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提交 4c055a5a 编写于 作者: S Sean Young 提交者： Mauro Carvalho Chehab
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[media] redrat3: remove memcpys and fix unaligned memory access 

In stead of doing a memcpy from #defined offset, declare structs which
describe the incoming and outgoing data accurately.
Tested on first generation RedRat.
Signed-off-by: NSean Young <sean@mess.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
上级 801b69f2
隐藏空白更改
内联 并排
Showing with 103 addition and 248 deletion
drivers/media/rc/redrat3.c
浏览文件 @ 4c055a5a
......@@ -45,6 +45,7 @@
*
*/
#include <asm/unaligned.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/slab.h>
......@@ -129,25 +130,11 @@ static int debug;
/* USB bulk-in IR data endpoint address */
#define RR3_BULK_IN_EP_ADDR 0x82
/* Raw Modulated signal data value offsets */
#define RR3_PAUSE_OFFSET 0
#define RR3_FREQ_COUNT_OFFSET 4
#define RR3_NUM_PERIOD_OFFSET 6
#define RR3_MAX_LENGTHS_OFFSET 8
#define RR3_NUM_LENGTHS_OFFSET 9
#define RR3_MAX_SIGS_OFFSET 10
#define RR3_NUM_SIGS_OFFSET 12
#define RR3_REPEATS_OFFSET 14
/* Size of the fixed-length portion of the signal */
#define RR3_HEADER_LENGTH 15
#define RR3_DRIVER_MAXLENS 128
#define RR3_MAX_SIG_SIZE 512
#define RR3_MAX_BUF_SIZE \
((2 * RR3_HEADER_LENGTH) + RR3_DRIVER_MAXLENS + RR3_MAX_SIG_SIZE)
#define RR3_TIME_UNIT 50
#define RR3_END_OF_SIGNAL 0x7f
#define RR3_TX_HEADER_OFFSET 4
#define RR3_TX_TRAILER_LEN 2
#define RR3_RX_MIN_TIMEOUT 5
#define RR3_RX_MAX_TIMEOUT 2000
......@@ -159,6 +146,32 @@ static int debug;
#define USB_RR3USB_PRODUCT_ID 0x0001
#define USB_RR3IIUSB_PRODUCT_ID 0x0005
struct redrat3_header {
__be16 length;
__be16 transfer_type;
} __packed;
/* sending and receiving irdata */
struct redrat3_irdata {
struct redrat3_header header;
__be32 pause;
__be16 mod_freq_count;
__be16 num_periods;
__u8 max_lengths;
__u8 no_lengths;
__be16 max_sig_size;
__be16 sig_size;
__u8 no_repeats;
__be16 lens[RR3_DRIVER_MAXLENS]; /* not aligned */
__u8 sigdata[RR3_MAX_SIG_SIZE];
} __packed;
/* firmware errors */
struct redrat3_error {
struct redrat3_header header;
__be16 fw_error;
} __packed;
/* table of devices that work with this driver */
static struct usb_device_id redrat3_dev_table[] = {
/* Original version of the RedRat3 */
......@@ -180,7 +193,7 @@ struct redrat3_dev {
/* the receive endpoint */
struct usb_endpoint_descriptor *ep_in;
/* the buffer to receive data */
unsigned char *bulk_in_buf;
void *bulk_in_buf;
/* urb used to read ir data */
struct urb *read_urb;
......@@ -205,69 +218,15 @@ struct redrat3_dev {
bool transmitting;
/* store for current packet */
char pbuf[RR3_MAX_BUF_SIZE];
u16 pktlen;
u16 pkttype;
struct redrat3_irdata irdata;
u16 bytes_read;
char *datap;
u32 carrier;
char name[128];
char name[64];
char phys[64];
};
/* All incoming data buffers adhere to a very specific data format */
struct redrat3_signal_header {
u16 length; /* Length of data being transferred */
u16 transfer_type; /* Type of data transferred */
u32 pause; /* Pause between main and repeat signals */
u16 mod_freq_count; /* Value of timer on mod. freq. measurement */
u16 no_periods; /* No. of periods over which mod. freq. is measured */
u8 max_lengths; /* Max no. of lengths (i.e. size of array) */
u8 no_lengths; /* Actual no. of elements in lengths array */
u16 max_sig_size; /* Max no. of values in signal data array */
u16 sig_size; /* Acuto no. of values in signal data array */
u8 no_repeats; /* No. of repeats of repeat signal section */
/* Here forward is the lengths and signal data */
};
static void redrat3_dump_signal_header(struct redrat3_signal_header *header)
{
pr_info("%s:\n", __func__);
pr_info(" * length: %u, transfer_type: 0x%02x\n",
header->length, header->transfer_type);
pr_info(" * pause: %u, freq_count: %u, no_periods: %u\n",
header->pause, header->mod_freq_count, header->no_periods);
pr_info(" * lengths: %u (max: %u)\n",
header->no_lengths, header->max_lengths);
pr_info(" * sig_size: %u (max: %u)\n",
header->sig_size, header->max_sig_size);
pr_info(" * repeats: %u\n", header->no_repeats);
}
static void redrat3_dump_signal_data(char *buffer, u16 len)
{
int offset, i;
char *data_vals;
pr_info("%s:", __func__);
offset = RR3_TX_HEADER_OFFSET + RR3_HEADER_LENGTH
+ (RR3_DRIVER_MAXLENS * sizeof(u16));
/* read RR3_DRIVER_MAXLENS from ctrl msg */
data_vals = buffer + offset;
for (i = 0; i < len; i++) {
if (i % 10 == 0)
pr_cont("\n * ");
pr_cont("%02x ", *data_vals++);
}
pr_cont("\n");
}
/*
* redrat3_issue_async
*
......@@ -349,13 +308,14 @@ static void redrat3_dump_fw_error(struct redrat3_dev *rr3, int code)
}
}
static u32 redrat3_val_to_mod_freq(struct redrat3_signal_header *ph)
static u32 redrat3_val_to_mod_freq(struct redrat3_irdata *irdata)
{
u32 mod_freq = 0;
u16 mod_freq_count = be16_to_cpu(irdata->mod_freq_count);
if (ph->mod_freq_count != 0)
mod_freq = (RR3_CLK * ph->no_periods) /
(ph->mod_freq_count * RR3_CLK_PER_COUNT);
if (mod_freq_count != 0)
mod_freq = (RR3_CLK * be16_to_cpu(irdata->num_periods)) /
(mod_freq_count * RR3_CLK_PER_COUNT);
return mod_freq;
}
......@@ -407,16 +367,11 @@ static void redrat3_rx_timeout(unsigned long data)
static void redrat3_process_ir_data(struct redrat3_dev *rr3)
{
DEFINE_IR_RAW_EVENT(rawir);
struct redrat3_signal_header header;
struct device *dev;
int i, trailer = 0;
unsigned sig_size, single_len, offset, val;
unsigned long delay;
u32 mod_freq, single_len;
u16 *len_vals;
u8 *data_vals;
u32 tmp32;
u16 tmp16;
char *sig_data;
u32 mod_freq;
if (!rr3) {
pr_err("%s called with no context!\n", __func__);
......@@ -426,57 +381,20 @@ static void redrat3_process_ir_data(struct redrat3_dev *rr3)
rr3_ftr(rr3->dev, "Entered %s\n", __func__);
dev = rr3->dev;
sig_data = rr3->pbuf;
header.length = rr3->pktlen;
header.transfer_type = rr3->pkttype;
/* Sanity check */
if (!(header.length >= RR3_HEADER_LENGTH))
dev_warn(dev, "read returned less than rr3 header len\n");
/* Make sure we reset the IR kfifo after a bit of inactivity */
delay = usecs_to_jiffies(rr3->hw_timeout);
mod_timer(&rr3->rx_timeout, jiffies + delay);
memcpy(&tmp32, sig_data + RR3_PAUSE_OFFSET, sizeof(tmp32));
header.pause = be32_to_cpu(tmp32);
memcpy(&tmp16, sig_data + RR3_FREQ_COUNT_OFFSET, sizeof(tmp16));
header.mod_freq_count = be16_to_cpu(tmp16);
memcpy(&tmp16, sig_data + RR3_NUM_PERIOD_OFFSET, sizeof(tmp16));
header.no_periods = be16_to_cpu(tmp16);
header.max_lengths = sig_data[RR3_MAX_LENGTHS_OFFSET];
header.no_lengths = sig_data[RR3_NUM_LENGTHS_OFFSET];
memcpy(&tmp16, sig_data + RR3_MAX_SIGS_OFFSET, sizeof(tmp16));
header.max_sig_size = be16_to_cpu(tmp16);
memcpy(&tmp16, sig_data + RR3_NUM_SIGS_OFFSET, sizeof(tmp16));
header.sig_size = be16_to_cpu(tmp16);
header.no_repeats= sig_data[RR3_REPEATS_OFFSET];
if (debug) {
redrat3_dump_signal_header(&header);
redrat3_dump_signal_data(sig_data, header.sig_size);
}
mod_freq = redrat3_val_to_mod_freq(&header);
mod_freq = redrat3_val_to_mod_freq(&rr3->irdata);
rr3_dbg(dev, "Got mod_freq of %u\n", mod_freq);
/* Here we pull out the 'length' values from the signal */
len_vals = (u16 *)(sig_data + RR3_HEADER_LENGTH);
data_vals = sig_data + RR3_HEADER_LENGTH +
(header.max_lengths * sizeof(u16));
/* process each rr3 encoded byte into an int */
for (i = 0; i < header.sig_size; i++) {
u16 val = len_vals[data_vals[i]];
single_len = redrat3_len_to_us((u32)be16_to_cpu(val));
sig_size = be16_to_cpu(rr3->irdata.sig_size);
for (i = 0; i < sig_size; i++) {
offset = rr3->irdata.sigdata[i];
val = get_unaligned_be16(&rr3->irdata.lens[offset]);
single_len = redrat3_len_to_us(val);
/* we should always get pulse/space/pulse/space samples */
if (i % 2)
......@@ -534,7 +452,7 @@ static u8 redrat3_send_cmd(int cmd, struct redrat3_dev *rr3)
__func__, res, *data);
res = -EIO;
} else
res = (u8)data[0];
res = data[0];
kfree(data);
......@@ -704,79 +622,72 @@ static void redrat3_get_firmware_rev(struct redrat3_dev *rr3)
static void redrat3_read_packet_start(struct redrat3_dev *rr3, int len)
{
u16 tx_error;
u16 hdrlen;
struct redrat3_header *header = rr3->bulk_in_buf;
unsigned pktlen, pkttype;
rr3_ftr(rr3->dev, "Entering %s\n", __func__);
/* grab the Length and type of transfer */
memcpy(&(rr3->pktlen), (unsigned char *) rr3->bulk_in_buf,
sizeof(rr3->pktlen));
memcpy(&(rr3->pkttype), ((unsigned char *) rr3->bulk_in_buf +
sizeof(rr3->pktlen)),
sizeof(rr3->pkttype));
pktlen = be16_to_cpu(header->length);
pkttype = be16_to_cpu(header->transfer_type);
/*data needs conversion to know what its real values are*/
rr3->pktlen = be16_to_cpu(rr3->pktlen);
rr3->pkttype = be16_to_cpu(rr3->pkttype);
if (pktlen > sizeof(rr3->irdata)) {
dev_warn(rr3->dev, "packet length %u too large\n", pktlen);
return;
}
switch (rr3->pkttype) {
switch (pkttype) {
case RR3_ERROR:
memcpy(&tx_error, ((unsigned char *)rr3->bulk_in_buf
+ (sizeof(rr3->pktlen) + sizeof(rr3->pkttype))),
sizeof(tx_error));
tx_error = be16_to_cpu(tx_error);
redrat3_dump_fw_error(rr3, tx_error);
if (len >= sizeof(struct redrat3_error)) {
struct redrat3_error *error = rr3->bulk_in_buf;
unsigned fw_error = be16_to_cpu(error->fw_error);
redrat3_dump_fw_error(rr3, fw_error);
}
break;
case RR3_MOD_SIGNAL_IN:
hdrlen = sizeof(rr3->pktlen) + sizeof(rr3->pkttype);
memcpy(&rr3->irdata, rr3->bulk_in_buf, len);
rr3->bytes_read = len;
rr3->bytes_read -= hdrlen;
rr3->datap = &(rr3->pbuf[0]);
memcpy(rr3->datap, ((unsigned char *)rr3->bulk_in_buf + hdrlen),
rr3->bytes_read);
rr3->datap += rr3->bytes_read;
rr3_dbg(rr3->dev, "bytes_read %d, pktlen %d\n",
rr3->bytes_read, rr3->pktlen);
rr3->bytes_read, pktlen);
break;
default:
rr3_dbg(rr3->dev, "ignoring packet with type 0x%02x, "
"len of %d, 0x%02x\n", rr3->pkttype, len, rr3->pktlen);
rr3_dbg(rr3->dev, "ignoring packet with type 0x%02x, len of %d, 0x%02x\n",
pkttype, len, pktlen);
break;
}
}
static void redrat3_read_packet_continue(struct redrat3_dev *rr3, int len)
{
void *irdata = &rr3->irdata;
rr3_ftr(rr3->dev, "Entering %s\n", __func__);
memcpy(rr3->datap, (unsigned char *)rr3->bulk_in_buf, len);
rr3->datap += len;
if (len + rr3->bytes_read > sizeof(rr3->irdata)) {
dev_warn(rr3->dev, "too much data for packet\n");
rr3->bytes_read = 0;
return;
}
memcpy(irdata + rr3->bytes_read, rr3->bulk_in_buf, len);
rr3->bytes_read += len;
rr3_dbg(rr3->dev, "bytes_read %d, pktlen %d\n",
rr3->bytes_read, rr3->pktlen);
rr3_dbg(rr3->dev, "bytes_read %d, pktlen %d\n", rr3->bytes_read,
be16_to_cpu(rr3->irdata.header.length));
}
/* gather IR data from incoming urb, process it when we have enough */
static int redrat3_get_ir_data(struct redrat3_dev *rr3, int len)
{
struct device *dev = rr3->dev;
unsigned pkttype;
int ret = 0;
rr3_ftr(dev, "Entering %s\n", __func__);
if (rr3->pktlen > RR3_MAX_BUF_SIZE) {
dev_err(rr3->dev, "error: packet larger than buffer\n");
ret = -EINVAL;
goto out;
}
if ((rr3->bytes_read == 0) &&
(len >= (sizeof(rr3->pkttype) + sizeof(rr3->pktlen)))) {
if (rr3->bytes_read == 0 && len >= sizeof(struct redrat3_header)) {
redrat3_read_packet_start(rr3, len);
} else if (rr3->bytes_read != 0) {
redrat3_read_packet_continue(rr3, len);
......@@ -786,26 +697,20 @@ static int redrat3_get_ir_data(struct redrat3_dev *rr3, int len)
goto out;
}
if (rr3->bytes_read > rr3->pktlen) {
dev_err(dev, "bytes_read (%d) greater than pktlen (%d)\n",
rr3->bytes_read, rr3->pktlen);
ret = -EINVAL;
goto out;
} else if (rr3->bytes_read < rr3->pktlen)
if (rr3->bytes_read < be16_to_cpu(rr3->irdata.header.length))
/* we're still accumulating data */
return 0;
/* if we get here, we've got IR data to decode */
if (rr3->pkttype == RR3_MOD_SIGNAL_IN)
pkttype = be16_to_cpu(rr3->irdata.header.transfer_type);
if (pkttype == RR3_MOD_SIGNAL_IN)
redrat3_process_ir_data(rr3);
else
rr3_dbg(dev, "discarding non-signal data packet "
"(type 0x%02x)\n", rr3->pkttype);
rr3_dbg(dev, "discarding non-signal data packet (type 0x%02x)\n",
pkttype);
out:
rr3->bytes_read = 0;
rr3->pktlen = 0;
rr3->pkttype = 0;
return ret;
}
......@@ -846,8 +751,6 @@ static void redrat3_handle_async(struct urb *urb)
default:
dev_warn(rr3->dev, "Error: urb status = %d\n", urb->status);
rr3->bytes_read = 0;
rr3->pktlen = 0;
rr3->pkttype = 0;
break;
}
}
......@@ -873,7 +776,7 @@ static u16 mod_freq_to_val(unsigned int mod_freq)
int mult = 6000000;
/* Clk used in mod. freq. generation is CLK24/4. */
return (u16)(65536 - (mult / mod_freq));
return 65536 - (mult / mod_freq);
}
static int redrat3_set_tx_carrier(struct rc_dev *rcdev, u32 carrier)
......@@ -895,16 +798,11 @@ static int redrat3_transmit_ir(struct rc_dev *rcdev, unsigned *txbuf,
{
struct redrat3_dev *rr3 = rcdev->priv;
struct device *dev = rr3->dev;
struct redrat3_signal_header header;
int i, ret, ret_len, offset;
struct redrat3_irdata *irdata = NULL;
int i, ret, ret_len;
int lencheck, cur_sample_len, pipe;
char *buffer = NULL, *sigdata = NULL;
int *sample_lens = NULL;
u32 tmpi;
u16 tmps;
u8 *datap;
u8 curlencheck = 0;
u16 *lengths_ptr;
int sendbuf_len;
rr3_ftr(dev, "Entering %s\n", __func__);
......@@ -926,8 +824,8 @@ static int redrat3_transmit_ir(struct rc_dev *rcdev, unsigned *txbuf,
goto out;
}
sigdata = kzalloc((count + RR3_TX_TRAILER_LEN), GFP_KERNEL);
if (!sigdata) {
irdata = kzalloc(sizeof(*irdata), GFP_KERNEL);
if (!irdata) {
ret = -ENOMEM;
goto out;
}
......@@ -950,83 +848,41 @@ static int redrat3_transmit_ir(struct rc_dev *rcdev, unsigned *txbuf,
/* now convert the value to a proper
* rr3 value.. */
sample_lens[curlencheck] = cur_sample_len;
put_unaligned_be16(cur_sample_len,
&irdata->lens[curlencheck]);
curlencheck++;
} else {
count = i - 1;
break;
}
}
sigdata[i] = lencheck;
irdata->sigdata[i] = lencheck;
}
sigdata[count] = RR3_END_OF_SIGNAL;
sigdata[count + 1] = RR3_END_OF_SIGNAL;
offset = RR3_TX_HEADER_OFFSET;
sendbuf_len = RR3_HEADER_LENGTH + (sizeof(u16) * RR3_DRIVER_MAXLENS)
+ count + RR3_TX_TRAILER_LEN + offset;
buffer = kzalloc(sendbuf_len, GFP_KERNEL);
if (!buffer) {
ret = -ENOMEM;
goto out;
}
irdata->sigdata[count] = RR3_END_OF_SIGNAL;
irdata->sigdata[count + 1] = RR3_END_OF_SIGNAL;
sendbuf_len = offsetof(struct redrat3_irdata,
sigdata[count + RR3_TX_TRAILER_LEN]);
/* fill in our packet header */
header.length = sendbuf_len - offset;
header.transfer_type = RR3_MOD_SIGNAL_OUT;
header.pause = redrat3_len_to_us(100);
header.mod_freq_count = mod_freq_to_val(rr3->carrier);
header.no_periods = 0; /* n/a to transmit */
header.max_lengths = RR3_DRIVER_MAXLENS;
header.no_lengths = curlencheck;
header.max_sig_size = RR3_MAX_SIG_SIZE;
header.sig_size = count + RR3_TX_TRAILER_LEN;
/* we currently rely on repeat handling in the IR encoding source */
header.no_repeats = 0;
tmps = cpu_to_be16(header.length);
memcpy(buffer, &tmps, 2);
tmps = cpu_to_be16(header.transfer_type);
memcpy(buffer + 2, &tmps, 2);
tmpi = cpu_to_be32(header.pause);
memcpy(buffer + offset, &tmpi, sizeof(tmpi));
tmps = cpu_to_be16(header.mod_freq_count);
memcpy(buffer + offset + RR3_FREQ_COUNT_OFFSET, &tmps, 2);
buffer[offset + RR3_NUM_LENGTHS_OFFSET] = header.no_lengths;
tmps = cpu_to_be16(header.sig_size);
memcpy(buffer + offset + RR3_NUM_SIGS_OFFSET, &tmps, 2);
buffer[offset + RR3_REPEATS_OFFSET] = header.no_repeats;
lengths_ptr = (u16 *)(buffer + offset + RR3_HEADER_LENGTH);
for (i = 0; i < curlencheck; ++i)
lengths_ptr[i] = cpu_to_be16(sample_lens[i]);
datap = (u8 *)(buffer + offset + RR3_HEADER_LENGTH +
(sizeof(u16) * RR3_DRIVER_MAXLENS));
memcpy(datap, sigdata, (count + RR3_TX_TRAILER_LEN));
if (debug) {
redrat3_dump_signal_header(&header);
redrat3_dump_signal_data(buffer, header.sig_size);
}
irdata->header.length = cpu_to_be16(sendbuf_len -
sizeof(struct redrat3_header));
irdata->header.transfer_type = cpu_to_be16(RR3_MOD_SIGNAL_OUT);
irdata->pause = cpu_to_be32(redrat3_len_to_us(100));
irdata->mod_freq_count = cpu_to_be16(mod_freq_to_val(rr3->carrier));
irdata->no_lengths = curlencheck;
irdata->sig_size = cpu_to_be16(count + RR3_TX_TRAILER_LEN);
pipe = usb_sndbulkpipe(rr3->udev, rr3->ep_out->bEndpointAddress);
tmps = usb_bulk_msg(rr3->udev, pipe, buffer,
ret = usb_bulk_msg(rr3->udev, pipe, irdata,
sendbuf_len, &ret_len, 10 * HZ);
rr3_dbg(dev, "sent %d bytes, (ret %d)\n", ret_len, tmps);
rr3_dbg(dev, "sent %d bytes, (ret %d)\n", ret_len, ret);
/* now tell the hardware to transmit what we sent it */
pipe = usb_rcvctrlpipe(rr3->udev, 0);
ret = usb_control_msg(rr3->udev, pipe, RR3_TX_SEND_SIGNAL,
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
0, 0, buffer, 2, HZ * 10);
0, 0, irdata, 2, HZ * 10);
if (ret < 0)
dev_err(dev, "Error: control msg send failed, rc %d\n", ret);
......@@ -1035,8 +891,7 @@ static int redrat3_transmit_ir(struct rc_dev *rcdev, unsigned *txbuf,
out:
kfree(sample_lens);
kfree(buffer);
kfree(sigdata);
kfree(irdata);
rr3->transmitting = false;
/* rr3 re-enables rc detector because it was enabled before */
......
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