input/misc: added lps001wp as internally delivered by ST

This is the driver that I got from Matteo Dameno and Carmine Iascone,
it doesn't currently compile for some missing symbols but I'd better
first commit what I got and then make my own changes over it.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Change-Id: I1dada398da9fe30d5e1f29c9785707c8a84c7a6c
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/24784
Tested-by: Robert MARKLUND <robert.marklund@stericsson.com>
Reviewed-by: Philippe LANGLAIS <philippe.langlais@stericsson.com>

1 files changed, 1280 insertions, 0 deletions

diff --git a/drivers/input/misc/lps001wp_prs.c b/drivers/input/misc/lps001wp_prs.c
new file mode 100644
index 00000000000..6157c474bb4
--- /dev/null
+++ b/drivers/input/misc/lps001wp_prs.c
@@ -0,0 +1,1280 @@
+
+/******************** (C) COPYRIGHT 2010 STMicroelectronics ********************
+*
+* File Name	: lps001wp_prs.c
+* Authors	: MSH - Motion Mems BU - Application Team
+*		: Matteo Dameno (matteo.dameno@st.com)
+*		: Carmine Iascone (carmine.iascone@st.com)
+*		: Both authors are willing to be considered the contact
+*		: and update points for the driver.
+* Version	: V 1.1.1
+* Date		: 2010/11/22
+* Description	: LPS001WP pressure temperature sensor driver
+*
+********************************************************************************
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* THE PRESENT SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES
+* OR CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED, FOR THE SOLE
+* PURPOSE TO SUPPORT YOUR APPLICATION DEVELOPMENT.
+* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
+* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
+* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
+* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
+*
+******************************************************************************
+
+ Revision 0.9.0 01/10/2010:
+	first beta release
+ Revision 1.1.0 05/11/2010:
+	add sysfs management
+ Revision 1.1.1 22/11/2010:
+	moved to input/misc
+******************************************************************************/
+
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/fs.h>
+#include <linux/i2c.h>
+
+#include <linux/input.h>
+#include <linux/uaccess.h>
+
+#include <linux/workqueue.h>
+#include <linux/irq.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+
+#include <linux/input/lps001wp.h>
+
+
+
+#define	DEBUG	1
+
+
+#define	PR_ABS_MAX	USHORT_MAX
+
+#define	PR_ABS_MIN	(u16)(0U)
+#define	PR_DLT_MAX	SHORT_MAX
+#define	PR_DLT_MIN	SHORT_MIN
+#define	TEMP_MAX	SHORT_MAX
+#define TEMP_MIN	SHORT_MIN
+
+
+#define	SENSITIVITY_T_SHIFT	6	/** =	64 LSB/degrC	*/
+#define	SENSITIVITY_P_SHIFT	4	/** =	16 LSB/mbar	*/
+
+
+#define	OUTDATA_REG	0x28
+#define	INDATA_REG	0X30
+
+#define	WHOAMI_LPS001WP_PRS	0xBA	/*	Expctd content for WAI	*/
+
+/*	CONTROL REGISTERS	*/
+#define	WHO_AM_I	0x0F		/*	WhoAmI register		*/
+#define	CTRL_REG1	0x20		/*	power / ODR control reg	*/
+#define	CTRL_REG2	0x21		/*	boot reg		*/
+#define	CTRL_REG3	0x22		/*	interrupt control reg	*/
+
+#define	STATUS_REG	0X27		/*	status reg		*/
+
+#define PRESS_OUT_L	OUTDATA_REG
+
+
+#define	REF_P_L		INDATA_REG	/*	pressure reference	*/
+#define	REF_P_H		0x31		/*	pressure reference	*/
+#define	THS_P_L		0x32		/*	pressure threshold	*/
+#define	THS_P_H		0x33		/*	pressure threshold	*/
+
+#define	INT_CFG		0x34		/*	interrupt config	*/
+#define	INT_SRC		0x35		/*	interrupt source	*/
+#define	INT_ACK		0x36		/*	interrupt acknoledge	*/
+/*	end CONTROL REGISTRES	*/
+
+
+/* Barometer and Termometer output data rate ODR */
+#define	LPS001WP_PRS_ODR_MASK	0x30	/* Mask to access odr bits only	*/
+#define	LPS001WP_PRS_ODR_7_1	0x00	/* 7Hz baro and 1Hz term ODR	*/
+#define	LPS001WP_PRS_ODR_7_7	0x01	/* 7Hz baro and 7Hz term ODR	*/
+#define	LPS001WP_PRS_ODR_12_12	0x11	/* 12.5Hz baro and 12.5Hz term ODR */
+
+
+#define	LPS001WP_PRS_ENABLE_MASK	0x40	/*  */
+#define	LPS001WP_PRS_DIFF_MASK		0x08
+#define LPS001WP_PRS_LPOW_MASK		0x80
+
+#define	LPS001WP_PRS_DIFF_ON		0x08
+#define	LPS001WP_PRS_DIFF_OFF		0x00
+
+#define	LPS001WP_PRS_LPOW_ON		0x80
+#define	LPS001WP_PRS_LPOW_OFF		0x00
+
+#define	FUZZ			0
+#define	FLAT			0
+#define	I2C_RETRY_DELAY		5
+#define	I2C_RETRIES		5
+#define	I2C_AUTO_INCREMENT	0x80
+
+/* RESUME STATE INDICES */
+#define	RES_CTRL_REG1		0
+#define	RES_CTRL_REG2		1
+#define	RES_CTRL_REG3		2
+#define	RES_REF_P_L		3
+#define	RES_REF_P_H		4
+#define	RES_THS_P_L		5
+#define	RES_THS_P_H		6
+#define	RES_INT_CFG		7
+
+#define	RESUME_ENTRIES		8
+/* end RESUME STATE INDICES */
+
+/* Pressure Sensor Operating Mode */
+#define	LPS001WP_PRS_DIFF_ENABLE	1
+#define LPS001WP_PRS_DIFF_DISABLE	0
+#define	LPS001WP_PRS_LPOWER_EN		1
+#define	LPS001WP_PRS_LPOWER_DIS		0
+
+static const struct {
+	unsigned int cutoff_ms;
+	unsigned int mask;
+} lps001wp_prs_odr_table[] = {
+		{80,	LPS001WP_PRS_ODR_12_12 },
+		{143,	LPS001WP_PRS_ODR_7_7 },
+		{1000,	LPS001WP_PRS_ODR_7_1 },
+};
+
+struct lps001wp_prs_data {
+	struct i2c_client *client;
+	struct lps001wp_prs_platform_data *pdata;
+
+	struct mutex lock;
+	struct delayed_work input_work;
+
+	struct input_dev *input_dev;
+
+	int hw_initialized;
+	/* hw_working=-1 means not tested yet */
+	int hw_working;
+	u8 diff_enabled;
+	u8 lpowmode_enabled ;
+
+	atomic_t enabled;
+	int on_before_suspend;
+
+	u8 resume_state[RESUME_ENTRIES];
+
+#ifdef DEBUG
+	u8 reg_addr;
+#endif
+};
+
+struct outputdata {
+	u16 abspress;
+	s16 temperature;
+	s16 deltapress;
+};
+
+
+static int lps001wp_prs_i2c_read(struct lps001wp_prs_data *prs,
+				  u8 *buf, int len)
+{
+	int err;
+	int tries = 0;
+
+	struct i2c_msg msgs[] = {
+		{
+		 .addr = prs->client->addr,
+		 .flags = prs->client->flags & I2C_M_TEN,
+		 .len = 1,
+		 .buf = buf,
+		 },
+		{
+		 .addr = prs->client->addr,
+		 .flags = (prs->client->flags & I2C_M_TEN) | I2C_M_RD,
+		 .len = len,
+		 .buf = buf,
+		 },
+	};
+
+	do {
+		err = i2c_transfer(prs->client->adapter, msgs, 2);
+		if (err != 2)
+			msleep_interruptible(I2C_RETRY_DELAY);
+	} while ((err != 2) && (++tries < I2C_RETRIES));
+
+	if (err != 2) {
+		dev_err(&prs->client->dev, "read transfer error\n");
+		err = -EIO;
+	} else {
+		err = 0;
+	}
+
+	return err;
+}
+
+static int lps001wp_prs_i2c_write(struct lps001wp_prs_data *prs,
+				   u8 *buf, int len)
+{
+	int err;
+	int tries = 0;
+	struct i2c_msg msgs[] = {
+		{
+		 .addr = prs->client->addr,
+		 .flags = prs->client->flags & I2C_M_TEN,
+		 .len = len + 1,
+		 .buf = buf,
+		 },
+	};
+
+	do {
+		err = i2c_transfer(prs->client->adapter, msgs, 1);
+		if (err != 1)
+			msleep_interruptible(I2C_RETRY_DELAY);
+	} while ((err != 1) && (++tries < I2C_RETRIES));
+
+	if (err != 1) {
+		dev_err(&prs->client->dev, "write transfer error\n");
+		err = -EIO;
+	} else {
+		err = 0;
+	}
+
+	return err;
+}
+
+static int lps001wp_prs_i2c_update(struct lps001wp_prs_data *prs,
+			u8 reg_address, u8 mask, u8 new_bit_values)
+{
+	int err = -1;
+	u8 rdbuf[1] = { reg_address };
+	u8 wrbuf[2] = { reg_address , 0x00 };
+
+	u8 init_val;
+	u8 updated_val;
+	err = lps001wp_prs_i2c_read(prs, rdbuf, 1);
+	if (!(err < 0)) {
+		init_val = rdbuf[0];
+		updated_val = ((mask & new_bit_values) | ((~mask) & init_val));
+		wrbuf[1] = updated_val;
+		err = lps001wp_prs_i2c_write(prs, wrbuf, 2);
+	}
+	return err;
+}
+/* */
+
+static int lps001wp_prs_register_write(struct lps001wp_prs_data *prs, u8 *buf,
+		u8 reg_address, u8 new_value)
+{
+	int err = -1;
+
+	/* Sets configuration register at reg_address
+	 *  NOTE: this is a straight overwrite  */
+	buf[0] = reg_address;
+	buf[1] = new_value;
+	err = lps001wp_prs_i2c_write(prs, buf, 1);
+	if (err < 0)
+		return err;
+	return err;
+}
+
+static int lps001wp_prs_register_read(struct lps001wp_prs_data *prs, u8 *buf,
+		u8 reg_address)
+{
+
+	int err = -1;
+	buf[0] = (reg_address);
+	err = lps001wp_prs_i2c_read(prs, buf, 1);
+
+	return err;
+}
+
+static int lps001wp_prs_register_update(struct lps001wp_prs_data *prs, u8 *buf,
+		u8 reg_address, u8 mask, u8 new_bit_values)
+{
+	int err = -1;
+	u8 init_val;
+	u8 updated_val;
+	err = lps001wp_prs_register_read(prs, buf, reg_address);
+	if (!(err < 0)) {
+		init_val = buf[0];
+		updated_val = ((mask & new_bit_values) | ((~mask) & init_val));
+		err = lps001wp_prs_register_write(prs, buf, reg_address,
+				updated_val);
+	}
+	return err;
+}
+
+/* */
+
+
+static int lps001wp_prs_hw_init(struct lps001wp_prs_data *prs)
+{
+	int err = -1;
+	u8 buf[6];
+
+	printk(KERN_DEBUG "%s: hw init start\n", LPS001WP_PRS_DEV_NAME);
+
+	buf[0] = WHO_AM_I;
+	err = lps001wp_prs_i2c_read(prs, buf, 1);
+	if (err < 0)
+		goto error_firstread;
+	else
+		prs->hw_working = 1;
+	if (buf[0] != WHOAMI_LPS001WP_PRS) {
+		err = -1; /* TODO:choose the right coded error */
+		goto error_unknown_device;
+	}
+
+
+	buf[0] = (I2C_AUTO_INCREMENT | INDATA_REG);
+	buf[1] = prs->resume_state[RES_REF_P_L];
+	buf[2] = prs->resume_state[RES_REF_P_H];
+	buf[3] = prs->resume_state[RES_THS_P_L];
+	buf[4] = prs->resume_state[RES_THS_P_H];
+	err = lps001wp_prs_i2c_write(prs, buf, 4);
+	if (err < 0)
+		goto error1;
+
+	buf[0] = (I2C_AUTO_INCREMENT | CTRL_REG1);
+	buf[1] = prs->resume_state[RES_CTRL_REG1];
+	buf[2] = prs->resume_state[RES_CTRL_REG2];
+	buf[3] = prs->resume_state[RES_CTRL_REG3];
+	err = lps001wp_prs_i2c_write(prs, buf, 3);
+	if (err < 0)
+		goto error1;
+
+	buf[0] = INT_CFG;
+	buf[1] = prs->resume_state[RES_INT_CFG];
+	err = lps001wp_prs_i2c_write(prs, buf, 1);
+	if (err < 0)
+		goto error1;
+
+
+	prs->hw_initialized = 1;
+	printk(KERN_DEBUG "%s: hw init done\n", LPS001WP_PRS_DEV_NAME);
+	return 0;
+
+error_firstread:
+	prs->hw_working = 0;
+	dev_warn(&prs->client->dev, "Error reading WHO_AM_I: is device "
+		"available/working?\n");
+	goto error1;
+error_unknown_device:
+	dev_err(&prs->client->dev,
+		"device unknown. Expected: 0x%x,"
+		" Replies: 0x%x\n", WHOAMI_LPS001WP_PRS, buf[0]);
+error1:
+	prs->hw_initialized = 0;
+	dev_err(&prs->client->dev, "hw init error 0x%x,0x%x: %d\n", buf[0],
+			buf[1], err);
+	return err;
+}
+
+static void lps001wp_prs_device_power_off(struct lps001wp_prs_data *prs)
+{
+	int err;
+	u8 buf[2] = { CTRL_REG1, LPS001WP_PRS_PM_OFF };
+
+	err = lps001wp_prs_i2c_write(prs, buf, 1);
+	if (err < 0)
+		dev_err(&prs->client->dev, "soft power off failed: %d\n", err);
+
+	if (prs->pdata->power_off) {
+		prs->pdata->power_off();
+		prs->hw_initialized = 0;
+	}
+	if (prs->hw_initialized) {
+		prs->hw_initialized = 0;
+	}
+
+}
+
+static int lps001wp_prs_device_power_on(struct lps001wp_prs_data *prs)
+{
+	int err = -1;
+
+	if (prs->pdata->power_on) {
+		err = prs->pdata->power_on();
+		if (err < 0) {
+			dev_err(&prs->client->dev,
+					"power_on failed: %d\n", err);
+			return err;
+		}
+	}
+
+	if (!prs->hw_initialized) {
+		err = lps001wp_prs_hw_init(prs);
+		if (prs->hw_working == 1 && err < 0) {
+			lps001wp_prs_device_power_off(prs);
+			return err;
+		}
+	}
+
+	return 0;
+}
+
+
+
+int lps001wp_prs_update_odr(struct lps001wp_prs_data *prs, int poll_interval_ms)
+{
+	int err = -1;
+	int i;
+
+	u8 buf[2];
+	u8 updated_val;
+	u8 init_val;
+	u8 new_val;
+	u8 mask = LPS001WP_PRS_ODR_MASK;
+
+	/* Following, looks for the longest possible odr interval scrolling the
+	 * odr_table vector from the end (shortest interval) backward (longest
+	 * interval), to support the poll_interval requested by the system.
+	 * It must be the longest interval lower then the poll interval.*/
+	for (i = ARRAY_SIZE(lps001wp_prs_odr_table) - 1; i >= 0; i--) {
+		if (lps001wp_prs_odr_table[i].cutoff_ms <= poll_interval_ms)
+			break;
+	}
+
+	new_val = lps001wp_prs_odr_table[i].mask;
+
+	/* If device is currently enabled, we need to write new
+	 *  configuration out to it */
+	if (atomic_read(&prs->enabled)) {
+		buf[0] = CTRL_REG1;
+		err = lps001wp_prs_i2c_read(prs, buf, 1);
+		if (err < 0)
+			goto error;
+		init_val = buf[0];
+		prs->resume_state[RES_CTRL_REG1] = init_val;
+
+		buf[0] = CTRL_REG1;
+		updated_val = ((mask & new_val) | ((~mask) & init_val));
+		buf[1] = updated_val;
+		buf[0] = CTRL_REG1;
+		err = lps001wp_prs_i2c_write(prs, buf, 1);
+		if (err < 0)
+			goto error;
+		prs->resume_state[RES_CTRL_REG1] = updated_val;
+	}
+	return err;
+
+error:
+	dev_err(&prs->client->dev, "update odr failed 0x%x,0x%x: %d\n",
+			buf[0], buf[1], err);
+
+	return err;
+}
+
+static int lps001wp_prs_set_press_reference(struct lps001wp_prs_data *prs,
+				u16 new_reference)
+{
+	int err = -1;
+	u8 const reg_addressL = REF_P_L;
+	u8 const reg_addressH = REF_P_H;
+	u8 bit_valuesL, bit_valuesH;
+	u8 buf[2];
+
+	bit_valuesL = (u8) (new_reference & 0x00FF);
+	bit_valuesH = (u8)((new_reference & 0xFF00) >> 8);
+
+	err = lps001wp_prs_register_write(prs, buf, reg_addressL,
+			bit_valuesL);
+	if (err < 0)
+		return err;
+	err = lps001wp_prs_register_write(prs, buf, reg_addressH,
+			bit_valuesH);
+	if (err < 0) {
+		lps001wp_prs_register_write(prs, buf, reg_addressL,
+				prs->resume_state[RES_REF_P_L]);
+		return err;
+	}
+	prs->resume_state[RES_REF_P_L] = bit_valuesL;
+	prs->resume_state[RES_REF_P_H] = bit_valuesH;
+	return err;
+}
+
+static int lps001wp_prs_get_press_reference(struct lps001wp_prs_data *prs,
+		u16 *buf16)
+{
+	int err = -1;
+
+	u8 bit_valuesL, bit_valuesH;
+	u8 buf[2] = {0};
+	u16 temp = 0;
+
+	err = lps001wp_prs_register_read(prs, buf, REF_P_L);
+	if (err < 0)
+		return err;
+	bit_valuesL = buf[0];
+	err = lps001wp_prs_register_read(prs, buf, REF_P_H);
+	if (err < 0)
+		return err;
+	bit_valuesH = buf[0];
+
+	temp = (((u16) bit_valuesH) << 8);
+	*buf16 = (temp | ((u16) bit_valuesL));
+
+	return err;
+}
+
+static int lps001wp_prs_lpow_manage(struct lps001wp_prs_data *prs, u8 control)
+{
+	int err = -1;
+	u8 buf[2] = {0x00, 0x00};
+	u8 const mask = LPS001WP_PRS_LPOW_MASK;
+	u8 bit_values = LPS001WP_PRS_LPOW_OFF;
+
+	if (control >= LPS001WP_PRS_LPOWER_EN) {
+		bit_values = LPS001WP_PRS_LPOW_ON;
+	}
+
+	err = lps001wp_prs_register_update(prs, buf, CTRL_REG1,
+			mask, bit_values);
+
+	if (err < 0)
+		return err;
+	prs->resume_state[RES_CTRL_REG1] = ((mask & bit_values) |
+			(~mask & prs->resume_state[RES_CTRL_REG1]));
+	if (bit_values == LPS001WP_PRS_LPOW_ON)
+		prs->lpowmode_enabled = 1;
+	else
+		prs->lpowmode_enabled = 0;
+	return err;
+}
+
+static int lps001wp_prs_diffen_manage(struct lps001wp_prs_data *prs, u8 control)
+{
+	int err = -1;
+	u8 buf[2] = {0x00, 0x00};
+	u8 const mask = LPS001WP_PRS_DIFF_MASK;
+	u8 bit_values = LPS001WP_PRS_DIFF_OFF;
+
+	if (control >= LPS001WP_PRS_DIFF_ENABLE) {
+		bit_values = LPS001WP_PRS_DIFF_ON;
+	}
+
+	err = lps001wp_prs_register_update(prs, buf, CTRL_REG1,
+			mask, bit_values);
+
+	if (err < 0)
+		return err;
+	prs->resume_state[RES_CTRL_REG1] = ((mask & bit_values) |
+			(~mask & prs->resume_state[RES_CTRL_REG1]));
+	if (bit_values == LPS001WP_PRS_DIFF_ON)
+		prs->diff_enabled = 1;
+	else
+		prs->diff_enabled = 0;
+	return err;
+}
+
+
+static int lps001wp_prs_get_presstemp_data(struct lps001wp_prs_data *prs,
+						struct outputdata *out)
+{
+	int err = -1;
+	/* Data bytes from hardware	PRESS_OUT_L, PRESS_OUT_H,
+	 *				TEMP_OUT_L, TEMP_OUT_H,
+	 *				DELTA_L, DELTA_H */
+	u8 prs_data[6];
+
+	u16 abspr;
+	s16 temperature, deltapr;
+	int regToRead = 4;
+	prs_data[4] = 0;
+	prs_data[5] = 0;
+
+	if (prs->diff_enabled)
+		regToRead = 6;
+
+	prs_data[0] = (I2C_AUTO_INCREMENT | OUTDATA_REG);
+	err = lps001wp_prs_i2c_read(prs, prs_data, regToRead);
+	if (err < 0)
+		return err;
+
+	abspr = ((((u16) prs_data[1] << 8) | ((u16) prs_data[0])));
+	temperature = ((s16) (((u16) prs_data[3] << 8) | ((u16)prs_data[2])));
+
+	out->abspress = abspr;
+	out->temperature = temperature;
+
+	deltapr = ((s16) (((u16) prs_data[5] << 8) | ((u16)prs_data[4])));
+	out->deltapress = deltapr;
+
+	return err;
+}
+
+static void lps001wp_prs_report_values(struct lps001wp_prs_data *prs,
+					struct outputdata *out)
+{
+	input_report_abs(prs->input_dev, ABS_PR, out->abspress);
+	input_report_abs(prs->input_dev, ABS_TEMP, out->temperature);
+	input_report_abs(prs->input_dev, ABS_DLTPR, out->deltapress);
+	input_sync(prs->input_dev);
+}
+
+static int lps001wp_prs_enable(struct lps001wp_prs_data *prs)
+{
+	int err;
+
+	if (!atomic_cmpxchg(&prs->enabled, 0, 1)) {
+		err = lps001wp_prs_device_power_on(prs);
+		if (err < 0) {
+			atomic_set(&prs->enabled, 0);
+			return err;
+		}
+		schedule_delayed_work(&prs->input_work,
+			msecs_to_jiffies(prs->pdata->poll_interval));
+	}
+
+	return 0;
+}
+
+static int lps001wp_prs_disable(struct lps001wp_prs_data *prs)
+{
+	if (atomic_cmpxchg(&prs->enabled, 1, 0)) {
+		cancel_delayed_work_sync(&prs->input_work);
+		lps001wp_prs_device_power_off(prs);
+	}
+
+	return 0;
+}
+
+static ssize_t read_single_reg(struct device *dev, char *buf, u8 reg)
+{
+	ssize_t ret;
+	struct lps001wp_prs_data *prs = dev_get_drvdata(dev);
+	int rc = 0;
+
+	u8 data = reg;
+	rc = lps001wp_prs_i2c_read(prs, &data, 1);
+	/*TODO: error need to be managed */
+	ret = sprintf(buf, "0x%02x\n", data);
+	return ret;
+
+}
+
+static int write_reg(struct device *dev, const char *buf, u8 reg)
+{
+	int rc = 0;
+	struct lps001wp_prs_data *prs = dev_get_drvdata(dev);
+	u8 x[2];
+	unsigned long val;
+
+	if (strict_strtoul(buf, 16, &val))
+		return -EINVAL;
+
+	x[0] = reg;
+	x[1] = val;
+	rc = lps001wp_prs_i2c_write(prs, x, 1);
+	/*TODO: error need to be managed */
+	return rc;
+}
+
+static ssize_t attr_get_polling_rate(struct device *dev,
+				     struct device_attribute *attr,
+				     char *buf)
+{
+	int val;
+	struct lps001wp_prs_data *prs = dev_get_drvdata(dev);
+	mutex_lock(&prs->lock);
+	val = prs->pdata->poll_interval;
+	mutex_unlock(&prs->lock);
+	return sprintf(buf, "%d\n", val);
+}
+
+static ssize_t attr_set_polling_rate(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t size)
+{
+	struct lps001wp_prs_data *prs = dev_get_drvdata(dev);
+	unsigned long interval_ms;
+
+	if (strict_strtoul(buf, 10, &interval_ms))
+		return -EINVAL;
+	if (!interval_ms)
+		return -EINVAL;
+	mutex_lock(&prs->lock);
+	prs->pdata->poll_interval = interval_ms;
+	lps001wp_prs_update_odr(prs, interval_ms);
+	mutex_unlock(&prs->lock);
+	return size;
+}
+
+static ssize_t attr_get_diff_enable(struct device *dev,
+				     struct device_attribute *attr,
+				     char *buf)
+{
+	u8 val;
+	struct lps001wp_prs_data *prs = dev_get_drvdata(dev);
+	mutex_lock(&prs->lock);
+	val = prs->diff_enabled;
+	mutex_unlock(&prs->lock);
+	return sprintf(buf, "%d\n", val);
+}
+
+static ssize_t attr_set_diff_enable(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t size)
+{
+	struct lps001wp_prs_data *prs = dev_get_drvdata(dev);
+	unsigned long val;
+
+	if (strict_strtoul(buf, 10, &val))
+		return -EINVAL;
+
+	mutex_lock(&prs->lock);
+	lps001wp_prs_diffen_manage(prs, (u8) val);
+	mutex_unlock(&prs->lock);
+	return size;
+}
+
+static ssize_t attr_get_enable(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct lps001wp_prs_data *prs = dev_get_drvdata(dev);
+	int val = atomic_read(&prs->enabled);
+	return sprintf(buf, "%d\n", val);
+}
+
+static ssize_t attr_set_enable(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t size)
+{
+	struct lps001wp_prs_data *prs = dev_get_drvdata(dev);
+	unsigned long val;
+
+	if (strict_strtoul(buf, 10, &val))
+		return -EINVAL;
+
+	if (val)
+		lps001wp_prs_enable(prs);
+	else
+		lps001wp_prs_disable(prs);
+
+	return size;
+}
+
+static ssize_t attr_get_press_ref(struct device *dev,
+				  struct device_attribute *attr, char *buf)
+{
+	int err = -1;
+	struct lps001wp_prs_data *prs = dev_get_drvdata(dev);
+	u16 val = 0;
+
+	mutex_lock(&prs->lock);
+	err = lps001wp_prs_get_press_reference(prs, &val);
+	mutex_unlock(&prs->lock);
+	if (err < 0)
+		return err;
+
+	return sprintf(buf, "%d\n", val);
+}
+
+static ssize_t attr_set_press_ref(struct device *dev,
+				  struct device_attribute *attr,
+				  const char *buf, size_t size)
+{
+	int err = -1;
+	struct lps001wp_prs_data *prs = dev_get_drvdata(dev);
+	unsigned long val = 0;
+
+	if (strict_strtoul(buf, 10, &val))
+		return -EINVAL;
+
+	if (val < PR_ABS_MIN || val > PR_ABS_MAX)
+		return -EINVAL;
+
+	mutex_lock(&prs->lock);
+	err = lps001wp_prs_set_press_reference(prs, val);
+	mutex_unlock(&prs->lock);
+	if (err < 0)
+		return err;
+	return size;
+}
+
+
+static ssize_t attr_get_lowpowmode(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	u8 val;
+	struct lps001wp_prs_data *prs = dev_get_drvdata(dev);
+	mutex_lock(&prs->lock);
+	val = prs->lpowmode_enabled;
+	mutex_unlock(&prs->lock);
+	return sprintf(buf, "%d\n", val);
+}
+
+static ssize_t attr_set_lowpowmode(struct device *dev,
+				   struct device_attribute *attr,
+				   const char *buf, size_t size)
+{
+	int err = -1;
+	struct lps001wp_prs_data *prs = dev_get_drvdata(dev);
+	unsigned long val;
+
+	if (strict_strtoul(buf, 10, &val))
+		return -EINVAL;
+
+	mutex_lock(&prs->lock);
+	err = lps001wp_prs_lpow_manage(prs, (u8) val);
+	mutex_unlock(&prs->lock);
+	if (err < 0)
+		return err;
+	return size;
+}
+
+
+#ifdef DEBUG
+static ssize_t attr_reg_set(struct device *dev, struct device_attribute *attr,
+				const char *buf, size_t size)
+{
+	int rc;
+	struct lps001wp_prs_data *prs = dev_get_drvdata(dev);
+	u8 x[2];
+	unsigned long val;
+
+	if (strict_strtoul(buf, 16, &val))
+		return -EINVAL;
+	mutex_lock(&prs->lock);
+	x[0] = prs->reg_addr;
+	mutex_unlock(&prs->lock);
+	x[1] = val;
+	rc = lps001wp_prs_i2c_write(prs, x, 1);
+	/*TODO: error need to be managed */
+	return size;
+}
+
+static ssize_t attr_reg_get(struct device *dev, struct device_attribute *attr,
+				char *buf)
+{
+	ssize_t ret;
+	struct lps001wp_prs_data *prs = dev_get_drvdata(dev);
+	int rc;
+	u8 data;
+
+	mutex_lock(&prs->lock);
+	data = prs->reg_addr;
+	mutex_unlock(&prs->lock);
+	rc = lps001wp_prs_i2c_read(prs, &data, 1);
+	/*TODO: error need to be managed */
+	ret = sprintf(buf, "0x%02x\n", data);
+	return ret;
+}
+
+static ssize_t attr_addr_set(struct device *dev, struct device_attribute *attr,
+				const char *buf, size_t size)
+{
+	struct lps001wp_prs_data *prs = dev_get_drvdata(dev);
+	unsigned long val;
+	if (strict_strtoul(buf, 16, &val))
+		return -EINVAL;
+	mutex_lock(&prs->lock);
+	prs->reg_addr = val;
+	mutex_unlock(&prs->lock);
+	return size;
+}
+#endif
+
+
+
+static struct device_attribute attributes[] = {
+	__ATTR(pollrate_ms, 0664, attr_get_polling_rate, attr_set_polling_rate),
+	__ATTR(enable, 0664, attr_get_enable, attr_set_enable),
+	__ATTR(diff_enable, 0664, attr_get_diff_enable, attr_set_diff_enable),
+	__ATTR(press_reference, 0664, attr_get_press_ref, attr_set_press_ref),
+	__ATTR(lowpow_enable, 0664, attr_get_lowpowmode, attr_set_lowpowmode),
+#ifdef DEBUG
+	__ATTR(reg_value, 0664, attr_reg_get, attr_reg_set),
+	__ATTR(reg_addr, 0220, NULL, attr_addr_set),
+#endif
+};
+
+static int create_sysfs_interfaces(struct device *dev)
+{
+	int i;
+	for (i = 0; i < ARRAY_SIZE(attributes); i++)
+		if (device_create_file(dev, attributes + i))
+			goto error;
+	return 0;
+
+error:
+	for ( ; i >= 0; i--)
+		device_remove_file(dev, attributes + i);
+	dev_err(dev, "%s:Unable to create interface\n", __func__);
+	return -1;
+}
+
+static int remove_sysfs_interfaces(struct device *dev)
+{
+	int i;
+	for (i = 0; i < ARRAY_SIZE(attributes); i++)
+		device_remove_file(dev, attributes + i);
+	return 0;
+}
+
+
+static void lps001wp_prs_input_work_func(struct work_struct *work)
+{
+	struct lps001wp_prs_data *prs;
+
+	struct outputdata output;
+	struct outputdata *out = &output;
+	int err;
+
+	prs = container_of((struct delayed_work *)work,
+				struct lps001wp_prs_data, input_work);
+
+	mutex_lock(&prs->lock);
+	err = lps001wp_prs_get_presstemp_data(prs, out);
+	if (err < 0)
+		dev_err(&prs->client->dev, "get_pressure_data failed\n");
+	else
+		lps001wp_prs_report_values(prs, out);
+
+	schedule_delayed_work(&prs->input_work,
+				msecs_to_jiffies(prs->pdata->poll_interval));
+	mutex_unlock(&prs->lock);
+}
+
+int lps001wp_prs_input_open(struct input_dev *input)
+{
+	struct lps001wp_prs_data *prs = input_get_drvdata(input);
+
+	return lps001wp_prs_enable(prs);
+}
+
+void lps001wp_prs_input_close(struct input_dev *dev)
+{
+	struct lps001wp_prs_data *prs = input_get_drvdata(dev);
+
+	lps001wp_prs_disable(prs);
+}
+
+
+static int lps001wp_prs_validate_pdata(struct lps001wp_prs_data *prs)
+{
+	prs->pdata->poll_interval = max(prs->pdata->poll_interval,
+					prs->pdata->min_interval);
+
+	/* Enforce minimum polling interval */
+	if (prs->pdata->poll_interval < prs->pdata->min_interval) {
+		dev_err(&prs->client->dev, "minimum poll interval violated\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int lps001wp_prs_input_init(struct lps001wp_prs_data *prs)
+{
+	int err;
+
+	INIT_DELAYED_WORK(&prs->input_work, lps001wp_prs_input_work_func);
+	prs->input_dev = input_allocate_device();
+	if (!prs->input_dev) {
+		err = -ENOMEM;
+		dev_err(&prs->client->dev, "input device allocate failed\n");
+		goto err0;
+	}
+
+	prs->input_dev->open = lps001wp_prs_input_open;
+	prs->input_dev->close = lps001wp_prs_input_close;
+	prs->input_dev->name = LPS001WP_PRS_DEV_NAME;
+	prs->input_dev->id.bustype = BUS_I2C;
+	prs->input_dev->dev.parent = &prs->client->dev;
+
+	input_set_drvdata(prs->input_dev, prs);
+
+	set_bit(EV_ABS, prs->input_dev->evbit);
+
+	input_set_abs_params(prs->input_dev, ABS_PR,
+			PR_ABS_MIN, PR_ABS_MAX, FUZZ, FLAT);
+	input_set_abs_params(prs->input_dev, ABS_TEMP,
+			PR_DLT_MIN, PR_DLT_MAX, FUZZ, FLAT);
+	input_set_abs_params(prs->input_dev, ABS_DLTPR,
+			TEMP_MIN, TEMP_MAX, FUZZ, FLAT);
+
+
+	prs->input_dev->name = "LPS001WP barometer";
+
+	err = input_register_device(prs->input_dev);
+	if (err) {
+		dev_err(&prs->client->dev,
+			"unable to register input polled device %s\n",
+			prs->input_dev->name);
+		goto err1;
+	}
+
+	return 0;
+
+err1:
+	input_free_device(prs->input_dev);
+err0:
+	return err;
+}
+
+static void lps001wp_prs_input_cleanup(struct lps001wp_prs_data *prs)
+{
+	input_unregister_device(prs->input_dev);
+	input_free_device(prs->input_dev);
+}
+
+static int lps001wp_prs_probe(struct i2c_client *client,
+					const struct i2c_device_id *id)
+{
+	struct lps001wp_prs_data *prs;
+	int err = -1;
+	int tempvalue;
+
+	pr_info("%s: probe start.\n", LPS001WP_PRS_DEV_NAME);
+
+	if (client->dev.platform_data == NULL) {
+		dev_err(&client->dev, "platform data is NULL. exiting.\n");
+		err = -ENODEV;
+		goto exit_check_functionality_failed;
+	}
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(&client->dev, "client not i2c capable\n");
+		err = -ENODEV;
+		goto exit_check_functionality_failed;
+	}
+
+	if (!i2c_check_functionality(client->adapter,
+					I2C_FUNC_SMBUS_BYTE |
+					I2C_FUNC_SMBUS_BYTE_DATA |
+					I2C_FUNC_SMBUS_WORD_DATA)) {
+		dev_err(&client->dev, "client not smb-i2c capable:2\n");
+		err = -EIO;
+		goto exit_check_functionality_failed;
+	}
+
+
+	if (!i2c_check_functionality(client->adapter,
+						I2C_FUNC_SMBUS_I2C_BLOCK)){
+		dev_err(&client->dev, "client not smb-i2c capable:3\n");
+		err = -EIO;
+		goto exit_check_functionality_failed;
+	}
+
+
+	prs = kzalloc(sizeof(struct lps001wp_prs_data), GFP_KERNEL);
+	if (prs == NULL) {
+		err = -ENOMEM;
+		dev_err(&client->dev,
+				"failed to allocate memory for module data: "
+					"%d\n", err);
+		goto exit_alloc_data_failed;
+	}
+
+	mutex_init(&prs->lock);
+	mutex_lock(&prs->lock);
+
+	prs->client = client;
+	i2c_set_clientdata(client, prs);
+
+
+	if (i2c_smbus_read_byte(client) < 0) {
+		printk(KERN_ERR "i2c_smbus_read_byte error!!\n");
+		goto err_mutexunlockfreedata;
+	} else {
+		printk(KERN_DEBUG "%s Device detected!\n",
+							LPS001WP_PRS_DEV_NAME);
+	}
+
+	/* read chip id */
+	tempvalue = i2c_smbus_read_word_data(client, WHO_AM_I);
+	if ((tempvalue & 0x00FF) == WHOAMI_LPS001WP_PRS) {
+		printk(KERN_DEBUG "%s I2C driver registered!\n",
+							LPS001WP_PRS_DEV_NAME);
+	} else {
+		prs->client = NULL;
+		printk(KERN_DEBUG "I2C driver not registered!"
+				" Device unknown\n");
+		goto err_mutexunlockfreedata;
+	}
+
+	prs->pdata = kmalloc(sizeof(*prs->pdata), GFP_KERNEL);
+	if (prs->pdata == NULL) {
+		err = -ENOMEM;
+		dev_err(&client->dev,
+				"failed to allocate memory for pdata: %d\n",
+				err);
+		goto err_mutexunlockfreedata;
+	}
+
+	memcpy(prs->pdata, client->dev.platform_data, sizeof(*prs->pdata));
+
+	err = lps001wp_prs_validate_pdata(prs);
+	if (err < 0) {
+		dev_err(&client->dev, "failed to validate platform data\n");
+		goto exit_kfree_pdata;
+	}
+
+	i2c_set_clientdata(client, prs);
+
+
+	if (prs->pdata->init) {
+		err = prs->pdata->init();
+		if (err < 0) {
+			dev_err(&client->dev, "init failed: %d\n", err);
+			goto err2;
+		}
+	}
+
+	memset(prs->resume_state, 0, ARRAY_SIZE(prs->resume_state));
+
+	prs->resume_state[RES_CTRL_REG1] = LPS001WP_PRS_PM_NORMAL;
+	prs->resume_state[RES_CTRL_REG2] = 0x00;
+	prs->resume_state[RES_CTRL_REG3] = 0x00;
+	prs->resume_state[RES_REF_P_L] = 0x00;
+	prs->resume_state[RES_REF_P_H] = 0x00;
+	prs->resume_state[RES_THS_P_L] = 0x00;
+	prs->resume_state[RES_THS_P_H] = 0x00;
+	prs->resume_state[RES_INT_CFG] = 0x00;
+
+	err = lps001wp_prs_device_power_on(prs);
+	if (err < 0) {
+		dev_err(&client->dev, "power on failed: %d\n", err);
+		goto err2;
+	}
+
+	prs->diff_enabled = 0;
+	prs->lpowmode_enabled = 0;
+	atomic_set(&prs->enabled, 1);
+
+	err = lps001wp_prs_update_odr(prs, prs->pdata->poll_interval);
+	if (err < 0) {
+		dev_err(&client->dev, "update_odr failed\n");
+		goto err_power_off;
+	}
+
+	err = lps001wp_prs_input_init(prs);
+	if (err < 0) {
+		dev_err(&client->dev, "input init failed\n");
+		goto err_power_off;
+	}
+
+
+	err = create_sysfs_interfaces(&client->dev);
+	if (err < 0) {
+		dev_err(&client->dev,
+			"device LPS001WP_PRS_DEV_NAME sysfs register failed\n");
+		goto err_input_cleanup;
+	}
+
+
+	lps001wp_prs_device_power_off(prs);
+
+	/* As default, do not report information */
+	atomic_set(&prs->enabled, 0);
+
+
+	mutex_unlock(&prs->lock);
+
+	dev_info(&client->dev, "%s: probed\n", LPS001WP_PRS_DEV_NAME);
+
+	return 0;
+
+/*
+remove_sysfs_int:
+	remove_sysfs_interfaces(&client->dev);
+*/
+err_input_cleanup:
+	lps001wp_prs_input_cleanup(prs);
+err_power_off:
+	lps001wp_prs_device_power_off(prs);
+err2:
+	if (prs->pdata->exit)
+		prs->pdata->exit();
+exit_kfree_pdata:
+	kfree(prs->pdata);
+
+err_mutexunlockfreedata:
+	mutex_unlock(&prs->lock);
+	kfree(prs);
+exit_alloc_data_failed:
+exit_check_functionality_failed:
+	printk(KERN_ERR "%s: Driver Init failed\n", LPS001WP_PRS_DEV_NAME);
+	return err;
+}
+
+static int __devexit lps001wp_prs_remove(struct i2c_client *client)
+{
+	struct lps001wp_prs_data *prs = i2c_get_clientdata(client);
+
+	lps001wp_prs_input_cleanup(prs);
+	lps001wp_prs_device_power_off(prs);
+	remove_sysfs_interfaces(&client->dev);
+
+	if (prs->pdata->exit)
+		prs->pdata->exit();
+	kfree(prs->pdata);
+	kfree(prs);
+
+	return 0;
+}
+
+static int lps001wp_prs_resume(struct i2c_client *client)
+{
+	struct lps001wp_prs_data *prs = i2c_get_clientdata(client);
+
+	if (prs->on_before_suspend)
+		return lps001wp_prs_enable(prs);
+	return 0;
+}
+
+static int lps001wp_prs_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+	struct lps001wp_prs_data *prs = i2c_get_clientdata(client);
+
+	prs->on_before_suspend = atomic_read(&prs->enabled);
+	return lps001wp_prs_disable(prs);
+}
+
+static const struct i2c_device_id lps001wp_prs_id[]
+		= { { LPS001WP_PRS_DEV_NAME, 0}, { },};
+
+MODULE_DEVICE_TABLE(i2c, lps001wp_prs_id);
+
+static struct i2c_driver lps001wp_prs_driver = {
+	.driver = {
+			.name = LPS001WP_PRS_DEV_NAME,
+			.owner = THIS_MODULE,
+	},
+	.probe = lps001wp_prs_probe,
+	.remove = __devexit_p(lps001wp_prs_remove),
+	.id_table = lps001wp_prs_id,
+	.resume = lps001wp_prs_resume,
+	.suspend = lps001wp_prs_suspend,
+};
+
+static int __init lps001wp_prs_init(void)
+{
+	printk(KERN_DEBUG "%s barometer driver: init\n",
+						LPS001WP_PRS_DEV_NAME);
+	return i2c_add_driver(&lps001wp_prs_driver);
+}
+
+static void __exit lps001wp_prs_exit(void)
+{
+	#if DEBUG
+	printk(KERN_DEBUG "%s barometer driver exit\n",
+						LPS001WP_PRS_DEV_NAME);
+	#endif
+	i2c_del_driver(&lps001wp_prs_driver);
+	return;
+}
+
+module_init(lps001wp_prs_init);
+module_exit(lps001wp_prs_exit);
+
+MODULE_DESCRIPTION("STMicrolelectronics lps001wp pressure sensor sysfs driver");
+MODULE_AUTHOR("Matteo Dameno, Carmine Iascone, STMicroelectronics");
+MODULE_LICENSE("GPL");
+