MIPS: TXx9: IOC LED support

Add leds-gpio platform device for controlling LEDs connected to IOC on
RBTX49XX and JMR3927 board.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 111 insertions, 0 deletions

diff --git a/arch/mips/txx9/generic/setup.c b/arch/mips/txx9/generic/setup.c
index 118d716f7832..1ea06553a1e1 100644
--- a/arch/mips/txx9/generic/setup.c
+++ b/arch/mips/txx9/generic/setup.c
@@ -23,6 +23,7 @@
 #include <linux/platform_device.h>
 #include <linux/serial_core.h>
 #include <linux/mtd/physmap.h>
+#include <linux/leds.h>
 #include <asm/bootinfo.h>
 #include <asm/time.h>
 #include <asm/reboot.h>
@@ -649,3 +650,113 @@ void __init txx9_physmap_flash_init(int no, unsigned long addr,
                 platform_device_put(pdev);
 #endif
 }
+
+#if defined(CONFIG_LEDS_GPIO) || defined(CONFIG_LEDS_GPIO_MODULE)
+static DEFINE_SPINLOCK(txx9_iocled_lock);
+
+#define TXX9_IOCLED_MAXLEDS 8
+
+struct txx9_iocled_data {
+        struct gpio_chip chip;
+        u8 cur_val;
+        void __iomem *mmioaddr;
+        struct gpio_led_platform_data pdata;
+        struct gpio_led leds[TXX9_IOCLED_MAXLEDS];
+        char names[TXX9_IOCLED_MAXLEDS][32];
+};
+
+static int txx9_iocled_get(struct gpio_chip *chip, unsigned int offset)
+{
+        struct txx9_iocled_data *data =
+                container_of(chip, struct txx9_iocled_data, chip);
+        return data->cur_val & (1 << offset);
+}
+
+static void txx9_iocled_set(struct gpio_chip *chip, unsigned int offset,
+                            int value)
+{
+        struct txx9_iocled_data *data =
+                container_of(chip, struct txx9_iocled_data, chip);
+        unsigned long flags;
+        spin_lock_irqsave(&txx9_iocled_lock, flags);
+        if (value)
+                data->cur_val |= 1 << offset;
+        else
+                data->cur_val &= ~(1 << offset);
+        writeb(data->cur_val, data->mmioaddr);
+        mmiowb();
+        spin_unlock_irqrestore(&txx9_iocled_lock, flags);
+}
+
+static int txx9_iocled_dir_in(struct gpio_chip *chip, unsigned int offset)
+{
+        return 0;
+}
+
+static int txx9_iocled_dir_out(struct gpio_chip *chip, unsigned int offset,
+                               int value)
+{
+        txx9_iocled_set(chip, offset, value);
+        return 0;
+}
+
+void __init txx9_iocled_init(unsigned long baseaddr,
+                             int basenum, unsigned int num, int lowactive,
+                             const char *color, char **deftriggers)
+{
+        struct txx9_iocled_data *iocled;
+        struct platform_device *pdev;
+        int i;
+        static char *default_triggers[] __initdata = {
+                "heartbeat",
+                "ide-disk",
+                "nand-disk",
+                NULL,
+        };
+
+        if (!deftriggers)
+                deftriggers = default_triggers;
+        iocled = kzalloc(sizeof(*iocled), GFP_KERNEL);
+        if (!iocled)
+                return;
+        iocled->mmioaddr = ioremap(baseaddr, 1);
+        if (!iocled->mmioaddr)
+                return;
+        iocled->chip.get = txx9_iocled_get;
+        iocled->chip.set = txx9_iocled_set;
+        iocled->chip.direction_input = txx9_iocled_dir_in;
+        iocled->chip.direction_output = txx9_iocled_dir_out;
+        iocled->chip.label = "iocled";
+        iocled->chip.base = basenum;
+        iocled->chip.ngpio = num;
+        if (gpiochip_add(&iocled->chip))
+                return;
+        if (basenum < 0)
+                basenum = iocled->chip.base;
+
+        pdev = platform_device_alloc("leds-gpio", basenum);
+        if (!pdev)
+                return;
+        iocled->pdata.num_leds = num;
+        iocled->pdata.leds = iocled->leds;
+        for (i = 0; i < num; i++) {
+                struct gpio_led *led = &iocled->leds[i];
+                snprintf(iocled->names[i], sizeof(iocled->names[i]),
+                         "iocled:%s:%u", color, i);
+                led->name = iocled->names[i];
+                led->gpio = basenum + i;
+                led->active_low = lowactive;
+                if (deftriggers && *deftriggers)
+                        led->default_trigger = *deftriggers++;
+        }
+        pdev->dev.platform_data = &iocled->pdata;
+        if (platform_device_add(pdev))
+                platform_device_put(pdev);
+}
+#else /* CONFIG_LEDS_GPIO */
+void __init txx9_iocled_init(unsigned long baseaddr,
+                             int basenum, unsigned int num, int lowactive,
+                             const char *color, char **deftriggers)
+{
+}
+#endif /* CONFIG_LEDS_GPIO */