[PATCH 2/9] media: cros-ec-cec: Manage an array of ports

From: Reka Norman
Date: Mon Aug 14 2023 - 00:36:10 EST

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To support multiple CEC ports, change cros_ec_cec to contain an array of
ports, each with their own CEC adapter, etc.

For now, only create a single port and use that port everywhere, so
there is no functional change. Support for multiple ports will be added
in the following patches.

Signed-off-by: Reka Norman <rekanorman@xxxxxxxxxxxx>
---

.../media/cec/platform/cros-ec/cros-ec-cec.c | 147 +++++++++++++-----
.../linux/platform_data/cros_ec_commands.h | 2 +
2 files changed, 110 insertions(+), 39 deletions(-)

diff --git a/drivers/media/cec/platform/cros-ec/cros-ec-cec.c b/drivers/media/cec/platform/cros-ec/cros-ec-cec.c
index 8dd95fb38546..d76a25ae0cf1 100644
--- a/drivers/media/cec/platform/cros-ec/cros-ec-cec.c
+++ b/drivers/media/cec/platform/cros-ec/cros-ec-cec.c
@@ -21,21 +21,40 @@

#define DRV_NAME "cros-ec-cec"

+/* Only one port is supported for now */
+#define CEC_NUM_PORTS 1
+#define CEC_PORT 0
+
/**
- * struct cros_ec_cec - Driver data for EC CEC
+ * struct cros_ec_cec_port - Driver data for a single EC CEC port
*
- * @cros_ec: Pointer to EC device
- * @notifier: Notifier info for responding to EC events
+ * @port_num: port number
* @adap: CEC adapter
* @notify: CEC notifier pointer
* @rx_msg: storage for a received message
+ * @cros_ec_cec: pointer to the parent struct
*/
-struct cros_ec_cec {
- struct cros_ec_device *cros_ec;
- struct notifier_block notifier;
+struct cros_ec_cec_port {
+ int port_num;
struct cec_adapter *adap;
struct cec_notifier *notify;
struct cec_msg rx_msg;
+ struct cros_ec_cec *cros_ec_cec;
+};
+
+/**
+ * struct cros_ec_cec - Driver data for EC CEC
+ *
+ * @cros_ec: Pointer to EC device
+ * @notifier: Notifier info for responding to EC events
+ * @num_ports: Number of CEC ports
+ * @ports: Array of ports
+ */
+struct cros_ec_cec {
+ struct cros_ec_device *cros_ec;
+ struct notifier_block notifier;
+ int num_ports;
+ struct cros_ec_cec_port *ports[EC_CEC_MAX_PORTS];
};

static void handle_cec_message(struct cros_ec_cec *cros_ec_cec)
@@ -43,27 +62,28 @@ static void handle_cec_message(struct cros_ec_cec *cros_ec_cec)
struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
uint8_t *cec_message = cros_ec->event_data.data.cec_message;
unsigned int len = cros_ec->event_size;
+ struct cros_ec_cec_port *port = cros_ec_cec->ports[CEC_PORT];

if (len > CEC_MAX_MSG_SIZE)
len = CEC_MAX_MSG_SIZE;
- cros_ec_cec->rx_msg.len = len;
- memcpy(cros_ec_cec->rx_msg.msg, cec_message, len);
+ port->rx_msg.len = len;
+ memcpy(port->rx_msg.msg, cec_message, len);

- cec_received_msg(cros_ec_cec->adap, &cros_ec_cec->rx_msg);
+ cec_received_msg(port->adap, &port->rx_msg);
}

static void handle_cec_event(struct cros_ec_cec *cros_ec_cec)
{
struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
uint32_t events = cros_ec->event_data.data.cec_events;
+ struct cros_ec_cec_port *port = cros_ec_cec->ports[CEC_PORT];

if (events & EC_MKBP_CEC_SEND_OK)
- cec_transmit_attempt_done(cros_ec_cec->adap,
- CEC_TX_STATUS_OK);
+ cec_transmit_attempt_done(port->adap, CEC_TX_STATUS_OK);

/* FW takes care of all retries, tell core to avoid more retries */
if (events & EC_MKBP_CEC_SEND_FAILED)
- cec_transmit_attempt_done(cros_ec_cec->adap,
+ cec_transmit_attempt_done(port->adap,
CEC_TX_STATUS_MAX_RETRIES |
CEC_TX_STATUS_NACK);
}
@@ -93,7 +113,8 @@ static int cros_ec_cec_event(struct notifier_block *nb,

static int cros_ec_cec_set_log_addr(struct cec_adapter *adap, u8 logical_addr)
{
- struct cros_ec_cec *cros_ec_cec = adap->priv;
+ struct cros_ec_cec_port *port = adap->priv;
+ struct cros_ec_cec *cros_ec_cec = port->cros_ec_cec;
struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
struct ec_params_cec_set params = {
.cmd = CEC_CMD_LOGICAL_ADDRESS,
@@ -115,7 +136,8 @@ static int cros_ec_cec_set_log_addr(struct cec_adapter *adap, u8 logical_addr)
static int cros_ec_cec_transmit(struct cec_adapter *adap, u8 attempts,
u32 signal_free_time, struct cec_msg *cec_msg)
{
- struct cros_ec_cec *cros_ec_cec = adap->priv;
+ struct cros_ec_cec_port *port = adap->priv;
+ struct cros_ec_cec *cros_ec_cec = port->cros_ec_cec;
struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
struct ec_params_cec_write params;
int ret;
@@ -135,7 +157,8 @@ static int cros_ec_cec_transmit(struct cec_adapter *adap, u8 attempts,

static int cros_ec_cec_adap_enable(struct cec_adapter *adap, bool enable)
{
- struct cros_ec_cec *cros_ec_cec = adap->priv;
+ struct cros_ec_cec_port *port = adap->priv;
+ struct cros_ec_cec *cros_ec_cec = port->cros_ec_cec;
struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
struct ec_params_cec_set params = {
.cmd = CEC_CMD_ENABLE,
@@ -260,11 +283,55 @@ static struct device *cros_ec_cec_find_hdmi_dev(struct device *dev,

#endif

+static int cros_ec_cec_init_port(struct device *dev,
+ struct cros_ec_cec *cros_ec_cec,
+ int port_num, struct device *hdmi_dev,
+ const char *conn)
+{
+ struct cros_ec_cec_port *port;
+ int ret;
+
+ port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
+ if (!port)
+ return -ENOMEM;
+
+ port->cros_ec_cec = cros_ec_cec;
+ port->port_num = port_num;
+
+ port->adap = cec_allocate_adapter(&cros_ec_cec_ops, port, DRV_NAME,
+ CEC_CAP_DEFAULTS |
+ CEC_CAP_CONNECTOR_INFO, 1);
+ if (IS_ERR(port->adap))
+ return PTR_ERR(port->adap);
+
+ port->notify = cec_notifier_cec_adap_register(hdmi_dev, conn,
+ port->adap);
+ if (!port->notify) {
+ ret = -ENOMEM;
+ goto out_probe_adapter;
+ }
+
+ ret = cec_register_adapter(port->adap, dev);
+ if (ret < 0)
+ goto out_probe_notify;
+
+ cros_ec_cec->ports[port_num] = port;
+
+ return 0;
+
+out_probe_notify:
+ cec_notifier_cec_adap_unregister(port->notify, port->adap);
+out_probe_adapter:
+ cec_delete_adapter(port->adap);
+ return ret;
+}
+
static int cros_ec_cec_probe(struct platform_device *pdev)
{
struct cros_ec_dev *ec_dev = dev_get_drvdata(pdev->dev.parent);
struct cros_ec_device *cros_ec = ec_dev->ec_dev;
struct cros_ec_cec *cros_ec_cec;
+ struct cros_ec_cec_port *port;
struct device *hdmi_dev;
const char *conn = NULL;
int ret;
@@ -283,18 +350,13 @@ static int cros_ec_cec_probe(struct platform_device *pdev)

device_init_wakeup(&pdev->dev, 1);

- cros_ec_cec->adap = cec_allocate_adapter(&cros_ec_cec_ops, cros_ec_cec,
- DRV_NAME,
- CEC_CAP_DEFAULTS |
- CEC_CAP_CONNECTOR_INFO, 1);
- if (IS_ERR(cros_ec_cec->adap))
- return PTR_ERR(cros_ec_cec->adap);
+ cros_ec_cec->num_ports = CEC_NUM_PORTS;

- cros_ec_cec->notify = cec_notifier_cec_adap_register(hdmi_dev, conn,
- cros_ec_cec->adap);
- if (!cros_ec_cec->notify) {
- ret = -ENOMEM;
- goto out_probe_adapter;
+ for (int i = 0; i < cros_ec_cec->num_ports; i++) {
+ ret = cros_ec_cec_init_port(&pdev->dev, cros_ec_cec, i,
+ hdmi_dev, conn);
+ if (ret)
+ goto unregister_ports;
}

/* Get CEC events from the EC. */
@@ -303,20 +365,24 @@ static int cros_ec_cec_probe(struct platform_device *pdev)
&cros_ec_cec->notifier);
if (ret) {
dev_err(&pdev->dev, "failed to register notifier\n");
- goto out_probe_notify;
+ goto unregister_ports;
}

- ret = cec_register_adapter(cros_ec_cec->adap, &pdev->dev);
- if (ret < 0)
- goto out_probe_notify;
-
return 0;

-out_probe_notify:
- cec_notifier_cec_adap_unregister(cros_ec_cec->notify,
- cros_ec_cec->adap);
-out_probe_adapter:
- cec_delete_adapter(cros_ec_cec->adap);
+unregister_ports:
+ /*
+ * Unregister any adapters which have been registered. We don't add the
+ * port to the array until the adapter has been registered successfully,
+ * so any non-NULL ports must have been registered.
+ */
+ for (int i = 0; i < cros_ec_cec->num_ports; i++) {
+ port = cros_ec_cec->ports[i];
+ if (!port)
+ break;
+ cec_notifier_cec_adap_unregister(port->notify, port->adap);
+ cec_unregister_adapter(port->adap);
+ }
return ret;
}

@@ -324,6 +390,7 @@ static void cros_ec_cec_remove(struct platform_device *pdev)
{
struct cros_ec_cec *cros_ec_cec = platform_get_drvdata(pdev);
struct device *dev = &pdev->dev;
+ struct cros_ec_cec_port *port;
int ret;

/*
@@ -337,9 +404,11 @@ static void cros_ec_cec_remove(struct platform_device *pdev)
if (ret)
dev_err(dev, "failed to unregister notifier\n");

- cec_notifier_cec_adap_unregister(cros_ec_cec->notify,
- cros_ec_cec->adap);
- cec_unregister_adapter(cros_ec_cec->adap);
+ for (int i = 0; i < cros_ec_cec->num_ports; i++) {
+ port = cros_ec_cec->ports[i];
+ cec_notifier_cec_adap_unregister(port->notify, port->adap);
+ cec_unregister_adapter(port->adap);
+ }
}

static struct platform_driver cros_ec_cec_driver = {
diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h
index ab721cf13a98..cb2ddd10a613 100644
--- a/include/linux/platform_data/cros_ec_commands.h
+++ b/include/linux/platform_data/cros_ec_commands.h
@@ -4436,6 +4436,8 @@ struct ec_response_i2c_passthru_protect {
* These commands are for sending and receiving message via HDMI CEC
*/

+#define EC_CEC_MAX_PORTS 16
+
#define MAX_CEC_MSG_LEN 16

/* CEC message from the AP to be written on the CEC bus */
--
2.41.0.640.ga95def55d0-goog

Next message: Reka Norman: "[PATCH 3/9] media: cros-ec-cec: Support multiple ports in set/get host commands"
Previous message: Reka Norman: "[PATCH 1/9] media: cros-ec-cec: Use cros_ec_cmd to send host commands"
In reply to: Reka Norman: "[PATCH 1/9] media: cros-ec-cec: Use cros_ec_cmd to send host commands"
Next in thread: Reka Norman: "[PATCH 3/9] media: cros-ec-cec: Support multiple ports in set/get host commands"
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