linux-kernel - Re: [PATCHv2 1/7] input/cma3000_d0x: Support devices without pdata

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Message-ID: <4E9D8317.8020506@cam.ac.uk>
Date:	Tue, 18 Oct 2011 14:45:59 +0100
From:	Jonathan Cameron <jic23@....ac.uk>
To:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
CC:	dmitry.torokhov@...il.com, sameo@...ux.intel.com,
	peter.ujfalusi@...com, aghayal@...eaurora.org, david@...deman.nu,
	Shubhrajyoti@...com, saaguirre@...com, hemanthv@...com,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 1/7] input/cma3000_d0x: Support devices without pdata

On 10/18/11 13:58, Ricardo Ribalda Delgado wrote:
> Hello Jonathan
> 
> I think I am going to do it like ads1015.c. I will check for the
> pdata, then for the dt info (if it is there) and finally go for the
> default, if all fails. What do you think? Shall I fix it in cma3000
> and cmr3000?
That sounds like the best plan to me.  Fix them both.
> 
>  Thanks again
> 
> On Tue, Oct 18, 2011 at 14:53, Jonathan Cameron <jic23@....ac.uk> wrote:
>> On 10/18/11 13:06, Ricardo Ribalda Delgado wrote:
>>> Architectures based on device-tree does not have platform data
>>> associated to the spi/i2c devices.
>>> This patch allows those architectures to use the cma3000 driver with
>>> a default configuration.
>> Fine except for this description. Looks to be a perfectly reasonable
>> way of specifying these in DT.  So fix that and I'm happy.
>> Whoever wants to pass this in from DT can do a patch for it!
>>>
>>> ---
>>>
>>> v2: Fixes suggested by Jonathan Cameron
>>>     -Spelling
>>>     -Simplify pdata!=NULL check
>>>
>>> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
>> Acked-by: Jonathan Cameron <jic23@....ac.uk>
>>> ---
>>>  drivers/input/misc/cma3000_d0x.c |   20 +++++++++++++++-----
>>>  1 files changed, 15 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/drivers/input/misc/cma3000_d0x.c b/drivers/input/misc/cma3000_d0x.c
>>> index 1633b63..f2e87e3 100644
>>> --- a/drivers/input/misc/cma3000_d0x.c
>>> +++ b/drivers/input/misc/cma3000_d0x.c
>>> @@ -62,6 +62,18 @@
>>>  #define BIT_TO_2G  18
>>>  #define BIT_TO_8G  71
>>>
>>> +static struct cma3000_platform_data cma3000_default_pdata = {
>>> +     .mdthr = 0x8,
>>> +     .mdfftmr = 0x33,
>>> +     .ffthr = 0x8,
>>> +     .mode = CMAMODE_MEAS400,
>>> +     .g_range = CMARANGE_2G,
>>> +     .fuzz_x = BIT_TO_2G,
>>> +     .fuzz_y = BIT_TO_2G,
>>> +     .fuzz_z = BIT_TO_2G,
>>> +     .irqflags = 0,
>>> +};
>>> +
>>>  struct cma3000_accl_data {
>>>       const struct cma3000_bus_ops *bus_ops;
>>>       const struct cma3000_platform_data *pdata;
>>> @@ -289,13 +301,11 @@ struct cma3000_accl_data *cma3000_init(struct device *dev, int irq,
>>>       int rev;
>>>       int error;
>>>
>>> -     if (!pdata) {
>>> -             dev_err(dev, "platform data not found\n");
>>> -             error = -EINVAL;
>>> -             goto err_out;
>>> +     if (pdata == NULL) {
>>> +             dev_info(dev, "platform data not found, using default\n");
>>> +             pdata = &cma3000_default_pdata;
>>>       }
>>>
>>> -
>>>       /* if no IRQ return error */
>>>       if (irq == 0) {
>>>               error = -EINVAL;
>>
>>
> 
> 
> 

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