Replace the arbitrary software-reset call from the device-probe method, because: - It is defective. To work correctly, it should be two byte writes, not a single word write. As it stands, it does nothing. - Some devices with sx150x expanders installed have their NRESET pins ganged on the same line, so resetting one causes the others to reset - not a nice thing to do arbitrarily! - The probe, usually taking place at boot, implies a recent hard-reset, so a software reset at this point is just a waste of energy anyway. Therefore, make it optional, defaulting to off, as this will match the common case of probing at powerup and also matches the current broken no-op behavior. Signed-off-by: Gregory Bean <gbean@codeaurora.org> Reviewed-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Add support for exposing all GPIO pins as analog voltages. Though this is not an ideal use of the chip, some hardware engineers may decide that the LTC4245 meets their design requirements when studying the datasheet. The GPIO pins are sampled in round-robin fashion, meaning that a slow reader will see stale data. A userspace application can detect this, because it will get -EAGAIN when reading from a sysfs file which contains stale data. Users can choose to use this feature on a per-chip basis by using either platform data or the OF device tree (where applicable). Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu> Signed-off-by: Jean Delvare <khali@linux-fr.org>
* 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging: i2c: I2C bus multiplexer driver pca954x i2c: Multiplexed I2C bus core support i2c: Use a separate mutex for userspace client lists i2c: Make i2c_default_probe self-sufficient i2c: Drop dummy variable i2c: Move adapter locking helpers to i2c-core V4L/DVB: Use custom I2C probing function mechanism i2c: Add support for custom probe function i2c-dev: Use memdup_user i2c-dev: Remove unnecessary kmalloc casts
I2C driver for PCA954x I2C multiplexer series. Signed-off-by: Michael Lawnick <ml.lawnick@gmx.de> Acked-by: Rodolfo Giometti <giometti@linux.it> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Add support for Semtech SX150-series I2C GPIO expanders. Compatible models include: 8 bits: sx1508q 16 bits: sx1509q Signed-off-by: Gregory Bean <gbean@codeaurora.org> Cc: David Brownell <david-b@pacbell.net> Cc: Jean Delvare <khali@linux-fr.org> Cc: Trilok Soni <tsoni@codeaurora.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This patch allows exporting GPIO pins not used by the keypad itself to be accessible from elsewhere. Signed-off-by: Xiaolong Chen <xiao-long.chen@motorola.com> Signed-off-by: Yuanbo Ye <yuan-bo.ye@motorola.com> Signed-off-by: Tao Hu <taohu@motorola.com> Acked-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
The chip's full name is AT42QT602240 or ATMXT224. This is a capacitive touchscreen supporting 10-contact multitouch and using I2C interface. Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com> Acked-by: Henrik Rydberg <rydberg@euromail.se> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This adds support for MELPAS MCS5000/MSC5080 touch key controllers. Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
A column or row configured as a GPI can be programmed to be part of the key event table and therefore also capable of generating a key event interrupt. A key event interrupt caused by a GPI follows the same process flow as a key event interrupt caused by a key press. GPIs configured as part of the key event table allow single key switches and other GPI interrupts to be monitored. As part of the event table, GPIs are represented by the decimal value 97 (0x61 or 1100001) through the decimal value 114 (0x72 or 1110010). See table below for GPI event number assignments for rows and columns. GPI Event Number Assignments for Rows Row0 Row1 Row2 Row3 Row4 Row5 Row6 Row7 97 98 99 100 101 102 103 104 GPI Event Number Assignments for Cols Col0 Col1 Col2 Col3 Col4 Col5 Col6 Col7 Col8 Col9 105 106 107 108 109 110 111 112 113 114 Signed-off-by: Xiaolong Chen <xiao-long.chen@motorola.com> Signed-off-by: Yuanbo Ye <yuan-bo.ye@motorola.com> Signed-off-by: Tao Hu <taohu@motorola.com> Acked-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* 'for-linus' of git://git.o-hand.com/linux-rpurdie-backlight: gta02: Use pcf50633 backlight driver instead of platform backlight driver. backlight: pcf50633: Register a pcf50633-backlight device in pcf50633 core driver. backlight: Add pcf50633 backlight driver backlight: 88pm860x_bl: fix error handling in pm860x_backlight_probe backlight: max8925_bl: Fix error handling path backlight: l4f00242t03: fix error handling in l4f00242t03_probe backlight: add S6E63M0 AMOLED LCD Panel driver backlight: adp8860: add support for ADP8861 & ADP8863 backlight: mbp_nvidia_bl - Fix DMI_SYS_VENDOR for MacBook1,1 backlight: Add Cirrus EP93xx backlight driver backlight: l4f00242t03: Fix regulators handling code in remove function backlight: fix adp8860_bl build errors backlight: new driver for the ADP8860 backlight parts backlight: 88pm860x_bl - potential memory leak backlight: mbp_nvidia_bl - add support for older MacBookPro and MacBook 6,1. backlight: Kconfig cleanup backlight: backlight_device_register() return ERR_PTR()