* Re: Re: [PATCH V1]Extcon: adc_jack: adc-jack driver to support 3.5 pi or simliar devices @ 2012-08-07 5:57 MyungJoo Ham 2012-08-07 5:59 ` anish kumar 0 siblings, 1 reply; 2+ messages in thread From: MyungJoo Ham @ 2012-08-07 5:57 UTC (permalink / raw) To: anish kumar, Lars-Peter Clausen Cc: jic23@cam.ac.uk, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, ANISH KUMAR, 최찬우 PiBGcm9tOiBhbmlzaCBrdW1hciA8YW5pc2gxOTg1MTk4NTE5ODVAZ21haWwuY29tPg0KPiANCj4g RXh0ZXJuYWwgY29ubmVjdG9yIGRldmljZXMgdGhhdCBkZWNpZGVzIGNvbm5lY3Rpb24gaW5mb3Jt YXRpb24gYmFzZWQgb24NCj4gQURDIHZhbHVlcyBtYXkgdXNlIGFkYy1qYWNrIGRldmljZSBkcml2 ZXIuIFRoZSB1c2VyIHNpbXBseSBuZWVkcyB0bw0KPiBwcm92aWRlIGEgdGFibGUgb2YgYWRjIHJh bmdlIGFuZCBjb25uZWN0aW9uIHN0YXRlcy4gVGhlbiwgZXh0Y29uDQo+IGZyYW1ld29yayB3aWxs IGF1dG9tYXRpY2FsbHkgbm90aWZ5IG90aGVycy4NCj4gDQo+IENoYW5nZXMgaW4gdGhpcyB2ZXJz aW9uOg0KPiBhZGRlZCBMYXJzLVBldGVyIENsYXVzZW4gc3VnZ2VzdGVkIGNoYW5nZXM6DQo+IFVz aW5nIG1hY3JvcyB0byBnZXQgcmlkIG9mIGJvaWxlciBwbGF0ZSBjb2RlIHN1Y2ggYXMgZGV2bV9r 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permalink raw reply [flat|nested] 2+ messages in thread
* Re: Re: [PATCH V1]Extcon: adc_jack: adc-jack driver to support 3.5 pi or simliar devices 2012-08-07 5:57 Re: [PATCH V1]Extcon: adc_jack: adc-jack driver to support 3.5 pi or simliar devices MyungJoo Ham @ 2012-08-07 5:59 ` anish kumar 0 siblings, 0 replies; 2+ messages in thread From: anish kumar @ 2012-08-07 5:59 UTC (permalink / raw) To: myungjoo.ham Cc: Lars-Peter Clausen, jic23@cam.ac.uk, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, ANISH KUMAR, 최찬우 On Tue, 2012-08-07 at 05:57 +0000, MyungJoo Ham wrote: > > From: anish kumar <anish198519851985@gmail.com> > > > > 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 this version: > > 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. > > > > Signed-off-by: anish kumar <anish.singh@samsung.com> > > Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> > > Hello, > > > One little thing that I've missed before: > > Could you please rename the file? > > Though the initial files (class and gpio) didn't do it, > like other recent ones, let's use '-' instead of '_'. > Besides, could you please use "extcon" prefix for the filename? > > Thus, "adc_jack.c/h" --> "extcon-adc-jack.c/h" Sure updated patch is on the way. > > > Cheers > MyungJoo > > > --- > > drivers/extcon/Kconfig | 5 + > > drivers/extcon/Makefile | 1 + > > drivers/extcon/adc_jack.c | 193 +++++++++++++++++++++++++++++++++++++++ > > include/linux/extcon/adc_jack.h | 77 ++++++++++++++++ > > 4 files changed, 276 insertions(+), 0 deletions(-) > > create mode 100644 drivers/extcon/adc_jack.c > > create mode 100644 include/linux/extcon/adc_jack.h > > > > diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig > > index e175c8e..596e277 100644 > > --- a/drivers/extcon/Kconfig > > +++ b/drivers/extcon/Kconfig > > @@ -21,6 +21,11 @@ config EXTCON_GPIO > > Say Y here to enable GPIO based extcon support. Note that GPIO > > extcon supports single state per extcon instance. > > > > +config EXTCON_ADC_JACK > > + tristate "ADC Jack extcon support" > > + help > > + Say Y here to enable extcon device driver based on ADC values. > > + > > config EXTCON_MAX77693 > > tristate "MAX77693 EXTCON Support" > > depends on MFD_MAX77693 > > diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile > > index 88961b3..d95c5ea 100644 > > --- a/drivers/extcon/Makefile > > +++ b/drivers/extcon/Makefile > > @@ -4,6 +4,7 @@ > > > > obj-$(CONFIG_EXTCON) += extcon_class.o > > obj-$(CONFIG_EXTCON_GPIO) += extcon_gpio.o > > +obj-$(CONFIG_EXTCON_ADC_JACK) += adc_jack.o > > obj-$(CONFIG_EXTCON_MAX77693) += extcon-max77693.o > > obj-$(CONFIG_EXTCON_MAX8997) += extcon-max8997.o > > obj-$(CONFIG_EXTCON_ARIZONA) += extcon-arizona.o > > diff --git a/drivers/extcon/adc_jack.c b/drivers/extcon/adc_jack.c > > new file mode 100644 > > index 0000000..8b80af0 > > --- /dev/null > > +++ b/drivers/extcon/adc_jack.c > > @@ -0,0 +1,193 @@ > > +/* > > + * drivers/extcon/adc_jack.c > > + * > > + * Analog Jack extcon driver with ADC-based detection capability. > > + * > > + * Copyright (C) 2012 Samsung Electronics > > + * MyungJoo Ham <myungjoo.ham@samsung.com> > > + * > > + * Modified for calling to IIO to get adc by <anish.singh@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. > > + * > > + */ > > + > > +#include <linux/slab.h> > > +#include <linux/device.h> > > +#include <linux/platform_device.h> > > +#include <linux/interrupt.h> > > +#include <linux/workqueue.h> > > +#include <linux/iio/consumer.h> > > +#include <linux/extcon/adc_jack.h> > > +#include <linux/extcon.h> > > + > > +/** > > + * struct adc_jack_data - internal data for adc_jack device driver > > + * @edev - extcon device. > > + * @cable_names - list of supported cables. > > + * @num_cables - size of cable_names. > > + * @adc_condition - list of adc value conditions. > > + * @num_condition - size of adc_condition. > > + * @irq - irq number of attach/detach event (0 if not exist). > > + * @handling_delay - interrupt handler will schedule extcon event > > + * handling at handling_delay jiffies. > > + * @handler - extcon event handler called by interrupt handler. > > + * @get_adc - a callback to get ADC value to identify state. > > + */ > > +struct adc_jack_data { > > + struct extcon_dev edev; > > + > > + const char **cable_names; > > + int num_cables; > > + struct adc_jack_cond *adc_condition; > > + int num_conditions; > > + > > + int irq; > > + unsigned long handling_delay; /* in jiffies */ > > + struct delayed_work handler; > > + > > + struct iio_channel *chan; > > +}; > > + > > +static void adc_jack_handler(struct work_struct *work) > > +{ > > + struct adc_jack_data *data = container_of(to_delayed_work(work), > > + struct adc_jack_data, > > + handler); > > + u32 state = 0; > > + int ret, adc_val; > > + int i; > > + > > + ret = iio_read_channel_raw(data->chan, &adc_val); > > + if (ret < 0) { > > + dev_err(data->edev.dev, "read channel() error: %d\n", ret); > > + return; > > + } > > + > > + /* Get state from adc value with adc_condition */ > > + for (i = 0; i < data->num_conditions; i++) { > > + struct adc_jack_cond *def = &data->adc_condition[i]; > > + if (!def->state) > > + break; > > + if (def->min_adc <= adc_val && def->max_adc >= adc_val) { > > + state = def->state; > > + break; > > + } > > + } > > + /* if no def has met, it means state = 0 (no cables attached) */ > > + > > + extcon_set_state(&data->edev, state); > > +} > > + > > +static irqreturn_t adc_jack_irq_thread(int irq, void *_data) > > +{ > > + struct adc_jack_data *data = _data; > > + > > + schedule_delayed_work(&data->handler, data->handling_delay); > > + return IRQ_HANDLED; > > +} > > + > > +static int adc_jack_probe(struct platform_device *pdev) > > +{ > > + struct adc_jack_data *data; > > + struct adc_jack_pdata *pdata = pdev->dev.platform_data; > > + int i, err = 0; > > + > > + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); > > + if (!data) > > + return -ENOMEM; > > + > > + data->edev.name = pdata->name; > > + > > + if (pdata->cable_names) > > + data->edev.supported_cable = pdata->cable_names; > > + else > > + data->edev.supported_cable = extcon_cable_name; > > + > > + /* Check the length of array and set num_cables */ > > + for (i = 0; data->edev.supported_cable[i]; i++) > > + ; > > + if (i == 0 || i > SUPPORTED_CABLE_MAX) { > > + err = -EINVAL; > > + dev_err(&pdev->dev, "error: pdata->cable_names size = %d\n", > > + i - 1); > > + goto err_alloc; > > + } > > + data->num_cables = i; > > + > > + if (!pdata->adc_condition || > > + !pdata->adc_condition[0].state) { > > + err = -EINVAL; > > + dev_err(&pdev->dev, "error: adc_condition not defined.\n"); > > + goto err_alloc; > > + } > > + data->adc_condition = pdata->adc_condition; > > + > > + /* Check the length of array and set num_conditions */ > > + for (i = 0; data->adc_condition[i].state; i++) > > + ; > > + data->num_conditions = i; > > + > > + data->chan = iio_channel_get(dev_name(&pdev->dev), > > + pdata->consumer_channel); > > + if (IS_ERR(data->chan)) { > > + err = PTR_ERR(data->chan); > > + goto err_alloc; > > + } > > + > > + data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms); > > + > > + INIT_DELAYED_WORK_DEFERRABLE(&data->handler, adc_jack_handler); > > + > > + platform_set_drvdata(pdev, data); > > + > > + err = extcon_dev_register(&data->edev, &pdev->dev); > > + if (err) > > + goto err_initwork; > > + > > + data->irq = platform_get_irq(pdev, 0); > > + > > + err = request_any_context_irq(data->irq, adc_jack_irq_thread, > > + pdata->irq_flags, pdata->name, data); > > + > > + if (err) { > > + dev_err(&pdev->dev, "error: irq %d\n", data->irq); > > + err = -EINVAL; > > + goto err_irq; > > + } > > + > > + goto out; > > + > > +err_irq: > > + extcon_dev_unregister(&data->edev); > > +err_initwork: > > + cancel_delayed_work_sync(&data->handler); > > +err_alloc: > > + kfree(data); > > +out: > > + return err; > > +} > > + > > +static int __devexit adc_jack_remove(struct platform_device *pdev) > > +{ > > + struct adc_jack_data *data = platform_get_drvdata(pdev); > > + > > + extcon_dev_unregister(&data->edev); > > + if (data->irq) > > + free_irq(data->irq, data); > > + > > + return 0; > > +} > > + > > +static struct platform_driver adc_jack_driver = { > > + .probe = adc_jack_probe, > > + .remove = __devexit_p(adc_jack_remove), > > + .driver = { > > + .name = "adc-jack", > > + .owner = THIS_MODULE, > > + }, > > +}; > > + > > +module_platform_driver(adc_jack_driver); > > diff --git a/include/linux/extcon/adc_jack.h b/include/linux/extcon/adc_jack.h > > new file mode 100644 > > index 0000000..ca4d1cd > > --- /dev/null > > +++ b/include/linux/extcon/adc_jack.h > > @@ -0,0 +1,77 @@ > > +/* > > + * include/linux/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. > > + * @cable_names - array of cable names ending with null. If the array itself > > + * if null, extcon standard cable names are chosen. > > + * @adc_contition - array of struct adc_jack_cond conditions ending > > + * with .state = 0 entry. This describes how to decode > > + * adc values into extcon state. > > + * @irq - IRQ number that is triggerred by cable attach/detach > > + * events. If irq = 0, use should manually update extcon state > > + * with extcon APIs. > > + * @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. > > + * @get_adc - the callback to read ADC value to identify cable states. > > + */ > > +struct adc_jack_pdata { > > + const char *name; > > + const char *consumer_channel; > > + /* > > + * NULL if standard extcon names are used. > > + * The last entry should be NULL > > + */ > > + const char **cable_names; > > + /* The last entry's state should be 0 */ > > + struct adc_jack_cond *adc_condition; > > + > > + unsigned long irq_flags; > > + unsigned long handling_delay_ms; /* in ms */ > > + > > + /* When we have ADC subsystem, this can be generalized. */ > > + int (*get_adc)(u32 *value); > > +}; > > + > > +#endif /* _EXTCON_ADC_JACK_H */ > > -- > > 1.7.1 > > > > > > > > > > > > > > > > ^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2012-08-07 5:59 UTC | newest] Thread overview: 2+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2012-08-07 5:57 Re: [PATCH V1]Extcon: adc_jack: adc-jack driver to support 3.5 pi or simliar devices MyungJoo Ham 2012-08-07 5:59 ` anish kumar
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