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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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6f7f03bda3
Since commit 0166dc11be ("of: make CONFIG_OF user selectable"), it
is possible to test-build any driver which depends on OF on any
architecture by explicitly selecting OF. Therefore depending on
COMPILE_TEST as an alternative is no longer needed.
It is actually better to always build such drivers with OF enabled,
so that the test builds are closer to how each driver will actually be
built on its intended target. Building them without OF may not test
much as the compiler will optimize out potentially large parts of the
code. In the worst case, this could even pop false positive warnings.
Dropping COMPILE_TEST here improves the quality of our testing and
avoids wasting time on non-existent issues.
As a minor optimization, this also lets us drop of_match_ptr(), as we
now know what it will resolve to, we might as well save cpp some work.
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
130 lines
2.7 KiB
C
130 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2017 Sean Young <sean@mess.org>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pwm.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <media/rc-core.h>
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#define DRIVER_NAME "pwm-ir-tx"
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#define DEVICE_NAME "PWM IR Transmitter"
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struct pwm_ir {
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struct pwm_device *pwm;
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unsigned int carrier;
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unsigned int duty_cycle;
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};
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static const struct of_device_id pwm_ir_of_match[] = {
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{ .compatible = "pwm-ir-tx", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, pwm_ir_of_match);
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static int pwm_ir_set_duty_cycle(struct rc_dev *dev, u32 duty_cycle)
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{
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struct pwm_ir *pwm_ir = dev->priv;
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pwm_ir->duty_cycle = duty_cycle;
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return 0;
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}
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static int pwm_ir_set_carrier(struct rc_dev *dev, u32 carrier)
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{
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struct pwm_ir *pwm_ir = dev->priv;
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if (!carrier)
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return -EINVAL;
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pwm_ir->carrier = carrier;
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return 0;
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}
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static int pwm_ir_tx(struct rc_dev *dev, unsigned int *txbuf,
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unsigned int count)
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{
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struct pwm_ir *pwm_ir = dev->priv;
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struct pwm_device *pwm = pwm_ir->pwm;
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struct pwm_state state;
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int i;
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ktime_t edge;
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long delta;
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pwm_init_state(pwm, &state);
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state.period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, pwm_ir->carrier);
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pwm_set_relative_duty_cycle(&state, pwm_ir->duty_cycle, 100);
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edge = ktime_get();
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for (i = 0; i < count; i++) {
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state.enabled = !(i % 2);
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pwm_apply_state(pwm, &state);
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edge = ktime_add_us(edge, txbuf[i]);
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delta = ktime_us_delta(edge, ktime_get());
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if (delta > 0)
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usleep_range(delta, delta + 10);
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}
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state.enabled = false;
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pwm_apply_state(pwm, &state);
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return count;
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}
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static int pwm_ir_probe(struct platform_device *pdev)
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{
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struct pwm_ir *pwm_ir;
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struct rc_dev *rcdev;
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int rc;
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pwm_ir = devm_kmalloc(&pdev->dev, sizeof(*pwm_ir), GFP_KERNEL);
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if (!pwm_ir)
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return -ENOMEM;
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pwm_ir->pwm = devm_pwm_get(&pdev->dev, NULL);
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if (IS_ERR(pwm_ir->pwm))
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return PTR_ERR(pwm_ir->pwm);
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pwm_ir->carrier = 38000;
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pwm_ir->duty_cycle = 50;
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rcdev = devm_rc_allocate_device(&pdev->dev, RC_DRIVER_IR_RAW_TX);
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if (!rcdev)
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return -ENOMEM;
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rcdev->priv = pwm_ir;
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rcdev->driver_name = DRIVER_NAME;
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rcdev->device_name = DEVICE_NAME;
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rcdev->tx_ir = pwm_ir_tx;
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rcdev->s_tx_duty_cycle = pwm_ir_set_duty_cycle;
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rcdev->s_tx_carrier = pwm_ir_set_carrier;
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rc = devm_rc_register_device(&pdev->dev, rcdev);
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if (rc < 0)
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dev_err(&pdev->dev, "failed to register rc device\n");
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return rc;
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}
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static struct platform_driver pwm_ir_driver = {
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.probe = pwm_ir_probe,
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.driver = {
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.name = DRIVER_NAME,
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.of_match_table = pwm_ir_of_match,
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},
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};
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module_platform_driver(pwm_ir_driver);
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MODULE_DESCRIPTION("PWM IR Transmitter");
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MODULE_AUTHOR("Sean Young <sean@mess.org>");
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MODULE_LICENSE("GPL");
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