mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Uwe Kleine-König](/assets/img/avatar_default.png)
After commitb8a1a4cd5a
("i2c: Provide a temporary .probe_new() call-back type"), all drivers being converted to .probe_new() and then03c835f498
("i2c: Switch .probe() to not take an id parameter") convert back to (the new) .probe() to be able to eventually drop .probe_new() from struct i2c_driver. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
677 lines
18 KiB
C
677 lines
18 KiB
C
// 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)
|
|
{
|
|
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, ®);
|
|
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 &= ~(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");
|