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Date:	Tue, 13 Jul 2010 04:34:24 +0200
From:	Christoph Fritz <chf.fritz@...glemail.com>
To:	Kevin McNeely <kev@...ress.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	David Brown <davidb@...eaurora.org>,
	Trilok Soni <tsoni@...eaurora.org>,
	Fred <fwk@...ntu.linuxcertified.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Eric Miao <eric.y.miao@...il.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Simtec Linux Team <linux@...tec.co.uk>,
	Arnaud Patard <arnaud.patard@...-net.org>,
	Antonio Ospite <ospite@...denti.unina.it>,
	Henrik Rydberg <rydberg@...omail.se>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	chf.fritz@...glemail.com
Subject: Re: [PATCH] i2c: cyttsp i2c touchscreen driver init submit

On Mon, 2010-07-12 at 13:56 -0700, Kevin McNeely wrote:
> From: Fred <fwk@...ntu.linuxcertified.com>
> 
> This is a new touchscreen driver for the Cypress Semiconductor
> cyttsp family of devices.  This driver is for the i2c version
> of cyttsp parts.
> 
> Signed-off-by: Kevin McNeely <kev@...ress.com>
> ---
>  drivers/input/touchscreen/Kconfig      |   13 +
>  drivers/input/touchscreen/Makefile     |    1 +
>  drivers/input/touchscreen/cyttsp-i2c.c | 2016 ++++++++++++++++++++++++++++++++
>  include/linux/cyttsp.h                 |  649 ++++++++++
>  4 files changed, 2679 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/input/touchscreen/cyttsp-i2c.c
>  create mode 100644 include/linux/cyttsp.h
> 
> diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
> index 3b9d5e2..a7a69a0 100644
> --- a/drivers/input/touchscreen/Kconfig
> +++ b/drivers/input/touchscreen/Kconfig
> @@ -603,4 +603,17 @@ config TOUCHSCREEN_TPS6507X
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called tps6507x_ts.
>  
> +config TOUCHSCREEN_CYTTSP_I2C
> +	default n
> +	tristate "Cypress TTSP i2c touchscreen"
> +	depends on I2C
> +	help
> +	  Say Y here if you have a Cypress TTSP touchscreen
> +	  connected to your system's i2c bus.
> +
> +	  If unsure, say N.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called cyttsp_i2c.

below it's named cyttsp-i2c

> +
>  endif
> diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
> index 497964a..2026cb8 100644
> --- a/drivers/input/touchscreen/Makefile
> +++ b/drivers/input/touchscreen/Makefile
> @@ -47,3 +47,4 @@ obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE)	+= mainstone-wm97xx.o
>  obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE)	+= zylonite-wm97xx.o
>  obj-$(CONFIG_TOUCHSCREEN_W90X900)	+= w90p910_ts.o
>  obj-$(CONFIG_TOUCHSCREEN_TPS6507X)	+= tps6507x-ts.o
> +obj-$(CONFIG_TOUCHSCREEN_CYTTSP_I2C)	+= cyttsp-i2c.o
> diff --git a/drivers/input/touchscreen/cyttsp-i2c.c b/drivers/input/touchscreen/cyttsp-i2c.c
> new file mode 100644
> index 0000000..8397aa1
> --- /dev/null
> +++ b/drivers/input/touchscreen/cyttsp-i2c.c
> @@ -0,0 +1,2016 @@
> +/* Source for:
> + * Cypress TrueTouch(TM) Standard Product I2C touchscreen driver.
> + * drivers/input/touchscreen/cyttsp-i2c.c

To quote Dmitry Torokhov:
"No file names  (and especially paths) in comment blocks please - makes
harder to move stuff around."

> + *
> + * Copyright (C) 2009, 2010 Cypress Semiconductor, Inc.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * version 2, and only version 2, as published by the
> + * Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
> + *
> + * Cypress reserves the right to make changes without further notice
> + * to the materials described herein. Cypress does not assume any
> + * liability arising out of the application described herein.

Sure, Cypress can engineer what they want. The warranty is already
covered by GPL.

> + *
> + * Contact Cypress Semiconductor at www.cypress.com

Maintainer or at least a email ad would be nice I think.

> + *
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +#include <linux/input.h>
> +#include <linux/slab.h>
> +#include <linux/gpio.h>
> +#include <linux/irq.h>
> +#include <linux/interrupt.h>
> +#include <linux/timer.h>
> +#include <linux/workqueue.h>
> +#include <linux/byteorder/generic.h>
> +#include <linux/bitops.h>
> +#ifdef CONFIG_HAS_EARLYSUSPEND
> +#include <linux/earlysuspend.h>
> +#endif /* CONFIG_HAS_EARLYSUSPEND */
> +
> +#define CY_DECLARE_GLOBALS
> +
> +#include <linux/cyttsp.h>

Would it be possible to move cyttsp.h to the local folder?

> +
> +uint32_t cyttsp_tsdebug1 = 0xff;

why can't this be static?
why is it in the header too?

> +module_param_named(tsdebug1, cyttsp_tsdebug1, uint, 0664);
> +
> +/* CY TTSP I2C Driver private data */
> +struct cyttsp {
> +	struct i2c_client *client;
> +	struct input_dev *input;
> +	struct work_struct work;
> +	struct timer_list timer;
> +	struct mutex mutex;
> +	char phys[32];
> +	struct cyttsp_platform_data *platform_data;
> +	u8 num_prv_st_tch;
> +	u16 act_trk[CY_NUM_TRK_ID];
> +	u16 prv_st_tch[CY_NUM_ST_TCH_ID];
> +	u16 prv_mt_tch[CY_NUM_MT_TCH_ID];
> +	u16 prv_mt_pos[CY_NUM_TRK_ID][2];
> +	atomic_t irq_enabled;
> +#ifdef CONFIG_HAS_EARLYSUSPEND
> +	struct early_suspend early_suspend;
> +#endif /* CONFIG_HAS_EARLYSUSPEND */
> +};
> +static u8 irq_cnt;		/* comparison counter with register valuw */
> +static u32 irq_cnt_total;	/* total interrupts */
> +static u32 irq_err_cnt;		/* count number of touch interrupts with err */
> +#define CY_IRQ_CNT_MASK	0x000000FF	/* mapped for sizeof count in reg */
> +#define CY_IRQ_CNT_REG	0x00		/* tt_undef[0]=reg 0x1B - Gen3 only */
> +
> +#ifdef CONFIG_HAS_EARLYSUSPEND
> +static void cyttsp_early_suspend(struct early_suspend *handler);
> +static void cyttsp_late_resume(struct early_suspend *handler);
> +#endif /* CONFIG_HAS_EARLYSUSPEND */
> +
> +static struct workqueue_struct *cyttsp_ts_wq;
> +
> +
> +/* ****************************************************************************
> + * Prototypes for static functions
> + * ************************************************************************** */

star gap, and more than 80 chars

> +static void cyttsp_xy_worker(struct work_struct *work);
> +static irqreturn_t cyttsp_irq(int irq, void *handle);
> +static int cyttsp_inlist(u16 prev_track[],
> +			u8 cur_trk_id, u8 *prev_loc, u8 num_touches);
> +static int cyttsp_next_avail_inlist(u16 cur_trk[],
> +			u8 *new_loc, u8 num_touches);
> +static int cyttsp_putbl(struct cyttsp *ts, int show,
> +			int show_status, int show_version, int show_cid);
> +static int __devinit cyttsp_probe(struct i2c_client *client,
> +			const struct i2c_device_id *id);
> +static int __devexit cyttsp_remove(struct i2c_client *client);
> +static int cyttsp_resume(struct i2c_client *client);
> +static int cyttsp_suspend(struct i2c_client *client, pm_message_t message);

could these prototypes be avoided?

> +
> +/* Static variables */
> +static struct cyttsp_gen3_xydata_t g_xy_data;
> +static struct cyttsp_bootloader_data_t g_bl_data;
> +static struct cyttsp_sysinfo_data_t g_sysinfo_data;
> +static const struct i2c_device_id cyttsp_id[] = {
> +	{ CY_I2C_NAME, 0 },  { }
> +};
> +static u8 bl_cmd[] = {
> +	CY_BL_FILE0, CY_BL_CMD, CY_BL_EXIT,
> +	CY_BL_KEY0, CY_BL_KEY1, CY_BL_KEY2,
> +	CY_BL_KEY3, CY_BL_KEY4, CY_BL_KEY5,
> +	CY_BL_KEY6, CY_BL_KEY7};
> +
> +MODULE_DEVICE_TABLE(i2c, cyttsp_id);
> +
> +static struct i2c_driver cyttsp_driver = {
> +	.driver = {
> +		.name = CY_I2C_NAME,
> +		.owner = THIS_MODULE,
> +	},
> +	.probe = cyttsp_probe,
> +	.remove = __devexit_p(cyttsp_remove),
> +	.suspend = cyttsp_suspend,
> +	.resume = cyttsp_resume,
> +	.id_table = cyttsp_id,
> +};
> +
> +MODULE_LICENSE("GPL");
> +MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard touchscreen driver");
> +MODULE_AUTHOR("Cypress");

Why not re-factoring the whole driver to keep consistency with other
touchpad drivers?
A maintainer to contact or at least a email-ad would be nice I think.
You could use scripts/checkpatch.pl to find some warnings.

[..]


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