Staging: poch: Parameter to enable loopback (dad17401) · Commits · 戴 / test

drivers/staging/poch/poch.c

+13 −3

Original line number	Diff line number	Diff line
		@@ -252,6 +252,11 @@ module_param(synth_rx, bool, 0600);
		MODULE_PARM_DESC(synth_rx,
		"Synthesize received values using a counter. Default: No");

		static int loopback;
		module_param(loopback, bool, 0600);
		MODULE_PARM_DESC(loopback,
		"Enable hardware loopback of trasnmitted data. Default: No");

		static dev_t poch_first_dev;
		static struct class *poch_cls;
		static DEFINE_IDR(poch_ids);
		@@ -830,9 +835,14 @@ static int poch_open(struct inode inode, struct file filp)

		if (channel->dir == CHANNEL_DIR_TX) {
		/* Flush TX FIFO and output data from cardbus. */
		iowrite32(FPGA_TX_CTL_FIFO_FLUSH
		\| FPGA_TX_CTL_OUTPUT_CARDBUS,
		fpga + FPGA_TX_CTL_REG);
		u32 ctl_val = 0;

		ctl_val \|= FPGA_TX_CTL_FIFO_FLUSH;
		ctl_val \|= FPGA_TX_CTL_OUTPUT_CARDBUS;
		if (loopback)
		ctl_val \|= FPGA_TX_CTL_LOOPBACK;

		iowrite32(ctl_val, fpga + FPGA_TX_CTL_REG);
		} else {
		/* Flush RX FIFO and output data to cardbus. */
		u32 ctl_val = FPGA_RX_CTL_CONT_CAP \| FPGA_RX_CTL_FIFO_FLUSH;