[PATCH RFC 3/7] usb: typec: ucsi: split read operation

From: Dmitry Baryshkov
Date: Sun Jun 02 2024 - 19:25:45 EST

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The read operation is only used to read fixed data at fixed offsets
(UCSI_VERSION, UCSI_CCI, UCSI_MESSAGE_IN). In some cases drivers apply
offset-specific overrides. Split the read() operation into three
operations, read_version(), read_cci(), read_message_in().

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
drivers/usb/typec/ucsi/ucsi.c | 20 ++++++------
drivers/usb/typec/ucsi/ucsi.h | 9 ++++--
drivers/usb/typec/ucsi/ucsi_acpi.c | 60 +++++++++++++++++++++++++++++------
drivers/usb/typec/ucsi/ucsi_ccg.c | 50 +++++++++++++++--------------
drivers/usb/typec/ucsi/ucsi_glink.c | 19 ++++++++++-
drivers/usb/typec/ucsi/ucsi_stm32g0.c | 19 ++++++++++-
6 files changed, 130 insertions(+), 47 deletions(-)

diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index f58908a76e1d..a3a29ea4e325 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -46,7 +46,7 @@ static int ucsi_read_message_in(struct ucsi *ucsi, void *buf,
if (ucsi->version <= UCSI_VERSION_1_2)
buf_size = clamp(buf_size, 0, 16);

- return ucsi->ops->read(ucsi, UCSI_MESSAGE_IN, buf, buf_size);
+ return ucsi->ops->read_message_in(ucsi, buf, buf_size);
}

static int ucsi_acknowledge(struct ucsi *ucsi, bool conn_ack)
@@ -130,7 +130,7 @@ static int ucsi_exec_command(struct ucsi *ucsi, u64 cmd)
if (ret)
return ret;

- ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci));
+ ret = ucsi->ops->read_cci(ucsi, &cci);
if (ret)
return ret;

@@ -1294,7 +1294,7 @@ static int ucsi_reset_ppm(struct ucsi *ucsi)

mutex_lock(&ucsi->ppm_lock);

- ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci));
+ ret = ucsi->ops->read_cci(ucsi, &cci);
if (ret < 0)
goto out;

@@ -1312,8 +1312,7 @@ static int ucsi_reset_ppm(struct ucsi *ucsi)

tmo = jiffies + msecs_to_jiffies(UCSI_TIMEOUT_MS);
do {
- ret = ucsi->ops->read(ucsi, UCSI_CCI,
- &cci, sizeof(cci));
+ ret = ucsi->ops->read_cci(ucsi, &cci);
if (ret < 0)
goto out;
if (cci & UCSI_CCI_COMMAND_COMPLETE)
@@ -1342,7 +1341,7 @@ static int ucsi_reset_ppm(struct ucsi *ucsi)
/* Give the PPM time to process a reset before reading CCI */
msleep(20);

- ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci));
+ ret = ucsi->ops->read_cci(ucsi, &cci);
if (ret)
goto out;

@@ -1745,7 +1744,7 @@ static int ucsi_init(struct ucsi *ucsi)
ucsi->ntfy = ntfy;

mutex_lock(&ucsi->ppm_lock);
- ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci));
+ ret = ucsi->ops->read_cci(ucsi, &cci);
mutex_unlock(&ucsi->ppm_lock);
if (ret)
return ret;
@@ -1859,7 +1858,9 @@ struct ucsi *ucsi_create(struct device *dev, const struct ucsi_operations *ops)
{
struct ucsi *ucsi;

- if (!ops || !ops->read || !ops->sync_control || !ops->async_control)
+ if (!ops ||
+ !ops->read_version || !ops->read_cci || !ops->read_message_in ||
+ !ops->sync_control || !ops->async_control)
return ERR_PTR(-EINVAL);

ucsi = kzalloc(sizeof(*ucsi), GFP_KERNEL);
@@ -1895,8 +1896,7 @@ int ucsi_register(struct ucsi *ucsi)
{
int ret;

- ret = ucsi->ops->read(ucsi, UCSI_VERSION, &ucsi->version,
- sizeof(ucsi->version));
+ ret = ucsi->ops->read_version(ucsi, &ucsi->version);
if (ret)
return ret;

diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h
index 94ea54d3d47d..f770e1070424 100644
--- a/drivers/usb/typec/ucsi/ucsi.h
+++ b/drivers/usb/typec/ucsi/ucsi.h
@@ -56,7 +56,9 @@ struct dentry;

/**
* struct ucsi_operations - UCSI I/O operations
- * @read: Read operation
+ * @read_version: Read implemented UCSI version
+ * @read_cci: Read CCI register
+ * @read_message_in: Read message data from UCSI
* @sync_control: Blocking control operation
* @async_control: Non-blocking control operation
* @update_altmodes: Squashes duplicate DP altmodes
@@ -68,8 +70,9 @@ struct dentry;
* return immediately after sending the data to the PPM.
*/
struct ucsi_operations {
- int (*read)(struct ucsi *ucsi, unsigned int offset,
- void *val, size_t val_len);
+ int (*read_version)(struct ucsi *ucsi, u16 *version);
+ int (*read_cci)(struct ucsi *ucsi, u32 *cci);
+ int (*read_message_in)(struct ucsi *ucsi, void *val, size_t val_len);
int (*sync_control)(struct ucsi *ucsi, u64 command);
int (*async_control)(struct ucsi *ucsi, u64 command);
bool (*update_altmodes)(struct ucsi *ucsi, struct ucsi_altmode *orig,
diff --git a/drivers/usb/typec/ucsi/ucsi_acpi.c b/drivers/usb/typec/ucsi/ucsi_acpi.c
index feccbfc8acbe..61dd28dae3a4 100644
--- a/drivers/usb/typec/ucsi/ucsi_acpi.c
+++ b/drivers/usb/typec/ucsi/ucsi_acpi.c
@@ -45,8 +45,7 @@ static int ucsi_acpi_dsm(struct ucsi_acpi *ua, int func)
return 0;
}

-static int ucsi_acpi_read(struct ucsi *ucsi, unsigned int offset,
- void *val, size_t val_len)
+static int ucsi_acpi_read_version(struct ucsi *ucsi, u16 *version)
{
struct ucsi_acpi *ua = ucsi_get_drvdata(ucsi);
int ret;
@@ -55,7 +54,35 @@ static int ucsi_acpi_read(struct ucsi *ucsi, unsigned int offset,
if (ret)
return ret;

- memcpy(val, ua->base + offset, val_len);
+ memcpy(version, ua->base + UCSI_VERSION, sizeof(*version));
+
+ return 0;
+}
+
+static int ucsi_acpi_read_cci(struct ucsi *ucsi, u32 *cci)
+{
+ struct ucsi_acpi *ua = ucsi_get_drvdata(ucsi);
+ int ret;
+
+ ret = ucsi_acpi_dsm(ua, UCSI_DSM_FUNC_READ);
+ if (ret)
+ return ret;
+
+ memcpy(cci, ua->base + UCSI_CCI, sizeof(*cci));
+
+ return 0;
+}
+
+static int ucsi_acpi_read_message_in(struct ucsi *ucsi, void *val, size_t val_len)
+{
+ struct ucsi_acpi *ua = ucsi_get_drvdata(ucsi);
+ int ret;
+
+ ret = ucsi_acpi_dsm(ua, UCSI_DSM_FUNC_READ);
+ if (ret)
+ return ret;
+
+ memcpy(val, ua->base + UCSI_MESSAGE_IN, val_len);

return 0;
}
@@ -98,30 +125,45 @@ static int ucsi_acpi_sync_control(struct ucsi *ucsi, u64 command)
}

static const struct ucsi_operations ucsi_acpi_ops = {
- .read = ucsi_acpi_read,
+ .read_version = ucsi_acpi_read_version,
+ .read_cci = ucsi_acpi_read_cci,
+ .read_message_in = ucsi_acpi_read_message_in,
.sync_control = ucsi_acpi_sync_control,
.async_control = ucsi_acpi_async_control
};

static int
-ucsi_zenbook_read(struct ucsi *ucsi, unsigned int offset, void *val, size_t val_len)
+ucsi_zenbook_read_cci(struct ucsi *ucsi, u32 *cci)
{
struct ucsi_acpi *ua = ucsi_get_drvdata(ucsi);
int ret;

- if (offset == UCSI_VERSION || UCSI_COMMAND(ua->cmd) == UCSI_PPM_RESET) {
+ if (UCSI_COMMAND(ua->cmd) == UCSI_PPM_RESET) {
ret = ucsi_acpi_dsm(ua, UCSI_DSM_FUNC_READ);
if (ret)
return ret;
}

- memcpy(val, ua->base + offset, val_len);
+ memcpy(cci, ua->base + UCSI_CCI, sizeof(*cci));
+
+ return 0;
+}
+
+static int
+ucsi_zenbook_read_message_in(struct ucsi *ucsi, void *val, size_t val_len)
+{
+ struct ucsi_acpi *ua = ucsi_get_drvdata(ucsi);
+
+ /* UCSI_MESSAGE_IN is never read for PPM_RESET, return stored data */
+ memcpy(val, ua->base + UCSI_MESSAGE_IN, val_len);

return 0;
}

static const struct ucsi_operations ucsi_zenbook_ops = {
- .read = ucsi_zenbook_read,
+ .read_version = ucsi_acpi_read_version,
+ .read_cci = ucsi_zenbook_read_cci,
+ .read_message_in = ucsi_zenbook_read_message_in,
.sync_control = ucsi_acpi_sync_control,
.async_control = ucsi_acpi_async_control
};
@@ -143,7 +185,7 @@ static void ucsi_acpi_notify(acpi_handle handle, u32 event, void *data)
u32 cci;
int ret;

- ret = ua->ucsi->ops->read(ua->ucsi, UCSI_CCI, &cci, sizeof(cci));
+ ret = ua->ucsi->ops->read_cci(ua->ucsi, &cci);
if (ret)
return;

diff --git a/drivers/usb/typec/ucsi/ucsi_ccg.c b/drivers/usb/typec/ucsi/ucsi_ccg.c
index 76b39bb9762d..6ccc394f268e 100644
--- a/drivers/usb/typec/ucsi/ucsi_ccg.c
+++ b/drivers/usb/typec/ucsi/ucsi_ccg.c
@@ -556,32 +556,34 @@ static void ucsi_ccg_nvidia_altmode(struct ucsi_ccg *uc,
}
}

-static int ucsi_ccg_read(struct ucsi *ucsi, unsigned int offset,
- void *val, size_t val_len)
+static int ucsi_ccg_read_version(struct ucsi *ucsi, u16 *version)
{
struct ucsi_ccg *uc = ucsi_get_drvdata(ucsi);
- u16 reg = CCGX_RAB_UCSI_DATA_BLOCK(offset);
- struct ucsi_capability *cap;
- struct ucsi_altmode *alt;
- int ret = 0;
+ u16 reg = CCGX_RAB_UCSI_DATA_BLOCK(UCSI_VERSION);

- if (offset == UCSI_CCI) {
- spin_lock(&uc->op_lock);
- memcpy(val, &(uc->op_data).cci, val_len);
- spin_unlock(&uc->op_lock);
- } else if (offset == UCSI_MESSAGE_IN) {
- spin_lock(&uc->op_lock);
- memcpy(val, &(uc->op_data).message_in, val_len);
- spin_unlock(&uc->op_lock);
- } else {
- ret = ccg_read(uc, reg, val, val_len);
- }
+ return ccg_read(uc, reg, (u8 *)version, sizeof(*version));
+}

- if (ret)
- return ret;
+static int ucsi_ccg_read_cci(struct ucsi *ucsi, u32 *cci)
+{
+ struct ucsi_ccg *uc = ucsi_get_drvdata(ucsi);

- if (offset != UCSI_MESSAGE_IN)
- return ret;
+ spin_lock(&uc->op_lock);
+ *cci = uc->op_data.cci;
+ spin_unlock(&uc->op_lock);
+
+ return 0;
+}
+
+static int ucsi_ccg_read_message_in(struct ucsi *ucsi, void *val, size_t val_len)
+{
+ struct ucsi_ccg *uc = ucsi_get_drvdata(ucsi);
+ struct ucsi_capability *cap;
+ struct ucsi_altmode *alt;
+
+ spin_lock(&uc->op_lock);
+ memcpy(val, uc->op_data.message_in, val_len);
+ spin_unlock(&uc->op_lock);

switch (UCSI_COMMAND(uc->last_cmd_sent)) {
case UCSI_GET_CURRENT_CAM:
@@ -607,7 +609,7 @@ static int ucsi_ccg_read(struct ucsi *ucsi, unsigned int offset,
}
uc->last_cmd_sent = 0;

- return ret;
+ return 0;
}

static int ucsi_ccg_async_control(struct ucsi *ucsi, u64 command)
@@ -663,7 +665,9 @@ static int ucsi_ccg_sync_control(struct ucsi *ucsi, u64 command)
}

static const struct ucsi_operations ucsi_ccg_ops = {
- .read = ucsi_ccg_read,
+ .read_version = ucsi_ccg_read_version,
+ .read_cci = ucsi_ccg_read_cci,
+ .read_message_in = ucsi_ccg_read_message_in,
.sync_control = ucsi_ccg_sync_control,
.async_control = ucsi_ccg_async_control,
.update_altmodes = ucsi_ccg_update_altmodes
diff --git a/drivers/usb/typec/ucsi/ucsi_glink.c b/drivers/usb/typec/ucsi/ucsi_glink.c
index 047998f33274..7f6a48624ee5 100644
--- a/drivers/usb/typec/ucsi/ucsi_glink.c
+++ b/drivers/usb/typec/ucsi/ucsi_glink.c
@@ -114,6 +114,21 @@ static int pmic_glink_ucsi_read(struct ucsi *__ucsi, unsigned int offset,
return ret;
}

+static int pmic_glink_ucsi_read_version(struct ucsi *ucsi, u16 *version)
+{
+ return pmic_glink_ucsi_read(ucsi, UCSI_VERSION, version, sizeof(*version));
+}
+
+static int pmic_glink_ucsi_read_cci(struct ucsi *ucsi, u32 *cci)
+{
+ return pmic_glink_ucsi_read(ucsi, UCSI_CCI, cci, sizeof(*cci));
+}
+
+static int pmic_glink_ucsi_read_message_in(struct ucsi *ucsi, void *val, size_t val_len)
+{
+ return pmic_glink_ucsi_read(ucsi, UCSI_MESSAGE_IN, val, val_len);
+}
+
static int pmic_glink_ucsi_locked_write(struct pmic_glink_ucsi *ucsi, unsigned int offset,
const void *val, size_t val_len)
{
@@ -214,7 +229,9 @@ static void pmic_glink_ucsi_connector_status(struct ucsi_connector *con)
}

static const struct ucsi_operations pmic_glink_ucsi_ops = {
- .read = pmic_glink_ucsi_read,
+ .read_version = pmic_glink_ucsi_read_version,
+ .read_cci = pmic_glink_ucsi_read_cci,
+ .read_message_in = pmic_glink_ucsi_read_message_in,
.sync_control = pmic_glink_ucsi_sync_control,
.async_control = pmic_glink_ucsi_async_control,
.update_connector = pmic_glink_ucsi_update_connector,
diff --git a/drivers/usb/typec/ucsi/ucsi_stm32g0.c b/drivers/usb/typec/ucsi/ucsi_stm32g0.c
index f97dc5a075e2..e3cfcb258e43 100644
--- a/drivers/usb/typec/ucsi/ucsi_stm32g0.c
+++ b/drivers/usb/typec/ucsi/ucsi_stm32g0.c
@@ -359,6 +359,21 @@ static int ucsi_stm32g0_read(struct ucsi *ucsi, unsigned int offset, void *val,
return 0;
}

+static int ucsi_stm32g0_read_version(struct ucsi *ucsi, u16 *version)
+{
+ return ucsi_stm32g0_read(ucsi, UCSI_VERSION, version, sizeof(*version));
+}
+
+static int ucsi_stm32g0_read_cci(struct ucsi *ucsi, u32 *cci)
+{
+ return ucsi_stm32g0_read(ucsi, UCSI_CCI, cci, sizeof(*cci));
+}
+
+static int ucsi_stm32g0_read_message_in(struct ucsi *ucsi, void *val, size_t len)
+{
+ return ucsi_stm32g0_read(ucsi, UCSI_MESSAGE_IN, val, len);
+}
+
static int ucsi_stm32g0_async_control(struct ucsi *ucsi, u64 command)
{
struct ucsi_stm32g0 *g0 = ucsi_get_drvdata(ucsi);
@@ -446,7 +461,9 @@ static irqreturn_t ucsi_stm32g0_irq_handler(int irq, void *data)
}

static const struct ucsi_operations ucsi_stm32g0_ops = {
- .read = ucsi_stm32g0_read,
+ .read_version = ucsi_stm32g0_read_version,
+ .read_cci = ucsi_stm32g0_read_cci,
+ .read_message_in = ucsi_stm32g0_read_message_in,
.sync_control = ucsi_stm32g0_sync_control,
.async_control = ucsi_stm32g0_async_control,
};

--
2.39.2

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