/*
* wnr2200-keys.c
*
* Created on: 2014年1月20日
* Author: tao
*/
#include <linux/module.h>
#include <linux/version.h>
#include <linux/kmod.h>
#include <linux/workqueue.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <linux/kobject.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/of_gpio.h>
#include <linux/gpio_keys.h>
#include <asm/mach-ath79/ar71xx_regs.h>
#define DRV_NAME "wnr2200-keys"
#undef BH_DEBUG
#define BH_SKB_SIZE 2048
#ifdef BH_DEBUG
#define BH_DBG(fmt, args...) printk(KERN_DEBUG "%s: " fmt, DRV_NAME, ##args )
#else
#define BH_DBG(fmt, args...) do {} while (0)
#endif
#define BH_ERR(fmt, args...) printk(KERN_ERR "%s: " fmt, DRV_NAME, ##args )
#define WNR2200_GPIO_BUTTON_WIFI 3
#define WNR2200_GPIO_BUTTON_WPS 5
#define WNR2200_GPIO_BUTTON_RESET 6
#define WNR2200_PCI_GPIO_BASE 0x20
#define WNR2200_PCI_GPIO_COUNT 10
#define WNR2200_KEYS_POLL_INTERVAL 20 /* msecs */
#define WNR2200_KEYS_DEBOUNCE_INTERVAL (3 * WNR2200_KEYS_POLL_INTERVAL)
#define AR9287_BASE
AR71XX_PCI_MEM_BASE
#define AR9287_GPIO_IN_OUT 0x4048 // GPIO
input / output register
#define AR9287_GPIO_IN_VAL 0x001FF800
#define AR9287_GPIO_IN_VAL_S 11
#define AR9287_GPIO_OE_OUT 0x404c // GPIO
output enable register
#define AR9287_GPIO_OE_OUT_DRV 0x3 // 2 bit
field mask, shifted by 2*bitpos
#define AR9287_GPIO_OE_OUT_DRV_NO 0x0 // tristate
#define AR9287_GPIO_OE_OUT_DRV_LOW 0x1 // drive if low
#define AR9287_GPIO_OE_OUT_DRV_HI 0x2 // drive if high
#define AR9287_GPIO_OE_OUT_DRV_ALL 0x3 // drive always
#define AR9287_GPIO_OUTPUT_MUX_AS_OUTPUT 0
#define AR9287_GPIO_OUTPUT_MUX_AS_PCIE_ATTENTION_LED 1
#define AR9287_GPIO_OUTPUT_MUX_AS_PCIE_POWER_LED 2
#define AR9287_GPIO_OUTPUT_MUX_AS_TX_FRAME 3
#define AR9287_GPIO_OUTPUT_MUX_AS_RX_CLEAR_EXTERNAL 4
#define AR9287_GPIO_OUTPUT_MUX_AS_MAC_NETWORK_LED 5
#define AR9287_GPIO_OUTPUT_MUX_AS_MAC_POWER_LED 6
#define AR9287_GPIO_OUTPUT_MUX1 0x4060
#define AR9287_GPIO_OUTPUT_MUX2 0x4064
#define AR9287_GPIO_IE_VALUE 0x4054 // GPIO
input enable and value register
#define AR9287_GPIO_BIT(_gpio) (1 << (_gpio))
#define MS(_v, _f) (((_v) & _f) >> _f##_S)
struct bh_priv {
unsigned long seen;
};
struct bh_event {
const char *name;
unsigned int type;
char *action;
unsigned long seen;
struct sk_buff *skb;
struct work_struct work;
};
struct bh_map {
unsigned int code;
const char *name;
};
struct gpio_keys_button_data {
struct delayed_work work;
struct bh_priv bh;
int last_state;
int count;
int threshold;
int can_sleep;
struct gpio_keys_button *b;
};
struct gpio_keys_button_dev {
int polled;
struct delayed_work work;
struct device *dev;
struct gpio_keys_platform_data *pdata;
struct gpio_keys_button_data data[0];
};
void __iomem *ar9287_gpio_base;
extern u64 uevent_next_seqnum(void);
#define BH_MAP(_code, _name) \
{ \
.code = (_code), \
.name = (_name), \
}
static struct bh_map button_map[] = {
BH_MAP(KEY_RESTART, "reset"),
BH_MAP(KEY_RFKILL, "rfkill"),
BH_MAP(KEY_WPS_BUTTON, "wps"),
};
static struct platform_device *wnr2200_key_devs;
static int ar9287_gpio_get_value(struct gpio_chip *chip, unsigned offset)
{
return (MS(__raw_readl(ar9287_gpio_base + AR9287_GPIO_IN_OUT),
AR9287_GPIO_IN_VAL) & AR9287_GPIO_BIT(offset)) != 0;
}
static void ar9287_gpio_set_value(struct gpio_chip *chip,
unsigned offset, int value)
{
unsigned long reg, mask;
reg = __raw_readl(ar9287_gpio_base + AR9287_GPIO_IN_OUT);
mask = ~(1 << offset);
reg &= mask | ((value&1) << offset);
__raw_writel(reg, ar9287_gpio_base + AR9287_GPIO_IN_OUT);
}
static int ar9287_gpio_direction_input(struct gpio_chip *chip,
unsigned offset)
{
/*FIXME*/
return 0;
}
static int ar9287_gpio_direction_output(struct gpio_chip *chip,
unsigned offset, int value)
{
/*FIXME*/
return 0;
}
static struct gpio_chip ar9287_gpio_chip = {
.label = "ar9287-gpio",
.get = ar9287_gpio_get_value,
.set = ar9287_gpio_set_value,
.direction_input = ar9287_gpio_direction_input,
.direction_output = ar9287_gpio_direction_output,
.ngpio = WNR2200_PCI_GPIO_COUNT,
.base = WNR2200_PCI_GPIO_BASE
};
static struct gpio_keys_button wnr2200_gpio_keys[] = {
{
.desc = "rfkill",
.type = EV_KEY,
.code = KEY_RFKILL,
.debounce_interval = WNR2200_KEYS_DEBOUNCE_INTERVAL,
.gpio = 0x20 + WNR2200_GPIO_BUTTON_WIFI,
.active_low = 1,
},
{
.desc = "wps",
.type = EV_KEY,
.code = KEY_WPS_BUTTON,
.debounce_interval = WNR2200_KEYS_DEBOUNCE_INTERVAL,
.gpio = 0x20 + WNR2200_GPIO_BUTTON_WPS,
.active_low = 1,
},
{
.desc = "reset",
.type = EV_KEY,
.code = KEY_RESTART,
.debounce_interval = WNR2200_KEYS_DEBOUNCE_INTERVAL,
.gpio = 0x20 + WNR2200_GPIO_BUTTON_RESET,
.active_low = 1,
}
};
static int bh_event_add_var(struct bh_event *event, int argv,
const char *format, ...)
{
static char buf[128];
char *s;
va_list args;
int len;
if (argv)
return 0;
va_start(args, format);
len = vsnprintf(buf, sizeof(buf), format, args);
va_end(args);
if (len >= sizeof(buf)) {
BH_ERR("buffer size too small\n");
WARN_ON(1);
return -ENOMEM;
}
s = skb_put(event->skb, len + 1);
strcpy(s, buf);
BH_DBG("added variable '%s'\n", s);
return 0;
}
static int button_hotplug_fill_event(struct bh_event *event)
{
int ret;
ret = bh_event_add_var(event, 0, "HOME=%s", "/");
if (ret)
return ret;
ret = bh_event_add_var(event, 0, "PATH=%s",
"/sbin:/bin:/usr/sbin:/usr/bin");
if (ret)
return ret;
ret = bh_event_add_var(event, 0, "SUBSYSTEM=%s", "button");
if (ret)
return ret;
ret = bh_event_add_var(event, 0, "ACTION=%s", event->action);
if (ret)
return ret;
ret = bh_event_add_var(event, 0, "BUTTON=%s", event->name);
if (ret)
return ret;
if (event->type == EV_SW) {
ret = bh_event_add_var(event, 0, "TYPE=%s", "switch");
if (ret)
return ret;
}
ret = bh_event_add_var(event, 0, "SEEN=%ld", event->seen);
if (ret)
return ret;
ret = bh_event_add_var(event, 0, "SEQNUM=%llu", uevent_next_seqnum());
return ret;
}
static void button_hotplug_work(struct work_struct *work)
{
struct bh_event *event = container_of(work, struct bh_event, work);
int ret = 0;
event->skb = alloc_skb(BH_SKB_SIZE, GFP_KERNEL);
if (!event->skb)
goto out_free_event;
ret = bh_event_add_var(event, 0, "%s@", event->action);
if (ret)
goto out_free_skb;
ret = button_hotplug_fill_event(event);
if (ret)
goto out_free_skb;
NETLINK_CB(event->skb).dst_group = 1;
broadcast_uevent(event->skb, 0, 1, GFP_KERNEL);
out_free_skb:
if (ret) {
BH_ERR("work error %d\n", ret);
kfree_skb(event->skb);
}
out_free_event:
kfree(event);
}
static int button_hotplug_create_event(const char *name, unsigned int type,
unsigned long seen, int pressed)
{
struct bh_event *event;
BH_DBG("create event, name=%s, seen=%lu, pressed=%d\n",
name, seen, pressed);
event = kzalloc(sizeof(*event), GFP_KERNEL);
if (!event)
return -ENOMEM;
event->name = name;
event->type = type;
event->seen = seen;
event->action = pressed ? "pressed" : "released";
INIT_WORK(&event->work, (void *)(void *)button_hotplug_work);
schedule_work(&event->work);
return 0;
}
#ifdef CONFIG_HOTPLUG
static int button_get_index(unsigned int code)
{
int i;
for (i = 0; i < ARRAY_SIZE(button_map); i++)
if (button_map[i].code == code)
return i;
return -1;
}
static void button_hotplug_event(struct gpio_keys_button_data *data,
unsigned int type, int value)
{
struct bh_priv *priv = &data->bh;
unsigned long seen = jiffies;
int btn;
BH_DBG("event type=%u, code=%u, value=%d\n", type, data->b->code, value);
if ((type != EV_KEY) && (type != EV_SW))
return;
btn = button_get_index(data->b->code);
if (btn < 0)
return;
button_hotplug_create_event(button_map[btn].name, type,
(seen - priv->seen) / HZ, value);
priv->seen = seen;
}
#else
static void button_hotplug_event(struct gpio_keys_button_data *data,
unsigned int type, int value)
{
}
#endif /* CONFIG_HOTPLUG */
static int gpio_button_get_value(struct gpio_keys_button_data *bdata)
{
int val;
if (bdata->can_sleep)
val = !!gpio_get_value_cansleep(bdata->b->gpio);
else
val = !!gpio_get_value(bdata->b->gpio);
return val ^ bdata->b->active_low;
}
static void gpio_keys_polled_check_state(struct gpio_keys_button_data *bdata)
{
int state = gpio_button_get_value(bdata);
if (state != bdata->last_state) {
unsigned int type = bdata->b->type ?: EV_KEY;
if (bdata->count < bdata->threshold) {
bdata->count++;
return;
}
if ((bdata->last_state != -1) || (type == EV_SW))
button_hotplug_event(bdata, type, state);
bdata->last_state = state;
}
bdata->count = 0;
}
static void gpio_keys_polled_queue_work(struct gpio_keys_button_dev *bdev)
{
struct gpio_keys_platform_data *pdata = bdev->pdata;
unsigned long delay = msecs_to_jiffies(pdata->poll_interval);
if (delay >= HZ)
delay = round_jiffies_relative(delay);
schedule_delayed_work(&bdev->work, delay);
}
static void gpio_keys_polled_poll(struct work_struct *work)
{
struct gpio_keys_button_dev *bdev =
container_of(work, struct gpio_keys_button_dev, work.work);
int i;
for (i = 0; i < bdev->pdata->nbuttons; i++) {
struct gpio_keys_button_data *bdata = &bdev->data[i];
gpio_keys_polled_check_state(bdata);
}
gpio_keys_polled_queue_work(bdev);
}
static void gpio_keys_polled_close(struct gpio_keys_button_dev *bdev)
{
struct gpio_keys_platform_data *pdata = bdev->pdata;
cancel_delayed_work_sync(&bdev->work);
if (pdata->disable)
pdata->disable(bdev->dev);
}
static int gpio_keys_button_probe(struct platform_device *pdev,
struct gpio_keys_button_dev **_bdev, int polled)
{
struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
struct device *dev = &pdev->dev;
struct gpio_keys_button_dev *bdev;
struct gpio_keys_button *buttons;
int error;
int i;
if (polled && !pdata->poll_interval) {
dev_err(dev, "missing poll_interval value\n");
return -EINVAL;
}
buttons = devm_kzalloc(dev, pdata->nbuttons * sizeof(struct
gpio_keys_button),
GFP_KERNEL);
if (!buttons) {
dev_err(dev, "no memory for button data\n");
return -ENOMEM;
}
memcpy(buttons, pdata->buttons, pdata->nbuttons * sizeof(struct
gpio_keys_button));
bdev = devm_kzalloc(dev, sizeof(struct gpio_keys_button_dev) +
pdata->nbuttons * sizeof(struct gpio_keys_button_data),
GFP_KERNEL);
if (!bdev) {
dev_err(dev, "no memory for private data\n");
return -ENOMEM;
}
bdev->polled = polled;
for (i = 0; i < pdata->nbuttons; i++) {
struct gpio_keys_button *button = &buttons[i];
struct gpio_keys_button_data *bdata = &bdev->data[i];
unsigned int gpio = button->gpio;
if (button->wakeup) {
dev_err(dev, DRV_NAME "does not support wakeup\n");
return -EINVAL;
}
error = devm_gpio_request(dev, gpio,
button->desc ? button->desc : DRV_NAME);
if (error) {
dev_err(dev, "unable to claim gpio %u, err=%d\n",
gpio, error);
return error;
}
error = gpio_direction_input(gpio);
if (error) {
dev_err(dev,
"unable to set direction on gpio %u, err=%d\n",
gpio, error);
return error;
}
bdata->can_sleep = gpio_cansleep(gpio);
bdata->last_state = -1;
if (bdev->polled)
bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
pdata->poll_interval);
else
bdata->threshold = 1;
bdata->b = &pdata->buttons[i];
}
bdev->dev = &pdev->dev;
bdev->pdata = pdata;
platform_set_drvdata(pdev, bdev);
*_bdev = bdev;
return 0;
}
static int wnr2200_key_probe(struct platform_device *pdev)
{
struct gpio_keys_platform_data *pdata;
struct gpio_keys_button_dev *bdev;
struct device *dev;
int ret = -1;
int i;
dev = &pdev->dev;
ret = gpio_keys_button_probe(pdev, &bdev, 1);
if (ret) {
dev_err(dev, "gpio_keys_button_probe failed\n");
goto exit;
}
INIT_DELAYED_WORK(&bdev->work, gpio_keys_polled_poll);
pdata = bdev->pdata;
if (pdata->enable)
pdata->enable(bdev->dev);
for (i = 0; i < pdata->nbuttons; i++)
gpio_keys_polled_check_state(&bdev->data[i]);
gpio_keys_polled_queue_work(bdev);
exit:
return ret;
}
static int wnr2200_key_remove(struct platform_device *pdev)
{
struct gpio_keys_button_dev *bdev = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
if (bdev->polled)
gpio_keys_polled_close(bdev);
return 0;
}
static struct platform_driver wnr2200_key_driver = {
.probe = wnr2200_key_probe,
.remove = wnr2200_key_remove,
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(wnr2200_key_of_match),
},
};
static int __init wnr2200_key_init(void)
{
int ret = -1;
struct gpio_keys_platform_data pdata;
ar9287_gpio_base = ioremap_nocache(AR71XX_PCI_MEM_BASE,
AR71XX_PCI_MEM_SIZE);
if (ar9287_gpio_base == NULL) {
printk("ar9287_gpio_base ioremap failed\n");
goto exit1;
}
ret = gpiochip_add(&ar9287_gpio_chip);
if (ret) {
printk("gpiochip_add failed\n");
goto exit2;
}
wnr2200_key_devs = platform_device_alloc(DRV_NAME, -1);
if (!wnr2200_key_devs) {
printk("platform_device_alloc failed\n");
ret = -ENOMEM;
goto exit3;
}
memset(&pdata, 0, sizeof(pdata));
pdata.poll_interval = WNR2200_KEYS_POLL_INTERVAL;
pdata.nbuttons = ARRAY_SIZE(wnr2200_gpio_keys);
pdata.buttons = wnr2200_gpio_keys;
ret = platform_device_add_data(wnr2200_key_devs, &pdata, sizeof(pdata));
if (ret) {
printk("platform_device_add_data failed\n");
goto exit4;
}
ret = platform_device_add(wnr2200_key_devs);
if (ret) {
printk("platform_device_add failed\n");
goto exit4;
}
ret = platform_driver_register(&wnr2200_key_driver);
if (ret == 0) {
return 0;
}
printk("platform_driver_register failed\n");
platform_device_del(wnr2200_key_devs);
exit4:
platform_device_put(wnr2200_key_devs);
exit3:
gpiochip_remove(&ar9287_gpio_chip);
exit2:
iounmap(ar9287_gpio_base);
exit1:
wnr2200_key_devs = NULL;
ar9287_gpio_base = NULL;
return ret;
}
static void __exit wnr2200_key_exit(void)
{
struct platform_device *dev = wnr2200_key_devs;
platform_driver_unregister(&wnr2200_key_driver);
platform_device_unregister(dev);
gpiochip_remove(&ar9287_gpio_chip);
iounmap(ar9287_gpio_base);
ar9287_gpio_base = NULL;
wnr2200_key_devs = NULL;
}
module_init(wnr2200_key_init);
module_exit(wnr2200_key_exit);
MODULE_AUTHOR("Tao Guo <[email protected]>");
MODULE_AUTHOR("Gabor Juhos <[email protected]>");
MODULE_AUTHOR("Felix Fietkau <[email protected]>");
MODULE_DESCRIPTION("WNR2200 keys driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform: " DRV_NAME);
2014-01-25 John Crispin <[email protected]>:
> Hi,
>
> can you post the driver ?
>
> i have a board with AR9287 where one of the gpios is used, would love to
> test your driver
>
> John
>
>
> On 25/01/2014 10:06, 郭涛 wrote:
>> Dear All
>>
>> I wrote a driver for AR9287 GPIO. My module always load before ath9k
>> and cause bus error. The read/write PCI bus operate should after ath9k
>> init the PCI bus.
>>
>> I know I can use modules.dep or modules.softdep, but I can't find it
>> in /lib/modules/xx/ dir.
>>
>> I run `modinfo ath9k`, it show
>> "ath9k_hw,mac80211,ath9k_common,compat,cfg80211,ath", but my module
>> show noting.
>>
>> So, I want to know how to make ath9k as my module's depends ?
>>
>> Thanks
>>
>> BRS
>> _______________________________________________
>> openwrt-devel mailing list
>> [email protected]
>> https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
>>
> _______________________________________________
> openwrt-devel mailing list
> [email protected]
> https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
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