Thomas Gleixner | d2912cb | 2019-06-04 10:11:33 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 2 | /* |
Jonathan Cameron | d4fd73b | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 3 | * Industrial I/O - generic interrupt based trigger support |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 4 | * |
Jonathan Cameron | d4fd73b | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 5 | * Copyright (c) 2008-2013 Jonathan Cameron |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 6 | */ |
| 7 | |
| 8 | #include <linux/kernel.h> |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/platform_device.h> |
| 11 | #include <linux/interrupt.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 12 | #include <linux/slab.h> |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 13 | |
Jonathan Cameron | 06458e2 | 2012-04-25 15:54:58 +0100 | [diff] [blame] | 14 | #include <linux/iio/iio.h> |
| 15 | #include <linux/iio/trigger.h> |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 16 | |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 17 | |
Jonathan Cameron | d4fd73b | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 18 | struct iio_interrupt_trigger_info { |
Michael Hennerich | a05d7ce | 2010-04-26 10:36:36 +0200 | [diff] [blame] | 19 | unsigned int irq; |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 20 | }; |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 21 | |
Jonathan Cameron | d4fd73b | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 22 | static irqreturn_t iio_interrupt_trigger_poll(int irq, void *private) |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 23 | { |
Peter Meerwald | 398fd22 | 2014-12-06 06:46:00 +0000 | [diff] [blame] | 24 | iio_trigger_poll(private); |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 25 | return IRQ_HANDLED; |
| 26 | } |
| 27 | |
Jonathan Cameron | d4fd73b | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 28 | static int iio_interrupt_trigger_probe(struct platform_device *pdev) |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 29 | { |
Jonathan Cameron | d4fd73b | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 30 | struct iio_interrupt_trigger_info *trig_info; |
Jonathan Cameron | 3c1e02d | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 31 | struct iio_trigger *trig; |
Michael Hennerich | a05d7ce | 2010-04-26 10:36:36 +0200 | [diff] [blame] | 32 | unsigned long irqflags; |
| 33 | struct resource *irq_res; |
Jonathan Cameron | 3c1e02d | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 34 | int irq, ret = 0; |
Michael Hennerich | a05d7ce | 2010-04-26 10:36:36 +0200 | [diff] [blame] | 35 | |
Jonathan Cameron | 3c1e02d | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 36 | irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
Michael Hennerich | a05d7ce | 2010-04-26 10:36:36 +0200 | [diff] [blame] | 37 | |
Jonathan Cameron | 3c1e02d | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 38 | if (irq_res == NULL) |
| 39 | return -ENODEV; |
Michael Hennerich | a05d7ce | 2010-04-26 10:36:36 +0200 | [diff] [blame] | 40 | |
Jonathan Cameron | 3c1e02d | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 41 | irqflags = (irq_res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED; |
Michael Hennerich | a05d7ce | 2010-04-26 10:36:36 +0200 | [diff] [blame] | 42 | |
Jonathan Cameron | 3c1e02d | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 43 | irq = irq_res->start; |
Michael Hennerich | a05d7ce | 2010-04-26 10:36:36 +0200 | [diff] [blame] | 44 | |
Gwendal Grignou | 995071d | 2021-03-09 11:36:13 -0800 | [diff] [blame] | 45 | trig = iio_trigger_alloc(NULL, "irqtrig%d", irq); |
Jonathan Cameron | 3c1e02d | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 46 | if (!trig) { |
| 47 | ret = -ENOMEM; |
| 48 | goto error_ret; |
| 49 | } |
Michael Hennerich | a05d7ce | 2010-04-26 10:36:36 +0200 | [diff] [blame] | 50 | |
Jonathan Cameron | 3c1e02d | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 51 | trig_info = kzalloc(sizeof(*trig_info), GFP_KERNEL); |
| 52 | if (!trig_info) { |
| 53 | ret = -ENOMEM; |
Alison Schofield | 10e840d | 2017-01-19 19:47:38 -0800 | [diff] [blame] | 54 | goto error_free_trigger; |
Jonathan Cameron | 3c1e02d | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 55 | } |
| 56 | iio_trigger_set_drvdata(trig, trig_info); |
| 57 | trig_info->irq = irq; |
Jonathan Cameron | 3c1e02d | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 58 | ret = request_irq(irq, iio_interrupt_trigger_poll, |
| 59 | irqflags, trig->name, trig); |
| 60 | if (ret) { |
| 61 | dev_err(&pdev->dev, |
| 62 | "request IRQ-%d failed", irq); |
| 63 | goto error_free_trig_info; |
| 64 | } |
Michael Hennerich | a05d7ce | 2010-04-26 10:36:36 +0200 | [diff] [blame] | 65 | |
Jonathan Cameron | 3c1e02d | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 66 | ret = iio_trigger_register(trig); |
| 67 | if (ret) |
| 68 | goto error_release_irq; |
| 69 | platform_set_drvdata(pdev, trig); |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 70 | |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 71 | return 0; |
| 72 | |
| 73 | /* First clean up the partly allocated trigger */ |
| 74 | error_release_irq: |
| 75 | free_irq(irq, trig); |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 76 | error_free_trig_info: |
| 77 | kfree(trig_info); |
Alison Schofield | 10e840d | 2017-01-19 19:47:38 -0800 | [diff] [blame] | 78 | error_free_trigger: |
| 79 | iio_trigger_free(trig); |
Jonathan Cameron | 3c1e02d | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 80 | error_ret: |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 81 | return ret; |
| 82 | } |
| 83 | |
Jonathan Cameron | d4fd73b | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 84 | static int iio_interrupt_trigger_remove(struct platform_device *pdev) |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 85 | { |
Jonathan Cameron | 3c1e02d | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 86 | struct iio_trigger *trig; |
Jonathan Cameron | d4fd73b | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 87 | struct iio_interrupt_trigger_info *trig_info; |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 88 | |
Jonathan Cameron | 3c1e02d | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 89 | trig = platform_get_drvdata(pdev); |
| 90 | trig_info = iio_trigger_get_drvdata(trig); |
| 91 | iio_trigger_unregister(trig); |
| 92 | free_irq(trig_info->irq, trig); |
| 93 | kfree(trig_info); |
Alison Schofield | 10e840d | 2017-01-19 19:47:38 -0800 | [diff] [blame] | 94 | iio_trigger_free(trig); |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 95 | |
| 96 | return 0; |
| 97 | } |
| 98 | |
Jonathan Cameron | d4fd73b | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 99 | static struct platform_driver iio_interrupt_trigger_driver = { |
| 100 | .probe = iio_interrupt_trigger_probe, |
| 101 | .remove = iio_interrupt_trigger_remove, |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 102 | .driver = { |
Jonathan Cameron | d4fd73b | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 103 | .name = "iio_interrupt_trigger", |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 104 | }, |
| 105 | }; |
| 106 | |
Jonathan Cameron | d4fd73b | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 107 | module_platform_driver(iio_interrupt_trigger_driver); |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 108 | |
Jonathan Cameron | 0f8c962 | 2012-09-02 21:34:59 +0100 | [diff] [blame] | 109 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
Jonathan Cameron | d4fd73b | 2013-06-02 20:00:00 +0100 | [diff] [blame] | 110 | MODULE_DESCRIPTION("Interrupt trigger for the iio subsystem"); |
Jonathan Cameron | 930bae8 | 2009-08-18 18:06:31 +0100 | [diff] [blame] | 111 | MODULE_LICENSE("GPL v2"); |