Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755832Ab1D3R7i (ORCPT ); Sat, 30 Apr 2011 13:59:38 -0400 Received: from relay.ptn-ipout01.plus.net ([212.159.7.35]:55147 "EHLO relay.ptn-ipout01.plus.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751527Ab1D3R7e (ORCPT ); Sat, 30 Apr 2011 13:59:34 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AnYZAB9NvE3Unw4U/2dsb2JhbACCNIJfkw2Nd3ezFQKGPokXDoVyBJMSg36GCw Subject: [PATCH 2/2] leds: Add ASIC3 LED support From: "Paul Parsons" To: Cc: Date: Sat, 30 Apr 2011 17:59:31 +0000 Content-Type: text/plain Mime-Version: 1.0 X-Mailer: email v2.5.0 (Linux 2.6.38 x86_64 [http://email.cleancode.org]) Message-Id: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6618 Lines: 212 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 --- diff -uprN clean-2.6.39-rc5/drivers/leds/Kconfig linux-2.6.39-rc5/drivers/leds/Kconfig --- clean-2.6.39-rc5/drivers/leds/Kconfig 2011-04-28 11:18:14.818578777 +0100 +++ linux-2.6.39-rc5/drivers/leds/Kconfig 2011-04-30 16:39:48.434871549 +0100 @@ -379,6 +379,16 @@ config LEDS_NETXBIG and 5Big Network v2 boards. The LEDs are wired to a CPLD and are controlled through a GPIO extension bus. +config LEDS_ASIC3 + bool "LED support for the HTC ASIC3" + depends on MFD_ASIC3 + default y + help + This option enables support for the LEDs on the HTC ASIC3. The HTC + ASIC3 LED GPIOs are inputs, not outputs, thus the leds-gpio driver + cannot be used. This driver supports hardware blinking with an on+off + period from 62ms to 125s. Say Y to enable LEDs on the HP iPAQ hx4700. + config LEDS_TRIGGERS bool "LED Trigger support" depends on LEDS_CLASS diff -uprN clean-2.6.39-rc5/drivers/leds/Makefile linux-2.6.39-rc5/drivers/leds/Makefile --- clean-2.6.39-rc5/drivers/leds/Makefile 2011-04-28 11:18:14.818578777 +0100 +++ linux-2.6.39-rc5/drivers/leds/Makefile 2011-04-30 15:44:30.288890098 +0100 @@ -42,6 +42,7 @@ obj-$(CONFIG_LEDS_DELL_NETBOOKS) += dell obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o obj-$(CONFIG_LEDS_NS2) += leds-ns2.o obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o +obj-$(CONFIG_LEDS_ASIC3) += leds-asic3.o # LED SPI Drivers obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o diff -uprN clean-2.6.39-rc5/drivers/leds/leds-asic3.c linux-2.6.39-rc5/drivers/leds/leds-asic3.c --- clean-2.6.39-rc5/drivers/leds/leds-asic3.c 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.6.39-rc5/drivers/leds/leds-asic3.c 2011-04-30 16:39:41.066821912 +0100 @@ -0,0 +1,167 @@ +/* + * Copyright (C) 2011 Paul Parsons + * + * 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 +#include +#include +#include +#include + +#include +#include + +/* + * 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) ((((ms)*1024)+16000)/32000) /* Round to nearest */ +#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); +} + +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; +} + +static int __devinit asic3_led_probe(struct platform_device *pdev) +{ + struct asic3_led *led = mfd_get_data(pdev); + int ret; + + ret = mfd_cell_enable(pdev); + if (ret < 0) + goto ret0; + + led->cdev = kzalloc(sizeof(struct led_classdev), GFP_KERNEL); + if (!led->cdev) { + ret = -ENOMEM; + goto ret1; + } + + led->cdev->name = led->name; + led->cdev->default_trigger = led->default_trigger; + led->cdev->brightness_set = brightness_set; + led->cdev->blink_set = blink_set; + + ret = led_classdev_register(&pdev->dev, led->cdev); + if (ret < 0) + goto ret2; + + return 0; + +ret2: + kfree(led->cdev); +ret1: + (void) mfd_cell_disable(pdev); +ret0: + return ret; +} + +static int __devexit asic3_led_remove(struct platform_device *pdev) +{ + struct asic3_led *led = mfd_get_data(pdev); + + led_classdev_unregister(led->cdev); + + kfree(led->cdev); + + (void) mfd_cell_disable(pdev); + + return 0; +} + +static struct platform_driver asic3_led_driver = { + .probe = asic3_led_probe, + .remove = __devexit_p(asic3_led_remove), + .driver = { + .name = "leds-asic3", + .owner = THIS_MODULE, + }, +}; + +MODULE_ALIAS("platform:leds-asic3"); + +static int __init asic3_led_init(void) +{ + return platform_driver_register(&asic3_led_driver); +} + +static void __exit asic3_led_exit(void) +{ + platform_driver_unregister(&asic3_led_driver); +} + +module_init(asic3_led_init); +module_exit(asic3_led_exit); + +MODULE_AUTHOR("Paul Parsons "); +MODULE_DESCRIPTION("HTC ASIC3 LED driver"); +MODULE_LICENSE("GPL"); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/