On Wednesday 01 November 2017 11:55:33 Sean Young wrote:
> The ir-rx51 is a pwm-based TX driver specific to the n900. This can be
> handled entirely by the generic pwm-ir-tx driver.
>
> Note that the suspend code in the ir-rx51 driver is unnecessary, since
> during transmit, the current process is not in interruptable sleep. The
> process is not put to sleep until the transmit completes.
Hello, have you tested this patch that IR transmitter is still working
fine on the real Nokia N900 device?
> Cc: Ivaylo Dimitrov <ivo.g.dimitrov...@gmail.com>
> Cc: Pali Rohár <pali.ro...@gmail.com>
> Cc: Pavel Machek <pa...@ucw.cz>
> Cc: Timo Kokkonen <timo.t.kokko...@iki.fi>
> Signed-off-by: Sean Young <s...@mess.org>
> ---
> arch/arm/boot/dts/omap3-n900.dts | 2 +-
> drivers/media/rc/Kconfig | 10 --
> drivers/media/rc/Makefile | 1 -
> drivers/media/rc/ir-rx51.c | 316
> ---------------------------------------
> 4 files changed, 1 insertion(+), 328 deletions(-)
> delete mode 100644 drivers/media/rc/ir-rx51.c
>
> diff --git a/arch/arm/boot/dts/omap3-n900.dts
> b/arch/arm/boot/dts/omap3-n900.dts
> index 4acd32a1c4ef..fccd2b119c0a 100644
> --- a/arch/arm/boot/dts/omap3-n900.dts
> +++ b/arch/arm/boot/dts/omap3-n900.dts
> @@ -152,7 +152,7 @@
> };
>
> ir: n900-ir {
> - compatible = "nokia,n900-ir";
> + compatible = "pwm-ir-tx";
> pwms = <&pwm9 0 26316 0>; /* 38000 Hz */
> };
>
> diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
> index 0f863822889e..354ee5224758 100644
> --- a/drivers/media/rc/Kconfig
> +++ b/drivers/media/rc/Kconfig
> @@ -353,16 +353,6 @@ config IR_TTUSBIR
> To compile this driver as a module, choose M here: the module will
> be called ttusbir.
>
> -config IR_RX51
> - tristate "Nokia N900 IR transmitter diode"
> - depends on (OMAP_DM_TIMER && PWM_OMAP_DMTIMER && ARCH_OMAP2PLUS ||
> COMPILE_TEST) && RC_CORE
> - ---help---
> - Say Y or M here if you want to enable support for the IR
> - transmitter diode built in the Nokia N900 (RX51) device.
> -
> - The driver uses omap DM timers for generating the carrier
> - wave and pulses.
> -
> source "drivers/media/rc/img-ir/Kconfig"
>
> config RC_LOOPBACK
> diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile
> index a1ef86767aef..59b99a2dc2d4 100644
> --- a/drivers/media/rc/Makefile
> +++ b/drivers/media/rc/Makefile
> @@ -25,7 +25,6 @@ obj-$(CONFIG_IR_MESON) += meson-ir.o
> obj-$(CONFIG_IR_NUVOTON) += nuvoton-cir.o
> obj-$(CONFIG_IR_ENE) += ene_ir.o
> obj-$(CONFIG_IR_REDRAT3) += redrat3.o
> -obj-$(CONFIG_IR_RX51) += ir-rx51.o
> obj-$(CONFIG_IR_SPI) += ir-spi.o
> obj-$(CONFIG_IR_STREAMZAP) += streamzap.o
> obj-$(CONFIG_IR_WINBOND_CIR) += winbond-cir.o
> diff --git a/drivers/media/rc/ir-rx51.c b/drivers/media/rc/ir-rx51.c
> deleted file mode 100644
> index 49265f02e772..000000000000
> --- a/drivers/media/rc/ir-rx51.c
> +++ /dev/null
> @@ -1,316 +0,0 @@
> -/*
> - * Copyright (C) 2008 Nokia Corporation
> - *
> - * Based on lirc_serial.c
> - *
> - * This program is free software; you can redistribute it and/or modify
> - * it under the terms of the GNU General Public License as published by
> - * the Free Software Foundation; either version 2 of the License, or
> - * (at your option) any later version.
> - *
> - * 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.
> - */
> -#include <linux/clk.h>
> -#include <linux/module.h>
> -#include <linux/platform_device.h>
> -#include <linux/wait.h>
> -#include <linux/pwm.h>
> -#include <linux/of.h>
> -#include <linux/hrtimer.h>
> -
> -#include <media/rc-core.h>
> -#include <linux/platform_data/media/ir-rx51.h>
> -
> -#define WBUF_LEN 256
> -
> -struct ir_rx51 {
> - struct rc_dev *rcdev;
> - struct pwm_device *pwm;
> - struct hrtimer timer;
> - struct device *dev;
> - struct ir_rx51_platform_data *pdata;
> - wait_queue_head_t wqueue;
> -
> - unsigned int freq; /* carrier frequency */
> - unsigned int duty_cycle; /* carrier duty cycle */
> - int wbuf[WBUF_LEN];
> - int wbuf_index;
> - unsigned long device_is_open;
> -};
> -
> -static inline void ir_rx51_on(struct ir_rx51 *ir_rx51)
> -{
> - pwm_enable(ir_rx51->pwm);
> -}
> -
> -static inline void ir_rx51_off(struct ir_rx51 *ir_rx51)
> -{
> - pwm_disable(ir_rx51->pwm);
> -}
> -
> -static int init_timing_params(struct ir_rx51 *ir_rx51)
> -{
> - struct pwm_device *pwm = ir_rx51->pwm;
> - int duty, period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, ir_rx51->freq);
> -
> - duty = DIV_ROUND_CLOSEST(ir_rx51->duty_cycle * period, 100);
> -
> - pwm_config(pwm, duty, period);
> -
> - return 0;
> -}
> -
> -static enum hrtimer_restart ir_rx51_timer_cb(struct hrtimer *timer)
> -{
> - struct ir_rx51 *ir_rx51 = container_of(timer, struct ir_rx51, timer);
> - ktime_t now;
> -
> - if (ir_rx51->wbuf_index < 0) {
> - dev_err_ratelimited(ir_rx51->dev,
> - "BUG wbuf_index has value of %i\n",
> - ir_rx51->wbuf_index);
> - goto end;
> - }
> -
> - /*
> - * If we happen to hit an odd latency spike, loop through the
> - * pulses until we catch up.
> - */
> - do {
> - u64 ns;
> -
> - if (ir_rx51->wbuf_index >= WBUF_LEN)
> - goto end;
> - if (ir_rx51->wbuf[ir_rx51->wbuf_index] == -1)
> - goto end;
> -
> - if (ir_rx51->wbuf_index % 2)
> - ir_rx51_off(ir_rx51);
> - else
> - ir_rx51_on(ir_rx51);
> -
> - ns = US_TO_NS(ir_rx51->wbuf[ir_rx51->wbuf_index]);
> - hrtimer_add_expires_ns(timer, ns);
> -
> - ir_rx51->wbuf_index++;
> -
> - now = timer->base->get_time();
> -
> - } while (hrtimer_get_expires_tv64(timer) < now);
> -
> - return HRTIMER_RESTART;
> -end:
> - /* Stop TX here */
> - ir_rx51_off(ir_rx51);
> - ir_rx51->wbuf_index = -1;
> -
> - wake_up_interruptible(&ir_rx51->wqueue);
> -
> - return HRTIMER_NORESTART;
> -}
> -
> -static int ir_rx51_tx(struct rc_dev *dev, unsigned int *buffer,
> - unsigned int count)
> -{
> - struct ir_rx51 *ir_rx51 = dev->priv;
> -
> - if (count > WBUF_LEN)
> - return -EINVAL;
> -
> - memcpy(ir_rx51->wbuf, buffer, count * sizeof(unsigned int));
> -
> - /* Wait any pending transfers to finish */
> - wait_event_interruptible(ir_rx51->wqueue, ir_rx51->wbuf_index < 0);
> -
> - init_timing_params(ir_rx51);
> - if (count < WBUF_LEN)
> - ir_rx51->wbuf[count] = -1; /* Insert termination mark */
> -
> - /*
> - * Adjust latency requirements so the device doesn't go in too
> - * deep sleep states
> - */
> - ir_rx51->pdata->set_max_mpu_wakeup_lat(ir_rx51->dev, 50);
> -
> - ir_rx51_on(ir_rx51);
> - ir_rx51->wbuf_index = 1;
> - hrtimer_start(&ir_rx51->timer,
> - ns_to_ktime(US_TO_NS(ir_rx51->wbuf[0])),
> - HRTIMER_MODE_REL);
> - /*
> - * Don't return back to the userspace until the transfer has
> - * finished
> - */
> - wait_event_interruptible(ir_rx51->wqueue, ir_rx51->wbuf_index < 0);
> -
> - /* We can sleep again */
> - ir_rx51->pdata->set_max_mpu_wakeup_lat(ir_rx51->dev, -1);
> -
> - return count;
> -}
> -
> -static int ir_rx51_open(struct rc_dev *dev)
> -{
> - struct ir_rx51 *ir_rx51 = dev->priv;
> -
> - if (test_and_set_bit(1, &ir_rx51->device_is_open))
> - return -EBUSY;
> -
> - ir_rx51->pwm = pwm_get(ir_rx51->dev, NULL);
> - if (IS_ERR(ir_rx51->pwm)) {
> - int res = PTR_ERR(ir_rx51->pwm);
> -
> - dev_err(ir_rx51->dev, "pwm_get failed: %d\n", res);
> - return res;
> - }
> -
> - return 0;
> -}
> -
> -static void ir_rx51_release(struct rc_dev *dev)
> -{
> - struct ir_rx51 *ir_rx51 = dev->priv;
> -
> - hrtimer_cancel(&ir_rx51->timer);
> - ir_rx51_off(ir_rx51);
> - pwm_put(ir_rx51->pwm);
> -
> - clear_bit(1, &ir_rx51->device_is_open);
> -}
> -
> -static struct ir_rx51 ir_rx51 = {
> - .duty_cycle = 50,
> - .wbuf_index = -1,
> -};
> -
> -static int ir_rx51_set_duty_cycle(struct rc_dev *dev, u32 duty)
> -{
> - struct ir_rx51 *ir_rx51 = dev->priv;
> -
> - ir_rx51->duty_cycle = duty;
> -
> - return 0;
> -}
> -
> -static int ir_rx51_set_tx_carrier(struct rc_dev *dev, u32 carrier)
> -{
> - struct ir_rx51 *ir_rx51 = dev->priv;
> -
> - if (carrier > 500000 || carrier < 20000)
> - return -EINVAL;
> -
> - ir_rx51->freq = carrier;
> -
> - return 0;
> -}
> -
> -#ifdef CONFIG_PM
> -
> -static int ir_rx51_suspend(struct platform_device *dev, pm_message_t state)
> -{
> - /*
> - * In case the device is still open, do not suspend. Normally
> - * this should not be a problem as lircd only keeps the device
> - * open only for short periods of time. We also don't want to
> - * get involved with race conditions that might happen if we
> - * were in a middle of a transmit. Thus, we defer any suspend
> - * actions until transmit has completed.
> - */
> - if (test_and_set_bit(1, &ir_rx51.device_is_open))
> - return -EAGAIN;
> -
> - clear_bit(1, &ir_rx51.device_is_open);
> -
> - return 0;
> -}
> -
> -static int ir_rx51_resume(struct platform_device *dev)
> -{
> - return 0;
> -}
> -
> -#else
> -
> -#define ir_rx51_suspend NULL
> -#define ir_rx51_resume NULL
> -
> -#endif /* CONFIG_PM */
> -
> -static int ir_rx51_probe(struct platform_device *dev)
> -{
> - struct pwm_device *pwm;
> - struct rc_dev *rcdev;
> -
> - ir_rx51.pdata = dev->dev.platform_data;
> -
> - if (!ir_rx51.pdata) {
> - dev_err(&dev->dev, "Platform Data is missing\n");
> - return -ENXIO;
> - }
> -
> - pwm = pwm_get(&dev->dev, NULL);
> - if (IS_ERR(pwm)) {
> - int err = PTR_ERR(pwm);
> -
> - if (err != -EPROBE_DEFER)
> - dev_err(&dev->dev, "pwm_get failed: %d\n", err);
> - return err;
> - }
> -
> - /* Use default, in case userspace does not set the carrier */
> - ir_rx51.freq = DIV_ROUND_CLOSEST(pwm_get_period(pwm), NSEC_PER_SEC);
> - pwm_put(pwm);
> -
> - hrtimer_init(&ir_rx51.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
> - ir_rx51.timer.function = ir_rx51_timer_cb;
> -
> - ir_rx51.dev = &dev->dev;
> -
> - rcdev = devm_rc_allocate_device(&dev->dev, RC_DRIVER_IR_RAW_TX);
> - if (!rcdev)
> - return -ENOMEM;
> -
> - rcdev->priv = &ir_rx51;
> - rcdev->open = ir_rx51_open;
> - rcdev->close = ir_rx51_release;
> - rcdev->tx_ir = ir_rx51_tx;
> - rcdev->s_tx_duty_cycle = ir_rx51_set_duty_cycle;
> - rcdev->s_tx_carrier = ir_rx51_set_tx_carrier;
> - rcdev->driver_name = KBUILD_MODNAME;
> -
> - ir_rx51.rcdev = rcdev;
> -
> - return devm_rc_register_device(&dev->dev, ir_rx51.rcdev);
> -}
> -
> -static int ir_rx51_remove(struct platform_device *dev)
> -{
> - return 0;
> -}
> -
> -static const struct of_device_id ir_rx51_match[] = {
> - {
> - .compatible = "nokia,n900-ir",
> - },
> - {},
> -};
> -MODULE_DEVICE_TABLE(of, ir_rx51_match);
> -
> -static struct platform_driver ir_rx51_platform_driver = {
> - .probe = ir_rx51_probe,
> - .remove = ir_rx51_remove,
> - .suspend = ir_rx51_suspend,
> - .resume = ir_rx51_resume,
> - .driver = {
> - .name = KBUILD_MODNAME,
> - .of_match_table = of_match_ptr(ir_rx51_match),
> - },
> -};
> -module_platform_driver(ir_rx51_platform_driver);
> -
> -MODULE_DESCRIPTION("IR TX driver for Nokia RX51");
> -MODULE_AUTHOR("Nokia Corporation");
> -MODULE_LICENSE("GPL");
--
Pali Rohár
pali.ro...@gmail.com
