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From: Guenter Roeck <linux@roeck-us.net>
To: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Ajay Gupta <ajayg@nvidia.com>,
	linux-usb@vger.kernel.org
Subject: Re: [PATCH v4 12/18] usb: typec: ucsi: acpi: Move to the new API
Date: Mon, 4 Nov 2019 10:54:51 -0800
Message-ID: <20191104185451.GA5351@roeck-us.net> (raw)
In-Reply-To: <20191104142435.29960-13-heikki.krogerus@linux.intel.com>

On Mon, Nov 04, 2019 at 05:24:29PM +0300, 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@linux.intel.com>

FTR, my request for better (non-)iomem documentation isn't really
that important.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  drivers/usb/typec/ucsi/ucsi_acpi.c | 91 +++++++++++++++++++++++-------
>  1 file changed, 72 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/usb/typec/ucsi/ucsi_acpi.c b/drivers/usb/typec/ucsi/ucsi_acpi.c
> index a18112a83fae..3f1786170098 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 +41,73 @@ 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);
> +
> +	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)
> +		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 +138,39 @@ 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 +182,8 @@ 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);

  parent reply index

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-04 14:24 [PATCH v4 00/18] usb: typec: API improvements Heikki Krogerus
2019-11-04 14:24 ` [PATCH v4 01/18] usb: typec: Copy everything from struct typec_capability during registration Heikki Krogerus
2019-11-04 14:24 ` [PATCH v4 02/18] usb: typec: Introduce typec_get_drvdata() Heikki Krogerus
2019-11-04 14:24 ` [PATCH v4 03/18] usb: typec: Separate the operations vector Heikki Krogerus
2019-11-04 14:24 ` [PATCH v4 04/18] usb: typec: tcpm: Start using struct typec_operations Heikki Krogerus
2019-11-04 14:24 ` [PATCH v4 05/18] usb: typec: tps6598x: " Heikki Krogerus
2019-11-04 14:24 ` [PATCH v4 06/18] usb: typec: ucsi: " Heikki Krogerus
2019-11-04 14:24 ` [PATCH v4 07/18] usb: typec: hd3ss3220: " Heikki Krogerus
2019-11-04 14:24 ` [PATCH v4 08/18] usb: typec: Remove the callback members from struct typec_capability Heikki Krogerus
2019-11-04 14:24 ` [PATCH v4 09/18] usb: typec: Remove unused " Heikki Krogerus
2019-11-04 14:24 ` [PATCH v4 10/18] usb: typec: hd3ss3220: Give the connector fwnode to the port device Heikki Krogerus
2019-11-04 14:24 ` [PATCH v4 11/18] usb: typec: ucsi: Simplified registration and I/O API Heikki Krogerus
2019-11-04 14:24 ` [PATCH v4 12/18] usb: typec: ucsi: acpi: Move to the new API Heikki Krogerus
2019-11-04 14:35   ` Guenter Roeck
2019-11-04 18:54   ` Guenter Roeck [this message]
2019-11-05  8:46     ` Heikki Krogerus
2019-11-04 14:24 ` [PATCH v4 13/18] usb: typec: ucsi: ccg: " Heikki Krogerus
2019-11-04 14:36   ` Guenter Roeck
2019-11-04 14:24 ` [PATCH v4 14/18] usb: typec: ucsi: Remove the old API Heikki Krogerus
2019-11-04 14:38   ` Guenter Roeck
2019-11-04 14:24 ` [PATCH v4 15/18] usb: typec: ucsi: Remove struct ucsi_control Heikki Krogerus
2019-11-04 14:24 ` [PATCH v4 16/18] usb: typec: ucsi: Remove all bit-fields Heikki Krogerus
2019-11-04 14:24 ` [PATCH v4 17/18] usb: typec: ucsi: New error codes Heikki Krogerus
2019-11-04 14:41   ` Guenter Roeck
2019-11-04 14:24 ` [PATCH v4 18/18] usb: typec: ucsi: Optimise ucsi_unregister() Heikki Krogerus
2019-11-04 14:42   ` Guenter Roeck
2019-11-04 15:05 ` [PATCH v4 00/18] usb: typec: API improvements Greg Kroah-Hartman
2019-11-04 18:53   ` Guenter Roeck
2019-11-04 20:53     ` Greg Kroah-Hartman
2019-11-04 20:54   ` Greg Kroah-Hartman

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