On 10/25/19 1:23 AM, Heikki Krogerus wrote:
Replacing the old "cmd" and "sync" callbacks with an
implementation of struct ucsi_operations. The ACPI
notification (interrupt) handler will from now on read the
CCI (Command Status and Connector Change Indication)
register, and call ucsi_connector_change() function and/or
complete pending command completions based on it.
Signed-off-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
---
drivers/usb/typec/ucsi/ucsi_acpi.c | 93 ++++++++++++++++++++++++------
1 file changed, 74 insertions(+), 19 deletions(-)
diff --git a/drivers/usb/typec/ucsi/ucsi_acpi.c b/drivers/usb/typec/ucsi/ucsi_acpi.c
index a18112a83fae..88d2401e3e61 100644
--- a/drivers/usb/typec/ucsi/ucsi_acpi.c
+++ b/drivers/usb/typec/ucsi/ucsi_acpi.c
@@ -19,7 +19,9 @@
struct ucsi_acpi {
struct device *dev;
struct ucsi *ucsi;
- struct ucsi_ppm ppm;
+ void __iomem *base;
+ struct completion complete;
+ unsigned long flags;
guid_t guid;
};
@@ -39,27 +41,75 @@ static int ucsi_acpi_dsm(struct ucsi_acpi *ua, int func)
return 0;
}
-static int ucsi_acpi_cmd(struct ucsi_ppm *ppm, struct ucsi_control *ctrl)
+static int ucsi_acpi_read(struct ucsi *ucsi, unsigned int offset,
+ void *val, size_t val_len)
{
- struct ucsi_acpi *ua = container_of(ppm, struct ucsi_acpi, ppm);
+ struct ucsi_acpi *ua = ucsi_get_drvdata(ucsi);
+ int ret;
+
+ ret = ucsi_acpi_dsm(ua, UCSI_DSM_FUNC_READ);
+ if (ret)
+ return ret;
+
+ memcpy(val, (const void __force *)(ua->base + offset), val_len);
+
Would it be better to use memcpy_fromio() and memcpy_toio() if
ua->base indeed points to iomem ?
+ return 0;
+}
+
+static int ucsi_acpi_async_write(struct ucsi *ucsi, unsigned int offset,
+ const void *val, size_t val_len)
+{
+ struct ucsi_acpi *ua = ucsi_get_drvdata(ucsi);
- ppm->data->ctrl.raw_cmd = ctrl->raw_cmd;
+ memcpy((void __force *)(ua->base + offset), val, val_len);
return ucsi_acpi_dsm(ua, UCSI_DSM_FUNC_WRITE);
}
-static int ucsi_acpi_sync(struct ucsi_ppm *ppm)
+static int ucsi_acpi_sync_write(struct ucsi *ucsi, unsigned int offset,
+ const void *val, size_t val_len)
{
- struct ucsi_acpi *ua = container_of(ppm, struct ucsi_acpi, ppm);
+ struct ucsi_acpi *ua = ucsi_get_drvdata(ucsi);
+ int ret;
+
+ set_bit(COMMAND_PENDING, &ua->flags);
+
+ ret = ucsi_acpi_async_write(ucsi, offset, val, val_len);
+ if (ret)
+ goto out_clear_bit;
- return ucsi_acpi_dsm(ua, UCSI_DSM_FUNC_READ);
+ if (!wait_for_completion_timeout(&ua->complete, msecs_to_jiffies(5000)))
+ ret = -ETIMEDOUT;
+
+out_clear_bit:
+ clear_bit(COMMAND_PENDING, &ua->flags);
+
+ return ret;
}
+static const struct ucsi_operations ucsi_acpi_ops = {
+ .read = ucsi_acpi_read,
+ .sync_write = ucsi_acpi_sync_write,
+ .async_write = ucsi_acpi_async_write
+};
+
static void ucsi_acpi_notify(acpi_handle handle, u32 event, void *data)
{
struct ucsi_acpi *ua = data;
+ u32 cci;
+ int ret;
+
+ ret = ucsi_acpi_read(ua->ucsi, UCSI_CCI, &cci, sizeof(cci));
+ if (ret) {
+ dev_err(ua->dev, "failed to read CCI\n");
If I follow the call chain correctly, this would be from ucsi_acpi_dsm(),
which already logs an error message.
+ return;
+ }
- ucsi_notify(ua->ucsi);
+ if (test_bit(COMMAND_PENDING, &ua->flags) &&
+ cci & (UCSI_CCI_ACK_COMPLETE | UCSI_CCI_COMMAND_COMPLETE))
+ complete(&ua->complete);
+ else if (UCSI_CCI_CONNECTOR(cci))
+ ucsi_connector_change(ua->ucsi, UCSI_CCI_CONNECTOR(cci));
}
static int ucsi_acpi_probe(struct platform_device *pdev)
@@ -90,35 +140,39 @@ static int ucsi_acpi_probe(struct platform_device *pdev)
* it can not be requested here, and we can not use
* devm_ioremap_resource().
*/
- ua->ppm.data = devm_ioremap(&pdev->dev, res->start, resource_size(res));
- if (!ua->ppm.data)
+ ua->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+ if (!ua->base)
return -ENOMEM;
- if (!ua->ppm.data->version)
- return -ENODEV;
-
ret = guid_parse(UCSI_DSM_UUID, &ua->guid);
if (ret)
return ret;
- ua->ppm.cmd = ucsi_acpi_cmd;
- ua->ppm.sync = ucsi_acpi_sync;
+ init_completion(&ua->complete);
ua->dev = &pdev->dev;
+ ua->ucsi = ucsi_create(&pdev->dev, &ucsi_acpi_ops);
+ if (IS_ERR(ua->ucsi))
+ return PTR_ERR(ua->ucsi);
+
+ ucsi_set_drvdata(ua->ucsi, ua);
+
status = acpi_install_notify_handler(ACPI_HANDLE(&pdev->dev),
ACPI_DEVICE_NOTIFY,
ucsi_acpi_notify, ua);
if (ACPI_FAILURE(status)) {
dev_err(&pdev->dev, "failed to install notify handler\n");
+ ucsi_destroy(ua->ucsi);
return -ENODEV;
}
- ua->ucsi = ucsi_register_ppm(&pdev->dev, &ua->ppm);
- if (IS_ERR(ua->ucsi)) {
+ ret = ucsi_register(ua->ucsi);
+ if (ret) {
acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev),
ACPI_DEVICE_NOTIFY,
ucsi_acpi_notify);
- return PTR_ERR(ua->ucsi);
+ ucsi_destroy(ua->ucsi);
+ return ret;
}
platform_set_drvdata(pdev, ua);
@@ -130,7 +184,8 @@ static int ucsi_acpi_remove(struct platform_device *pdev)
{
struct ucsi_acpi *ua = platform_get_drvdata(pdev);
- ucsi_unregister_ppm(ua->ucsi);
+ ucsi_unregister(ua->ucsi);
+ ucsi_destroy(ua->ucsi);
acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev), ACPI_DEVICE_NOTIFY,
ucsi_acpi_notify);
