From: Greg KH <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org,
alan@lxorguk.ukuu.org.uk, Johan Hovold <jhovold@gmail.com>,
Preston Fick <preston.fick@silabs.com>
Subject: [63/65] USB: cp210x: clean up, refactor and document speed handling
Date: Wed, 01 Feb 2012 12:56:43 -0800 [thread overview]
Message-ID: <20120201205742.990713914@clark.kroah.org> (raw)
In-Reply-To: <20120201210236.GA25966@kroah.com>
3.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johan Hovold <jhovold@gmail.com>
commit e5990874e511d5bbca23b3396419480cb2ca0ee7 upstream.
Clean up and refactor speed handling.
Document baud rate handling for CP210{1,2,4,5,10}.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Cc: Preston Fick <preston.fick@silabs.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/usb/serial/cp210x.c | 69 +++++++++++++++++++++++++++++++++++---------
1 file changed, 56 insertions(+), 13 deletions(-)
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -39,6 +39,8 @@ static void cp210x_get_termios(struct tt
struct usb_serial_port *port);
static void cp210x_get_termios_port(struct usb_serial_port *port,
unsigned int *cflagp, unsigned int *baudp);
+static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
+ struct ktermios *);
static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
struct ktermios*);
static int cp210x_tiocmget(struct tty_struct *);
@@ -572,11 +574,62 @@ static void cp210x_get_termios_port(stru
*cflagp = cflag;
}
+/*
+ * CP2101 supports the following baud rates:
+ *
+ * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
+ * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
+ *
+ * CP2102 and CP2103 support the following additional rates:
+ *
+ * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
+ * 576000
+ *
+ * The device will map a requested rate to a supported one, but the result
+ * of requests for rates greater than 1053257 is undefined (see AN205).
+ *
+ * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
+ * respectively, with an error less than 1%. The actual rates are determined
+ * by
+ *
+ * div = round(freq / (2 x prescale x request))
+ * actual = freq / (2 x prescale x div)
+ *
+ * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
+ * or 1 otherwise.
+ * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
+ * otherwise.
+ */
+static void cp210x_change_speed(struct tty_struct *tty,
+ struct usb_serial_port *port, struct ktermios *old_termios)
+{
+ u32 baud;
+
+ baud = tty->termios->c_ospeed;
+
+ /* This maps the requested rate to a rate valid on cp2102 or cp2103.
+ *
+ * NOTE: B0 is not implemented.
+ */
+ baud = cp210x_quantise_baudrate(baud);
+
+ dbg("%s - setting baud rate to %u", __func__, baud);
+ if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud,
+ sizeof(baud))) {
+ dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
+ if (old_termios)
+ baud = old_termios->c_ospeed;
+ else
+ baud = 9600;
+ }
+
+ tty_encode_baud_rate(tty, baud, baud);
+}
+
static void cp210x_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
unsigned int cflag, old_cflag;
- u32 baud;
unsigned int bits;
unsigned int modem_ctl[4];
@@ -588,19 +641,9 @@ static void cp210x_set_termios(struct tt
tty->termios->c_cflag &= ~CMSPAR;
cflag = tty->termios->c_cflag;
old_cflag = old_termios->c_cflag;
- baud = cp210x_quantise_baudrate(tty_get_baud_rate(tty));
- /* If the baud rate is to be updated*/
- if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
- dbg("%s - Setting baud rate to %d baud", __func__,
- baud);
- if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud, sizeof(baud))) {
- dbg("Baud rate requested not supported by device");
- baud = tty_termios_baud_rate(old_termios);
- }
- }
- /* Report back the resulting baud rate */
- tty_encode_baud_rate(tty, baud, baud);
+ if (tty->termios->c_ospeed != old_termios->c_ospeed)
+ cp210x_change_speed(tty, port, old_termios);
/* If the number of data bits is to be updated */
if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
next prev parent reply other threads:[~2012-02-01 21:42 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-01 21:02 [00/65] 3.0.19-stable review Greg KH
2012-02-01 20:55 ` [01/65] ALSA: hda - Fix silent outputs from docking-station jacks of Dell laptops Greg KH
2012-02-01 20:55 ` [02/65] eCryptfs: Sanitize write counts of /dev/ecryptfs Greg KH
2012-02-01 20:55 ` [03/65] ecryptfs: Improve metadata read failure logging Greg KH
2012-02-01 20:55 ` [04/65] eCryptfs: Make truncate path killable Greg KH
2012-02-01 20:55 ` [05/65] eCryptfs: Check inode changes in setattr Greg KH
2012-02-01 20:55 ` [06/65] eCryptfs: Fix oops when printing debug info in extent crypto functions Greg KH
2012-02-01 20:55 ` [07/65] drm/radeon/kms: Add an MSI quirk for Dell RS690 Greg KH
2012-02-01 20:55 ` [08/65] drm: Fix authentication kernel crash Greg KH
2012-02-01 20:55 ` [09/65] xfs: Fix missing xfs_iunlock() on error recovery path in xfs_readlink() Greg KH
2012-02-01 20:55 ` [10/65] crypto: sha512 - make it work, undo percpu message schedule Greg KH
2012-02-01 20:55 ` [11/65] crypto: sha512 - reduce stack usage to safe number Greg KH
2012-02-01 20:55 ` [12/65] ftrace: Balance records when updating the hash Greg KH
2012-02-01 20:55 ` [13/65] ftrace: Update filter when tracing enabled in set_ftrace_filter() Greg KH
2012-02-01 20:55 ` [14/65] ftrace: Fix unregister ftrace_ops accounting Greg KH
2012-02-01 20:55 ` [15/65] ah: Dont return NET_XMIT_DROP on input Greg KH
2012-02-01 20:55 ` [16/65] xfs: fix endian conversion issue in discard code Greg KH
2012-02-01 20:55 ` [17/65] x86/uv: Fix uv_gpa_to_soc_phys_ram() shift Greg KH
2012-02-01 20:55 ` [18/65] x86/microcode_amd: Add support for CPU family specific container files Greg KH
2012-02-01 20:55 ` [19/65] ALSA: hda - Fix silent output on ASUS A6Rp Greg KH
2012-02-01 20:56 ` [20/65] ALSA: hda - Fix silent output on Haier W18 laptop Greg KH
2012-02-01 20:56 ` [21/65] drm/i915/sdvo: always set positive sync polarity Greg KH
2012-02-01 20:56 ` [22/65] cap_syslog: dont use WARN_ONCE for CAP_SYS_ADMIN deprecation warning Greg KH
2012-02-01 20:56 ` [23/65] mach-ux500: enable ARM errata 764369 Greg KH
2012-02-01 20:56 ` [24/65] ARM: 7296/1: proc-v7.S: remove HARVARD_CACHE preprocessor guards Greg KH
2012-02-01 20:56 ` [25/65] USB: option: Add LG docomo L-02C Greg KH
2012-02-01 20:56 ` [26/65] USB: ftdi_sio: fix TIOCSSERIAL baud_base handling Greg KH
2012-02-01 20:56 ` [27/65] USB: ftdi_sio: fix initial baud rate Greg KH
2012-02-01 20:56 ` [28/65] USB: ftdi_sio: add PID for TI XDS100v2 / BeagleBone A3 Greg KH
2012-02-01 20:56 ` [29/65] USB: serial: ftdi additional IDs Greg KH
2012-02-01 20:56 ` [30/65] USB: ftdi_sio: Add more identifiers Greg KH
2012-02-01 20:56 ` [31/65] USB: cdc-wdm: updating desc->length must be protected by spin_lock Greg KH
2012-02-01 20:56 ` [32/65] USB: cdc-wdm: use two mutexes to allow simultaneous read and write Greg KH
2012-02-01 20:56 ` [33/65] qcaux: add more Pantech UML190 and UML290 ports Greg KH
2012-02-01 20:56 ` [34/65] usb: io_ti: Make edge_remove_sysfs_attrs the port_remove method Greg KH
2012-02-01 20:56 ` [35/65] TTY: fix UV serial console regression Greg KH
2012-02-01 20:56 ` [36/65] serial: amba-pl011: lock console writes against interrupts Greg KH
2012-02-01 20:56 ` [37/65] jsm: Fixed EEH recovery error Greg KH
2012-02-01 20:56 ` [38/65] vmwgfx: Fix assignment in vmw_framebuffer_create_handle Greg KH
2012-02-01 20:56 ` [39/65] USB: usbsevseg: fix max length Greg KH
2012-02-01 20:56 ` [40/65] drivers/usb/host/ehci-fsl.c: add missing iounmap Greg KH
2012-02-01 20:56 ` [41/65] xhci: Fix USB 3.0 device restart on resume Greg KH
2012-02-01 20:56 ` [42/65] xHCI: Cleanup isoc transfer ring when TD length mismatch found Greg KH
2012-02-01 20:56 ` [43/65] hwmon: (f71805f) Fix clamping of temperature limits Greg KH
2012-02-01 20:56 ` [44/65] hwmon: (w83627ehf) Disable setting DC mode for pwm2, pwm3 on NCT6776F Greg KH
2012-02-01 20:56 ` [45/65] hwmon: (sht15) fix bad error code Greg KH
2012-02-01 20:56 ` [46/65] USB: cdc-wdm: call wake_up_all to allow driver to shutdown on device removal Greg KH
2012-02-01 20:56 ` [47/65] USB: cdc-wdm: better allocate a buffer that is at least as big as we tell the USB core Greg KH
2012-02-01 20:56 ` [48/65] USB: cdc-wdm: Avoid hanging on interface with no USB_CDC_DMM_TYPE Greg KH
2012-02-01 20:56 ` [49/65] netns: fix net_alloc_generic() Greg KH
2012-02-01 20:56 ` [50/65] netns: Fail conspicously if someone uses net_generic at an inappropriate time Greg KH
2012-02-01 20:56 ` [51/65] net caif: Register properly as a pernet subsystem Greg KH
2012-02-01 20:56 ` [52/65] bonding: fix enslaving in alb mode when link down Greg KH
2012-02-01 20:56 ` [53/65] l2tp: l2tp_ip - fix possible oops on packet receive Greg KH
2012-02-01 20:56 ` [54/65] net: bpf_jit: fix divide by 0 generation Greg KH
2012-02-01 20:56 ` [55/65] rds: Make rds_sock_lock BH rather than IRQ safe Greg KH
2012-02-01 20:56 ` [56/65] tcp: fix tcp_trim_head() to adjust segment count with skb MSS Greg KH
2012-02-01 20:56 ` [57/65] tcp: md5: using remote adress for md5 lookup in rst packet Greg KH
2012-02-01 20:56 ` [58/65] USB: serial: CP210x: Added USB-ID for the Link Instruments MSO-19 Greg KH
2012-02-01 20:56 ` [59/65] USB: cp210x: call generic open last in open Greg KH
2012-02-01 20:56 ` [60/65] USB: cp210x: fix CP2104 baudrate usage Greg KH
2012-02-01 20:56 ` [61/65] USB: cp210x: do not map baud rates to B0 Greg KH
2012-02-01 20:56 ` [62/65] USB: cp210x: fix up set_termios variables Greg KH
2012-02-01 20:56 ` Greg KH [this message]
2012-02-01 20:56 ` [64/65] USB: cp210x: initialise baud rate at open Greg KH
2012-02-01 20:56 ` [65/65] USB: cp210x: allow more baud rates above 1Mbaud Greg KH
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