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    SubjectRe: [PATCH 06/13] mfd: pxa-w1: MFD driver for PXA 1wire control + DS1WM chip
    From
    On 4/13/11, Haojian Zhuang <haojian.zhuang@marvell.com> wrote:
    > This driver provides registers and IRQ of PXA3xx chips to the ds1wm driver.
    >
    > Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
    > Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
    > ---
    > 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@marvell.com>
    > + *
    > + * 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@marvell.com>");
    > +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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