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beaglelogic.c
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beaglelogic.c
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/*
* Kernel module for BeagleLogic - a logic analyzer for the BeagleBone [Black]
* Designed to be used in conjunction with a modified pru_rproc driver
*
* Copyright (C) 2014-17 Kumar Abhishek <abhishek@theembeddedkitchen.net>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <asm/atomic.h>
#include <asm/uaccess.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/poll.h>
#include <linux/platform_device.h>
#include <linux/pruss.h>
#include <linux/remoteproc.h>
#include <linux/miscdevice.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/irqreturn.h>
#include <linux/slab.h>
#include <linux/genalloc.h>
#include <linux/mm.h>
#include <linux/dma-mapping.h>
#include <linux/kobject.h>
#include <linux/string.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/sysfs.h>
#include <linux/fs.h>
#include "beaglelogic.h"
/* Buffer states */
enum bufstates {
STATE_BL_BUF_ALLOC,
STATE_BL_BUF_MAPPED,
STATE_BL_BUF_UNMAPPED,
STATE_BL_BUF_DROPPED
};
/* PRU Commands */
#define CMD_GET_VERSION 1 /* Firmware version */
#define CMD_GET_MAX_SG 2 /* Get the max number of bufferlist entries */
#define CMD_SET_CONFIG 3 /* Get the context pointer */
#define CMD_START 4 /* Arm the LA (start sampling) */
/* PRU-side sample buffer descriptor */
struct buflist {
uint32_t dma_start_addr;
uint32_t dma_end_addr;
};
/* Shared structure containing PRU attributes */
struct capture_context {
/* Magic bytes */
#define BL_FW_MAGIC 0xBEA61E10
uint32_t magic; // Magic bytes, should be 0xBEA61E10
uint32_t cmd; // Command from Linux host to us
uint32_t resp; // Response code
uint32_t samplediv; // Sample rate = (100 / samplediv) MHz
uint32_t sampleunit; // 0 = 16-bit, 1 = 8-bit
uint32_t triggerflags; // 0 = one-shot, 1 = continuous sampling
struct buflist list_head;
};
/* Forward declration */
static const struct file_operations pru_beaglelogic_fops;
/* Buffers are arranged as an array but are
* also circularly linked to simplify reads */
struct logic_buffer {
void *buf;
dma_addr_t phys_addr;
size_t size;
unsigned short state;
unsigned short index;
struct logic_buffer *next;
};
struct beaglelogic_private_data {
const char *fw_names[PRUSS_NUM_PRUS];
};
struct beaglelogicdev {
/* Misc device descriptor */
struct miscdevice miscdev;
/* Handle to pruss structure and PRU0 SRAM */
struct pruss *pruss;
struct rproc *pru0, *pru1;
struct pruss_mem_region pru0sram;
const struct beaglelogic_private_data *fw_data;
/* IRQ numbers */
int to_bl_irq;
int from_bl_irq_1;
int from_bl_irq_2;
/* Core clock frequency: Required for configuring sample rates */
uint32_t coreclockfreq;
/* Private data */
struct device *p_dev; /* Parent platform device */
/* Locks */
struct mutex mutex;
/* Buffer management */
struct logic_buffer *buffers;
struct logic_buffer *lastbufready;
struct logic_buffer *bufbeingread;
uint32_t bufcount;
wait_queue_head_t wait;
/* ISR Bookkeeping */
uint32_t previntcount; /* Previous interrupt count read from PRU */
/* Firmware capabilities */
struct capture_context *cxt_pru;
/* Device capabilities */
uint32_t maxbufcount; /* Max buffer count supported by the PRU FW */
uint32_t bufunitsize; /* Size of 1 Allocation unit */
uint32_t samplerate; /* Sample rate = 100 / n MHz, n = 1+ (int) */
uint32_t triggerflags; /* 0:one-shot, 1:continuous */
uint32_t sampleunit; /* 0:16bits, 1:8bits */
/* State */
uint32_t state;
uint32_t lasterror;
};
struct logic_buffer_reader {
struct beaglelogicdev *bldev;
struct logic_buffer *buf;
uint32_t pos;
uint32_t remaining;
};
#define to_beaglelogicdev(dev) container_of((dev), \
struct beaglelogicdev, miscdev)
#define DRV_NAME "beaglelogic"
#define DRV_VERSION "1.2"
/* Begin Buffer Management section */
/* Allocate DMA buffers for the PRU
* This method acquires & releases the device mutex */
static int beaglelogic_memalloc(struct device *dev, uint32_t bufsize)
{
struct beaglelogicdev *bldev = dev_get_drvdata(dev);
int i, cnt;
void *buf;
/* Check if BL is in use */
if (!mutex_trylock(&bldev->mutex))
return -EBUSY;
/* Compute no. of buffers to allocate, round up
* We need at least two buffers for ping-pong action */
cnt = max(DIV_ROUND_UP(bufsize, bldev->bufunitsize), (uint32_t)2);
/* Too large? */
if (cnt > bldev->maxbufcount) {
dev_err(dev, "Not enough memory\n");
return -ENOMEM;
}
bldev->bufcount = cnt;
/* Allocate buffer list */
bldev->buffers = devm_kzalloc(dev, sizeof(struct logic_buffer) * (cnt),
GFP_KERNEL);
if (!bldev->buffers)
goto failnomem;
/* Allocate DMA buffers */
for (i = 0; i < cnt; i++) {
buf = kmalloc(bldev->bufunitsize, GFP_KERNEL);
if (!buf)
goto failrelease;
/* Fill with 0xFF */
memset(buf, 0xFF, bldev->bufunitsize);
/* Set the buffers */
bldev->buffers[i].buf = buf;
bldev->buffers[i].phys_addr = virt_to_phys(buf);
bldev->buffers[i].size = bldev->bufunitsize;
bldev->buffers[i].index = i;
/* Circularly link the buffers */
bldev->buffers[i].next = &bldev->buffers[(i + 1) % cnt];
}
/* Write log and unlock */
dev_info(dev, "Successfully allocated %d bytes of memory.\n",
cnt * bldev->bufunitsize);
mutex_unlock(&bldev->mutex);
/* Done */
return 0;
failrelease:
for (i = 0; i < cnt; i++) {
if (bldev->buffers[i].buf)
kfree(bldev->buffers[i].buf);
}
devm_kfree(dev, bldev->buffers);
bldev->bufcount = 0;
bldev->buffers = NULL;
dev_err(dev, "Sample buffer allocation:");
failnomem:
dev_err(dev, "Not enough memory\n");
mutex_unlock(&bldev->mutex);
return -ENOMEM;
}
/* Frees the DMA buffers and the bufferlist */
static void beaglelogic_memfree(struct device *dev)
{
struct beaglelogicdev *bldev = dev_get_drvdata(dev);
int i;
mutex_lock(&bldev->mutex);
if (bldev->buffers) {
for (i = 0; i < bldev->bufcount; i++)
if (bldev->buffers[i].buf)
kfree(bldev->buffers[i].buf);
devm_kfree(dev, bldev->buffers);
bldev->buffers = NULL;
bldev->bufcount = 0;
}
mutex_unlock(&bldev->mutex);
}
/* No argument checking for the map/unmap functions */
static int beaglelogic_map_buffer(struct device *dev, struct logic_buffer *buf)
{
dma_addr_t dma_addr;
/* If already mapped, do nothing */
if (buf->state == STATE_BL_BUF_MAPPED)
return 0;
dma_addr = dma_map_single(dev, buf->buf, buf->size, DMA_FROM_DEVICE);
if (dma_mapping_error(dev, dma_addr))
goto fail;
else {
buf->phys_addr = dma_addr;
buf->state = STATE_BL_BUF_MAPPED;
}
return 0;
fail:
dev_err(dev, "DMA Mapping error. \n");
return -1;
}
static void beaglelogic_unmap_buffer(struct device *dev,
struct logic_buffer *buf)
{
dma_unmap_single(dev, buf->phys_addr, buf->size, DMA_FROM_DEVICE);
buf->state = STATE_BL_BUF_UNMAPPED;
}
/* Fill the sample buffer with a pattern of increasing 32-bit ints
* This can be studied to watch out for dropped bytes/buffers */
static void beaglelogic_fill_buffer_testpattern(struct device *dev)
{
struct beaglelogicdev *bldev = dev_get_drvdata(dev);
int i, j;
uint32_t cnt = 0, *addr;
mutex_lock(&bldev->mutex);
for (i = 0; i < bldev->bufcount; i++) {
addr = bldev->buffers[i].buf;
for (j = 0; j < bldev->buffers[i].size / sizeof(cnt); j++)
*addr++ = cnt++;
}
mutex_unlock(&bldev->mutex);
}
/* Map all the buffers. This is done just before beginning a sample operation
* NOTE: PRUs are halted at this time */
static int beaglelogic_map_and_submit_all_buffers(struct device *dev)
{
struct beaglelogicdev *bldev = dev_get_drvdata(dev);
struct buflist *pru_buflist = &bldev->cxt_pru->list_head;
int i, j;
dma_addr_t addr;
if (!pru_buflist)
return -1;
for (i = 0; i < bldev->bufcount;i++) {
if (beaglelogic_map_buffer(dev, &bldev->buffers[i]))
goto fail;
}
/* Write buffer table to the PRU memory, and null terminate */
for (i = 0; i < bldev->bufcount; i++) {
addr = bldev->buffers[i].phys_addr;
pru_buflist[i].dma_start_addr = addr;
pru_buflist[i].dma_end_addr = addr + bldev->buffers[i].size;
}
pru_buflist[i].dma_start_addr = 0;
pru_buflist[i].dma_end_addr = 0;
/* Update state to ready */
if (i)
bldev->state = STATE_BL_ARMED;
return 0;
fail:
/* Unmap the buffers */
for (j = 0; j < i; j++)
beaglelogic_unmap_buffer(dev, &bldev->buffers[i]);
dev_err(dev, "DMA Mapping failed at i=%d\n", i);
bldev->state = STATE_BL_ERROR;
return 1;
}
/* End Buffer Management section */
/* Begin Device Attributes Configuration Section
* All set operations lock and unlock the device mutex */
uint32_t beaglelogic_get_samplerate(struct device *dev)
{
struct beaglelogicdev *bldev = dev_get_drvdata(dev);
return bldev->samplerate;
}
int beaglelogic_set_samplerate(struct device *dev, uint32_t samplerate)
{
struct beaglelogicdev *bldev = dev_get_drvdata(dev);
if (samplerate > bldev->coreclockfreq / 2 || samplerate < 1)
return -EINVAL;
if (mutex_trylock(&bldev->mutex)) {
/* Get sample rate nearest to divisor */
bldev->samplerate = (bldev->coreclockfreq / 2) /
((bldev->coreclockfreq / 2)/ samplerate);
mutex_unlock(&bldev->mutex);
return 0;
}
return -EBUSY;
}
uint32_t beaglelogic_get_sampleunit(struct device *dev)
{
struct beaglelogicdev *bldev = dev_get_drvdata(dev);
return bldev->sampleunit;
}
int beaglelogic_set_sampleunit(struct device *dev, uint32_t sampleunit)
{
struct beaglelogicdev *bldev = dev_get_drvdata(dev);
if (sampleunit > 2)
return -EINVAL;
if (mutex_trylock(&bldev->mutex)) {
bldev->sampleunit = sampleunit;
mutex_unlock(&bldev->mutex);
return 0;
}
return -EBUSY;
}
uint32_t beaglelogic_get_triggerflags(struct device *dev)
{
struct beaglelogicdev *bldev = dev_get_drvdata(dev);
return bldev->triggerflags;
}
int beaglelogic_set_triggerflags(struct device *dev, uint32_t triggerflags)
{
struct beaglelogicdev *bldev = dev_get_drvdata(dev);
if (triggerflags > 1)
return -EINVAL;
if (mutex_trylock(&bldev->mutex)) {
bldev->triggerflags = triggerflags;
mutex_unlock(&bldev->mutex);
return 0;
}
return -EBUSY;
}
/* End Device Attributes Configuration Section */
/* Send command to the PRU firmware */
static int beaglelogic_send_cmd(struct beaglelogicdev *bldev, uint32_t cmd)
{
#define TIMEOUT 200
uint32_t timeout = TIMEOUT;
bldev->cxt_pru->cmd = cmd;
/* Wait for firmware to process the command */
while (--timeout && bldev->cxt_pru->cmd != 0)
cpu_relax();
if (timeout == 0)
return -1;
return bldev->cxt_pru->resp;
}
/* Request the PRU firmware to stop capturing */
static void beaglelogic_request_stop(struct beaglelogicdev *bldev)
{
/* Trigger interrupt */
pruss_intc_trigger(bldev->to_bl_irq);
}
/* This is [to be] called from a threaded IRQ handler */
irqreturn_t beaglelogic_serve_irq(int irqno, void *data)
{
struct beaglelogicdev *bldev = data;
struct device *dev = bldev->miscdev.this_device;
uint32_t state = bldev->state;
dev_dbg(dev, "Beaglelogic IRQ #%d\n", irqno);
if (irqno == bldev->from_bl_irq_1) {
/* Manage the buffers */
bldev->lastbufready = bldev->bufbeingread;
beaglelogic_unmap_buffer(dev, bldev->lastbufready);
/* Avoid a false buffer overrun warning on the last run */
if (bldev->triggerflags != BL_TRIGGERFLAGS_ONESHOT ||
bldev->bufbeingread->next->index != 0) {
bldev->bufbeingread = bldev->bufbeingread->next;
beaglelogic_map_buffer(dev, bldev->bufbeingread);
}
wake_up_interruptible(&bldev->wait);
} else if (irqno == bldev->from_bl_irq_2) {
/* This interrupt occurs twice:
* 1. After a successful configuration of PRU capture
* 2. After the last buffer transferred */
state = bldev->state;
if (state <= STATE_BL_ARMED) {
dev_dbg(dev, "config written, BeagleLogic ready\n");
return IRQ_HANDLED;
}
else if (state != STATE_BL_REQUEST_STOP &&
state != STATE_BL_RUNNING) {
dev_err(dev, "Unexpected stop request \n");
bldev->state = STATE_BL_ERROR;
return IRQ_HANDLED;
}
bldev->state = STATE_BL_INITIALIZED;
wake_up_interruptible(&bldev->wait);
}
return IRQ_HANDLED;
}
/* Write configuration into the PRU [via downcall] (assume mutex is held) */
int beaglelogic_write_configuration(struct device *dev)
{
struct beaglelogicdev *bldev = dev_get_drvdata(dev);
int ret;
/* Hand over the settings */
bldev->cxt_pru->samplediv =
(bldev->coreclockfreq / 2) / bldev->samplerate;
bldev->cxt_pru->sampleunit = bldev->sampleunit;
bldev->cxt_pru->triggerflags = bldev->triggerflags;
ret = beaglelogic_send_cmd(bldev, CMD_SET_CONFIG);
dev_dbg(dev, "PRU Config written, err code = %d\n", ret);
return 0;
}
/* Begin the sampling operation [This takes the mutex] */
int beaglelogic_start(struct device *dev)
{
struct beaglelogicdev *bldev = dev_get_drvdata(dev);
/* This mutex will be locked for the entire duration BeagleLogic runs */
mutex_lock(&bldev->mutex);
if (beaglelogic_write_configuration(dev)) {
mutex_unlock(&bldev->mutex);
return -1;
}
bldev->bufbeingread = &bldev->buffers[0];
beaglelogic_send_cmd(bldev, CMD_START);
/* All set now. Start the PRUs and wait for IRQs */
bldev->state = STATE_BL_RUNNING;
bldev->lasterror = 0;
dev_info(dev, "capture started with sample rate=%d Hz, sampleunit=%d, "\
"triggerflags=%d",
bldev->samplerate,
bldev->sampleunit,
bldev->triggerflags);
return 0;
}
/* Request stop. Stop will effect only after the last buffer is written out */
void beaglelogic_stop(struct device *dev)
{
struct beaglelogicdev *bldev = dev_get_drvdata(dev);
if (mutex_is_locked(&bldev->mutex)) {
if (bldev->state == STATE_BL_RUNNING)
{
beaglelogic_request_stop(bldev);
bldev->state = STATE_BL_REQUEST_STOP;
/* Wait for the PRU to signal completion */
wait_event_interruptible(bldev->wait,
bldev->state == STATE_BL_INITIALIZED);
}
/* Release */
mutex_unlock(&bldev->mutex);
dev_info(dev, "capture session ended\n");
}
}
/* fops */
static int beaglelogic_f_open(struct inode *inode, struct file *filp)
{
struct logic_buffer_reader *reader;
struct beaglelogicdev *bldev = to_beaglelogicdev(filp->private_data);
struct device *dev = bldev->miscdev.this_device;
if (bldev->bufcount == 0)
return -ENOMEM;
reader = devm_kzalloc(dev, sizeof(*reader), GFP_KERNEL);
reader->bldev = bldev;
reader->buf = NULL;
reader->pos = 0;
reader->remaining = 0;
filp->private_data = reader;
/* The buffers will be mapped/resubmitted at the time of allocation
* Here, we just map the first buffer */
if (!bldev->buffers)
return -ENOMEM;
beaglelogic_map_buffer(dev, &bldev->buffers[0]);
return 0;
}
/* Read the sample (ring) buffer. */
ssize_t beaglelogic_f_read (struct file *filp, char __user *buf,
size_t sz, loff_t *offset)
{
int count;
struct logic_buffer_reader *reader = filp->private_data;
struct beaglelogicdev *bldev = reader->bldev;
struct device *dev = bldev->miscdev.this_device;
if (bldev->state == STATE_BL_ERROR)
return -EIO;
if (reader->pos > 0)
goto perform_copy;
if (reader->buf == NULL) {
/* First time init */
reader->buf = &reader->bldev->buffers[0];
reader->remaining = reader->buf->size;
if (bldev->state != STATE_BL_RUNNING) {
/* Start the capture */
if (beaglelogic_start(dev))
return -ENOEXEC;
}
} else {
/* EOF Condition, back to buffer 0 and stopped */
if (reader->buf == bldev->buffers &&
bldev->state == STATE_BL_INITIALIZED)
return 0;
}
if (filp->f_flags & O_NONBLOCK) {
if (reader->buf->state != STATE_BL_BUF_UNMAPPED)
return -EAGAIN;
} else {
if (wait_event_interruptible(bldev->wait,
reader->buf->state == STATE_BL_BUF_UNMAPPED))
return -ERESTARTSYS;
}
perform_copy:
count = min(reader->remaining, sz);
if (copy_to_user(buf, reader->buf->buf + reader->pos, count))
return -EFAULT;
/* Detect buffer drop */
if (reader->buf->state == STATE_BL_BUF_MAPPED) {
dev_warn(dev, "buffer may be dropped at index %d \n",
reader->buf->index);
reader->buf->state = STATE_BL_BUF_DROPPED;
bldev->lasterror = 0x10000 | reader->buf->index;
}
reader->pos += count;
reader->remaining -= count;
if (reader->remaining == 0) {
/* Change the buffer */
reader->buf = reader->buf->next;
reader->pos = 0;
reader->remaining = reader->buf->size;
}
return count;
}
/* Map the PRU buffers to user space [cache coherency managed by driver] */
int beaglelogic_f_mmap(struct file *filp, struct vm_area_struct *vma)
{
int i, ret;
struct logic_buffer_reader *reader = filp->private_data;
struct beaglelogicdev *bldev = reader->bldev;
unsigned long addr = vma->vm_start;
if (vma->vm_end - vma->vm_start > bldev->bufunitsize * bldev->bufcount)
return -EINVAL;
for (i = 0; i < bldev->bufcount; i++) {
ret = remap_pfn_range(vma, addr,
(bldev->buffers[i].phys_addr) >> PAGE_SHIFT,
bldev->buffers[i].size,
vma->vm_page_prot);
if (ret)
return -EINVAL;
addr += bldev->buffers[i].size;
}
return 0;
}
/* Configuration through ioctl */
static long beaglelogic_f_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
struct logic_buffer_reader *reader = filp->private_data;
struct beaglelogicdev *bldev = reader->bldev;
struct device *dev = bldev->miscdev.this_device;
uint32_t val;
dev_dbg(dev, "BeagleLogic: IOCTL called cmd = %08X, "\
"arg = %08lX\n", cmd, arg);
switch (cmd) {
case IOCTL_BL_GET_VERSION:
return 0;
case IOCTL_BL_GET_SAMPLE_RATE:
if (copy_to_user((void * __user)arg,
&bldev->samplerate,
sizeof(bldev->samplerate)))
return -EFAULT;
return 0;
case IOCTL_BL_SET_SAMPLE_RATE:
if (beaglelogic_set_samplerate(dev, (uint32_t)arg))
return -EFAULT;
return 0;
case IOCTL_BL_GET_SAMPLE_UNIT:
if (copy_to_user((void * __user)arg,
&bldev->sampleunit,
sizeof(bldev->sampleunit)))
return -EFAULT;
return 0;
case IOCTL_BL_SET_SAMPLE_UNIT:
if (beaglelogic_set_sampleunit(dev, (uint32_t)arg))
return -EFAULT;
return 0;
case IOCTL_BL_GET_TRIGGER_FLAGS:
if (copy_to_user((void * __user)arg,
&bldev->triggerflags,
sizeof(bldev->triggerflags)))
return -EFAULT;
return 0;
case IOCTL_BL_SET_TRIGGER_FLAGS:
if (beaglelogic_set_triggerflags(dev, (uint32_t)arg))
return -EFAULT;
return 0;
case IOCTL_BL_GET_CUR_INDEX:
if (copy_to_user((void * __user)arg,
&bldev->bufbeingread->index,
sizeof(bldev->bufbeingread->index)))
return -EFAULT;
return 0;
case IOCTL_BL_CACHE_INVALIDATE:
for (val = 0; val < bldev->bufcount; val++) {
beaglelogic_unmap_buffer(dev,
&bldev->buffers[val]);
}
return 0;
case IOCTL_BL_GET_BUFFER_SIZE:
val = bldev->bufunitsize * bldev->bufcount;
if (copy_to_user((void * __user)arg,
&val,
sizeof(val)))
return -EFAULT;
return 0;
case IOCTL_BL_SET_BUFFER_SIZE:
beaglelogic_memfree(dev);
val = beaglelogic_memalloc(dev, arg);
if (!val)
return beaglelogic_map_and_submit_all_buffers(dev);
return val;
case IOCTL_BL_GET_BUFUNIT_SIZE:
if (copy_to_user((void * __user)arg,
&bldev->bufunitsize,
sizeof(bldev->bufunitsize)))
return -EFAULT;
return 0;
case IOCTL_BL_SET_BUFUNIT_SIZE:
if ((uint32_t)arg < 32)
return -EINVAL;
bldev->bufunitsize = round_up(arg, 32);
beaglelogic_memfree(dev);
return 0;
case IOCTL_BL_FILL_TEST_PATTERN:
beaglelogic_fill_buffer_testpattern(dev);
return 0;
case IOCTL_BL_START:
/* Reset and reconfigure the reader object and then start */
reader->buf = &bldev->buffers[0];
reader->pos = 0;
reader->remaining = reader->buf->size;
beaglelogic_start(dev);
return 0;
case IOCTL_BL_STOP:
beaglelogic_stop(dev);
return 0;
}
return -ENOTTY;
}
/* llseek to offset zero resets the LA */
static loff_t beaglelogic_f_llseek(struct file *filp, loff_t offset, int whence)
{
struct logic_buffer_reader *reader = filp->private_data;
struct beaglelogicdev *bldev = reader->bldev;
struct device *dev = bldev->miscdev.this_device;
loff_t i = offset;
uint32_t j;
if (whence == SEEK_CUR) {
while (i > 0) {
if (reader->buf->state == STATE_BL_BUF_MAPPED) {
dev_warn(dev, "buffer may be dropped at index %d \n",
reader->buf->index);
reader->buf->state = STATE_BL_BUF_DROPPED;
bldev->lasterror = 0x10000 | reader->buf->index;
}
j = min((uint32_t)i, reader->remaining);
reader->pos += j;
if ((reader->remaining -= j) == 0) {
/* Change the buffer */
reader->buf = reader->buf->next;
reader->pos = 0;
reader->remaining = reader->buf->size;
}
i -= j;
}
return offset;
}
if (whence == SEEK_SET && offset == 0) {
/* The next read triggers the LA */
reader->buf = NULL;
reader->pos = 0;
reader->remaining = 0;
/* Stop and map the first buffer */
beaglelogic_stop(dev);
beaglelogic_map_buffer(dev, &reader->bldev->buffers[0]);
return 0;
}
return -EINVAL;
}
/* Poll the file descriptor */
unsigned int beaglelogic_f_poll(struct file *filp,
struct poll_table_struct *tbl)
{
struct logic_buffer_reader *reader = filp->private_data;
struct beaglelogicdev *bldev = reader->bldev;
struct logic_buffer *buf;
/* Raise an error if polled without starting the LA first */
if (reader->buf == NULL && bldev->state != STATE_BL_RUNNING)
return -ENOEXEC;
buf = reader->buf;
if (buf->state == STATE_BL_BUF_UNMAPPED)
return (POLLIN | POLLRDNORM);
poll_wait(filp, &bldev->wait, tbl);
return 0;
}
/* Device file close handler */
static int beaglelogic_f_release(struct inode *inode, struct file *filp)
{
struct logic_buffer_reader *reader = filp->private_data;
struct beaglelogicdev *bldev = reader->bldev;
struct device *dev = bldev->miscdev.this_device;
/* Stop & Release */
beaglelogic_stop(dev);
devm_kfree(dev, reader);
return 0;
}
/* File operations struct */
static const struct file_operations pru_beaglelogic_fops = {
.owner = THIS_MODULE,
.open = beaglelogic_f_open,
.unlocked_ioctl = beaglelogic_f_ioctl,
.read = beaglelogic_f_read,
.llseek = beaglelogic_f_llseek,
.mmap = beaglelogic_f_mmap,
.poll = beaglelogic_f_poll,
.release = beaglelogic_f_release,
};
/* fops */
/* begin sysfs attrs */
static ssize_t bl_bufunitsize_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct beaglelogicdev *bldev = dev_get_drvdata(dev);
return scnprintf(buf, PAGE_SIZE, "%d\n", bldev->bufunitsize);
}
static ssize_t bl_bufunitsize_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct beaglelogicdev *bldev = dev_get_drvdata(dev);
uint32_t val;
if (kstrtouint(buf, 10, &val))
return -EINVAL;
if (val < 32)
return -EINVAL;
bldev->bufunitsize = round_up(val, 32);
/* Free up previously allocated buffers */
beaglelogic_memfree(dev);
return count;
}
static ssize_t bl_memalloc_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct beaglelogicdev *bldev = dev_get_drvdata(dev);
return scnprintf(buf, PAGE_SIZE, "%d\n",
bldev->bufcount * bldev->bufunitsize);
}
static ssize_t bl_memalloc_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct beaglelogicdev *bldev = dev_get_drvdata(dev);
uint32_t val;
int ret;
if (kstrtouint(buf, 10, &val))
return -EINVAL;
/* Check value of memory to reserve */
if (val > bldev->maxbufcount * bldev->bufunitsize)
return -EINVAL;
/* Free buffers and reallocate */
beaglelogic_memfree(dev);
ret = beaglelogic_memalloc(dev, val);
if (!ret)
beaglelogic_map_and_submit_all_buffers(dev);
else
return ret;
return count;
}
static ssize_t bl_samplerate_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return scnprintf(buf, PAGE_SIZE, "%d\n",
beaglelogic_get_samplerate(dev));
}
static ssize_t bl_samplerate_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
uint32_t val;
if (kstrtouint(buf, 10, &val))
return -EINVAL;
/* Check value of sample rate - 100 kHz to 100MHz */
if (beaglelogic_set_samplerate(dev, val))
return -EINVAL;
return count;
}
static ssize_t bl_sampleunit_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
uint32_t ret = beaglelogic_get_sampleunit(dev);
int cnt = scnprintf(buf, PAGE_SIZE, "%d:", ret);
switch (ret)
{
case BL_SAMPLEUNIT_16_BITS:
cnt += scnprintf(buf, PAGE_SIZE, "16bit\n");
break;
case BL_SAMPLEUNIT_8_BITS:
cnt += scnprintf(buf, PAGE_SIZE, "8bit\n");
break;
}
return cnt;
}
static ssize_t bl_sampleunit_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
int err;
uint32_t val;