Commit aa142ed7 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Dmitry Torokhov
Browse files

Input: intel-mid-touch - remove driver 



The Moorestown support was removed by commit 1a8359e4 ("x86/mid: Remove
Intel Moorestown").

Remove this leftover.

Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 0eeecf60

drivers/input/touchscreen/Kconfig

+0 −12
Original line number Diff line number Diff line
@@ -546,18 +546,6 @@ config TOUCHSCREEN_INEXIO 
	  To compile this driver as a module, choose M here: the

	  module will be called inexio.



config TOUCHSCREEN_INTEL_MID

	tristate "Intel MID platform resistive touchscreen"

	depends on INTEL_SCU_IPC

	help

	  Say Y here if you have a Intel MID based touchscreen in

	  your system.



	  If unsure, say N.



	  To compile this driver as a module, choose M here: the

	  module will be called intel_mid_touch.



config TOUCHSCREEN_MK712

	tristate "ICS MicroClock MK712 touchscreen"

	help

drivers/input/touchscreen/Makefile

+0 −1
Original line number Diff line number Diff line
@@ -42,7 +42,6 @@ obj-$(CONFIG_TOUCHSCREEN_GOODIX) += goodix.o 
obj-$(CONFIG_TOUCHSCREEN_ILI210X)	+= ili210x.o

obj-$(CONFIG_TOUCHSCREEN_IMX6UL_TSC)	+= imx6ul_tsc.o

obj-$(CONFIG_TOUCHSCREEN_INEXIO)	+= inexio.o

obj-$(CONFIG_TOUCHSCREEN_INTEL_MID)	+= intel-mid-touch.o

obj-$(CONFIG_TOUCHSCREEN_IPROC)		+= bcm_iproc_tsc.o

obj-$(CONFIG_TOUCHSCREEN_LPC32XX)	+= lpc32xx_ts.o

obj-$(CONFIG_TOUCHSCREEN_MAX11801)	+= max11801_ts.o

drivers/input/touchscreen/intel-mid-touch.c

deleted100644 → 0
+0 −654
Original line number Diff line number Diff line 
/*

 * Intel MID Resistive Touch Screen Driver

 *

 * Copyright (C) 2008 Intel Corp

 *

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 *

 * 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.

 *

 * 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.,

 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

 *

 * Questions/Comments/Bug fixes to Sreedhara (sreedhara.ds@intel.com)

 *			    Ramesh Agarwal (ramesh.agarwal@intel.com)

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 *

 * TODO:

 *	review conversion of r/m/w sequences

 */



#include <linux/module.h>

#include <linux/input.h>

#include <linux/interrupt.h>

#include <linux/err.h>

#include <linux/param.h>

#include <linux/slab.h>

#include <linux/platform_device.h>

#include <linux/irq.h>

#include <linux/delay.h>

#include <asm/intel_scu_ipc.h>

#include <linux/device.h>



/* PMIC Interrupt registers */

#define PMIC_REG_ID1		0x00 /* PMIC ID1 register */



/* PMIC Interrupt registers */

#define PMIC_REG_INT		0x04 /* PMIC interrupt register */

#define PMIC_REG_MINT		0x05 /* PMIC interrupt mask register */



/* ADC Interrupt registers */

#define PMIC_REG_ADCINT		0x5F /* ADC interrupt register */

#define PMIC_REG_MADCINT	0x60 /* ADC interrupt mask register */



/* ADC Control registers */

#define PMIC_REG_ADCCNTL1	0x61 /* ADC control register */



/* ADC Channel Selection registers */

#define PMICADDR0		0xA4

#define END_OF_CHANNEL		0x1F



/* ADC Result register */

#define PMIC_REG_ADCSNS0H	0x64



/* ADC channels for touch screen */

#define MRST_TS_CHAN10		0xA /* Touch screen X+ connection */

#define MRST_TS_CHAN11		0xB /* Touch screen X- connection */

#define MRST_TS_CHAN12		0xC /* Touch screen Y+ connection */

#define MRST_TS_CHAN13		0xD /* Touch screen Y- connection */



/* Touch screen channel BIAS constants */

#define MRST_XBIAS		0x20

#define MRST_YBIAS		0x40

#define MRST_ZBIAS		0x80



/* Touch screen coordinates */

#define MRST_X_MIN		10

#define MRST_X_MAX		1024

#define MRST_X_FUZZ		5

#define MRST_Y_MIN		10

#define MRST_Y_MAX		1024

#define MRST_Y_FUZZ		5

#define MRST_PRESSURE_MIN	0

#define MRST_PRESSURE_NOMINAL	50

#define MRST_PRESSURE_MAX	100



#define WAIT_ADC_COMPLETION	10 /* msec */



/* PMIC ADC round robin delays */

#define ADC_LOOP_DELAY0		0x0 /* Continuous loop */

#define ADC_LOOP_DELAY1		0x1 /* 4.5  ms approximate */



/* PMIC Vendor Identifiers */

#define PMIC_VENDOR_FS		0 /* PMIC vendor FreeScale */

#define PMIC_VENDOR_MAXIM	1 /* PMIC vendor MAXIM */

#define PMIC_VENDOR_NEC		2 /* PMIC vendor NEC */

#define MRSTOUCH_MAX_CHANNELS	32 /* Maximum ADC channels */



/* Touch screen device structure */

struct mrstouch_dev {

	struct device *dev; /* device associated with touch screen */

	struct input_dev *input;

	char phys[32];

	u16 asr;		/* Address selection register */

	int irq;

	unsigned int vendor;	/* PMIC vendor */

	unsigned int rev;	/* PMIC revision */



	int (*read_prepare)(struct mrstouch_dev *tsdev);

	int (*read)(struct mrstouch_dev *tsdev, u16 *x, u16 *y, u16 *z);

	int (*read_finish)(struct mrstouch_dev *tsdev);

};





/*************************** NEC and Maxim Interface ************************/



static int mrstouch_nec_adc_read_prepare(struct mrstouch_dev *tsdev)

{

	return intel_scu_ipc_update_register(PMIC_REG_MADCINT, 0, 0x20);

}



/*

 * Enables PENDET interrupt.

 */

static int mrstouch_nec_adc_read_finish(struct mrstouch_dev *tsdev)

{

	int err;



	err = intel_scu_ipc_update_register(PMIC_REG_MADCINT, 0x20, 0x20);

	if (!err)

		err = intel_scu_ipc_update_register(PMIC_REG_ADCCNTL1, 0, 0x05);



	return err;

}



/*

 * Reads PMIC ADC touch screen result

 * Reads ADC storage registers for higher 7 and lower 3 bits and

 * converts the two readings into a single value and turns off gain bit

 */

static int mrstouch_ts_chan_read(u16 offset, u16 chan, u16 *vp, u16 *vm)

{

	int err;

	u16 result;

	u32 res;



	result = PMIC_REG_ADCSNS0H + offset;



	if (chan == MRST_TS_CHAN12)

		result += 4;



	err = intel_scu_ipc_ioread32(result, &res);

	if (err)

		return err;



	/* Mash the bits up */



	*vp = (res & 0xFF) << 3;	/* Highest 7 bits */

	*vp |= (res >> 8) & 0x07;	/* Lower 3 bits */

	*vp &= 0x3FF;



	res >>= 16;



	*vm = (res & 0xFF) << 3;	/* Highest 7 bits */

	*vm |= (res >> 8) & 0x07;	/* Lower 3 bits */

	*vm &= 0x3FF;



	return 0;

}



/*

 * Enables X, Y and Z bias values

 * Enables YPYM for X channels and XPXM for Y channels

 */

static int mrstouch_ts_bias_set(uint offset, uint bias)

{

	int count;

	u16 chan, start;

	u16 reg[4];

	u8 data[4];



	chan = PMICADDR0 + offset;

	start = MRST_TS_CHAN10;



	for (count = 0; count <= 3; count++) {

		reg[count] = chan++;

		data[count] = bias | (start + count);

	}



	return intel_scu_ipc_writev(reg, data, 4);

}



/* To read touch screen channel values */

static int mrstouch_nec_adc_read(struct mrstouch_dev *tsdev,

				 u16 *x, u16 *y, u16 *z)

{

	int err;

	u16 xm, ym, zm;



	/* configure Y bias for X channels */

	err = mrstouch_ts_bias_set(tsdev->asr, MRST_YBIAS);

	if (err)

		goto ipc_error;



	msleep(WAIT_ADC_COMPLETION);



	/* read x+ and x- channels */

	err = mrstouch_ts_chan_read(tsdev->asr, MRST_TS_CHAN10, x, &xm);

	if (err)

		goto ipc_error;



	/* configure x bias for y channels */

	err = mrstouch_ts_bias_set(tsdev->asr, MRST_XBIAS);

	if (err)

		goto ipc_error;



	msleep(WAIT_ADC_COMPLETION);



	/* read y+ and y- channels */

	err = mrstouch_ts_chan_read(tsdev->asr, MRST_TS_CHAN12, y, &ym);

	if (err)

		goto ipc_error;



	/* configure z bias for x and y channels */

	err = mrstouch_ts_bias_set(tsdev->asr, MRST_ZBIAS);

	if (err)

		goto ipc_error;



	msleep(WAIT_ADC_COMPLETION);



	/* read z+ and z- channels */

	err = mrstouch_ts_chan_read(tsdev->asr, MRST_TS_CHAN10, z, &zm);

	if (err)

		goto ipc_error;



	return 0;



ipc_error:

	dev_err(tsdev->dev, "ipc error during adc read\n");

	return err;

}





/*************************** Freescale Interface ************************/



static int mrstouch_fs_adc_read_prepare(struct mrstouch_dev *tsdev)

{

	int err, count;

	u16 chan;

	u16 reg[5];

	u8 data[5];



	/* Stop the ADC */

	err = intel_scu_ipc_update_register(PMIC_REG_MADCINT, 0x00, 0x02);

	if (err)

		goto ipc_error;



	chan = PMICADDR0 + tsdev->asr;



	/* Set X BIAS */

	for (count = 0; count <= 3; count++) {

		reg[count] = chan++;

		data[count] = 0x2A;

	}

	reg[count] =  chan++; /* Dummy */

	data[count] = 0;



	err = intel_scu_ipc_writev(reg, data, 5);

	if (err)

		goto ipc_error;



	msleep(WAIT_ADC_COMPLETION);



	/* Set Y BIAS */

	for (count = 0; count <= 3; count++) {

		reg[count] = chan++;

		data[count] = 0x4A;

	}

	reg[count] = chan++; /* Dummy */

	data[count] = 0;



	err = intel_scu_ipc_writev(reg, data, 5);

	if (err)

		goto ipc_error;



	msleep(WAIT_ADC_COMPLETION);



	/* Set Z BIAS */

	err = intel_scu_ipc_iowrite32(chan + 2, 0x8A8A8A8A);

	if (err)

		goto ipc_error;



	msleep(WAIT_ADC_COMPLETION);



	return 0;



ipc_error:

	dev_err(tsdev->dev, "ipc error during %s\n", __func__);

	return err;

}



static int mrstouch_fs_adc_read(struct mrstouch_dev *tsdev,

				u16 *x, u16 *y, u16 *z)

{

	int err;

	u16 result;

	u16 reg[4];

	u8 data[4];



	result = PMIC_REG_ADCSNS0H + tsdev->asr;



	reg[0] = result + 4;

	reg[1] = result + 5;

	reg[2] = result + 16;

	reg[3] = result + 17;



	err = intel_scu_ipc_readv(reg, data, 4);

	if (err)

		goto ipc_error;



	*x = data[0] << 3; /* Higher 7 bits */

	*x |= data[1] & 0x7; /* Lower 3 bits */

	*x &= 0x3FF;



	*y = data[2] << 3; /* Higher 7 bits */

	*y |= data[3] & 0x7; /* Lower 3 bits */

	*y &= 0x3FF;



	/* Read Z value */

	reg[0] = result + 28;

	reg[1] = result + 29;



	err = intel_scu_ipc_readv(reg, data, 4);

	if (err)

		goto ipc_error;



	*z = data[0] << 3; /* Higher 7 bits */

	*z |= data[1] & 0x7; /* Lower 3 bits */

	*z &= 0x3FF;



	return 0;



ipc_error:

	dev_err(tsdev->dev, "ipc error during %s\n", __func__);

	return err;

}



static int mrstouch_fs_adc_read_finish(struct mrstouch_dev *tsdev)

{

	int err, count;

	u16 chan;

	u16 reg[5];

	u8 data[5];



	/* Clear all TS channels */

	chan = PMICADDR0 + tsdev->asr;

	for (count = 0; count <= 4; count++) {

		reg[count] = chan++;

		data[count] = 0;

	}

	err = intel_scu_ipc_writev(reg, data, 5);

	if (err)

		goto ipc_error;



	for (count = 0; count <= 4; count++) {

		reg[count] = chan++;

		data[count] = 0;

	}

	err = intel_scu_ipc_writev(reg, data, 5);

	if (err)

		goto ipc_error;



	err = intel_scu_ipc_iowrite32(chan + 2, 0x00000000);

	if (err)

		goto ipc_error;



	/* Start ADC */

	err = intel_scu_ipc_update_register(PMIC_REG_MADCINT, 0x02, 0x02);

	if (err)

		goto ipc_error;



	return 0;



ipc_error:

	dev_err(tsdev->dev, "ipc error during %s\n", __func__);

	return err;

}



static void mrstouch_report_event(struct input_dev *input,

			unsigned int x, unsigned int y, unsigned int z)

{

	if (z > MRST_PRESSURE_NOMINAL) {

		/* Pen touched, report button touch and coordinates */

		input_report_key(input, BTN_TOUCH, 1);

		input_report_abs(input, ABS_X, x);

		input_report_abs(input, ABS_Y, y);

	} else {

		input_report_key(input, BTN_TOUCH, 0);

	}



	input_report_abs(input, ABS_PRESSURE, z);

	input_sync(input);

}



/* PENDET interrupt handler */

static irqreturn_t mrstouch_pendet_irq(int irq, void *dev_id)

{

	struct mrstouch_dev *tsdev = dev_id;

	u16 x, y, z;



	/*

	 * Should we lower thread priority? Probably not, since we are

	 * not spinning but sleeping...

	 */



	if (tsdev->read_prepare(tsdev))

		goto out;



	do {

		if (tsdev->read(tsdev, &x, &y, &z))

			break;



		mrstouch_report_event(tsdev->input, x, y, z);

	} while (z > MRST_PRESSURE_NOMINAL);



	tsdev->read_finish(tsdev);



out:

	return IRQ_HANDLED;

}



/* Utility to read PMIC ID */

static int mrstouch_read_pmic_id(uint *vendor, uint *rev)

{

	int err;

	u8 r;



	err = intel_scu_ipc_ioread8(PMIC_REG_ID1, &r);

	if (err)

		return err;



	*vendor = r & 0x7;

	*rev = (r >> 3) & 0x7;



	return 0;

}



/*

 * Parse ADC channels to find end of the channel configured by other ADC user

 * NEC and MAXIM requires 4 channels and FreeScale needs 18 channels

 */

static int mrstouch_chan_parse(struct mrstouch_dev *tsdev)

{

	int found = 0;

	int err, i;

	u8 r8;



	for (i = 0; i < MRSTOUCH_MAX_CHANNELS; i++) {

		err = intel_scu_ipc_ioread8(PMICADDR0 + i, &r8);

		if (err)

			return err;



		if (r8 == END_OF_CHANNEL) {

			found = i;

			break;

		}

	}



	if (tsdev->vendor == PMIC_VENDOR_FS) {

		if (found > MRSTOUCH_MAX_CHANNELS - 18)

			return -ENOSPC;

	} else {

		if (found > MRSTOUCH_MAX_CHANNELS - 4)

			return -ENOSPC;

	}



	return found;

}





/*

 * Writes touch screen channels to ADC address selection registers

 */

static int mrstouch_ts_chan_set(uint offset)

{

	u16 chan;



	int ret, count;



	chan = PMICADDR0 + offset;

	for (count = 0; count <= 3; count++) {

		ret = intel_scu_ipc_iowrite8(chan++, MRST_TS_CHAN10 + count);

		if (ret)

			return ret;

	}

	return intel_scu_ipc_iowrite8(chan++, END_OF_CHANNEL);

}



/* Initialize ADC */

static int mrstouch_adc_init(struct mrstouch_dev *tsdev)

{

	int err, start;

	u8 ra, rm;



	err = mrstouch_read_pmic_id(&tsdev->vendor, &tsdev->rev);

	if (err) {

		dev_err(tsdev->dev, "Unable to read PMIC id\n");

		return err;

	}



	switch (tsdev->vendor) {

	case PMIC_VENDOR_NEC:

	case PMIC_VENDOR_MAXIM:

		tsdev->read_prepare = mrstouch_nec_adc_read_prepare;

		tsdev->read = mrstouch_nec_adc_read;

		tsdev->read_finish = mrstouch_nec_adc_read_finish;

		break;



	case PMIC_VENDOR_FS:

		tsdev->read_prepare = mrstouch_fs_adc_read_prepare;

		tsdev->read = mrstouch_fs_adc_read;

		tsdev->read_finish = mrstouch_fs_adc_read_finish;

		break;



	default:

		dev_err(tsdev->dev,

			"Unsupported touchscreen: %d\n", tsdev->vendor);

		return -ENXIO;

	}



	start = mrstouch_chan_parse(tsdev);

	if (start < 0) {

		dev_err(tsdev->dev, "Unable to parse channels\n");

		return start;

	}



	tsdev->asr = start;



	/*

	 * ADC power on, start, enable PENDET and set loop delay

	 * ADC loop delay is set to 4.5 ms approximately

	 * Loop delay more than this results in jitter in adc readings

	 * Setting loop delay to 0 (continuous loop) in MAXIM stops PENDET

	 * interrupt generation sometimes.

	 */



	if (tsdev->vendor == PMIC_VENDOR_FS) {

		ra = 0xE0 | ADC_LOOP_DELAY0;

		rm = 0x5;

	} else {

		/* NEC and MAXIm not consistent with loop delay 0 */

		ra = 0xE0 | ADC_LOOP_DELAY1;

		rm = 0x0;



		/* configure touch screen channels */

		err = mrstouch_ts_chan_set(tsdev->asr);

		if (err)

			return err;

	}



	err = intel_scu_ipc_update_register(PMIC_REG_ADCCNTL1, ra, 0xE7);

	if (err)

		return err;



	err = intel_scu_ipc_update_register(PMIC_REG_MADCINT, rm, 0x03);

	if (err)

		return err;



	return 0;

}





/* Probe function for touch screen driver */

static int mrstouch_probe(struct platform_device *pdev)

{

	struct mrstouch_dev *tsdev;

	struct input_dev *input;

	int err;

	int irq;



	irq = platform_get_irq(pdev, 0);

	if (irq < 0) {

		dev_err(&pdev->dev, "no interrupt assigned\n");

		return -EINVAL;

	}



	tsdev = devm_kzalloc(&pdev->dev, sizeof(struct mrstouch_dev),

			     GFP_KERNEL);

	if (!tsdev) {

		dev_err(&pdev->dev, "unable to allocate memory\n");

		return -ENOMEM;

	}



	input = devm_input_allocate_device(&pdev->dev);

	if (!input) {

		dev_err(&pdev->dev, "unable to allocate input device\n");

		return -ENOMEM;

	}



	tsdev->dev = &pdev->dev;

	tsdev->input = input;

	tsdev->irq = irq;



	snprintf(tsdev->phys, sizeof(tsdev->phys),

		 "%s/input0", dev_name(tsdev->dev));



	err = mrstouch_adc_init(tsdev);

	if (err) {

		dev_err(&pdev->dev, "ADC initialization failed\n");

		return err;

	}



	input->name = "mrst_touchscreen";

	input->phys = tsdev->phys;

	input->dev.parent = tsdev->dev;



	input->id.vendor = tsdev->vendor;

	input->id.version = tsdev->rev;



	input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);

	input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);



	input_set_abs_params(tsdev->input, ABS_X,

			     MRST_X_MIN, MRST_X_MAX, MRST_X_FUZZ, 0);

	input_set_abs_params(tsdev->input, ABS_Y,

			     MRST_Y_MIN, MRST_Y_MAX, MRST_Y_FUZZ, 0);

	input_set_abs_params(tsdev->input, ABS_PRESSURE,

			     MRST_PRESSURE_MIN, MRST_PRESSURE_MAX, 0, 0);



	err = devm_request_threaded_irq(&pdev->dev, tsdev->irq, NULL,

					mrstouch_pendet_irq, IRQF_ONESHOT,

					"mrstouch", tsdev);

	if (err) {

		dev_err(tsdev->dev, "unable to allocate irq\n");

		return err;

	}



	err = input_register_device(tsdev->input);

	if (err) {

		dev_err(tsdev->dev, "unable to register input device\n");

		return err;

	}



	return 0;

}



static struct platform_driver mrstouch_driver = {

	.driver = {

		.name	= "pmic_touch",

	},

	.probe		= mrstouch_probe,

};

module_platform_driver(mrstouch_driver);



MODULE_AUTHOR("Sreedhara Murthy. D.S, sreedhara.ds@intel.com");

MODULE_DESCRIPTION("Intel Moorestown Resistive Touch Screen Driver");

MODULE_LICENSE("GPL");