1 files changed, 140 insertions, 237 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_gnss.c b/drivers/net/ethernet/intel/ice/ice_gnss.c
index 43e199b5b513..8dec748bb53a 100644
--- a/drivers/net/ethernet/intel/ice/ice_gnss.c
+++ b/drivers/net/ethernet/intel/ice/ice_gnss.c
@@ -3,15 +3,18 @@
 
 #include "ice.h"
 #include "ice_lib.h"
-#include <linux/tty_driver.h>
 
 /**
- * ice_gnss_do_write - Write data to internal GNSS
+ * ice_gnss_do_write - Write data to internal GNSS receiver
  * @pf: board private structure
  * @buf: command buffer
  * @size: command buffer size
  *
  * Write UBX command data to the GNSS receiver
+ *
+ * Return:
+ * * number of bytes written - success
+ * * negative - error code
  */
 static unsigned int
 ice_gnss_do_write(struct ice_pf *pf, unsigned char *buf, unsigned int size)
@@ -82,6 +85,12 @@ static void ice_gnss_write_pending(struct kthread_work *work)
 						write_work);
 	struct ice_pf *pf = gnss->back;
 
+	if (!pf)
+		return;
+
+	if (!test_bit(ICE_FLAG_GNSS, pf->flags))
+		return;
+
 	if (!list_empty(&gnss->queue)) {
 		struct gnss_write_buf *write_buf = NULL;
 		unsigned int bytes;
@@ -102,16 +111,14 @@ static void ice_gnss_write_pending(struct kthread_work *work)
  * ice_gnss_read - Read data from internal GNSS module
  * @work: GNSS read work structure
  *
- * Read the data from internal GNSS receiver, number of bytes read will be
- * returned in *read_data parameter.
+ * Read the data from internal GNSS receiver, write it to gnss_dev.
  */
 static void ice_gnss_read(struct kthread_work *work)
 {
 	struct gnss_serial *gnss = container_of(work, struct gnss_serial,
 						read_work.work);
+	unsigned int i, bytes_read, data_len, count;
 	struct ice_aqc_link_topo_addr link_topo;
-	unsigned int i, bytes_read, data_len;
-	struct tty_port *port;
 	struct ice_pf *pf;
 	struct ice_hw *hw;
 	__be16 data_len_b;
@@ -120,14 +127,15 @@ static void ice_gnss_read(struct kthread_work *work)
 	int err = 0;
 
 	pf = gnss->back;
-	if (!pf || !gnss->tty || !gnss->tty->port) {
+	if (!pf) {
 		err = -EFAULT;
 		goto exit;
 	}
 
-	hw = &pf->hw;
-	port = gnss->tty->port;
+	if (!test_bit(ICE_FLAG_GNSS, pf->flags))
+		return;
 
+	hw = &pf->hw;
 	buf = (char *)get_zeroed_page(GFP_KERNEL);
 	if (!buf) {
 		err = -ENOMEM;
@@ -159,7 +167,6 @@ static void ice_gnss_read(struct kthread_work *work)
 	}
 
 	data_len = min_t(typeof(data_len), data_len, PAGE_SIZE);
-	data_len = tty_buffer_request_room(port, data_len);
 	if (!data_len) {
 		err = -ENOMEM;
 		goto exit_buf;
@@ -179,12 +186,11 @@ static void ice_gnss_read(struct kthread_work *work)
 			goto exit_buf;
 	}
 
-	/* Send the data to the tty layer for users to read. This doesn't
-	 * actually push the data through unless tty->low_latency is set.
-	 */
-	tty_insert_flip_string(port, buf, i);
-	tty_flip_buffer_push(port);
-
+	count = gnss_insert_raw(pf->gnss_dev, buf, i);
+	if (count != i)
+		dev_warn(ice_pf_to_dev(pf),
+			 "gnss_insert_raw ret=%d size=%d\n",
+			 count, i);
 exit_buf:
 	free_page((unsigned long)buf);
 	kthread_queue_delayed_work(gnss->kworker, &gnss->read_work,
@@ -195,11 +201,16 @@ exit:
 }
 
 /**
- * ice_gnss_struct_init - Initialize GNSS structure for the TTY
+ * ice_gnss_struct_init - Initialize GNSS receiver
  * @pf: Board private structure
- * @index: TTY device index
+ *
+ * Initialize GNSS structures and workers.
+ *
+ * Return:
+ * * pointer to initialized gnss_serial struct - success
+ * * NULL - error
  */
-static struct gnss_serial *ice_gnss_struct_init(struct ice_pf *pf, int index)
+static struct gnss_serial *ice_gnss_struct_init(struct ice_pf *pf)
 {
 	struct device *dev = ice_pf_to_dev(pf);
 	struct kthread_worker *kworker;
@@ -209,17 +220,12 @@ static struct gnss_serial *ice_gnss_struct_init(struct ice_pf *pf, int index)
 	if (!gnss)
 		return NULL;
 
-	mutex_init(&gnss->gnss_mutex);
-	gnss->open_count = 0;
 	gnss->back = pf;
-	pf->gnss_serial[index] = gnss;
+	pf->gnss_serial = gnss;
 
 	kthread_init_delayed_work(&gnss->read_work, ice_gnss_read);
 	INIT_LIST_HEAD(&gnss->queue);
 	kthread_init_work(&gnss->write_work, ice_gnss_write_pending);
-	/* Allocate a kworker for handling work required for the GNSS TTY
-	 * writes.
-	 */
 	kworker = kthread_create_worker(0, "ice-gnss-%s", dev_name(dev));
 	if (IS_ERR(kworker)) {
 		kfree(gnss);
@@ -232,140 +238,100 @@ static struct gnss_serial *ice_gnss_struct_init(struct ice_pf *pf, int index)
 }
 
 /**
- * ice_gnss_tty_open - Initialize GNSS structures on TTY device open
- * @tty: pointer to the tty_struct
- * @filp: pointer to the file
+ * ice_gnss_open - Open GNSS device
+ * @gdev: pointer to the gnss device struct
+ *
+ * Open GNSS device and start filling the read buffer for consumer.
  *
- * This routine is mandatory. If this routine is not filled in, the attempted
- * open will fail with ENODEV.
+ * Return:
+ * * 0 - success
+ * * negative - error code
  */
-static int ice_gnss_tty_open(struct tty_struct *tty, struct file *filp)
+static int ice_gnss_open(struct gnss_device *gdev)
 {
+	struct ice_pf *pf = gnss_get_drvdata(gdev);
 	struct gnss_serial *gnss;
-	struct ice_pf *pf;
 
-	pf = (struct ice_pf *)tty->driver->driver_state;
 	if (!pf)
 		return -EFAULT;
 
-	/* Clear the pointer in case something fails */
-	tty->driver_data = NULL;
-
-	/* Get the serial object associated with this tty pointer */
-	gnss = pf->gnss_serial[tty->index];
-	if (!gnss) {
-		/* Initialize GNSS struct on the first device open */
-		gnss = ice_gnss_struct_init(pf, tty->index);
-		if (!gnss)
-			return -ENOMEM;
-	}
+	if (!test_bit(ICE_FLAG_GNSS, pf->flags))
+		return -EFAULT;
 
-	mutex_lock(&gnss->gnss_mutex);
+	gnss = pf->gnss_serial;
+	if (!gnss)
+		return -ENODEV;
 
-	/* Save our structure within the tty structure */
-	tty->driver_data = gnss;
-	gnss->tty = tty;
-	gnss->open_count++;
 	kthread_queue_delayed_work(gnss->kworker, &gnss->read_work, 0);
 
-	mutex_unlock(&gnss->gnss_mutex);
-
 	return 0;
 }
 
 /**
- * ice_gnss_tty_close - Cleanup GNSS structures on tty device close
- * @tty: pointer to the tty_struct
- * @filp: pointer to the file
+ * ice_gnss_close - Close GNSS device
+ * @gdev: pointer to the gnss device struct
+ *
+ * Close GNSS device, cancel worker, stop filling the read buffer.
  */
-static void ice_gnss_tty_close(struct tty_struct *tty, struct file *filp)
+static void ice_gnss_close(struct gnss_device *gdev)
 {
-	struct gnss_serial *gnss = tty->driver_data;
-	struct ice_pf *pf;
-
-	if (!gnss)
-		return;
+	struct ice_pf *pf = gnss_get_drvdata(gdev);
+	struct gnss_serial *gnss;
 
-	pf = (struct ice_pf *)tty->driver->driver_state;
 	if (!pf)
 		return;
 
-	mutex_lock(&gnss->gnss_mutex);
-
-	if (!gnss->open_count) {
-		/* Port was never opened */
-		dev_err(ice_pf_to_dev(pf), "GNSS port not opened\n");
-		goto exit;
-	}
+	gnss = pf->gnss_serial;
+	if (!gnss)
+		return;
 
-	gnss->open_count--;
-	if (gnss->open_count <= 0) {
-		/* Port is in shutdown state */
-		kthread_cancel_delayed_work_sync(&gnss->read_work);
-	}
-exit:
-	mutex_unlock(&gnss->gnss_mutex);
+	kthread_cancel_work_sync(&gnss->write_work);
+	kthread_cancel_delayed_work_sync(&gnss->read_work);
 }
 
 /**
- * ice_gnss_tty_write - Write GNSS data
- * @tty: pointer to the tty_struct
+ * ice_gnss_write - Write to GNSS device
+ * @gdev: pointer to the gnss device struct
  * @buf: pointer to the user data
- * @count: the number of characters queued to be sent to the HW
+ * @count: size of the buffer to be sent to the GNSS device
  *
- * The write function call is called by the user when there is data to be sent
- * to the hardware. First the tty core receives the call, and then it passes the
- * data on to the tty driver's write function. The tty core also tells the tty
- * driver the size of the data being sent.
- * If any errors happen during the write call, a negative error value should be
- * returned instead of the number of characters queued to be written.
+ * Return:
+ * * number of written bytes - success
+ * * negative - error code
  */
 static int
-ice_gnss_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
+ice_gnss_write(struct gnss_device *gdev, const unsigned char *buf,
+	       size_t count)
 {
+	struct ice_pf *pf = gnss_get_drvdata(gdev);
 	struct gnss_write_buf *write_buf;
 	struct gnss_serial *gnss;
 	unsigned char *cmd_buf;
-	struct ice_pf *pf;
 	int err = count;
 
 	/* We cannot write a single byte using our I2C implementation. */
 	if (count <= 1 || count > ICE_GNSS_TTY_WRITE_BUF)
 		return -EINVAL;
 
-	gnss = tty->driver_data;
-	if (!gnss)
-		return -EFAULT;
-
-	pf = (struct ice_pf *)tty->driver->driver_state;
 	if (!pf)
 		return -EFAULT;
 
-	/* Only allow to write on TTY 0 */
-	if (gnss != pf->gnss_serial[0])
-		return -EIO;
-
-	mutex_lock(&gnss->gnss_mutex);
+	if (!test_bit(ICE_FLAG_GNSS, pf->flags))
+		return -EFAULT;
 
-	if (!gnss->open_count) {
-		err = -EINVAL;
-		goto exit;
-	}
+	gnss = pf->gnss_serial;
+	if (!gnss)
+		return -ENODEV;
 
 	cmd_buf = kcalloc(count, sizeof(*buf), GFP_KERNEL);
-	if (!cmd_buf) {
-		err = -ENOMEM;
-		goto exit;
-	}
+	if (!cmd_buf)
+		return -ENOMEM;
 
 	memcpy(cmd_buf, buf, count);
-
-	/* Send the data out to a hardware port */
 	write_buf = kzalloc(sizeof(*write_buf), GFP_KERNEL);
 	if (!write_buf) {
 		kfree(cmd_buf);
-		err = -ENOMEM;
-		goto exit;
+		return -ENOMEM;
 	}
 
 	write_buf->buf = cmd_buf;
@@ -373,141 +339,89 @@ ice_gnss_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
 	INIT_LIST_HEAD(&write_buf->queue);
 	list_add_tail(&write_buf->queue, &gnss->queue);
 	kthread_queue_work(gnss->kworker, &gnss->write_work);
-exit:
-	mutex_unlock(&gnss->gnss_mutex);
+
 	return err;
 }
 
+static const struct gnss_operations ice_gnss_ops = {
+	.open = ice_gnss_open,
+	.close = ice_gnss_close,
+	.write_raw = ice_gnss_write,
+};
+
 /**
- * ice_gnss_tty_write_room - Returns the numbers of characters to be written.
- * @tty: pointer to the tty_struct
+ * ice_gnss_register - Register GNSS receiver
+ * @pf: Board private structure
+ *
+ * Allocate and register GNSS receiver in the Linux GNSS subsystem.
  *
- * This routine returns the numbers of characters the tty driver will accept
- * for queuing to be written or 0 if either the TTY is not open or user
- * tries to write to the TTY other than the first.
+ * Return:
+ * * 0 - success
+ * * negative - error code
  */
-static unsigned int ice_gnss_tty_write_room(struct tty_struct *tty)
+static int ice_gnss_register(struct ice_pf *pf)
 {
-	struct gnss_serial *gnss = tty->driver_data;
-
-	/* Only allow to write on TTY 0 */
-	if (!gnss || gnss != gnss->back->gnss_serial[0])
-		return 0;
-
-	mutex_lock(&gnss->gnss_mutex);
+	struct gnss_device *gdev;
+	int ret;
+
+	gdev = gnss_allocate_device(ice_pf_to_dev(pf));
+	if (!gdev) {
+		dev_err(ice_pf_to_dev(pf),
+			"gnss_allocate_device returns NULL\n");
+		return -ENOMEM;
+	}
 
-	if (!gnss->open_count) {
-		mutex_unlock(&gnss->gnss_mutex);
-		return 0;
+	gdev->ops = &ice_gnss_ops;
+	gdev->type = GNSS_TYPE_UBX;
+	gnss_set_drvdata(gdev, pf);
+	ret = gnss_register_device(gdev);
+	if (ret) {
+		dev_err(ice_pf_to_dev(pf), "gnss_register_device err=%d\n",
+			ret);
+		gnss_put_device(gdev);
+	} else {
+		pf->gnss_dev = gdev;
 	}
 
-	mutex_unlock(&gnss->gnss_mutex);
-	return ICE_GNSS_TTY_WRITE_BUF;
+	return ret;
 }
 
-static const struct tty_operations tty_gps_ops = {
-	.open =		ice_gnss_tty_open,
-	.close =	ice_gnss_tty_close,
-	.write =	ice_gnss_tty_write,
-	.write_room =	ice_gnss_tty_write_room,
-};
-
 /**
- * ice_gnss_create_tty_driver - Create a TTY driver for GNSS
+ * ice_gnss_deregister - Deregister GNSS receiver
  * @pf: Board private structure
+ *
+ * Deregister GNSS receiver from the Linux GNSS subsystem,
+ * release its resources.
  */
-static struct tty_driver *ice_gnss_create_tty_driver(struct ice_pf *pf)
+static void ice_gnss_deregister(struct ice_pf *pf)
 {
-	struct device *dev = ice_pf_to_dev(pf);
-	const int ICE_TTYDRV_NAME_MAX = 14;
-	struct tty_driver *tty_driver;
-	char *ttydrv_name;
-	unsigned int i;
-	int err;
-
-	tty_driver = tty_alloc_driver(ICE_GNSS_TTY_MINOR_DEVICES,
-				      TTY_DRIVER_REAL_RAW);
-	if (IS_ERR(tty_driver)) {
-		dev_err(dev, "Failed to allocate memory for GNSS TTY\n");
-		return NULL;
-	}
-
-	ttydrv_name = kzalloc(ICE_TTYDRV_NAME_MAX, GFP_KERNEL);
-	if (!ttydrv_name) {
-		tty_driver_kref_put(tty_driver);
-		return NULL;
+	if (pf->gnss_dev) {
+		gnss_deregister_device(pf->gnss_dev);
+		gnss_put_device(pf->gnss_dev);
+		pf->gnss_dev = NULL;
 	}
-
-	snprintf(ttydrv_name, ICE_TTYDRV_NAME_MAX, "ttyGNSS_%02x%02x_",
-		 (u8)pf->pdev->bus->number, (u8)PCI_SLOT(pf->pdev->devfn));
-
-	/* Initialize the tty driver*/
-	tty_driver->owner = THIS_MODULE;
-	tty_driver->driver_name = dev_driver_string(dev);
-	tty_driver->name = (const char *)ttydrv_name;
-	tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
-	tty_driver->subtype = SERIAL_TYPE_NORMAL;
-	tty_driver->init_termios = tty_std_termios;
-	tty_driver->init_termios.c_iflag &= ~INLCR;
-	tty_driver->init_termios.c_iflag |= IGNCR;
-	tty_driver->init_termios.c_oflag &= ~OPOST;
-	tty_driver->init_termios.c_lflag &= ~ICANON;
-	tty_driver->init_termios.c_cflag &= ~(CSIZE | CBAUD | CBAUDEX);
-	/* baud rate 9600 */
-	tty_termios_encode_baud_rate(&tty_driver->init_termios, 9600, 9600);
-	tty_driver->driver_state = pf;
-	tty_set_operations(tty_driver, &tty_gps_ops);
-
-	for (i = 0; i < ICE_GNSS_TTY_MINOR_DEVICES; i++) {
-		pf->gnss_tty_port[i] = kzalloc(sizeof(*pf->gnss_tty_port[i]),
-					       GFP_KERNEL);
-		if (!pf->gnss_tty_port[i])
-			goto err_out;
-
-		pf->gnss_serial[i] = NULL;
-
-		tty_port_init(pf->gnss_tty_port[i]);
-		tty_port_link_device(pf->gnss_tty_port[i], tty_driver, i);
-	}
-
-	err = tty_register_driver(tty_driver);
-	if (err) {
-		dev_err(dev, "Failed to register TTY driver err=%d\n", err);
-		goto err_out;
-	}
-
-	for (i = 0; i < ICE_GNSS_TTY_MINOR_DEVICES; i++)
-		dev_info(dev, "%s%d registered\n", ttydrv_name, i);
-
-	return tty_driver;
-
-err_out:
-	while (i--) {
-		tty_port_destroy(pf->gnss_tty_port[i]);
-		kfree(pf->gnss_tty_port[i]);
-	}
-	kfree(ttydrv_name);
-	tty_driver_kref_put(pf->ice_gnss_tty_driver);
-
-	return NULL;
 }
 
 /**
- * ice_gnss_init - Initialize GNSS TTY support
+ * ice_gnss_init - Initialize GNSS support
  * @pf: Board private structure
  */
 void ice_gnss_init(struct ice_pf *pf)
 {
-	struct tty_driver *tty_driver;
+	int ret;
 
-	tty_driver = ice_gnss_create_tty_driver(pf);
-	if (!tty_driver)
+	pf->gnss_serial = ice_gnss_struct_init(pf);
+	if (!pf->gnss_serial)
 		return;
 
-	pf->ice_gnss_tty_driver = tty_driver;
-
-	set_bit(ICE_FLAG_GNSS, pf->flags);
-	dev_info(ice_pf_to_dev(pf), "GNSS TTY init successful\n");
+	ret = ice_gnss_register(pf);
+	if (!ret) {
+		set_bit(ICE_FLAG_GNSS, pf->flags);
+		dev_info(ice_pf_to_dev(pf), "GNSS init successful\n");
+	} else {
+		ice_gnss_exit(pf);
+		dev_err(ice_pf_to_dev(pf), "GNSS init failure\n");
+	}
 }
 
 /**
@@ -516,31 +430,20 @@ void ice_gnss_init(struct ice_pf *pf)
  */
 void ice_gnss_exit(struct ice_pf *pf)
 {
-	unsigned int i;
+	ice_gnss_deregister(pf);
+	clear_bit(ICE_FLAG_GNSS, pf->flags);
 
-	if (!test_bit(ICE_FLAG_GNSS, pf->flags) || !pf->ice_gnss_tty_driver)
-		return;
-
-	for (i = 0; i < ICE_GNSS_TTY_MINOR_DEVICES; i++) {
-		if (pf->gnss_tty_port[i]) {
-			tty_port_destroy(pf->gnss_tty_port[i]);
-			kfree(pf->gnss_tty_port[i]);
-		}
+	if (pf->gnss_serial) {
+		struct gnss_serial *gnss = pf->gnss_serial;
 
-		if (pf->gnss_serial[i]) {
-			struct gnss_serial *gnss = pf->gnss_serial[i];
+		kthread_cancel_work_sync(&gnss->write_work);
+		kthread_cancel_delayed_work_sync(&gnss->read_work);
+		kthread_destroy_worker(gnss->kworker);
+		gnss->kworker = NULL;
 
-			kthread_cancel_work_sync(&gnss->write_work);
-			kthread_cancel_delayed_work_sync(&gnss->read_work);
-			kfree(gnss);
-			pf->gnss_serial[i] = NULL;
-		}
+		kfree(gnss);
+		pf->gnss_serial = NULL;
 	}
-
-	tty_unregister_driver(pf->ice_gnss_tty_driver);
-	kfree(pf->ice_gnss_tty_driver->name);
-	tty_driver_kref_put(pf->ice_gnss_tty_driver);
-	pf->ice_gnss_tty_driver = NULL;
 }
 
 /**