// SPDX-License-Identifier: GPL-2.0
-/* Copyright (C) 2018-2021, Intel Corporation. */
+/* Copyright (C) 2021-2022, Intel Corporation. */
#include "ice.h"
#include "ice_lib.h"
#include <linux/tty_driver.h>
+/**
+ * ice_gnss_do_write - Write data to internal GNSS
+ * @pf: board private structure
+ * @buf: command buffer
+ * @size: command buffer size
+ *
+ * Write UBX command data to the GNSS receiver
+ */
+static unsigned int
+ice_gnss_do_write(struct ice_pf *pf, unsigned char *buf, unsigned int size)
+{
+ struct ice_aqc_link_topo_addr link_topo;
+ struct ice_hw *hw = &pf->hw;
+ unsigned int offset = 0;
+ int err = 0;
+
+ memset(&link_topo, 0, sizeof(struct ice_aqc_link_topo_addr));
+ link_topo.topo_params.index = ICE_E810T_GNSS_I2C_BUS;
+ link_topo.topo_params.node_type_ctx |=
+ FIELD_PREP(ICE_AQC_LINK_TOPO_NODE_CTX_M,
+ ICE_AQC_LINK_TOPO_NODE_CTX_OVERRIDE);
+
+ /* It's not possible to write a single byte to u-blox.
+ * Write all bytes in a loop until there are 6 or less bytes left. If
+ * there are exactly 6 bytes left, the last write would be only a byte.
+ * In this case, do 4+2 bytes writes instead of 5+1. Otherwise, do the
+ * last 2 to 5 bytes write.
+ */
+ while (size - offset > ICE_GNSS_UBX_WRITE_BYTES + 1) {
+ err = ice_aq_write_i2c(hw, link_topo, ICE_GNSS_UBX_I2C_BUS_ADDR,
+ cpu_to_le16(buf[offset]),
+ ICE_MAX_I2C_WRITE_BYTES,
+ &buf[offset + 1], NULL);
+ if (err)
+ goto err_out;
+
+ offset += ICE_GNSS_UBX_WRITE_BYTES;
+ }
+
+ /* Single byte would be written. Write 4 bytes instead of 5. */
+ if (size - offset == ICE_GNSS_UBX_WRITE_BYTES + 1) {
+ err = ice_aq_write_i2c(hw, link_topo, ICE_GNSS_UBX_I2C_BUS_ADDR,
+ cpu_to_le16(buf[offset]),
+ ICE_MAX_I2C_WRITE_BYTES - 1,
+ &buf[offset + 1], NULL);
+ if (err)
+ goto err_out;
+
+ offset += ICE_GNSS_UBX_WRITE_BYTES - 1;
+ }
+
+ /* Do the last write, 2 to 5 bytes. */
+ err = ice_aq_write_i2c(hw, link_topo, ICE_GNSS_UBX_I2C_BUS_ADDR,
+ cpu_to_le16(buf[offset]), size - offset - 1,
+ &buf[offset + 1], NULL);
+ if (err)
+ goto err_out;
+
+ return size;
+
+err_out:
+ dev_err(ice_pf_to_dev(pf), "GNSS failed to write, offset=%u, size=%u, err=%d\n",
+ offset, size, err);
+
+ return offset;
+}
+
+/**
+ * ice_gnss_write_pending - Write all pending data to internal GNSS
+ * @work: GNSS write work structure
+ */
+static void ice_gnss_write_pending(struct kthread_work *work)
+{
+ struct gnss_serial *gnss = container_of(work, struct gnss_serial,
+ write_work);
+ struct ice_pf *pf = gnss->back;
+
+ if (!list_empty(&gnss->queue)) {
+ struct gnss_write_buf *write_buf = NULL;
+ unsigned int bytes;
+
+ write_buf = list_first_entry(&gnss->queue,
+ struct gnss_write_buf, queue);
+
+ bytes = ice_gnss_do_write(pf, write_buf->buf, write_buf->size);
+ dev_dbg(ice_pf_to_dev(pf), "%u bytes written to GNSS\n", bytes);
+
+ list_del(&write_buf->queue);
+ kfree(write_buf->buf);
+ kfree(write_buf);
+ }
+}
+
/**
* ice_gnss_read - Read data from internal GNSS module
* @work: GNSS read work structure
/**
* ice_gnss_struct_init - Initialize GNSS structure for the TTY
* @pf: Board private structure
+ * @index: TTY device index
*/
-static struct gnss_serial *ice_gnss_struct_init(struct ice_pf *pf)
+static struct gnss_serial *ice_gnss_struct_init(struct ice_pf *pf, int index)
{
struct device *dev = ice_pf_to_dev(pf);
struct kthread_worker *kworker;
mutex_init(&gnss->gnss_mutex);
gnss->open_count = 0;
gnss->back = pf;
- pf->gnss_serial = gnss;
+ pf->gnss_serial[index] = 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.
*/
tty->driver_data = NULL;
/* Get the serial object associated with this tty pointer */
- gnss = pf->gnss_serial;
+ gnss = pf->gnss_serial[tty->index];
if (!gnss) {
/* Initialize GNSS struct on the first device open */
- gnss = ice_gnss_struct_init(pf);
+ gnss = ice_gnss_struct_init(pf, tty->index);
if (!gnss)
return -ENOMEM;
}
}
/**
- * ice_gnss_tty_write - Dummy TTY write function to avoid kernel panic
+ * ice_gnss_tty_write - Write GNSS data
* @tty: pointer to the tty_struct
* @buf: pointer to the user data
- * @cnt: the number of characters that was able to be sent to the hardware (or
- * queued to be sent at a later time)
+ * @count: the number of characters queued to be sent to the HW
+ *
+ * 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.
*/
static int
-ice_gnss_tty_write(struct tty_struct *tty, const unsigned char *buf, int cnt)
+ice_gnss_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
- return 0;
+ 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 (!gnss->open_count) {
+ err = -EINVAL;
+ goto exit;
+ }
+
+ cmd_buf = kcalloc(count, sizeof(*buf), GFP_KERNEL);
+ if (!cmd_buf) {
+ err = -ENOMEM;
+ goto exit;
+ }
+
+ memcpy(cmd_buf, buf, count);
+
+ /* Send the data out to a hardware port */
+ write_buf = kzalloc(sizeof(*write_buf), GFP_KERNEL);
+ if (!write_buf) {
+ err = -ENOMEM;
+ goto exit;
+ }
+
+ write_buf->buf = cmd_buf;
+ write_buf->size = 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;
}
/**
- * ice_gnss_tty_write_room - Dummy TTY write_room function to avoid kernel panic
+ * ice_gnss_tty_write_room - Returns the numbers of characters to be written.
* @tty: pointer to the tty_struct
+ *
+ * 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.
*/
static unsigned int ice_gnss_tty_write_room(struct tty_struct *tty)
{
- return 0;
+ 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);
+
+ if (!gnss->open_count) {
+ mutex_unlock(&gnss->gnss_mutex);
+ return 0;
+ }
+
+ mutex_unlock(&gnss->gnss_mutex);
+ return ICE_GNSS_TTY_WRITE_BUF;
}
static const struct tty_operations tty_gps_ops = {
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(1, TTY_DRIVER_REAL_RAW);
+ tty_driver = tty_alloc_driver(ICE_GNSS_TTY_MINOR_DEVICES,
+ TTY_DRIVER_REAL_RAW);
if (IS_ERR(tty_driver)) {
- dev_err(ice_pf_to_dev(pf), "Failed to allocate memory for GNSS TTY\n");
+ dev_err(dev, "Failed to allocate memory for GNSS TTY\n");
return NULL;
}
tty_driver->driver_state = pf;
tty_set_operations(tty_driver, &tty_gps_ops);
- pf->gnss_serial = NULL;
+ for (i = 0; i < ICE_GNSS_TTY_MINOR_DEVICES; i++) {
+ pf->gnss_tty_port[i] = kzalloc(sizeof(*pf->gnss_tty_port[i]),
+ GFP_KERNEL);
+ pf->gnss_serial[i] = NULL;
- tty_port_init(&pf->gnss_tty_port);
- tty_port_link_device(&pf->gnss_tty_port, tty_driver, 0);
+ 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(ice_pf_to_dev(pf), "Failed to register TTY driver err=%d\n",
- err);
+ dev_err(dev, "Failed to register TTY driver err=%d\n", err);
- tty_port_destroy(&pf->gnss_tty_port);
+ for (i = 0; i < ICE_GNSS_TTY_MINOR_DEVICES; 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;
}
+ for (i = 0; i < ICE_GNSS_TTY_MINOR_DEVICES; i++)
+ dev_info(dev, "%s%d registered\n", ttydrv_name, i);
+
return tty_driver;
}
*/
void ice_gnss_exit(struct ice_pf *pf)
{
+ unsigned int i;
+
if (!test_bit(ICE_FLAG_GNSS, pf->flags) || !pf->ice_gnss_tty_driver)
return;
- tty_port_destroy(&pf->gnss_tty_port);
+ 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_delayed_work_sync(&gnss->read_work);
- kfree(gnss);
- pf->gnss_serial = NULL;
+ kthread_cancel_work_sync(&gnss->write_work);
+ kthread_cancel_delayed_work_sync(&gnss->read_work);
+ kfree(gnss);
+ pf->gnss_serial[i] = NULL;
+ }
}
tty_unregister_driver(pf->ice_gnss_tty_driver);
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