[PATCH 15/20] Input: iforce - allow callers supply data buffer when fetching device IDs
From: Dmitry Torokhov
Date: Mon Sep 17 2018 - 20:48:01 EST
We want to move buffer handling into transport layers as the properties of
buffers (DMA-safety, alignment, etc) are different for different
transports. To allow this, let's allow caller to specify their own buffers
for the results of iforce_get_id_packet() and let transport drivers to
figure what buffers they need to use for transfers.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
drivers/input/joystick/iforce/iforce-main.c | 27 ++++++++++---------
drivers/input/joystick/iforce/iforce-serio.c | 28 ++++++++++++++------
drivers/input/joystick/iforce/iforce-usb.c | 11 ++++----
drivers/input/joystick/iforce/iforce.h | 11 ++++----
4 files changed, 47 insertions(+), 30 deletions(-)
diff --git a/drivers/input/joystick/iforce/iforce-main.c b/drivers/input/joystick/iforce/iforce-main.c
index 9964aa8b3cdc..5cb3e80f4e0d 100644
--- a/drivers/input/joystick/iforce/iforce-main.c
+++ b/drivers/input/joystick/iforce/iforce-main.c
@@ -225,7 +225,9 @@ int iforce_init_device(struct device *parent, u16 bustype,
{
struct input_dev *input_dev;
struct ff_device *ff;
- unsigned char c[] = "CEOV";
+ u8 c[] = "CEOV";
+ u8 buf[IFORCE_MAX_LENGTH];
+ size_t len;
int i, error;
int ff_effects = 0;
@@ -269,7 +271,7 @@ int iforce_init_device(struct device *parent, u16 bustype,
*/
for (i = 0; i < 20; i++)
- if (!iforce_get_id_packet(iforce, "O"))
+ if (!iforce_get_id_packet(iforce, 'O', buf, &len))
break;
if (i == 20) { /* 5 seconds */
@@ -283,23 +285,23 @@ int iforce_init_device(struct device *parent, u16 bustype,
* Get device info.
*/
- if (!iforce_get_id_packet(iforce, "M"))
- input_dev->id.vendor = (iforce->edata[2] << 8) | iforce->edata[1];
+ if (!iforce_get_id_packet(iforce, 'M', buf, &len) || len < 3)
+ input_dev->id.vendor = (buf[2] << 8) | buf[1];
else
dev_warn(&iforce->dev->dev, "Device does not respond to id packet M\n");
- if (!iforce_get_id_packet(iforce, "P"))
- input_dev->id.product = (iforce->edata[2] << 8) | iforce->edata[1];
+ if (!iforce_get_id_packet(iforce, 'P', buf, &len) || len < 3)
+ input_dev->id.product = (buf[2] << 8) | buf[1];
else
dev_warn(&iforce->dev->dev, "Device does not respond to id packet P\n");
- if (!iforce_get_id_packet(iforce, "B"))
- iforce->device_memory.end = (iforce->edata[2] << 8) | iforce->edata[1];
+ if (!iforce_get_id_packet(iforce, 'B', buf, &len) || len < 3)
+ iforce->device_memory.end = (buf[2] << 8) | buf[1];
else
dev_warn(&iforce->dev->dev, "Device does not respond to id packet B\n");
- if (!iforce_get_id_packet(iforce, "N"))
- ff_effects = iforce->edata[1];
+ if (!iforce_get_id_packet(iforce, 'N', buf, &len) || len < 2)
+ ff_effects = buf[1];
else
dev_warn(&iforce->dev->dev, "Device does not respond to id packet N\n");
@@ -315,8 +317,9 @@ int iforce_init_device(struct device *parent, u16 bustype,
*/
for (i = 0; c[i]; i++)
- if (!iforce_get_id_packet(iforce, c + i))
- iforce_dump_packet(iforce, "info", iforce->ecmd, iforce->edata);
+ if (!iforce_get_id_packet(iforce, c[i], buf, &len))
+ iforce_dump_packet(iforce, "info",
+ (FF_CMD_QUERY & 0xff00) | len, buf);
/*
* Disable spring, enable force feedback.
diff --git a/drivers/input/joystick/iforce/iforce-serio.c b/drivers/input/joystick/iforce/iforce-serio.c
index 8d7eba9c9f0e..be44aed551f7 100644
--- a/drivers/input/joystick/iforce/iforce-serio.c
+++ b/drivers/input/joystick/iforce/iforce-serio.c
@@ -31,6 +31,8 @@ struct iforce_serio {
int idx, pkt, len, id;
u8 csum;
u8 expect_packet;
+ u8 cmd_response[IFORCE_MAX_LENGTH];
+ u8 cmd_response_len;
};
static void iforce_serio_xmit(struct iforce *iforce)
@@ -81,24 +83,34 @@ static void iforce_serio_xmit(struct iforce *iforce)
spin_unlock_irqrestore(&iforce->xmit_lock, flags);
}
-static int iforce_serio_get_id(struct iforce *iforce, u8 *packet)
+static int iforce_serio_get_id(struct iforce *iforce, u8 id,
+ u8 *response_data, size_t *response_len)
{
struct iforce_serio *iforce_serio = container_of(iforce,
struct iforce_serio,
iforce);
iforce_serio->expect_packet = HI(FF_CMD_QUERY);
- iforce_send_packet(iforce, FF_CMD_QUERY, packet);
+ iforce_serio->cmd_response_len = 0;
+
+ iforce_send_packet(iforce, FF_CMD_QUERY, &id);
wait_event_interruptible_timeout(iforce->wait,
!iforce_serio->expect_packet, HZ);
if (iforce_serio->expect_packet) {
iforce_serio->expect_packet = 0;
- return -EIO;
+ return -ETIMEDOUT;
}
- return -(iforce->edata[0] != packet[0]);
+ if (iforce_serio->cmd_response[0] != id)
+ return -EIO;
+
+ memcpy(response_data, iforce_serio->cmd_response,
+ iforce_serio->cmd_response_len);
+ *response_len = iforce_serio->cmd_response_len;
+
+ return 0;
}
static int iforce_serio_start_io(struct iforce *iforce)
@@ -127,7 +139,7 @@ static void iforce_serio_write_wakeup(struct serio *serio)
}
static irqreturn_t iforce_serio_irq(struct serio *serio,
- unsigned char data, unsigned int flags)
+ unsigned char data, unsigned int flags)
{
struct iforce_serio *iforce_serio = serio_get_drvdata(serio);
struct iforce *iforce = &iforce_serio->iforce;
@@ -166,9 +178,9 @@ static irqreturn_t iforce_serio_irq(struct serio *serio,
/* Handle command completion */
if (iforce_serio->expect_packet == iforce_serio->id) {
iforce_serio->expect_packet = 0;
- iforce->ecmd = (iforce_serio->id << 8) |
- iforce_serio->idx;
- memcpy(iforce->edata, iforce->data, IFORCE_MAX_LENGTH);
+ memcpy(iforce_serio->cmd_response, iforce->data,
+ IFORCE_MAX_LENGTH);
+ iforce_serio->cmd_response_len = iforce_serio->len;
/* Signal that command is done */
wake_up(&iforce->wait);
diff --git a/drivers/input/joystick/iforce/iforce-usb.c b/drivers/input/joystick/iforce/iforce-usb.c
index b3743fde2a3a..68155c4de412 100644
--- a/drivers/input/joystick/iforce/iforce-usb.c
+++ b/drivers/input/joystick/iforce/iforce-usb.c
@@ -87,7 +87,8 @@ static void iforce_usb_xmit(struct iforce *iforce)
__iforce_usb_xmit(iforce);
}
-static int iforce_usb_get_id(struct iforce *iforce, u8 *packet)
+static int iforce_usb_get_id(struct iforce *iforce, u8 id,
+ u8 *response_data, size_t *response_len)
{
struct iforce_usb *iforce_usb = container_of(iforce, struct iforce_usb,
iforce);
@@ -100,18 +101,18 @@ static int iforce_usb_get_id(struct iforce *iforce, u8 *packet)
status = usb_control_msg(iforce_usb->usbdev,
usb_rcvctrlpipe(iforce_usb->usbdev, 0),
- packet[0],
+ id,
USB_TYPE_VENDOR | USB_DIR_IN |
USB_RECIP_INTERFACE,
0, 0, buf, IFORCE_MAX_LENGTH, HZ);
if (status < 0) {
dev_err(&iforce_usb->intf->dev,
"usb_submit_urb failed: %d\n", status);
- } else if (buf[0] != packet[0]) {
+ } else if (buf[0] != id) {
status = -EIO;
} else {
- iforce->ecmd = 0xff00 | status;
- memcpy(iforce->edata, buf, status);
+ memcpy(response_data, buf, status);
+ *response_len = status;
status = 0;
}
diff --git a/drivers/input/joystick/iforce/iforce.h b/drivers/input/joystick/iforce/iforce.h
index ce3c6aead8b6..68558c594e54 100644
--- a/drivers/input/joystick/iforce/iforce.h
+++ b/drivers/input/joystick/iforce/iforce.h
@@ -95,7 +95,8 @@ struct iforce;
struct iforce_xport_ops {
void (*xmit)(struct iforce *iforce);
- int (*get_id)(struct iforce *iforce, u8* id);
+ int (*get_id)(struct iforce *iforce, u8 id,
+ u8 *response_data, size_t *response_len);
int (*start_io)(struct iforce *iforce);
void (*stop_io)(struct iforce *iforce);
};
@@ -107,8 +108,6 @@ struct iforce {
int bus;
unsigned char data[IFORCE_MAX_LENGTH];
- unsigned char edata[IFORCE_MAX_LENGTH];
- u16 ecmd;
spinlock_t xmit_lock;
/* Buffer used for asynchronous sending of bytes to the device */
@@ -135,9 +134,11 @@ struct iforce {
/* Encode a time value */
#define TIME_SCALE(a) (a)
-static inline int iforce_get_id_packet(struct iforce *iforce, u8* id)
+static inline int iforce_get_id_packet(struct iforce *iforce, u8 id,
+ u8 *response_data, size_t *response_len)
{
- return iforce->xport_ops->get_id(iforce, id);
+ return iforce->xport_ops->get_id(iforce, id,
+ response_data, response_len);
}
/* Public functions */
--
2.19.0.397.gdd90340f6a-goog