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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 05:48:40 +00:00
![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Maintainer Updates * Add 3 designated reviewers for IIO. Lars, Peter and Hartmut have been actively reviewing a lot of patches for a while now so this reflects the status quo. These three are probably the only reason I keep my head above the water! New drivers and device support * max5821 DAC * Rockchip SARADC * TI ADC128S052 ADC * BMC150 Accelerometer * exynos ADC driver gains support for s3c24xx and s3c64xx parts. * kxcjk-1013 gainst range control and runtime PM support to drive down it's power usage. Driver removals * Drop ad5930, ad99850, ad9852, ad9910 and ad9951 drivers on the simple basis that they drivers just provided a register write function with no compliant user space ABI whatsoever. Much better to drop them and start again for these in the fullness of time. Core Enhancements * Join together neighbouring elements in the demux units that feeds the binary interfaces. This cuts down on the number of individual copies needed when splitting out individual channels from the incoming channel scans. * Other demux related cleanups such as using roundup instead of a local implementation. Cleanups * Drop an unnecessary double setting of the owner field in xilinx adc. * Some more patches to use managed (devm) interfaces to cut down on complexity of removal code. * adis16060 coding style fixlets. * Fix some incorrect error returns in the Xilinx ADC driver. * Coding style fixlets for various accelerometer drivers. * Some sparse warning fixes to do with endianness and sign of variables. * Fix an incorrect and entirely pointless use of sizeof on a dynamic pointer in hid-sensor-magn-3d by dropping the relevant code. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAABAgAGBQJT86rcAAoJEFSFNJnE9BaIhKoQAKJ+pIpOb36k1Kjppe0PgQjG 0YCUJEte6z9RSM3s7Z47B6gm165MerYpscQW0GvTKCaxVB0GcnbE9IPYROIfZo+6 QIQbMHe9J7mYW0+qtHBxY5ItOCcVUMSwGfbXar8nFVS6266OcXP+HAau4U9WweKt GmYMuTxLdzm5JYh6C+ljv2PaRZ6B9IascF+YCrDnvkL34ojq7YpLA4QE0GcJlI4s Fz3k7UE0ckrrkAytCumjJC/zn/BSntzyUu2ctN5Z8VO6WeMyuSyFo8uxhzhoyjtm NnISm89Y2Dn5iBtb+QA/6OfOEd9MtjbALauozj70u6ONL0sYdbayNcHvhUU6lnNu hge8xlKS5MhCKtMFZ02qJM0MD/cajNt77m/QYaOoZlbuFPbREI12PtsHah6F7SJT Ad3YQ8T8rT+wzq45EqlqYE863H1OMMJulyjqUom0I8LgTijz+Exs6HWs4/qMhz6V 3T3ZwVoWSnhE4/yyRJFB/xD1P/uZIUGBP30EwlKxaiDmdxJ5X69Vlo9+AuecS3bq hRQvHSNFQG4cZEaDf/fzKGITkLv7V3oxqhg7yiSFtocj9kbF/6KyqgrUl5y7AZBL ZyW9m8OLr0K4ns8sKtRLeg9UmQ0Jxs2L1OvYtPSECAioMmMjLdij4Xt5U4Jv5ifC STIMv21b8mmNV9N8SdSo =zqHo -----END PGP SIGNATURE----- Merge tag 'iio-for-3.18a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into work-next Jonathan writes: 1st round of new IIO drivers, functionality and cleanups for the 3.18 cycle. Maintainer Updates * Add 3 designated reviewers for IIO. Lars, Peter and Hartmut have been actively reviewing a lot of patches for a while now so this reflects the status quo. These three are probably the only reason I keep my head above the water! New drivers and device support * max5821 DAC * Rockchip SARADC * TI ADC128S052 ADC * BMC150 Accelerometer * exynos ADC driver gains support for s3c24xx and s3c64xx parts. * kxcjk-1013 gainst range control and runtime PM support to drive down it's power usage. Driver removals * Drop ad5930, ad99850, ad9852, ad9910 and ad9951 drivers on the simple basis that they drivers just provided a register write function with no compliant user space ABI whatsoever. Much better to drop them and start again for these in the fullness of time. Core Enhancements * Join together neighbouring elements in the demux units that feeds the binary interfaces. This cuts down on the number of individual copies needed when splitting out individual channels from the incoming channel scans. * Other demux related cleanups such as using roundup instead of a local implementation. Cleanups * Drop an unnecessary double setting of the owner field in xilinx adc. * Some more patches to use managed (devm) interfaces to cut down on complexity of removal code. * adis16060 coding style fixlets. * Fix some incorrect error returns in the Xilinx ADC driver. * Coding style fixlets for various accelerometer drivers. * Some sparse warning fixes to do with endianness and sign of variables. * Fix an incorrect and entirely pointless use of sizeof on a dynamic pointer in hid-sensor-magn-3d by dropping the relevant code.
1109 lines
28 KiB
C
1109 lines
28 KiB
C
/* The industrial I/O core
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*
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* Copyright (c) 2008 Jonathan Cameron
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* Handling of buffer allocation / resizing.
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*
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*
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* Things to look at here.
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* - Better memory allocation techniques?
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* - Alternative access techniques?
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*/
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/cdev.h>
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#include <linux/slab.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/iio/iio.h>
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#include "iio_core.h"
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#include <linux/iio/sysfs.h>
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#include <linux/iio/buffer.h>
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static const char * const iio_endian_prefix[] = {
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[IIO_BE] = "be",
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[IIO_LE] = "le",
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};
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static bool iio_buffer_is_active(struct iio_buffer *buf)
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{
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return !list_empty(&buf->buffer_list);
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}
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static bool iio_buffer_data_available(struct iio_buffer *buf)
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{
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return buf->access->data_available(buf);
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}
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/**
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* iio_buffer_read_first_n_outer() - chrdev read for buffer access
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*
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* This function relies on all buffer implementations having an
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* iio_buffer as their first element.
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**/
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ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf,
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size_t n, loff_t *f_ps)
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{
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struct iio_dev *indio_dev = filp->private_data;
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struct iio_buffer *rb = indio_dev->buffer;
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int ret;
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if (!indio_dev->info)
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return -ENODEV;
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if (!rb || !rb->access->read_first_n)
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return -EINVAL;
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do {
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if (!iio_buffer_data_available(rb)) {
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if (filp->f_flags & O_NONBLOCK)
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return -EAGAIN;
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ret = wait_event_interruptible(rb->pollq,
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iio_buffer_data_available(rb) ||
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indio_dev->info == NULL);
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if (ret)
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return ret;
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if (indio_dev->info == NULL)
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return -ENODEV;
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}
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ret = rb->access->read_first_n(rb, n, buf);
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if (ret == 0 && (filp->f_flags & O_NONBLOCK))
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ret = -EAGAIN;
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} while (ret == 0);
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return ret;
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}
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/**
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* iio_buffer_poll() - poll the buffer to find out if it has data
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*/
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unsigned int iio_buffer_poll(struct file *filp,
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struct poll_table_struct *wait)
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{
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struct iio_dev *indio_dev = filp->private_data;
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struct iio_buffer *rb = indio_dev->buffer;
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if (!indio_dev->info)
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return -ENODEV;
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poll_wait(filp, &rb->pollq, wait);
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if (iio_buffer_data_available(rb))
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return POLLIN | POLLRDNORM;
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/* need a way of knowing if there may be enough data... */
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return 0;
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}
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/**
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* iio_buffer_wakeup_poll - Wakes up the buffer waitqueue
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* @indio_dev: The IIO device
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*
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* Wakes up the event waitqueue used for poll(). Should usually
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* be called when the device is unregistered.
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*/
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void iio_buffer_wakeup_poll(struct iio_dev *indio_dev)
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{
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if (!indio_dev->buffer)
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return;
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wake_up(&indio_dev->buffer->pollq);
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}
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void iio_buffer_init(struct iio_buffer *buffer)
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{
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INIT_LIST_HEAD(&buffer->demux_list);
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INIT_LIST_HEAD(&buffer->buffer_list);
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init_waitqueue_head(&buffer->pollq);
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kref_init(&buffer->ref);
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}
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EXPORT_SYMBOL(iio_buffer_init);
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static ssize_t iio_show_scan_index(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index);
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}
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static ssize_t iio_show_fixed_type(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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u8 type = this_attr->c->scan_type.endianness;
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if (type == IIO_CPU) {
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#ifdef __LITTLE_ENDIAN
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type = IIO_LE;
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#else
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type = IIO_BE;
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#endif
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}
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if (this_attr->c->scan_type.repeat > 1)
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return sprintf(buf, "%s:%c%d/%dX%d>>%u\n",
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iio_endian_prefix[type],
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this_attr->c->scan_type.sign,
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this_attr->c->scan_type.realbits,
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this_attr->c->scan_type.storagebits,
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this_attr->c->scan_type.repeat,
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this_attr->c->scan_type.shift);
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else
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return sprintf(buf, "%s:%c%d/%d>>%u\n",
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iio_endian_prefix[type],
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this_attr->c->scan_type.sign,
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this_attr->c->scan_type.realbits,
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this_attr->c->scan_type.storagebits,
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this_attr->c->scan_type.shift);
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}
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static ssize_t iio_scan_el_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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int ret;
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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/* Ensure ret is 0 or 1. */
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ret = !!test_bit(to_iio_dev_attr(attr)->address,
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indio_dev->buffer->scan_mask);
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return sprintf(buf, "%d\n", ret);
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}
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static int iio_scan_mask_clear(struct iio_buffer *buffer, int bit)
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{
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clear_bit(bit, buffer->scan_mask);
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return 0;
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}
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static ssize_t iio_scan_el_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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int ret;
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bool state;
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct iio_buffer *buffer = indio_dev->buffer;
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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ret = strtobool(buf, &state);
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if (ret < 0)
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return ret;
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mutex_lock(&indio_dev->mlock);
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if (iio_buffer_is_active(indio_dev->buffer)) {
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ret = -EBUSY;
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goto error_ret;
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}
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ret = iio_scan_mask_query(indio_dev, buffer, this_attr->address);
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if (ret < 0)
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goto error_ret;
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if (!state && ret) {
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ret = iio_scan_mask_clear(buffer, this_attr->address);
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if (ret)
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goto error_ret;
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} else if (state && !ret) {
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ret = iio_scan_mask_set(indio_dev, buffer, this_attr->address);
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if (ret)
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goto error_ret;
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}
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error_ret:
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mutex_unlock(&indio_dev->mlock);
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return ret < 0 ? ret : len;
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}
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static ssize_t iio_scan_el_ts_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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return sprintf(buf, "%d\n", indio_dev->buffer->scan_timestamp);
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}
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static ssize_t iio_scan_el_ts_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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int ret;
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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bool state;
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ret = strtobool(buf, &state);
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if (ret < 0)
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return ret;
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mutex_lock(&indio_dev->mlock);
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if (iio_buffer_is_active(indio_dev->buffer)) {
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ret = -EBUSY;
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|
goto error_ret;
|
|
}
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indio_dev->buffer->scan_timestamp = state;
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error_ret:
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mutex_unlock(&indio_dev->mlock);
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|
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return ret ? ret : len;
|
|
}
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|
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|
static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan)
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{
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int ret, attrcount = 0;
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struct iio_buffer *buffer = indio_dev->buffer;
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|
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|
ret = __iio_add_chan_devattr("index",
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chan,
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&iio_show_scan_index,
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NULL,
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0,
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IIO_SEPARATE,
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&indio_dev->dev,
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&buffer->scan_el_dev_attr_list);
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if (ret)
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return ret;
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attrcount++;
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|
ret = __iio_add_chan_devattr("type",
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chan,
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&iio_show_fixed_type,
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NULL,
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0,
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0,
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&indio_dev->dev,
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&buffer->scan_el_dev_attr_list);
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if (ret)
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|
return ret;
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attrcount++;
|
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if (chan->type != IIO_TIMESTAMP)
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|
ret = __iio_add_chan_devattr("en",
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chan,
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&iio_scan_el_show,
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&iio_scan_el_store,
|
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chan->scan_index,
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|
0,
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|
&indio_dev->dev,
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|
&buffer->scan_el_dev_attr_list);
|
|
else
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|
ret = __iio_add_chan_devattr("en",
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chan,
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|
&iio_scan_el_ts_show,
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|
&iio_scan_el_ts_store,
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|
chan->scan_index,
|
|
0,
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|
&indio_dev->dev,
|
|
&buffer->scan_el_dev_attr_list);
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|
if (ret)
|
|
return ret;
|
|
attrcount++;
|
|
ret = attrcount;
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|
return ret;
|
|
}
|
|
|
|
static const char * const iio_scan_elements_group_name = "scan_elements";
|
|
|
|
int iio_buffer_register(struct iio_dev *indio_dev,
|
|
const struct iio_chan_spec *channels,
|
|
int num_channels)
|
|
{
|
|
struct iio_dev_attr *p;
|
|
struct attribute **attr;
|
|
struct iio_buffer *buffer = indio_dev->buffer;
|
|
int ret, i, attrn, attrcount, attrcount_orig = 0;
|
|
|
|
if (buffer->attrs)
|
|
indio_dev->groups[indio_dev->groupcounter++] = buffer->attrs;
|
|
|
|
if (buffer->scan_el_attrs != NULL) {
|
|
attr = buffer->scan_el_attrs->attrs;
|
|
while (*attr++ != NULL)
|
|
attrcount_orig++;
|
|
}
|
|
attrcount = attrcount_orig;
|
|
INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list);
|
|
if (channels) {
|
|
/* new magic */
|
|
for (i = 0; i < num_channels; i++) {
|
|
if (channels[i].scan_index < 0)
|
|
continue;
|
|
|
|
/* Establish necessary mask length */
|
|
if (channels[i].scan_index >
|
|
(int)indio_dev->masklength - 1)
|
|
indio_dev->masklength
|
|
= channels[i].scan_index + 1;
|
|
|
|
ret = iio_buffer_add_channel_sysfs(indio_dev,
|
|
&channels[i]);
|
|
if (ret < 0)
|
|
goto error_cleanup_dynamic;
|
|
attrcount += ret;
|
|
if (channels[i].type == IIO_TIMESTAMP)
|
|
indio_dev->scan_index_timestamp =
|
|
channels[i].scan_index;
|
|
}
|
|
if (indio_dev->masklength && buffer->scan_mask == NULL) {
|
|
buffer->scan_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength),
|
|
sizeof(*buffer->scan_mask),
|
|
GFP_KERNEL);
|
|
if (buffer->scan_mask == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_cleanup_dynamic;
|
|
}
|
|
}
|
|
}
|
|
|
|
buffer->scan_el_group.name = iio_scan_elements_group_name;
|
|
|
|
buffer->scan_el_group.attrs = kcalloc(attrcount + 1,
|
|
sizeof(buffer->scan_el_group.attrs[0]),
|
|
GFP_KERNEL);
|
|
if (buffer->scan_el_group.attrs == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_free_scan_mask;
|
|
}
|
|
if (buffer->scan_el_attrs)
|
|
memcpy(buffer->scan_el_group.attrs, buffer->scan_el_attrs,
|
|
sizeof(buffer->scan_el_group.attrs[0])*attrcount_orig);
|
|
attrn = attrcount_orig;
|
|
|
|
list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l)
|
|
buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr;
|
|
indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group;
|
|
|
|
return 0;
|
|
|
|
error_free_scan_mask:
|
|
kfree(buffer->scan_mask);
|
|
error_cleanup_dynamic:
|
|
iio_free_chan_devattr_list(&buffer->scan_el_dev_attr_list);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(iio_buffer_register);
|
|
|
|
void iio_buffer_unregister(struct iio_dev *indio_dev)
|
|
{
|
|
kfree(indio_dev->buffer->scan_mask);
|
|
kfree(indio_dev->buffer->scan_el_group.attrs);
|
|
iio_free_chan_devattr_list(&indio_dev->buffer->scan_el_dev_attr_list);
|
|
}
|
|
EXPORT_SYMBOL(iio_buffer_unregister);
|
|
|
|
ssize_t iio_buffer_read_length(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct iio_buffer *buffer = indio_dev->buffer;
|
|
|
|
if (buffer->access->get_length)
|
|
return sprintf(buf, "%d\n",
|
|
buffer->access->get_length(buffer));
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(iio_buffer_read_length);
|
|
|
|
ssize_t iio_buffer_write_length(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct iio_buffer *buffer = indio_dev->buffer;
|
|
unsigned int val;
|
|
int ret;
|
|
|
|
ret = kstrtouint(buf, 10, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (buffer->access->get_length)
|
|
if (val == buffer->access->get_length(buffer))
|
|
return len;
|
|
|
|
mutex_lock(&indio_dev->mlock);
|
|
if (iio_buffer_is_active(indio_dev->buffer)) {
|
|
ret = -EBUSY;
|
|
} else {
|
|
if (buffer->access->set_length)
|
|
buffer->access->set_length(buffer, val);
|
|
ret = 0;
|
|
}
|
|
mutex_unlock(&indio_dev->mlock);
|
|
|
|
return ret ? ret : len;
|
|
}
|
|
EXPORT_SYMBOL(iio_buffer_write_length);
|
|
|
|
ssize_t iio_buffer_show_enable(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
return sprintf(buf, "%d\n", iio_buffer_is_active(indio_dev->buffer));
|
|
}
|
|
EXPORT_SYMBOL(iio_buffer_show_enable);
|
|
|
|
/* Note NULL used as error indicator as it doesn't make sense. */
|
|
static const unsigned long *iio_scan_mask_match(const unsigned long *av_masks,
|
|
unsigned int masklength,
|
|
const unsigned long *mask)
|
|
{
|
|
if (bitmap_empty(mask, masklength))
|
|
return NULL;
|
|
while (*av_masks) {
|
|
if (bitmap_subset(mask, av_masks, masklength))
|
|
return av_masks;
|
|
av_masks += BITS_TO_LONGS(masklength);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int iio_compute_scan_bytes(struct iio_dev *indio_dev,
|
|
const unsigned long *mask, bool timestamp)
|
|
{
|
|
const struct iio_chan_spec *ch;
|
|
unsigned bytes = 0;
|
|
int length, i;
|
|
|
|
/* How much space will the demuxed element take? */
|
|
for_each_set_bit(i, mask,
|
|
indio_dev->masklength) {
|
|
ch = iio_find_channel_from_si(indio_dev, i);
|
|
if (ch->scan_type.repeat > 1)
|
|
length = ch->scan_type.storagebits / 8 *
|
|
ch->scan_type.repeat;
|
|
else
|
|
length = ch->scan_type.storagebits / 8;
|
|
bytes = ALIGN(bytes, length);
|
|
bytes += length;
|
|
}
|
|
if (timestamp) {
|
|
ch = iio_find_channel_from_si(indio_dev,
|
|
indio_dev->scan_index_timestamp);
|
|
if (ch->scan_type.repeat > 1)
|
|
length = ch->scan_type.storagebits / 8 *
|
|
ch->scan_type.repeat;
|
|
else
|
|
length = ch->scan_type.storagebits / 8;
|
|
bytes = ALIGN(bytes, length);
|
|
bytes += length;
|
|
}
|
|
return bytes;
|
|
}
|
|
|
|
static void iio_buffer_activate(struct iio_dev *indio_dev,
|
|
struct iio_buffer *buffer)
|
|
{
|
|
iio_buffer_get(buffer);
|
|
list_add(&buffer->buffer_list, &indio_dev->buffer_list);
|
|
}
|
|
|
|
static void iio_buffer_deactivate(struct iio_buffer *buffer)
|
|
{
|
|
list_del_init(&buffer->buffer_list);
|
|
iio_buffer_put(buffer);
|
|
}
|
|
|
|
void iio_disable_all_buffers(struct iio_dev *indio_dev)
|
|
{
|
|
struct iio_buffer *buffer, *_buffer;
|
|
|
|
if (list_empty(&indio_dev->buffer_list))
|
|
return;
|
|
|
|
if (indio_dev->setup_ops->predisable)
|
|
indio_dev->setup_ops->predisable(indio_dev);
|
|
|
|
list_for_each_entry_safe(buffer, _buffer,
|
|
&indio_dev->buffer_list, buffer_list)
|
|
iio_buffer_deactivate(buffer);
|
|
|
|
indio_dev->currentmode = INDIO_DIRECT_MODE;
|
|
if (indio_dev->setup_ops->postdisable)
|
|
indio_dev->setup_ops->postdisable(indio_dev);
|
|
|
|
if (indio_dev->available_scan_masks == NULL)
|
|
kfree(indio_dev->active_scan_mask);
|
|
}
|
|
|
|
static void iio_buffer_update_bytes_per_datum(struct iio_dev *indio_dev,
|
|
struct iio_buffer *buffer)
|
|
{
|
|
unsigned int bytes;
|
|
|
|
if (!buffer->access->set_bytes_per_datum)
|
|
return;
|
|
|
|
bytes = iio_compute_scan_bytes(indio_dev, buffer->scan_mask,
|
|
buffer->scan_timestamp);
|
|
|
|
buffer->access->set_bytes_per_datum(buffer, bytes);
|
|
}
|
|
|
|
static int __iio_update_buffers(struct iio_dev *indio_dev,
|
|
struct iio_buffer *insert_buffer,
|
|
struct iio_buffer *remove_buffer)
|
|
{
|
|
int ret;
|
|
int success = 0;
|
|
struct iio_buffer *buffer;
|
|
unsigned long *compound_mask;
|
|
const unsigned long *old_mask;
|
|
|
|
/* Wind down existing buffers - iff there are any */
|
|
if (!list_empty(&indio_dev->buffer_list)) {
|
|
if (indio_dev->setup_ops->predisable) {
|
|
ret = indio_dev->setup_ops->predisable(indio_dev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
indio_dev->currentmode = INDIO_DIRECT_MODE;
|
|
if (indio_dev->setup_ops->postdisable) {
|
|
ret = indio_dev->setup_ops->postdisable(indio_dev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
/* Keep a copy of current setup to allow roll back */
|
|
old_mask = indio_dev->active_scan_mask;
|
|
if (!indio_dev->available_scan_masks)
|
|
indio_dev->active_scan_mask = NULL;
|
|
|
|
if (remove_buffer)
|
|
iio_buffer_deactivate(remove_buffer);
|
|
if (insert_buffer)
|
|
iio_buffer_activate(indio_dev, insert_buffer);
|
|
|
|
/* If no buffers in list, we are done */
|
|
if (list_empty(&indio_dev->buffer_list)) {
|
|
indio_dev->currentmode = INDIO_DIRECT_MODE;
|
|
if (indio_dev->available_scan_masks == NULL)
|
|
kfree(old_mask);
|
|
return 0;
|
|
}
|
|
|
|
/* What scan mask do we actually have? */
|
|
compound_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength),
|
|
sizeof(long), GFP_KERNEL);
|
|
if (compound_mask == NULL) {
|
|
if (indio_dev->available_scan_masks == NULL)
|
|
kfree(old_mask);
|
|
return -ENOMEM;
|
|
}
|
|
indio_dev->scan_timestamp = 0;
|
|
|
|
list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) {
|
|
bitmap_or(compound_mask, compound_mask, buffer->scan_mask,
|
|
indio_dev->masklength);
|
|
indio_dev->scan_timestamp |= buffer->scan_timestamp;
|
|
}
|
|
if (indio_dev->available_scan_masks) {
|
|
indio_dev->active_scan_mask =
|
|
iio_scan_mask_match(indio_dev->available_scan_masks,
|
|
indio_dev->masklength,
|
|
compound_mask);
|
|
if (indio_dev->active_scan_mask == NULL) {
|
|
/*
|
|
* Roll back.
|
|
* Note can only occur when adding a buffer.
|
|
*/
|
|
iio_buffer_deactivate(insert_buffer);
|
|
if (old_mask) {
|
|
indio_dev->active_scan_mask = old_mask;
|
|
success = -EINVAL;
|
|
}
|
|
else {
|
|
kfree(compound_mask);
|
|
ret = -EINVAL;
|
|
return ret;
|
|
}
|
|
}
|
|
} else {
|
|
indio_dev->active_scan_mask = compound_mask;
|
|
}
|
|
|
|
iio_update_demux(indio_dev);
|
|
|
|
/* Wind up again */
|
|
if (indio_dev->setup_ops->preenable) {
|
|
ret = indio_dev->setup_ops->preenable(indio_dev);
|
|
if (ret) {
|
|
printk(KERN_ERR
|
|
"Buffer not started: buffer preenable failed (%d)\n", ret);
|
|
goto error_remove_inserted;
|
|
}
|
|
}
|
|
indio_dev->scan_bytes =
|
|
iio_compute_scan_bytes(indio_dev,
|
|
indio_dev->active_scan_mask,
|
|
indio_dev->scan_timestamp);
|
|
list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) {
|
|
iio_buffer_update_bytes_per_datum(indio_dev, buffer);
|
|
if (buffer->access->request_update) {
|
|
ret = buffer->access->request_update(buffer);
|
|
if (ret) {
|
|
printk(KERN_INFO
|
|
"Buffer not started: buffer parameter update failed (%d)\n", ret);
|
|
goto error_run_postdisable;
|
|
}
|
|
}
|
|
}
|
|
if (indio_dev->info->update_scan_mode) {
|
|
ret = indio_dev->info
|
|
->update_scan_mode(indio_dev,
|
|
indio_dev->active_scan_mask);
|
|
if (ret < 0) {
|
|
printk(KERN_INFO "Buffer not started: update scan mode failed (%d)\n", ret);
|
|
goto error_run_postdisable;
|
|
}
|
|
}
|
|
/* Definitely possible for devices to support both of these. */
|
|
if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) {
|
|
if (!indio_dev->trig) {
|
|
printk(KERN_INFO "Buffer not started: no trigger\n");
|
|
ret = -EINVAL;
|
|
/* Can only occur on first buffer */
|
|
goto error_run_postdisable;
|
|
}
|
|
indio_dev->currentmode = INDIO_BUFFER_TRIGGERED;
|
|
} else if (indio_dev->modes & INDIO_BUFFER_HARDWARE) {
|
|
indio_dev->currentmode = INDIO_BUFFER_HARDWARE;
|
|
} else { /* Should never be reached */
|
|
ret = -EINVAL;
|
|
goto error_run_postdisable;
|
|
}
|
|
|
|
if (indio_dev->setup_ops->postenable) {
|
|
ret = indio_dev->setup_ops->postenable(indio_dev);
|
|
if (ret) {
|
|
printk(KERN_INFO
|
|
"Buffer not started: postenable failed (%d)\n", ret);
|
|
indio_dev->currentmode = INDIO_DIRECT_MODE;
|
|
if (indio_dev->setup_ops->postdisable)
|
|
indio_dev->setup_ops->postdisable(indio_dev);
|
|
goto error_disable_all_buffers;
|
|
}
|
|
}
|
|
|
|
if (indio_dev->available_scan_masks)
|
|
kfree(compound_mask);
|
|
else
|
|
kfree(old_mask);
|
|
|
|
return success;
|
|
|
|
error_disable_all_buffers:
|
|
indio_dev->currentmode = INDIO_DIRECT_MODE;
|
|
error_run_postdisable:
|
|
if (indio_dev->setup_ops->postdisable)
|
|
indio_dev->setup_ops->postdisable(indio_dev);
|
|
error_remove_inserted:
|
|
if (insert_buffer)
|
|
iio_buffer_deactivate(insert_buffer);
|
|
indio_dev->active_scan_mask = old_mask;
|
|
kfree(compound_mask);
|
|
return ret;
|
|
}
|
|
|
|
int iio_update_buffers(struct iio_dev *indio_dev,
|
|
struct iio_buffer *insert_buffer,
|
|
struct iio_buffer *remove_buffer)
|
|
{
|
|
int ret;
|
|
|
|
if (insert_buffer == remove_buffer)
|
|
return 0;
|
|
|
|
mutex_lock(&indio_dev->info_exist_lock);
|
|
mutex_lock(&indio_dev->mlock);
|
|
|
|
if (insert_buffer && iio_buffer_is_active(insert_buffer))
|
|
insert_buffer = NULL;
|
|
|
|
if (remove_buffer && !iio_buffer_is_active(remove_buffer))
|
|
remove_buffer = NULL;
|
|
|
|
if (!insert_buffer && !remove_buffer) {
|
|
ret = 0;
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (indio_dev->info == NULL) {
|
|
ret = -ENODEV;
|
|
goto out_unlock;
|
|
}
|
|
|
|
ret = __iio_update_buffers(indio_dev, insert_buffer, remove_buffer);
|
|
|
|
out_unlock:
|
|
mutex_unlock(&indio_dev->mlock);
|
|
mutex_unlock(&indio_dev->info_exist_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_update_buffers);
|
|
|
|
ssize_t iio_buffer_store_enable(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
int ret;
|
|
bool requested_state;
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
bool inlist;
|
|
|
|
ret = strtobool(buf, &requested_state);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
mutex_lock(&indio_dev->mlock);
|
|
|
|
/* Find out if it is in the list */
|
|
inlist = iio_buffer_is_active(indio_dev->buffer);
|
|
/* Already in desired state */
|
|
if (inlist == requested_state)
|
|
goto done;
|
|
|
|
if (requested_state)
|
|
ret = __iio_update_buffers(indio_dev,
|
|
indio_dev->buffer, NULL);
|
|
else
|
|
ret = __iio_update_buffers(indio_dev,
|
|
NULL, indio_dev->buffer);
|
|
|
|
if (ret < 0)
|
|
goto done;
|
|
done:
|
|
mutex_unlock(&indio_dev->mlock);
|
|
return (ret < 0) ? ret : len;
|
|
}
|
|
EXPORT_SYMBOL(iio_buffer_store_enable);
|
|
|
|
/**
|
|
* iio_validate_scan_mask_onehot() - Validates that exactly one channel is selected
|
|
* @indio_dev: the iio device
|
|
* @mask: scan mask to be checked
|
|
*
|
|
* Return true if exactly one bit is set in the scan mask, false otherwise. It
|
|
* can be used for devices where only one channel can be active for sampling at
|
|
* a time.
|
|
*/
|
|
bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev,
|
|
const unsigned long *mask)
|
|
{
|
|
return bitmap_weight(mask, indio_dev->masklength) == 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_validate_scan_mask_onehot);
|
|
|
|
static bool iio_validate_scan_mask(struct iio_dev *indio_dev,
|
|
const unsigned long *mask)
|
|
{
|
|
if (!indio_dev->setup_ops->validate_scan_mask)
|
|
return true;
|
|
|
|
return indio_dev->setup_ops->validate_scan_mask(indio_dev, mask);
|
|
}
|
|
|
|
/**
|
|
* iio_scan_mask_set() - set particular bit in the scan mask
|
|
* @indio_dev: the iio device
|
|
* @buffer: the buffer whose scan mask we are interested in
|
|
* @bit: the bit to be set.
|
|
*
|
|
* Note that at this point we have no way of knowing what other
|
|
* buffers might request, hence this code only verifies that the
|
|
* individual buffers request is plausible.
|
|
*/
|
|
int iio_scan_mask_set(struct iio_dev *indio_dev,
|
|
struct iio_buffer *buffer, int bit)
|
|
{
|
|
const unsigned long *mask;
|
|
unsigned long *trialmask;
|
|
|
|
trialmask = kmalloc(sizeof(*trialmask)*
|
|
BITS_TO_LONGS(indio_dev->masklength),
|
|
GFP_KERNEL);
|
|
|
|
if (trialmask == NULL)
|
|
return -ENOMEM;
|
|
if (!indio_dev->masklength) {
|
|
WARN_ON("Trying to set scanmask prior to registering buffer\n");
|
|
goto err_invalid_mask;
|
|
}
|
|
bitmap_copy(trialmask, buffer->scan_mask, indio_dev->masklength);
|
|
set_bit(bit, trialmask);
|
|
|
|
if (!iio_validate_scan_mask(indio_dev, trialmask))
|
|
goto err_invalid_mask;
|
|
|
|
if (indio_dev->available_scan_masks) {
|
|
mask = iio_scan_mask_match(indio_dev->available_scan_masks,
|
|
indio_dev->masklength,
|
|
trialmask);
|
|
if (!mask)
|
|
goto err_invalid_mask;
|
|
}
|
|
bitmap_copy(buffer->scan_mask, trialmask, indio_dev->masklength);
|
|
|
|
kfree(trialmask);
|
|
|
|
return 0;
|
|
|
|
err_invalid_mask:
|
|
kfree(trialmask);
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_scan_mask_set);
|
|
|
|
int iio_scan_mask_query(struct iio_dev *indio_dev,
|
|
struct iio_buffer *buffer, int bit)
|
|
{
|
|
if (bit > indio_dev->masklength)
|
|
return -EINVAL;
|
|
|
|
if (!buffer->scan_mask)
|
|
return 0;
|
|
|
|
/* Ensure return value is 0 or 1. */
|
|
return !!test_bit(bit, buffer->scan_mask);
|
|
};
|
|
EXPORT_SYMBOL_GPL(iio_scan_mask_query);
|
|
|
|
/**
|
|
* struct iio_demux_table() - table describing demux memcpy ops
|
|
* @from: index to copy from
|
|
* @to: index to copy to
|
|
* @length: how many bytes to copy
|
|
* @l: list head used for management
|
|
*/
|
|
struct iio_demux_table {
|
|
unsigned from;
|
|
unsigned to;
|
|
unsigned length;
|
|
struct list_head l;
|
|
};
|
|
|
|
static const void *iio_demux(struct iio_buffer *buffer,
|
|
const void *datain)
|
|
{
|
|
struct iio_demux_table *t;
|
|
|
|
if (list_empty(&buffer->demux_list))
|
|
return datain;
|
|
list_for_each_entry(t, &buffer->demux_list, l)
|
|
memcpy(buffer->demux_bounce + t->to,
|
|
datain + t->from, t->length);
|
|
|
|
return buffer->demux_bounce;
|
|
}
|
|
|
|
static int iio_push_to_buffer(struct iio_buffer *buffer, const void *data)
|
|
{
|
|
const void *dataout = iio_demux(buffer, data);
|
|
|
|
return buffer->access->store_to(buffer, dataout);
|
|
}
|
|
|
|
static void iio_buffer_demux_free(struct iio_buffer *buffer)
|
|
{
|
|
struct iio_demux_table *p, *q;
|
|
list_for_each_entry_safe(p, q, &buffer->demux_list, l) {
|
|
list_del(&p->l);
|
|
kfree(p);
|
|
}
|
|
}
|
|
|
|
|
|
int iio_push_to_buffers(struct iio_dev *indio_dev, const void *data)
|
|
{
|
|
int ret;
|
|
struct iio_buffer *buf;
|
|
|
|
list_for_each_entry(buf, &indio_dev->buffer_list, buffer_list) {
|
|
ret = iio_push_to_buffer(buf, data);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_push_to_buffers);
|
|
|
|
static int iio_buffer_add_demux(struct iio_buffer *buffer,
|
|
struct iio_demux_table **p, unsigned int in_loc, unsigned int out_loc,
|
|
unsigned int length)
|
|
{
|
|
|
|
if (*p && (*p)->from + (*p)->length == in_loc &&
|
|
(*p)->to + (*p)->length == out_loc) {
|
|
(*p)->length += length;
|
|
} else {
|
|
*p = kmalloc(sizeof(**p), GFP_KERNEL);
|
|
if (*p == NULL)
|
|
return -ENOMEM;
|
|
(*p)->from = in_loc;
|
|
(*p)->to = out_loc;
|
|
(*p)->length = length;
|
|
list_add_tail(&(*p)->l, &buffer->demux_list);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iio_buffer_update_demux(struct iio_dev *indio_dev,
|
|
struct iio_buffer *buffer)
|
|
{
|
|
const struct iio_chan_spec *ch;
|
|
int ret, in_ind = -1, out_ind, length;
|
|
unsigned in_loc = 0, out_loc = 0;
|
|
struct iio_demux_table *p = NULL;
|
|
|
|
/* Clear out any old demux */
|
|
iio_buffer_demux_free(buffer);
|
|
kfree(buffer->demux_bounce);
|
|
buffer->demux_bounce = NULL;
|
|
|
|
/* First work out which scan mode we will actually have */
|
|
if (bitmap_equal(indio_dev->active_scan_mask,
|
|
buffer->scan_mask,
|
|
indio_dev->masklength))
|
|
return 0;
|
|
|
|
/* Now we have the two masks, work from least sig and build up sizes */
|
|
for_each_set_bit(out_ind,
|
|
buffer->scan_mask,
|
|
indio_dev->masklength) {
|
|
in_ind = find_next_bit(indio_dev->active_scan_mask,
|
|
indio_dev->masklength,
|
|
in_ind + 1);
|
|
while (in_ind != out_ind) {
|
|
in_ind = find_next_bit(indio_dev->active_scan_mask,
|
|
indio_dev->masklength,
|
|
in_ind + 1);
|
|
ch = iio_find_channel_from_si(indio_dev, in_ind);
|
|
if (ch->scan_type.repeat > 1)
|
|
length = ch->scan_type.storagebits / 8 *
|
|
ch->scan_type.repeat;
|
|
else
|
|
length = ch->scan_type.storagebits / 8;
|
|
/* Make sure we are aligned */
|
|
in_loc = roundup(in_loc, length) + length;
|
|
}
|
|
ch = iio_find_channel_from_si(indio_dev, in_ind);
|
|
if (ch->scan_type.repeat > 1)
|
|
length = ch->scan_type.storagebits / 8 *
|
|
ch->scan_type.repeat;
|
|
else
|
|
length = ch->scan_type.storagebits / 8;
|
|
out_loc = roundup(out_loc, length);
|
|
in_loc = roundup(in_loc, length);
|
|
ret = iio_buffer_add_demux(buffer, &p, in_loc, out_loc, length);
|
|
if (ret)
|
|
goto error_clear_mux_table;
|
|
out_loc += length;
|
|
in_loc += length;
|
|
}
|
|
/* Relies on scan_timestamp being last */
|
|
if (buffer->scan_timestamp) {
|
|
ch = iio_find_channel_from_si(indio_dev,
|
|
indio_dev->scan_index_timestamp);
|
|
if (ch->scan_type.repeat > 1)
|
|
length = ch->scan_type.storagebits / 8 *
|
|
ch->scan_type.repeat;
|
|
else
|
|
length = ch->scan_type.storagebits / 8;
|
|
out_loc = roundup(out_loc, length);
|
|
in_loc = roundup(in_loc, length);
|
|
ret = iio_buffer_add_demux(buffer, &p, in_loc, out_loc, length);
|
|
if (ret)
|
|
goto error_clear_mux_table;
|
|
out_loc += length;
|
|
in_loc += length;
|
|
}
|
|
buffer->demux_bounce = kzalloc(out_loc, GFP_KERNEL);
|
|
if (buffer->demux_bounce == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_clear_mux_table;
|
|
}
|
|
return 0;
|
|
|
|
error_clear_mux_table:
|
|
iio_buffer_demux_free(buffer);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int iio_update_demux(struct iio_dev *indio_dev)
|
|
{
|
|
struct iio_buffer *buffer;
|
|
int ret;
|
|
|
|
list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) {
|
|
ret = iio_buffer_update_demux(indio_dev, buffer);
|
|
if (ret < 0)
|
|
goto error_clear_mux_table;
|
|
}
|
|
return 0;
|
|
|
|
error_clear_mux_table:
|
|
list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list)
|
|
iio_buffer_demux_free(buffer);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_update_demux);
|
|
|
|
/**
|
|
* iio_buffer_release() - Free a buffer's resources
|
|
* @ref: Pointer to the kref embedded in the iio_buffer struct
|
|
*
|
|
* This function is called when the last reference to the buffer has been
|
|
* dropped. It will typically free all resources allocated by the buffer. Do not
|
|
* call this function manually, always use iio_buffer_put() when done using a
|
|
* buffer.
|
|
*/
|
|
static void iio_buffer_release(struct kref *ref)
|
|
{
|
|
struct iio_buffer *buffer = container_of(ref, struct iio_buffer, ref);
|
|
|
|
buffer->access->release(buffer);
|
|
}
|
|
|
|
/**
|
|
* iio_buffer_get() - Grab a reference to the buffer
|
|
* @buffer: The buffer to grab a reference for, may be NULL
|
|
*
|
|
* Returns the pointer to the buffer that was passed into the function.
|
|
*/
|
|
struct iio_buffer *iio_buffer_get(struct iio_buffer *buffer)
|
|
{
|
|
if (buffer)
|
|
kref_get(&buffer->ref);
|
|
|
|
return buffer;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_buffer_get);
|
|
|
|
/**
|
|
* iio_buffer_put() - Release the reference to the buffer
|
|
* @buffer: The buffer to release the reference for, may be NULL
|
|
*/
|
|
void iio_buffer_put(struct iio_buffer *buffer)
|
|
{
|
|
if (buffer)
|
|
kref_put(&buffer->ref, iio_buffer_release);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_buffer_put);
|