Re: [PATCH 06/13] mfd: pxa-w1: MFD driver for PXA 1wire control +DS1WM chip

[Wanlong Gao]

On 4/13/11, Haojian Zhuang <haojian.zhuang@xxxxxxxxxxx> wrote:
> This driver provides registers and IRQ of PXA3xx chips to the ds1wm driver.
>
> Signed-off-by: Haojian Zhuang <haojian.zhuang@xxxxxxxxxxx>
> Cc: Evgeniy Polyakov <johnpol@xxxxxxxxxxx>
> ---
>  drivers/mfd/Kconfig  |    7 ++
>  drivers/mfd/Makefile |    1 +
>  drivers/mfd/pxa-w1.c |  150
> ++++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 158 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/mfd/pxa-w1.c
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index e2fea58..b6ecf90 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -34,6 +34,13 @@ config MFD_88PM860X
>  	  select individual components like voltage regulators, RTC and
>  	  battery-charger under the corresponding menus.
>
> +config MFD_PXA_DS1WM
> +	tristate "Support DS1WM chip on Marvell silicons"
> +	select MFD_CORE
> +	help
> +	  This core driver provides register access for PXA_DS1WM.
> +	  Actual functionality is handled by the ds1wm drivers.
> +
>  config MFD_SM501
>  	tristate "Support for Silicon Motion SM501"
>  	 ---help---
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 419caa9..4f8d1d2 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -4,6 +4,7 @@
>
>  88pm860x-objs			:= 88pm860x-core.o 88pm860x-i2c.o
>  obj-$(CONFIG_MFD_88PM860X)	+= 88pm860x.o
> +obj-$(CONFIG_MFD_PXA_DS1WM)	+= pxa-w1.o
>  obj-$(CONFIG_MFD_SM501)		+= sm501.o
>  obj-$(CONFIG_MFD_ASIC3)		+= asic3.o tmio_core.o
>
> diff --git a/drivers/mfd/pxa-w1.c b/drivers/mfd/pxa-w1.c
> new file mode 100644
> index 0000000..98074ff
> --- /dev/null
> +++ b/drivers/mfd/pxa-w1.c
> @@ -0,0 +1,150 @@
> +/*
> + * Core driver for PXA DS1WM chip.
> + *
> + * Copyright (C) 2010 Marvell  <jtzhou@xxxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; version 2 of the License.
> + */
> +
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/platform_device.h>
> +#include <linux/gpio.h>
> +#include <linux/io.h>
> +#include <linux/irq.h>
> +#include <linux/clk.h>
> +#include <linux/err.h>
> +#include <linux/interrupt.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/ds1wm.h>
> +
> +struct pxa_w1_info {
> +	struct clk *clk;
> +};
> +
> +static int ds1wm_enable(struct platform_device *pdev)
> +{
> +	struct device *dev = pdev->dev.parent;
> +	struct pxa_w1_info *info = dev_get_drvdata(dev);
> +
> +	clk_enable(info->clk);
> +	dev_dbg(dev, "pxa DS1WM clk (active)\n");
> +	return 0;
> +}
> +
> +static int ds1wm_disable(struct platform_device *pdev)
> +{
> +	struct device *dev = pdev->dev.parent;
> +	struct pxa_w1_info *info = dev_get_drvdata(dev);
> +
> +	clk_disable(info->clk);
> +	dev_dbg(dev, "pxa DS1WM clk (in-active)\n");
> +	return 0;
> +}
> +
> +static struct resource ds1wm_resources[] __devinitdata = {
> +	{0, 0, "ds1wm-mem", IORESOURCE_MEM,},
> +	{0, 0, "ds1wm-irq", IORESOURCE_IRQ,},
> +};
> +
> +static struct ds1wm_driver_data ds1wm_pdata;
> +
> +static struct mfd_cell ds1wm_cell __devinitdata = {
> +	.name		= "ds1wm",
> +	.enable		= ds1wm_enable,
> +	.disable	= ds1wm_disable,
> +	.platform_data	= &ds1wm_pdata,
> +	.pdata_size	= sizeof(ds1wm_pdata),
> +	.num_resources	= ARRAY_SIZE(ds1wm_resources),
> +	.resources	= ds1wm_resources,
> +};
> +
> +static int __devinit pxa_w1_probe(struct platform_device *pdev)
> +{
> +	struct ds1wm_driver_data *pdata = pdev->dev.platform_data;
> +	struct pxa_w1_info *info;
> +	struct resource *r;
> +	int ret, irq;
> +
> +	info = kzalloc(sizeof(struct pxa_w1_info), GFP_KERNEL);
> +	if (!info)
> +		return -ENOMEM;
> +
> +	r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> +	if (r == NULL) {
Prefer to (!r) ?
> +		ret = -ENXIO;
> +		goto out;
> +	}
> +	irq = r->start;
> +	if (pdata)
> +		ds1wm_pdata.active_high = pdata->active_high;
> +	if (ds1wm_pdata.active_high)
> +		ds1wm_resources[1].flags |= IORESOURCE_IRQ_HIGHEDGE;
> +	else
> +		ds1wm_resources[1].flags |= IORESOURCE_IRQ_LOWEDGE;
> +
> +	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (r == NULL) {
The same ?
> +		ret = -ENXIO;
> +		goto out;
> +	}
> +	ds1wm_resources[0].end = resource_size(r) - 1;
> +
> +	info->clk = clk_get(&pdev->dev, NULL);
> +	if (IS_ERR(info->clk)) {
> +		ret = PTR_ERR(info->clk);
> +		goto out;
> +	}
> +	platform_set_drvdata(pdev, info);
> +
> +	ds1wm_pdata.clock_rate = clk_get_rate(info->clk);
> +	ret = mfd_add_devices(&pdev->dev, pdev->id, &ds1wm_cell, 1, r, irq);
> +	if (ret < 0)
> +		dev_err(&pdev->dev, "failed to register pxa DS1WM\n");
> +
> +	return 0;
> +out:
> +	kfree(info);
> +	return ret;
> +}
> +
> +static int __devexit pxa_w1_remove(struct platform_device *pdev)
> +{
> +	struct pxa_w1_info *info = platform_get_drvdata(pdev);
> +
> +	mfd_remove_devices(&pdev->dev);
> +	clk_put(info->clk);
> +	kfree(info);
> +	platform_set_drvdata(pdev, NULL);
> +	return 0;
> +}
> +
> +static struct platform_driver pxa_w1_driver = {
> +	.driver = {
> +		   .name	= "pxa3xx-w1",
> +		   .owner	= THIS_MODULE,
> +	},
> +	.probe		= pxa_w1_probe,
> +	.remove		= __devexit_p(pxa_w1_remove),
> +};
> +
> +static int __init pxa_w1_base_init(void)
> +{
> +	return platform_driver_register(&pxa_w1_driver);
> +}
> +
> +static void __exit pxa_w1_base_exit(void)
> +{
> +	platform_driver_unregister(&pxa_w1_driver);
> +}
> +
> +module_init(pxa_w1_base_init);
> +module_exit(pxa_w1_base_exit);
> +
> +MODULE_AUTHOR("Jett Zhou <jtzhou@xxxxxxxxxxx>");
> +MODULE_DESCRIPTION("one wire driver for PXA");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:pxa-w1");

Best regards ,
Thanks
> --
> 1.5.6.5
>
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