Some of these chips have GNSS support. In some vendor kernels
a driver on top of misc/ti-st can be found providing a /dev/tigps
device which speaks the secretive Air Independent Interface (AI2) protocol.
To be more compatible with userspace send out NMEA by default but
allow a more raw mode by using a module parameter.
This was tested on the Epson Moverio BT-200.
Changes since V2:
- Optimize waits
- Fix some packet analysis / checksum computation issue
- Adding a proposal for removing those waits as RFC
- Minor spell corrections and improved descriptions
Changes since V1:
- Set up things for NMEA output
- Powerup/down at open()/close()
- split out logic between drivers/bluetooth and drivers/gnss
- leave out drivers/misc/ti-st driver removal to avoid
filling up mailboxes during the iterations, this series is
still a proof that it is not needed, will take the brush after
this series is accepted.
Andreas Kemnade (4):
gnss: Add AI2 protocol used by some TI combo chips.
Bluetooth: ti-st: Add GNSS subdevice for TI Wilink chips
gnss: Add driver for AI2 protocol
gnss: ai2: replace long sleeps by wait for acks
drivers/bluetooth/hci_ll.c | 81 +++++
drivers/gnss/Kconfig | 13 +
drivers/gnss/Makefile | 3 +
drivers/gnss/ai2.c | 560 +++++++++++++++++++++++++++++++++++
drivers/gnss/core.c | 1 +
include/linux/gnss.h | 1 +
include/linux/ti_wilink_st.h | 8 +
7 files changed, 667 insertions(+)
create mode 100644 drivers/gnss/ai2.c
--
2.39.2
Some of these chips have GNSS support. GNSS support is available through
channel 9 whilst FM is through channel 8. Add a platform subdevice for
GNSS so that a driver for that functionality can be build. To avoid having
useless GNSS devices, do it only when the devicetree node name contains
gnss.
Signed-off-by: Andreas Kemnade <[email protected]>
Reviewed-by: Paul Menzel <[email protected]>
---
drivers/bluetooth/hci_ll.c | 81 ++++++++++++++++++++++++++++++++++++
include/linux/ti_wilink_st.h | 8 ++++
2 files changed, 89 insertions(+)
diff --git a/drivers/bluetooth/hci_ll.c b/drivers/bluetooth/hci_ll.c
index 4a0b5c3160c2b..09e5a4dbd2f8c 100644
--- a/drivers/bluetooth/hci_ll.c
+++ b/drivers/bluetooth/hci_ll.c
@@ -32,6 +32,7 @@
#include <linux/signal.h>
#include <linux/ioctl.h>
#include <linux/of.h>
+#include <linux/platform_device.h>
#include <linux/serdev.h>
#include <linux/skbuff.h>
#include <linux/ti_wilink_st.h>
@@ -68,6 +69,9 @@ struct ll_device {
struct gpio_desc *enable_gpio;
struct clk *ext_clk;
bdaddr_t bdaddr;
+
+ void (*gnss_recv_func)(struct device *dev, struct sk_buff *skb);
+ struct platform_device *gnssdev;
};
struct ll_struct {
@@ -78,6 +82,8 @@ struct ll_struct {
struct sk_buff_head tx_wait_q; /* HCILL wait queue */
};
+static int ll_gnss_register(struct ll_device *lldev);
+static int ll_gnss_recv_frame(struct hci_dev *hdev, struct sk_buff *skb);
/*
* Builds and sends an HCILL command packet.
* These are very simple packets with only 1 cmd byte
@@ -411,6 +417,13 @@ static int ll_recv_frame(struct hci_dev *hdev, struct sk_buff *skb)
.lsize = 0, \
.maxlen = 0
+#define LL_RECV_GNSS \
+ .type = 9, \
+ .hlen = 3, \
+ .loff = 1, \
+ .lsize = 2
+
+
static const struct h4_recv_pkt ll_recv_pkts[] = {
{ H4_RECV_ACL, .recv = hci_recv_frame },
{ H4_RECV_SCO, .recv = hci_recv_frame },
@@ -419,6 +432,7 @@ static const struct h4_recv_pkt ll_recv_pkts[] = {
{ LL_RECV_SLEEP_ACK, .recv = ll_recv_frame },
{ LL_RECV_WAKE_IND, .recv = ll_recv_frame },
{ LL_RECV_WAKE_ACK, .recv = ll_recv_frame },
+ { LL_RECV_GNSS, .recv = ll_gnss_recv_frame },
};
/* Recv data */
@@ -677,9 +691,69 @@ static int ll_setup(struct hci_uart *hu)
}
}
+ if (strstr(of_node_full_name(serdev->dev.of_node), "gnss"))
+ ll_gnss_register(lldev);
+
+ return 0;
+}
+
+struct hci_dev *st_get_hci(struct device *dev)
+{
+ struct ll_device *lldev = dev_get_drvdata(dev);
+
+ return lldev->hu.hdev;
+}
+EXPORT_SYMBOL(st_get_hci);
+
+void st_set_gnss_recv_func(struct device *dev,
+ void (*recv_frame)(struct device *, struct sk_buff *))
+{
+ struct ll_device *lldev = dev_get_drvdata(dev);
+
+ lldev->gnss_recv_func = recv_frame;
+}
+EXPORT_SYMBOL(st_set_gnss_recv_func);
+
+static int ll_gnss_recv_frame(struct hci_dev *hdev, struct sk_buff *skb)
+{
+ struct hci_uart *hu = hci_get_drvdata(hdev);
+ struct ll_device *lldev = container_of(hu, struct ll_device, hu);
+
+ if (!lldev->gnssdev)
+ return 0;
+
+ if (lldev->gnss_recv_func) {
+ lldev->gnss_recv_func(&lldev->gnssdev->dev, skb);
+ return 0;
+ }
+ kfree_skb(skb);
+
return 0;
}
+static int ll_gnss_register(struct ll_device *lldev)
+{
+ struct platform_device *pdev;
+ int ret;
+
+ pdev = platform_device_alloc("ti-ai2-gnss", PLATFORM_DEVID_AUTO);
+ if (!pdev)
+ return -ENOMEM;
+
+ pdev->dev.parent = &lldev->serdev->dev;
+ lldev->gnssdev = pdev;
+ ret = platform_device_add(pdev);
+ if (ret)
+ goto err;
+
+ return 0;
+
+err:
+ lldev->gnssdev = NULL;
+ platform_device_put(pdev);
+ return ret;
+}
+
static const struct hci_uart_proto llp;
static int hci_ti_probe(struct serdev_device *serdev)
@@ -757,12 +831,19 @@ static int hci_ti_probe(struct serdev_device *serdev)
}
return hci_uart_register_device(hu, &llp);
+
+
+ return 0;
}
+
static void hci_ti_remove(struct serdev_device *serdev)
{
struct ll_device *lldev = serdev_device_get_drvdata(serdev);
+ if (lldev->gnssdev)
+ platform_device_unregister(lldev->gnssdev);
+
hci_uart_unregister_device(&lldev->hu);
}
diff --git a/include/linux/ti_wilink_st.h b/include/linux/ti_wilink_st.h
index 10642d4844f0c..eccc2db004069 100644
--- a/include/linux/ti_wilink_st.h
+++ b/include/linux/ti_wilink_st.h
@@ -381,6 +381,14 @@ unsigned long st_ll_getstate(struct st_data_s *);
unsigned long st_ll_sleep_state(struct st_data_s *, unsigned char);
void st_ll_wakeup(struct st_data_s *);
+/**
+ * various funcs used to interact between FM, GPS and BT
+ */
+struct hci_dev *st_get_hci(struct device *dev);
+void st_set_gnss_recv_func(struct device *dev,
+ void (*recv_frame)(struct device *, struct sk_buff *));
+
+
/*
* header information used by st_core.c for FM and GPS
* packet parsing, the bluetooth headers are already available
--
2.39.2
Texas Instruments uses something called Air Independent Interface (AI2) for
their WLAN/BT/GPS combo chips.
No public documentation is available, but allow that protocol to be
specified.
Signed-off-by: Andreas Kemnade <[email protected]>
Reviewed-by: Paul Menzel <[email protected]>
---
drivers/gnss/core.c | 1 +
include/linux/gnss.h | 1 +
2 files changed, 2 insertions(+)
diff --git a/drivers/gnss/core.c b/drivers/gnss/core.c
index 48f2ee0f78c4d..cac9f45aec4b2 100644
--- a/drivers/gnss/core.c
+++ b/drivers/gnss/core.c
@@ -335,6 +335,7 @@ static const char * const gnss_type_names[GNSS_TYPE_COUNT] = {
[GNSS_TYPE_SIRF] = "SiRF",
[GNSS_TYPE_UBX] = "UBX",
[GNSS_TYPE_MTK] = "MTK",
+ [GNSS_TYPE_AI2] = "AI2",
};
static const char *gnss_type_name(const struct gnss_device *gdev)
diff --git a/include/linux/gnss.h b/include/linux/gnss.h
index 36968a0f33e8d..16b565dab83ea 100644
--- a/include/linux/gnss.h
+++ b/include/linux/gnss.h
@@ -23,6 +23,7 @@ enum gnss_type {
GNSS_TYPE_SIRF,
GNSS_TYPE_UBX,
GNSS_TYPE_MTK,
+ GNSS_TYPE_AI2,
GNSS_TYPE_COUNT
};
--
2.39.2
Add a driver for the Air Independent Interface protocol used by some TI
Wilink combo chips. Per default, send out just NMEA to userspace and turn
on/off things at open()/close() but keep the door open for any
sophisticated development regarding the AI2 protocol by having a kernel
parameter to turn it into raw mode (ai2raw) resembling /dev/tigps provided
by some TI vendor kernels.
The fork used by the BT200 is at:
http://epsonservice.goepson.com/downloads/VI-APS/BT200_kernel.tgz
Signed-off-by: Andreas Kemnade <[email protected]>
Acked-by: Paul Menzel <[email protected]>
---
drivers/gnss/Kconfig | 13 ++
drivers/gnss/Makefile | 3 +
drivers/gnss/ai2.c | 527 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 543 insertions(+)
create mode 100644 drivers/gnss/ai2.c
diff --git a/drivers/gnss/Kconfig b/drivers/gnss/Kconfig
index d7fe265c28696..95fdab6e7ae94 100644
--- a/drivers/gnss/Kconfig
+++ b/drivers/gnss/Kconfig
@@ -65,4 +65,17 @@ config GNSS_USB
If unsure, say N.
+config GNSS_AI2
+ tristate "TI AI2 procotol support"
+ depends on BT_HCIUART_LL
+ help
+ Say Y here if you have a Texas Instruments Wilink combo chip
+ containing among other things a GNSS receiver speaking the
+ Air Independent Interface (AI2) protocol.
+
+ To compile this driver as a module, choose M here: the module will
+ be called gnss-ai2.
+
+ If unsure, say N.
+
endif # GNSS
diff --git a/drivers/gnss/Makefile b/drivers/gnss/Makefile
index bb2cbada34359..bf6fefcb2e823 100644
--- a/drivers/gnss/Makefile
+++ b/drivers/gnss/Makefile
@@ -20,3 +20,6 @@ gnss-ubx-y := ubx.o
obj-$(CONFIG_GNSS_USB) += gnss-usb.o
gnss-usb-y := usb.o
+
+obj-$(CONFIG_GNSS_AI2) += gnss-ai2.o
+gnss-ai2-y := ai2.o
diff --git a/drivers/gnss/ai2.c b/drivers/gnss/ai2.c
new file mode 100644
index 0000000000000..0cc21b64b7c3f
--- /dev/null
+++ b/drivers/gnss/ai2.c
@@ -0,0 +1,527 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Texas Instruments AI2 (Air independent interface) protocol device driver
+ * Used for some TI WLAN/Bluetooth/GNSS combo chips.
+ *
+ * Copyright (C) 2024 Andreas Kemnade <[email protected]>
+ */
+#include <linux/errno.h>
+#include <linux/gnss.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/ti_wilink_st.h>
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+
+/* Channel-9 details for GPS */
+#define GPS_CH9_PKT_NUMBER 0x9
+#define GPS_CH9_OP_WRITE 0x1
+#define GPS_CH9_OP_READ 0x2
+#define GPS_CH9_OP_COMPLETED_EVT 0x3
+
+/* arbitarily chosen, should fit everything seen in the past */
+#define MAX_AI2_FRAME_SIZE 2048
+
+#define AI2_ESCAPE 0x10 /* if sent as data, it is doubled */
+#define AI2_END_MARKER 0x3
+#define AI2_ACK 0x2
+
+/* reports */
+#define AI2_REPORT_NMEA 0xd3
+
+#define NMEA_HEADER_LEN 4
+
+/* commands */
+#define AI2_CMD_RECEIVER_STATE 2
+
+#define RECEIVER_STATE_OFF 1
+#define RECEIVER_STATE_IDLE 2
+#define RECEIVER_STATE_ON 3
+
+#define AI2_CMD_CONFIG_NMEA 0xe5
+#define NMEA_MASK_GGA (1 << 0)
+#define NMEA_MASK_GLL (1 << 1)
+#define NMEA_MASK_GSA (1 << 2)
+#define NMEA_MASK_GSV (1 << 3)
+#define NMEA_MASK_RMC (1 << 4)
+#define NMEA_MASK_VTG (1 << 5)
+
+#define NMEA_MASK_ALL (NMEA_MASK_GGA | \
+ NMEA_MASK_GLL | \
+ NMEA_MASK_GSA | \
+ NMEA_MASK_GSV | \
+ NMEA_MASK_RMC | \
+ NMEA_MASK_VTG)
+
+
+static bool ai2raw;
+
+struct ai2_device {
+ struct mutex gdev_mutex;
+ bool gdev_open;
+ struct gnss_device *gdev;
+ struct device *dev;
+ struct sk_buff *recv_skb;
+ bool recv_esc;
+};
+
+static struct sk_buff *ai2_skb_alloc(unsigned int len, gfp_t how)
+{
+ struct sk_buff *skb;
+
+ skb = bt_skb_alloc(len + sizeof(struct gps_event_hdr), how);
+ if (skb)
+ skb_reserve(skb, sizeof(struct gps_event_hdr));
+
+ return skb;
+}
+
+static int ai2_send_frame(struct ai2_device *ai2dev,
+ struct sk_buff *skb)
+{
+ int len;
+ struct gps_event_hdr *gnssdrv_hdr;
+ struct hci_dev *hdev;
+
+ if (skb->len >= U16_MAX)
+ return -EINVAL;
+
+ /*
+ * note: fragmentation at this point not handled yet
+ * not needed for simple config commands
+ */
+ len = skb->len;
+ gnssdrv_hdr = skb_push(skb, sizeof(struct gps_event_hdr));
+ gnssdrv_hdr->opcode = GPS_CH9_OP_WRITE;
+ gnssdrv_hdr->plen = __cpu_to_le16(len);
+
+ hci_skb_pkt_type(skb) = GPS_CH9_PKT_NUMBER;
+ hdev = st_get_hci(ai2dev->dev->parent);
+ return hdev->send(hdev, skb);
+}
+
+static void ai2_put_escaped(struct sk_buff *skb, u8 d)
+{
+ skb_put_u8(skb, d);
+ if (d == 0x10)
+ skb_put_u8(skb, d);
+}
+
+static struct sk_buff *ai2_compose_frame(bool request_ack,
+ u8 cmd,
+ const u8 *data,
+ int len)
+{
+ u16 sum;
+ int i;
+ /* duplicate the length to have space for worst case escaping */
+ struct sk_buff *skb = ai2_skb_alloc(2 + len * 2 + 2 + 2, GFP_KERNEL);
+
+ skb_put_u8(skb, AI2_ESCAPE);
+ skb_put_u8(skb, request_ack ? 1 : 0);
+
+ sum = AI2_ESCAPE;
+ if (request_ack)
+ sum++;
+
+ ai2_put_escaped(skb, cmd);
+ sum += cmd;
+
+ ai2_put_escaped(skb, len & 0xff);
+ sum += len & 0xff;
+
+ ai2_put_escaped(skb, len >> 8);
+ sum += len >> 8;
+
+ for (i = 0; i < len; i++) {
+ sum += data[i];
+ ai2_put_escaped(skb, data[i]);
+ }
+
+ ai2_put_escaped(skb, sum & 0xFF);
+ ai2_put_escaped(skb, sum >> 8);
+ skb_put_u8(skb, AI2_ESCAPE);
+ skb_put_u8(skb, AI2_END_MARKER);
+
+ return skb;
+}
+
+static int ai2_set_receiver_state(struct ai2_device *ai2dev,
+ uint8_t state)
+{
+ struct sk_buff *skb = ai2_compose_frame(true, AI2_CMD_RECEIVER_STATE,
+ &state, 1);
+ if (!skb)
+ return -ENOMEM;
+
+ return ai2_send_frame(ai2dev, skb);
+}
+
+static int ai2_config_nmea_reports(struct ai2_device *ai2dev,
+ uint8_t mask)
+{
+ u8 buf[4] = {0};
+ struct sk_buff *skb;
+
+ buf[0] = mask;
+ skb = ai2_compose_frame(true, AI2_CMD_CONFIG_NMEA,
+ buf, sizeof(buf));
+ if (!skb)
+ return -ENOMEM;
+
+ return ai2_send_frame(ai2dev, skb);
+}
+
+/*
+ * Unknown commands, give some version information, must be sent
+ * once, not sure what undoes them besides resetting the whole
+ * bluetooth part, but no signs of significant things being still
+ * turned on without undoing this.
+ */
+static int gnss_ai2_init(struct ai2_device *ai2dev)
+{
+ int ret;
+ u8 d = 0x01;
+ struct sk_buff *skb = ai2_compose_frame(true, 0xf5, &d, 1);
+
+ if (!skb)
+ return -ENOMEM;
+
+ ret = ai2_send_frame(ai2dev, skb);
+ if (ret)
+ return ret;
+
+ msleep(200); /* seen some 60ms response time here, so wait a bit */
+ d = 5;
+ skb = ai2_compose_frame(true, 0xf1, &d, 1);
+ if (!skb)
+ return -ENOMEM;
+
+ return ai2_send_frame(ai2dev, skb);
+}
+
+static int gnss_ai2_open(struct gnss_device *gdev)
+{
+ struct ai2_device *ai2dev = gnss_get_drvdata(gdev);
+ int ret;
+
+ mutex_lock(&ai2dev->gdev_mutex);
+ ai2dev->gdev_open = true;
+ mutex_unlock(&ai2dev->gdev_mutex);
+ if (ai2raw)
+ return 0;
+
+ ret = gnss_ai2_init(ai2dev);
+ if (ret)
+ goto err;
+
+ /* TODO: find out on what kind of ack we should wait */
+ msleep(50);
+ ret = ai2_set_receiver_state(ai2dev, RECEIVER_STATE_IDLE);
+ if (ret)
+ goto err;
+
+ msleep(100);
+ ret = ai2_config_nmea_reports(ai2dev, NMEA_MASK_ALL);
+ if (ret)
+ goto err;
+
+ msleep(50);
+ ret = ai2_set_receiver_state(ai2dev, RECEIVER_STATE_ON);
+ if (ret)
+ goto err;
+
+ msleep(50);
+
+ return 0;
+err:
+ mutex_lock(&ai2dev->gdev_mutex);
+ ai2dev->gdev_open = false;
+ if (ai2dev->recv_skb)
+ kfree_skb(ai2dev->recv_skb);
+
+ ai2dev->recv_skb = NULL;
+ mutex_unlock(&ai2dev->gdev_mutex);
+ return ret;
+}
+
+static void gnss_ai2_close(struct gnss_device *gdev)
+{
+ struct ai2_device *ai2dev = gnss_get_drvdata(gdev);
+
+ /* TODO: find out on what kind of ack we should wait */
+ if (!ai2raw) {
+ msleep(50);
+ ai2_set_receiver_state(ai2dev, RECEIVER_STATE_IDLE);
+ msleep(50);
+ ai2_set_receiver_state(ai2dev, RECEIVER_STATE_OFF);
+ msleep(200); /* seen some longer response time here, so wait */
+ }
+
+ mutex_lock(&ai2dev->gdev_mutex);
+ ai2dev->gdev_open = false;
+ if (ai2dev->recv_skb)
+ kfree_skb(ai2dev->recv_skb);
+
+ ai2dev->recv_skb = NULL;
+ mutex_unlock(&ai2dev->gdev_mutex);
+}
+
+
+static int gnss_ai2_write_raw(struct gnss_device *gdev,
+ const unsigned char *buf, size_t count)
+{
+ struct ai2_device *ai2dev = gnss_get_drvdata(gdev);
+ int err = 0;
+ struct sk_buff *skb = NULL;
+
+ if (!ai2raw)
+ return -EPERM;
+
+ /* allocate packet */
+ skb = ai2_skb_alloc(count, GFP_KERNEL);
+ if (!skb) {
+ BT_ERR("cannot allocate memory for HCILL packet");
+ err = -ENOMEM;
+ goto out;
+ }
+
+ skb_put_data(skb, buf, count);
+
+ err = ai2_send_frame(ai2dev, skb);
+ if (err)
+ goto out;
+
+ return count;
+out:
+ return err;
+}
+
+static const struct gnss_operations gnss_ai2_ops = {
+ .open = gnss_ai2_open,
+ .close = gnss_ai2_close,
+ .write_raw = gnss_ai2_write_raw,
+};
+
+static void process_ai2_packet(struct ai2_device *ai2dev,
+ u8 cmd, u8 *data, u16 len)
+{
+ if (cmd != AI2_REPORT_NMEA)
+ return;
+
+ if (len <= NMEA_HEADER_LEN)
+ return;
+
+ len -= NMEA_HEADER_LEN;
+ data += NMEA_HEADER_LEN;
+
+ gnss_insert_raw(ai2dev->gdev, data, len);
+}
+
+/* do some sanity checks and split frame into packets */
+static void process_ai2_frame(struct ai2_device *ai2dev)
+{
+ u16 sum;
+ int i;
+ u8 *head;
+ u8 *data;
+
+ sum = 0;
+ data = ai2dev->recv_skb->data;
+ for (i = 0; i < ai2dev->recv_skb->len - 2; i++)
+ sum += data[i];
+
+ print_hex_dump_bytes("ai2 frame: ", DUMP_PREFIX_OFFSET, data, ai2dev->recv_skb->len);
+
+ if (get_unaligned_le16(data + i) != sum) {
+ dev_dbg(ai2dev->dev,
+ "checksum error in reception, dropping frame\n");
+ return;
+ }
+
+ /* reached if byte 1 in the command packet is set to 1 */
+ if (data[1] == AI2_ACK)
+ return;
+
+ head = skb_pull(ai2dev->recv_skb, 2); /* drop frame start marker */
+ while (head && (ai2dev->recv_skb->len >= 3)) {
+ u8 cmd;
+ u16 pktlen;
+
+ cmd = head[0];
+ pktlen = get_unaligned_le16(head + 1);
+ data = skb_pull(ai2dev->recv_skb, 3);
+ if (!data)
+ break;
+
+ if (pktlen > ai2dev->recv_skb->len)
+ break;
+
+ head = skb_pull(ai2dev->recv_skb, pktlen);
+
+ process_ai2_packet(ai2dev, cmd, data, pktlen);
+ }
+}
+
+static void process_ai2_data(struct ai2_device *ai2dev,
+ u8 *data, int len)
+{
+ int i;
+
+ for (i = 0; i < len; i++) {
+ if (!ai2dev->recv_skb) {
+ ai2dev->recv_esc = false;
+ if (data[i] != AI2_ESCAPE) {
+ dev_dbg(ai2dev->dev, "dropping data, trying to resync\n");
+ continue;
+ }
+ ai2dev->recv_skb = alloc_skb(MAX_AI2_FRAME_SIZE, GFP_KERNEL);
+ if (!ai2dev->recv_skb)
+ return;
+
+ dev_dbg(ai2dev->dev, "starting packet\n");
+
+ /* this initial AI2_ESCAPE is part of checksum computation */
+ skb_put_u8(ai2dev->recv_skb, data[i]);
+ continue;
+ }
+ if (ai2dev->recv_skb->len == 1) {
+ if (data[i] == AI2_END_MARKER) {
+ dev_dbg(ai2dev->dev, "unexpected end of frame received\n");
+ kfree_skb(ai2dev->recv_skb);
+ ai2dev->recv_skb = NULL;
+ continue;
+ }
+ skb_put_u8(ai2dev->recv_skb, data[i]);
+ } else {
+ /* drop one of two AI2_ESCAPE */
+ if ((!ai2dev->recv_esc) &&
+ (data[i] == AI2_ESCAPE)) {
+ ai2dev->recv_esc = true;
+ continue;
+ }
+
+ if (ai2dev->recv_esc &&
+ (data[i] == AI2_END_MARKER)) {
+ process_ai2_frame(ai2dev);
+ kfree_skb(ai2dev->recv_skb);
+ ai2dev->recv_skb = NULL;
+ continue;
+ }
+
+ ai2dev->recv_esc = false;
+ skb_put_u8(ai2dev->recv_skb, data[i]);
+ }
+ }
+}
+
+static void gnss_recv_frame(struct device *dev, struct sk_buff *skb)
+{
+ struct ai2_device *ai2dev = dev_get_drvdata(dev);
+ struct gps_event_hdr *gnss_hdr;
+ u8 *data;
+
+ if (!ai2dev->gdev) {
+ kfree_skb(skb);
+ return;
+ }
+
+ gnss_hdr = (struct gps_event_hdr *)skb->data;
+
+ data = skb_pull(skb, sizeof(*gnss_hdr));
+ /*
+ * REVISIT: maybe do something with the completed
+ * event
+ */
+ if (gnss_hdr->opcode == GPS_CH9_OP_READ) {
+ mutex_lock(&ai2dev->gdev_mutex);
+ if (ai2dev->gdev_open) {
+ if (ai2raw)
+ gnss_insert_raw(ai2dev->gdev, data, skb->len);
+ else
+ process_ai2_data(ai2dev, data, skb->len);
+ } else {
+ dev_dbg(ai2dev->dev,
+ "receiving data while chip should be off\n");
+ }
+ mutex_unlock(&ai2dev->gdev_mutex);
+ }
+ kfree_skb(skb);
+}
+
+static int gnss_ai2_probe(struct platform_device *pdev)
+{
+ struct gnss_device *gdev;
+ struct ai2_device *ai2dev;
+ int ret;
+
+ ai2dev = devm_kzalloc(&pdev->dev, sizeof(*ai2dev), GFP_KERNEL);
+ if (!ai2dev)
+ return -ENOMEM;
+
+ ai2dev->dev = &pdev->dev;
+ gdev = gnss_allocate_device(&pdev->dev);
+ if (!gdev)
+ return -ENOMEM;
+
+ gdev->ops = &gnss_ai2_ops;
+ gdev->type = ai2raw ? GNSS_TYPE_AI2 : GNSS_TYPE_NMEA;
+ gnss_set_drvdata(gdev, ai2dev);
+ platform_set_drvdata(pdev, ai2dev);
+ st_set_gnss_recv_func(pdev->dev.parent, gnss_recv_frame);
+ mutex_init(&ai2dev->gdev_mutex);
+
+ ret = gnss_register_device(gdev);
+ if (ret)
+ goto err;
+
+ ai2dev->gdev = gdev;
+ return 0;
+
+err:
+ st_set_gnss_recv_func(pdev->dev.parent, NULL);
+
+ if (ai2dev->recv_skb)
+ kfree_skb(ai2dev->recv_skb);
+
+ gnss_put_device(gdev);
+ return ret;
+}
+
+static void gnss_ai2_remove(struct platform_device *pdev)
+{
+ struct ai2_device *ai2dev = platform_get_drvdata(pdev);
+
+ st_set_gnss_recv_func(pdev->dev.parent, NULL);
+ gnss_deregister_device(ai2dev->gdev);
+ gnss_put_device(ai2dev->gdev);
+ if (ai2dev->recv_skb)
+ kfree_skb(ai2dev->recv_skb);
+}
+
+static const struct platform_device_id gnss_ai2_id[] = {
+ {
+ .name = "ti-ai2-gnss"
+ }, {
+ /* sentinel */
+ }
+};
+MODULE_DEVICE_TABLE(platform, gnss_ai2_id);
+
+static struct platform_driver gnss_ai2_driver = {
+ .driver = {
+ .name = "gnss-ai2",
+ },
+ .probe = gnss_ai2_probe,
+ .remove_new = gnss_ai2_remove,
+ .id_table = gnss_ai2_id,
+};
+module_platform_driver(gnss_ai2_driver);
+
+module_param(ai2raw, bool, 0600);
+MODULE_DESCRIPTION("AI2 GNSS driver");
+MODULE_LICENSE("GPL");
--
2.39.2
Previously there were long sleeps for everything sent out.
Replace the sleeps by some wait for completion.
Wait times like 60ms are seen.
There are ack packets sent out if requested. Unfortunately
just waiting for them seems not stable, some open()/close()
loop stress-testing brings the communication into complete
disorder. Unfortunately these ack packets arrive before
a complete answer of the command has been received but
apparently after some processing has been done.
Properly declaring expected answers might help but adding
that can only be justified after some wider testing.
So leaving this part of the series as a RFC and base
for future optimzations.
Signed-off-by: Andreas Kemnade <[email protected]>
---
drivers/gnss/ai2.c | 111 +++++++++++++++++++++++++++++----------------
1 file changed, 72 insertions(+), 39 deletions(-)
diff --git a/drivers/gnss/ai2.c b/drivers/gnss/ai2.c
index 0cc21b64b7c3f..19597ee891881 100644
--- a/drivers/gnss/ai2.c
+++ b/drivers/gnss/ai2.c
@@ -5,6 +5,8 @@
*
* Copyright (C) 2024 Andreas Kemnade <[email protected]>
*/
+#define DEBUG
+#include <linux/completion.h>
#include <linux/errno.h>
#include <linux/gnss.h>
#include <linux/init.h>
@@ -67,6 +69,16 @@ struct ai2_device {
struct device *dev;
struct sk_buff *recv_skb;
bool recv_esc;
+ /*
+ * completion for the lower level around
+ * GPS_CH9_OP_COMPLETED_EVT
+ * probably more important if we send large
+ * fragmented packets
+ */
+ struct completion ch9_complete;
+
+ /* completion for AI2 ack packets */
+ struct completion ai2_ack_complete;
};
static struct sk_buff *ai2_skb_alloc(unsigned int len, gfp_t how)
@@ -86,6 +98,7 @@ static int ai2_send_frame(struct ai2_device *ai2dev,
int len;
struct gps_event_hdr *gnssdrv_hdr;
struct hci_dev *hdev;
+ int ret;
if (skb->len >= U16_MAX)
return -EINVAL;
@@ -95,13 +108,25 @@ static int ai2_send_frame(struct ai2_device *ai2dev,
* not needed for simple config commands
*/
len = skb->len;
+ print_hex_dump_bytes("ai2 send frame: ", DUMP_PREFIX_OFFSET, skb->data, skb->len);
+
gnssdrv_hdr = skb_push(skb, sizeof(struct gps_event_hdr));
gnssdrv_hdr->opcode = GPS_CH9_OP_WRITE;
gnssdrv_hdr->plen = __cpu_to_le16(len);
-
hci_skb_pkt_type(skb) = GPS_CH9_PKT_NUMBER;
hdev = st_get_hci(ai2dev->dev->parent);
- return hdev->send(hdev, skb);
+ reinit_completion(&ai2dev->ch9_complete);
+
+ ret = hdev->send(hdev, skb);
+ if (ret)
+ return ret;
+
+ if (!wait_for_completion_timeout(&ai2dev->ch9_complete,
+ msecs_to_jiffies(2000)))
+ return -ETIMEDOUT;
+ dev_dbg(ai2dev->dev, "send finished\n");
+
+ return 0;
}
static void ai2_put_escaped(struct sk_buff *skb, u8 d)
@@ -150,30 +175,50 @@ static struct sk_buff *ai2_compose_frame(bool request_ack,
return skb;
}
-static int ai2_set_receiver_state(struct ai2_device *ai2dev,
- uint8_t state)
+static int ai2_compose_send_frame(struct ai2_device *ai2dev,
+ bool request_ack,
+ u8 cmd,
+ const u8 *data,
+ int len)
{
- struct sk_buff *skb = ai2_compose_frame(true, AI2_CMD_RECEIVER_STATE,
- &state, 1);
+ struct sk_buff *skb = ai2_compose_frame(request_ack, cmd, data, len);
if (!skb)
return -ENOMEM;
+ if (request_ack) {
+ int ret;
+
+ reinit_completion(&ai2dev->ai2_ack_complete);
+
+ ret = ai2_send_frame(ai2dev, skb);
+ if (ret)
+ return ret;
+
+ if (!wait_for_completion_timeout(&ai2dev->ai2_ack_complete,
+ msecs_to_jiffies(2000)))
+ return -ETIMEDOUT;
+
+ return 0;
+ }
+
return ai2_send_frame(ai2dev, skb);
}
+static int ai2_set_receiver_state(struct ai2_device *ai2dev,
+ uint8_t state)
+{
+ return ai2_compose_send_frame(ai2dev, true, AI2_CMD_RECEIVER_STATE,
+ &state, 1);
+}
+
static int ai2_config_nmea_reports(struct ai2_device *ai2dev,
uint8_t mask)
{
u8 buf[4] = {0};
- struct sk_buff *skb;
buf[0] = mask;
- skb = ai2_compose_frame(true, AI2_CMD_CONFIG_NMEA,
- buf, sizeof(buf));
- if (!skb)
- return -ENOMEM;
-
- return ai2_send_frame(ai2dev, skb);
+ return ai2_compose_send_frame(ai2dev, true, AI2_CMD_CONFIG_NMEA,
+ buf, sizeof(buf));
}
/*
@@ -186,22 +231,12 @@ static int gnss_ai2_init(struct ai2_device *ai2dev)
{
int ret;
u8 d = 0x01;
- struct sk_buff *skb = ai2_compose_frame(true, 0xf5, &d, 1);
-
- if (!skb)
- return -ENOMEM;
-
- ret = ai2_send_frame(ai2dev, skb);
+ ret = ai2_compose_send_frame(ai2dev, true, 0xf5, &d, 1);
if (ret)
return ret;
- msleep(200); /* seen some 60ms response time here, so wait a bit */
d = 5;
- skb = ai2_compose_frame(true, 0xf1, &d, 1);
- if (!skb)
- return -ENOMEM;
-
- return ai2_send_frame(ai2dev, skb);
+ return ai2_compose_send_frame(ai2dev, true, 0xf1, &d, 1);
}
static int gnss_ai2_open(struct gnss_device *gdev)
@@ -219,18 +254,14 @@ static int gnss_ai2_open(struct gnss_device *gdev)
if (ret)
goto err;
- /* TODO: find out on what kind of ack we should wait */
- msleep(50);
ret = ai2_set_receiver_state(ai2dev, RECEIVER_STATE_IDLE);
if (ret)
goto err;
- msleep(100);
ret = ai2_config_nmea_reports(ai2dev, NMEA_MASK_ALL);
if (ret)
goto err;
- msleep(50);
ret = ai2_set_receiver_state(ai2dev, RECEIVER_STATE_ON);
if (ret)
goto err;
@@ -253,13 +284,9 @@ static void gnss_ai2_close(struct gnss_device *gdev)
{
struct ai2_device *ai2dev = gnss_get_drvdata(gdev);
- /* TODO: find out on what kind of ack we should wait */
if (!ai2raw) {
- msleep(50);
ai2_set_receiver_state(ai2dev, RECEIVER_STATE_IDLE);
- msleep(50);
ai2_set_receiver_state(ai2dev, RECEIVER_STATE_OFF);
- msleep(200); /* seen some longer response time here, so wait */
}
mutex_lock(&ai2dev->gdev_mutex);
@@ -344,8 +371,10 @@ static void process_ai2_frame(struct ai2_device *ai2dev)
}
/* reached if byte 1 in the command packet is set to 1 */
- if (data[1] == AI2_ACK)
+ if (data[1] == AI2_ACK) {
+ complete(&ai2dev->ai2_ack_complete);
return;
+ }
head = skb_pull(ai2dev->recv_skb, 2); /* drop frame start marker */
while (head && (ai2dev->recv_skb->len >= 3)) {
@@ -433,11 +462,9 @@ static void gnss_recv_frame(struct device *dev, struct sk_buff *skb)
gnss_hdr = (struct gps_event_hdr *)skb->data;
data = skb_pull(skb, sizeof(*gnss_hdr));
- /*
- * REVISIT: maybe do something with the completed
- * event
- */
- if (gnss_hdr->opcode == GPS_CH9_OP_READ) {
+
+ switch (gnss_hdr->opcode) {
+ case GPS_CH9_OP_READ:
mutex_lock(&ai2dev->gdev_mutex);
if (ai2dev->gdev_open) {
if (ai2raw)
@@ -449,6 +476,10 @@ static void gnss_recv_frame(struct device *dev, struct sk_buff *skb)
"receiving data while chip should be off\n");
}
mutex_unlock(&ai2dev->gdev_mutex);
+ break;
+ case GPS_CH9_OP_COMPLETED_EVT:
+ complete(&ai2dev->ch9_complete);
+ break;
}
kfree_skb(skb);
}
@@ -474,6 +505,8 @@ static int gnss_ai2_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, ai2dev);
st_set_gnss_recv_func(pdev->dev.parent, gnss_recv_frame);
mutex_init(&ai2dev->gdev_mutex);
+ init_completion(&ai2dev->ch9_complete);
+ init_completion(&ai2dev->ai2_ack_complete);
ret = gnss_register_device(gdev);
if (ret)
--
2.39.2
This is automated email and please do not reply to this email!
Dear submitter,
Thank you for submitting the patches to the linux bluetooth mailing list.
This is a CI test results with your patch series:
PW Link:https://patchwork.kernel.org/project/bluetooth/list/?series=858321
---Test result---
Test Summary:
CheckPatch FAIL 4.08 seconds
GitLint FAIL 1.54 seconds
SubjectPrefix FAIL 0.72 seconds
BuildKernel PASS 29.90 seconds
CheckAllWarning PASS 32.84 seconds
CheckSparse PASS 38.35 seconds
CheckSmatch FAIL 34.96 seconds
BuildKernel32 PASS 28.90 seconds
TestRunnerSetup PASS 523.03 seconds
TestRunner_l2cap-tester PASS 18.24 seconds
TestRunner_iso-tester PASS 30.81 seconds
TestRunner_bnep-tester PASS 4.82 seconds
TestRunner_mgmt-tester PASS 111.23 seconds
TestRunner_rfcomm-tester PASS 7.39 seconds
TestRunner_sco-tester PASS 15.00 seconds
TestRunner_ioctl-tester PASS 9.49 seconds
TestRunner_mesh-tester PASS 5.95 seconds
TestRunner_smp-tester PASS 6.91 seconds
TestRunner_userchan-tester PASS 5.07 seconds
IncrementalBuild PASS 41.21 seconds
Details
##############################
Test: CheckPatch - FAIL
Desc: Run checkpatch.pl script
Output:
[v3,3/4] gnss: Add driver for AI2 protocol
WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#139:
new file mode 100644
total: 0 errors, 1 warnings, 550 lines checked
NOTE: For some of the reported defects, checkpatch may be able to
mechanically convert to the typical style using --fix or --fix-inplace.
/github/workspace/src/src/13683899.patch has style problems, please review.
NOTE: Ignored message types: UNKNOWN_COMMIT_ID
NOTE: If any of the errors are false positives, please report
them to the maintainer, see CHECKPATCH in MAINTAINERS.
##############################
Test: GitLint - FAIL
Desc: Run gitlint
Output:
[v3,1/4] gnss: Add AI2 protocol used by some TI combo chips.
WARNING: I3 - ignore-body-lines: gitlint will be switching from using Python regex 'match' (match beginning) to 'search' (match anywhere) semantics. Please review your ignore-body-lines.regex option accordingly. To remove this warning, set general.regex-style-search=True. More details: https://jorisroovers.github.io/gitlint/configuration/#regex-style-search
1: T3 Title has trailing punctuation (.): "[v3,1/4] gnss: Add AI2 protocol used by some TI combo chips."
##############################
Test: SubjectPrefix - FAIL
Desc: Check subject contains "Bluetooth" prefix
Output:
"Bluetooth: " prefix is not specified in the subject
"Bluetooth: " prefix is not specified in the subject
"Bluetooth: " prefix is not specified in the subject
##############################
Test: CheckSmatch - FAIL
Desc: Run smatch tool with source
Output:
Segmentation fault (core dumped)
make[4]: *** [scripts/Makefile.build:244: net/bluetooth/hci_core.o] Error 139
make[4]: *** Deleting file 'net/bluetooth/hci_core.o'
make[3]: *** [scripts/Makefile.build:485: net/bluetooth] Error 2
make[2]: *** [scripts/Makefile.build:485: net] Error 2
make[2]: *** Waiting for unfinished jobs....
Segmentation fault (core dumped)
make[4]: *** [scripts/Makefile.build:244: drivers/bluetooth/bcm203x.o] Error 139
make[4]: *** Deleting file 'drivers/bluetooth/bcm203x.o'
make[4]: *** Waiting for unfinished jobs....
make[3]: *** [scripts/Makefile.build:485: drivers/bluetooth] Error 2
make[2]: *** [scripts/Makefile.build:485: drivers] Error 2
make[1]: *** [/github/workspace/src/src/Makefile:1919: .] Error 2
make: *** [Makefile:240: __sub-make] Error 2
---
Regards,
Linux Bluetooth
Hi Andreas,
kernel test robot noticed the following build errors:
[auto build test ERROR on bluetooth/master]
[also build test ERROR on bluetooth-next/master char-misc/char-misc-testing char-misc/char-misc-next char-misc/char-misc-linus linus/master v6.10-rc2 next-20240603]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Andreas-Kemnade/gnss-Add-AI2-protocol-used-by-some-TI-combo-chips/20240603-224753
base: https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth.git master
patch link: https://lore.kernel.org/r/20240603144400.2195564-4-andreas%40kemnade.info
patch subject: [PATCH v3 3/4] gnss: Add driver for AI2 protocol
config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20240604/[email protected]/config)
compiler: alpha-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240604/[email protected]/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
All errors (new ones prefixed by >>):
drivers/gnss/ai2.c: In function 'process_ai2_frame':
>> drivers/gnss/ai2.c:340:13: error: implicit declaration of function 'get_unaligned_le16' [-Werror=implicit-function-declaration]
340 | if (get_unaligned_le16(data + i) != sum) {
| ^~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
vim +/get_unaligned_le16 +340 drivers/gnss/ai2.c
324
325 /* do some sanity checks and split frame into packets */
326 static void process_ai2_frame(struct ai2_device *ai2dev)
327 {
328 u16 sum;
329 int i;
330 u8 *head;
331 u8 *data;
332
333 sum = 0;
334 data = ai2dev->recv_skb->data;
335 for (i = 0; i < ai2dev->recv_skb->len - 2; i++)
336 sum += data[i];
337
338 print_hex_dump_bytes("ai2 frame: ", DUMP_PREFIX_OFFSET, data, ai2dev->recv_skb->len);
339
> 340 if (get_unaligned_le16(data + i) != sum) {
341 dev_dbg(ai2dev->dev,
342 "checksum error in reception, dropping frame\n");
343 return;
344 }
345
346 /* reached if byte 1 in the command packet is set to 1 */
347 if (data[1] == AI2_ACK)
348 return;
349
350 head = skb_pull(ai2dev->recv_skb, 2); /* drop frame start marker */
351 while (head && (ai2dev->recv_skb->len >= 3)) {
352 u8 cmd;
353 u16 pktlen;
354
355 cmd = head[0];
356 pktlen = get_unaligned_le16(head + 1);
357 data = skb_pull(ai2dev->recv_skb, 3);
358 if (!data)
359 break;
360
361 if (pktlen > ai2dev->recv_skb->len)
362 break;
363
364 head = skb_pull(ai2dev->recv_skb, pktlen);
365
366 process_ai2_packet(ai2dev, cmd, data, pktlen);
367 }
368 }
369
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Hi Andreas,
kernel test robot noticed the following build errors:
[auto build test ERROR on bluetooth/master]
[also build test ERROR on bluetooth-next/master char-misc/char-misc-testing char-misc/char-misc-next char-misc/char-misc-linus linus/master v6.10-rc2 next-20240604]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Andreas-Kemnade/gnss-Add-AI2-protocol-used-by-some-TI-combo-chips/20240603-224753
base: https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth.git master
patch link: https://lore.kernel.org/r/20240603144400.2195564-4-andreas%40kemnade.info
patch subject: [PATCH v3 3/4] gnss: Add driver for AI2 protocol
config: hexagon-allyesconfig (https://download.01.org/0day-ci/archive/20240604/[email protected]/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project d7d2d4f53fc79b4b58e8d8d08151b577c3699d4a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240604/[email protected]/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
All errors (new ones prefixed by >>):
In file included from drivers/gnss/ai2.c:9:
In file included from include/linux/gnss.h:13:
In file included from include/linux/kfifo.h:42:
In file included from include/linux/scatterlist.h:8:
In file included from include/linux/mm.h:2210:
include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
522 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
| ~~~~~~~~~~~ ^ ~~~
In file included from drivers/gnss/ai2.c:9:
In file included from include/linux/gnss.h:13:
In file included from include/linux/kfifo.h:42:
In file included from include/linux/scatterlist.h:9:
In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
547 | val = __raw_readb(PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
560 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
| ^
In file included from drivers/gnss/ai2.c:9:
In file included from include/linux/gnss.h:13:
In file included from include/linux/kfifo.h:42:
In file included from include/linux/scatterlist.h:9:
In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
573 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
| ^
In file included from drivers/gnss/ai2.c:9:
In file included from include/linux/gnss.h:13:
In file included from include/linux/kfifo.h:42:
In file included from include/linux/scatterlist.h:9:
In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
584 | __raw_writeb(value, PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
594 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
604 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
>> drivers/gnss/ai2.c:340:6: error: call to undeclared function 'get_unaligned_le16'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
340 | if (get_unaligned_le16(data + i) != sum) {
| ^
7 warnings and 1 error generated.
vim +/get_unaligned_le16 +340 drivers/gnss/ai2.c
324
325 /* do some sanity checks and split frame into packets */
326 static void process_ai2_frame(struct ai2_device *ai2dev)
327 {
328 u16 sum;
329 int i;
330 u8 *head;
331 u8 *data;
332
333 sum = 0;
334 data = ai2dev->recv_skb->data;
335 for (i = 0; i < ai2dev->recv_skb->len - 2; i++)
336 sum += data[i];
337
338 print_hex_dump_bytes("ai2 frame: ", DUMP_PREFIX_OFFSET, data, ai2dev->recv_skb->len);
339
> 340 if (get_unaligned_le16(data + i) != sum) {
341 dev_dbg(ai2dev->dev,
342 "checksum error in reception, dropping frame\n");
343 return;
344 }
345
346 /* reached if byte 1 in the command packet is set to 1 */
347 if (data[1] == AI2_ACK)
348 return;
349
350 head = skb_pull(ai2dev->recv_skb, 2); /* drop frame start marker */
351 while (head && (ai2dev->recv_skb->len >= 3)) {
352 u8 cmd;
353 u16 pktlen;
354
355 cmd = head[0];
356 pktlen = get_unaligned_le16(head + 1);
357 data = skb_pull(ai2dev->recv_skb, 3);
358 if (!data)
359 break;
360
361 if (pktlen > ai2dev->recv_skb->len)
362 break;
363
364 head = skb_pull(ai2dev->recv_skb, pktlen);
365
366 process_ai2_packet(ai2dev, cmd, data, pktlen);
367 }
368 }
369
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