path: root/drivers/i2c/chips/tps65010.c

/*
 * tps65010 - driver for tps6501x power management chips
 *
 * Copyright (C) 2004 Texas Instruments
 * Copyright (C) 2004-2005 David Brownell
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/suspend.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>

#include <asm/irq.h>
#include <asm/mach-types.h>

#include <asm/arch/gpio.h>
#include <asm/arch/mux.h>
#include <asm/arch/tps65010.h>

/*-------------------------------------------------------------------------*/

#define	DRIVER_VERSION	"2 May 2005"
#define	DRIVER_NAME	(tps65010_driver.name)

MODULE_DESCRIPTION("TPS6501x Power Management Driver");
MODULE_LICENSE("GPL");

static unsigned short normal_i2c[] = { 0x48, /* 0x49, */ I2C_CLIENT_END };
static unsigned short normal_i2c_range[] = { I2C_CLIENT_END };

I2C_CLIENT_INSMOD;

static struct i2c_driver tps65010_driver;

/*-------------------------------------------------------------------------*/

/* This driver handles a family of multipurpose chips, which incorporate
 * voltage regulators, lithium ion/polymer battery charging, GPIOs, LEDs,
 * and other features often needed in portable devices like cell phones
 * or digital cameras.
 *
 * The tps65011 and tps65013 have different voltage settings compared
 * to tps65010 and tps65012.  The tps65013 has a NO_CHG status/irq.
 * All except tps65010 have "wait" mode, possibly defaulted so that
 * battery-insert != device-on.
 *
 * We could distinguish between some models by checking VDCDC1.UVLO or
 * other registers, unless they've been changed already after powerup
 * as part of board setup by a bootloader.
 */
enum tps_model {
	TPS_UNKNOWN = 0,
	TPS65010,
	TPS65011,
	TPS65012,
	TPS65013,
};

struct tps65010 {
	struct i2c_client	client;
	struct semaphore	lock;
	int			irq;
	struct work_struct	work;
	struct dentry		*file;
	unsigned		charging:1;
	unsigned		por:1;
	unsigned		model:8;
	u16			vbus;
	unsigned long		flags;
#define	FLAG_VBUS_CHANGED	0
#define	FLAG_IRQ_ENABLE		1

	/* copies of last register state */
	u8			chgstatus, regstatus, chgconf;
	u8			nmask1, nmask2;

	/* not currently tracking GPIO state */
};

#define	POWER_POLL_DELAY	msecs_to_jiffies(800)

/*-------------------------------------------------------------------------*/

#if	defined(DEBUG) || defined(CONFIG_DEBUG_FS)

static void dbg_chgstat(char *buf, size_t len, u8 chgstatus)
{
	snprintf(buf, len, "%02x%s%s%s%s%s%s%s%s\n",
		chgstatus,
		(chgstatus & TPS_CHG_USB) ? " USB" : "",
		(chgstatus & TPS_CHG_AC) ? " AC" : "",
		(chgstatus & TPS_CHG_THERM) ? " therm" : "",
		(chgstatus & TPS_CHG_TERM) ? " done" :
			((chgstatus & (TPS_CHG_USB|TPS_CHG_AC))
				? " (charging)" : ""),
		(chgstatus & TPS_CHG_TAPER_TMO) ? " taper_tmo" : "",
		(chgstatus & TPS_CHG_CHG_TMO) ? " charge_tmo" : "",
		(chgstatus & TPS_CHG_PRECHG_TMO) ? " prechg_tmo" : "",
		(chgstatus & TPS_CHG_TEMP_ERR) ? " temp_err" : "");
}

static void dbg_regstat(char *buf, size_t len, u8 regstatus)
{
	snprintf(buf, len, "%02x %s%s%s%s%s%s%s%s\n",
		regstatus,
		(regstatus & TPS_REG_ONOFF) ? "off" : "(on)",
		(regstatus & TPS_REG_COVER) ? " uncover" : "",
		(regstatus & TPS_REG_UVLO) ? " UVLO" : "",
		(regstatus & TPS_REG_NO_CHG) ? " NO_CHG" : "",
		(regstatus & TPS_REG_PG_LD02) ? " ld02_bad" : "",
		(regstatus & TPS_REG_PG_LD01) ? " ld01_bad" : "",
		(regstatus & TPS_REG_PG_MAIN) ? " main_bad" : "",
		(regstatus & TPS_REG_PG_CORE) ? " core_bad" : "");
}

static void dbg_chgconf(int por, char *buf, size_t len, u8 chgconfig)
{
	const char <