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author | anish kumar <anish198519851985@gmail.com> | 2012-08-17 16:57:22 (GMT) |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-09-05 19:20:49 (GMT) |
commit | 19939860dcae5a3b2e11318eb7d65b4db2e55e2b (patch) | |
tree | f7506b914b4a2093703e5bd1fb582a3ffabc6166 /include | |
parent | c338bb0380b1cd64ae566d1ea7d1bfd6c811297d (diff) | |
download | linux-fsl-qoriq-19939860dcae5a3b2e11318eb7d65b4db2e55e2b.tar.xz |
extcon: adc_jack: adc-jack driver to support 3.5 pi or simliar devices
External connector devices that decides connection information based on
ADC values may use adc-jack device driver. The user simply needs to
provide a table of adc range and connection states. Then, extcon
framework will automatically notify others.
Changes in V1:
added Lars-Peter Clausen suggested changes:
Using macros to get rid of boiler plate code such as devm_kzalloc
and module_platform_driver.Other changes suggested are related to
coding guidelines.
Changes in V2:
Removed some unnecessary checks and changed the way we are un-regitering
extcon and freeing the irq while removing.
Changes in V3:
Renamed the files to comply with extcon naming.
Changes in V4:
Added the cancel_work_sync during removing of driver.
Changes in V5:
Added the dependency of IIO in Kconfig.
Changes in V6:
Some nitpicks related to naming.
Changes in this version:
V6 patch version patch broke the build:
ERROR: "extcon_cable_name" [drivers/extcon/extcon-adc-jack.ko] undefined!
Fixed it in this version.
Acked-by: Jonathan Cameron <jic23@kernel.org>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: anish kumar <anish.singh@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/extcon/extcon-adc-jack.h | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/include/linux/extcon/extcon-adc-jack.h b/include/linux/extcon/extcon-adc-jack.h new file mode 100644 index 0000000..20e9eef --- /dev/null +++ b/include/linux/extcon/extcon-adc-jack.h @@ -0,0 +1,71 @@ +/* + * include/linux/extcon/extcon-adc-jack.h + * + * Analog Jack extcon driver with ADC-based detection capability. + * + * Copyright (C) 2012 Samsung Electronics + * MyungJoo Ham <myungjoo.ham@samsung.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#ifndef _EXTCON_ADC_JACK_H_ +#define _EXTCON_ADC_JACK_H_ __FILE__ + +#include <linux/module.h> +#include <linux/extcon.h> + +/** + * struct adc_jack_cond - condition to use an extcon state + * @state - the corresponding extcon state (if 0, this struct denotes + * the last adc_jack_cond element among the array) + * @min_adc - min adc value for this condition + * @max_adc - max adc value for this condition + * + * For example, if { .state = 0x3, .min_adc = 100, .max_adc = 200}, it means + * that if ADC value is between (inclusive) 100 and 200, than the cable 0 and + * 1 are attached (1<<0 | 1<<1 == 0x3) + * + * Note that you don't need to describe condition for "no cable attached" + * because when no adc_jack_cond is met, state = 0 is automatically chosen. + */ +struct adc_jack_cond { + u32 state; /* extcon state value. 0 if invalid */ + u32 min_adc; + u32 max_adc; +}; + +/** + * struct adc_jack_pdata - platform data for adc jack device. + * @name - name of the extcon device. If null, "adc-jack" is used. + * @consumer_channel - Unique name to identify the channel on the consumer + * side. This typically describes the channels used within + * the consumer. E.g. 'battery_voltage' + * @cable_names - array of cable names ending with null. + * @adc_contitions - array of struct adc_jack_cond conditions ending + * with .state = 0 entry. This describes how to decode + * adc values into extcon state. + * @irq_flags - irq flags used for the @irq + * @handling_delay_ms - in some devices, we need to read ADC value some + * milli-seconds after the interrupt occurs. You may + * describe such delays with @handling_delay_ms, which + * is rounded-off by jiffies. + */ +struct adc_jack_pdata { + const char *name; + const char *consumer_channel; + /* + * The last entry should be NULL + */ + const char **cable_names; + /* The last entry's state should be 0 */ + struct adc_jack_cond *adc_conditions; + + unsigned long irq_flags; + unsigned long handling_delay_ms; /* in ms */ +}; + +#endif /* _EXTCON_ADC_JACK_H */ |