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