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path: root/drivers/usb/serial/cp210x.c
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Diffstat (limited to 'drivers/usb/serial/cp210x.c')
-rw-r--r--drivers/usb/serial/cp210x.c421
1 files changed, 340 insertions, 81 deletions
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index 626a29d9aa58..c0777a374a88 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -239,11 +239,14 @@ MODULE_DEVICE_TABLE(usb, id_table);
struct cp210x_serial_private {
#ifdef CONFIG_GPIOLIB
struct gpio_chip gc;
- u8 config;
- u8 gpio_mode;
bool gpio_registered;
+ u8 gpio_pushpull;
+ u8 gpio_altfunc;
+ u8 gpio_input;
#endif
u8 partnum;
+ speed_t max_speed;
+ bool use_actual_rate;
};
struct cp210x_port_private {
@@ -356,6 +359,7 @@ static struct usb_serial_driver * const serial_drivers[] = {
#define CONTROL_WRITE_RTS 0x0200
/* CP210X_VENDOR_SPECIFIC values */
+#define CP210X_READ_2NCONFIG 0x000E
#define CP210X_READ_LATCH 0x00C2
#define CP210X_GET_PARTNUM 0x370B
#define CP210X_GET_PORTCONFIG 0x370C
@@ -369,6 +373,9 @@ static struct usb_serial_driver * const serial_drivers[] = {
#define CP210X_PARTNUM_CP2104 0x04
#define CP210X_PARTNUM_CP2105 0x05
#define CP210X_PARTNUM_CP2108 0x08
+#define CP210X_PARTNUM_CP2102N_QFN28 0x20
+#define CP210X_PARTNUM_CP2102N_QFN24 0x21
+#define CP210X_PARTNUM_CP2102N_QFN20 0x22
#define CP210X_PARTNUM_UNKNOWN 0xFF
/* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
@@ -462,6 +469,12 @@ struct cp210x_config {
#define CP2105_GPIO1_RXLED_MODE BIT(1)
#define CP2105_GPIO1_RS485_MODE BIT(2)
+/* CP2102N configuration array indices */
+#define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2
+#define CP210X_2NCONFIG_GPIO_MODE_IDX 581
+#define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587
+#define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600
+
/* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
struct cp210x_gpio_write {
u8 mask;
@@ -767,48 +780,6 @@ static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
return 0;
}
-/*
- * cp210x_quantise_baudrate
- * Quantises the baud rate as per AN205 Table 1
- */
-static unsigned int cp210x_quantise_baudrate(unsigned int baud)
-{
- if (baud <= 300)
- baud = 300;
- else if (baud <= 600) baud = 600;
- else if (baud <= 1200) baud = 1200;
- else if (baud <= 1800) baud = 1800;
- else if (baud <= 2400) baud = 2400;
- else if (baud <= 4000) baud = 4000;
- else if (baud <= 4803) baud = 4800;
- else if (baud <= 7207) baud = 7200;
- else if (baud <= 9612) baud = 9600;
- else if (baud <= 14428) baud = 14400;
- else if (baud <= 16062) baud = 16000;
- else if (baud <= 19250) baud = 19200;
- else if (baud <= 28912) baud = 28800;
- else if (baud <= 38601) baud = 38400;
- else if (baud <= 51558) baud = 51200;
- else if (baud <= 56280) baud = 56000;
- else if (baud <= 58053) baud = 57600;
- else if (baud <= 64111) baud = 64000;
- else if (baud <= 77608) baud = 76800;
- else if (baud <= 117028) baud = 115200;
- else if (baud <= 129347) baud = 128000;
- else if (baud <= 156868) baud = 153600;
- else if (baud <= 237832) baud = 230400;
- else if (baud <= 254234) baud = 250000;
- else if (baud <= 273066) baud = 256000;
- else if (baud <= 491520) baud = 460800;
- else if (baud <= 567138) baud = 500000;
- else if (baud <= 670254) baud = 576000;
- else if (baud < 1000000)
- baud = 921600;
- else if (baud > 2000000)
- baud = 2000000;
- return baud;
-}
-
static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
{
int result;
@@ -1028,6 +999,75 @@ static void cp210x_get_termios_port(struct usb_serial_port *port,
*cflagp = cflag;
}
+struct cp210x_rate {
+ speed_t rate;
+ speed_t high;
+};
+
+static const struct cp210x_rate cp210x_an205_table1[] = {
+ { 300, 300 },
+ { 600, 600 },
+ { 1200, 1200 },
+ { 1800, 1800 },
+ { 2400, 2400 },
+ { 4000, 4000 },
+ { 4800, 4803 },
+ { 7200, 7207 },
+ { 9600, 9612 },
+ { 14400, 14428 },
+ { 16000, 16062 },
+ { 19200, 19250 },
+ { 28800, 28912 },
+ { 38400, 38601 },
+ { 51200, 51558 },
+ { 56000, 56280 },
+ { 57600, 58053 },
+ { 64000, 64111 },
+ { 76800, 77608 },
+ { 115200, 117028 },
+ { 128000, 129347 },
+ { 153600, 156868 },
+ { 230400, 237832 },
+ { 250000, 254234 },
+ { 256000, 273066 },
+ { 460800, 491520 },
+ { 500000, 567138 },
+ { 576000, 670254 },
+ { 921600, UINT_MAX }
+};
+
+/*
+ * Quantises the baud rate as per AN205 Table 1
+ */
+static speed_t cp210x_get_an205_rate(speed_t baud)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
+ if (baud <= cp210x_an205_table1[i].high)
+ break;
+ }
+
+ return cp210x_an205_table1[i].rate;
+}
+
+static speed_t cp210x_get_actual_rate(struct usb_serial *serial, speed_t baud)
+{
+ struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+ unsigned int prescale = 1;
+ unsigned int div;
+
+ baud = clamp(baud, 300u, priv->max_speed);
+
+ if (baud <= 365)
+ prescale = 4;
+
+ div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
+ baud = 48000000 / (2 * prescale * div);
+
+ return baud;
+}
+
/*
* CP2101 supports the following baud rates:
*
@@ -1057,16 +1097,24 @@ static void cp210x_get_termios_port(struct usb_serial_port *port,
static void cp210x_change_speed(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
+ struct usb_serial *serial = port->serial;
+ struct cp210x_serial_private *priv = usb_get_serial_data(serial);
u32 baud;
baud = tty->termios.c_ospeed;
- /* This maps the requested rate to a rate valid on cp2102 or cp2103,
- * or to an arbitrary rate in [1M,2M].
+ /*
+ * This maps the requested rate to the actual rate, a valid rate on
+ * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
*
* NOTE: B0 is not implemented.
*/
- baud = cp210x_quantise_baudrate(baud);
+ if (priv->use_actual_rate)
+ baud = cp210x_get_actual_rate(serial, baud);
+ else if (baud < 1000000)
+ baud = cp210x_get_an205_rate(baud);
+ else if (baud > priv->max_speed)
+ baud = priv->max_speed;
dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
@@ -1288,17 +1336,8 @@ 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;
- }
+ if (priv->gpio_altfunc & BIT(offset))
+ return -ENODEV;
return 0;
}
@@ -1306,10 +1345,15 @@ static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
{
struct usb_serial *serial = gpiochip_get_data(gc);
+ struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+ u8 req_type = REQTYPE_DEVICE_TO_HOST;
int result;
u8 buf;
- result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST,
+ if (priv->partnum == CP210X_PARTNUM_CP2105)
+ req_type = REQTYPE_INTERFACE_TO_HOST;
+
+ result = cp210x_read_vendor_block(serial, req_type,
CP210X_READ_LATCH, &buf, sizeof(buf));
if (result < 0)
return result;
@@ -1320,7 +1364,9 @@ static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int 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_serial_private *priv = usb_get_serial_data(serial);
struct cp210x_gpio_write buf;
+ int result;
if (value == 1)
buf.state = BIT(gpio);
@@ -1329,25 +1375,68 @@ static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
buf.mask = BIT(gpio);
- cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE,
- CP210X_WRITE_LATCH, &buf, sizeof(buf));
+ if (priv->partnum == CP210X_PARTNUM_CP2105) {
+ result = cp210x_write_vendor_block(serial,
+ REQTYPE_HOST_TO_INTERFACE,
+ CP210X_WRITE_LATCH, &buf,
+ sizeof(buf));
+ } else {
+ u16 wIndex = buf.state << 8 | buf.mask;
+
+ result = usb_control_msg(serial->dev,
+ usb_sndctrlpipe(serial->dev, 0),
+ CP210X_VENDOR_SPECIFIC,
+ REQTYPE_HOST_TO_DEVICE,
+ CP210X_WRITE_LATCH,
+ wIndex,
+ NULL, 0, USB_CTRL_SET_TIMEOUT);
+ }
+
+ if (result < 0) {
+ dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
+ result);
+ }
}
static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
{
- /* Hardware does not support an input mode */
- return 0;
+ struct usb_serial *serial = gpiochip_get_data(gc);
+ struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+
+ return priv->gpio_input & BIT(gpio);
}
static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
{
- /* Hardware does not support an input mode */
- return -ENOTSUPP;
+ struct usb_serial *serial = gpiochip_get_data(gc);
+ struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+
+ if (priv->partnum == CP210X_PARTNUM_CP2105) {
+ /* hardware does not support an input mode */
+ return -ENOTSUPP;
+ }
+
+ /* push-pull pins cannot be changed to be inputs */
+ if (priv->gpio_pushpull & BIT(gpio))
+ return -EINVAL;
+
+ /* make sure to release pin if it is being driven low */
+ cp210x_gpio_set(gc, gpio, 1);
+
+ priv->gpio_input |= BIT(gpio);
+
+ return 0;
}
static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
int value)
{
+ struct usb_serial *serial = gpiochip_get_data(gc);
+ struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+
+ priv->gpio_input &= ~BIT(gpio);
+ cp210x_gpio_set(gc, gpio, value);
+
return 0;
}
@@ -1360,11 +1449,11 @@ static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
/* Succeed only if in correct mode (this can't be set at runtime) */
if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
- (priv->gpio_mode & BIT(gpio)))
+ (priv->gpio_pushpull & BIT(gpio)))
return 0;
if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
- !(priv->gpio_mode & BIT(gpio)))
+ !(priv->gpio_pushpull & BIT(gpio)))
return 0;
return -ENOTSUPP;
@@ -1377,12 +1466,13 @@ static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
* 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)
+static int cp2105_gpioconf_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);
+ u8 iface_config;
int result;
result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
@@ -1399,20 +1489,26 @@ static int cp2105_shared_gpio_init(struct usb_serial *serial)
/* 2 banks of GPIO - One for the pins taken from each serial port */
if (intf_num == 0) {
- if (mode.eci == CP210X_PIN_MODE_MODEM)
+ if (mode.eci == CP210X_PIN_MODE_MODEM) {
+ /* mark all GPIOs of this interface as reserved */
+ priv->gpio_altfunc = 0xff;
return 0;
+ }
- priv->config = config.eci_cfg;
- priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
+ iface_config = config.eci_cfg;
+ priv->gpio_pushpull = (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)
+ if (mode.sci == CP210X_PIN_MODE_MODEM) {
+ /* mark all GPIOs of this interface as reserved */
+ priv->gpio_altfunc = 0xff;
return 0;
+ }
- priv->config = config.sci_cfg;
- priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
+ iface_config = config.sci_cfg;
+ priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
CP210X_SCI_GPIO_MODE_MASK) >>
CP210X_SCI_GPIO_MODE_OFFSET);
priv->gc.ngpio = 3;
@@ -1420,6 +1516,125 @@ static int cp2105_shared_gpio_init(struct usb_serial *serial)
return -ENODEV;
}
+ /* mark all pins which are not in GPIO mode */
+ if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */
+ priv->gpio_altfunc |= BIT(0);
+ if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */
+ CP2105_GPIO1_RS485_MODE))
+ priv->gpio_altfunc |= BIT(1);
+
+ /* driver implementation for CP2105 only supports outputs */
+ priv->gpio_input = 0;
+
+ return 0;
+}
+
+static int cp2102n_gpioconf_init(struct usb_serial *serial)
+{
+ struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+ const u16 config_size = 0x02a6;
+ u8 gpio_rst_latch;
+ u8 config_version;
+ u8 gpio_pushpull;
+ u8 *config_buf;
+ u8 gpio_latch;
+ u8 gpio_ctrl;
+ int result;
+ u8 i;
+
+ /*
+ * Retrieve device configuration from the device.
+ * The array received contains all customization settings done at the
+ * factory/manufacturer. Format of the array is documented at the
+ * time of writing at:
+ * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
+ */
+ config_buf = kmalloc(config_size, GFP_KERNEL);
+ if (!config_buf)
+ return -ENOMEM;
+
+ result = cp210x_read_vendor_block(serial,
+ REQTYPE_DEVICE_TO_HOST,
+ CP210X_READ_2NCONFIG,
+ config_buf,
+ config_size);
+ if (result < 0) {
+ kfree(config_buf);
+ return result;
+ }
+
+ config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
+ gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
+ gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
+ gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
+
+ kfree(config_buf);
+
+ /* Make sure this is a config format we understand. */
+ if (config_version != 0x01)
+ return -ENOTSUPP;
+
+ /*
+ * We only support 4 GPIOs even on the QFN28 package, because
+ * config locations of GPIOs 4-6 determined using reverse
+ * engineering revealed conflicting offsets with other
+ * documented functions. So we'll just play it safe for now.
+ */
+ priv->gc.ngpio = 4;
+
+ /*
+ * Get default pin states after reset. Needed so we can determine
+ * the direction of an open-drain pin.
+ */
+ gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
+
+ /* 0 indicates open-drain mode, 1 is push-pull */
+ priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
+
+ /* 0 indicates GPIO mode, 1 is alternate function */
+ priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
+
+ /*
+ * The CP2102N does not strictly has input and output pin modes,
+ * it only knows open-drain and push-pull modes which is set at
+ * factory. An open-drain pin can function both as an
+ * input or an output. We emulate input mode for open-drain pins
+ * by making sure they are not driven low, and we do not allow
+ * push-pull pins to be set as an input.
+ */
+ for (i = 0; i < priv->gc.ngpio; ++i) {
+ /*
+ * Set direction to "input" iff pin is open-drain and reset
+ * value is 1.
+ */
+ if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
+ priv->gpio_input |= BIT(i);
+ }
+
+ return 0;
+}
+
+static int cp210x_gpio_init(struct usb_serial *serial)
+{
+ struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+ int result;
+
+ switch (priv->partnum) {
+ case CP210X_PARTNUM_CP2105:
+ result = cp2105_gpioconf_init(serial);
+ break;
+ case CP210X_PARTNUM_CP2102N_QFN28:
+ case CP210X_PARTNUM_CP2102N_QFN24:
+ case CP210X_PARTNUM_CP2102N_QFN20:
+ result = cp2102n_gpioconf_init(serial);
+ break;
+ default:
+ return 0;
+ }
+
+ if (result < 0)
+ return result;
+
priv->gc.label = "cp210x";
priv->gc.request = cp210x_gpio_request;
priv->gc.get_direction = cp210x_gpio_direction_get;
@@ -1452,7 +1667,7 @@ static void cp210x_gpio_remove(struct usb_serial *serial)
#else
-static int cp2105_shared_gpio_init(struct usb_serial *serial)
+static int cp210x_gpio_init(struct usb_serial *serial)
{
return 0;
}
@@ -1497,6 +1712,50 @@ static int cp210x_port_remove(struct usb_serial_port *port)
return 0;
}
+static void cp210x_init_max_speed(struct usb_serial *serial)
+{
+ struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+ bool use_actual_rate = false;
+ speed_t max;
+
+ switch (priv->partnum) {
+ case CP210X_PARTNUM_CP2101:
+ max = 921600;
+ break;
+ case CP210X_PARTNUM_CP2102:
+ case CP210X_PARTNUM_CP2103:
+ max = 1000000;
+ break;
+ case CP210X_PARTNUM_CP2104:
+ use_actual_rate = true;
+ max = 2000000;
+ break;
+ case CP210X_PARTNUM_CP2108:
+ max = 2000000;
+ break;
+ case CP210X_PARTNUM_CP2105:
+ if (cp210x_interface_num(serial) == 0) {
+ use_actual_rate = true;
+ max = 2000000; /* ECI */
+ } else {
+ max = 921600; /* SCI */
+ }
+ break;
+ case CP210X_PARTNUM_CP2102N_QFN28:
+ case CP210X_PARTNUM_CP2102N_QFN24:
+ case CP210X_PARTNUM_CP2102N_QFN20:
+ use_actual_rate = true;
+ max = 3000000;
+ break;
+ default:
+ max = 2000000;
+ break;
+ }
+
+ priv->max_speed = max;
+ priv->use_actual_rate = use_actual_rate;
+}
+
static int cp210x_attach(struct usb_serial *serial)
{
int result;
@@ -1517,12 +1776,12 @@ static int cp210x_attach(struct usb_serial *serial)
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");
- }
+ cp210x_init_max_speed(serial);
+
+ result = cp210x_gpio_init(serial);
+ if (result < 0) {
+ dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
+ result);
}
return 0;