Make use of existing kernel macros: - Use the unit suffixes from linux/units.h for the controller clock frequencies - Use the BIT() and the GENMASK() macro to set specific bits in some constants - Use CAN_MAX_DLEN (instead of directly using the value 8) for the maximum CAN payload length Additionally: - Spend some commenting for the previously changed constants - Add the current year to the copyright notice - While adding the header linux/units.h to the list of include files also sort that list alphabetically Suggested-by: Vincent MAILHOL <mailhol.vincent@xxxxxxxxxx> Link: https://lore.kernel.org/all/CAMZ6RqLaDNy-fZ2G0+QMhUEckkXLL+ZyELVSDFmqpd++aBzZQg@xxxxxxxxxxxxxx/ Link: https://lore.kernel.org/all/CAMZ6RqKdg5YBufa0C+ttzJvoG=9yuti-8AmthCi4jBbd08JEtw@xxxxxxxxxxxxxx/ Suggested-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> Link: https://lore.kernel.org/all/20230518-grower-film-ea8b5f853f3e-mkl@xxxxxxxxxxxxxx/ Signed-off-by: Frank Jungclaus <frank.jungclaus@xxxxxx> --- drivers/net/can/usb/esd_usb.c | 40 ++++++++++++++++++----------------- 1 file changed, 21 insertions(+), 19 deletions(-) diff --git a/drivers/net/can/usb/esd_usb.c b/drivers/net/can/usb/esd_usb.c index d33bac3a6c10..32354cfdf151 100644 --- a/drivers/net/can/usb/esd_usb.c +++ b/drivers/net/can/usb/esd_usb.c @@ -3,19 +3,20 @@ * CAN driver for esd electronics gmbh CAN-USB/2 and CAN-USB/Micro * * Copyright (C) 2010-2012 esd electronic system design gmbh, Matthias Fuchs <socketcan@xxxxxx> - * Copyright (C) 2022 esd electronics gmbh, Frank Jungclaus <frank.jungclaus@xxxxxx> + * Copyright (C) 2022-2023 esd electronics gmbh, Frank Jungclaus <frank.jungclaus@xxxxxx> */ +#include <linux/can.h> +#include <linux/can/dev.h> +#include <linux/can/error.h> + #include <linux/ethtool.h> -#include <linux/signal.h> -#include <linux/slab.h> #include <linux/module.h> #include <linux/netdevice.h> +#include <linux/signal.h> +#include <linux/slab.h> +#include <linux/units.h> #include <linux/usb.h> -#include <linux/can.h> -#include <linux/can/dev.h> -#include <linux/can/error.h> - MODULE_AUTHOR("Matthias Fuchs <socketcan@xxxxxx>"); MODULE_AUTHOR("Frank Jungclaus <frank.jungclaus@xxxxxx>"); MODULE_DESCRIPTION("CAN driver for esd electronics gmbh CAN-USB/2 and CAN-USB/Micro interfaces"); @@ -27,8 +28,8 @@ MODULE_LICENSE("GPL v2"); #define USB_CANUSBM_PRODUCT_ID 0x0011 /* CAN controller clock frequencies */ -#define ESD_USB2_CAN_CLOCK 60000000 -#define ESD_USBM_CAN_CLOCK 36000000 +#define ESD_USB2_CAN_CLOCK (60 * MEGA) /* Hz */ +#define ESD_USBM_CAN_CLOCK (36 * MEGA) /* Hz */ /* Maximum number of CAN nets */ #define ESD_USB_MAX_NETS 2 @@ -42,20 +43,21 @@ MODULE_LICENSE("GPL v2"); #define CMD_IDADD 6 /* also used for IDADD_REPLY */ /* esd CAN message flags - dlc field */ -#define ESD_RTR 0x10 +#define ESD_RTR BIT(4) + /* esd CAN message flags - id field */ -#define ESD_EXTID 0x20000000 -#define ESD_EVENT 0x40000000 -#define ESD_IDMASK 0x1fffffff +#define ESD_EXTID BIT(29) +#define ESD_EVENT BIT(30) +#define ESD_IDMASK GENMASK(28, 0) /* esd CAN event ids */ #define ESD_EV_CAN_ERROR_EXT 2 /* CAN controller specific diagnostic data */ /* baudrate message flags */ -#define ESD_USB_UBR 0x80000000 -#define ESD_USB_LOM 0x40000000 -#define ESD_USB_NO_BAUDRATE 0x7fffffff +#define ESD_USB_LOM BIT(30) /* 0x40000000, Listen Only Mode */ +#define ESD_USB_UBR BIT(31) /* 0x80000000, User Bit Rate (controller BTR) in bits 0..27 */ +#define ESD_USB_NO_BAUDRATE GENMASK(30, 0) /* bit rate unconfigured */ /* bit timing CAN-USB/2 */ #define ESD_USB2_TSEG1_MIN 1 @@ -70,7 +72,7 @@ MODULE_LICENSE("GPL v2"); #define ESD_USB2_BRP_MIN 1 #define ESD_USB2_BRP_MAX 1024 #define ESD_USB2_BRP_INC 1 -#define ESD_USB2_3_SAMPLES 0x00800000 +#define ESD_USB2_3_SAMPLES BIT(23) /* esd IDADD message */ #define ESD_ID_ENABLE 0x80 @@ -128,7 +130,7 @@ struct rx_msg { __le32 ts; __le32 id; /* upper 3 bits contain flags */ union { - u8 data[8]; + u8 data[CAN_MAX_DLEN]; struct { u8 status; /* CAN Controller Status */ u8 ecc; /* Error Capture Register */ @@ -145,7 +147,7 @@ struct tx_msg { u8 dlc; u32 hnd; /* opaque handle, not used by device */ __le32 id; /* upper 3 bits contain flags */ - u8 data[8]; + u8 data[CAN_MAX_DLEN]; }; struct tx_done_msg { -- 2.25.1
