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Subject[PATCH V5 1/1] USB: serial: f81232: Add generator for F81534A
Date
The Fintek F81534A series is contains 1 HUB / 1 GPIO device / n UARTs,
but the UART is default disable and need enabled by GPIO device(2c42/16F8).

When F81534A plug to host, we can only see 1 HUB & 1 GPIO device and we
write 0x8fff to GPIO device register F81534A_CTRL_CMD_ENABLE_PORT(116h)
to enable all available serial ports.

Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
---
Changelog:
v5:
1. Fix error handling in f81534a_ctrl_set_register().
2. Change some output message from dev->dev to intf->dev.

v4:
1. Remove unused define.
2. Remove usb_translate_errors() in f81534a_ctrl_set_register()
with short transfer.
3. Replace dev_warn() with dev_err() in f81534a_ctrl_enable_all_ports()
4. Disable & remove all usb serial port device when disconnect().

v3:
1. Modify some define with prefix F81534A_CTRL_.
2. Use kmemdup() in f81534a_ctrl_set_register().
3. Not accpet with short transfers in f81534a_ctrl_set_register().
4. Add comment in f81534a_ctrl_enable_all_ports() to describe magic
constants.
5. Remove non-need usb_get_dev()/usb_put_dev().
6. Add F81534A_CTRL_ID in MODULE_DEVICE_TABLE().

v2:
1: Simplify the generator behavior.
2: Change multiply MODULE_DEVICE_TABLE() to 1 only.

drivers/usb/serial/f81232.c | 135 +++++++++++++++++++++++++++++++++++-
1 file changed, 134 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index d27876e64e9d..e2a7b65218bb 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -36,6 +36,9 @@
{ USB_DEVICE(0x2c42, 0x1635) }, /* 8 port UART device */ \
{ USB_DEVICE(0x2c42, 0x1636) } /* 12 port UART device */

+#define F81534A_CTRL_ID \
+ { USB_DEVICE(0x2c42, 0x16f8) } /* Global control device */
+
static const struct usb_device_id f81232_id_table[] = {
F81232_ID,
{ } /* Terminating entry */
@@ -46,9 +49,15 @@ static const struct usb_device_id f81534a_id_table[] = {
{ } /* Terminating entry */
};

+static const struct usb_device_id f81534a_ctrl_id_table[] = {
+ F81534A_CTRL_ID,
+ { } /* Terminating entry */
+};
+
static const struct usb_device_id combined_id_table[] = {
F81232_ID,
F81534A_SERIES_ID,
+ F81534A_CTRL_ID,
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, combined_id_table);
@@ -61,6 +70,7 @@ MODULE_DEVICE_TABLE(usb, combined_id_table);
#define F81232_REGISTER_REQUEST 0xa0
#define F81232_GET_REGISTER 0xc0
#define F81232_SET_REGISTER 0x40
+#define F81534A_ACCESS_REG_RETRY 2

#define SERIAL_BASE_ADDRESS 0x0120
#define RECEIVE_BUFFER_REGISTER (0x00 + SERIAL_BASE_ADDRESS)
@@ -101,6 +111,8 @@ MODULE_DEVICE_TABLE(usb, combined_id_table);
#define F81534A_GPIO_MODE1_OUTPUT BIT(1)
#define F81534A_GPIO_MODE0_OUTPUT BIT(0)

+#define F81534A_CTRL_CMD_ENABLE_PORT 0x116
+
struct f81232_private {
struct mutex lock;
u8 modem_control;
@@ -848,6 +860,93 @@ static void f81232_lsr_worker(struct work_struct *work)
dev_warn(&port->dev, "read LSR failed: %d\n", status);
}

+static int f81534a_ctrl_set_register(struct usb_interface *intf, u16 reg,
+ u16 size, void *val)
+{
+ struct usb_device *dev = interface_to_usbdev(intf);
+ int retry = F81534A_ACCESS_REG_RETRY;
+ int status;
+ u8 *tmp;
+
+ tmp = kmemdup(val, size, GFP_KERNEL);
+ if (!tmp)
+ return -ENOMEM;
+
+ while (retry--) {
+ status = usb_control_msg(dev,
+ usb_sndctrlpipe(dev, 0),
+ F81232_REGISTER_REQUEST,
+ F81232_SET_REGISTER,
+ reg,
+ 0,
+ tmp,
+ size,
+ USB_CTRL_SET_TIMEOUT);
+ if (status < 0) {
+ status = usb_translate_errors(status);
+ if (status == -EIO)
+ continue;
+ } else if (status != size) {
+ /* Retry on short transfers */
+ status = -EIO;
+ continue;
+ } else {
+ status = 0;
+ }
+
+ break;
+ }
+
+ if (status) {
+ dev_err(&intf->dev, "set ctrl reg: %x, failed status: %d\n",
+ reg, status);
+ }
+
+ kfree(tmp);
+ return status;
+}
+
+static int f81534a_ctrl_enable_all_ports(struct usb_interface *intf, bool en)
+{
+ unsigned char enable[2] = {0};
+ int status;
+
+ /*
+ * Enable all available serial ports, define as following:
+ * bit 15 : Reset behavior (when HUB got soft reset)
+ * 0: maintain all serial port enabled state.
+ * 1: disable all serial port.
+ * bit 0~11 : Serial port enable bit.
+ */
+ if (en) {
+ enable[0] = 0xff;
+ enable[1] = 0x8f;
+ }
+
+ status = f81534a_ctrl_set_register(intf, F81534A_CTRL_CMD_ENABLE_PORT,
+ sizeof(enable), enable);
+ if (status)
+ dev_err(&intf->dev, "failed to enable ports: %d\n", status);
+
+ return status;
+}
+
+static int f81534a_ctrl_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+ return f81534a_ctrl_enable_all_ports(intf, true);
+}
+
+static void f81534a_ctrl_disconnect(struct usb_interface *intf)
+{
+ f81534a_ctrl_enable_all_ports(intf, false);
+}
+
+static int f81534a_ctrl_resume(struct usb_interface *intf)
+{
+ return f81534a_ctrl_enable_all_ports(intf, true);
+}
+
static int f81232_port_probe(struct usb_serial_port *port)
{
struct f81232_private *priv;
@@ -975,7 +1074,41 @@ static struct usb_serial_driver * const serial_drivers[] = {
NULL,
};

-module_usb_serial_driver(serial_drivers, combined_id_table);
+static struct usb_driver f81534a_ctrl_driver = {
+ .name = "f81534a_ctrl",
+ .id_table = f81534a_ctrl_id_table,
+ .probe = f81534a_ctrl_probe,
+ .disconnect = f81534a_ctrl_disconnect,
+ .resume = f81534a_ctrl_resume,
+};
+
+static int __init f81232_init(void)
+{
+ int status;
+
+ status = usb_register_driver(&f81534a_ctrl_driver, THIS_MODULE,
+ KBUILD_MODNAME);
+ if (status)
+ return status;
+
+ status = usb_serial_register_drivers(serial_drivers, KBUILD_MODNAME,
+ combined_id_table);
+ if (status) {
+ usb_deregister(&f81534a_ctrl_driver);
+ return status;
+ }
+
+ return 0;
+}
+
+static void __exit f81232_exit(void)
+{
+ usb_serial_deregister_drivers(serial_drivers);
+ usb_deregister(&f81534a_ctrl_driver);
+}
+
+module_init(f81232_init);
+module_exit(f81232_exit);

MODULE_DESCRIPTION("Fintek F81232/532A/534A/535/536 USB to serial driver");
MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
--
2.17.1
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