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SubjectRE: [PATCH] input: misc: add lps001wp_prs driver
Hello,

> -----Original Message-----
> From: linux-input-owner@vger.kernel.org [mailto:linux-input-
> owner@vger.kernel.org] On Behalf Of mems applications
> Sent: Monday, November 29, 2010 10:13 PM
> To: dmitry.torokhov@gmail.com
> Cc: linux-input@vger.kernel.org; linux-kernel@vger.kernel.org;
> matteo.dameno@st.com; carmine.iascone@st.com; mems
> Subject: [PATCH] input: misc: add lps001wp_prs driver
>
> From: mems <mems@mems-laptopT43.(none)>
>
> Added STMicroelectronics LPS001WP pressure sensor device driver
It is a barometric pressure sensor is my understanding correct?

>
> Signed-off-by: Matteo Dameno <matteo.dameno@st.com>
> ---
> drivers/input/misc/Kconfig | 10 +
> drivers/input/misc/Makefile | 2 +
> drivers/input/misc/lps001wp_prs.c | 1288
> +++++++++++++++++++++++++++++++++++++
> include/linux/input/lps001wp.h | 82 +++
> 4 files changed, 1382 insertions(+), 0 deletions(-)
> create mode 100644 drivers/input/misc/lps001wp_prs.c
> create mode 100644 include/linux/input/lps001wp.h
>
> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
> index b99b8cb..689856a 100644
> --- a/drivers/input/misc/Kconfig
> +++ b/drivers/input/misc/Kconfig
> @@ -448,4 +448,14 @@ config INPUT_ADXL34X_SPI
> To compile this driver as a module, choose M here: the
> module will be called adxl34x-spi.
>
> +config INPUT_LPS001WP_PRS
> + tristate "STMicro LPS001WP Pressure Temperature Sensor"
> + depends on I2C
> + default n
You may consider removing it as anyways it is the default.

> + help
> + If you say yes here you get support for the
> + STM LPS001D Barometer/Termometer on I2C bus.
> + This driver can also be built as a module (choose M).
> + If so, the module will be called lps001wp_prs.
> +
> endif
> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
> index 1fe1f6c..0165e60 100644
> --- a/drivers/input/misc/Makefile
> +++ b/drivers/input/misc/Makefile
> @@ -42,4 +42,6 @@ obj-$(CONFIG_INPUT_WINBOND_CIR) += winbond-
> cir.o
> obj-$(CONFIG_INPUT_WISTRON_BTNS) += wistron_btns.o
> obj-$(CONFIG_INPUT_WM831X_ON) += wm831x-on.o
> obj-$(CONFIG_INPUT_YEALINK) += yealink.o
> +obj-$(CONFIG_INPUT_LPS001WP_PRS) += lps001wp_prs.o
> +
>
> diff --git a/drivers/input/misc/lps001wp_prs.c
> b/drivers/input/misc/lps001wp_prs.c
> new file mode 100644
> index 0000000..e1a3a95
> --- /dev/null
> +++ b/drivers/input/misc/lps001wp_prs.c
> @@ -0,0 +1,1288 @@
> +
> +/******************** (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 : 05/11/2010
> +* Description : LPS001WP 6D module sensor API
> +*
> +*************************************************************************
> *******
> +*
> +* 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.
> +*
> +* THIS SOFTWARE IS SPECIFICALLY DESIGNED FOR EXCLUSIVE USE WITH ST PARTS.
> +*
> +*************************************************************************
> *****
> +
> + 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
> + updated USHRT_MAX,SHRT_MAX,SHRT_MIN macros
> +*************************************************************************
> *****/
> +
> +#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/slab.h>
> +#include <linux/kernel.h>
> +
> +#include <linux/input/lps001wp.h>
> +
> +
> +
> +#define DEBUG 1
> +
> +
> +#define PR_ABS_MAX USHRT_MAX
> +
> +#define PR_ABS_MIN (u16)(0U)
> +#define PR_DLT_MAX SHRT_MAX
> +#define PR_DLT_MIN SHRT_MIN
> +#define TEMP_MAX SHRT_MAX
> +#define TEMP_MIN SHRT_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;
> +
Stray space.
> +
> + 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) {
> + ;
Did not understand this.

> + 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();
You may want to explain what poweron does.

> + 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;
Is there a limitation on the limit. Say if the rate
> +
> + 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);
What happens when the interval is smaller than the output rate is the values repeated?

> + 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)
> +{
Power management through sysfs may not be needed if the power hooks are used.

> + 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
Do you really want the debug code?
Feel free to ignore this kind of a comment.

> +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);
This may not be a good idea. We shouldn't free after unregister.

> +}
> +
> +static int lps001wp_prs_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
You may consider __devinit
> +{
> + 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 misc
> driver");
> +MODULE_AUTHOR("Matteo Dameno, Carmine Iascone, STMicroelectronics");
> +MODULE_LICENSE("GPL");
> +
> diff --git a/include/linux/input/lps001wp.h
> b/include/linux/input/lps001wp.h
> new file mode 100644
> index 0000000..4c3e307
> --- /dev/null
> +++ b/include/linux/input/lps001wp.h
> @@ -0,0 +1,82 @@
> +/******************** (C) COPYRIGHT 2010 STMicroelectronics
> ********************
> +*
> +* File Name : lps001wp.h
> +* Authors : MSH - Motion Mems BU - Application Team
> +* : Matteo Dameno (matteo.dameno@st.com)*
> +* : Carmine Iascone (carmine.iascone@st.com)
> +* Version : V 1.1.1
> +* Date : 05/11/2010
> +* Description : LPS001WP 6D module sensor API
> +*
> +*************************************************************************
> *******
> +*
> +* 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.
> +*
> +* THIS SOFTWARE IS SPECIFICALLY DESIGNED FOR EXCLUSIVE USE WITH ST PARTS.
> +*
> +*************************************************************************
> ******/
> +
> +#ifndef __LPS001WP_H__
> +#define __LPS001WP_H__
> +
> +
> +#include <linux/input.h>
> +
> +#define SAD0L 0x00
> +#define SAD0H 0x01
> +#define LPS001WP_PRS_I2C_SADROOT 0x2E
> +#define LPS001WP_PRS_I2C_SAD_L
> ((LPS001WP_PRS_I2C_SADROOT<<1)|SAD0L)
> +#define LPS001WP_PRS_I2C_SAD_H
> ((LPS001WP_PRS_I2C_SADROOT<<1)|SAD0H)
> +#define LPS001WP_PRS_DEV_NAME "lps001wp_prs_sysfs"
> +
> +/* input define mappings */
> +#define ABS_PR ABS_PRESSURE
> +#define ABS_TEMP ABS_GAS
> +#define ABS_DLTPR ABS_MISC
> +
> +
> +
> +/************************************************/
> +/* Pressure section defines */
> +/************************************************/
> +
> +/* Pressure Sensor Operating Mode */
> +#define LPS001WP_PRS_ENABLE 0x01
> +#define LPS001WP_PRS_DISABLE 0x00
> +
> +
> +
> +
> +#define LPS001WP_PRS_PM_NORMAL 0x40
> +#define LPS001WP_PRS_PM_OFF LPS001WP_PRS_DISABLE
> +
> +#define SENSITIVITY_T 64 /** = 64 LSB/degrC */
> +#define SENSITIVITY_P 16 /** = 16 LSB/mbar */
> +
> +
> +#ifdef __KERNEL__
> +struct lps001wp_prs_platform_data {
> +
> + int poll_interval;
> + int min_interval;
> +
> + int (*init)(void);
> + void (*exit)(void);
> + int (*power_on)(void);
> + int (*power_off)(void);
What do they initialize or power on?
Not a comment just curious.
> +
> +};
> +
> +#endif /* __KERNEL__ */
> +
> +#endif /* __LPS001WP_H__ */
> --
> 1.5.4.3
>
> --
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