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>

drivers/leds/Kconfig

@@ -169,6 +169,18 @@ config LEDS_MSM_PDM
 	  To compile this driver as a module, choose M here: the
 	  module will be called leds-msm-pdm.
 
+config LEDS_PMIC_MPP
+        tristate "LED Support for Qualcomm PMIC MPP connected LEDs"
+        depends on LEDS_CLASS && MSM_SMD
+        help
+          This option enables support for LEDs connected to  PMIC MPPs
+	  on Qualcomm reference boards.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called leds-pmic-mpp.
+
 config LEDS_LP3944
 	tristate "LED Support for N.S. LP3944 (Fun Light) I2C chip"
 	depends on LEDS_CLASS

drivers/leds/Makefile

@@ -48,6 +48,7 @@ obj-$(CONFIG_LEDS_NETXBIG)		+= leds-netxbig.o
 obj-$(CONFIG_LEDS_ASIC3)		+= leds-asic3.o
 obj-$(CONFIG_LEDS_RENESAS_TPU)		+= leds-renesas-tpu.o
 obj-$(CONFIG_LEDS_MAX8997)		+= leds-max8997.o
+obj-$(CONFIG_LEDS_PMIC_MPP)		+= leds-pmic-mpp.o
 obj-$(CONFIG_LEDS_MSM_PDM)		+= leds-msm-pdm.o
 
 # LED SPI Drivers

drivers/leds/leds-pmic-mpp.c

@@ -0,0 +1,141 @@
+/* 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 <linux/module.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");