// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) 2013 STMicroelectronics Limited * Author: Srinivas Kandagatla <[email protected]> */ #include <linux/kernel.h> #include <linux/clk.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/reset.h> #include <media/rc-core.h> #include <linux/pinctrl/consumer.h> #include <linux/pm_wakeirq.h> struct st_rc_device { … }; /* Registers */ #define IRB_SAMPLE_RATE_COMM … #define IRB_CLOCK_SEL … #define IRB_CLOCK_SEL_STATUS … /* IRB IR/UHF receiver registers */ #define IRB_RX_ON … #define IRB_RX_SYS … #define IRB_RX_INT_EN … #define IRB_RX_INT_STATUS … #define IRB_RX_EN … #define IRB_MAX_SYM_PERIOD … #define IRB_RX_INT_CLEAR … #define IRB_RX_STATUS … #define IRB_RX_NOISE_SUPPR … #define IRB_RX_POLARITY_INV … /* * IRQ set: Enable full FIFO 1 -> bit 3; * Enable overrun IRQ 1 -> bit 2; * Enable last symbol IRQ 1 -> bit 1: * Enable RX interrupt 1 -> bit 0; */ #define IRB_RX_INTS … #define IRB_RX_OVERRUN_INT … /* maximum symbol period (microsecs),timeout to detect end of symbol train */ #define MAX_SYMB_TIME … #define IRB_SAMPLE_FREQ … #define IRB_FIFO_NOT_EMPTY … #define IRB_OVERFLOW … #define IRB_TIMEOUT … #define IR_ST_NAME … static void st_rc_send_lirc_timeout(struct rc_dev *rdev) { … } /* * RX graphical example to better understand the difference between ST IR block * output and standard definition used by LIRC (and most of the world!) * * mark mark * |-IRB_RX_ON-| |-IRB_RX_ON-| * ___ ___ ___ ___ ___ ___ _ * | | | | | | | | | | | | | * | | | | | | space 0 | | | | | | space 1 | * _____| |__| |__| |____________________________| |__| |__| |_____________| * * |--------------- IRB_RX_SYS -------------|------ IRB_RX_SYS -------| * * |------------- encoding bit 0 -----------|---- encoding bit 1 -----| * * ST hardware returns mark (IRB_RX_ON) and total symbol time (IRB_RX_SYS), so * convert to standard mark/space we have to calculate space=(IRB_RX_SYS-mark) * The mark time represents the amount of time the carrier (usually 36-40kHz) * is detected.The above examples shows Pulse Width Modulation encoding where * bit 0 is represented by space>mark. */ static irqreturn_t st_rc_rx_interrupt(int irq, void *data) { … } static int st_rc_hardware_init(struct st_rc_device *dev) { … } static void st_rc_remove(struct platform_device *pdev) { … } static int st_rc_open(struct rc_dev *rdev) { … } static void st_rc_close(struct rc_dev *rdev) { … } static int st_rc_probe(struct platform_device *pdev) { … } #ifdef CONFIG_PM_SLEEP static int st_rc_suspend(struct device *dev) { … } static int st_rc_resume(struct device *dev) { … } #endif static SIMPLE_DEV_PM_OPS(st_rc_pm_ops, st_rc_suspend, st_rc_resume); #ifdef CONFIG_OF static const struct of_device_id st_rc_match[] = …; MODULE_DEVICE_TABLE(of, st_rc_match); #endif static struct platform_driver st_rc_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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