linux-kernel - Re: Support for synaptic touchscreen in HTC dream

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Message-ID: <20090715133627.GA2538@elf.ucw.cz>
Date:	Wed, 15 Jul 2009 15:36:27 +0200
From:	Pavel Machek <pavel@....cz>
To:	Trilok Soni <soni.trilok@...il.com>
Cc:	Arve Hj?nnev?g <arve@...roid.com>,
	kernel list <linux-kernel@...r.kernel.org>,
	Brian Swetland <swetland@...gle.com>,
	dmitry.torokhov@...il.com, dtor@...l.ru,
	linux-input@...r.kernel.org, Andrew Morton <akpm@...l.org>,
	linux-i2c@...r.kernel.org
Subject: Re: Support for synaptic touchscreen in HTC dream

Hi!

> > +static void decode_report(struct synaptics_ts_data *ts, u8 *buf)
> > +{
> 
> some documentation about this logic would be great.

Arve, can you help here?


> > +       int pos[2][2];
> > +       int f, a;
> > +       int base = 2;
> > +       int z = buf[1];
> > +       int w = buf[0] >> 4;
> > +       int finger = buf[0] & 7;
> > +       int finger2_pressed;
> > +
> > +       for (f = 0; f < 2; f++) {
> > +               u32 flip_flag = SYNAPTICS_FLIP_X;
> > +               for (a = 0; a < 2; a++) {
> > +                       int p = buf[base + 1];
> > +                       p |= (u16)(buf[base] & 0x1f) << 8;
> > +                       if (ts->flags & flip_flag)
> > +                               p = ts->max[a] - p;
> > +                       if (ts->flags & SYNAPTICS_SNAP_TO_INACTIVE_EDGE) {


> > +static irqreturn_t synaptics_ts_irq_handler(int irq, void *dev_id)
> > +{
> > +       struct synaptics_ts_data *ts = dev_id;
> > +
> > +       disable_irq(ts->client->irq);
> 
> disable_irq_nosync or convert this to request_threaded_irq(...).
> Please see recent discussion on linux-input for MAX key switch
> controller.

Do you have a link? (I replaced it with disable_irq_nosync, if that is
enough...)

> > +static int synaptics_ts_probe(
> > +       struct i2c_client *client, const struct i2c_device_id *id)
> > +{
> 
> __devinit ?

Ok.

> > +       if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
> 
> check for SMBUS? I have added linux-i2c as this driver has i2c bits,
> so not removing any code.

I guess this driver is only probed on mach-pxa... on machines that
have the neccessary hardware.

> > +               printk(KERN_ERR "synaptics_ts_probe: need I2C_FUNC_I2C\n");
> 
> dev_xxx/pr_xxx friends?

Fixed all occurences.


> > +       ts->input_dev = input_allocate_device();
> > +       if (ts->input_dev == NULL) {
> > +               ret = -ENOMEM;
> > +               pr_err("synaptics: Failed to allocate input device\n");
> > +               goto err_input_dev_alloc_failed;
> > +       }
> > +       ts->input_dev->name = "synaptics-rmi-touchscreen";
> 
> other parameters of input_dev, like vendor, bus etc.,

Ok, what are those for? I can probably invent some dummy values, but...

> > +       set_bit(EV_SYN, ts->input_dev->evbit);
> > +       set_bit(EV_KEY, ts->input_dev->evbit);
> > +       set_bit(BTN_TOUCH, ts->input_dev->keybit);
> > +       set_bit(BTN_2, ts->input_dev->keybit);
> > +       set_bit(EV_ABS, ts->input_dev->evbit);
> > +
> 
> __set_bit or input_set_capability please.

__set_bit is easier, done.

> > +static int synaptics_ts_remove(struct i2c_client *client)
> > +{
> 
> __devexit

Applied.


> > +static int synaptics_ts_suspend(struct i2c_client *client, pm_message_t mesg)
> > +{
> 
> #ifdef CONFIG_PM ?

Yep.

> > +MODULE_DESCRIPTION("Synaptics Touchscreen Driver");
> > +MODULE_LICENSE("GPL");
> 
> MODULE_ALIAS?

Umm, why? This is loaded from board-*.c files, and I don't think i2c
has enumeration capabilities.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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