176 lines
3.9 KiB
C
176 lines
3.9 KiB
C
/*
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* TI LP8788 MFD - keyled driver
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*
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* Copyright 2012 Texas Instruments
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*
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* Author: Milo(Woogyom) Kim <milo.kim@ti.com>
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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 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/leds.h>
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#include <linux/mutex.h>
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#include <linux/mfd/lp8788.h>
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#include <linux/mfd/lp8788-isink.h>
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#define MAX_BRIGHTNESS LP8788_ISINK_MAX_PWM
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#define DEFAULT_LED_NAME "keyboard-backlight"
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struct lp8788_led {
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struct lp8788 *lp;
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struct mutex lock;
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struct led_classdev led_dev;
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enum lp8788_isink_number isink_num;
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int on;
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};
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struct lp8788_led_config {
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enum lp8788_isink_scale scale;
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enum lp8788_isink_number num;
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int iout;
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};
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static struct lp8788_led_config default_led_config = {
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.scale = LP8788_ISINK_SCALE_100mA,
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.num = LP8788_ISINK_3,
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.iout = 0,
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};
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static int lp8788_led_init_device(struct lp8788_led *led,
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struct lp8788_led_platform_data *pdata)
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{
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struct lp8788_led_config *cfg = &default_led_config;
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u8 addr, mask, val;
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int ret;
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if (pdata) {
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cfg->scale = pdata->scale;
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cfg->num = pdata->num;
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cfg->iout = pdata->iout_code;
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}
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led->isink_num = cfg->num;
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/* scale configuration */
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addr = LP8788_ISINK_CTRL;
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mask = 1 << (cfg->num + LP8788_ISINK_SCALE_OFFSET);
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val = cfg->scale << (cfg->num + LP8788_ISINK_SCALE_OFFSET);
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ret = lp8788_update_bits(led->lp, addr, mask, val);
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if (ret)
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return ret;
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/* current configuration */
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addr = lp8788_iout_addr[cfg->num];
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mask = lp8788_iout_mask[cfg->num];
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val = cfg->iout;
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return lp8788_update_bits(led->lp, addr, mask, val);
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}
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static int lp8788_led_enable(struct lp8788_led *led,
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enum lp8788_isink_number num, int on)
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{
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int ret;
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u8 mask = 1 << num;
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u8 val = on << num;
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ret = lp8788_update_bits(led->lp, LP8788_ISINK_CTRL, mask, val);
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if (ret == 0)
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led->on = on;
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return ret;
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}
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static int lp8788_brightness_set(struct led_classdev *led_cdev,
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enum led_brightness val)
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{
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struct lp8788_led *led =
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container_of(led_cdev, struct lp8788_led, led_dev);
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enum lp8788_isink_number num = led->isink_num;
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int enable, ret;
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mutex_lock(&led->lock);
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switch (num) {
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case LP8788_ISINK_1:
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case LP8788_ISINK_2:
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case LP8788_ISINK_3:
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ret = lp8788_write_byte(led->lp, lp8788_pwm_addr[num], val);
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if (ret < 0)
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goto unlock;
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break;
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default:
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mutex_unlock(&led->lock);
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return -EINVAL;
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}
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enable = (val > 0) ? 1 : 0;
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if (enable != led->on)
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ret = lp8788_led_enable(led, num, enable);
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unlock:
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mutex_unlock(&led->lock);
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return ret;
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}
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static int lp8788_led_probe(struct platform_device *pdev)
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{
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struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
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struct lp8788_led_platform_data *led_pdata;
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struct lp8788_led *led;
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struct device *dev = &pdev->dev;
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int ret;
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led = devm_kzalloc(dev, sizeof(struct lp8788_led), GFP_KERNEL);
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if (!led)
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return -ENOMEM;
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led->lp = lp;
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led->led_dev.max_brightness = MAX_BRIGHTNESS;
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led->led_dev.brightness_set_blocking = lp8788_brightness_set;
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led_pdata = lp->pdata ? lp->pdata->led_pdata : NULL;
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if (!led_pdata || !led_pdata->name)
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led->led_dev.name = DEFAULT_LED_NAME;
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else
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led->led_dev.name = led_pdata->name;
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mutex_init(&led->lock);
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ret = lp8788_led_init_device(led, led_pdata);
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if (ret) {
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dev_err(dev, "led init device err: %d\n", ret);
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return ret;
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}
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ret = devm_led_classdev_register(dev, &led->led_dev);
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if (ret) {
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dev_err(dev, "led register err: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static struct platform_driver lp8788_led_driver = {
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.probe = lp8788_led_probe,
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.driver = {
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.name = LP8788_DEV_KEYLED,
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},
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};
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module_platform_driver(lp8788_led_driver);
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MODULE_DESCRIPTION("Texas Instruments LP8788 Keyboard LED Driver");
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MODULE_AUTHOR("Milo Kim");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:lp8788-keyled");
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