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    Subject[PATCHv3 1/3] mfd: add STMPE I/O Expander support
    Date
    Add support for the STMPE family of I/O Expanders from
    STMicroelectronics. These devices include upto 24 gpios and a varying
    selection of blocks, including PWM, keypad, and touchscreen controllers.
    This patch adds the MFD core.

    [l.fu@pengutronix.de: fix stmpe811 enable hook]
    Acked-by: Linus Walleij <linus.walleij@stericsson.com>
    Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
    ---

    CHANGELOG (for the whole set)

    v2 -> v3:
    - Locking fixes
    - Expanded Kconfig description
    - Moved stmpe-devices.c content into stmpe.c
    - Moved debug ifdefs to header
    - Folded in Luotao Fu's one-liner fix for STMPE811 enable
    - Folded in Luotao Fu's one-liner fix for stmpe-gpio input
    direction

    v1 -> v2
    - Variant data to support other STMPE* variants
    - Enable/disable API
    - GPIO setup/remove callbacks
    - pdata made optional for GPIO
    - Platform specifies which blocks it wants to use
    - IRQ invert polarity option
    - STMPE811 support (needs testing)

    drivers/mfd/Kconfig | 23 ++
    drivers/mfd/Makefile | 1 +
    drivers/mfd/stmpe.c | 915 +++++++++++++++++++++++++++++++++++++++++++++
    drivers/mfd/stmpe.h | 176 +++++++++
    include/linux/mfd/stmpe.h | 154 ++++++++
    5 files changed, 1269 insertions(+), 0 deletions(-)
    create mode 100644 drivers/mfd/stmpe.c
    create mode 100644 drivers/mfd/stmpe.h
    create mode 100644 include/linux/mfd/stmpe.h

    diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
    index 9da0e50..08e4693 100644
    --- a/drivers/mfd/Kconfig
    +++ b/drivers/mfd/Kconfig
    @@ -177,6 +177,29 @@ config TWL4030_CODEC
    select MFD_CORE
    default n

    +config MFD_STMPE
    + bool "Support STMicroelectronics STMPE"
    + depends on I2C=y && GENERIC_HARDIRQS
    + select MFD_CORE
    + help
    + Support for the STMPE family of I/O Expanders from
    + STMicroelectronics.
    +
    + Currently supported devices are:
    +
    + STMPE811: GPIO, Touchscreen
    + STMPE1601: GPIO, Keypad
    + STMPE2401: GPIO, Keypad
    + STMPE2403: GPIO, Keypad
    +
    + This driver provides common support for accessing the device,
    + additional drivers must be enabled in order to use the functionality
    + of the device. Currently available sub drivers are:
    +
    + GPIO: stmpe-gpio
    + Keypad: stmpe-keypad
    + Touchscreen: stmpe-ts
    +
    config MFD_TC35892
    bool "Support Toshiba TC35892"
    depends on I2C=y && GENERIC_HARDIRQS
    diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
    index fb503e7..4410747 100644
    --- a/drivers/mfd/Makefile
    +++ b/drivers/mfd/Makefile
    @@ -15,6 +15,7 @@ obj-$(CONFIG_HTC_I2CPLD) += htc-i2cpld.o
    obj-$(CONFIG_MFD_DAVINCI_VOICECODEC) += davinci_voicecodec.o
    obj-$(CONFIG_MFD_DM355EVM_MSP) += dm355evm_msp.o

    +obj-$(CONFIG_MFD_STMPE) += stmpe.o
    obj-$(CONFIG_MFD_TC35892) += tc35892.o
    obj-$(CONFIG_MFD_T7L66XB) += t7l66xb.o tmio_core.o
    obj-$(CONFIG_MFD_TC6387XB) += tc6387xb.o tmio_core.o
    diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
    new file mode 100644
    index 0000000..a7f3099
    --- /dev/null
    +++ b/drivers/mfd/stmpe.c
    @@ -0,0 +1,915 @@
    +/*
    + * Copyright (C) ST-Ericsson SA 2010
    + *
    + * License Terms: GNU General Public License, version 2
    + * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
    + */
    +
    +#include <linux/kernel.h>
    +#include <linux/module.h>
    +#include <linux/interrupt.h>
    +#include <linux/irq.h>
    +#include <linux/slab.h>
    +#include <linux/i2c.h>
    +#include <linux/mfd/core.h>
    +#include <linux/mfd/stmpe.h>
    +#include "stmpe.h"
    +
    +static int __stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
    +{
    + return stmpe->variant->enable(stmpe, blocks, true);
    +}
    +
    +static int __stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
    +{
    + return stmpe->variant->enable(stmpe, blocks, false);
    +}
    +
    +static int __stmpe_reg_read(struct stmpe *stmpe, u8 reg)
    +{
    + int ret;
    +
    + ret = i2c_smbus_read_byte_data(stmpe->i2c, reg);
    + if (ret < 0)
    + dev_err(stmpe->dev, "failed to read reg %#x: %d\n",
    + reg, ret);
    +
    + dev_vdbg(stmpe->dev, "rd: reg %#x => data %#x\n", reg, ret);
    +
    + return ret;
    +}
    +
    +static int __stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
    +{
    + int ret;
    +
    + dev_vdbg(stmpe->dev, "wr: reg %#x <= %#x\n", reg, val);
    +
    + ret = i2c_smbus_write_byte_data(stmpe->i2c, reg, val);
    + if (ret < 0)
    + dev_err(stmpe->dev, "failed to write reg %#x: %d\n",
    + reg, ret);
    +
    + return ret;
    +}
    +
    +static int __stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
    +{
    + int ret;
    +
    + ret = __stmpe_reg_read(stmpe, reg);
    + if (ret < 0)
    + return ret;
    +
    + ret &= ~mask;
    + ret |= val;
    +
    + return __stmpe_reg_write(stmpe, reg, ret);
    +}
    +
    +static int __stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length,
    + u8 *values)
    +{
    + int ret;
    +
    + ret = i2c_smbus_read_i2c_block_data(stmpe->i2c, reg, length, values);
    + if (ret < 0)
    + dev_err(stmpe->dev, "failed to read regs %#x: %d\n",
    + reg, ret);
    +
    + dev_vdbg(stmpe->dev, "rd: reg %#x (%d) => ret %#x\n", reg, length, ret);
    + stmpe_dump_bytes("stmpe rd: ", values, length);
    +
    + return ret;
    +}
    +
    +static int __stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
    + const u8 *values)
    +{
    + int ret;
    +
    + dev_vdbg(stmpe->dev, "wr: regs %#x (%d)\n", reg, length);
    + stmpe_dump_bytes("stmpe wr: ", values, length);
    +
    + ret = i2c_smbus_write_i2c_block_data(stmpe->i2c, reg, length,
    + values);
    + if (ret < 0)
    + dev_err(stmpe->dev, "failed to write regs %#x: %d\n",
    + reg, ret);
    +
    + return ret;
    +}
    +
    +/**
    + * stmpe_enable - enable blocks on an STMPE device
    + * @stmpe: Device to work on
    + * @blocks: Mask of blocks (enum stmpe_block values) to enable
    + */
    +int stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
    +{
    + int ret;
    +
    + mutex_lock(&stmpe->lock);
    + ret = __stmpe_enable(stmpe, blocks);
    + mutex_unlock(&stmpe->lock);
    +
    + return ret;
    +}
    +EXPORT_SYMBOL_GPL(stmpe_enable);
    +
    +/**
    + * stmpe_disable - disable blocks on an STMPE device
    + * @stmpe: Device to work on
    + * @blocks: Mask of blocks (enum stmpe_block values) to enable
    + */
    +int stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
    +{
    + int ret;
    +
    + mutex_lock(&stmpe->lock);
    + ret = __stmpe_disable(stmpe, blocks);
    + mutex_unlock(&stmpe->lock);
    +
    + return ret;
    +}
    +EXPORT_SYMBOL_GPL(stmpe_disable);
    +
    +/**
    + * stmpe_reg_read() - read a single STMPE register
    + * @stmpe: Device to read from
    + * @reg: Register to read
    + */
    +int stmpe_reg_read(struct stmpe *stmpe, u8 reg)
    +{
    + int ret;
    +
    + mutex_lock(&stmpe->lock);
    + ret = __stmpe_reg_read(stmpe, reg);
    + mutex_unlock(&stmpe->lock);
    +
    + return ret;
    +}
    +EXPORT_SYMBOL_GPL(stmpe_reg_read);
    +
    +/**
    + * stmpe_reg_write() - write a single STMPE register
    + * @stmpe: Device to write to
    + * @reg: Register to write
    + * @val: Value to write
    + */
    +int stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
    +{
    + int ret;
    +
    + mutex_lock(&stmpe->lock);
    + ret = __stmpe_reg_write(stmpe, reg, val);
    + mutex_unlock(&stmpe->lock);
    +
    + return ret;
    +}
    +EXPORT_SYMBOL_GPL(stmpe_reg_write);
    +
    +/**
    + * stmpe_set_bits() - set the value of a bitfield in a STMPE register
    + * @stmpe: Device to write to
    + * @reg: Register to write
    + * @mask: Mask of bits to set
    + * @val: Value to set
    + */
    +int stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
    +{
    + int ret;
    +
    + mutex_lock(&stmpe->lock);
    + ret = __stmpe_set_bits(stmpe, reg, mask, val);
    + mutex_unlock(&stmpe->lock);
    +
    + return ret;
    +}
    +EXPORT_SYMBOL_GPL(stmpe_set_bits);
    +
    +/**
    + * stmpe_block_read() - read multiple STMPE registers
    + * @stmpe: Device to read from
    + * @reg: First register
    + * @length: Number of registers
    + * @values: Buffer to write to
    + */
    +int stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values)
    +{
    + int ret;
    +
    + mutex_lock(&stmpe->lock);
    + ret = __stmpe_block_read(stmpe, reg, length, values);
    + mutex_unlock(&stmpe->lock);
    +
    + return ret;
    +}
    +EXPORT_SYMBOL_GPL(stmpe_block_read);
    +
    +/**
    + * stmpe_block_write() - write multiple STMPE registers
    + * @stmpe: Device to write to
    + * @reg: First register
    + * @length: Number of registers
    + * @values: Values to write
    + */
    +int stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
    + const u8 *values)
    +{
    + int ret;
    +
    + mutex_lock(&stmpe->lock);
    + ret = __stmpe_block_write(stmpe, reg, length, values);
    + mutex_unlock(&stmpe->lock);
    +
    + return ret;
    +}
    +EXPORT_SYMBOL_GPL(stmpe_block_write);
    +
    +/**
    + * stmpe_set_altfunc: set the alternate function for STMPE pins
    + * @stmpe: Device to configure
    + * @pins: Bitmask of pins to affect
    + * @block: block to enable alternate functions for
    + *
    + * @pins is assumed to have a bit set for each of the bits whose alternate
    + * function is to be changed, numbered according to the GPIOXY numbers.
    + *
    + * If the GPIO module is not enabled, this function automatically enables it in
    + * order to perform the change.
    + */
    +int stmpe_set_altfunc(struct stmpe *stmpe, u32 pins, enum stmpe_block block)
    +{
    + struct stmpe_variant_info *variant = stmpe->variant;
    + u8 regaddr = stmpe->regs[STMPE_IDX_GPAFR_U_MSB];
    + int af_bits = variant->af_bits;
    + int numregs = DIV_ROUND_UP(stmpe->num_gpios * af_bits, 8);
    + int afperreg = 8 / af_bits;
    + int mask = (1 << af_bits) - 1;
    + u8 regs[numregs];
    + int af;
    + int ret;
    +
    + mutex_lock(&stmpe->lock);
    +
    + ret = __stmpe_enable(stmpe, STMPE_BLOCK_GPIO);
    + if (ret < 0)
    + goto out;
    +
    + ret = __stmpe_block_read(stmpe, regaddr, numregs, regs);
    + if (ret < 0)
    + goto out;
    +
    + af = variant->get_altfunc(stmpe, block);
    +
    + while (pins) {
    + int pin = __ffs(pins);
    + int regoffset = numregs - (pin / afperreg) - 1;
    + int pos = (pin % afperreg) * (8 / afperreg);
    +
    + regs[regoffset] &= ~(mask << pos);
    + regs[regoffset] |= af << pos;
    +
    + pins &= ~(1 << pin);
    + }
    +
    + ret = __stmpe_block_write(stmpe, regaddr, numregs, regs);
    +
    +out:
    + mutex_unlock(&stmpe->lock);
    + return ret;
    +}
    +EXPORT_SYMBOL_GPL(stmpe_set_altfunc);
    +
    +/*
    + * GPIO (all variants)
    + */
    +
    +static struct resource stmpe_gpio_resources[] = {
    + /* Start and end filled dynamically */
    + {
    + .flags = IORESOURCE_IRQ,
    + },
    +};
    +
    +static struct mfd_cell stmpe_gpio_cell = {
    + .name = "stmpe-gpio",
    + .resources = stmpe_gpio_resources,
    + .num_resources = ARRAY_SIZE(stmpe_gpio_resources),
    +};
    +
    +/*
    + * Keypad (1601, 2401, 2403)
    + */
    +
    +static struct resource stmpe_keypad_resources[] = {
    + {
    + .name = "KEYPAD",
    + .start = 0,
    + .end = 0,
    + .flags = IORESOURCE_IRQ,
    + },
    + {
    + .name = "KEYPAD_OVER",
    + .start = 1,
    + .end = 1,
    + .flags = IORESOURCE_IRQ,
    + },
    +};
    +
    +static struct mfd_cell stmpe_keypad_cell = {
    + .name = "stmpe-keypad",
    + .resources = stmpe_keypad_resources,
    + .num_resources = ARRAY_SIZE(stmpe_keypad_resources),
    +};
    +
    +/*
    + * Touchscreen (STMPE811)
    + */
    +
    +static struct resource stmpe_ts_resources[] = {
    + {
    + .name = "TOUCH_DET",
    + .start = 0,
    + .end = 0,
    + .flags = IORESOURCE_IRQ,
    + },
    + {
    + .name = "FIFO_TH",
    + .start = 1,
    + .end = 1,
    + .flags = IORESOURCE_IRQ,
    + },
    +};
    +
    +static struct mfd_cell stmpe_ts_cell = {
    + .name = "stmpe-ts",
    + .resources = stmpe_ts_resources,
    + .num_resources = ARRAY_SIZE(stmpe_ts_resources),
    +};
    +
    +/*
    + * STMPE811
    + */
    +
    +static const u8 stmpe811_regs[] = {
    + [STMPE_IDX_CHIP_ID] = STMPE811_REG_CHIP_ID,
    + [STMPE_IDX_ICR_LSB] = STMPE811_REG_INT_CTRL,
    + [STMPE_IDX_IER_LSB] = STMPE811_REG_INT_EN,
    + [STMPE_IDX_ISR_MSB] = STMPE811_REG_INT_STA,
    + [STMPE_IDX_GPMR_LSB] = STMPE811_REG_GPIO_MP_STA,
    + [STMPE_IDX_GPSR_LSB] = STMPE811_REG_GPIO_SET_PIN,
    + [STMPE_IDX_GPCR_LSB] = STMPE811_REG_GPIO_CLR_PIN,
    + [STMPE_IDX_GPDR_LSB] = STMPE811_REG_GPIO_DIR,
    + [STMPE_IDX_GPRER_LSB] = STMPE811_REG_GPIO_RE,
    + [STMPE_IDX_GPFER_LSB] = STMPE811_REG_GPIO_FE,
    + [STMPE_IDX_GPAFR_U_MSB] = STMPE811_REG_GPIO_AF,
    + [STMPE_IDX_IEGPIOR_LSB] = STMPE811_REG_GPIO_INT_EN,
    + [STMPE_IDX_ISGPIOR_MSB] = STMPE811_REG_GPIO_INT_STA,
    + [STMPE_IDX_GPEDR_MSB] = STMPE811_REG_GPIO_ED,
    +};
    +
    +static struct stmpe_variant_block stmpe811_blocks[] = {
    + {
    + .cell = &stmpe_gpio_cell,
    + .irq = STMPE811_IRQ_GPIOC,
    + .block = STMPE_BLOCK_GPIO,
    + },
    + {
    + .cell = &stmpe_ts_cell,
    + .irq = STMPE811_IRQ_TOUCH_DET,
    + .block = STMPE_BLOCK_TOUCHSCREEN,
    + },
    +};
    +
    +static int stmpe811_enable(struct stmpe *stmpe, unsigned int blocks,
    + bool enable)
    +{
    + unsigned int mask = 0;
    +
    + if (blocks & STMPE_BLOCK_GPIO)
    + mask |= STMPE811_SYS_CTRL2_GPIO_OFF;
    +
    + if (blocks & STMPE_BLOCK_ADC)
    + mask |= STMPE811_SYS_CTRL2_ADC_OFF;
    +
    + if (blocks & STMPE_BLOCK_TOUCHSCREEN)
    + mask |= STMPE811_SYS_CTRL2_TSC_OFF;
    +
    + return __stmpe_set_bits(stmpe, STMPE811_REG_SYS_CTRL2, mask,
    + enable ? 0 : mask);
    +}
    +
    +static int stmpe811_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
    +{
    + /* 0 for touchscreen, 1 for GPIO */
    + return block != STMPE_BLOCK_TOUCHSCREEN;
    +}
    +
    +static struct stmpe_variant_info stmpe811 = {
    + .name = "stmpe811",
    + .id_val = 0x0811,
    + .id_mask = 0xffff,
    + .num_gpios = 8,
    + .af_bits = 1,
    + .regs = stmpe811_regs,
    + .blocks = stmpe811_blocks,
    + .num_blocks = ARRAY_SIZE(stmpe811_blocks),
    + .num_irqs = STMPE811_NR_INTERNAL_IRQS,
    + .enable = stmpe811_enable,
    + .get_altfunc = stmpe811_get_altfunc,
    +};
    +
    +/*
    + * STMPE1601
    + */
    +
    +static const u8 stmpe1601_regs[] = {
    + [STMPE_IDX_CHIP_ID] = STMPE1601_REG_CHIP_ID,
    + [STMPE_IDX_ICR_LSB] = STMPE1601_REG_ICR_LSB,
    + [STMPE_IDX_IER_LSB] = STMPE1601_REG_IER_LSB,
    + [STMPE_IDX_ISR_MSB] = STMPE1601_REG_ISR_MSB,
    + [STMPE_IDX_GPMR_LSB] = STMPE1601_REG_GPIO_MP_LSB,
    + [STMPE_IDX_GPSR_LSB] = STMPE1601_REG_GPIO_SET_LSB,
    + [STMPE_IDX_GPCR_LSB] = STMPE1601_REG_GPIO_CLR_LSB,
    + [STMPE_IDX_GPDR_LSB] = STMPE1601_REG_GPIO_SET_DIR_LSB,
    + [STMPE_IDX_GPRER_LSB] = STMPE1601_REG_GPIO_RE_LSB,
    + [STMPE_IDX_GPFER_LSB] = STMPE1601_REG_GPIO_FE_LSB,
    + [STMPE_IDX_GPAFR_U_MSB] = STMPE1601_REG_GPIO_AF_U_MSB,
    + [STMPE_IDX_IEGPIOR_LSB] = STMPE1601_REG_INT_EN_GPIO_MASK_LSB,
    + [STMPE_IDX_ISGPIOR_MSB] = STMPE1601_REG_INT_STA_GPIO_MSB,
    + [STMPE_IDX_GPEDR_MSB] = STMPE1601_REG_GPIO_ED_MSB,
    +};
    +
    +static struct stmpe_variant_block stmpe1601_blocks[] = {
    + {
    + .cell = &stmpe_gpio_cell,
    + .irq = STMPE24XX_IRQ_GPIOC,
    + .block = STMPE_BLOCK_GPIO,
    + },
    + {
    + .cell = &stmpe_keypad_cell,
    + .irq = STMPE24XX_IRQ_KEYPAD,
    + .block = STMPE_BLOCK_KEYPAD,
    + },
    +};
    +
    +static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks,
    + bool enable)
    +{
    + unsigned int mask = 0;
    +
    + if (blocks & STMPE_BLOCK_GPIO)
    + mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO;
    +
    + if (blocks & STMPE_BLOCK_KEYPAD)
    + mask |= STMPE1601_SYS_CTRL_ENABLE_KPC;
    +
    + return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask,
    + enable ? mask : 0);
    +}
    +
    +static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
    +{
    + switch (block) {
    + case STMPE_BLOCK_PWM:
    + return 2;
    +
    + case STMPE_BLOCK_KEYPAD:
    + return 1;
    +
    + case STMPE_BLOCK_GPIO:
    + default:
    + return 0;
    + }
    +}
    +
    +static struct stmpe_variant_info stmpe1601 = {
    + .name = "stmpe1601",
    + .id_val = 0x0210,
    + .id_mask = 0xfff0, /* at least 0x0210 and 0x0212 */
    + .num_gpios = 16,
    + .af_bits = 2,
    + .regs = stmpe1601_regs,
    + .blocks = stmpe1601_blocks,
    + .num_blocks = ARRAY_SIZE(stmpe1601_blocks),
    + .num_irqs = STMPE1601_NR_INTERNAL_IRQS,
    + .enable = stmpe1601_enable,
    + .get_altfunc = stmpe1601_get_altfunc,
    +};
    +
    +/*
    + * STMPE24XX
    + */
    +
    +static const u8 stmpe24xx_regs[] = {
    + [STMPE_IDX_CHIP_ID] = STMPE24XX_REG_CHIP_ID,
    + [STMPE_IDX_ICR_LSB] = STMPE24XX_REG_ICR_LSB,
    + [STMPE_IDX_IER_LSB] = STMPE24XX_REG_IER_LSB,
    + [STMPE_IDX_ISR_MSB] = STMPE24XX_REG_ISR_MSB,
    + [STMPE_IDX_GPMR_LSB] = STMPE24XX_REG_GPMR_LSB,
    + [STMPE_IDX_GPSR_LSB] = STMPE24XX_REG_GPSR_LSB,
    + [STMPE_IDX_GPCR_LSB] = STMPE24XX_REG_GPCR_LSB,
    + [STMPE_IDX_GPDR_LSB] = STMPE24XX_REG_GPDR_LSB,
    + [STMPE_IDX_GPRER_LSB] = STMPE24XX_REG_GPRER_LSB,
    + [STMPE_IDX_GPFER_LSB] = STMPE24XX_REG_GPFER_LSB,
    + [STMPE_IDX_GPAFR_U_MSB] = STMPE24XX_REG_GPAFR_U_MSB,
    + [STMPE_IDX_IEGPIOR_LSB] = STMPE24XX_REG_IEGPIOR_LSB,
    + [STMPE_IDX_ISGPIOR_MSB] = STMPE24XX_REG_ISGPIOR_MSB,
    + [STMPE_IDX_GPEDR_MSB] = STMPE24XX_REG_GPEDR_MSB,
    +};
    +
    +static struct stmpe_variant_block stmpe24xx_blocks[] = {
    + {
    + .cell = &stmpe_gpio_cell,
    + .irq = STMPE24XX_IRQ_GPIOC,
    + .block = STMPE_BLOCK_GPIO,
    + },
    + {
    + .cell = &stmpe_keypad_cell,
    + .irq = STMPE24XX_IRQ_KEYPAD,
    + .block = STMPE_BLOCK_KEYPAD,
    + },
    +};
    +
    +static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks,
    + bool enable)
    +{
    + unsigned int mask = 0;
    +
    + if (blocks & STMPE_BLOCK_GPIO)
    + mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO;
    +
    + if (blocks & STMPE_BLOCK_KEYPAD)
    + mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC;
    +
    + return __stmpe_set_bits(stmpe, STMPE24XX_REG_SYS_CTRL, mask,
    + enable ? mask : 0);
    +}
    +
    +static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
    +{
    + switch (block) {
    + case STMPE_BLOCK_ROTATOR:
    + return 2;
    +
    + case STMPE_BLOCK_KEYPAD:
    + return 1;
    +
    + case STMPE_BLOCK_GPIO:
    + default:
    + return 0;
    + }
    +}
    +
    +static struct stmpe_variant_info stmpe2401 = {
    + .name = "stmpe2401",
    + .id_val = 0x0101,
    + .id_mask = 0xffff,
    + .num_gpios = 24,
    + .af_bits = 2,
    + .regs = stmpe24xx_regs,
    + .blocks = stmpe24xx_blocks,
    + .num_blocks = ARRAY_SIZE(stmpe24xx_blocks),
    + .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
    + .enable = stmpe24xx_enable,
    + .get_altfunc = stmpe24xx_get_altfunc,
    +};
    +
    +static struct stmpe_variant_info stmpe2403 = {
    + .name = "stmpe2403",
    + .id_val = 0x0120,
    + .id_mask = 0xffff,
    + .num_gpios = 24,
    + .af_bits = 2,
    + .regs = stmpe24xx_regs,
    + .blocks = stmpe24xx_blocks,
    + .num_blocks = ARRAY_SIZE(stmpe24xx_blocks),
    + .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
    + .enable = stmpe24xx_enable,
    + .get_altfunc = stmpe24xx_get_altfunc,
    +};
    +
    +static struct stmpe_variant_info *stmpe_variant_info[] = {
    + [STMPE811] = &stmpe811,
    + [STMPE1601] = &stmpe1601,
    + [STMPE2401] = &stmpe2401,
    + [STMPE2403] = &stmpe2403,
    +};
    +
    +static irqreturn_t stmpe_irq(int irq, void *data)
    +{
    + struct stmpe *stmpe = data;
    + struct stmpe_variant_info *variant = stmpe->variant;
    + int num = DIV_ROUND_UP(variant->num_irqs, 8);
    + u8 israddr = stmpe->regs[STMPE_IDX_ISR_MSB];
    + u8 isr[num];
    + int ret;
    + int i;
    +
    + ret = stmpe_block_read(stmpe, israddr, num, isr);
    + if (ret < 0)
    + return IRQ_NONE;
    +
    + for (i = 0; i < num; i++) {
    + int bank = num - i - 1;
    + u8 status = isr[i];
    + u8 clear;
    +
    + status &= stmpe->ier[bank];
    + if (!status)
    + continue;
    +
    + clear = status;
    + while (status) {
    + int bit = __ffs(status);
    + int line = bank * 8 + bit;
    +
    + handle_nested_irq(stmpe->irq_base + line);
    + status &= ~(1 << bit);
    + }
    +
    + stmpe_reg_write(stmpe, israddr + i, clear);
    + }
    +
    + return IRQ_HANDLED;
    +}
    +
    +static void stmpe_irq_lock(unsigned int irq)
    +{
    + struct stmpe *stmpe = get_irq_chip_data(irq);
    +
    + mutex_lock(&stmpe->irq_lock);
    +}
    +
    +static void stmpe_irq_sync_unlock(unsigned int irq)
    +{
    + struct stmpe *stmpe = get_irq_chip_data(irq);
    + struct stmpe_variant_info *variant = stmpe->variant;
    + int num = DIV_ROUND_UP(variant->num_irqs, 8);
    + int i;
    +
    + for (i = 0; i < num; i++) {
    + u8 new = stmpe->ier[i];
    + u8 old = stmpe->oldier[i];
    +
    + if (new == old)
    + continue;
    +
    + stmpe->oldier[i] = new;
    + stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new);
    + }
    +
    + mutex_unlock(&stmpe->irq_lock);
    +}
    +
    +static void stmpe_irq_mask(unsigned int irq)
    +{
    + struct stmpe *stmpe = get_irq_chip_data(irq);
    + int offset = irq - stmpe->irq_base;
    + int regoffset = offset / 8;
    + int mask = 1 << (offset % 8);
    +
    + stmpe->ier[regoffset] &= ~mask;
    +}
    +
    +static void stmpe_irq_unmask(unsigned int irq)
    +{
    + struct stmpe *stmpe = get_irq_chip_data(irq);
    + int offset = irq - stmpe->irq_base;
    + int regoffset = offset / 8;
    + int mask = 1 << (offset % 8);
    +
    + stmpe->ier[regoffset] |= mask;
    +}
    +
    +static struct irq_chip stmpe_irq_chip = {
    + .name = "stmpe",
    + .bus_lock = stmpe_irq_lock,
    + .bus_sync_unlock = stmpe_irq_sync_unlock,
    + .mask = stmpe_irq_mask,
    + .unmask = stmpe_irq_unmask,
    +};
    +
    +static int __devinit stmpe_irq_init(struct stmpe *stmpe)
    +{
    + int num_irqs = stmpe->variant->num_irqs;
    + int base = stmpe->irq_base;
    + int irq;
    +
    + for (irq = base; irq < base + num_irqs; irq++) {
    + set_irq_chip_data(irq, stmpe);
    + set_irq_chip_and_handler(irq, &stmpe_irq_chip,
    + handle_edge_irq);
    + set_irq_nested_thread(irq, 1);
    +#ifdef CONFIG_ARM
    + set_irq_flags(irq, IRQF_VALID);
    +#else
    + set_irq_noprobe(irq);
    +#endif
    + }
    +
    + return 0;
    +}
    +
    +static void stmpe_irq_remove(struct stmpe *stmpe)
    +{
    + int num_irqs = stmpe->variant->num_irqs;
    + int base = stmpe->irq_base;
    + int irq;
    +
    + for (irq = base; irq < base + num_irqs; irq++) {
    +#ifdef CONFIG_ARM
    + set_irq_flags(irq, 0);
    +#endif
    + set_irq_chip_and_handler(irq, NULL, NULL);
    + set_irq_chip_data(irq, NULL);
    + }
    +}
    +
    +static int __devinit stmpe_chip_init(struct stmpe *stmpe)
    +{
    + unsigned int irq_trigger = stmpe->pdata->irq_trigger;
    + struct stmpe_variant_info *variant = stmpe->variant;
    + u8 icr = STMPE_ICR_LSB_GIM;
    + unsigned int id;
    + u8 data[2];
    + int ret;
    +
    + ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID],
    + ARRAY_SIZE(data), data);
    + if (ret < 0)
    + return ret;
    +
    + id = (data[0] << 8) | data[1];
    + if ((id & variant->id_mask) != variant->id_val) {
    + dev_err(stmpe->dev, "unknown chip id: %#x\n", id);
    + return -EINVAL;
    + }
    +
    + dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id);
    +
    + /* Disable all modules -- subdrivers should enable what they need. */
    + ret = stmpe_disable(stmpe, ~0);
    + if (ret)
    + return ret;
    +
    + if (irq_trigger == IRQF_TRIGGER_FALLING ||
    + irq_trigger == IRQF_TRIGGER_RISING)
    + icr |= STMPE_ICR_LSB_EDGE;
    +
    + if (irq_trigger == IRQF_TRIGGER_RISING ||
    + irq_trigger == IRQF_TRIGGER_HIGH)
    + icr |= STMPE_ICR_LSB_HIGH;
    +
    + if (stmpe->pdata->irq_invert_polarity)
    + icr ^= STMPE_ICR_LSB_HIGH;
    +
    + return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr);
    +}
    +
    +static int __devinit stmpe_add_device(struct stmpe *stmpe,
    + struct mfd_cell *cell, int irq)
    +{
    + return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1,
    + NULL, stmpe->irq_base + irq);
    +}
    +
    +static int __devinit stmpe_devices_init(struct stmpe *stmpe)
    +{
    + struct stmpe_variant_info *variant = stmpe->variant;
    + unsigned int platform_blocks = stmpe->pdata->blocks;
    + int ret = -EINVAL;
    + int i;
    +
    + for (i = 0; i < variant->num_blocks; i++) {
    + struct stmpe_variant_block *block = &variant->blocks[i];
    +
    + if (!(platform_blocks & block->block))
    + continue;
    +
    + platform_blocks &= ~block->block;
    + ret = stmpe_add_device(stmpe, block->cell, block->irq);
    + if (ret)
    + return ret;
    + }
    +
    + if (platform_blocks)
    + dev_warn(stmpe->dev,
    + "platform wants blocks (%#x) not present on variant",
    + platform_blocks);
    +
    + return ret;
    +}
    +
    +static int __devinit stmpe_probe(struct i2c_client *i2c,
    + const struct i2c_device_id *id)
    +{
    + struct stmpe_platform_data *pdata = i2c->dev.platform_data;
    + struct stmpe *stmpe;
    + int ret;
    +
    + if (!pdata)
    + return -EINVAL;
    +
    + stmpe = kzalloc(sizeof(struct stmpe), GFP_KERNEL);
    + if (!stmpe)
    + return -ENOMEM;
    +
    + mutex_init(&stmpe->irq_lock);
    + mutex_init(&stmpe->lock);
    +
    + stmpe->dev = &i2c->dev;
    + stmpe->i2c = i2c;
    +
    + stmpe->pdata = pdata;
    + stmpe->irq_base = pdata->irq_base;
    +
    + stmpe->partnum = id->driver_data;
    + stmpe->variant = stmpe_variant_info[stmpe->partnum];
    + stmpe->regs = stmpe->variant->regs;
    + stmpe->num_gpios = stmpe->variant->num_gpios;
    +
    + i2c_set_clientdata(i2c, stmpe);
    +
    + ret = stmpe_chip_init(stmpe);
    + if (ret)
    + goto out_free;
    +
    + ret = stmpe_irq_init(stmpe);
    + if (ret)
    + goto out_free;
    +
    + ret = request_threaded_irq(stmpe->i2c->irq, NULL, stmpe_irq,
    + pdata->irq_trigger | IRQF_ONESHOT,
    + "stmpe", stmpe);
    + if (ret) {
    + dev_err(stmpe->dev, "failed to request IRQ: %d\n", ret);
    + goto out_removeirq;
    + }
    +
    + ret = stmpe_devices_init(stmpe);
    + if (ret) {
    + dev_err(stmpe->dev, "failed to add children\n");
    + goto out_removedevs;
    + }
    +
    + return 0;
    +
    +out_removedevs:
    + mfd_remove_devices(stmpe->dev);
    + free_irq(stmpe->i2c->irq, stmpe);
    +out_removeirq:
    + stmpe_irq_remove(stmpe);
    +out_free:
    + kfree(stmpe);
    + return ret;
    +}
    +
    +static int __devexit stmpe_remove(struct i2c_client *client)
    +{
    + struct stmpe *stmpe = i2c_get_clientdata(client);
    +
    + mfd_remove_devices(stmpe->dev);
    +
    + free_irq(stmpe->i2c->irq, stmpe);
    + stmpe_irq_remove(stmpe);
    +
    + kfree(stmpe);
    +
    + return 0;
    +}
    +
    +static const struct i2c_device_id stmpe_id[] = {
    + { "stmpe811", STMPE811 },
    + { "stmpe1601", STMPE1601 },
    + { "stmpe2401", STMPE2401 },
    + { "stmpe2403", STMPE2403 },
    + { }
    +};
    +MODULE_DEVICE_TABLE(i2c, stmpe_id);
    +
    +static struct i2c_driver stmpe_driver = {
    + .driver.name = "stmpe",
    + .driver.owner = THIS_MODULE,
    + .probe = stmpe_probe,
    + .remove = __devexit_p(stmpe_remove),
    + .id_table = stmpe_id,
    +};
    +
    +static int __init stmpe_init(void)
    +{
    + return i2c_add_driver(&stmpe_driver);
    +}
    +subsys_initcall(stmpe_init);
    +
    +static void __exit stmpe_exit(void)
    +{
    + i2c_del_driver(&stmpe_driver);
    +}
    +module_exit(stmpe_exit);
    +
    +MODULE_LICENSE("GPL v2");
    +MODULE_DESCRIPTION("STMPE MFD core driver");
    +MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");
    diff --git a/drivers/mfd/stmpe.h b/drivers/mfd/stmpe.h
    new file mode 100644
    index 0000000..991f0ec
    --- /dev/null
    +++ b/drivers/mfd/stmpe.h
    @@ -0,0 +1,176 @@
    +/*
    + * Copyright (C) ST-Ericsson SA 2010
    + *
    + * License Terms: GNU General Public License, version 2
    + * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
    + */
    +
    +#ifndef __STMPE_H
    +#define __STMPE_H
    +
    +#ifdef STMPE_DUMP_BYTES
    +static inline void stmpe_dump_bytes(const char *str, const void *buf,
    + size_t len)
    +{
    + print_hex_dump_bytes(str, DUMP_PREFIX_OFFSET, buf, len);
    +}
    +#else
    +static inline void stmpe_dump_bytes(const char *str, const void *buf,
    + size_t len)
    +{
    +}
    +#endif
    +
    +/**
    + * struct stmpe_variant_block - information about block
    + * @cell: base mfd cell
    + * @irq: interrupt number to be added to each IORESOURCE_IRQ
    + * in the cell
    + * @block: block id; used for identification with platform data and for
    + * enable and altfunc callbacks
    + */
    +struct stmpe_variant_block {
    + struct mfd_cell *cell;
    + int irq;
    + enum stmpe_block block;
    +};
    +
    +/**
    + * struct stmpe_variant_info - variant-specific information
    + * @name: part name
    + * @id_val: content of CHIPID register
    + * @id_mask: bits valid in CHIPID register for comparison with id_val
    + * @num_gpios: number of GPIOS
    + * @af_bits: number of bits used to specify the alternate function
    + * @blocks: list of blocks present on this device
    + * @num_blocks: number of blocks present on this device
    + * @num_irqs: number of internal IRQs available on this device
    + * @enable: callback to enable the specified blocks.
    + * Called with the I/O lock held.
    + * @get_altfunc: callback to get the alternate function number for the
    + * specific block
    + */
    +struct stmpe_variant_info {
    + const char *name;
    + u16 id_val;
    + u16 id_mask;
    + int num_gpios;
    + int af_bits;
    + const u8 *regs;
    + struct stmpe_variant_block *blocks;
    + int num_blocks;
    + int num_irqs;
    + int (*enable)(struct stmpe *stmpe, unsigned int blocks, bool enable);
    + int (*get_altfunc)(struct stmpe *stmpe, enum stmpe_block block);
    +};
    +
    +#define STMPE_ICR_LSB_HIGH (1 << 2)
    +#define STMPE_ICR_LSB_EDGE (1 << 1)
    +#define STMPE_ICR_LSB_GIM (1 << 0)
    +
    +/*
    + * STMPE811
    + */
    +
    +#define STMPE811_IRQ_TOUCH_DET 0
    +#define STMPE811_IRQ_FIFO_TH 1
    +#define STMPE811_IRQ_FIFO_OFLOW 2
    +#define STMPE811_IRQ_FIFO_FULL 3
    +#define STMPE811_IRQ_FIFO_EMPTY 4
    +#define STMPE811_IRQ_TEMP_SENS 5
    +#define STMPE811_IRQ_ADC 6
    +#define STMPE811_IRQ_GPIOC 7
    +#define STMPE811_NR_INTERNAL_IRQS 8
    +
    +#define STMPE811_REG_CHIP_ID 0x00
    +#define STMPE811_REG_SYS_CTRL2 0x04
    +#define STMPE811_REG_INT_CTRL 0x09
    +#define STMPE811_REG_INT_EN 0x0A
    +#define STMPE811_REG_INT_STA 0x0B
    +#define STMPE811_REG_GPIO_INT_EN 0x0C
    +#define STMPE811_REG_GPIO_INT_STA 0x0D
    +#define STMPE811_REG_GPIO_SET_PIN 0x10
    +#define STMPE811_REG_GPIO_CLR_PIN 0x11
    +#define STMPE811_REG_GPIO_MP_STA 0x12
    +#define STMPE811_REG_GPIO_DIR 0x13
    +#define STMPE811_REG_GPIO_ED 0x14
    +#define STMPE811_REG_GPIO_RE 0x15
    +#define STMPE811_REG_GPIO_FE 0x16
    +#define STMPE811_REG_GPIO_AF 0x17
    +
    +#define STMPE811_SYS_CTRL2_ADC_OFF (1 << 0)
    +#define STMPE811_SYS_CTRL2_TSC_OFF (1 << 1)
    +#define STMPE811_SYS_CTRL2_GPIO_OFF (1 << 2)
    +#define STMPE811_SYS_CTRL2_TS_OFF (1 << 3)
    +
    +/*
    + * STMPE1601
    + */
    +
    +#define STMPE1601_IRQ_GPIOC 8
    +#define STMPE1601_IRQ_PWM3 7
    +#define STMPE1601_IRQ_PWM2 6
    +#define STMPE1601_IRQ_PWM1 5
    +#define STMPE1601_IRQ_PWM0 4
    +#define STMPE1601_IRQ_KEYPAD_OVER 2
    +#define STMPE1601_IRQ_KEYPAD 1
    +#define STMPE1601_IRQ_WAKEUP 0
    +#define STMPE1601_NR_INTERNAL_IRQS 9
    +
    +#define STMPE1601_REG_SYS_CTRL 0x02
    +#define STMPE1601_REG_ICR_LSB 0x11
    +#define STMPE1601_REG_IER_LSB 0x13
    +#define STMPE1601_REG_ISR_MSB 0x14
    +#define STMPE1601_REG_CHIP_ID 0x80
    +#define STMPE1601_REG_INT_EN_GPIO_MASK_LSB 0x17
    +#define STMPE1601_REG_INT_STA_GPIO_MSB 0x18
    +#define STMPE1601_REG_GPIO_MP_LSB 0x87
    +#define STMPE1601_REG_GPIO_SET_LSB 0x83
    +#define STMPE1601_REG_GPIO_CLR_LSB 0x85
    +#define STMPE1601_REG_GPIO_SET_DIR_LSB 0x89
    +#define STMPE1601_REG_GPIO_ED_MSB 0x8A
    +#define STMPE1601_REG_GPIO_RE_LSB 0x8D
    +#define STMPE1601_REG_GPIO_FE_LSB 0x8F
    +#define STMPE1601_REG_GPIO_AF_U_MSB 0x92
    +
    +#define STMPE1601_SYS_CTRL_ENABLE_GPIO (1 << 3)
    +#define STMPE1601_SYS_CTRL_ENABLE_KPC (1 << 1)
    +#define STMPE1601_SYSCON_ENABLE_SPWM (1 << 0)
    +
    +/*
    + * STMPE24xx
    + */
    +
    +#define STMPE24XX_IRQ_GPIOC 8
    +#define STMPE24XX_IRQ_PWM2 7
    +#define STMPE24XX_IRQ_PWM1 6
    +#define STMPE24XX_IRQ_PWM0 5
    +#define STMPE24XX_IRQ_ROT_OVER 4
    +#define STMPE24XX_IRQ_ROT 3
    +#define STMPE24XX_IRQ_KEYPAD_OVER 2
    +#define STMPE24XX_IRQ_KEYPAD 1
    +#define STMPE24XX_IRQ_WAKEUP 0
    +#define STMPE24XX_NR_INTERNAL_IRQS 9
    +
    +#define STMPE24XX_REG_SYS_CTRL 0x02
    +#define STMPE24XX_REG_ICR_LSB 0x11
    +#define STMPE24XX_REG_IER_LSB 0x13
    +#define STMPE24XX_REG_ISR_MSB 0x14
    +#define STMPE24XX_REG_CHIP_ID 0x80
    +#define STMPE24XX_REG_IEGPIOR_LSB 0x18
    +#define STMPE24XX_REG_ISGPIOR_MSB 0x19
    +#define STMPE24XX_REG_GPMR_LSB 0xA5
    +#define STMPE24XX_REG_GPSR_LSB 0x85
    +#define STMPE24XX_REG_GPCR_LSB 0x88
    +#define STMPE24XX_REG_GPDR_LSB 0x8B
    +#define STMPE24XX_REG_GPEDR_MSB 0x8C
    +#define STMPE24XX_REG_GPRER_LSB 0x91
    +#define STMPE24XX_REG_GPFER_LSB 0x94
    +#define STMPE24XX_REG_GPAFR_U_MSB 0x9B
    +
    +#define STMPE24XX_SYS_CTRL_ENABLE_GPIO (1 << 3)
    +#define STMPE24XX_SYSCON_ENABLE_PWM (1 << 2)
    +#define STMPE24XX_SYS_CTRL_ENABLE_KPC (1 << 1)
    +#define STMPE24XX_SYSCON_ENABLE_ROT (1 << 0)
    +
    +#endif
    diff --git a/include/linux/mfd/stmpe.h b/include/linux/mfd/stmpe.h
    new file mode 100644
    index 0000000..ad10c7b
    --- /dev/null
    +++ b/include/linux/mfd/stmpe.h
    @@ -0,0 +1,154 @@
    +/*
    + * Copyright (C) ST-Ericsson SA 2010
    + *
    + * License Terms: GNU General Public License, version 2
    + * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
    + */
    +
    +#ifndef __LINUX_MFD_STMPE_H
    +#define __LINUX_MFD_STMPE_H
    +
    +#include <linux/device.h>
    +
    +enum stmpe_block {
    + STMPE_BLOCK_GPIO = 1 << 0,
    + STMPE_BLOCK_KEYPAD = 1 << 1,
    + STMPE_BLOCK_TOUCHSCREEN = 1 << 2,
    + STMPE_BLOCK_ADC = 1 << 3,
    + STMPE_BLOCK_PWM = 1 << 4,
    + STMPE_BLOCK_ROTATOR = 1 << 5,
    +};
    +
    +enum stmpe_partnum {
    + STMPE811,
    + STMPE1601,
    + STMPE2401,
    + STMPE2403,
    +};
    +
    +/*
    + * For registers whose locations differ on variants, the correct address is
    + * obtained by indexing stmpe->regs with one of the following.
    + */
    +enum {
    + STMPE_IDX_CHIP_ID,
    + STMPE_IDX_ICR_LSB,
    + STMPE_IDX_IER_LSB,
    + STMPE_IDX_ISR_MSB,
    + STMPE_IDX_GPMR_LSB,
    + STMPE_IDX_GPSR_LSB,
    + STMPE_IDX_GPCR_LSB,
    + STMPE_IDX_GPDR_LSB,
    + STMPE_IDX_GPEDR_MSB,
    + STMPE_IDX_GPRER_LSB,
    + STMPE_IDX_GPFER_LSB,
    + STMPE_IDX_GPAFR_U_MSB,
    + STMPE_IDX_IEGPIOR_LSB,
    + STMPE_IDX_ISGPIOR_MSB,
    + STMPE_IDX_MAX,
    +};
    +
    +
    +struct stmpe_variant_info;
    +
    +/**
    + * struct stmpe - STMPE MFD structure
    + * @lock: lock protecting I/O operations
    + * @irq_lock: IRQ bus lock
    + * @dev: device, mostly for dev_dbg()
    + * @i2c: i2c client
    + * @variant: the detected STMPE model number
    + * @regs: list of addresses of registers which are at different addresses on
    + * different variants. Indexed by one of STMPE_IDX_*.
    + * @irq_base: starting IRQ number for internal IRQs
    + * @num_gpios: number of gpios, differs for variants
    + * @ier: cache of IER registers for bus_lock
    + * @oldier: cache of IER registers for bus_lock
    + * @pdata: platform data
    + */
    +struct stmpe {
    + struct mutex lock;
    + struct mutex irq_lock;
    + struct device *dev;
    + struct i2c_client *i2c;
    + enum stmpe_partnum partnum;
    + struct stmpe_variant_info *variant;
    + const u8 *regs;
    +
    + int irq_base;
    + int num_gpios;
    + u8 ier[2];
    + u8 oldier[2];
    + struct stmpe_platform_data *pdata;
    +};
    +
    +extern int stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 data);
    +extern int stmpe_reg_read(struct stmpe *stmpe, u8 reg);
    +extern int stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length,
    + u8 *values);
    +extern int stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
    + const u8 *values);
    +extern int stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val);
    +extern int stmpe_set_altfunc(struct stmpe *stmpe, u32 pins,
    + enum stmpe_block block);
    +extern int stmpe_enable(struct stmpe *stmpe, unsigned int blocks);
    +extern int stmpe_disable(struct stmpe *stmpe, unsigned int blocks);
    +
    +struct matrix_keymap_data;
    +
    +/**
    + * struct stmpe_keypad_platform_data - STMPE keypad platform data
    + * @keymap_data: key map table and size
    + * @debounce_ms: debounce interval, in ms. Maximum is
    + * %STMPE_KEYPAD_MAX_DEBOUNCE.
    + * @scan_count: number of key scanning cycles to confirm key data.
    + * Maximum is %STMPE_KEYPAD_MAX_SCAN_COUNT.
    + * @no_autorepeat: disable key autorepeat
    + */
    +struct stmpe_keypad_platform_data {
    + struct matrix_keymap_data *keymap_data;
    + unsigned int debounce_ms;
    + unsigned int scan_count;
    + bool no_autorepeat;
    +};
    +
    +/**
    + * struct stmpe_gpio_platform_data - STMPE GPIO platform data
    + * @gpio_base: first gpio number assigned. A maximum of
    + * %STMPE_NR_GPIOS GPIOs will be allocated.
    + */
    +struct stmpe_gpio_platform_data {
    + int gpio_base;
    + void (*setup)(struct stmpe *stmpe, unsigned gpio_base);
    + void (*remove)(struct stmpe *stmpe, unsigned gpio_base);
    +};
    +
    +/**
    + * struct stmpe_platform_data - STMPE platform data
    + * @id: device id to distinguish between multiple STMPEs on the same board
    + * @blocks: bitmask of blocks to enable (use STMPE_BLOCK_*)
    + * @irq_trigger: IRQ trigger to use for the interrupt to the host
    + * @irq_invert_polarity: IRQ line is connected with reversed polarity
    + * @irq_base: base IRQ number. %STMPE_NR_IRQS irqs will be used, or
    + * %STMPE_NR_INTERNAL_IRQS if the GPIO driver is not used.
    + * @gpio: GPIO-specific platform data
    + * @keypad: keypad-specific platform data
    + */
    +struct stmpe_platform_data {
    + int id;
    + unsigned int blocks;
    + int irq_base;
    + unsigned int irq_trigger;
    + bool irq_invert_polarity;
    +
    + struct stmpe_gpio_platform_data *gpio;
    + struct stmpe_keypad_platform_data *keypad;
    +};
    +
    +#define STMPE_NR_INTERNAL_IRQS 9
    +#define STMPE_INT_GPIO(x) (STMPE_NR_INTERNAL_IRQS + (x))
    +
    +#define STMPE_NR_GPIOS 24
    +#define STMPE_NR_IRQS STMPE_INT_GPIO(STMPE_NR_GPIOS)
    +
    +#endif
    --
    1.7.0


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