On 3/11/21 9:24 PM, Badhri Jagan Sridharan wrote:
> The change exposes the data_role and the orientation as a extcon
> interface for configuring the USB data controller.
>
> Signed-off-by: Badhri Jagan Sridharan <bad...@google.com>
> ---
> Changes since V1:
> - Dropped changes related to get_/set_current_limit and pd_capable
> callback. Will send them in as separate patches.
> ---
> drivers/usb/typec/tcpm/tcpci_maxim.c | 56 ++++++++++++++++++++++++++++
> 1 file changed, 56 insertions(+)
>
> diff --git a/drivers/usb/typec/tcpm/tcpci_maxim.c
> b/drivers/usb/typec/tcpm/tcpci_maxim.c
> index 041a1c393594..1210445713ee 100644
> --- a/drivers/usb/typec/tcpm/tcpci_maxim.c
> +++ b/drivers/usb/typec/tcpm/tcpci_maxim.c
> @@ -7,6 +7,8 @@
>
> #include <linux/interrupt.h>
> #include <linux/i2c.h>
> +#include <linux/extcon.h>
> +#include <linux/extcon-provider.h>
> #include <linux/kernel.h>
> #include <linux/module.h>
> #include <linux/regmap.h>
> @@ -46,6 +48,8 @@ struct max_tcpci_chip {
> struct device *dev;
> struct i2c_client *client;
> struct tcpm_port *port;
> + bool attached;
> + struct extcon_dev *extcon;
> };
>
> static const struct regmap_range max_tcpci_tcpci_range[] = {
> @@ -439,6 +443,39 @@ static int tcpci_init(struct tcpci *tcpci, struct
> tcpci_data *data)
> return -1;
> }
>
> +static void max_tcpci_set_roles(struct tcpci *tcpci, struct tcpci_data
> *data, bool attached,
> + enum typec_role role, enum typec_data_role
> data_role)
> +{
> + struct max_tcpci_chip *chip = tdata_to_max_tcpci(data);
> +
> + chip->attached = attached;
> +
> + if (!attached) {
> + extcon_set_state_sync(chip->extcon, EXTCON_USB_HOST, 0);
> + extcon_set_state_sync(chip->extcon, EXTCON_USB, 0);
> + return;
> + }
> +
> + extcon_set_state_sync(chip->extcon, data_role == TYPEC_HOST ?
> EXTCON_USB_HOST : EXTCON_USB,
> + 1);
> +}
> +
> +static void max_tcpci_set_cc_polarity(struct tcpci *tcpci, struct tcpci_data
> *data,
> + enum typec_cc_polarity polarity)
> +{
> + struct max_tcpci_chip *chip = tdata_to_max_tcpci(data);
> +
> + extcon_set_property(chip->extcon, EXTCON_USB,
> EXTCON_PROP_USB_TYPEC_POLARITY,
> + (union extcon_property_value)(int)polarity);
> + extcon_set_property(chip->extcon, EXTCON_USB_HOST,
> EXTCON_PROP_USB_TYPEC_POLARITY,
> + (union extcon_property_value)(int)polarity);
> +}
> +
> +static const unsigned int usbpd_extcon[] = {
> + EXTCON_USB,
> + EXTCON_USB_HOST,
> +};
> +
> static int max_tcpci_probe(struct i2c_client *client, const struct
> i2c_device_id *i2c_id)
> {
> int ret;
> @@ -472,6 +509,8 @@ static int max_tcpci_probe(struct i2c_client *client,
> const struct i2c_device_id
> chip->data.auto_discharge_disconnect = true;
> chip->data.vbus_vsafe0v = true;
> chip->data.set_partner_usb_comm_capable =
> max_tcpci_set_partner_usb_comm_capable;
> + chip->data.set_roles = max_tcpci_set_roles;
> + chip->data.set_cc_polarity = max_tcpci_set_cc_polarity;
>
> max_tcpci_init_regs(chip);
> chip->tcpci = tcpci_register_port(chip->dev, &chip->data);
> @@ -484,6 +523,23 @@ static int max_tcpci_probe(struct i2c_client *client,
> const struct i2c_device_id
> if (ret < 0)
> goto unreg_port;
>
> + chip->extcon = devm_extcon_dev_allocate(&client->dev, usbpd_extcon);
> + if (IS_ERR(chip->extcon)) {
> + dev_err(&client->dev, "Error allocating extcon: %ld\n",
> PTR_ERR(chip->extcon));
> + ret = PTR_ERR(chip->extcon);
> + goto unreg_port;
> + }
> +
> + ret = devm_extcon_dev_register(&client->dev, chip->extcon);
> + if (ret < 0) {
> + dev_err(&client->dev, "failed to register extcon device");
> + goto unreg_port;
> + }
Effectively this mandates extcon support to be able to use this driver/chip.
Does that make sense ? If this is indeed mandatory, how did it work so far ?
Also, what makes this code chip specific ?
Thanks,
Guenter
> +
> + extcon_set_property_capability(chip->extcon, EXTCON_USB,
> EXTCON_PROP_USB_TYPEC_POLARITY);
> + extcon_set_property_capability(chip->extcon, EXTCON_USB_HOST,
> + EXTCON_PROP_USB_TYPEC_POLARITY);
> +
> device_init_wakeup(chip->dev, true);
> return 0;
>
>
