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extcon: usbc-tusb320: Add support for TUSB320L 

TUSB320L is a newer chip with additional features, and it has additional steps
in its mode changing sequence:
 - Disable CC state machine,
 - Write to mode register,
 - Wait for 5 ms,
 - Re-enable CC state machine.
It also has an additional register that a revision number can be read from.

Add support for the mode changing sequence, and read the revision number during
probe and print it as info.

Signed-off-by: Yassine Oudjana <y.oudjana@protonmail.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Yassine Oudjana 2021-09-25 05:45:54 +00:00 committed by Chanwoo Choi
parent 70c55d6be6
commit ce0320bd38
1 changed files with 79 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

82
drivers/extcon/extcon-usbc-tusb320.c
View File

@ -21,10 +21,13 @@
#define TUSB320_REG9_INTERRUPT_STATUS BIT(4)
#define TUSB320_REGA 0xa
#define TUSB320L_REGA_DISABLE_TERM BIT(0)
#define TUSB320_REGA_I2C_SOFT_RESET BIT(3)
#define TUSB320_REGA_MODE_SELECT_SHIFT 4
#define TUSB320_REGA_MODE_SELECT_MASK 0x3
#define TUSB320L_REGA0_REVISION 0xa0
enum tusb320_attached_state {
TUSB320_ATTACHED_STATE_NONE,
TUSB320_ATTACHED_STATE_DFP,
@ -39,11 +42,18 @@ enum tusb320_mode {
TUSB320_MODE_DRP,
};
struct tusb320_priv;
struct tusb320_ops {
int (*set_mode)(struct tusb320_priv *priv, enum tusb320_mode mode);
int (*get_revision)(struct tusb320_priv *priv, unsigned int *revision);
};
struct tusb320_priv {
struct device *dev;
struct regmap *regmap;
struct extcon_dev *edev;
struct tusb320_ops *ops;
enum tusb320_attached_state state;
};
@ -99,12 +109,46 @@ static int tusb320_set_mode(struct tusb320_priv *priv, enum tusb320_mode mode)
return 0;
}
static int tusb320l_set_mode(struct tusb320_priv *priv, enum tusb320_mode mode)
{
int ret;
/* Disable CC state machine */
ret = regmap_write_bits(priv->regmap, TUSB320_REGA,
TUSB320L_REGA_DISABLE_TERM, 1);
if (ret) {
dev_err(priv->dev,
"failed to disable CC state machine: %d\n", ret);
return ret;
}
/* Write mode */
ret = regmap_write_bits(priv->regmap, TUSB320_REGA,
TUSB320_REGA_MODE_SELECT_MASK << TUSB320_REGA_MODE_SELECT_SHIFT,
mode << TUSB320_REGA_MODE_SELECT_SHIFT);
if (ret) {
dev_err(priv->dev, "failed to write mode: %d\n", ret);
goto err;
}
msleep(5);
err:
/* Re-enable CC state machine */
ret = regmap_write_bits(priv->regmap, TUSB320_REGA,
TUSB320L_REGA_DISABLE_TERM, 0);
if (ret)
dev_err(priv->dev,
"failed to re-enable CC state machine: %d\n", ret);
return ret;
}
static int tusb320_reset(struct tusb320_priv *priv)
{
int ret;
/* Set mode to default (follow PORT pin) */
ret = tusb320_set_mode(priv, TUSB320_MODE_PORT);
ret = priv->ops->set_mode(priv, TUSB320_MODE_PORT);
if (ret && ret != -EBUSY) {
dev_err(priv->dev,
"failed to set mode to PORT: %d\n", ret);
@ -126,6 +170,20 @@ static int tusb320_reset(struct tusb320_priv *priv)
return 0;
}
static int tusb320l_get_revision(struct tusb320_priv *priv, unsigned int *revision)
{
return regmap_read(priv->regmap, TUSB320L_REGA0_REVISION, revision);
}
static struct tusb320_ops tusb320_ops = {
.set_mode = tusb320_set_mode,
};
static struct tusb320_ops tusb320l_ops = {
.set_mode = tusb320l_set_mode,
.get_revision = tusb320l_get_revision,
};
static irqreturn_t tusb320_irq_handler(int irq, void *dev_id)
{
struct tusb320_priv *priv = dev_id;
@ -176,6 +234,8 @@ static int tusb320_extcon_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct tusb320_priv *priv;
const void *match_data;
unsigned int revision;
int ret;
priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
@ -191,12 +251,27 @@ static int tusb320_extcon_probe(struct i2c_client *client,
if (ret)
return ret;
match_data = device_get_match_data(&client->dev);
if (!match_data)
return -EINVAL;
priv->ops = (struct tusb320_ops*)match_data;
priv->edev = devm_extcon_dev_allocate(priv->dev, tusb320_extcon_cable);
if (IS_ERR(priv->edev)) {
dev_err(priv->dev, "failed to allocate extcon device\n");
return PTR_ERR(priv->edev);
}
if (priv->ops->get_revision) {
ret = priv->ops->get_revision(priv, &revision);
if (ret)
dev_warn(priv->dev,
"failed to read revision register: %d\n", ret);
else
dev_info(priv->dev, "chip revision %d\n", revision);
}
ret = devm_extcon_dev_register(priv->dev, priv->edev);
if (ret < 0) {
dev_err(priv->dev, "failed to register extcon device\n");
@ -231,7 +306,8 @@ static int tusb320_extcon_probe(struct i2c_client *client,
}
static const struct of_device_id tusb320_extcon_dt_match[] = {
{ .compatible = "ti,tusb320", },
{ .compatible = "ti,tusb320", .data = &tusb320_ops, },
{ .compatible = "ti,tusb320l", .data = &tusb320l_ops, },
{ }
};
MODULE_DEVICE_TABLE(of, tusb320_extcon_dt_match);