^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Industrial I/O - generic interrupt based trigger support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2008-2013 Jonathan Cameron
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/iio/iio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/iio/trigger.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) struct iio_interrupt_trigger_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) unsigned int irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static irqreturn_t iio_interrupt_trigger_poll(int irq, void *private)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) iio_trigger_poll(private);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static const struct iio_trigger_ops iio_interrupt_trigger_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static int iio_interrupt_trigger_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct iio_interrupt_trigger_info *trig_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct iio_trigger *trig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) unsigned long irqflags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct resource *irq_res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) int irq, ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) if (irq_res == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) irqflags = (irq_res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) irq = irq_res->start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) trig = iio_trigger_alloc("irqtrig%d", irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (!trig) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) goto error_ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) trig_info = kzalloc(sizeof(*trig_info), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) if (!trig_info) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) goto error_free_trigger;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) iio_trigger_set_drvdata(trig, trig_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) trig_info->irq = irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) trig->ops = &iio_interrupt_trigger_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) ret = request_irq(irq, iio_interrupt_trigger_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) irqflags, trig->name, trig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) dev_err(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) "request IRQ-%d failed", irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) goto error_free_trig_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) ret = iio_trigger_register(trig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) goto error_release_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) platform_set_drvdata(pdev, trig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) /* First clean up the partly allocated trigger */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) error_release_irq:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) free_irq(irq, trig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) error_free_trig_info:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) kfree(trig_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) error_free_trigger:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) iio_trigger_free(trig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) error_ret:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) static int iio_interrupt_trigger_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) struct iio_trigger *trig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) struct iio_interrupt_trigger_info *trig_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) trig = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) trig_info = iio_trigger_get_drvdata(trig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) iio_trigger_unregister(trig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) free_irq(trig_info->irq, trig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) kfree(trig_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) iio_trigger_free(trig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static struct platform_driver iio_interrupt_trigger_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) .probe = iio_interrupt_trigger_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) .remove = iio_interrupt_trigger_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) .name = "iio_interrupt_trigger",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) module_platform_driver(iio_interrupt_trigger_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) MODULE_DESCRIPTION("Interrupt trigger for the iio subsystem");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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