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Release 4.14 drivers/leds/leds-asic3.c

Directory: drivers/leds
/*
 *  Copyright (C) 2011 Paul Parsons <lost.distance@yahoo.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/slab.h>

#include <linux/mfd/asic3.h>
#include <linux/mfd/core.h>
#include <linux/module.h>

/*
 *      The HTC ASIC3 LED GPIOs are inputs, not outputs.
 *      Hence we turn the LEDs on/off via the TimeBase register.
 */

/*
 *      When TimeBase is 4 the clock resolution is about 32Hz.
 *      This driver supports hardware blinking with an on+off
 *      period from 62ms (2 clocks) to 125s (4000 clocks).
 */

#define MS_TO_CLK(ms)	DIV_ROUND_CLOSEST(((ms)*1024), 32000)

#define CLK_TO_MS(clk)	(((clk)*32000)/1024)

#define MAX_CLK		4000            
/* Fits into 12-bit Time registers */

#define MAX_MS		CLK_TO_MS(MAX_CLK)


static const unsigned int led_n_base[ASIC3_NUM_LEDS] = {
	[0] = ASIC3_LED_0_Base,
	[1] = ASIC3_LED_1_Base,
	[2] = ASIC3_LED_2_Base,
};


static void brightness_set(struct led_classdev *cdev, enum led_brightness value) { struct platform_device *pdev = to_platform_device(cdev->dev->parent); const struct mfd_cell *cell = mfd_get_cell(pdev); struct asic3 *asic = dev_get_drvdata(pdev->dev.parent); u32 timebase; unsigned int base; timebase = (value == LED_OFF) ? 0 : (LED_EN|0x4); base = led_n_base[cell->id]; asic3_write_register(asic, (base + ASIC3_LED_PeriodTime), 32); asic3_write_register(asic, (base + ASIC3_LED_DutyTime), 32); asic3_write_register(asic, (base + ASIC3_LED_AutoStopCount), 0); asic3_write_register(asic, (base + ASIC3_LED_TimeBase), timebase); }

Contributors

PersonTokensPropCommitsCommitProp
Paul Parsons138100.00%1100.00%
Total138100.00%1100.00%


static int blink_set(struct led_classdev *cdev, unsigned long *delay_on, unsigned long *delay_off) { struct platform_device *pdev = to_platform_device(cdev->dev->parent); const struct mfd_cell *cell = mfd_get_cell(pdev); struct asic3 *asic = dev_get_drvdata(pdev->dev.parent); u32 on; u32 off; unsigned int base; if (*delay_on > MAX_MS || *delay_off > MAX_MS) return -EINVAL; if (*delay_on == 0 && *delay_off == 0) { /* If both are zero then a sensible default should be chosen */ on = MS_TO_CLK(500); off = MS_TO_CLK(500); } else { on = MS_TO_CLK(*delay_on); off = MS_TO_CLK(*delay_off); if ((on + off) > MAX_CLK) return -EINVAL; } base = led_n_base[cell->id]; asic3_write_register(asic, (base + ASIC3_LED_PeriodTime), (on + off)); asic3_write_register(asic, (base + ASIC3_LED_DutyTime), on); asic3_write_register(asic, (base + ASIC3_LED_AutoStopCount), 0); asic3_write_register(asic, (base + ASIC3_LED_TimeBase), (LED_EN|0x4)); *delay_on = CLK_TO_MS(on); *delay_off = CLK_TO_MS(off); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Paul Parsons236100.00%1100.00%
Total236100.00%1100.00%


static int asic3_led_probe(struct platform_device *pdev) { struct asic3_led *led = dev_get_platdata(&pdev->dev); int ret; ret = mfd_cell_enable(pdev); if (ret < 0) return ret; led->cdev = devm_kzalloc(&pdev->dev, sizeof(struct led_classdev), GFP_KERNEL); if (!led->cdev) { ret = -ENOMEM; goto out; } led->cdev->name = led->name; led->cdev->flags = LED_CORE_SUSPENDRESUME; led->cdev->brightness_set = brightness_set; led->cdev->blink_set = blink_set; led->cdev->default_trigger = led->default_trigger; ret = led_classdev_register(&pdev->dev, led->cdev); if (ret < 0) goto out; return 0; out: (void) mfd_cell_disable(pdev); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Paul Parsons14790.18%250.00%
Bryan Wu127.36%125.00%
Jingoo Han42.45%125.00%
Total163100.00%4100.00%


static int asic3_led_remove(struct platform_device *pdev) { struct asic3_led *led = dev_get_platdata(&pdev->dev); led_classdev_unregister(led->cdev); return mfd_cell_disable(pdev); }

Contributors

PersonTokensPropCommitsCommitProp
Paul Parsons3389.19%150.00%
Jingoo Han410.81%150.00%
Total37100.00%2100.00%

#ifdef CONFIG_PM_SLEEP
static int asic3_led_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); const struct mfd_cell *cell = mfd_get_cell(pdev); int ret; ret = 0; if (cell->suspend) ret = (*cell->suspend)(pdev); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Paul Parsons60100.00%1100.00%
Total60100.00%1100.00%


static int asic3_led_resume(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); const struct mfd_cell *cell = mfd_get_cell(pdev); int ret; ret = 0; if (cell->resume) ret = (*cell->resume)(pdev); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Paul Parsons60100.00%1100.00%
Total60100.00%1100.00%

#endif static SIMPLE_DEV_PM_OPS(asic3_led_pm_ops, asic3_led_suspend, asic3_led_resume); static struct platform_driver asic3_led_driver = { .probe = asic3_led_probe, .remove = asic3_led_remove, .driver = { .name = "leds-asic3", .pm = &asic3_led_pm_ops, }, }; module_platform_driver(asic3_led_driver); MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>"); MODULE_DESCRIPTION("HTC ASIC3 LED driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:leds-asic3");

Overall Contributors

PersonTokensPropCommitsCommitProp
Paul Parsons80395.26%228.57%
Jingoo Han192.25%228.57%
Bryan Wu121.42%114.29%
Axel Lin60.71%114.29%
Paul Gortmaker30.36%114.29%
Total843100.00%7100.00%
Directory: drivers/leds
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