diff options
author | Sean Young <sean@mess.org> | 2023-09-01 17:18:56 +0300 |
---|---|---|
committer | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2023-09-27 10:40:02 +0300 |
commit | 5ce19a501673b72cf57ce1908a29a3c5b3cd30bb (patch) | |
tree | a45876001536014b84d44a0bd7d195dcf260bf14 /drivers/media/rc | |
parent | da923feefead2efc05ef21eb2a3f1058fe4c13ae (diff) | |
download | linux-5ce19a501673b72cf57ce1908a29a3c5b3cd30bb.tar.xz |
media: rc: remove ir-rx51 in favour of generic pwm-ir-tx
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, and in fact the
pwm-ir-tx driver has been compatible with ir-rx51 from the start.
Note that the suspend code in the ir-rx51 driver is unnecessary, since
during transmit, the process is not in interruptable sleep. The process
is not put to sleep until the transmit completes.
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Tested-by: Sicelo A. Mhlongo <absicsz@gmail.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Diffstat (limited to 'drivers/media/rc')
-rw-r--r-- | drivers/media/rc/Kconfig | 10 | ||||
-rw-r--r-- | drivers/media/rc/Makefile | 1 | ||||
-rw-r--r-- | drivers/media/rc/ir-rx51.c | 285 | ||||
-rw-r--r-- | drivers/media/rc/pwm-ir-tx.c | 1 |
4 files changed, 1 insertions, 296 deletions
diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig index 07bdf649c60d..2afe67ffa285 100644 --- a/drivers/media/rc/Kconfig +++ b/drivers/media/rc/Kconfig @@ -338,16 +338,6 @@ config IR_REDRAT3 To compile this driver as a module, choose M here: the module will be called redrat3. -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. - config IR_SERIAL tristate "Homebrew Serial Port Receiver" depends on HAS_IOPORT diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile index a9285266e944..2bca6f7f07bc 100644 --- a/drivers/media/rc/Makefile +++ b/drivers/media/rc/Makefile @@ -43,7 +43,6 @@ obj-$(CONFIG_IR_MTK) += mtk-cir.o obj-$(CONFIG_IR_NUVOTON) += nuvoton-cir.o obj-$(CONFIG_IR_PWM_TX) += pwm-ir-tx.o obj-$(CONFIG_IR_REDRAT3) += redrat3.o -obj-$(CONFIG_IR_RX51) += ir-rx51.o obj-$(CONFIG_IR_SERIAL) += serial_ir.o obj-$(CONFIG_IR_SPI) += ir-spi.o obj-$(CONFIG_IR_STREAMZAP) += streamzap.o diff --git a/drivers/media/rc/ir-rx51.c b/drivers/media/rc/ir-rx51.c deleted file mode 100644 index 13e81bf8005d..000000000000 --- a/drivers/media/rc/ir-rx51.c +++ /dev/null @@ -1,285 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * Copyright (C) 2008 Nokia Corporation - * - * Based on lirc_serial.c - */ -#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> - -#define WBUF_LEN 256 - -struct ir_rx51 { - struct rc_dev *rcdev; - struct pwm_device *pwm; - struct pwm_state state; - struct hrtimer timer; - struct device *dev; - 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) -{ - ir_rx51->state.enabled = true; - pwm_apply_state(ir_rx51->pwm, &ir_rx51->state); -} - -static inline void ir_rx51_off(struct ir_rx51 *ir_rx51) -{ - ir_rx51->state.enabled = false; - pwm_apply_state(ir_rx51->pwm, &ir_rx51->state); -} - -static int init_timing_params(struct ir_rx51 *ir_rx51) -{ - ir_rx51->state.period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, ir_rx51->freq); - pwm_set_relative_duty_cycle(&ir_rx51->state, ir_rx51->duty_cycle, 100); - - 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 */ - - /* - * REVISIT: Adjust latency requirements so the device doesn't go in too - * deep sleep states with pm_qos_add_request(). - */ - - 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); - - /* REVISIT: Remove pm_qos constraint, we can sleep again */ - - 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; - - pwm = pwm_get(&dev->dev, NULL); - if (IS_ERR(pwm)) - return dev_err_probe(&dev->dev, PTR_ERR(pwm), "pwm_get failed\n"); - - /* Use default, in case userspace does not set the carrier */ - ir_rx51.freq = DIV_ROUND_CLOSEST_ULL(pwm_get_period(pwm), NSEC_PER_SEC); - pwm_init_state(pwm, &ir_rx51.state); - 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 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, - .suspend = ir_rx51_suspend, - .resume = ir_rx51_resume, - .driver = { - .name = KBUILD_MODNAME, - .of_match_table = 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"); diff --git a/drivers/media/rc/pwm-ir-tx.c b/drivers/media/rc/pwm-ir-tx.c index 7732054c4621..c5f37c03af9c 100644 --- a/drivers/media/rc/pwm-ir-tx.c +++ b/drivers/media/rc/pwm-ir-tx.c @@ -23,6 +23,7 @@ struct pwm_ir { static const struct of_device_id pwm_ir_of_match[] = { { .compatible = "pwm-ir-tx", }, + { .compatible = "nokia,n900-ir" }, { }, }; MODULE_DEVICE_TABLE(of, pwm_ir_of_match); |