#include <linux/usb.h>
#include <linux/uaccess.h>
#include <linux/usb/serial.h>
+#include <linux/gpio/driver.h>
+#include <linux/bitops.h>
+#include <linux/mutex.h>
#define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
static int cp210x_tiocmset_port(struct usb_serial_port *port,
unsigned int, unsigned int);
static void cp210x_break_ctl(struct tty_struct *, int);
+static int cp210x_attach(struct usb_serial *);
+static void cp210x_disconnect(struct usb_serial *);
+static void cp210x_release(struct usb_serial *);
static int cp210x_port_probe(struct usb_serial_port *);
static int cp210x_port_remove(struct usb_serial_port *);
static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
MODULE_DEVICE_TABLE(usb, id_table);
+struct cp210x_serial_private {
+#ifdef CONFIG_GPIOLIB
+ struct gpio_chip gc;
+ u8 config;
+ u8 gpio_mode;
+ u8 gpio_registered;
+#endif
+ u8 partnum;
+};
+
struct cp210x_port_private {
__u8 bInterfaceNumber;
bool has_swapped_line_ctl;
.tx_empty = cp210x_tx_empty,
.tiocmget = cp210x_tiocmget,
.tiocmset = cp210x_tiocmset,
+ .attach = cp210x_attach,
+ .disconnect = cp210x_disconnect,
+ .release = cp210x_release,
.port_probe = cp210x_port_probe,
.port_remove = cp210x_port_remove,
.dtr_rts = cp210x_dtr_rts
#define CP210X_SET_CHARS 0x19
#define CP210X_GET_BAUDRATE 0x1D
#define CP210X_SET_BAUDRATE 0x1E
+#define CP210X_VENDOR_SPECIFIC 0xFF
/* CP210X_IFC_ENABLE */
#define UART_ENABLE 0x0001
#define CONTROL_WRITE_DTR 0x0100
#define CONTROL_WRITE_RTS 0x0200
+/* CP210X_VENDOR_SPECIFIC values */
+#define CP210X_READ_LATCH 0x00C2
+#define CP210X_GET_PARTNUM 0x370B
+#define CP210X_GET_PORTCONFIG 0x370C
+#define CP210X_GET_DEVICEMODE 0x3711
+#define CP210X_WRITE_LATCH 0x37E1
+
+/* Part number definitions */
+#define CP210X_PARTNUM_CP2101 0x01
+#define CP210X_PARTNUM_CP2102 0x02
+#define CP210X_PARTNUM_CP2103 0x03
+#define CP210X_PARTNUM_CP2104 0x04
+#define CP210X_PARTNUM_CP2105 0x05
+#define CP210X_PARTNUM_CP2108 0x08
+
/* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
struct cp210x_comm_status {
__le32 ulErrors;
#define CP210X_SERIAL_RTS_ACTIVE 1
#define CP210X_SERIAL_RTS_FLOW_CTL 2
+/* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
+struct cp210x_pin_mode {
+ u8 eci;
+ u8 sci;
+} __packed;
+
+#define CP210X_PIN_MODE_MODEM 0
+#define CP210X_PIN_MODE_GPIO BIT(0)
+
+/*
+ * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes.
+ * Structure needs padding due to unused/unspecified bytes.
+ */
+struct cp210x_config {
+ __le16 gpio_mode;
+ u8 __pad0[2];
+ __le16 reset_state;
+ u8 __pad1[4];
+ __le16 suspend_state;
+ u8 sci_cfg;
+ u8 eci_cfg;
+ u8 device_cfg;
+} __packed;
+
+/* GPIO modes */
+#define CP210X_SCI_GPIO_MODE_OFFSET 9
+#define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9)
+
+#define CP210X_ECI_GPIO_MODE_OFFSET 2
+#define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2)
+
+/* CP2105 port configuration values */
+#define CP2105_GPIO0_TXLED_MODE BIT(0)
+#define CP2105_GPIO1_RXLED_MODE BIT(1)
+#define CP2105_GPIO1_RS485_MODE BIT(2)
+
+/* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
+struct cp210x_gpio_write {
+ u8 mask;
+ u8 state;
+} __packed;
+
+/*
+ * Helper to get interface number when we only have struct usb_serial.
+ */
+static u8 cp210x_interface_num(struct usb_serial *serial)
+{
+ struct usb_host_interface *cur_altsetting;
+
+ cur_altsetting = serial->interface->cur_altsetting;
+
+ return cur_altsetting->desc.bInterfaceNumber;
+}
+
/*
* Reads a variable-sized block of CP210X_ registers, identified by req.
* Returns data into buf in native USB byte order.
return cp210x_read_reg_block(port, req, val, sizeof(*val));
}
+/*
+ * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
+ * Returns data into buf in native USB byte order.
+ */
+static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
+ void *buf, int bufsize)
+{
+ void *dmabuf;
+ int result;
+
+ dmabuf = kmalloc(bufsize, GFP_KERNEL);
+ if (!dmabuf)
+ return -ENOMEM;
+
+ result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
+ CP210X_VENDOR_SPECIFIC, type, val,
+ cp210x_interface_num(serial), dmabuf, bufsize,
+ USB_CTRL_GET_TIMEOUT);
+ if (result == bufsize) {
+ memcpy(buf, dmabuf, bufsize);
+ result = 0;
+ } else {
+ dev_err(&serial->interface->dev,
+ "failed to get vendor val 0x%04x size %d: %d\n", val,
+ bufsize, result);
+ if (result >= 0)
+ result = -EIO;
+ }
+
+ kfree(dmabuf);
+
+ return result;
+}
+
/*
* Writes any 16-bit CP210X_ register (req) whose value is passed
* entirely in the wValue field of the USB request.
return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
}
+#ifdef CONFIG_GPIOLIB
+/*
+ * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
+ * Data in buf must be in native USB byte order.
+ */
+static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
+ u16 val, void *buf, int bufsize)
+{
+ void *dmabuf;
+ int result;
+
+ dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
+ if (!dmabuf)
+ return -ENOMEM;
+
+ result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
+ CP210X_VENDOR_SPECIFIC, type, val,
+ cp210x_interface_num(serial), dmabuf, bufsize,
+ USB_CTRL_SET_TIMEOUT);
+
+ kfree(dmabuf);
+
+ if (result == bufsize) {
+ result = 0;
+ } else {
+ dev_err(&serial->interface->dev,
+ "failed to set vendor val 0x%04x size %d: %d\n", val,
+ bufsize, result);
+ if (result >= 0)
+ result = -EIO;
+ }
+
+ return result;
+}
+#endif
+
/*
* Detect CP2108 GET_LINE_CTL bug and activate workaround.
* Write a known good value 0x800, read it back.
cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
}
+#ifdef CONFIG_GPIOLIB
+static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
+{
+ struct usb_serial *serial = gpiochip_get_data(gc);
+ struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+
+ switch (offset) {
+ case 0:
+ if (priv->config & CP2105_GPIO0_TXLED_MODE)
+ return -ENODEV;
+ break;
+ case 1:
+ if (priv->config & (CP2105_GPIO1_RXLED_MODE |
+ CP2105_GPIO1_RS485_MODE))
+ return -ENODEV;
+ break;
+ }
+
+ return 0;
+}
+
+static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct usb_serial *serial = gpiochip_get_data(gc);
+ int result;
+ u8 buf;
+
+ result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST,
+ CP210X_READ_LATCH, &buf, sizeof(buf));
+ if (result < 0)
+ return result;
+
+ return !!(buf & BIT(gpio));
+}
+
+static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
+{
+ struct usb_serial *serial = gpiochip_get_data(gc);
+ struct cp210x_gpio_write buf;
+
+ if (value == 1)
+ buf.state = BIT(gpio);
+ else
+ buf.state = 0;
+
+ buf.mask = BIT(gpio);
+
+ cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE,
+ CP210X_WRITE_LATCH, &buf, sizeof(buf));
+}
+
+static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
+{
+ /* Hardware does not support an input mode */
+ return 0;
+}
+
+static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
+{
+ /* Hardware does not support an input mode */
+ return -ENOTSUPP;
+}
+
+static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
+ int value)
+{
+ return 0;
+}
+
+static int cp210x_gpio_set_single_ended(struct gpio_chip *gc, unsigned int gpio,
+ enum single_ended_mode mode)
+{
+ struct usb_serial *serial = gpiochip_get_data(gc);
+ struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+
+ /* Succeed only if in correct mode (this can't be set at runtime) */
+ if ((mode == LINE_MODE_PUSH_PULL) && (priv->gpio_mode & BIT(gpio)))
+ return 0;
+
+ if ((mode == LINE_MODE_OPEN_DRAIN) && !(priv->gpio_mode & BIT(gpio)))
+ return 0;
+
+ return -ENOTSUPP;
+}
+
+/*
+ * This function is for configuring GPIO using shared pins, where other signals
+ * are made unavailable by configuring the use of GPIO. This is believed to be
+ * only applicable to the cp2105 at this point, the other devices supported by
+ * this driver that provide GPIO do so in a way that does not impact other
+ * signals and are thus expected to have very different initialisation.
+ */
+static int cp2105_shared_gpio_init(struct usb_serial *serial)
+{
+ struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+ struct cp210x_pin_mode mode;
+ struct cp210x_config config;
+ u8 intf_num = cp210x_interface_num(serial);
+ int result;
+
+ result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
+ CP210X_GET_DEVICEMODE, &mode,
+ sizeof(mode));
+ if (result < 0)
+ return result;
+
+ result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
+ CP210X_GET_PORTCONFIG, &config,
+ sizeof(config));
+ if (result < 0)
+ return result;
+
+ /* 2 banks of GPIO - One for the pins taken from each serial port */
+ if (intf_num == 0) {
+ if (mode.eci == CP210X_PIN_MODE_MODEM)
+ return 0;
+
+ priv->config = config.eci_cfg;
+ priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
+ CP210X_ECI_GPIO_MODE_MASK) >>
+ CP210X_ECI_GPIO_MODE_OFFSET);
+ priv->gc.ngpio = 2;
+ } else if (intf_num == 1) {
+ if (mode.sci == CP210X_PIN_MODE_MODEM)
+ return 0;
+
+ priv->config = config.sci_cfg;
+ priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
+ CP210X_SCI_GPIO_MODE_MASK) >>
+ CP210X_SCI_GPIO_MODE_OFFSET);
+ priv->gc.ngpio = 3;
+ } else {
+ return -ENODEV;
+ }
+
+ priv->gc.label = "cp210x";
+ priv->gc.request = cp210x_gpio_request;
+ priv->gc.get_direction = cp210x_gpio_direction_get;
+ priv->gc.direction_input = cp210x_gpio_direction_input;
+ priv->gc.direction_output = cp210x_gpio_direction_output;
+ priv->gc.get = cp210x_gpio_get;
+ priv->gc.set = cp210x_gpio_set;
+ priv->gc.set_single_ended = cp210x_gpio_set_single_ended;
+ priv->gc.owner = THIS_MODULE;
+ priv->gc.parent = &serial->interface->dev;
+ priv->gc.base = -1;
+ priv->gc.can_sleep = true;
+
+ result = gpiochip_add_data(&priv->gc, serial);
+ if (!result)
+ priv->gpio_registered = 1;
+
+ return result;
+}
+
+static void cp210x_gpio_remove(struct usb_serial *serial)
+{
+ struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+
+ if (priv->gpio_registered) {
+ gpiochip_remove(&priv->gc);
+ priv->gpio_registered = 0;
+ }
+}
+
+#else
+
+static int cp2105_shared_gpio_init(struct usb_serial *serial)
+{
+ return 0;
+}
+
+static void cp210x_gpio_remove(struct usb_serial *serial)
+{
+ /* Nothing to do */
+}
+
+#endif
+
static int cp210x_port_probe(struct usb_serial_port *port)
{
struct usb_serial *serial = port->serial;
- struct usb_host_interface *cur_altsetting;
struct cp210x_port_private *port_priv;
int ret;
if (!port_priv)
return -ENOMEM;
- cur_altsetting = serial->interface->cur_altsetting;
- port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
+ port_priv->bInterfaceNumber = cp210x_interface_num(serial);
usb_set_serial_port_data(port, port_priv);
return 0;
}
+static int cp210x_attach(struct usb_serial *serial)
+{
+ int result;
+ struct cp210x_serial_private *priv;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
+ CP210X_GET_PARTNUM, &priv->partnum,
+ sizeof(priv->partnum));
+ if (result < 0)
+ goto err_free_priv;
+
+ usb_set_serial_data(serial, priv);
+
+ if (priv->partnum == CP210X_PARTNUM_CP2105) {
+ result = cp2105_shared_gpio_init(serial);
+ if (result < 0) {
+ dev_err(&serial->interface->dev,
+ "GPIO initialisation failed, continuing without GPIO support\n");
+ }
+ }
+
+ return 0;
+err_free_priv:
+ kfree(priv);
+
+ return result;
+}
+
+static void cp210x_disconnect(struct usb_serial *serial)
+{
+ cp210x_gpio_remove(serial);
+}
+
+static void cp210x_release(struct usb_serial *serial)
+{
+ struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+
+ cp210x_gpio_remove(serial);
+
+ kfree(priv);
+}
+
module_usb_serial_driver(serial_drivers, id_table);
MODULE_DESCRIPTION(DRIVER_DESC);
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