mfd: smsc: Add support for smsc gpio io/keypad driver (8284328c) · Commits · e / devices / android_kernel_xiaomi_markw

Documentation/smsc_ece1099.txt

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		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.

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

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)

drivers/mfd/smsc-ece1099.c

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		/*
		* 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");

include/linux/mfd/smsc.h

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		/*
		* 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 */