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mfd: smsc: Add support for smsc gpio io/keypad driver

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smsc ece1099 is a keyboard scan or gpio expansion device.
The patch create keypad and gpio expander child for this
multi function smsc driver.

Cc: Benoit Cousson <b-cousson@ti.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Sourav Poddar 2012-10-01 16:31:22 +05:30 committed by Samuel Ortiz
parent c6bed9deb6
commit 8284328cd9
5 changed files with 291 additions and 0 deletions
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56
Documentation/smsc_ece1099.txt Normal file
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@ -0,0 +1,56 @@
What is smsc-ece1099?
----------------------
The ECE1099 is a 40-Pin 3.3V Keyboard Scan Expansion
or GPIO Expansion device. The device supports a keyboard
scan matrix of 23x8. The device is connected to a Master
via the SMSC BC-Link interface or via the SMBus.
Keypad scan Input(KSI) and Keypad Scan Output(KSO) signals
are multiplexed with GPIOs.
Interrupt generation
--------------------
Interrupts can be generated by an edge detection on a GPIO
pin or an edge detection on one of the bus interface pins.
Interrupts can also be detected on the keyboard scan interface.
The bus interrupt pin (BC_INT# or SMBUS_INT#) is asserted if
any bit in one of the Interrupt Status registers is 1 and
the corresponding Interrupt Mask bit is also 1.
In order for software to determine which device is the source
of an interrupt, it should first read the Group Interrupt Status Register
to determine which Status register group is a source for the interrupt.
Software should read both the Status register and the associated Mask register,
then AND the two values together. Bits that are 1 in the result of the AND
are active interrupts. Software clears an interrupt by writing a 1 to the
corresponding bit in the Status register.
Communication Protocol
----------------------
- SMbus slave Interface
The host processor communicates with the ECE1099 device
through a series of read/write registers via the SMBus
interface. SMBus is a serial communication protocol between
a computer host and its peripheral devices. The SMBus data
rate is 10KHz minimum to 400 KHz maximum
- Slave Bus Interface
The ECE1099 device SMBus implementation is a subset of the
SMBus interface to the host. The device is a slave-only SMBus device.
The implementation in the device is a subset of SMBus since it
only supports four protocols.
The Write Byte, Read Byte, Send Byte, and Receive Byte protocols are the
only valid SMBus protocols for the device.
- BC-LinkTM Interface
The BC-Link is a proprietary bus that allows communication
between a Master device and a Companion device. The Master
device uses this serial bus to read and write registers
located on the Companion device. The bus comprises three signals,
BC_CLK, BC_DAT and BC_INT#. The Master device always provides the
clock, BC_CLK, and the Companion device is the source for an
independent asynchronous interrupt signal, BC_INT#. The ECE1099
supports BC-Link speeds up to 24MHz.

12
drivers/mfd/Kconfig
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@ -375,6 +375,18 @@ config MFD_T7L66XB
help
Support for Toshiba Mobile IO Controller T7L66XB
config MFD_SMSC
bool "Support for the SMSC ECE1099 series chips"
depends on I2C=y
select MFD_CORE
select REGMAP_I2C
help
If you say yes here you get support for the
ece1099 chips from SMSC.
To compile this driver as a module, choose M here: the
module will be called smsc.
config MFD_TC6387XB
bool "Support Toshiba TC6387XB"
depends on ARM && HAVE_CLK

1
drivers/mfd/Makefile
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@ -76,6 +76,7 @@ obj-$(CONFIG_EZX_PCAP) += ezx-pcap.o
obj-$(CONFIG_MCP) += mcp-core.o
obj-$(CONFIG_MCP_SA11X0) += mcp-sa11x0.o
obj-$(CONFIG_MCP_UCB1200) += ucb1x00-core.o
obj-$(CONFIG_MFD_SMSC) += smsc-ece1099.o
obj-$(CONFIG_MCP_UCB1200_TS) += ucb1x00-ts.o
ifeq ($(CONFIG_SA1100_ASSABET),y)

113
drivers/mfd/smsc-ece1099.c Normal file
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@ -0,0 +1,113 @@
/*
* TI SMSC MFD Driver
*
* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
*
* Author: Sourav Poddar <sourav.poddar@ti.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; GPL v2.
*
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/workqueue.h>
#include <linux/irq.h>
#include <linux/regmap.h>
#include <linux/err.h>
#include <linux/mfd/core.h>
#include <linux/mfd/smsc.h>
#include <linux/of_platform.h>
static struct regmap_config smsc_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = SMSC_VEN_ID_H,
.cache_type = REGCACHE_RBTREE,
};
static int smsc_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct smsc *smsc;
int devid, rev, venid_l, venid_h;
int ret = 0;
smsc = devm_kzalloc(&i2c->dev, sizeof(struct smsc),
GFP_KERNEL);
if (!smsc) {
dev_err(&i2c->dev, "smsc mfd driver memory allocation failed\n");
return -ENOMEM;
}
smsc->regmap = devm_regmap_init_i2c(i2c, &smsc_regmap_config);
if (IS_ERR(smsc->regmap)) {
ret = PTR_ERR(smsc->regmap);
goto err;
}
i2c_set_clientdata(i2c, smsc);
smsc->dev = &i2c->dev;
#ifdef CONFIG_OF
of_property_read_u32(i2c->dev.of_node, "clock", &smsc->clk);
#endif
regmap_read(smsc->regmap, SMSC_DEV_ID, &devid);
regmap_read(smsc->regmap, SMSC_DEV_REV, &rev);
regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l);
regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h);
dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n",
devid, rev, (venid_h << 8) | venid_l);
ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk);
if (ret)
goto err;
#ifdef CONFIG_OF
if (i2c->dev.of_node)
ret = of_platform_populate(i2c->dev.of_node,
NULL, NULL, &i2c->dev);
#endif
err:
return ret;
}
static int smsc_i2c_remove(struct i2c_client *i2c)
{
struct smsc *smsc = i2c_get_clientdata(i2c);
mfd_remove_devices(smsc->dev);
return 0;
}
static const struct i2c_device_id smsc_i2c_id[] = {
{ "smscece1099", 0},
{},
};
MODULE_DEVICE_TABLE(i2c, smsc_i2c_id);
static struct i2c_driver smsc_i2c_driver = {
.driver = {
.name = "smsc",
.owner = THIS_MODULE,
},
.probe = smsc_i2c_probe,
.remove = smsc_i2c_remove,
.id_table = smsc_i2c_id,
};
module_i2c_driver(smsc_i2c_driver);
MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>");
MODULE_DESCRIPTION("SMSC chip multi-function driver");
MODULE_LICENSE("GPL v2");

109
include/linux/mfd/smsc.h Normal file
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@ -0,0 +1,109 @@
/*
* SMSC ECE1099
*
* Copyright 2012 Texas Instruments Inc.
*
* Author: Sourav Poddar <sourav.poddar@ti.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#ifndef __LINUX_MFD_SMSC_H
#define __LINUX_MFD_SMSC_H
#include <linux/regmap.h>
#define SMSC_ID_ECE1099 1
#define SMSC_NUM_CLIENTS 2
#define SMSC_BASE_ADDR 0x38
#define OMAP_GPIO_SMSC_IRQ 151
#define SMSC_MAXGPIO 32
#define SMSC_BANK(offs) ((offs) >> 3)
#define SMSC_BIT(offs) (1u << ((offs) & 0x7))
struct smsc {
struct device *dev;
struct i2c_client *i2c_clients[SMSC_NUM_CLIENTS];
struct regmap *regmap;
int clk;
/* Stored chip id */
int id;
};
struct smsc_gpio;
struct smsc_keypad;
static inline int smsc_read(struct device *child, unsigned int reg,
unsigned int *dest)
{
struct smsc *smsc = dev_get_drvdata(child->parent);
return regmap_read(smsc->regmap, reg, dest);
}
static inline int smsc_write(struct device *child, unsigned int reg,
unsigned int value)
{
struct smsc *smsc = dev_get_drvdata(child->parent);
return regmap_write(smsc->regmap, reg, value);
}
/* Registers for SMSC */
#define SMSC_RESET 0xF5
#define SMSC_GRP_INT 0xF9
#define SMSC_CLK_CTRL 0xFA
#define SMSC_WKUP_CTRL 0xFB
#define SMSC_DEV_ID 0xFC
#define SMSC_DEV_REV 0xFD
#define SMSC_VEN_ID_L 0xFE
#define SMSC_VEN_ID_H 0xFF
/* CLK VALUE */
#define SMSC_CLK_VALUE 0x13
/* Registers for function GPIO INPUT */
#define SMSC_GPIO_DATA_IN_START 0x00
/* Registers for function GPIO OUPUT */
#define SMSC_GPIO_DATA_OUT_START 0x05
/* Definitions for SMSC GPIO CONFIGURATION REGISTER*/
#define SMSC_GPIO_INPUT_LOW 0x01
#define SMSC_GPIO_INPUT_RISING 0x09
#define SMSC_GPIO_INPUT_FALLING 0x11
#define SMSC_GPIO_INPUT_BOTH_EDGE 0x19
#define SMSC_GPIO_OUTPUT_PP 0x21
#define SMSC_GPIO_OUTPUT_OP 0x31
#define GRP_INT_STAT 0xf9
#define SMSC_GPI_INT 0x0f
#define SMSC_CFG_START 0x0A
/* Registers for SMSC GPIO INTERRUPT STATUS REGISTER*/
#define SMSC_GPIO_INT_STAT_START 0x32
/* Registers for SMSC GPIO INTERRUPT MASK REGISTER*/
#define SMSC_GPIO_INT_MASK_START 0x37
/* Registers for SMSC function KEYPAD*/
#define SMSC_KP_OUT 0x40
#define SMSC_KP_IN 0x41
#define SMSC_KP_INT_STAT 0x42
#define SMSC_KP_INT_MASK 0x43
/* Definitions for keypad */
#define SMSC_KP_KSO 0x70
#define SMSC_KP_KSI 0x51
#define SMSC_KSO_ALL_LOW 0x20
#define SMSC_KP_SET_LOW_PWR 0x0B
#define SMSC_KP_SET_HIGH 0xFF
#define SMSC_KSO_EVAL 0x00
#endif /* __LINUX_MFD_SMSC_H */