mfd: add stmpe-i2c driver
The stmpe mfds can be connected via i2c and spi. This driver provides the basic infrastructure for the i2c kind. It can be added as a normal i2c-device in the board code. To enable functions a platform_data struct has to be provided, that describes what parts of the chip are to be used. Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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054cef284e
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@ -33,4 +33,8 @@ config I2C_TWL6030
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select I2C_TWLCORE
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select I2C_TWLCORE
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bool "TWL6030 driver"
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bool "TWL6030 driver"
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config I2C_STMPE
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depends on I2C
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bool "STMPE-i2c driver"
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endmenu
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endmenu
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@ -6,3 +6,4 @@ obj-$(CONFIG_I2C_LP3972) += lp3972.o
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obj-$(CONFIG_I2C_TWLCORE) += twl-core.o
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obj-$(CONFIG_I2C_TWLCORE) += twl-core.o
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obj-$(CONFIG_I2C_TWL4030) += twl4030.o
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obj-$(CONFIG_I2C_TWL4030) += twl4030.o
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obj-$(CONFIG_I2C_TWL6030) += twl6030.o
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obj-$(CONFIG_I2C_TWL6030) += twl6030.o
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obj-$(CONFIG_I2C_STMPE) += stmpe-i2c.o
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@ -0,0 +1,153 @@
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/*
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* Copyright (C) 2012 Pengutronix
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* Steffen Trumtrar <s.trumtrar@pengutronix.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <init.h>
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#include <driver.h>
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#include <xfuncs.h>
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#include <errno.h>
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#include <i2c/i2c.h>
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#include <mfd/stmpe-i2c.h>
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#define DRIVERNAME "stmpe-i2c"
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#define to_stmpe(a) container_of(a, struct stmpe, cdev)
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int stmpe_reg_read(struct stmpe *stmpe, u32 reg, u8 *val)
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{
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int ret;
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ret = i2c_read_reg(stmpe->client, reg, val, 1);
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return ret == 1 ? 0 : ret;
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}
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EXPORT_SYMBOL(stmpe_reg_read)
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int stmpe_reg_write(struct stmpe *stmpe, u32 reg, u8 val)
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{
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int ret;
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ret = i2c_write_reg(stmpe->client, reg, &val, 1);
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return ret == 1 ? 0 : ret;
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}
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EXPORT_SYMBOL(stmpe_reg_write)
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int stmpe_set_bits(struct stmpe *stmpe, u32 reg, u8 mask, u8 val)
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{
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u8 tmp;
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int err;
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err = stmpe_reg_read(stmpe, reg, &tmp);
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tmp = (tmp & ~mask) | val;
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if (!err)
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err = stmpe_reg_write(stmpe, reg, tmp);
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return err;
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}
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EXPORT_SYMBOL(stmpe_set_bits);
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static ssize_t stmpe_read(struct cdev *cdev, void *_buf, size_t count, loff_t offset, ulong flags)
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{
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struct stmpe *stmpe = to_stmpe(cdev);
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u8 *buf = _buf;
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size_t i = count;
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int err;
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while (i) {
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err = stmpe_reg_read(stmpe, offset, buf);
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if (err)
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return (ssize_t)err;
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buf++;
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i--;
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offset++;
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}
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return count;
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}
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static ssize_t stmpe_write(struct cdev *cdev, const void *_buf, size_t count, loff_t offset, ulong flags)
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{
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struct stmpe *stmpe = to_stmpe(cdev);
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const u8 *buf = _buf;
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size_t i = count;
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int err;
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while (i) {
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err = stmpe_reg_write(stmpe, offset, *buf);
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if (err)
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return (ssize_t)err;
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buf++;
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i--;
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offset++;
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}
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return count;
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}
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static struct file_operations stmpe_fops = {
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.lseek = dev_lseek_default,
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.read = stmpe_read,
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.write = stmpe_write,
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};
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static int stmpe_probe(struct device_d *dev)
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{
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struct stmpe_platform_data *pdata = dev->platform_data;
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struct stmpe *stmpe_dev;
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struct stmpe_client_info *i2c_ci;
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if (!pdata) {
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dev_dbg(dev, "no platform data\n");
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return -ENODEV;
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}
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stmpe_dev = xzalloc(sizeof(struct stmpe));
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stmpe_dev->cdev.name = DRIVERNAME;
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stmpe_dev->client = to_i2c_client(dev);
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stmpe_dev->cdev.size = 191; /* 191 known registers */
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stmpe_dev->cdev.dev = dev;
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stmpe_dev->cdev.ops = &stmpe_fops;
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stmpe_dev->pdata = pdata;
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dev->priv = stmpe_dev;
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i2c_ci = xzalloc(sizeof(struct stmpe_client_info));
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i2c_ci->stmpe = stmpe_dev;
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i2c_ci->read_reg = stmpe_reg_read;
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i2c_ci->write_reg = stmpe_reg_write;
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if (pdata->blocks &= STMPE_BLOCK_GPIO)
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add_generic_device("stmpe-gpio", DEVICE_ID_DYNAMIC, NULL, 0, 0, IORESOURCE_MEM, i2c_ci);
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devfs_create(&stmpe_dev->cdev);
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return 0;
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}
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static struct driver_d stmpe_driver = {
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.name = DRIVERNAME,
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.probe = stmpe_probe,
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};
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static int stmpe_init(void)
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{
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register_driver(&stmpe_driver);
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return 0;
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}
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device_initcall(stmpe_init);
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@ -0,0 +1,53 @@
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/*
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* Copyright (C) 2012 Pengutronix
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* Steffen Trumtrar <s.trumtrar@pengutronix.de>
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*
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* This file is released under the GPLv2
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*
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*/
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#ifndef __ASM_ARCH_STMPE_H
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#define __ASM_ARCH_STMPE_H
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enum stmpe_revision {
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STMPE610,
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STMPE801,
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STMPE811,
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STMPE1601,
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STMPE2401,
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STMPE2403,
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STMPE_NBR_PARTS
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};
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enum stmpe_blocks {
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STMPE_BLOCK_GPIO = 1 << 0,
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STMPE_BLOCK_KEYPAD = 1 << 1,
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STMPE_BLOCK_TOUCHSCREEN = 1 << 2,
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STMPE_BLOCK_ADC = 1 << 3,
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STMPE_BLOCK_PWM = 1 << 4,
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STMPE_BLOCK_ROTATOR = 1 << 5,
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};
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struct stmpe_platform_data {
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enum stmpe_revision revision;
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enum stmpe_blocks blocks;
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int gpio_base;
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};
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struct stmpe {
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struct cdev cdev;
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struct i2c_client *client;
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struct stmpe_platform_data *pdata;
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};
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struct stmpe_client_info {
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struct stmpe *stmpe;
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int (*read_reg)(struct stmpe *stmpe, u32 reg, u8 *val);
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int (*write_reg)(struct stmpe *stmpe, u32 reg, u8 val);
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};
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int stmpe_reg_read(struct stmpe *priv, u32 reg, u8 *val);
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int stmpe_reg_write(struct stmpe *priv, u32 reg, u8 val);
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int stmpe_set_bits(struct stmpe *priv, u32 reg, u8 mask, u8 val);
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#endif /* __ASM_ARCH_STMPE_H */
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