// SPDX-License-Identifier: GPL-2.0+ /* * Azoteq IQS620A PWM Generator * * Copyright (C) 2019 Jeff LaBundy <[email protected]> * * Limitations: * - The period is fixed to 1 ms and is generated continuously despite changes * to the duty cycle or enable/disable state. * - Changes to the duty cycle or enable/disable state take effect immediately * and may result in a glitch during the period in which the change is made. * - The device cannot generate a 0% duty cycle. For duty cycles below 1 / 256 * ms, the output is disabled and relies upon an external pull-down resistor * to hold the GPIO3/LTX pin low. */ #include <linux/device.h> #include <linux/kernel.h> #include <linux/mfd/iqs62x.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/notifier.h> #include <linux/platform_device.h> #include <linux/pwm.h> #include <linux/regmap.h> #include <linux/slab.h> #define IQS620_PWR_SETTINGS … #define IQS620_PWR_SETTINGS_PWM_OUT … #define IQS620_PWM_DUTY_CYCLE … #define IQS620_PWM_PERIOD_NS … struct iqs620_pwm_private { … }; static inline struct iqs620_pwm_private *iqs620_pwm_from_chip(struct pwm_chip *chip) { … } static int iqs620_pwm_init(struct iqs620_pwm_private *iqs620_pwm, unsigned int duty_scale) { … } static int iqs620_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state) { … } static int iqs620_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, struct pwm_state *state) { … } static int iqs620_pwm_notifier(struct notifier_block *notifier, unsigned long event_flags, void *context) { … } static const struct pwm_ops iqs620_pwm_ops = …; static void iqs620_pwm_notifier_unregister(void *context) { … } static int iqs620_pwm_probe(struct platform_device *pdev) { … } static struct platform_driver iqs620_pwm_platform_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
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