mfd: smsc: Add support for smsc gpio io/keypad driver
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
Samuel Ortiz
parent
c6bed9deb6
commit
8284328cd9
|
|
@ -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.
|
||||
|
|
@ -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
|
||||
|
|
|
|||
|
|
@ -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)
|
||||
|
|
|
|||
|
|
@ -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");
|
||||
|
|
@ -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 */
|
||||
Reference in New Issue