1 files changed, 341 insertions, 0 deletions

diff --git a/drivers/leds/leds-wm831x-status.c b/drivers/leds/leds-wm831x-status.c
new file mode 100644
index 000000000000..c586d05e336a
--- /dev/null
+++ b/drivers/leds/leds-wm831x-status.c
@@ -0,0 +1,341 @@
+/*
+ * LED driver for WM831x status LEDs
+ *
+ * Copyright(C) 2009 Wolfson Microelectronics PLC.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/err.h>
+#include <linux/mfd/wm831x/core.h>
+#include <linux/mfd/wm831x/pdata.h>
+#include <linux/mfd/wm831x/status.h>
+
+
+struct wm831x_status {
+        struct led_classdev cdev;
+        struct wm831x *wm831x;
+        struct work_struct work;
+        struct mutex mutex;
+
+        spinlock_t value_lock;
+        int reg;     /* Control register */
+        int reg_val; /* Control register value */
+
+        int blink;
+        int blink_time;
+        int blink_cyc;
+        int src;
+        enum led_brightness brightness;
+};
+
+#define to_wm831x_status(led_cdev) \
+        container_of(led_cdev, struct wm831x_status, cdev)
+
+static void wm831x_status_work(struct work_struct *work)
+{
+        struct wm831x_status *led = container_of(work, struct wm831x_status,
+                                                 work);
+        unsigned long flags;
+
+        mutex_lock(&led->mutex);
+
+        led->reg_val &= ~(WM831X_LED_SRC_MASK | WM831X_LED_MODE_MASK |
+                          WM831X_LED_DUTY_CYC_MASK | WM831X_LED_DUR_MASK);
+
+        spin_lock_irqsave(&led->value_lock, flags);
+
+        led->reg_val |= led->src << WM831X_LED_SRC_SHIFT;
+        if (led->blink) {
+                led->reg_val |= 2 << WM831X_LED_MODE_SHIFT;
+                led->reg_val |= led->blink_time << WM831X_LED_DUR_SHIFT;
+                led->reg_val |= led->blink_cyc;
+        } else {
+                if (led->brightness != LED_OFF)
+                        led->reg_val |= 1 << WM831X_LED_MODE_SHIFT;
+        }
+
+        spin_unlock_irqrestore(&led->value_lock, flags);
+
+        wm831x_reg_write(led->wm831x, led->reg, led->reg_val);
+
+        mutex_unlock(&led->mutex);
+}
+
+static void wm831x_status_set(struct led_classdev *led_cdev,
+                           enum led_brightness value)
+{
+        struct wm831x_status *led = to_wm831x_status(led_cdev);
+        unsigned long flags;
+
+        spin_lock_irqsave(&led->value_lock, flags);
+        led->brightness = value;
+        if (value == LED_OFF)
+                led->blink = 0;
+        schedule_work(&led->work);
+        spin_unlock_irqrestore(&led->value_lock, flags);
+}
+
+static int wm831x_status_blink_set(struct led_classdev *led_cdev,
+                                   unsigned long *delay_on,
+                                   unsigned long *delay_off)
+{
+        struct wm831x_status *led = to_wm831x_status(led_cdev);
+        unsigned long flags;
+        int ret = 0;
+
+        /* Pick some defaults if we've not been given times */
+        if (*delay_on == 0 && *delay_off == 0) {
+                *delay_on = 250;
+                *delay_off = 250;
+        }
+
+        spin_lock_irqsave(&led->value_lock, flags);
+
+        /* We only have a limited selection of settings, see if we can
+         * support the configuration we're being given */
+        switch (*delay_on) {
+        case 1000:
+                led->blink_time = 0;
+                break;
+        case 250:
+                led->blink_time = 1;
+                break;
+        case 125:
+                led->blink_time = 2;
+                break;
+        case 62:
+        case 63:
+                /* Actually 62.5ms */
+                led->blink_time = 3;
+                break;
+        default:
+                ret = -EINVAL;
+                break;
+        }
+
+        if (ret == 0) {
+                switch (*delay_off / *delay_on) {
+                case 1:
+                        led->blink_cyc = 0;
+                        break;
+                case 3:
+                        led->blink_cyc = 1;
+                        break;
+                case 4:
+                        led->blink_cyc = 2;
+                        break;
+                case 8:
+                        led->blink_cyc = 3;
+                        break;
+                default:
+                        ret = -EINVAL;
+                        break;
+                }
+        }
+
+        if (ret == 0)
+                led->blink = 1;
+        else
+                led->blink = 0;
+
+        /* Always update; if we fail turn off blinking since we expect
+         * a software fallback. */
+        schedule_work(&led->work);
+
+        spin_unlock_irqrestore(&led->value_lock, flags);
+
+        return ret;
+}
+
+static const char *led_src_texts[] = {
+        "otp",
+        "power",
+        "charger",
+        "soft",
+};
+
+static ssize_t wm831x_status_src_show(struct device *dev,
+                                      struct device_attribute *attr, char *buf)
+{
+        struct led_classdev *led_cdev = dev_get_drvdata(dev);
+        struct wm831x_status *led = to_wm831x_status(led_cdev);
+        int i;
+        ssize_t ret = 0;
+
+        mutex_lock(&led->mutex);
+
+        for (i = 0; i < ARRAY_SIZE(led_src_texts); i++)
+                if (i == led->src)
+                        ret += sprintf(&buf[ret], "[%s] ", led_src_texts[i]);
+                else
+                        ret += sprintf(&buf[ret], "%s ", led_src_texts[i]);
+
+        mutex_unlock(&led->mutex);
+
+        ret += sprintf(&buf[ret], "\n");
+
+        return ret;
+}
+
+static ssize_t wm831x_status_src_store(struct device *dev,
+                                       struct device_attribute *attr,
+                                       const char *buf, size_t size)
+{
+        struct led_classdev *led_cdev = dev_get_drvdata(dev);
+        struct wm831x_status *led = to_wm831x_status(led_cdev);
+        char name[20];
+        int i;
+        size_t len;
+
+        name[sizeof(name) - 1] = '\0';
+        strncpy(name, buf, sizeof(name) - 1);
+        len = strlen(name);
+
+        if (len && name[len - 1] == '\n')
+                name[len - 1] = '\0';
+
+        for (i = 0; i < ARRAY_SIZE(led_src_texts); i++) {
+                if (!strcmp(name, led_src_texts[i])) {
+                        mutex_lock(&led->mutex);
+
+                        led->src = i;
+                        schedule_work(&led->work);
+
+                        mutex_unlock(&led->mutex);
+                }
+        }
+
+        return size;
+}
+
+static DEVICE_ATTR(src, 0644, wm831x_status_src_show, wm831x_status_src_store);
+
+static int wm831x_status_probe(struct platform_device *pdev)
+{
+        struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
+        struct wm831x_pdata *chip_pdata;
+        struct wm831x_status_pdata pdata;
+        struct wm831x_status *drvdata;
+        struct resource *res;
+        int id = pdev->id % ARRAY_SIZE(chip_pdata->status);
+        int ret;
+
+        res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+        if (res == NULL) {
+                dev_err(&pdev->dev, "No I/O resource\n");
+                ret = -EINVAL;
+                goto err;
+        }
+
+        drvdata = kzalloc(sizeof(struct wm831x_status), GFP_KERNEL);
+        if (!drvdata)
+                return -ENOMEM;
+        dev_set_drvdata(&pdev->dev, drvdata);
+
+        drvdata->wm831x = wm831x;
+        drvdata->reg = res->start;
+
+        if (wm831x->dev->platform_data)
+                chip_pdata = wm831x->dev->platform_data;
+        else
+                chip_pdata = NULL;
+
+        memset(&pdata, 0, sizeof(pdata));
+        if (chip_pdata && chip_pdata->status[id])
+                memcpy(&pdata, chip_pdata->status[id], sizeof(pdata));
+        else
+                pdata.name = dev_name(&pdev->dev);
+
+        mutex_init(&drvdata->mutex);
+        INIT_WORK(&drvdata->work, wm831x_status_work);
+        spin_lock_init(&drvdata->value_lock);
+
+        /* We cache the configuration register and read startup values
+         * from it. */
+        drvdata->reg_val = wm831x_reg_read(wm831x, drvdata->reg);
+
+        if (drvdata->reg_val & WM831X_LED_MODE_MASK)
+                drvdata->brightness = LED_FULL;
+        else
+                drvdata->brightness = LED_OFF;
+
+        /* Set a default source if configured, otherwise leave the
+         * current hardware setting.
+         */
+        if (pdata.default_src == WM831X_STATUS_PRESERVE) {
+                drvdata->src = drvdata->reg_val;
+                drvdata->src &= WM831X_LED_SRC_MASK;
+                drvdata->src >>= WM831X_LED_SRC_SHIFT;
+        } else {
+                drvdata->src = pdata.default_src - 1;
+        }
+
+        drvdata->cdev.name = pdata.name;
+        drvdata->cdev.default_trigger = pdata.default_trigger;
+        drvdata->cdev.brightness_set = wm831x_status_set;
+        drvdata->cdev.blink_set = wm831x_status_blink_set;
+
+        ret = led_classdev_register(wm831x->dev, &drvdata->cdev);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
+                goto err_led;
+        }
+
+        ret = device_create_file(drvdata->cdev.dev, &dev_attr_src);
+        if (ret != 0)
+                dev_err(&pdev->dev,
+                        "No source control for LED: %d\n", ret);
+
+        return 0;
+
+err_led:
+        led_classdev_unregister(&drvdata->cdev);
+        kfree(drvdata);
+err:
+        return ret;
+}
+
+static int wm831x_status_remove(struct platform_device *pdev)
+{
+        struct wm831x_status *drvdata = platform_get_drvdata(pdev);
+
+        device_remove_file(drvdata->cdev.dev, &dev_attr_src);
+        led_classdev_unregister(&drvdata->cdev);
+        kfree(drvdata);
+
+        return 0;
+}
+
+static struct platform_driver wm831x_status_driver = {
+        .driver = {
+                   .name = "wm831x-status",
+                   .owner = THIS_MODULE,
+                   },
+        .probe = wm831x_status_probe,
+        .remove = wm831x_status_remove,
+};
+
+static int __devinit wm831x_status_init(void)
+{
+        return platform_driver_register(&wm831x_status_driver);
+}
+module_init(wm831x_status_init);
+
+static void wm831x_status_exit(void)
+{
+        platform_driver_unregister(&wm831x_status_driver);
+}
+module_exit(wm831x_status_exit);
+
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_DESCRIPTION("WM831x status LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:wm831x-status");