netdev - [PATCH v3 01/10] can: kvaser_pciefd: Add support to control CAN LEDs on device

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Message-ID: <20250724073021.8-2-extja@kvaser.com>
Date: Thu, 24 Jul 2025 09:30:12 +0200
From: Jimmy Assarsson <extja@...ser.com>
To: linux-can@...r.kernel.org
Cc: Jimmy Assarsson <jimmyassarsson@...il.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	netdev@...r.kernel.org
Subject: [PATCH v3 01/10] can: kvaser_pciefd: Add support to control CAN LEDs on device

Add support to turn on/off CAN LEDs on device.
Turn off all CAN LEDs in probe, since they are default on after a reset or
power on.

Reviewed-by: Axel Forsman <axfo@...ser.com>
Signed-off-by: Jimmy Assarsson <extja@...ser.com>
---
 drivers/net/can/kvaser_pciefd.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/net/can/kvaser_pciefd.c b/drivers/net/can/kvaser_pciefd.c
index 09510663988c..c8f530ef416e 100644
--- a/drivers/net/can/kvaser_pciefd.c
+++ b/drivers/net/can/kvaser_pciefd.c
@@ -66,6 +66,7 @@ MODULE_DESCRIPTION("CAN driver for Kvaser CAN/PCIe devices");
 #define KVASER_PCIEFD_KCAN_FIFO_LAST_REG 0x180
 #define KVASER_PCIEFD_KCAN_CTRL_REG 0x2c0
 #define KVASER_PCIEFD_KCAN_CMD_REG 0x400
+#define KVASER_PCIEFD_KCAN_IOC_REG 0x404
 #define KVASER_PCIEFD_KCAN_IEN_REG 0x408
 #define KVASER_PCIEFD_KCAN_IRQ_REG 0x410
 #define KVASER_PCIEFD_KCAN_TX_NR_PACKETS_REG 0x414
@@ -136,6 +137,9 @@ MODULE_DESCRIPTION("CAN driver for Kvaser CAN/PCIe devices");
 /* Request status packet */
 #define KVASER_PCIEFD_KCAN_CMD_SRQ BIT(0)
 
+/* Control CAN LED, active low */
+#define KVASER_PCIEFD_KCAN_IOC_LED BIT(0)
+
 /* Transmitter unaligned */
 #define KVASER_PCIEFD_KCAN_IRQ_TAL BIT(17)
 /* Tx FIFO empty */
@@ -410,6 +414,7 @@ struct kvaser_pciefd_can {
 	struct kvaser_pciefd *kv_pcie;
 	void __iomem *reg_base;
 	struct can_berr_counter bec;
+	u32 ioc;
 	u8 cmd_seq;
 	u8 tx_max_count;
 	u8 tx_idx;
@@ -528,6 +533,16 @@ static inline void kvaser_pciefd_abort_flush_reset(struct kvaser_pciefd_can *can
 	kvaser_pciefd_send_kcan_cmd(can, KVASER_PCIEFD_KCAN_CMD_AT);
 }
 
+static inline void kvaser_pciefd_set_led(struct kvaser_pciefd_can *can, bool on)
+{
+	if (on)
+		can->ioc &= ~KVASER_PCIEFD_KCAN_IOC_LED;
+	else
+		can->ioc |= KVASER_PCIEFD_KCAN_IOC_LED;
+
+	iowrite32(can->ioc, can->reg_base + KVASER_PCIEFD_KCAN_IOC_REG);
+}
+
 static void kvaser_pciefd_enable_err_gen(struct kvaser_pciefd_can *can)
 {
 	u32 mode;
@@ -990,6 +1005,9 @@ static int kvaser_pciefd_setup_can_ctrls(struct kvaser_pciefd *pcie)
 		/* Disable Bus load reporting */
 		iowrite32(0, can->reg_base + KVASER_PCIEFD_KCAN_BUS_LOAD_REG);
 
+		can->ioc = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_IOC_REG);
+		kvaser_pciefd_set_led(can, false);
+
 		tx_nr_packets_max =
 			FIELD_GET(KVASER_PCIEFD_KCAN_TX_NR_PACKETS_MAX_MASK,
 				  ioread32(can->reg_base + KVASER_PCIEFD_KCAN_TX_NR_PACKETS_REG));
-- 
2.49.0