usb: typec: ucsi: add ccg command framework

(quoted diff) +5 -0

+/* CCGx response codes */
+enum ccg_resp_code {
+	CMD_NO_RESP             = 0x00,
+	CMD_SUCCESS             = 0x02,
+	FLASH_DATA_AVAILABLE    = 0x03,

(quoted diff) +113 -9

+#define CCG_EVENT_MAX	(EVENT_INDEX + 43)
+
+struct ccg_cmd {
+	u16 reg;
+	u32 data;
+	int len;
+	int delay; /* ms delay for cmd timeout  */
+};
+
+struct ccg_resp {
+	u8 code;
+	u8 length;
+};
+
 struct ucsi_ccg {
 	struct device *dev;
 	struct ucsi *ucsi;

@@ -58,17 +111,14 @@ struct ucsi_ccg {
 	struct ccg_dev_info info;
 	/* version info for boot, primary and secondary */
 	struct version_info version[FW2 + 1];
+	/* CCG HPI communication flags */
+	unsigned long flags;
+#define RESET_PENDING	0
+#define DEV_CMD_PENDING	1
+	struct ccg_resp dev_resp;
+	u8 cmd_resp;
 };
 
-#define CCGX_RAB_DEVICE_MODE			0x0000
-#define CCGX_RAB_INTR_REG			0x0006
-#define CCGX_RAB_READ_ALL_VER			0x0010
-#define CCGX_RAB_READ_FW2_VER			0x0020
-#define CCGX_RAB_UCSI_CONTROL			0x0039
-#define CCGX_RAB_UCSI_CONTROL_START		BIT(0)
-#define CCGX_RAB_UCSI_CONTROL_STOP		BIT(1)
-#define CCGX_RAB_UCSI_DATA_BLOCK(offset)	(0xf000 | ((offset) & 0xff))
-
 static int ccg_read(struct ucsi_ccg *uc, u16 rab, u8 *data, u32 len)
 {
 	struct i2c_client *client = uc->client;

@@ -276,6 +326,110 @@ static int get_fw_info(struct ucsi_ccg *uc)
 	return 0;
 }
 
+static inline bool invalid_async_evt(int code)
+{
+	return (code >= CCG_EVENT_MAX) || (code < EVENT_INDEX);
+}
+
+static void ccg_process_response(struct ucsi_ccg *uc)
+{
+	struct device *dev = uc->dev;
+
+	if (uc->dev_resp.code & ASYNC_EVENT) {
+		if (uc->dev_resp.code == RESET_COMPLETE) {
+			if (test_bit(RESET_PENDING, &uc->flags))
+				uc->cmd_resp = uc->dev_resp.code;
+			get_fw_info(uc);
+		}
+		if (invalid_async_evt(uc->dev_resp.code))
+			dev_err(dev, "invalid async evt %d\n",
+				uc->dev_resp.code);
+	} else {
+		if (test_bit(DEV_CMD_PENDING, &uc->flags)) {
+			uc->cmd_resp = uc->dev_resp.code;
+			clear_bit(DEV_CMD_PENDING, &uc->flags);
+		} else {
+			dev_err(dev, "dev resp 0x%04x but no cmd pending\n",
+				uc->dev_resp.code);
+		}
+	}
+}
+
+static int ccg_read_response(struct ucsi_ccg *uc)
+{
+	unsigned long target = jiffies + msecs_to_jiffies(1000);
+	struct device *dev = uc->dev;
+	u8 intval;
+	int status;
+
+	/* wait for interrupt status to get updated */
+	do {
+		status = ccg_read(uc, CCGX_RAB_INTR_REG, &intval,
+				  sizeof(intval));
+		if (status < 0)
+			return status;
+
+		if (intval & DEV_INT)
+			break;
+		usleep_range(500, 600);
+	} while (time_is_after_jiffies(target));
+
+	if (time_is_before_jiffies(target)) {
+		dev_err(dev, "response timeout error\n");
+		return -ETIME;
+	}
+
+	status = ccg_read(uc, CCGX_RAB_RESPONSE, (u8 *)&uc->dev_resp,
+			  sizeof(uc->dev_resp));
+	if (status < 0)
+		return status;
+
+	status = ccg_write(uc, CCGX_RAB_INTR_REG, &intval, sizeof(intval));
+	if (status < 0)
+		return status;
+
+	return 0;
+}
+
+/* Caller must hold uc->lock */
+static int ccg_send_command(struct ucsi_ccg *uc, struct ccg_cmd *cmd)
+{
+	struct device *dev = uc->dev;
+	int ret;
+
+	switch (cmd->reg & 0xF000) {
+	case DEV_REG_IDX:
+		set_bit(DEV_CMD_PENDING, &uc->flags);
+		break;
+	default:
+		dev_err(dev, "invalid cmd register\n");
+		break;
+	}
+
+	ret = ccg_write(uc, cmd->reg, (u8 *)&cmd->data, cmd->len);
+	if (ret < 0)
+		return ret;
+
+	msleep(cmd->delay);
+
+	ret = ccg_read_response(uc);
+	if (ret < 0) {
+		dev_err(dev, "response read error\n");
+		switch (cmd->reg & 0xF000) {
+		case DEV_REG_IDX:
+			clear_bit(DEV_CMD_PENDING, &uc->flags);
+			break;