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