leds: Add ASIC3 LED support
Add LED support for the HTC ASIC3. Underlying support is provided by the mfd/asic3 and leds/leds-asic3 drivers. An example configuration is provided by the pxa/hx4700 platform. Signed-off-by: Paul Parsons <lost.distance@yahoo.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Paul Parsons
committed by
Samuel Ortiz
Samuel Ortiz
parent
4a7c00cd94
commit
7d9e7e9fbd
165
drivers/leds/leds-asic3.c
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165
drivers/leds/leds-asic3.c
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/*
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* Copyright (C) 2011 Paul Parsons <lost.distance@yahoo.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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#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/mfd/asic3.h>
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#include <linux/mfd/core.h>
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/*
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* The HTC ASIC3 LED GPIOs are inputs, not outputs.
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* Hence we turn the LEDs on/off via the TimeBase register.
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*/
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/*
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* When TimeBase is 4 the clock resolution is about 32Hz.
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* This driver supports hardware blinking with an on+off
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* period from 62ms (2 clocks) to 125s (4000 clocks).
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*/
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#define MS_TO_CLK(ms) DIV_ROUND_CLOSEST(((ms)*1024), 32000)
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#define CLK_TO_MS(clk) (((clk)*32000)/1024)
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#define MAX_CLK 4000 /* Fits into 12-bit Time registers */
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#define MAX_MS CLK_TO_MS(MAX_CLK)
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static const unsigned int led_n_base[ASIC3_NUM_LEDS] = {
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[0] = ASIC3_LED_0_Base,
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[1] = ASIC3_LED_1_Base,
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[2] = ASIC3_LED_2_Base,
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};
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static void brightness_set(struct led_classdev *cdev,
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enum led_brightness value)
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{
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struct platform_device *pdev = to_platform_device(cdev->dev->parent);
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const struct mfd_cell *cell = mfd_get_cell(pdev);
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struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
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u32 timebase;
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unsigned int base;
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timebase = (value == LED_OFF) ? 0 : (LED_EN|0x4);
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base = led_n_base[cell->id];
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asic3_write_register(asic, (base + ASIC3_LED_PeriodTime), 32);
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asic3_write_register(asic, (base + ASIC3_LED_DutyTime), 32);
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asic3_write_register(asic, (base + ASIC3_LED_AutoStopCount), 0);
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asic3_write_register(asic, (base + ASIC3_LED_TimeBase), timebase);
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}
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static int blink_set(struct led_classdev *cdev,
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unsigned long *delay_on,
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unsigned long *delay_off)
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{
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struct platform_device *pdev = to_platform_device(cdev->dev->parent);
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const struct mfd_cell *cell = mfd_get_cell(pdev);
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struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
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u32 on;
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u32 off;
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unsigned int base;
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if (*delay_on > MAX_MS || *delay_off > MAX_MS)
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return -EINVAL;
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if (*delay_on == 0 && *delay_off == 0) {
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/* If both are zero then a sensible default should be chosen */
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on = MS_TO_CLK(500);
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off = MS_TO_CLK(500);
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} else {
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on = MS_TO_CLK(*delay_on);
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off = MS_TO_CLK(*delay_off);
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if ((on + off) > MAX_CLK)
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return -EINVAL;
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}
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base = led_n_base[cell->id];
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asic3_write_register(asic, (base + ASIC3_LED_PeriodTime), (on + off));
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asic3_write_register(asic, (base + ASIC3_LED_DutyTime), on);
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asic3_write_register(asic, (base + ASIC3_LED_AutoStopCount), 0);
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asic3_write_register(asic, (base + ASIC3_LED_TimeBase), (LED_EN|0x4));
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*delay_on = CLK_TO_MS(on);
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*delay_off = CLK_TO_MS(off);
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return 0;
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}
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static int __devinit asic3_led_probe(struct platform_device *pdev)
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{
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struct asic3_led *led = pdev->dev.platform_data;
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int ret;
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ret = mfd_cell_enable(pdev);
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if (ret < 0)
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goto ret0;
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led->cdev = kzalloc(sizeof(struct led_classdev), GFP_KERNEL);
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if (!led->cdev) {
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ret = -ENOMEM;
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goto ret1;
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}
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led->cdev->name = led->name;
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led->cdev->default_trigger = led->default_trigger;
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led->cdev->brightness_set = brightness_set;
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led->cdev->blink_set = blink_set;
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ret = led_classdev_register(&pdev->dev, led->cdev);
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if (ret < 0)
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goto ret2;
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return 0;
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ret2:
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kfree(led->cdev);
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ret1:
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(void) mfd_cell_disable(pdev);
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ret0:
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return ret;
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}
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static int __devexit asic3_led_remove(struct platform_device *pdev)
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{
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struct asic3_led *led = pdev->dev.platform_data;
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led_classdev_unregister(led->cdev);
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kfree(led->cdev);
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return mfd_cell_disable(pdev);
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}
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static struct platform_driver asic3_led_driver = {
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.probe = asic3_led_probe,
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.remove = __devexit_p(asic3_led_remove),
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.driver = {
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.name = "leds-asic3",
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.owner = THIS_MODULE,
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},
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};
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MODULE_ALIAS("platform:leds-asic3");
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static int __init asic3_led_init(void)
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{
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return platform_driver_register(&asic3_led_driver);
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}
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static void __exit asic3_led_exit(void)
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{
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platform_driver_unregister(&asic3_led_driver);
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}
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module_init(asic3_led_init);
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module_exit(asic3_led_exit);
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MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>");
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MODULE_DESCRIPTION("HTC ASIC3 LED driver");
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MODULE_LICENSE("GPL");
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