Hello Dmitry, > -----Original Message----- > From: Dmitry Torokhov [mailto:dmitry.torokhov@xxxxxxxxx] > Sent: Tuesday, July 13, 2010 12:56 AM > To: Trilok Soni > Cc: Kevin McNeely; David Brown; Fred; Samuel Ortiz; Eric Miao; Mark > Brown; Simtec Linux Team; Arnaud Patard; Antonio Ospite; Henrik > Rydberg; linux-input@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > linux-i2c@xxxxxxxxxxxxxxx; khali@xxxxxxxxxxxx; linux-arm- > msm@xxxxxxxxxxxxxxx > Subject: Re: [PATCH] i2c: cyttsp i2c touchscreen driver init submit > > On Tue, Jul 13, 2010 at 01:01:32PM +0530, Trilok Soni wrote: > > Hi Kevin, > > > > Thanks for posting this driver. > > > > Adding Jean Delvar for i2c bits. > > > > On 7/13/2010 2:26 AM, Kevin McNeely wrote: > > > From: Fred <fwk@xxxxxxxxxxxxxxxxxxxxxxxxx> > > > > E-mail id looks wrong. Do you mean fwk@xxxxxxxxxxx? > > > > > > > > This is a new touchscreen driver for the Cypress Semiconductor > > > cyttsp family of devices. This driver is for the i2c version > > > of cyttsp parts. > > > > Please explain in commit text which exact version of the chips this > driver is supporting. > > It is hard to make out that from this text. > > > > > > Signed-off-by: Kevin McNeely <kev@xxxxxxxxxxx> > > > --- > > > drivers/input/touchscreen/Kconfig | 13 + > > > drivers/input/touchscreen/Makefile | 1 + > > > drivers/input/touchscreen/cyttsp-i2c.c | 2016 > ++++++++++++++++++++++++++++++++ > > > include/linux/cyttsp.h | 649 ++++++++++ > > > > Please move this file to include/linux/input directory. > > > > Or even keep it in drivers/input/touchscreen/ > The cyttsp.h file has been reduced to only information required by board configuration files. > > > > > > > > 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 > > > > Do we need to provide this if it is no by default? > > > > > + 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. > > > > What is TTSP? > > > > > + > > > + If unsure, say N. > > > + > > > + To compile this driver as a module, choose M here: the > > > + module will be called cyttsp_i2c. > > > + > > > endif > > > > Since there is SPI part should we prepare for the support and split > bus-independent parts off? Are you working on SPI support? > This has been done in refactored code that I will submit. The new code has common code core file and separate I2C and SPI specific files. Core and I2C/SPI code will be part of next submission. > > > > > 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 > > > > No file paths please. Already commented on it by Christoph. > > > > > + * > > > + * 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. > > > + * > > > + * Contact Cypress Semiconductor at www.cypress.com > > > > I would like Dmitry to comment on it. Dmitry? > > > > Not a lwayer but I do not really see an issue here. It is still GPL and > they as copyright holders obviously can modify the code. What exactly > troubles you here? > > This paragraph has been removed from headers. > > > + * > > > + */ > > > + > > > +#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 */ > > > > We don't have early suspend support yet into the mainline kernel. > Please remove this code from the driver. > > > > > + > > > +#define CY_DECLARE_GLOBALS > > > > Could you please explain what it does? > > > > > + > > > +#include <linux/cyttsp.h> > > > + > > > +uint32_t cyttsp_tsdebug1 = 0xff; > > > +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 > */ > > > > s/valuw/value > > > > > +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; > > > > Why there are so many global variables lying around? > > > > > + > > > + > > > +/* > *********************************************************************** > ***** > > > + * Prototypes for static functions > > > + * > *********************************************************************** > *** */ > > > +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); > > > > Please re-order the functions in the driver such a way so that you > don't need have these prototypes here. > > > > > + > > > +/* 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; > > > > again globals? > > > > > +static const struct i2c_device_id cyttsp_id[] = { > > > + { CY_I2C_NAME, 0 }, { } > > > > Why dont you put ,{} at the next line. > > > > > +}; > > > > You should not put driver name above, but it should be something like > real chip name. > > > > Say cy8ctXXX. > > > > > +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}; > > > > and what these keys does? > > > > > + > > > +MODULE_DEVICE_TABLE(i2c, cyttsp_id); > > > > Why it is not with cyttsp_id above? > > > > > + > > > +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"); > > > > MODULE_ALIAS? > > > > > + > > > +static ssize_t cyttsp_irq_status(struct device *dev, > > > + struct device_attribute *attr, char *buf) > > > +{ > > > + struct i2c_client *client = container_of(dev, struct i2c_client, > dev); > > > + struct cyttsp *ts = i2c_get_clientdata(client); > > > + return sprintf(buf, "%u\n", atomic_read(&ts->irq_enabled)); > > > +} > > > + > > > +static ssize_t cyttsp_irq_enable(struct device *dev, > > > + struct device_attribute *attr, > > > + const char *buf, size_t size) > > > +{ > > > + struct i2c_client *client = container_of(dev, struct i2c_client, > dev); > > > + struct cyttsp *ts = i2c_get_clientdata(client); > > > + int err = 0; > > > + unsigned long value; > > > + > > > + if (size > 2) > > > + return -EINVAL; > > > + > > > + err = strict_strtoul(buf, 10, &value); > > > + if (err != 0) > > > + return err; > > > + > > > + switch (value) { > > > + case 0: > > > + if (atomic_cmpxchg(&ts->irq_enabled, 1, 0)) { > > > + pr_info("touch irq disabled!\n"); > > > + disable_irq_nosync(ts->client->irq); > > I do not believe that this achieves what you want.., You may reschedule > between cmpxchg and disable_irq_nosync(). > This code has been removed from new code to be submitted. > > Haven't looked any further yet... > > -- > Dmitry Thank you Dmitry for your review. --------------------------------------------------------------- This message and any attachments may contain Cypress (or its subsidiaries) confidential information. 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