projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 4b60779d MF |
1 | /* |
| 2 | * Simple gptimers example | |
| 3 | * http://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:drivers:gptimers | |
| 4 | * | |
| 5 | * Copyright 2007-2009 Analog Devices Inc. | |
| 6 | * | |
| 7 | * Licensed under the GPL-2 or later. | |
| 8 | */ | |
| 9 | ||
| 10 | #include <linux/interrupt.h> | |
| 11 | #include <linux/module.h> | |
| 12 | ||
| 13 | #include <asm/gptimers.h> | |
| 14 | #include <asm/portmux.h> | |
| 15 | ||
| 16 | /* ... random driver includes ... */ | |
| 17 | ||
| 18 | #define DRIVER_NAME "gptimer_example" | |
| 19 | ||
| 4ae711f4 CG |
20 | #ifdef IRQ_TIMER5 |
| 21 | #define SAMPLE_IRQ_TIMER IRQ_TIMER5 | |
| 22 | #else | |
| 23 | #define SAMPLE_IRQ_TIMER IRQ_TIMER2 | |
| 24 | #endif | |
| 25 | ||
| 4b60779d MF |
26 | struct gptimer_data { |
| 27 | uint32_t period, width; | |
| 28 | }; | |
| 29 | static struct gptimer_data data; | |
| 30 | ||
| 31 | /* ... random driver state ... */ | |
| 32 | ||
| 33 | static irqreturn_t gptimer_example_irq(int irq, void *dev_id) | |
| 34 | { | |
| 35 | struct gptimer_data *data = dev_id; | |
| 36 | ||
| 37 | /* make sure it was our timer which caused the interrupt */ | |
| 38 | if (!get_gptimer_intr(TIMER5_id)) | |
| 39 | return IRQ_NONE; | |
| 40 | ||
| 41 | /* read the width/period values that were captured for the waveform */ | |
| 42 | data->width = get_gptimer_pwidth(TIMER5_id); | |
| 43 | data->period = get_gptimer_period(TIMER5_id); | |
| 44 | ||
| 45 | /* acknowledge the interrupt */ | |
| 46 | clear_gptimer_intr(TIMER5_id); | |
| 47 | ||
| 48 | /* tell the upper layers we took care of things */ | |
| 49 | return IRQ_HANDLED; | |
| 50 | } | |
| 51 | ||
| 52 | /* ... random driver code ... */ | |
| 53 | ||
| 54 | static int __init gptimer_example_init(void) | |
| 55 | { | |
| 56 | int ret; | |
| 57 | ||
| 58 | /* grab the peripheral pins */ | |
| 59 | ret = peripheral_request(P_TMR5, DRIVER_NAME); | |
| 60 | if (ret) { | |
| 61 | printk(KERN_NOTICE DRIVER_NAME ": peripheral request failed\n"); | |
| 62 | return ret; | |
| 63 | } | |
| 64 | ||
| 65 | /* grab the IRQ for the timer */ | |
| 4ae711f4 CG |
66 | ret = request_irq(SAMPLE_IRQ_TIMER, gptimer_example_irq, |
| 67 | IRQF_SHARED, DRIVER_NAME, &data); | |
| 4b60779d MF |
68 | if (ret) { |
| 69 | printk(KERN_NOTICE DRIVER_NAME ": IRQ request failed\n"); | |
| 70 | peripheral_free(P_TMR5); | |
| 71 | return ret; | |
| 72 | } | |
| 73 | ||
| 74 | /* setup the timer and enable it */ | |
| 4ae711f4 CG |
75 | set_gptimer_config(TIMER5_id, |
| 76 | WDTH_CAP | PULSE_HI | PERIOD_CNT | IRQ_ENA); | |
| 4b60779d MF |
77 | enable_gptimers(TIMER5bit); |
| 78 | ||
| 79 | return 0; | |
| 80 | } | |
| 81 | module_init(gptimer_example_init); | |
| 82 | ||
| 83 | static void __exit gptimer_example_exit(void) | |
| 84 | { | |
| 85 | disable_gptimers(TIMER5bit); | |
| 4ae711f4 | 86 | free_irq(SAMPLE_IRQ_TIMER, &data); |
| 4b60779d MF |
87 | peripheral_free(P_TMR5); |
| 88 | } | |
| 89 | module_exit(gptimer_example_exit); | |
| 90 | ||
| 91 | MODULE_LICENSE("BSD"); |