwm->flags & (PWMF_REQUESTED | PWMF_EXPORTED)) {
+ mutex_unlock(&pca->lock);
+ return -EBUSY;
+ }
+
+ pwm_set_chip_data(pwm, (void *)1);
+
+ mutex_unlock(&pca->lock);
+ pm_runtime_get_sync(pca->chip.dev);
+ return 0;
+}
+
+static bool pca9685_pwm_is_gpio(struct pca9685 *pca, struct pwm_device *pwm)
+{
+ bool is_gpio = false;
+
+ mutex_lock(&pca->lock);
+
+ if (pwm->hwpwm >= PCA9685_MAXCHAN) {
+ unsigned int i;
+
+ /*
+ * Check if any of the GPIOs are requested and in that case
+ * prevent using the "all LEDs" channel.
+ */
+ for (i = 0; i < pca->gpio.ngpio; i++)
+ if (gpiochip_is_requested(&pca->gpio, i)) {
+ is_gpio = true;
+ break;
+ }
+ } else if (pwm_get_chip_data(pwm)) {
+ is_gpio = true;
+ }
+
+ mutex_unlock(&pca->lock);
+ return is_gpio;
+}
+
+static int pca9685_pwm_gpio_get(struct gpio_chip *gpio, unsigned int offset)
+{
+ struct pca9685 *pca = gpiochip_get_data(gpio);
+ struct pwm_device *pwm = &pca->chip.pwms[offset];
+ unsigned int value;
+
+ regmap_read(pca->regmap, LED_N_ON_H(pwm->hwpwm), &value);
+
+ return value & LED_FULL;
+}
+
+static void pca9685_pwm_gpio_set(struct gpio_chip *gpio, unsigned int offset,
+ int value)
+{
+ struct pca9685 *pca = gpiochip_get_data(gpio);
+ struct pwm_device *pwm = &pca->chip.pwms[offset];
+ unsigned int on = value ? LED_FULL : 0;
+
+ /* Clear both OFF registers */
+ regmap_write(pca->regmap, LED_N_OFF_L(pwm->hwpwm), 0);
+ regmap_write(pca->regmap, LED_N_OFF_H(pwm->hwpwm), 0);
+
+ /* Set the full ON bit */
+ regmap_write(pca->regmap, LED_N_ON_H(pwm->hwpwm), on);
+}
+
+static void pca9685_pwm_gpio_free(struct gpio_chip *gpio, unsigned int offset)
+{
+ struct pca9685 *pca = gpiochip_get_data(gpio);
+ struct pwm_device *pwm;
+
+ pca9685_pwm_gpio_set(gpio, offset, 0);
+ pm_runtime_put(pca->chip.dev);
+ mutex_lock(&pca->lock);
+ pwm = &pca->chip.pwms[offset];
+ pwm_set_chip_data(pwm, NULL);
+ mutex_unlock(&pca->lock);
+}
+
+static int pca9685_pwm_gpio_get_direction(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ /* Always out */
+ return 0;
+}
+
+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;
+
+ mutex_init(&pca->lock);
+
+ 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_is_gpio(struct pca9685 *pca,
+ struct pwm_device *pwm)
+{
+ return false;
+}
+
+static inline int pca9685_pwm_gpio_probe(struct pca9685 *pca)
+{
+ return 0;
+}
+#endif
+
+static void pca9685_set_sleep_mode(struct pca9685 *pca, bool enable)
+{
+ regmap_update_bits(pca->regmap, PCA9685_MODE1,
+ MODE1_SLEEP, enable ? MODE1_SLEEP : 0);
+ if (!enable) {
+ /* Wait 500us for the oscillator to be back up */
+ udelay(500);
+ }
+}
+
+static int pca9685_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
+ int duty_ns, int period_ns)
+{
+ struct pca9685 *pca = to_pca(chip);
+ unsigned long long duty;
+ unsigned int reg;
+ int prescale;
+
+ if (period_ns != pca->period_ns) {
+ prescale = DIV_ROUND_CLOSEST(PCA9685_OSC_CLOCK_MHZ * period_ns,
+ PCA9685_COUNTER_RANGE * 1000) - 1;
+
+ if (prescale >= PCA9685_PRESCALE_MIN &&
+ prescale <= PCA9685_PRESCALE_MAX) {
+ /*
+ * 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 */
+ regmap_write(pca->regmap, PCA9685_PRESCALE, prescale);
+
+ /* Wake the chip up */
+ pca9685_set_sleep_mode(pca, false);
+
+ pca->period_ns = period_ns;
+ } else {
+ dev_err(chip->dev,
+ "prescaler not set: period out of bounds!\n");
+ return -EINVAL;
+ }
+ }
+
+ pca->duty_ns = duty_ns;
+
+ if (duty_ns < 1) {
+ if (pwm->hwpwm >= PCA9685_MAXCHAN)
+ reg = PCA9685_ALL_LED_OFF_H;
+ else
+ reg = LED_N_OFF_H(pwm->hwpwm);
+
+ regmap_write(pca->regmap, reg, LED_FULL);
+
+ return 0;
+ }
+
+ if (duty_ns == period_ns) {
+ /* Clear both OFF registers */
+ if (pwm->hwpwm >= PCA9685_MAXCHAN)
+ reg = PCA9685_ALL_LED_OFF_L;
+ else
+ reg = LED_N_OFF_L(pwm->hwpwm);
+
+ regmap_write(pca->regmap, reg, 0x0);
+
+ if (pwm->hwpwm >= PCA9685_MAXCHAN)
+ reg = PCA9685_ALL_LED_OFF_H;
+ else
+ reg = LED_N_OFF_H(pwm->hwpwm);
+
+ regmap_write(pca->regmap, reg, 0x0);
+
+ /* Set the full ON bit */
+ if (pwm->hwpwm >= PCA9685_MAXCHAN)
+ reg = PCA9685_ALL_LED_ON_H;
+ else
+ reg = LED_N_ON_H(pwm->hwpwm);
+
+ regmap_write(pca->regmap, reg, LED_FULL);
+
+ return 0;
+ }
+
+ duty = PCA9685_COUNTER_RANGE * (unsigned long long)duty_ns;
+ duty = DIV_ROUND_UP_ULL(duty, period_ns);
+
+ if (pwm->hwpwm >= PCA9685_MAXCHAN)
+ reg = PCA9685_ALL_LED_OFF_L;
+ else
+ reg = LED_N_OFF_L(pwm->hwpwm);
+
+ regmap_write(pca->regmap, reg, (int)duty & 0xff);
+
+ if (pwm->hwpwm >= PCA9685_MAXCHAN)
+ reg = PCA9685_ALL_LED_OFF_H;
+ else
+ reg = LED_N_OFF_H(pwm->hwpwm);
+
+ regmap_write(pca->regmap, reg, ((int)duty >> 8) & 0xf);
+
+ /* Clear the full ON bit, otherwise the set OFF time has no effect */
+ if (pwm->hwpwm >= PCA9685_MAXCHAN)
+ reg = PCA9685_ALL_LED_ON_H;
+ else
+ reg = LED_N_ON_H(pwm->hwpwm);
+
+ regmap_write(pca->regmap, reg, 0);
+
+ return 0;
+}
+
+static int pca9685_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct pca9685 *pca = to_pca(chip);
+ unsigned int reg;
+
+ /*
+ * The PWM subsystem does not support a pre-delay.
+ * So, set the ON-timeout to 0
+ */
+ if (pwm->hwpwm >= PCA9685_MAXCHAN)
+ reg = PCA9685_ALL_LED_ON_L;
+ else
+ reg = LED_N_ON_L(pwm->hwpwm);
+
+ regmap_write(pca->regmap, reg, 0);
+
+ if (pwm->hwpwm >= PCA9685_MAXCHAN)
+ reg = PCA9685_ALL_LED_ON_H;
+ else
+ reg = LED_N_ON_H(pwm->hwpwm);
+
+ regmap_write(pca->regmap, reg, 0);
+
+ /*
+ * Clear the full-off bit.
+ * It has precedence over the others and must be off.
+ */
+ if (pwm->hwpwm >= PCA9685_MAXCHAN)
+ reg = PCA9685_ALL_LED_OFF_H;
+ else
+ reg = LED_N_OFF_H(pwm->hwpwm);
+
+ regmap_update_bits(pca->regmap, reg, LED_FULL, 0x0);
+
+ return 0;
+}
+
+static void pca9685_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct pca9685 *pca = to_pca(chip);
+ unsigned int reg;
+
+ if (pwm->hwpwm >= PCA9685_MAXCHAN)
+ reg = PCA9685_ALL_LED_OFF_H;
+ else
+ reg = LED_N_OFF_H(pwm->hwpwm);
+
+ regmap_write(pca->regmap, reg, LED_FULL);
+
+ /* Clear the LED_OFF counter. */
+ if (pwm->hwpwm >= PCA9685_MAXCHAN)
+ reg = PCA9685_ALL_LED_OFF_L;
+ else
+ reg = LED_N_OFF_L(pwm->hwpwm);
+
+ regmap_write(pca->regmap, reg, 0x0);
+}
+
+static int pca9685_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct pca9685 *pca = to_pca(chip);
+
+ if (pca9685_pwm_is_gpio(pca, pwm))
+ return -EBUSY;
+ pm_runtime_get_sync(chip->dev);
+
+ return 0;
+}
+
+static void pca9685_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ pca9685_pwm_disable(chip, pwm);
+ pm_runtime_put(chip->dev);
+}
+
+static const struct pwm_ops pca9685_pwm_ops = {
+ .enable = pca9685_pwm_enable,
+ .disable = pca9685_pwm_disable,
+ .config = pca9685_pwm_config,
+ .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;
+ int ret;
+ int mode2;
+
+ 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;
+ }
+ pca->duty_ns = 0;
+ pca->period_ns = PCA9685_DEFAULT_PERIOD;
+
+ i2c_set_clientdata(client, pca);
+
+ regmap_read(pca->regmap, PCA9685_MODE2, &mode2);
+
+ if (device_property_read_bool(&client->dev, "invert"))
+ mode2 |= MODE2_INVRT;
+ else
+ mode2 &= ~MODE2_INVRT;
+
+ if (device_property_read_bool(&client->dev, "open-drain"))
+ mode2 &= ~MODE2_OUTDRV;
+ else
+ mode2 |= MODE2_OUTDRV;
+
+ regmap_write(pca->regmap, PCA9685_MODE2, mode2);
+
+ /* clear all "full off" bits */
+ regmap_write(pca->regmap, PCA9685_ALL_LED_OFF_L, 0);
+ regmap_write(pca->regmap, PCA9685_ALL_LED_OFF_H, 0);
+
+ pca->chip.ops = &pca9685_pwm_ops;
+ /* add an extra channel for ALL_LED */
+ pca->chip.npwm = PCA9685_MAXCHAN + 1;
+
+ pca->chip.dev = &client->dev;
+ pca->chip.base = -1;
+
+ 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;
+ }
+
+ /* the chip comes out of power-up in the active state */
+ pm_runtime_set_active(&client->dev);
+ /*
+ * enable will put the chip into suspend, which is what we
+ * want as all outputs are disabled at this point
+ */
+ pm_runtime_enable(&client->dev);
+
+ return 0;
+}
+
+static int pca9685_pwm_remove(struct i2c_client *client)
+{
+ struct pca9685 *pca = i2c_get_clientdata(client);
+ int ret;
+
+ ret = pwmchip_remove(&pca->chip);
+ if (ret)
+ return ret;
+ pm_runtime_disable(&client->dev);
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int 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 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;
+}
+#endif
+
+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");