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