leds: leds-pmic-mpp: Add support for MPP connected LED
Add support for LEDs which are connected to PMIC MPPs.
Change-Id: Ib53510dbcb745e92e2100c1afc6dc2d94938fc85
CRs-fixed: 354967
Signed-off-by: Mohan Pallaka <mpallaka@codeaurora.org>
diff --git a/drivers/leds/leds-pmic-mpp.c b/drivers/leds/leds-pmic-mpp.c
new file mode 100644
index 0000000..0de41de
--- /dev/null
+++ b/drivers/leds/leds-pmic-mpp.c
@@ -0,0 +1,140 @@
+/* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/slab.h>
+
+#include <mach/pmic.h>
+
+#define LED_MPP(x) ((x) & 0xFF)
+#define LED_CURR(x) ((x) >> 16)
+
+struct pmic_mpp_led_data {
+ struct led_classdev cdev;
+ int curr;
+ int mpp;
+};
+
+static void pm_mpp_led_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct pmic_mpp_led_data *led;
+ int ret;
+
+ led = container_of(led_cdev, struct pmic_mpp_led_data, cdev);
+
+ if (value < LED_OFF || value > led->cdev.max_brightness) {
+ dev_err(led->cdev.dev, "Invalid brightness value");
+ return;
+ }
+
+ ret = pmic_secure_mpp_config_i_sink(led->mpp, led->curr,
+ value ? PM_MPP__I_SINK__SWITCH_ENA :
+ PM_MPP__I_SINK__SWITCH_DIS);
+ if (ret)
+ dev_err(led_cdev->dev, "can't set mpp led\n");
+}
+
+static int pmic_mpp_led_probe(struct platform_device *pdev)
+{
+ const struct led_platform_data *pdata = pdev->dev.platform_data;
+ struct pmic_mpp_led_data *led, *tmp_led;
+ int i, rc;
+
+ if (!pdata) {
+ dev_err(&pdev->dev, "platform data not supplied\n");
+ return -EINVAL;
+ }
+
+ led = kcalloc(pdata->num_leds, sizeof(*led), GFP_KERNEL);
+ if (!led) {
+ dev_err(&pdev->dev, "failed to alloc memory\n");
+ return -ENOMEM;
+ }
+
+ platform_set_drvdata(pdev, led);
+
+ for (i = 0; i < pdata->num_leds; i++) {
+ tmp_led = &led[i];
+ tmp_led->cdev.name = pdata->leds[i].name;
+ tmp_led->cdev.brightness_set = pm_mpp_led_set;
+ tmp_led->cdev.brightness = LED_OFF;
+ tmp_led->cdev.max_brightness = LED_FULL;
+ tmp_led->mpp = LED_MPP(pdata->leds[i].flags);
+ tmp_led->curr = LED_CURR(pdata->leds[i].flags);
+
+ if (tmp_led->curr < PM_MPP__I_SINK__LEVEL_5mA ||
+ tmp_led->curr > PM_MPP__I_SINK__LEVEL_40mA) {
+ dev_err(&pdev->dev, "invalid current\n");
+ goto unreg_led_cdev;
+ }
+
+ rc = led_classdev_register(&pdev->dev, &tmp_led->cdev);
+ if (rc) {
+ dev_err(&pdev->dev, "failed to register led\n");
+ goto unreg_led_cdev;
+ }
+ }
+
+ return 0;
+
+unreg_led_cdev:
+ while (i)
+ led_classdev_unregister(&led[--i].cdev);
+
+ kfree(led);
+ return rc;
+
+}
+
+static int __devexit pmic_mpp_led_remove(struct platform_device *pdev)
+{
+ const struct led_platform_data *pdata = pdev->dev.platform_data;
+ struct pmic_mpp_led_data *led = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < pdata->num_leds; i++)
+ led_classdev_unregister(&led[i].cdev);
+
+ kfree(led);
+
+ return 0;
+}
+
+static struct platform_driver pmic_mpp_led_driver = {
+ .probe = pmic_mpp_led_probe,
+ .remove = __devexit_p(pmic_mpp_led_remove),
+ .driver = {
+ .name = "pmic-mpp-leds",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init pmic_mpp_led_init(void)
+{
+ return platform_driver_register(&pmic_mpp_led_driver);
+}
+module_init(pmic_mpp_led_init);
+
+static void __exit pmic_mpp_led_exit(void)
+{
+ platform_driver_unregister(&pmic_mpp_led_driver);
+}
+module_exit(pmic_mpp_led_exit);
+
+MODULE_DESCRIPTION("PMIC MPP LEDs driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:pmic-mpp-leds");