[PATCH] staging: typec: handle vendor defined part and modify drp toggling flow

From: ShuFanLee
Date: Wed Feb 14 2018 - 04:24:40 EST

From: ShuFanLee <shufan_lee@xxxxxxxxxxx>

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@xxxxxxxxxxx>
---
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);

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);
+ 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);
+ }
+
/*
* 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;
int err;

tcpci = devm_kzalloc(&client->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->vdata = vdata;
tcpci->regmap = devm_regmap_init_i2c(client, &tcpci_regmap_config);
if (IS_ERR(tcpci->regmap))
- return PTR_ERR(tcpci->regmap);
+ return ERR_CAST(tcpci->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);
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;
}

static int tcpci_remove(struct i2c_client *client)
{
struct tcpci *tcpci = i2c_get_clientdata(client);

- tcpm_unregister_port(tcpci->port);
+ tcpci_unregister_port(tcpci);

return 0;
}
diff --git a/drivers/staging/typec/tcpci.h b/drivers/staging/typec/tcpci.h
index fdfb06c..b1fcb4a 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_vendor_data {
+ int (*init)(struct tcpci *tcpci, struct tcpci_vendor_data *data);
+ int (*irq_handler)(struct tcpci *tcpci, struct tcpci_vendor_data *data,
+ u16 *status);
+};
+
+int tcpci_read16(struct tcpci *tcpci, unsigned int reg, u16 *val);
+int tcpci_write16(struct tcpci *tcpci, unsigned int reg, u16 val);
+int tcpci_read8(struct tcpci *tcpci, unsigned int reg, u8 *val);
+int tcpci_write8(struct tcpci *tcpci, unsigned int reg, u8 val);
+struct tcpci *tcpci_register_port(struct i2c_client *client,
+ struct tcpci_vendor_data *data);
+void tcpci_unregister_port(struct tcpci *tcpci);
#endif /* __LINUX_USB_TCPCI_H */
--
1.9.1