| /* |
| * 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 "../iio.h" |
| #include "../trigger.h" |
| |
| struct bfin_timer { |
| unsigned short id, bit; |
| unsigned long irqbit; |
| int irq; |
| }; |
| |
| /* |
| * 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}, |
| {TIMER1_id, TIMER1bit, TIMER_STATUS_TIMIL1, IRQ_TIMER1}, |
| {TIMER2_id, TIMER2bit, TIMER_STATUS_TIMIL2, IRQ_TIMER2}, |
| #if (MAX_BLACKFIN_GPTIMERS > 3) |
| {TIMER3_id, TIMER3bit, TIMER_STATUS_TIMIL3, IRQ_TIMER3}, |
| {TIMER4_id, TIMER4bit, TIMER_STATUS_TIMIL4, IRQ_TIMER4}, |
| {TIMER5_id, TIMER5bit, TIMER_STATUS_TIMIL5, IRQ_TIMER5}, |
| {TIMER6_id, TIMER6bit, TIMER_STATUS_TIMIL6, IRQ_TIMER6}, |
| {TIMER7_id, TIMER7bit, TIMER_STATUS_TIMIL7, IRQ_TIMER7}, |
| #endif |
| #if (MAX_BLACKFIN_GPTIMERS > 8) |
| {TIMER8_id, TIMER8bit, TIMER_STATUS_TIMIL8, IRQ_TIMER8}, |
| {TIMER9_id, TIMER9bit, TIMER_STATUS_TIMIL9, IRQ_TIMER9}, |
| {TIMER10_id, TIMER10bit, TIMER_STATUS_TIMIL10, IRQ_TIMER10}, |
| #if (MAX_BLACKFIN_GPTIMERS > 11) |
| {TIMER11_id, TIMER11bit, TIMER_STATUS_TIMIL11, IRQ_TIMER11}, |
| #endif |
| #endif |
| }; |
| |
| struct bfin_tmr_state { |
| struct iio_trigger *trig; |
| struct bfin_timer *t; |
| unsigned timer_num; |
| int irq; |
| }; |
| |
| static ssize_t iio_bfin_tmr_frequency_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t count) |
| { |
| struct iio_trigger *trig = dev_get_drvdata(dev); |
| struct bfin_tmr_state *st = trig->private_data; |
| long val; |
| int ret; |
| |
| ret = strict_strtoul(buf, 10, &val); |
| if (ret) |
| goto error_ret; |
| |
| if (val > 100000) { |
| ret = -EINVAL; |
| goto error_ret; |
| } |
| |
| disable_gptimers(st->t->bit); |
| |
| if (!val) |
| goto error_ret; |
| |
| val = get_sclk() / val; |
| if (val <= 4) { |
| ret = -EINVAL; |
| goto error_ret; |
| } |
| |
| set_gptimer_period(st->t->id, val); |
| set_gptimer_pwidth(st->t->id, 1); |
| enable_gptimers(st->t->bit); |
| |
| error_ret: |
| return ret ? ret : count; |
| } |
| |
| static ssize_t iio_bfin_tmr_frequency_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_trigger *trig = dev_get_drvdata(dev); |
| struct bfin_tmr_state *st = trig->private_data; |
| |
| return sprintf(buf, "%lu\n", |
| get_sclk() / get_gptimer_period(st->t->id)); |
| } |
| |
| static DEVICE_ATTR(frequency, S_IRUGO | S_IWUSR, iio_bfin_tmr_frequency_show, |
| iio_bfin_tmr_frequency_store); |
| |
| 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, 0); |
| |
| 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 = { |
| .owner = THIS_MODULE, |
| }; |
| |
| static int __devinit iio_bfin_tmr_trigger_probe(struct platform_device *pdev) |
| { |
| struct bfin_tmr_state *st; |
| int ret; |
| |
| st = kzalloc(sizeof(*st), GFP_KERNEL); |
| if (st == NULL) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| st->irq = platform_get_irq(pdev, 0); |
| if (!st->irq) { |
| dev_err(&pdev->dev, "No IRQs specified"); |
| ret = -ENODEV; |
| goto out1; |
| } |
| |
| ret = iio_bfin_tmr_get_number(st->irq); |
| if (ret < 0) |
| goto out1; |
| |
| st->timer_num = ret; |
| st->t = &iio_bfin_timer_code[st->timer_num]; |
| |
| st->trig = iio_allocate_trigger("bfintmr%d", st->timer_num); |
| if (!st->trig) { |
| ret = -ENOMEM; |
| goto out1; |
| } |
| |
| st->trig->private_data = st; |
| st->trig->ops = &iio_bfin_tmr_trigger_ops; |
| st->trig->dev.groups = iio_bfin_tmr_trigger_attr_groups; |
| ret = iio_trigger_register(st->trig); |
| if (ret) |
| goto out2; |
| |
| 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 out4; |
| } |
| |
| set_gptimer_config(st->t->id, OUT_DIS | PWM_OUT | PERIOD_CNT | IRQ_ENA); |
| |
| dev_info(&pdev->dev, "iio trigger Blackfin TMR%d, IRQ-%d", |
| st->timer_num, st->irq); |
| platform_set_drvdata(pdev, st); |
| |
| return 0; |
| out4: |
| iio_trigger_unregister(st->trig); |
| out2: |
| iio_put_trigger(st->trig); |
| out1: |
| kfree(st); |
| out: |
| return ret; |
| } |
| |
| static int __devexit iio_bfin_tmr_trigger_remove(struct platform_device *pdev) |
| { |
| struct bfin_tmr_state *st = platform_get_drvdata(pdev); |
| |
| disable_gptimers(st->t->bit); |
| free_irq(st->irq, st); |
| iio_trigger_unregister(st->trig); |
| iio_put_trigger(st->trig); |
| kfree(st); |
| |
| return 0; |
| } |
| |
| static struct platform_driver iio_bfin_tmr_trigger_driver = { |
| .driver = { |
| .name = "iio_bfin_tmr_trigger", |
| .owner = THIS_MODULE, |
| }, |
| .probe = iio_bfin_tmr_trigger_probe, |
| .remove = __devexit_p(iio_bfin_tmr_trigger_remove), |
| }; |
| |
| static int __init iio_bfin_tmr_trig_init(void) |
| { |
| return platform_driver_register(&iio_bfin_tmr_trigger_driver); |
| } |
| module_init(iio_bfin_tmr_trig_init); |
| |
| static void __exit iio_bfin_tmr_trig_exit(void) |
| { |
| platform_driver_unregister(&iio_bfin_tmr_trigger_driver); |
| } |
| module_exit(iio_bfin_tmr_trig_exit); |
| |
| 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"); |