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Date: Wed, 14 Feb 2018 12:56:41 +0200
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: ShuFanLee <leechu729@...il.com>
Cc: linux@...ck-us.net, linux-kernel@...r.kernel.org,
linux-usb@...r.kernel.org, cy_huang@...htek.com,
shufan_lee@...htek.com
Subject: Re: [PATCH] staging: typec: handle vendor defined part and modify
drp toggling flow
On Wed, Feb 14, 2018 at 05:24:04PM +0800, ShuFanLee wrote:
> From: ShuFanLee <shufan_lee@...htek.com>
>
> Handle vendor defined behavior in tcpci_init and tcpci_irq.
> More operations can be extended in tcpci_vendor_data if needed.
> According to TCPCI specification, 4.4.5.2 ROLE_CONTROL,
> TCPC shall not start DRP toggling until subsequently the TCPM
> writes to the COMMAND register to start DRP toggling.
> DRP toggling flow is chagned as following:
> - Write DRP = 0 & Rd/Rd
> - Write DRP = 1
> - Set LOOK4CONNECTION command
>
> Signed-off-by: ShuFanLee <shufan_lee@...htek.com>
> ---
> drivers/staging/typec/tcpci.c | 98 ++++++++++++++++++++++++++++++++++++-------
> drivers/staging/typec/tcpci.h | 15 +++++++
> 2 files changed, 97 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/staging/typec/tcpci.c b/drivers/staging/typec/tcpci.c
> index 9bd4412..b3a97b3 100644
> --- a/drivers/staging/typec/tcpci.c
> +++ b/drivers/staging/typec/tcpci.c
> @@ -30,6 +30,7 @@ struct tcpci {
> bool controls_vbus;
>
> struct tcpc_dev tcpc;
> + struct tcpci_vendor_data *vdata;
> };
>
> static inline struct tcpci *tcpc_to_tcpci(struct tcpc_dev *tcpc)
> @@ -37,16 +38,29 @@ static inline struct tcpci *tcpc_to_tcpci(struct tcpc_dev *tcpc)
> return container_of(tcpc, struct tcpci, tcpc);
> }
>
> -static int tcpci_read16(struct tcpci *tcpci, unsigned int reg,
> - u16 *val)
> +int tcpci_read16(struct tcpci *tcpci, unsigned int reg, u16 *val)
> {
> return regmap_raw_read(tcpci->regmap, reg, val, sizeof(u16));
> }
> +EXPORT_SYMBOL_GPL(tcpci_read16);
>
> -static int tcpci_write16(struct tcpci *tcpci, unsigned int reg, u16 val)
> +int tcpci_write16(struct tcpci *tcpci, unsigned int reg, u16 val)
> {
> return regmap_raw_write(tcpci->regmap, reg, &val, sizeof(u16));
> }
> +EXPORT_SYMBOL_GPL(tcpci_write16);
> +
> +int tcpci_read8(struct tcpci *tcpci, unsigned int reg, u8 *val)
> +{
> + return regmap_raw_read(tcpci->regmap, reg, val, sizeof(u8));
> +}
> +EXPORT_SYMBOL_GPL(tcpci_read8);
> +
> +int tcpci_write8(struct tcpci *tcpci, unsigned int reg, u8 val)
> +{
> + return regmap_raw_write(tcpci->regmap, reg, &val, sizeof(u8));
> +}
> +EXPORT_SYMBOL_GPL(tcpci_write8);
I don't think there is any need to export those wrappers. You can
always expect the glue driver to supply the regmap as member of that
struct tcpci_vendor_data. See below..
> static int tcpci_set_cc(struct tcpc_dev *tcpc, enum typec_cc_status cc)
> {
> @@ -98,8 +112,10 @@ static int tcpci_set_cc(struct tcpc_dev *tcpc, enum typec_cc_status cc)
> static int tcpci_start_drp_toggling(struct tcpc_dev *tcpc,
> enum typec_cc_status cc)
> {
> + int ret;
> struct tcpci *tcpci = tcpc_to_tcpci(tcpc);
> - unsigned int reg = TCPC_ROLE_CTRL_DRP;
> + unsigned int reg = (TCPC_ROLE_CTRL_CC_RD << TCPC_ROLE_CTRL_CC1_SHIFT) |
> + (TCPC_ROLE_CTRL_CC_RD << TCPC_ROLE_CTRL_CC2_SHIFT);
>
> switch (cc) {
> default:
> @@ -116,8 +132,19 @@ static int tcpci_start_drp_toggling(struct tcpc_dev *tcpc,
> TCPC_ROLE_CTRL_RP_VAL_SHIFT);
> break;
> }
> -
> - return regmap_write(tcpci->regmap, TCPC_ROLE_CTRL, reg);
> + ret = regmap_write(tcpci->regmap, TCPC_ROLE_CTRL, reg);
> + if (ret < 0)
> + return ret;
> + usleep_range(500, 1000);
> + reg |= TCPC_ROLE_CTRL_DRP;
> + ret = regmap_write(tcpci->regmap, TCPC_ROLE_CTRL, reg);
> + if (ret < 0)
> + return ret;
> + ret = regmap_write(tcpci->regmap, TCPC_COMMAND,
> + TCPC_CMD_LOOK4CONNECTION);
> + if (ret < 0)
> + return ret;
> + return 0;
> }
>
> static enum typec_cc_status tcpci_to_typec_cc(unsigned int cc, bool sink)
> @@ -323,6 +350,15 @@ static int tcpci_init(struct tcpc_dev *tcpc)
> if (time_after(jiffies, timeout))
> return -ETIMEDOUT;
>
> + /* Handle vendor init */
> + if (tcpci->vdata) {
> + if (tcpci->vdata->init) {
> + ret = (*tcpci->vdata->init)(tcpci, tcpci->vdata);
ret = tcpci->vdata->init(...
> + if (ret < 0)
> + return ret;
> + }
> + }
> +
> /* Clear all events */
> ret = tcpci_write16(tcpci, TCPC_ALERT, 0xffff);
> if (ret < 0)
> @@ -351,6 +387,13 @@ static irqreturn_t tcpci_irq(int irq, void *dev_id)
>
> tcpci_read16(tcpci, TCPC_ALERT, &status);
>
> + /* Handle vendor defined interrupt */
> + if (tcpci->vdata) {
> + if (tcpci->vdata->irq_handler)
> + (*tcpci->vdata->irq_handler)(tcpci, tcpci->vdata,
> + &status);
Ditto.
> + }
> +
> /*
> * Clear alert status for everything except RX_STATUS, which shouldn't
> * be cleared until we have successfully retrieved message.
> @@ -417,7 +460,7 @@ static irqreturn_t tcpci_irq(int irq, void *dev_id)
> .reg_bits = 8,
> .val_bits = 8,
>
> - .max_register = 0x7F, /* 0x80 .. 0xFF are vendor defined */
> + .max_register = 0xFF, /* 0x80 .. 0xFF are vendor defined */
> };
>
> static const struct tcpc_config tcpci_tcpc_config = {
> @@ -435,22 +478,22 @@ static int tcpci_parse_config(struct tcpci *tcpci)
> return 0;
> }
>
> -static int tcpci_probe(struct i2c_client *client,
> - const struct i2c_device_id *i2c_id)
> +struct tcpci *tcpci_register_port(struct i2c_client *client,
> + struct tcpci_vendor_data *vdata)
struct tcpci *tcpci_register_port(struct device *dev, struct tcpci_...)
{
...
> {
> struct tcpci *tcpci;
> int err;
>
> tcpci = devm_kzalloc(&client->dev, sizeof(*tcpci), GFP_KERNEL);
> if (!tcpci)
> - return -ENOMEM;
> + return ERR_PTR(-ENOMEM);
>
> tcpci->client = client;
struct tcpci does not need that "client" member.
> tcpci->dev = &client->dev;
tcpci->dev = dev;
> - i2c_set_clientdata(client, tcpci);
> + tcpci->vdata = vdata;
> tcpci->regmap = devm_regmap_init_i2c(client, &tcpci_regmap_config);
You would now do that in your glue driver, and here just:
tcpci->regmap = data->regmap;
> tcpci->tcpc.init = tcpci_init;
> tcpci->tcpc.get_vbus = tcpci_get_vbus;
> @@ -467,7 +510,7 @@ static int tcpci_probe(struct i2c_client *client,
>
> err = tcpci_parse_config(tcpci);
> if (err < 0)
> - return err;
> + return ERR_PTR(err);
>
> /* Disable chip interrupts */
> tcpci_write16(tcpci, TCPC_ALERT_MASK, 0);
> @@ -477,17 +520,40 @@ static int tcpci_probe(struct i2c_client *client,
> IRQF_ONESHOT | IRQF_TRIGGER_LOW,
> dev_name(tcpci->dev), tcpci);
The interrupt could also be requested in the glue driver. Then from
the irq routine in your glue driver, you call tcpci_irq(). That would
mean you export tcpci_irq() of course.
> if (err < 0)
> - return err;
> + return ERR_PTR(err);
>
> tcpci->port = tcpm_register_port(tcpci->dev, &tcpci->tcpc);
> - return PTR_ERR_OR_ZERO(tcpci->port);
> + if (PTR_ERR_OR_ZERO(tcpci->port))
> + return ERR_CAST(tcpci->port);
> +
> + return tcpci;
> +}
> +EXPORT_SYMBOL_GPL(tcpci_register_port);
> +
> +void tcpci_unregister_port(struct tcpci *tcpci)
> +{
> + tcpm_unregister_port(tcpci->port);
> +}
> +EXPORT_SYMBOL_GPL(tcpci_unregister_port);
> +
> +static int tcpci_probe(struct i2c_client *client,
> + const struct i2c_device_id *i2c_id)
> +{
> + struct tcpci *tcpci;
> +
> + tcpci = tcpci_register_port(client, NULL);
> + if (PTR_ERR_OR_ZERO(tcpci))
> + return PTR_ERR(tcpci);
> +
> + i2c_set_clientdata(client, tcpci);
> + return 0;
> }
That would then look something like this:
static int tcpci_probe(struct i2c_client *client...
{
struct tcpci_data data; /* s/tcpci_vendor_data/tcpci_data/ */
struct tcpci *tcpci;
data.regmap = devm_regmap_init_i2c(client, &tcpci_regmap_config);
if (IS_ERR(tcpci->regmap))
return PTR_ERR(tcpci->regmap);
/*
* NOTE: everything in struct tcpci_data should be copied in
* tcpci_register_port().
*/
tcpci = tcpci_register_port(&client->dev, &data);
if (IS_ERR(tcpci))
return PTR_ERR(tcpci);
devm_request_threaded_irq(&client->dev, client->irq, NULL,
tcpci_irq,
...
i2c_set_clientdata(client, tcpci);
return 0;
}
Br,
--
heikki
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