| 1 | |
| 2 | |
| 3 | * PPS generators sysfs support
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| 4 | *
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| 5 | * Copyright (C) 2024 Rodolfo Giometti <[email protected]>
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| 6 |
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| 7 |
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| 8 | #include <linux/device.h>
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| 9 | #include <linux/module.h>
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| 10 | #include <linux/string.h>
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| 11 | #include <linux/pps_gen_kernel.h>
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| 12 |
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| 13 | |
| 14 | * Attribute functions
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| 15 |
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| 16 |
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| 17 | static ssize_t system_show(struct device *dev, struct device_attribute *attr,
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| 18 | char *buf)
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| 19 | {
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| 20 | struct pps_gen_device *pps_gen = dev_get_drvdata(dev);
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| 21 |
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| 22 | return sysfs_emit(buf, "%d\n", pps_gen->info->use_system_clock);
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| 23 | }
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| 24 | static DEVICE_ATTR_RO(system);
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| 25 |
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| 26 | static ssize_t time_show(struct device *dev, struct device_attribute *attr,
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| 27 | char *buf)
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| 28 | {
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| 29 | struct pps_gen_device *pps_gen = dev_get_drvdata(dev);
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| 30 | struct timespec64 time;
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| 31 | int ret;
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| 32 |
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| 33 | ret = pps_gen->info->get_time(pps_gen, &time);
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| 34 | if (ret)
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| 35 | return ret;
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| 36 |
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| 37 | return sysfs_emit(buf, "%llu %09lu\n", time.tv_sec, time.tv_nsec);
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| 38 | }
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| 39 | static DEVICE_ATTR_RO(time);
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| 40 |
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| 41 | static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
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| 42 | const char *buf, size_t count)
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| 43 | {
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| 44 | struct pps_gen_device *pps_gen = dev_get_drvdata(dev);
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| 45 | bool status;
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| 46 | int ret;
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| 47 |
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| 48 | ret = kstrtobool(buf, &status);
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| 49 | if (ret)
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| 50 | return ret;
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| 51 |
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| 52 | ret = pps_gen->info->enable(pps_gen, status);
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| 53 | if (ret)
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| 54 | return ret;
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| 55 | pps_gen->enabled = status;
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| 56 |
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| 57 | return count;
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| 58 | }
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| 59 | static DEVICE_ATTR_WO(enable);
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| 60 |
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| 61 | static struct attribute *pps_gen_attrs[] = {
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| 62 | &dev_attr_enable.attr,
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| 63 | &dev_attr_time.attr,
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| 64 | &dev_attr_system.attr,
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| 65 | NULL,
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| 66 | };
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| 67 |
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| 68 | static const struct attribute_group pps_gen_group = {
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| 69 | .attrs = pps_gen_attrs,
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| 70 | };
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| 71 |
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| 72 | const struct attribute_group *pps_gen_groups[] = {
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| 73 | &pps_gen_group,
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| 74 | NULL,
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| 75 | };
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