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USB: serial: mos7840: clean up device-type handling 

The current device-type detection is fragile and can't really be relied
upon. Instead of sprinkling device-id conditionals throughout the
driver, let's use the device-id table to encode the number of ports and
whether the device has a driver-controlled activity LED (MCS7810).

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2019-11-07 14:28:54 +01:00
parent 92fe35fb9c
commit 375cb533c0
1 changed files with 44 additions and 77 deletions
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121
drivers/usb/serial/mos7840.c
View File

@ -89,17 +89,10 @@
/* For higher baud Rates use TIOCEXBAUD */ /* For higher baud Rates use TIOCEXBAUD */
#define TIOCEXBAUD 0x5462 #define TIOCEXBAUD 0x5462
/* vendor id and device id defines */ /*
* Vendor id and device id defines
/* The native mos7840/7820 component */ *
#define USB_VENDOR_ID_MOSCHIP 0x9710 * NOTE: Do not add new defines, add entries directly to the id_table instead.
#define MOSCHIP_DEVICE_ID_7840 0x7840
#define MOSCHIP_DEVICE_ID_7843 0x7843
#define MOSCHIP_DEVICE_ID_7820 0x7820
#define MOSCHIP_DEVICE_ID_7810 0x7810
/* The native component can have its vendor/device id's overridden
* in vendor-specific implementations. Such devices can be handled
* by making a change here, in id_table.
*/ */
#define USB_VENDOR_ID_BANDB 0x0856 #define USB_VENDOR_ID_BANDB 0x0856
#define BANDB_DEVICE_ID_USO9ML2_2 0xAC22 #define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
@ -116,18 +109,6 @@
#define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03 #define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
#define BANDB_DEVICE_ID_USOPTL2_4 0xAC24 #define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
/* This driver also supports
* ATEN UC2324 device using Moschip MCS7840
* ATEN UC2322 device using Moschip MCS7820
* MOXA UPort 2210 device using Moschip MCS7820
*/
#define USB_VENDOR_ID_ATENINTL 0x0557
#define ATENINTL_DEVICE_ID_UC2324 0x2011
#define ATENINTL_DEVICE_ID_UC2322 0x7820
#define USB_VENDOR_ID_MOXA 0x110a
#define MOXA_DEVICE_ID_2210 0x2210
/* Interrupt Routine Defines */ /* Interrupt Routine Defines */
#define SERIAL_IIR_RLS 0x06 #define SERIAL_IIR_RLS 0x06
@ -179,27 +160,34 @@ enum mos7840_flag {
MOS7840_FLAG_LED_BUSY, MOS7840_FLAG_LED_BUSY,
}; };
#define MCS_PORT_MASK GENMASK(2, 0)
#define MCS_PORTS(nr) ((nr) & MCS_PORT_MASK)
#define MCS_LED BIT(3)
#define MCS_DEVICE(vid, pid, flags) \
USB_DEVICE((vid), (pid)), .driver_info = (flags)
static const struct usb_device_id id_table[] = { static const struct usb_device_id id_table[] = {
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)}, { MCS_DEVICE(0x0557, 0x2011, MCS_PORTS(4)) }, /* ATEN UC2324 */
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7843)}, { MCS_DEVICE(0x0557, 0x7820, MCS_PORTS(2)) }, /* ATEN UC2322 */
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)}, { MCS_DEVICE(0x110a, 0x2210, MCS_PORTS(2)) }, /* Moxa UPort 2210 */
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)}, { MCS_DEVICE(0x9710, 0x7810, MCS_PORTS(1) | MCS_LED) }, /* ASIX MCS7810 */
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)}, { MCS_DEVICE(0x9710, 0x7820, MCS_PORTS(2)) }, /* MosChip MCS7820 */
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)}, { MCS_DEVICE(0x9710, 0x7840, MCS_PORTS(4)) }, /* MosChip MCS7840 */
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)}, { MCS_DEVICE(0x9710, 0x7843, MCS_PORTS(3)) }, /* ASIX MCS7840 3 port */
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)}, { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2) },
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)}, { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P) },
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)}, { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4) },
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)}, { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P) },
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)}, { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2) },
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)}, { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4) },
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)}, { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2) },
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)}, { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4) },
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)}, { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2) },
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)}, { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P) },
{USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)}, { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4) },
{USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)}, { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P) },
{USB_DEVICE(USB_VENDOR_ID_MOXA, MOXA_DEVICE_ID_2210)}, { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4) },
{} /* terminating entry */ {} /* terminating entry */
}; };
MODULE_DEVICE_TABLE(usb, id_table); MODULE_DEVICE_TABLE(usb, id_table);
@ -2024,22 +2012,12 @@ static int mos7810_check(struct usb_serial *serial)
static int mos7840_probe(struct usb_serial *serial, static int mos7840_probe(struct usb_serial *serial,
const struct usb_device_id *id) const struct usb_device_id *id)
{ {
u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); unsigned long device_flags = id->driver_info;
u16 vid = le16_to_cpu(serial->dev->descriptor.idVendor);
u8 *buf; u8 *buf;
int device_type;
if (product == MOSCHIP_DEVICE_ID_7810 || /* Skip device-type detection if we already have device flags. */
product == MOSCHIP_DEVICE_ID_7820 || if (device_flags)
product == MOSCHIP_DEVICE_ID_7843) {
device_type = product;
goto out; goto out;
}
if (vid == USB_VENDOR_ID_MOXA && product == MOXA_DEVICE_ID_2210) {
device_type = MOSCHIP_DEVICE_ID_7820;
goto out;
}
buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL); buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
if (!buf) if (!buf)
@ -2051,15 +2029,15 @@ static int mos7840_probe(struct usb_serial *serial,
/* For a MCS7840 device GPIO0 must be set to 1 */ /* For a MCS7840 device GPIO0 must be set to 1 */
if (buf[0] & 0x01) if (buf[0] & 0x01)
device_type = MOSCHIP_DEVICE_ID_7840; device_flags = MCS_PORTS(4);
else if (mos7810_check(serial)) else if (mos7810_check(serial))
device_type = MOSCHIP_DEVICE_ID_7810; device_flags = MCS_PORTS(1) | MCS_LED;
else else
device_type = MOSCHIP_DEVICE_ID_7820; device_flags = MCS_PORTS(2);
kfree(buf); kfree(buf);
out: out:
usb_set_serial_data(serial, (void *)(unsigned long)device_type); usb_set_serial_data(serial, (void *)device_flags);
return 0; return 0;
} }
@ -2067,19 +2045,10 @@ out:
static int mos7840_calc_num_ports(struct usb_serial *serial, static int mos7840_calc_num_ports(struct usb_serial *serial,
struct usb_serial_endpoints *epds) struct usb_serial_endpoints *epds)
{ {
int device_type = (unsigned long)usb_get_serial_data(serial); unsigned long device_flags = (unsigned long)usb_get_serial_data(serial);
int num_ports; int num_ports = MCS_PORTS(device_flags);
if (device_type == MOSCHIP_DEVICE_ID_7843) if (num_ports == 0 || num_ports > 4)
num_ports = 3;
else
num_ports = (device_type >> 4) & 0x000F;
/*
* num_ports is currently never zero as device_type is one of
* MOSCHIP_DEVICE_ID_78{1,2,4}0.
*/
if (num_ports == 0)
return -ENODEV; return -ENODEV;
if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) { if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) {
@ -2093,7 +2062,7 @@ static int mos7840_calc_num_ports(struct usb_serial *serial,
static int mos7840_port_probe(struct usb_serial_port *port) static int mos7840_port_probe(struct usb_serial_port *port)
{ {
struct usb_serial *serial = port->serial; struct usb_serial *serial = port->serial;
int device_type = (unsigned long)usb_get_serial_data(serial); unsigned long device_flags = (unsigned long)usb_get_serial_data(serial);
struct moschip_port *mos7840_port; struct moschip_port *mos7840_port;
int status; int status;
int pnum; int pnum;
@ -2255,12 +2224,10 @@ static int mos7840_port_probe(struct usb_serial_port *port)
goto error; goto error;
} }
mos7840_port->has_led = false; mos7840_port->has_led = device_flags & MCS_LED;
/* Initialize LED timers */ /* Initialize LED timers */
if (device_type == MOSCHIP_DEVICE_ID_7810) { if (mos7840_port->has_led) {
mos7840_port->has_led = true;
mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL); mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr), mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
GFP_KERNEL); GFP_KERNEL);