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Date: Mon, 5 Mar 2018 23:16:13 +0800
From: 李書帆 <leechu729@...il.com>
To: Guenter Roeck <linux@...ck-us.net>
Cc: heikki.krogerus@...ux.intel.com, Greg KH <greg@...ah.com>,
shufan_lee(李書帆) <shufan_lee@...htek.com>,
cy_huang(黃啟原) <cy_huang@...htek.com>,
Jun Li <jun.li@....com>, linux-kernel@...r.kernel.org,
linux-usb@...r.kernel.org
Subject: Re: [PATCH v6] staging: typec: handle vendor defined part and modify
drp toggling flow
Hi,
2018-03-05 22:49 GMT+08:00 Guenter Roeck <linux@...ck-us.net>:
> On 03/04/2018 08:16 PM, ShuFan Lee wrote:
>>
>> From: ShuFan Lee <shufan_lee@...htek.com>
>>
>> Handle vendor defined behavior in tcpci_init, tcpci_set_vconn,
>> tcpci_start_drp_toggling
>> and export tcpci_irq. More operations can be extended in tcpci_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:
>
>
> s/chagned/changed/
Sorry for the type error, I'll correct it in v7.
>
>
>> - Write DRP = 1, Rp level and RC.CCx to Rd/Rd or Rp/Rp
>> - Set LOOK4CONNECTION command
>>
>> Signed-off-by: ShuFan Lee <shufan_lee@...htek.com>
>> ---
>> drivers/staging/typec/tcpci.c | 134
>> ++++++++++++++++++++++++++++++++++--------
>> drivers/staging/typec/tcpci.h | 15 +++++
>> 2 files changed, 123 insertions(+), 26 deletions(-)
>>
>> patch changelogs between v1 & v2
>> - Remove unnecessary i2c_client in the structure of tcpci
>> - Rename structure of tcpci_vendor_data to tcpci_data
>> - Not exporting tcpci read/write wrappers but register i2c regmap in
>> glue driver
>> - Add set_vconn ops in tcpci_data
>> (It is necessary for RT1711H to enable/disable idle mode before
>> disabling/enabling vconn)
>> - Export tcpci_irq so that vendor can call it in their own IRQ handler
>>
>> patch changelogs between v2 & v3
>> - Change the return type of tcpci_irq from int to irqreturn_t
>>
>> patch changelogs between v3 & v4
>> - Directly return regmap_write at the end of drp_toggling function
>> - Because tcpci_irq is called in _tcpci_irq, move _tcpci_irq to the
>> place after tcpci_irq
>>
>> patch changelogs between v4 & v5
>> - Add a space between my first & last name, from ShuFanLee to ShuFan
>> Lee.
>>
>> patch changelogs between v5 & v6
>> - Add start_drp_toggling in tcpci_data and call it at the beginning of
>> tcpci_start_drp_toggling
>> - Modify the flow of tcpci_start_drp_toggling as following
>> - Set Rp level, RC.CCx to Rd/Rd or Rp/Rp and DRP = 1
>> - Set LOOK4CONNECTION command
>>
>> diff --git a/drivers/staging/typec/tcpci.c b/drivers/staging/typec/tcpci.c
>> index 9bd4412..9e600f7 100644
>> --- a/drivers/staging/typec/tcpci.c
>> +++ b/drivers/staging/typec/tcpci.c
>> @@ -21,7 +21,6 @@
>> struct tcpci {
>> struct device *dev;
>> - struct i2c_client *client;
>> struct tcpm_port *port;
>> @@ -30,6 +29,12 @@ struct tcpci {
>> bool controls_vbus;
>> struct tcpc_dev tcpc;
>> + struct tcpci_data *data;
>> +};
>> +
>> +struct tcpci_chip {
>> + struct tcpci *tcpci;
>> + struct tcpci_data data;
>> };
>> static inline struct tcpci *tcpc_to_tcpci(struct tcpc_dev *tcpc)
>> @@ -37,8 +42,7 @@ 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)
>> +static int tcpci_read16(struct tcpci *tcpci, unsigned int reg, u16 *val)
>> {
>> return regmap_raw_read(tcpci->regmap, reg, val, sizeof(u16));
>> }
>> @@ -98,9 +102,19 @@ 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;
>> + if (tcpci->data) {
>> + if (tcpci->data->start_drp_toggling) {
>
>
> From the code flow it is guaranteed that ->data is set. It should therefore
> be unnecessary to check for it (we don't check if ->reg is set either).
Ok, I'll modify it in v7, thank you.
>
>
>> + ret = tcpci->data->start_drp_toggling(tcpci,
>> + tcpci->data,
>> cc);
>> + if (ret < 0)
>> + return ret;
>> + }
>> + }
>> +
>> switch (cc) {
>> default:
>> case TYPEC_CC_RP_DEF:
>> @@ -117,7 +131,17 @@ static int tcpci_start_drp_toggling(struct tcpc_dev
>> *tcpc,
>> break;
>> }
>> - return regmap_write(tcpci->regmap, TCPC_ROLE_CTRL, reg);
>> + if (cc == TYPEC_CC_RD)
>> + reg |= (TCPC_ROLE_CTRL_CC_RD << TCPC_ROLE_CTRL_CC1_SHIFT)
>> |
>> + (TCPC_ROLE_CTRL_CC_RD <<
>> TCPC_ROLE_CTRL_CC2_SHIFT);
>> + else
>> + reg |= (TCPC_ROLE_CTRL_CC_RP << TCPC_ROLE_CTRL_CC1_SHIFT)
>> |
>> + (TCPC_ROLE_CTRL_CC_RP <<
>> TCPC_ROLE_CTRL_CC2_SHIFT);
>> + ret = regmap_write(tcpci->regmap, TCPC_ROLE_CTRL, reg);
>> + if (ret < 0)
>> + return ret;
>> + return regmap_write(tcpci->regmap, TCPC_COMMAND,
>> + TCPC_CMD_LOOK4CONNECTION);
>> }
>> static enum typec_cc_status tcpci_to_typec_cc(unsigned int cc, bool
>> sink)
>> @@ -178,6 +202,16 @@ static int tcpci_set_vconn(struct tcpc_dev *tcpc,
>> bool enable)
>> struct tcpci *tcpci = tcpc_to_tcpci(tcpc);
>> int ret;
>> + /* Handle vendor set vconn */
>> + if (tcpci->data) {
>> + if (tcpci->data->set_vconn) {
>> + ret = tcpci->data->set_vconn(tcpci, tcpci->data,
>> + enable);
>> + if (ret < 0)
>> + return ret;
>> + }
>> + }
>> +
>> ret = regmap_write(tcpci->regmap, TCPC_POWER_CTRL,
>> enable ? TCPC_POWER_CTRL_VCONN_ENABLE : 0);
>> if (ret < 0)
>> @@ -323,6 +357,15 @@ static int tcpci_init(struct tcpc_dev *tcpc)
>> if (time_after(jiffies, timeout))
>> return -ETIMEDOUT;
>> + /* Handle vendor init */
>> + if (tcpci->data) {
>> + if (tcpci->data->init) {
>> + ret = tcpci->data->init(tcpci, tcpci->data);
>> + if (ret < 0)
>> + return ret;
>> + }
>> + }
>> +
>> /* Clear all events */
>> ret = tcpci_write16(tcpci, TCPC_ALERT, 0xffff);
>> if (ret < 0)
>> @@ -344,9 +387,8 @@ static int tcpci_init(struct tcpc_dev *tcpc)
>> return tcpci_write16(tcpci, TCPC_ALERT_MASK, reg);
>> }
>> -static irqreturn_t tcpci_irq(int irq, void *dev_id)
>> +irqreturn_t tcpci_irq(struct tcpci *tcpci)
>> {
>> - struct tcpci *tcpci = dev_id;
>> u16 status;
>> tcpci_read16(tcpci, TCPC_ALERT, &status);
>> @@ -412,6 +454,14 @@ static irqreturn_t tcpci_irq(int irq, void *dev_id)
>> return IRQ_HANDLED;
>> }
>> +EXPORT_SYMBOL_GPL(tcpci_irq);
>> +
>> +static irqreturn_t _tcpci_irq(int irq, void *dev_id)
>> +{
>> + struct tcpci *tcpci = dev_id;
>> +
>> + return tcpci_irq(tcpci);
>> +}
>> static const struct regmap_config tcpci_regmap_config = {
>> .reg_bits = 8,
>> @@ -435,22 +485,18 @@ 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 device *dev, struct tcpci_data
>> *data)
>> {
>> struct tcpci *tcpci;
>> int err;
>> - tcpci = devm_kzalloc(&client->dev, sizeof(*tcpci), GFP_KERNEL);
>> + tcpci = devm_kzalloc(dev, sizeof(*tcpci), GFP_KERNEL);
>> if (!tcpci)
>> - return -ENOMEM;
>> + return ERR_PTR(-ENOMEM);
>> - tcpci->client = client;
>> - tcpci->dev = &client->dev;
>> - i2c_set_clientdata(client, tcpci);
>> - tcpci->regmap = devm_regmap_init_i2c(client,
>> &tcpci_regmap_config);
>> - if (IS_ERR(tcpci->regmap))
>> - return PTR_ERR(tcpci->regmap);
>> + tcpci->dev = dev;
>> + tcpci->data = data;
>> + tcpci->regmap = data->regmap;
>> tcpci->tcpc.init = tcpci_init;
>> tcpci->tcpc.get_vbus = tcpci_get_vbus;
>> @@ -467,27 +513,63 @@ static int tcpci_probe(struct i2c_client *client,
>> err = tcpci_parse_config(tcpci);
>> if (err < 0)
>> - return err;
>> + return ERR_PTR(err);
>> +
>> + tcpci->port = tcpm_register_port(tcpci->dev, &tcpci->tcpc);
>> + if (PTR_ERR_OR_ZERO(tcpci->port))
>> + return ERR_CAST(tcpci->port);
>> - /* Disable chip interrupts */
>> - tcpci_write16(tcpci, TCPC_ALERT_MASK, 0);
>> + 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);
>> - err = devm_request_threaded_irq(tcpci->dev, client->irq, NULL,
>> - tcpci_irq,
>> +static int tcpci_probe(struct i2c_client *client,
>> + const struct i2c_device_id *i2c_id)
>> +{
>> + struct tcpci_chip *chip;
>> + int err;
>> + u16 val = 0;
>> +
>> + chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
>> + if (!chip)
>> + return -ENOMEM;
>> +
>> + chip->data.regmap = devm_regmap_init_i2c(client,
>> &tcpci_regmap_config);
>> + if (IS_ERR(chip->data.regmap))
>> + return PTR_ERR(chip->data.regmap);
>> +
>> + /* Disable chip interrupts before requesting irq */
>> + err = regmap_raw_write(chip->data.regmap, TCPC_ALERT_MASK, &val,
>> + sizeof(u16));
>> + if (err < 0)
>> + return err;
>> +
>> + err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
>> + _tcpci_irq,
>> IRQF_ONESHOT | IRQF_TRIGGER_LOW,
>> - dev_name(tcpci->dev), tcpci);
>> + dev_name(&client->dev), chip);
>> if (err < 0)
>> return err;
>> - tcpci->port = tcpm_register_port(tcpci->dev, &tcpci->tcpc);
>> - return PTR_ERR_OR_ZERO(tcpci->port);
>> + chip->tcpci = tcpci_register_port(&client->dev, &chip->data);
>> + if (PTR_ERR_OR_ZERO(chip->tcpci))
>> + return PTR_ERR(chip->tcpci);
>> +
>> + i2c_set_clientdata(client, chip);
>> + return 0;
>> }
>> static int tcpci_remove(struct i2c_client *client)
>> {
>> - struct tcpci *tcpci = i2c_get_clientdata(client);
>> + struct tcpci_chip *chip = i2c_get_clientdata(client);
>> - tcpm_unregister_port(tcpci->port);
>> + tcpci_unregister_port(chip->tcpci);
>> return 0;
>> }
>> diff --git a/drivers/staging/typec/tcpci.h b/drivers/staging/typec/tcpci.h
>> index fdfb06c..a2c1754 100644
>> --- a/drivers/staging/typec/tcpci.h
>> +++ b/drivers/staging/typec/tcpci.h
>> @@ -59,6 +59,7 @@
>> #define TCPC_POWER_CTRL_VCONN_ENABLE BIT(0)
>> #define TCPC_CC_STATUS 0x1d
>> +#define TCPC_CC_STATUS_DRPRST BIT(5)
>> #define TCPC_CC_STATUS_TERM BIT(4)
>> #define TCPC_CC_STATUS_CC2_SHIFT 2
>> #define TCPC_CC_STATUS_CC2_MASK 0x3
>> @@ -121,4 +122,18 @@
>> #define TCPC_VBUS_VOLTAGE_ALARM_HI_CFG 0x76
>> #define TCPC_VBUS_VOLTAGE_ALARM_LO_CFG 0x78
>> +struct tcpci;
>> +struct tcpci_data {
>> + struct regmap *regmap;
>> + int (*init)(struct tcpci *tcpci, struct tcpci_data *data);
>> + int (*set_vconn)(struct tcpci *tcpci, struct tcpci_data *data,
>> + bool enable);
>> + int (*start_drp_toggling)(struct tcpci *tcpci, struct tcpci_data
>> *data,
>> + enum typec_cc_status cc);
>> +};
>> +
>> +struct tcpci *tcpci_register_port(struct device *dev, struct tcpci_data
>> *data);
>> +void tcpci_unregister_port(struct tcpci *tcpci);
>> +irqreturn_t tcpci_irq(struct tcpci *tcpci);
>> +
>> #endif /* __LINUX_USB_TCPCI_H */
>>
>
--
Best Regards,
書帆
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