mirror of https://github.com/hak5/openwrt.git
307 lines
8.1 KiB
Diff
307 lines
8.1 KiB
Diff
From 9de00286e20a5f5edc419698373010f1cb6ff0ce Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Sun, 27 Jul 2014 09:25:02 +0100
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Subject: [PATCH 19/57] MIPS: ralink: add pseudo pwm led trigger based on
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timer0
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Signed-off-by: John Crispin <blogic@openwrt.org>
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---
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arch/mips/ralink/timer.c | 213 ++++++++++++++++++++++++++++++++++++++++++----
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1 file changed, 197 insertions(+), 16 deletions(-)
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diff --git a/arch/mips/ralink/timer.c b/arch/mips/ralink/timer.c
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index e38692a..a71a7cb 100644
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--- a/arch/mips/ralink/timer.c
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+++ b/arch/mips/ralink/timer.c
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@@ -12,6 +12,8 @@
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#include <linux/timer.h>
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#include <linux/of_gpio.h>
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#include <linux/clk.h>
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+#include <linux/leds.h>
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+#include <linux/slab.h>
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#include <asm/mach-ralink/ralink_regs.h>
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@@ -23,16 +25,34 @@
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#define TMR0CTL_ENABLE BIT(7)
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#define TMR0CTL_MODE_PERIODIC BIT(4)
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-#define TMR0CTL_PRESCALER 1
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+#define TMR0CTL_PRESCALER 2
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#define TMR0CTL_PRESCALE_VAL (0xf - TMR0CTL_PRESCALER)
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#define TMR0CTL_PRESCALE_DIV (65536 / BIT(TMR0CTL_PRESCALER))
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+struct rt_timer_gpio {
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+ struct list_head list;
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+ struct led_classdev *led;
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+};
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+
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struct rt_timer {
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- struct device *dev;
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- void __iomem *membase;
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- int irq;
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- unsigned long timer_freq;
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- unsigned long timer_div;
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+ struct device *dev;
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+ void __iomem *membase;
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+ int irq;
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+
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+ unsigned long timer_freq;
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+ unsigned long timer_div;
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+
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+ struct list_head gpios;
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+ struct led_trigger led_trigger;
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+ unsigned int duty_cycle;
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+ unsigned int duty;
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+
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+ unsigned int fade;
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+ unsigned int fade_min;
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+ unsigned int fade_max;
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+ unsigned int fade_speed;
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+ unsigned int fade_dir;
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+ unsigned int fade_count;
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};
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static inline void rt_timer_w32(struct rt_timer *rt, u8 reg, u32 val)
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@@ -48,18 +68,46 @@ static inline u32 rt_timer_r32(struct rt_timer *rt, u8 reg)
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static irqreturn_t rt_timer_irq(int irq, void *_rt)
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{
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struct rt_timer *rt = (struct rt_timer *) _rt;
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+ struct rt_timer_gpio *gpio;
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+ unsigned int val;
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- rt_timer_w32(rt, TIMER_REG_TMR0LOAD, rt->timer_freq / rt->timer_div);
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+ if (rt->fade && (rt->fade_count++ > rt->fade_speed)) {
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+ rt->fade_count = 0;
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+ if (rt->duty_cycle <= rt->fade_min)
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+ rt->fade_dir = 1;
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+ else if (rt->duty_cycle >= rt->fade_max)
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+ rt->fade_dir = 0;
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+
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+ if (rt->fade_dir)
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+ rt->duty_cycle += 1;
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+ else
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+ rt->duty_cycle -= 1;
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+
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+ }
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+
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+ val = rt->timer_freq / rt->timer_div;
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+ if (rt->duty)
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+ val *= rt->duty_cycle;
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+ else
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+ val *= (100 - rt->duty_cycle);
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+ val /= 100;
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+
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+ if (!list_empty(&rt->gpios))
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+ list_for_each_entry(gpio, &rt->gpios, list)
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+ led_set_brightness(gpio->led, !!rt->duty);
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+
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+ rt->duty = !rt->duty;
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+
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+ rt_timer_w32(rt, TIMER_REG_TMR0LOAD, val + 1);
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rt_timer_w32(rt, TIMER_REG_TMRSTAT, TMRSTAT_TMR0INT);
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return IRQ_HANDLED;
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}
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-
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static int rt_timer_request(struct rt_timer *rt)
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{
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- int err = request_irq(rt->irq, rt_timer_irq, IRQF_DISABLED,
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- dev_name(rt->dev), rt);
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+ int err = devm_request_irq(rt->dev, rt->irq, rt_timer_irq,
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+ IRQF_DISABLED, dev_name(rt->dev), rt);
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if (err) {
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dev_err(rt->dev, "failed to request irq\n");
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} else {
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@@ -81,8 +129,6 @@ static int rt_timer_config(struct rt_timer *rt, unsigned long divisor)
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else
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rt->timer_div = divisor;
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- rt_timer_w32(rt, TIMER_REG_TMR0LOAD, rt->timer_freq / rt->timer_div);
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-
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return 0;
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}
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@@ -108,11 +154,128 @@ static void rt_timer_disable(struct rt_timer *rt)
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rt_timer_w32(rt, TIMER_REG_TMR0CTL, t);
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}
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+static ssize_t led_fade_show(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
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+ struct rt_timer *rt = container_of(led_cdev->trigger, struct rt_timer, led_trigger);
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+
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+ return sprintf(buf, "speed: %d, min: %d, max: %d\n", rt->fade_speed, rt->fade_min, rt->fade_max);
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+}
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+
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+static ssize_t led_fade_store(struct device *dev,
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+ struct device_attribute *attr, const char *buf, size_t size)
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+{
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+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
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+ struct rt_timer *rt = container_of(led_cdev->trigger, struct rt_timer, led_trigger);
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+ unsigned int speed = 0, min = 0, max = 0;
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+ ssize_t ret = -EINVAL;
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+
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+ ret = sscanf(buf, "%u %u %u", &speed, &min, &max);
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+
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+ if (ret == 3) {
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+ rt->fade_speed = speed;
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+ rt->fade_min = min;
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+ rt->fade_max = max;
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+ rt->fade = 1;
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+ } else {
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+ rt->fade = 0;
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+ }
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+
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+ return size;
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+}
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+
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+static DEVICE_ATTR(fade, 0644, led_fade_show, led_fade_store);
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+
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+static ssize_t led_duty_cycle_show(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
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+ struct rt_timer *rt = container_of(led_cdev->trigger, struct rt_timer, led_trigger);
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+
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+ return sprintf(buf, "%u\n", rt->duty_cycle);
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+}
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+
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+static ssize_t led_duty_cycle_store(struct device *dev,
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+ struct device_attribute *attr, const char *buf, size_t size)
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+{
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+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
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+ struct rt_timer *rt = container_of(led_cdev->trigger, struct rt_timer, led_trigger);
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+ unsigned long state;
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+ ssize_t ret = -EINVAL;
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+
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+ ret = kstrtoul(buf, 10, &state);
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+ if (ret)
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+ return ret;
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+
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+ if (state <= 100)
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+ rt->duty_cycle = state;
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+ else
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+ rt->duty_cycle = 100;
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+
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+ rt->fade = 0;
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+
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+ return size;
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+}
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+
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+static DEVICE_ATTR(duty_cycle, 0644, led_duty_cycle_show, led_duty_cycle_store);
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+
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+static void rt_timer_trig_activate(struct led_classdev *led_cdev)
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+{
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+ struct rt_timer *rt = container_of(led_cdev->trigger, struct rt_timer, led_trigger);
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+ struct rt_timer_gpio *gpio_data;
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+ int rc;
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+
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+ led_cdev->trigger_data = NULL;
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+ gpio_data = kzalloc(sizeof(*gpio_data), GFP_KERNEL);
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+ if (!gpio_data)
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+ return;
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+
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+ rc = device_create_file(led_cdev->dev, &dev_attr_duty_cycle);
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+ if (rc)
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+ goto err_gpio;
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+ rc = device_create_file(led_cdev->dev, &dev_attr_fade);
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+ if (rc)
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+ goto err_out_duty_cycle;
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+
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+ led_cdev->activated = true;
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+ led_cdev->trigger_data = gpio_data;
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+ gpio_data->led = led_cdev;
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+ list_add(&gpio_data->list, &rt->gpios);
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+ led_cdev->trigger_data = gpio_data;
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+ rt_timer_enable(rt);
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+ return;
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+
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+err_out_duty_cycle:
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+ device_remove_file(led_cdev->dev, &dev_attr_duty_cycle);
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+
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+err_gpio:
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+ kfree(gpio_data);
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+}
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+
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+static void rt_timer_trig_deactivate(struct led_classdev *led_cdev)
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+{
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+ struct rt_timer *rt = container_of(led_cdev->trigger, struct rt_timer, led_trigger);
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+ struct rt_timer_gpio *gpio_data = (struct rt_timer_gpio*) led_cdev->trigger_data;
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+
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+ if (led_cdev->activated) {
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+ device_remove_file(led_cdev->dev, &dev_attr_duty_cycle);
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+ device_remove_file(led_cdev->dev, &dev_attr_fade);
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+ led_cdev->activated = false;
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+ }
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+
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+ list_del(&gpio_data->list);
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+ rt_timer_disable(rt);
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+ led_set_brightness(led_cdev, LED_OFF);
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+}
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+
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static int rt_timer_probe(struct platform_device *pdev)
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{
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struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ const __be32 *divisor;
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struct rt_timer *rt;
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struct clk *clk;
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+ int ret;
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rt = devm_kzalloc(&pdev->dev, sizeof(*rt), GFP_KERNEL);
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if (!rt) {
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@@ -140,12 +303,29 @@ static int rt_timer_probe(struct platform_device *pdev)
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if (!rt->timer_freq)
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return -EINVAL;
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+ rt->duty_cycle = 100;
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rt->dev = &pdev->dev;
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platform_set_drvdata(pdev, rt);
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- rt_timer_request(rt);
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- rt_timer_config(rt, 2);
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- rt_timer_enable(rt);
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+ ret = rt_timer_request(rt);
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+ if (ret)
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+ return ret;
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+
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+ divisor = of_get_property(pdev->dev.of_node, "ralink,divisor", NULL);
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+ if (divisor)
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+ rt_timer_config(rt, be32_to_cpu(*divisor));
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+ else
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+ rt_timer_config(rt, 200);
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+
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+ rt->led_trigger.name = "pwmtimer",
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+ rt->led_trigger.activate = rt_timer_trig_activate,
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+ rt->led_trigger.deactivate = rt_timer_trig_deactivate,
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+
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+ ret = led_trigger_register(&rt->led_trigger);
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+ if (ret)
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+ return ret;
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+
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+ INIT_LIST_HEAD(&rt->gpios);
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dev_info(&pdev->dev, "maximum frequency is %luHz\n", rt->timer_freq);
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@@ -156,6 +336,7 @@ static int rt_timer_remove(struct platform_device *pdev)
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{
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struct rt_timer *rt = platform_get_drvdata(pdev);
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+ led_trigger_unregister(&rt->led_trigger);
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rt_timer_disable(rt);
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rt_timer_free(rt);
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@@ -180,6 +361,6 @@ static struct platform_driver rt_timer_driver = {
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module_platform_driver(rt_timer_driver);
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-MODULE_DESCRIPTION("Ralink RT2880 timer");
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+MODULE_DESCRIPTION("Ralink RT2880 timer / pseudo pwm");
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MODULE_AUTHOR("John Crispin <blogic@openwrt.org");
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MODULE_LICENSE("GPL");
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--
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1.7.10.4
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