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SubjectRe: [PATCH 06/13] mfd: pxa-w1: MFD driver for PXA 1wire control + DS1WM chip
于 2011-4-14 22:21, Haojian Zhuang 写道:
>
>
>> -----Original Message-----
>> From: gaowanlong@gmail.com [mailto:gaowanlong@gmail.com] On Behalf Of
>> Wanlong Gao
>> Sent: 2011年4月14日 10:18 PM
>> To: Haojian Zhuang
>> Cc: sameo@linux.intel.com; haojian.zhuang@gmail.com; linux-
>> kernel@vger.kernel.org; Evgeniy Polyakov
>> Subject: Re: [PATCH 06/13] mfd: pxa-w1: MFD driver for PXA 1wire control
>> + DS1WM chip
>>
>> 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) ?
>
> Why do you always stick to use !r? I like to use NULL since it's clear to me.
>
Use your habits and I just make a noise .
Thanks


>>> + 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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