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authorYassine Oudjana <y.oudjana@protonmail.com>2021-09-25 08:45:54 +0300
committerChanwoo Choi <cw00.choi@samsung.com>2021-10-27 08:13:39 +0300
commitce0320bd3872038569be360870e2d5251b975692 (patch)
tree8780c32e27ada3d3b551f230d43df811e0498f09 /drivers/extcon
parent70c55d6be634e5f9894169340f3fe5c73f53ac2d (diff)
downloadlinux-ce0320bd3872038569be360870e2d5251b975692.tar.xz
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>
Diffstat (limited to 'drivers/extcon')
-rw-r--r--drivers/extcon/extcon-usbc-tusb320.c82
1 files changed, 79 insertions, 3 deletions
diff --git a/drivers/extcon/extcon-usbc-tusb320.c b/drivers/extcon/extcon-usbc-tusb320.c
index 1ed1dfe54206..6ba3d89b106d 100644
--- a/drivers/extcon/extcon-usbc-tusb320.c
+++ b/drivers/extcon/extcon-usbc-tusb320.c
@@ -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);