dc6ed26dc3
Functions like devm_kzalloc, kmalloc_array, devm_ioremap, usb_alloc_urb, alloc_netdev return NULL as a return value on failure. Generally, When NULL represents failure, !x is commonly used. This patch cleans up the tests on the results of these functions, thereby using !x instead of x == NULL or NULL == x. This is done via following coccinelle script: @prob_7@ identifier x; statement S; @@ ( x = devm_kzalloc(...); | x = usb_alloc_urb(...); | x = kmalloc_array(...); | x = devm_ioremap(...); | x = alloc_netdev(...); ) ... - if(NULL == x) + if(!x) S Further we have used isomorphism characteristics of coccinelle to indicate x == NULL and NULL == x are equivalent. This is done via following iso script. Expression @ is_null @ expression X; @@ X == NULL <=> NULL == X Signed-off-by: Somya Anand <somyaanand214@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
293 lines
6.8 KiB
C
293 lines
6.8 KiB
C
/*
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* Copyright 2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/delay.h>
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#include <asm/gptimers.h>
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#include <asm/portmux.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/trigger.h>
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#include "iio-trig-bfin-timer.h"
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struct bfin_timer {
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unsigned short id, bit;
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unsigned long irqbit;
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int irq;
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int pin;
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};
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/*
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* this covers all hardware timer configurations on
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* all Blackfin derivatives out there today
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*/
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static struct bfin_timer iio_bfin_timer_code[MAX_BLACKFIN_GPTIMERS] = {
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{TIMER0_id, TIMER0bit, TIMER_STATUS_TIMIL0, IRQ_TIMER0, P_TMR0},
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{TIMER1_id, TIMER1bit, TIMER_STATUS_TIMIL1, IRQ_TIMER1, P_TMR1},
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{TIMER2_id, TIMER2bit, TIMER_STATUS_TIMIL2, IRQ_TIMER2, P_TMR2},
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#if (MAX_BLACKFIN_GPTIMERS > 3)
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{TIMER3_id, TIMER3bit, TIMER_STATUS_TIMIL3, IRQ_TIMER3, P_TMR3},
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{TIMER4_id, TIMER4bit, TIMER_STATUS_TIMIL4, IRQ_TIMER4, P_TMR4},
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{TIMER5_id, TIMER5bit, TIMER_STATUS_TIMIL5, IRQ_TIMER5, P_TMR5},
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{TIMER6_id, TIMER6bit, TIMER_STATUS_TIMIL6, IRQ_TIMER6, P_TMR6},
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{TIMER7_id, TIMER7bit, TIMER_STATUS_TIMIL7, IRQ_TIMER7, P_TMR7},
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#endif
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#if (MAX_BLACKFIN_GPTIMERS > 8)
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{TIMER8_id, TIMER8bit, TIMER_STATUS_TIMIL8, IRQ_TIMER8, P_TMR8},
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{TIMER9_id, TIMER9bit, TIMER_STATUS_TIMIL9, IRQ_TIMER9, P_TMR9},
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{TIMER10_id, TIMER10bit, TIMER_STATUS_TIMIL10, IRQ_TIMER10, P_TMR10},
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#if (MAX_BLACKFIN_GPTIMERS > 11)
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{TIMER11_id, TIMER11bit, TIMER_STATUS_TIMIL11, IRQ_TIMER11, P_TMR11},
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#endif
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#endif
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};
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struct bfin_tmr_state {
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struct iio_trigger *trig;
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struct bfin_timer *t;
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unsigned timer_num;
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bool output_enable;
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unsigned int duty;
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int irq;
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};
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static int iio_bfin_tmr_set_state(struct iio_trigger *trig, bool state)
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{
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struct bfin_tmr_state *st = iio_trigger_get_drvdata(trig);
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if (get_gptimer_period(st->t->id) == 0)
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return -EINVAL;
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if (state)
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enable_gptimers(st->t->bit);
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else
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disable_gptimers(st->t->bit);
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return 0;
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}
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static ssize_t iio_bfin_tmr_frequency_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct iio_trigger *trig = to_iio_trigger(dev);
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struct bfin_tmr_state *st = iio_trigger_get_drvdata(trig);
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unsigned int val;
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bool enabled;
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int ret;
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ret = kstrtouint(buf, 10, &val);
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if (ret)
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return ret;
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if (val > 100000)
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return -EINVAL;
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enabled = get_enabled_gptimers() & st->t->bit;
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if (enabled)
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disable_gptimers(st->t->bit);
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if (val == 0)
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return count;
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val = get_sclk() / val;
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if (val <= 4 || val <= st->duty)
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return -EINVAL;
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set_gptimer_period(st->t->id, val);
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set_gptimer_pwidth(st->t->id, val - st->duty);
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if (enabled)
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enable_gptimers(st->t->bit);
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return count;
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}
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static ssize_t iio_bfin_tmr_frequency_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_trigger *trig = to_iio_trigger(dev);
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struct bfin_tmr_state *st = iio_trigger_get_drvdata(trig);
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unsigned int period = get_gptimer_period(st->t->id);
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unsigned long val;
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if (period == 0)
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val = 0;
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else
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val = get_sclk() / get_gptimer_period(st->t->id);
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return sprintf(buf, "%lu\n", val);
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}
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static DEVICE_ATTR(frequency, S_IRUGO | S_IWUSR, iio_bfin_tmr_frequency_show,
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iio_bfin_tmr_frequency_store);
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static struct attribute *iio_bfin_tmr_trigger_attrs[] = {
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&dev_attr_frequency.attr,
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NULL,
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};
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static const struct attribute_group iio_bfin_tmr_trigger_attr_group = {
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.attrs = iio_bfin_tmr_trigger_attrs,
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};
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static const struct attribute_group *iio_bfin_tmr_trigger_attr_groups[] = {
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&iio_bfin_tmr_trigger_attr_group,
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NULL
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};
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static irqreturn_t iio_bfin_tmr_trigger_isr(int irq, void *devid)
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{
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struct bfin_tmr_state *st = devid;
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clear_gptimer_intr(st->t->id);
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iio_trigger_poll(st->trig);
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return IRQ_HANDLED;
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}
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static int iio_bfin_tmr_get_number(int irq)
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{
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int i;
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for (i = 0; i < MAX_BLACKFIN_GPTIMERS; i++)
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if (iio_bfin_timer_code[i].irq == irq)
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return i;
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return -ENODEV;
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}
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static const struct iio_trigger_ops iio_bfin_tmr_trigger_ops = {
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.owner = THIS_MODULE,
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.set_trigger_state = iio_bfin_tmr_set_state,
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};
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static int iio_bfin_tmr_trigger_probe(struct platform_device *pdev)
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{
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struct iio_bfin_timer_trigger_pdata *pdata = pdev->dev.platform_data;
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struct bfin_tmr_state *st;
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unsigned int config;
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int ret;
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st = devm_kzalloc(&pdev->dev, sizeof(*st), GFP_KERNEL);
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if (!st)
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return -ENOMEM;
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st->irq = platform_get_irq(pdev, 0);
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if (!st->irq) {
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dev_err(&pdev->dev, "No IRQs specified");
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return -ENODEV;
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}
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ret = iio_bfin_tmr_get_number(st->irq);
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if (ret < 0)
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return ret;
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st->timer_num = ret;
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st->t = &iio_bfin_timer_code[st->timer_num];
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st->trig = iio_trigger_alloc("bfintmr%d", st->timer_num);
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if (!st->trig)
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return -ENOMEM;
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st->trig->ops = &iio_bfin_tmr_trigger_ops;
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st->trig->dev.groups = iio_bfin_tmr_trigger_attr_groups;
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iio_trigger_set_drvdata(st->trig, st);
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ret = iio_trigger_register(st->trig);
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if (ret)
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goto out;
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ret = request_irq(st->irq, iio_bfin_tmr_trigger_isr,
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0, st->trig->name, st);
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if (ret) {
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dev_err(&pdev->dev,
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"request IRQ-%d failed", st->irq);
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goto out1;
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}
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config = PWM_OUT | PERIOD_CNT | IRQ_ENA;
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if (pdata && pdata->output_enable) {
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unsigned long long val;
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st->output_enable = true;
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ret = peripheral_request(st->t->pin, st->trig->name);
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if (ret)
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goto out_free_irq;
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val = (unsigned long long)get_sclk() * pdata->duty_ns;
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do_div(val, NSEC_PER_SEC);
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st->duty = val;
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/**
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* The interrupt will be generated at the end of the period,
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* since we want the interrupt to be generated at end of the
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* pulse we invert both polarity and duty cycle, so that the
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* pulse will be generated directly before the interrupt.
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*/
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if (pdata->active_low)
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config |= PULSE_HI;
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} else {
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st->duty = 1;
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config |= OUT_DIS;
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}
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set_gptimer_config(st->t->id, config);
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dev_info(&pdev->dev, "iio trigger Blackfin TMR%d, IRQ-%d",
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st->timer_num, st->irq);
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platform_set_drvdata(pdev, st);
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return 0;
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out_free_irq:
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free_irq(st->irq, st);
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out1:
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iio_trigger_unregister(st->trig);
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out:
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iio_trigger_put(st->trig);
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return ret;
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}
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static int iio_bfin_tmr_trigger_remove(struct platform_device *pdev)
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{
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struct bfin_tmr_state *st = platform_get_drvdata(pdev);
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disable_gptimers(st->t->bit);
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if (st->output_enable)
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peripheral_free(st->t->pin);
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free_irq(st->irq, st);
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iio_trigger_unregister(st->trig);
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iio_trigger_put(st->trig);
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return 0;
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}
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static struct platform_driver iio_bfin_tmr_trigger_driver = {
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.driver = {
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.name = "iio_bfin_tmr_trigger",
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},
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.probe = iio_bfin_tmr_trigger_probe,
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.remove = iio_bfin_tmr_trigger_remove,
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};
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module_platform_driver(iio_bfin_tmr_trigger_driver);
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MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
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MODULE_DESCRIPTION("Blackfin system timer based trigger for the iio subsystem");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:iio-trig-bfin-timer");
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