staging: iio: remove iio-trig-bfin-timer driver

The blackfin architecture is getting removed, so the timer trigger
driver is now obsolete. Since this is the last remaining iio trigger
driver in staging, I'm removing the entire directory.
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: NAaron Wu <aaron.wu@analog.com>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

MAINTAINERS

@@ -866,7 +866,6 @@ F:	drivers/iio/*/ad*
 F:	drivers/iio/adc/ltc2497*
 X:	drivers/iio/*/adjd*
 F:	drivers/staging/iio/*/ad*
-F:	drivers/staging/iio/trigger/iio-trig-bfin-timer.c
 
 ANDROID CONFIG FRAGMENTS
 M:	Rob Herring <robh@kernel.org>

drivers/staging/iio/Kconfig

@@ -14,6 +14,5 @@ source "drivers/staging/iio/impedance-analyzer/Kconfig"
 source "drivers/staging/iio/light/Kconfig"
 source "drivers/staging/iio/meter/Kconfig"
 source "drivers/staging/iio/resolver/Kconfig"
-source "drivers/staging/iio/trigger/Kconfig"
 
 endmenu

drivers/staging/iio/Makefile

@@ -13,4 +13,3 @@ obj-y += impedance-analyzer/
 obj-y += light/
 obj-y += meter/
 obj-y += resolver/
-obj-y += trigger/

drivers/staging/iio/trigger/Kconfig

-  #
-# Industrial I/O standalone triggers
-#
-comment "Triggers - standalone"
-
-if IIO_TRIGGER
-
-config IIO_BFIN_TMR_TRIGGER
-	tristate "Blackfin TIMER trigger"
-	depends on BLACKFIN
-	select BFIN_GPTIMERS
-	help
-	  Provides support for using a Blackfin timer as IIO triggers.
-	  If unsure, say N (but it's safe to say "Y").
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called iio-trig-bfin-timer.
-
-endif # IIO_TRIGGER

drivers/staging/iio/trigger/Makefile

-#
-# Makefile for triggers not associated with iio-devices
-#
-
-obj-$(CONFIG_IIO_BFIN_TMR_TRIGGER) += iio-trig-bfin-timer.o

drivers/staging/iio/trigger/iio-trig-bfin-timer.c

-/*
- * Copyright 2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/delay.h>
-
-#include <asm/gptimers.h>
-#include <asm/portmux.h>
-
-#include <linux/iio/iio.h>
-#include <linux/iio/trigger.h>
-
-#include "iio-trig-bfin-timer.h"
-
-struct bfin_timer {
-	unsigned short id, bit;
-	unsigned long irqbit;
-	int irq;
-	int pin;
-};
-
-/*
- * this covers all hardware timer configurations on
- * all Blackfin derivatives out there today
- */
-
-static struct bfin_timer iio_bfin_timer_code[MAX_BLACKFIN_GPTIMERS] = {
-	{TIMER0_id,  TIMER0bit,  TIMER_STATUS_TIMIL0,  IRQ_TIMER0, P_TMR0},
-	{TIMER1_id,  TIMER1bit,  TIMER_STATUS_TIMIL1,  IRQ_TIMER1, P_TMR1},
-	{TIMER2_id,  TIMER2bit,  TIMER_STATUS_TIMIL2,  IRQ_TIMER2, P_TMR2},
-#if (MAX_BLACKFIN_GPTIMERS > 3)
-	{TIMER3_id,  TIMER3bit,  TIMER_STATUS_TIMIL3,  IRQ_TIMER3, P_TMR3},
-	{TIMER4_id,  TIMER4bit,  TIMER_STATUS_TIMIL4,  IRQ_TIMER4, P_TMR4},
-	{TIMER5_id,  TIMER5bit,  TIMER_STATUS_TIMIL5,  IRQ_TIMER5, P_TMR5},
-	{TIMER6_id,  TIMER6bit,  TIMER_STATUS_TIMIL6,  IRQ_TIMER6, P_TMR6},
-	{TIMER7_id,  TIMER7bit,  TIMER_STATUS_TIMIL7,  IRQ_TIMER7, P_TMR7},
-#endif
-#if (MAX_BLACKFIN_GPTIMERS > 8)
-	{TIMER8_id,  TIMER8bit,  TIMER_STATUS_TIMIL8,  IRQ_TIMER8, P_TMR8},
-	{TIMER9_id,  TIMER9bit,  TIMER_STATUS_TIMIL9,  IRQ_TIMER9, P_TMR9},
-	{TIMER10_id, TIMER10bit, TIMER_STATUS_TIMIL10, IRQ_TIMER10, P_TMR10},
-#if (MAX_BLACKFIN_GPTIMERS > 11)
-	{TIMER11_id, TIMER11bit, TIMER_STATUS_TIMIL11, IRQ_TIMER11, P_TMR11},
-#endif
-#endif
-};
-
-struct bfin_tmr_state {
-	struct iio_trigger	*trig;
-	struct bfin_timer	*t;
-	unsigned int		timer_num;
-	bool			output_enable;
-	unsigned int		duty;
-	int			irq;
-};
-
-static int iio_bfin_tmr_set_state(struct iio_trigger *trig, bool state)
-{
-	struct bfin_tmr_state *st = iio_trigger_get_drvdata(trig);
-
-	if (get_gptimer_period(st->t->id) == 0)
-		return -EINVAL;
-
-	if (state)
-		enable_gptimers(st->t->bit);
-	else
-		disable_gptimers(st->t->bit);
-
-	return 0;
-}
-
-static ssize_t frequency_store(struct device *dev,
-			       struct device_attribute *attr,
-			       const char *buf, size_t count)
-{
-	struct iio_trigger *trig = to_iio_trigger(dev);
-	struct bfin_tmr_state *st = iio_trigger_get_drvdata(trig);
-	unsigned int val;
-	bool enabled;
-	int ret;
-
-	ret = kstrtouint(buf, 10, &val);
-	if (ret)
-		return ret;
-
-	if (val > 100000)
-		return -EINVAL;
-
-	enabled = get_enabled_gptimers() & st->t->bit;
-
-	if (enabled)
-		disable_gptimers(st->t->bit);
-
-	if (!val)
-		return count;
-
-	val = get_sclk() / val;
-	if (val <= 4 || val <= st->duty)
-		return -EINVAL;
-
-	set_gptimer_period(st->t->id, val);
-	set_gptimer_pwidth(st->t->id, val - st->duty);
-
-	if (enabled)
-		enable_gptimers(st->t->bit);
-
-	return count;
-}
-
-static ssize_t frequency_show(struct device *dev,
-			      struct device_attribute *attr,
-			      char *buf)
-{
-	struct iio_trigger *trig = to_iio_trigger(dev);
-	struct bfin_tmr_state *st = iio_trigger_get_drvdata(trig);
-	unsigned int period = get_gptimer_period(st->t->id);
-	unsigned long val;
-
-	if (!period)
-		val = 0;
-	else
-		val = get_sclk() / get_gptimer_period(st->t->id);
-
-	return sprintf(buf, "%lu\n", val);
-}
-
-static DEVICE_ATTR_RW(frequency);
-
-static struct attribute *iio_bfin_tmr_trigger_attrs[] = {
-	&dev_attr_frequency.attr,
-	NULL,
-};
-
-static const struct attribute_group iio_bfin_tmr_trigger_attr_group = {
-	.attrs = iio_bfin_tmr_trigger_attrs,
-};
-
-static const struct attribute_group *iio_bfin_tmr_trigger_attr_groups[] = {
-	&iio_bfin_tmr_trigger_attr_group,
-	NULL
-};
-
-static irqreturn_t iio_bfin_tmr_trigger_isr(int irq, void *devid)
-{
-	struct bfin_tmr_state *st = devid;
-
-	clear_gptimer_intr(st->t->id);
-	iio_trigger_poll(st->trig);
-
-	return IRQ_HANDLED;
-}
-
-static int iio_bfin_tmr_get_number(int irq)
-{
-	int i;
-
-	for (i = 0; i < MAX_BLACKFIN_GPTIMERS; i++)
-		if (iio_bfin_timer_code[i].irq == irq)
-			return i;
-
-	return -ENODEV;
-}
-
-static const struct iio_trigger_ops iio_bfin_tmr_trigger_ops = {
-	.set_trigger_state = iio_bfin_tmr_set_state,
-};
-
-static int iio_bfin_tmr_trigger_probe(struct platform_device *pdev)
-{
-	struct iio_bfin_timer_trigger_pdata *pdata;
-	struct bfin_tmr_state *st;
-	unsigned int config;
-	int ret;
-
-	st = devm_kzalloc(&pdev->dev, sizeof(*st), GFP_KERNEL);
-	if (!st)
-		return -ENOMEM;
-
-	st->irq = platform_get_irq(pdev, 0);
-	if (st->irq < 0) {
-		dev_err(&pdev->dev, "No IRQs specified");
-		return st->irq;
-	}
-
-	ret = iio_bfin_tmr_get_number(st->irq);
-	if (ret < 0)
-		return ret;
-
-	st->timer_num = ret;
-	st->t = &iio_bfin_timer_code[st->timer_num];
-
-	st->trig = iio_trigger_alloc("bfintmr%d", st->timer_num);
-	if (!st->trig)
-		return -ENOMEM;
-
-	st->trig->ops = &iio_bfin_tmr_trigger_ops;
-	st->trig->dev.groups = iio_bfin_tmr_trigger_attr_groups;
-	iio_trigger_set_drvdata(st->trig, st);
-	ret = iio_trigger_register(st->trig);
-	if (ret)
-		goto out;
-
-	ret = request_irq(st->irq, iio_bfin_tmr_trigger_isr,
-			  0, st->trig->name, st);
-	if (ret) {
-		dev_err(&pdev->dev,
-			"request IRQ-%d failed", st->irq);
-		goto out1;
-	}
-
-	config = PWM_OUT | PERIOD_CNT | IRQ_ENA;
-
-	pdata =	dev_get_platdata(&pdev->dev);
-	if (pdata && pdata->output_enable) {
-		unsigned long long val;
-
-		st->output_enable = true;
-
-		ret = peripheral_request(st->t->pin, st->trig->name);
-		if (ret)
-			goto out_free_irq;
-
-		val = (unsigned long long)get_sclk() * pdata->duty_ns;
-		do_div(val, NSEC_PER_SEC);
-		st->duty = val;
-
-		/**
-		 * The interrupt will be generated at the end of the period,
-		 * since we want the interrupt to be generated at end of the
-		 * pulse we invert both polarity and duty cycle, so that the
-		 * pulse will be generated directly before the interrupt.
-		 */
-		if (pdata->active_low)
-			config |= PULSE_HI;
-	} else {
-		st->duty = 1;
-		config |= OUT_DIS;
-	}
-
-	set_gptimer_config(st->t->id, config);
-
-	dev_info(&pdev->dev, "iio trigger Blackfin TMR%d, IRQ-%d",
-		 st->timer_num, st->irq);
-	platform_set_drvdata(pdev, st);
-
-	return 0;
-out_free_irq:
-	free_irq(st->irq, st);
-out1:
-	iio_trigger_unregister(st->trig);
-out:
-	iio_trigger_free(st->trig);
-	return ret;
-}
-
-static int iio_bfin_tmr_trigger_remove(struct platform_device *pdev)
-{
-	struct bfin_tmr_state *st = platform_get_drvdata(pdev);
-
-	disable_gptimers(st->t->bit);
-	if (st->output_enable)
-		peripheral_free(st->t->pin);
-	free_irq(st->irq, st);
-	iio_trigger_unregister(st->trig);
-	iio_trigger_free(st->trig);
-
-	return 0;
-}
-
-static struct platform_driver iio_bfin_tmr_trigger_driver = {
-	.driver = {
-		.name = "iio_bfin_tmr_trigger",
-	},
-	.probe = iio_bfin_tmr_trigger_probe,
-	.remove = iio_bfin_tmr_trigger_remove,
-};
-
-module_platform_driver(iio_bfin_tmr_trigger_driver);
-
-MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
-MODULE_DESCRIPTION("Blackfin system timer based trigger for the iio subsystem");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:iio-trig-bfin-timer");

drivers/staging/iio/trigger/iio-trig-bfin-timer.h

-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __IIO_BFIN_TIMER_TRIGGER_H__
-#define __IIO_BFIN_TIMER_TRIGGER_H__
-
-/**
- * struct iio_bfin_timer_trigger_pdata - timer trigger platform data
- * @output_enable: Enable external trigger pulse generation.
- * @active_low: Whether the trigger pulse is active low.
- * @duty_ns: Length of the trigger pulse in nanoseconds.
- *
- * This struct is used to configure the output pulse generation of the blackfin
- * timer trigger. If output_enable is set to true an external trigger signal
- * will generated on the pin corresponding to the timer. This is useful for
- * converters which needs an external signal to start conversion. active_low and
- * duty_ns are used to configure the type of the trigger pulse. If output_enable
- * is set to false no external trigger pulse will be generated and active_low
- * and duty_ns are ignored.
- **/
-struct iio_bfin_timer_trigger_pdata {
-	bool output_enable;
-	bool active_low;
-	unsigned int duty_ns;
-};
-
-#endif