* [merged] documentation-led-drivers-lp5521-and-lp5523.patch removed from -mm tree
@ 2010-11-16 19:30 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2010-11-16 19:30 UTC (permalink / raw)
To: samu.p.onkalo, khali, rpurdie, mm-commits
The patch titled
Documentation: led drivers lp5521 and lp5523
has been removed from the -mm tree. Its filename was
documentation-led-drivers-lp5521-and-lp5523.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: Documentation: led drivers lp5521 and lp5523
From: Samu Onkalo <samu.p.onkalo@nokia.com>
Create sub directory Documentation/leds and add short documentation for
LP5521 and LP5523 drivers.
Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
Documentation/leds/leds-lp5521.txt | 88 +++++++++++++++++++++++++++
Documentation/leds/leds-lp5523.txt | 84 +++++++++++++++++++++++++
2 files changed, 172 insertions(+)
diff -puN /dev/null Documentation/leds/leds-lp5521.txt
--- /dev/null
+++ a/Documentation/leds/leds-lp5521.txt
@@ -0,0 +1,88 @@
+Kernel driver for lp5521
+========================
+
+* National Semiconductor LP5521 led driver chip
+* Datasheet: http://www.national.com/pf/LP/LP5521.html
+
+Authors: Mathias Nyman, Yuri Zaporozhets, Samu Onkalo
+Contact: Samu Onkalo (samu.p.onkalo-at-nokia.com)
+
+Description
+-----------
+
+LP5521 can drive up to 3 channels. Leds can be controlled directly via
+the led class control interface. Channels have generic names:
+lp5521:channelx, where x is 0 .. 2
+
+All three channels can be also controlled using the engine micro programs.
+More details of the instructions can be found from the public data sheet.
+
+Control interface for the engines:
+x is 1 .. 3
+enginex_mode : disabled, load, run
+enginex_load : store program (visible only in engine load mode)
+
+Example (start to blink the channel 2 led):
+cd /sys/class/leds/lp5521:channel2/device
+echo "load" > engine3_mode
+echo "037f4d0003ff6000" > engine3_load
+echo "run" > engine3_mode
+
+stop the engine:
+echo "disabled" > engine3_mode
+
+sysfs contains a selftest entry.
+The test communicates with the chip and checks that
+the clock mode is automatically set to the requested one.
+
+Each channel has its own led current settings.
+/sys/class/leds/lp5521:channel0/led_current - RW
+/sys/class/leds/lp5521:channel0/max_current - RO
+Format: 10x mA i.e 10 means 1.0 mA
+
+example platform data:
+
+Note: chan_nr can have values between 0 and 2.
+
+static struct lp5521_led_config lp5521_led_config[] = {
+ {
+ .chan_nr = 0,
+ .led_current = 50,
+ .max_current = 130,
+ }, {
+ .chan_nr = 1,
+ .led_current = 0,
+ .max_current = 130,
+ }, {
+ .chan_nr = 2,
+ .led_current = 0,
+ .max_current = 130,
+ }
+};
+
+static int lp5521_setup(void)
+{
+ /* setup HW resources */
+}
+
+static void lp5521_release(void)
+{
+ /* Release HW resources */
+}
+
+static void lp5521_enable(bool state)
+{
+ /* Control of chip enable signal */
+}
+
+static struct lp5521_platform_data lp5521_platform_data = {
+ .led_config = lp5521_led_config,
+ .num_channels = ARRAY_SIZE(lp5521_led_config),
+ .clock_mode = LP5521_CLOCK_EXT,
+ .setup_resources = lp5521_setup,
+ .release_resources = lp5521_release,
+ .enable = lp5521_enable,
+};
+
+If the current is set to 0 in the platform data, that channel is
+disabled and it is not visible in the sysfs.
diff -puN /dev/null Documentation/leds/leds-lp5523.txt
--- /dev/null
+++ a/Documentation/leds/leds-lp5523.txt
@@ -0,0 +1,84 @@
+Kernel driver for lp5523
+========================
+
+* National Semiconductor LP5523 led driver chip
+* Datasheet: http://www.national.com/pf/LP/LP5523.html
+
+Authors: Mathias Nyman, Yuri Zaporozhets, Samu Onkalo
+Contact: Samu Onkalo (samu.p.onkalo-at-nokia.com)
+
+Description
+-----------
+LP5523 can drive up to 9 channels. Leds can be controlled directly via
+the led class control interface. Channels have generic names:
+lp5523:channelx where x is 0...8
+
+The chip provides 3 engines. Each engine can control channels without
+interaction from the main CPU. Details of the micro engine code can be found
+from the public data sheet. Leds can be muxed to different channels.
+
+Control interface for the engines:
+x is 1 .. 3
+enginex_mode : disabled, load, run
+enginex_load : microcode load (visible only in load mode)
+enginex_leds : led mux control (visible only in load mode)
+
+cd /sys/class/leds/lp5523:channel2/device
+echo "load" > engine3_mode
+echo "9d80400004ff05ff437f0000" > engine3_load
+echo "111111111" > engine3_leds
+echo "run" > engine3_mode
+
+sysfs contains a selftest entry. It measures each channel
+voltage level and checks if it looks reasonable. If the level is too high,
+the led is missing; if the level is too low, there is a short circuit.
+
+Selftest uses always the current from the platform data.
+
+Each channel contains led current settings.
+/sys/class/leds/lp5523:channel2/led_current - RW
+/sys/class/leds/lp5523:channel2/max_current - RO
+Format: 10x mA i.e 10 means 1.0 mA
+
+Example platform data:
+
+Note - chan_nr can have values between 0 and 8.
+
+static struct lp5523_led_config lp5523_led_config[] = {
+ {
+ .chan_nr = 0,
+ .led_current = 50,
+ .max_current = 130,
+ },
+...
+ }, {
+ .chan_nr = 8,
+ .led_current = 50,
+ .max_current = 130,
+ }
+};
+
+static int lp5523_setup(void)
+{
+ /* Setup HW resources */
+}
+
+static void lp5523_release(void)
+{
+ /* Release HW resources */
+}
+
+static void lp5523_enable(bool state)
+{
+ /* Control chip enable signal */
+}
+
+static struct lp5523_platform_data lp5523_platform_data = {
+ .led_config = lp5523_led_config,
+ .num_channels = ARRAY_SIZE(lp5523_led_config),
+ .clock_mode = LP5523_CLOCK_EXT,
+ .setup_resources = lp5523_setup,
+ .release_resources = lp5523_release,
+ .enable = lp5523_enable,
+};
+
_
Patches currently in -mm which might be from samu.p.onkalo@nokia.com are
drivers-leds-leds-lp5521c-change-some-macros-to-functions.patch
drivers-leds-leds-lp5523c-change-some-macros-to-functions.patch
drivers-leds-leds-lp5521c-adjust-delays-and-add-comments-to-them.patch
drivers-leds-leds-lp5523c-adjust-delays-and-add-comments-to-them.patch
drivers-leds-leds-lp5521c-perform-sw-reset-before-detection.patch
drivers-leds-leds-lp5523c-perform-sw-reset-before-detection.patch
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2010-11-16 19:30 [merged] documentation-led-drivers-lp5521-and-lp5523.patch removed from -mm tree akpm
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