menelaus.c 29.7 KB
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/*
 * Copyright (C) 2004 Texas Instruments, Inc.
 *
 * Some parts based tps65010.c:
 * Copyright (C) 2004 Texas Instruments and
 * Copyright (C) 2004-2005 David Brownell
 *
 * Some parts based on tlv320aic24.c:
 * Copyright (C) by Kai Svahn <kai.svahn@nokia.com>
 *
 * Changes for interrupt handling and clean-up by
 * Tony Lindgren <tony@atomide.com> and Imre Deak <imre.deak@nokia.com>
 * Cleanup and generalized support for voltage setting by
 * Juha Yrjola
 * Added support for controlling VCORE and regulator sleep states,
 * Amit Kucheria <amit.kucheria@nokia.com>
 * Copyright (C) 2005, 2006 Nokia Corporation
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
#include <linux/delay.h>
#include <linux/rtc.h>
#include <linux/bcd.h>

#include <asm/mach/irq.h>

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#include <mach/gpio.h>
#include <mach/menelaus.h>
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#define DRIVER_NAME			"menelaus"

#define MENELAUS_I2C_ADDRESS		0x72

#define MENELAUS_REV			0x01
#define MENELAUS_VCORE_CTRL1		0x02
#define MENELAUS_VCORE_CTRL2		0x03
#define MENELAUS_VCORE_CTRL3		0x04
#define MENELAUS_VCORE_CTRL4		0x05
#define MENELAUS_VCORE_CTRL5		0x06
#define MENELAUS_DCDC_CTRL1		0x07
#define MENELAUS_DCDC_CTRL2		0x08
#define MENELAUS_DCDC_CTRL3		0x09
#define MENELAUS_LDO_CTRL1		0x0A
#define MENELAUS_LDO_CTRL2		0x0B
#define MENELAUS_LDO_CTRL3		0x0C
#define MENELAUS_LDO_CTRL4		0x0D
#define MENELAUS_LDO_CTRL5		0x0E
#define MENELAUS_LDO_CTRL6		0x0F
#define MENELAUS_LDO_CTRL7		0x10
#define MENELAUS_LDO_CTRL8		0x11
#define MENELAUS_SLEEP_CTRL1		0x12
#define MENELAUS_SLEEP_CTRL2		0x13
#define MENELAUS_DEVICE_OFF		0x14
#define MENELAUS_OSC_CTRL		0x15
#define MENELAUS_DETECT_CTRL		0x16
#define MENELAUS_INT_MASK1		0x17
#define MENELAUS_INT_MASK2		0x18
#define MENELAUS_INT_STATUS1		0x19
#define MENELAUS_INT_STATUS2		0x1A
#define MENELAUS_INT_ACK1		0x1B
#define MENELAUS_INT_ACK2		0x1C
#define MENELAUS_GPIO_CTRL		0x1D
#define MENELAUS_GPIO_IN		0x1E
#define MENELAUS_GPIO_OUT		0x1F
#define MENELAUS_BBSMS			0x20
#define MENELAUS_RTC_CTRL		0x21
#define MENELAUS_RTC_UPDATE		0x22
#define MENELAUS_RTC_SEC		0x23
#define MENELAUS_RTC_MIN		0x24
#define MENELAUS_RTC_HR			0x25
#define MENELAUS_RTC_DAY		0x26
#define MENELAUS_RTC_MON		0x27
#define MENELAUS_RTC_YR			0x28
#define MENELAUS_RTC_WKDAY		0x29
#define MENELAUS_RTC_AL_SEC		0x2A
#define MENELAUS_RTC_AL_MIN		0x2B
#define MENELAUS_RTC_AL_HR		0x2C
#define MENELAUS_RTC_AL_DAY		0x2D
#define MENELAUS_RTC_AL_MON		0x2E
#define MENELAUS_RTC_AL_YR		0x2F
#define MENELAUS_RTC_COMP_MSB		0x30
#define MENELAUS_RTC_COMP_LSB		0x31
#define MENELAUS_S1_PULL_EN		0x32
#define MENELAUS_S1_PULL_DIR		0x33
#define MENELAUS_S2_PULL_EN		0x34
#define MENELAUS_S2_PULL_DIR		0x35
#define MENELAUS_MCT_CTRL1		0x36
#define MENELAUS_MCT_CTRL2		0x37
#define MENELAUS_MCT_CTRL3		0x38
#define MENELAUS_MCT_PIN_ST		0x39
#define MENELAUS_DEBOUNCE1		0x3A

#define IH_MENELAUS_IRQS		12
#define MENELAUS_MMC_S1CD_IRQ		0	/* MMC slot 1 card change */
#define MENELAUS_MMC_S2CD_IRQ		1	/* MMC slot 2 card change */
#define MENELAUS_MMC_S1D1_IRQ		2	/* MMC DAT1 low in slot 1 */
#define MENELAUS_MMC_S2D1_IRQ		3	/* MMC DAT1 low in slot 2 */
#define MENELAUS_LOWBAT_IRQ		4	/* Low battery */
#define MENELAUS_HOTDIE_IRQ		5	/* Hot die detect */
#define MENELAUS_UVLO_IRQ		6	/* UVLO detect */
#define MENELAUS_TSHUT_IRQ		7	/* Thermal shutdown */
#define MENELAUS_RTCTMR_IRQ		8	/* RTC timer */
#define MENELAUS_RTCALM_IRQ		9	/* RTC alarm */
#define MENELAUS_RTCERR_IRQ		10	/* RTC error */
#define MENELAUS_PSHBTN_IRQ		11	/* Push button */
#define MENELAUS_RESERVED12_IRQ		12	/* Reserved */
#define MENELAUS_RESERVED13_IRQ		13	/* Reserved */
#define MENELAUS_RESERVED14_IRQ		14	/* Reserved */
#define MENELAUS_RESERVED15_IRQ		15	/* Reserved */

static void menelaus_work(struct work_struct *_menelaus);

struct menelaus_chip {
	struct mutex		lock;
	struct i2c_client	*client;
	struct work_struct	work;
#ifdef CONFIG_RTC_DRV_TWL92330
	struct rtc_device	*rtc;
	u8			rtc_control;
	unsigned		uie:1;
#endif
	unsigned		vcore_hw_mode:1;
	u8			mask1, mask2;
	void			(*handlers[16])(struct menelaus_chip *);
	void			(*mmc_callback)(void *data, u8 mask);
	void			*mmc_callback_data;
};

static struct menelaus_chip *the_menelaus;

static int menelaus_write_reg(int reg, u8 value)
{
	int val = i2c_smbus_write_byte_data(the_menelaus->client, reg, value);

	if (val < 0) {
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		pr_err(DRIVER_NAME ": write error");
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		return val;
	}

	return 0;
}

static int menelaus_read_reg(int reg)
{
	int val = i2c_smbus_read_byte_data(the_menelaus->client, reg);

	if (val < 0)
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		pr_err(DRIVER_NAME ": read error");
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	return val;
}

static int menelaus_enable_irq(int irq)
{
	if (irq > 7) {
		irq -= 8;
		the_menelaus->mask2 &= ~(1 << irq);
		return menelaus_write_reg(MENELAUS_INT_MASK2,
				the_menelaus->mask2);
	} else {
		the_menelaus->mask1 &= ~(1 << irq);
		return menelaus_write_reg(MENELAUS_INT_MASK1,
				the_menelaus->mask1);
	}
}

static int menelaus_disable_irq(int irq)
{
	if (irq > 7) {
		irq -= 8;
		the_menelaus->mask2 |= (1 << irq);
		return menelaus_write_reg(MENELAUS_INT_MASK2,
				the_menelaus->mask2);
	} else {
		the_menelaus->mask1 |= (1 << irq);
		return menelaus_write_reg(MENELAUS_INT_MASK1,
				the_menelaus->mask1);
	}
}

static int menelaus_ack_irq(int irq)
{
	if (irq > 7)
		return menelaus_write_reg(MENELAUS_INT_ACK2, 1 << (irq - 8));
	else
		return menelaus_write_reg(MENELAUS_INT_ACK1, 1 << irq);
}

/* Adds a handler for an interrupt. Does not run in interrupt context */
static int menelaus_add_irq_work(int irq,
		void (*handler)(struct menelaus_chip *))
{
	int ret = 0;

	mutex_lock(&the_menelaus->lock);
	the_menelaus->handlers[irq] = handler;
	ret = menelaus_enable_irq(irq);
	mutex_unlock(&the_menelaus->lock);

	return ret;
}

/* Removes handler for an interrupt */
static int menelaus_remove_irq_work(int irq)
{
	int ret = 0;

	mutex_lock(&the_menelaus->lock);
	ret = menelaus_disable_irq(irq);
	the_menelaus->handlers[irq] = NULL;
	mutex_unlock(&the_menelaus->lock);

	return ret;
}

/*
 * Gets scheduled when a card detect interrupt happens. Note that in some cases
 * this line is wired to card cover switch rather than the card detect switch
 * in each slot. In this case the cards are not seen by menelaus.
 * FIXME: Add handling for D1 too
 */
static void menelaus_mmc_cd_work(struct menelaus_chip *menelaus_hw)
{
	int reg;
	unsigned char card_mask = 0;

	reg = menelaus_read_reg(MENELAUS_MCT_PIN_ST);
	if (reg < 0)
		return;

	if (!(reg & 0x1))
		card_mask |= (1 << 0);

	if (!(reg & 0x2))
		card_mask |= (1 << 1);

	if (menelaus_hw->mmc_callback)
		menelaus_hw->mmc_callback(menelaus_hw->mmc_callback_data,
					  card_mask);
}

/*
 * Toggles the MMC slots between open-drain and push-pull mode.
 */
int menelaus_set_mmc_opendrain(int slot, int enable)
{
	int ret, val;

	if (slot != 1 && slot != 2)
		return -EINVAL;
	mutex_lock(&the_menelaus->lock);
	ret = menelaus_read_reg(MENELAUS_MCT_CTRL1);
	if (ret < 0) {
		mutex_unlock(&the_menelaus->lock);
		return ret;
	}
	val = ret;
	if (slot == 1) {
		if (enable)
			val |= 1 << 2;
		else
			val &= ~(1 << 2);
	} else {
		if (enable)
			val |= 1 << 3;
		else
			val &= ~(1 << 3);
	}
	ret = menelaus_write_reg(MENELAUS_MCT_CTRL1, val);
	mutex_unlock(&the_menelaus->lock);

	return ret;
}
EXPORT_SYMBOL(menelaus_set_mmc_opendrain);

int menelaus_set_slot_sel(int enable)
{
	int ret;

	mutex_lock(&the_menelaus->lock);
	ret = menelaus_read_reg(MENELAUS_GPIO_CTRL);
	if (ret < 0)
		goto out;
	ret |= 0x02;
	if (enable)
		ret |= 1 << 5;
	else
		ret &= ~(1 << 5);
	ret = menelaus_write_reg(MENELAUS_GPIO_CTRL, ret);
out:
	mutex_unlock(&the_menelaus->lock);
	return ret;
}
EXPORT_SYMBOL(menelaus_set_slot_sel);

int menelaus_set_mmc_slot(int slot, int enable, int power, int cd_en)
{
	int ret, val;

	if (slot != 1 && slot != 2)
		return -EINVAL;
	if (power >= 3)
		return -EINVAL;

	mutex_lock(&the_menelaus->lock);

	ret = menelaus_read_reg(MENELAUS_MCT_CTRL2);
	if (ret < 0)
		goto out;
	val = ret;
	if (slot == 1) {
		if (cd_en)
			val |= (1 << 4) | (1 << 6);
		else
			val &= ~((1 << 4) | (1 << 6));
	} else {
		if (cd_en)
			val |= (1 << 5) | (1 << 7);
		else
			val &= ~((1 << 5) | (1 << 7));
	}
	ret = menelaus_write_reg(MENELAUS_MCT_CTRL2, val);
	if (ret < 0)
		goto out;

	ret = menelaus_read_reg(MENELAUS_MCT_CTRL3);
	if (ret < 0)
		goto out;
	val = ret;
	if (slot == 1) {
		if (enable)
			val |= 1 << 0;
		else
			val &= ~(1 << 0);
	} else {
		int b;

		if (enable)
			ret |= 1 << 1;
		else
			ret &= ~(1 << 1);
		b = menelaus_read_reg(MENELAUS_MCT_CTRL2);
		b &= ~0x03;
		b |= power;
		ret = menelaus_write_reg(MENELAUS_MCT_CTRL2, b);
		if (ret < 0)
			goto out;
	}
	/* Disable autonomous shutdown */
	val &= ~(0x03 << 2);
	ret = menelaus_write_reg(MENELAUS_MCT_CTRL3, val);
out:
	mutex_unlock(&the_menelaus->lock);
	return ret;
}
EXPORT_SYMBOL(menelaus_set_mmc_slot);

int menelaus_register_mmc_callback(void (*callback)(void *data, u8 card_mask),
				   void *data)
{
	int ret = 0;

	the_menelaus->mmc_callback_data = data;
	the_menelaus->mmc_callback = callback;
	ret = menelaus_add_irq_work(MENELAUS_MMC_S1CD_IRQ,
				    menelaus_mmc_cd_work);
	if (ret < 0)
		return ret;
	ret = menelaus_add_irq_work(MENELAUS_MMC_S2CD_IRQ,
				    menelaus_mmc_cd_work);
	if (ret < 0)
		return ret;
	ret = menelaus_add_irq_work(MENELAUS_MMC_S1D1_IRQ,
				    menelaus_mmc_cd_work);
	if (ret < 0)
		return ret;
	ret = menelaus_add_irq_work(MENELAUS_MMC_S2D1_IRQ,
				    menelaus_mmc_cd_work);

	return ret;
}
EXPORT_SYMBOL(menelaus_register_mmc_callback);

void menelaus_unregister_mmc_callback(void)
{
	menelaus_remove_irq_work(MENELAUS_MMC_S1CD_IRQ);
	menelaus_remove_irq_work(MENELAUS_MMC_S2CD_IRQ);
	menelaus_remove_irq_work(MENELAUS_MMC_S1D1_IRQ);
	menelaus_remove_irq_work(MENELAUS_MMC_S2D1_IRQ);

	the_menelaus->mmc_callback = NULL;
	the_menelaus->mmc_callback_data = 0;
}
EXPORT_SYMBOL(menelaus_unregister_mmc_callback);

struct menelaus_vtg {
	const char *name;
	u8 vtg_reg;
	u8 vtg_shift;
	u8 vtg_bits;
	u8 mode_reg;
};

struct menelaus_vtg_value {
	u16 vtg;
	u16 val;
};

static int menelaus_set_voltage(const struct menelaus_vtg *vtg, int mV,
				int vtg_val, int mode)
{
	int val, ret;
	struct i2c_client *c = the_menelaus->client;

	mutex_lock(&the_menelaus->lock);
	if (vtg == 0)
		goto set_voltage;

	ret = menelaus_read_reg(vtg->vtg_reg);
	if (ret < 0)
		goto out;
	val = ret & ~(((1 << vtg->vtg_bits) - 1) << vtg->vtg_shift);
	val |= vtg_val << vtg->vtg_shift;

	dev_dbg(&c->dev, "Setting voltage '%s'"
			 "to %d mV (reg 0x%02x, val 0x%02x)\n",
			vtg->name, mV, vtg->vtg_reg, val);

	ret = menelaus_write_reg(vtg->vtg_reg, val);
	if (ret < 0)
		goto out;
set_voltage:
	ret = menelaus_write_reg(vtg->mode_reg, mode);
out:
	mutex_unlock(&the_menelaus->lock);
	if (ret == 0) {
		/* Wait for voltage to stabilize */
		msleep(1);
	}
	return ret;
}

static int menelaus_get_vtg_value(int vtg, const struct menelaus_vtg_value *tbl,
				  int n)
{
	int i;

	for (i = 0; i < n; i++, tbl++)
		if (tbl->vtg == vtg)
			return tbl->val;
	return -EINVAL;
}

/*
 * Vcore can be programmed in two ways:
 * SW-controlled: Required voltage is programmed into VCORE_CTRL1
 * HW-controlled: Required range (roof-floor) is programmed into VCORE_CTRL3
 * and VCORE_CTRL4
 *
 * Call correct 'set' function accordingly
 */

static const struct menelaus_vtg_value vcore_values[] = {
	{ 1000, 0 },
	{ 1025, 1 },
	{ 1050, 2 },
	{ 1075, 3 },
	{ 1100, 4 },
	{ 1125, 5 },
	{ 1150, 6 },
	{ 1175, 7 },
	{ 1200, 8 },
	{ 1225, 9 },
	{ 1250, 10 },
	{ 1275, 11 },
	{ 1300, 12 },
	{ 1325, 13 },
	{ 1350, 14 },
	{ 1375, 15 },
	{ 1400, 16 },
	{ 1425, 17 },
	{ 1450, 18 },
};

int menelaus_set_vcore_sw(unsigned int mV)
{
	int val, ret;
	struct i2c_client *c = the_menelaus->client;

	val = menelaus_get_vtg_value(mV, vcore_values,
				     ARRAY_SIZE(vcore_values));
	if (val < 0)
		return -EINVAL;

	dev_dbg(&c->dev, "Setting VCORE to %d mV (val 0x%02x)\n", mV, val);

	/* Set SW mode and the voltage in one go. */
	mutex_lock(&the_menelaus->lock);
	ret = menelaus_write_reg(MENELAUS_VCORE_CTRL1, val);
	if (ret == 0)
		the_menelaus->vcore_hw_mode = 0;
	mutex_unlock(&the_menelaus->lock);
	msleep(1);

	return ret;
}

int menelaus_set_vcore_hw(unsigned int roof_mV, unsigned int floor_mV)
{
	int fval, rval, val, ret;
	struct i2c_client *c = the_menelaus->client;

	rval = menelaus_get_vtg_value(roof_mV, vcore_values,
				      ARRAY_SIZE(vcore_values));
	if (rval < 0)
		return -EINVAL;
	fval = menelaus_get_vtg_value(floor_mV, vcore_values,
				      ARRAY_SIZE(vcore_values));
	if (fval < 0)
		return -EINVAL;

	dev_dbg(&c->dev, "Setting VCORE FLOOR to %d mV and ROOF to %d mV\n",
	       floor_mV, roof_mV);

	mutex_lock(&the_menelaus->lock);
	ret = menelaus_write_reg(MENELAUS_VCORE_CTRL3, fval);
	if (ret < 0)
		goto out;
	ret = menelaus_write_reg(MENELAUS_VCORE_CTRL4, rval);
	if (ret < 0)
		goto out;
	if (!the_menelaus->vcore_hw_mode) {
		val = menelaus_read_reg(MENELAUS_VCORE_CTRL1);
		/* HW mode, turn OFF byte comparator */
		val |= ((1 << 7) | (1 << 5));
		ret = menelaus_write_reg(MENELAUS_VCORE_CTRL1, val);
		the_menelaus->vcore_hw_mode = 1;
	}
	msleep(1);
out:
	mutex_unlock(&the_menelaus->lock);
	return ret;
}

static const struct menelaus_vtg vmem_vtg = {
	.name = "VMEM",
	.vtg_reg = MENELAUS_LDO_CTRL1,
	.vtg_shift = 0,
	.vtg_bits = 2,
	.mode_reg = MENELAUS_LDO_CTRL3,
};

static const struct menelaus_vtg_value vmem_values[] = {
	{ 1500, 0 },
	{ 1800, 1 },
	{ 1900, 2 },
	{ 2500, 3 },
};

int menelaus_set_vmem(unsigned int mV)
{
	int val;

	if (mV == 0)
		return menelaus_set_voltage(&vmem_vtg, 0, 0, 0);

	val = menelaus_get_vtg_value(mV, vmem_values, ARRAY_SIZE(vmem_values));
	if (val < 0)
		return -EINVAL;
	return menelaus_set_voltage(&vmem_vtg, mV, val, 0x02);
}
EXPORT_SYMBOL(menelaus_set_vmem);

static const struct menelaus_vtg vio_vtg = {
	.name = "VIO",
	.vtg_reg = MENELAUS_LDO_CTRL1,
	.vtg_shift = 2,
	.vtg_bits = 2,
	.mode_reg = MENELAUS_LDO_CTRL4,
};

static const struct menelaus_vtg_value vio_values[] = {
	{ 1500, 0 },
	{ 1800, 1 },
	{ 2500, 2 },
	{ 2800, 3 },
};

int menelaus_set_vio(unsigned int mV)
{
	int val;

	if (mV == 0)
		return menelaus_set_voltage(&vio_vtg, 0, 0, 0);

	val = menelaus_get_vtg_value(mV, vio_values, ARRAY_SIZE(vio_values));
	if (val < 0)
		return -EINVAL;
	return menelaus_set_voltage(&vio_vtg, mV, val, 0x02);
}
EXPORT_SYMBOL(menelaus_set_vio);

static const struct menelaus_vtg_value vdcdc_values[] = {
	{ 1500, 0 },
	{ 1800, 1 },
	{ 2000, 2 },
	{ 2200, 3 },
	{ 2400, 4 },
	{ 2800, 5 },
	{ 3000, 6 },
	{ 3300, 7 },
};

static const struct menelaus_vtg vdcdc2_vtg = {
	.name = "VDCDC2",
	.vtg_reg = MENELAUS_DCDC_CTRL1,
	.vtg_shift = 0,
	.vtg_bits = 3,
	.mode_reg = MENELAUS_DCDC_CTRL2,
};

static const struct menelaus_vtg vdcdc3_vtg = {
	.name = "VDCDC3",
	.vtg_reg = MENELAUS_DCDC_CTRL1,
	.vtg_shift = 3,
	.vtg_bits = 3,
	.mode_reg = MENELAUS_DCDC_CTRL3,
};

int menelaus_set_vdcdc(int dcdc, unsigned int mV)
{
	const struct menelaus_vtg *vtg;
	int val;

	if (dcdc != 2 && dcdc != 3)
		return -EINVAL;
	if (dcdc == 2)
		vtg = &vdcdc2_vtg;
	else
		vtg = &vdcdc3_vtg;

	if (mV == 0)
		return menelaus_set_voltage(vtg, 0, 0, 0);

	val = menelaus_get_vtg_value(mV, vdcdc_values,
				     ARRAY_SIZE(vdcdc_values));
	if (val < 0)
		return -EINVAL;
	return menelaus_set_voltage(vtg, mV, val, 0x03);
}

static const struct menelaus_vtg_value vmmc_values[] = {
	{ 1850, 0 },
	{ 2800, 1 },
	{ 3000, 2 },
	{ 3100, 3 },
};

static const struct menelaus_vtg vmmc_vtg = {
	.name = "VMMC",
	.vtg_reg = MENELAUS_LDO_CTRL1,
	.vtg_shift = 6,
	.vtg_bits = 2,
	.mode_reg = MENELAUS_LDO_CTRL7,
};

int menelaus_set_vmmc(unsigned int mV)
{
	int val;

	if (mV == 0)
		return menelaus_set_voltage(&vmmc_vtg, 0, 0, 0);

	val = menelaus_get_vtg_value(mV, vmmc_values, ARRAY_SIZE(vmmc_values));
	if (val < 0)
		return -EINVAL;
	return menelaus_set_voltage(&vmmc_vtg, mV, val, 0x02);
}
EXPORT_SYMBOL(menelaus_set_vmmc);


static const struct menelaus_vtg_value vaux_values[] = {
	{ 1500, 0 },
	{ 1800, 1 },
	{ 2500, 2 },
	{ 2800, 3 },
};

static const struct menelaus_vtg vaux_vtg = {
	.name = "VAUX",
	.vtg_reg = MENELAUS_LDO_CTRL1,
	.vtg_shift = 4,
	.vtg_bits = 2,
	.mode_reg = MENELAUS_LDO_CTRL6,
};

int menelaus_set_vaux(unsigned int mV)
{
	int val;

	if (mV == 0)
		return menelaus_set_voltage(&vaux_vtg, 0, 0, 0);

	val = menelaus_get_vtg_value(mV, vaux_values, ARRAY_SIZE(vaux_values));
	if (val < 0)
		return -EINVAL;
	return menelaus_set_voltage(&vaux_vtg, mV, val, 0x02);
}
EXPORT_SYMBOL(menelaus_set_vaux);

int menelaus_get_slot_pin_states(void)
{
	return menelaus_read_reg(MENELAUS_MCT_PIN_ST);
}
EXPORT_SYMBOL(menelaus_get_slot_pin_states);

int menelaus_set_regulator_sleep(int enable, u32 val)
{
	int t, ret;
	struct i2c_client *c = the_menelaus->client;

	mutex_lock(&the_menelaus->lock);
	ret = menelaus_write_reg(MENELAUS_SLEEP_CTRL2, val);
	if (ret < 0)
		goto out;

	dev_dbg(&c->dev, "regulator sleep configuration: %02x\n", val);

	ret = menelaus_read_reg(MENELAUS_GPIO_CTRL);
	if (ret < 0)
		goto out;
	t = ((1 << 6) | 0x04);
	if (enable)
		ret |= t;
	else
		ret &= ~t;
	ret = menelaus_write_reg(MENELAUS_GPIO_CTRL, ret);
out:
	mutex_unlock(&the_menelaus->lock);
	return ret;
}

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

/* Handles Menelaus interrupts. Does not run in interrupt context */
static void menelaus_work(struct work_struct *_menelaus)
{
	struct menelaus_chip *menelaus =
			container_of(_menelaus, struct menelaus_chip, work);
	void (*handler)(struct menelaus_chip *menelaus);

	while (1) {
		unsigned isr;

		isr = (menelaus_read_reg(MENELAUS_INT_STATUS2)
				& ~menelaus->mask2) << 8;
		isr |= menelaus_read_reg(MENELAUS_INT_STATUS1)
				& ~menelaus->mask1;
		if (!isr)
			break;

		while (isr) {
			int irq = fls(isr) - 1;
			isr &= ~(1 << irq);

			mutex_lock(&menelaus->lock);
			menelaus_disable_irq(irq);
			menelaus_ack_irq(irq);
			handler = menelaus->handlers[irq];
			if (handler)
				handler(menelaus);
			menelaus_enable_irq(irq);
			mutex_unlock(&menelaus->lock);
		}
	}
	enable_irq(menelaus->client->irq);
}

/*
 * We cannot use I2C in interrupt context, so we just schedule work.
 */
static irqreturn_t menelaus_irq(int irq, void *_menelaus)
{
	struct menelaus_chip *menelaus = _menelaus;

	disable_irq_nosync(irq);
	(void)schedule_work(&menelaus->work);

	return IRQ_HANDLED;
}

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

/*
 * The RTC needs to be set once, then it runs on backup battery power.
 * It supports alarms, including system wake alarms (from some modes);
 * and 1/second IRQs if requested.
 */
#ifdef CONFIG_RTC_DRV_TWL92330

#define RTC_CTRL_RTC_EN		(1 << 0)
#define RTC_CTRL_AL_EN		(1 << 1)
#define RTC_CTRL_MODE12		(1 << 2)
#define RTC_CTRL_EVERY_MASK	(3 << 3)
#define RTC_CTRL_EVERY_SEC	(0 << 3)
#define RTC_CTRL_EVERY_MIN	(1 << 3)
#define RTC_CTRL_EVERY_HR	(2 << 3)
#define RTC_CTRL_EVERY_DAY	(3 << 3)

#define RTC_UPDATE_EVERY	0x08

#define RTC_HR_PM		(1 << 7)

static void menelaus_to_time(char *regs, struct rtc_time *t)
{
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	t->tm_sec = bcd2bin(regs[0]);
	t->tm_min = bcd2bin(regs[1]);
837
	if (the_menelaus->rtc_control & RTC_CTRL_MODE12) {
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		t->tm_hour = bcd2bin(regs[2] & 0x1f) - 1;
839 840 841
		if (regs[2] & RTC_HR_PM)
			t->tm_hour += 12;
	} else
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		t->tm_hour = bcd2bin(regs[2] & 0x3f);
	t->tm_mday = bcd2bin(regs[3]);
	t->tm_mon = bcd2bin(regs[4]) - 1;
	t->tm_year = bcd2bin(regs[5]) + 100;
846 847 848 849 850 851
}

static int time_to_menelaus(struct rtc_time *t, int regnum)
{
	int	hour, status;

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	status = menelaus_write_reg(regnum++, bin2bcd(t->tm_sec));
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	if (status < 0)
		goto fail;

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	status = menelaus_write_reg(regnum++, bin2bcd(t->tm_min));
857 858 859 860 861 862
	if (status < 0)
		goto fail;

	if (the_menelaus->rtc_control & RTC_CTRL_MODE12) {
		hour = t->tm_hour + 1;
		if (hour > 12)
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			hour = RTC_HR_PM | bin2bcd(hour - 12);
864
		else
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			hour = bin2bcd(hour);
866
	} else
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		hour = bin2bcd(t->tm_hour);
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	status = menelaus_write_reg(regnum++, hour);
	if (status < 0)
		goto fail;

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	status = menelaus_write_reg(regnum++, bin2bcd(t->tm_mday));
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	if (status < 0)
		goto fail;

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	status = menelaus_write_reg(regnum++, bin2bcd(t->tm_mon + 1));
877 878 879
	if (status < 0)
		goto fail;

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	status = menelaus_write_reg(regnum++, bin2bcd(t->tm_year - 100));
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	if (status < 0)
		goto fail;

	return 0;
fail:
	dev_err(&the_menelaus->client->dev, "rtc write reg %02x, err %d\n",
			--regnum, status);
	return status;
}

static int menelaus_read_time(struct device *dev, struct rtc_time *t)
{
	struct i2c_msg	msg[2];
	char		regs[7];
	int		status;

	/* block read date and time registers */
	regs[0] = MENELAUS_RTC_SEC;

	msg[0].addr = MENELAUS_I2C_ADDRESS;
	msg[0].flags = 0;
	msg[0].len = 1;
	msg[0].buf = regs;

	msg[1].addr = MENELAUS_I2C_ADDRESS;
	msg[1].flags = I2C_M_RD;
	msg[1].len = sizeof(regs);
	msg[1].buf = regs;

	status = i2c_transfer(the_menelaus->client->adapter, msg, 2);
	if (status != 2) {
		dev_err(dev, "%s error %d\n", "read", status);
		return -EIO;
	}

	menelaus_to_time(regs, t);
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	t->tm_wday = bcd2bin(regs[6]);
918 919 920 921 922 923 924 925 926 927 928 929

	return 0;
}

static int menelaus_set_time(struct device *dev, struct rtc_time *t)
{
	int		status;

	/* write date and time registers */
	status = time_to_menelaus(t, MENELAUS_RTC_SEC);
	if (status < 0)
		return status;
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	status = menelaus_write_reg(MENELAUS_RTC_WKDAY, bin2bcd(t->tm_wday));
931
	if (status < 0) {
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		dev_err(&the_menelaus->client->dev, "rtc write reg %02x "
933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150
				"err %d\n", MENELAUS_RTC_WKDAY, status);
		return status;
	}

	/* now commit the write */
	status = menelaus_write_reg(MENELAUS_RTC_UPDATE, RTC_UPDATE_EVERY);
	if (status < 0)
		dev_err(&the_menelaus->client->dev, "rtc commit time, err %d\n",
				status);

	return 0;
}

static int menelaus_read_alarm(struct device *dev, struct rtc_wkalrm *w)
{
	struct i2c_msg	msg[2];
	char		regs[6];
	int		status;

	/* block read alarm registers */
	regs[0] = MENELAUS_RTC_AL_SEC;

	msg[0].addr = MENELAUS_I2C_ADDRESS;
	msg[0].flags = 0;
	msg[0].len = 1;
	msg[0].buf = regs;

	msg[1].addr = MENELAUS_I2C_ADDRESS;
	msg[1].flags = I2C_M_RD;
	msg[1].len = sizeof(regs);
	msg[1].buf = regs;

	status = i2c_transfer(the_menelaus->client->adapter, msg, 2);
	if (status != 2) {
		dev_err(dev, "%s error %d\n", "alarm read", status);
		return -EIO;
	}

	menelaus_to_time(regs, &w->time);

	w->enabled = !!(the_menelaus->rtc_control & RTC_CTRL_AL_EN);

	/* NOTE we *could* check if actually pending... */
	w->pending = 0;

	return 0;
}

static int menelaus_set_alarm(struct device *dev, struct rtc_wkalrm *w)
{
	int		status;

	if (the_menelaus->client->irq <= 0 && w->enabled)
		return -ENODEV;

	/* clear previous alarm enable */
	if (the_menelaus->rtc_control & RTC_CTRL_AL_EN) {
		the_menelaus->rtc_control &= ~RTC_CTRL_AL_EN;
		status = menelaus_write_reg(MENELAUS_RTC_CTRL,
				the_menelaus->rtc_control);
		if (status < 0)
			return status;
	}

	/* write alarm registers */
	status = time_to_menelaus(&w->time, MENELAUS_RTC_AL_SEC);
	if (status < 0)
		return status;

	/* enable alarm if requested */
	if (w->enabled) {
		the_menelaus->rtc_control |= RTC_CTRL_AL_EN;
		status = menelaus_write_reg(MENELAUS_RTC_CTRL,
				the_menelaus->rtc_control);
	}

	return status;
}

#ifdef CONFIG_RTC_INTF_DEV

static void menelaus_rtc_update_work(struct menelaus_chip *m)
{
	/* report 1/sec update */
	local_irq_disable();
	rtc_update_irq(m->rtc, 1, RTC_IRQF | RTC_UF);
	local_irq_enable();
}

static int menelaus_ioctl(struct device *dev, unsigned cmd, unsigned long arg)
{
	int	status;

	if (the_menelaus->client->irq <= 0)
		return -ENOIOCTLCMD;

	switch (cmd) {
	/* alarm IRQ */
	case RTC_AIE_ON:
		if (the_menelaus->rtc_control & RTC_CTRL_AL_EN)
			return 0;
		the_menelaus->rtc_control |= RTC_CTRL_AL_EN;
		break;
	case RTC_AIE_OFF:
		if (!(the_menelaus->rtc_control & RTC_CTRL_AL_EN))
			return 0;
		the_menelaus->rtc_control &= ~RTC_CTRL_AL_EN;
		break;
	/* 1/second "update" IRQ */
	case RTC_UIE_ON:
		if (the_menelaus->uie)
			return 0;
		status = menelaus_remove_irq_work(MENELAUS_RTCTMR_IRQ);
		status = menelaus_add_irq_work(MENELAUS_RTCTMR_IRQ,
				menelaus_rtc_update_work);
		if (status == 0)
			the_menelaus->uie = 1;
		return status;
	case RTC_UIE_OFF:
		if (!the_menelaus->uie)
			return 0;
		status = menelaus_remove_irq_work(MENELAUS_RTCTMR_IRQ);
		if (status == 0)
			the_menelaus->uie = 0;
		return status;
	default:
		return -ENOIOCTLCMD;
	}
	return menelaus_write_reg(MENELAUS_RTC_CTRL, the_menelaus->rtc_control);
}

#else
#define menelaus_ioctl	NULL
#endif

/* REVISIT no compensation register support ... */

static const struct rtc_class_ops menelaus_rtc_ops = {
	.ioctl			= menelaus_ioctl,
	.read_time		= menelaus_read_time,
	.set_time		= menelaus_set_time,
	.read_alarm		= menelaus_read_alarm,
	.set_alarm		= menelaus_set_alarm,
};

static void menelaus_rtc_alarm_work(struct menelaus_chip *m)
{
	/* report alarm */
	local_irq_disable();
	rtc_update_irq(m->rtc, 1, RTC_IRQF | RTC_AF);
	local_irq_enable();

	/* then disable it; alarms are oneshot */
	the_menelaus->rtc_control &= ~RTC_CTRL_AL_EN;
	menelaus_write_reg(MENELAUS_RTC_CTRL, the_menelaus->rtc_control);
}

static inline void menelaus_rtc_init(struct menelaus_chip *m)
{
	int	alarm = (m->client->irq > 0);

	/* assume 32KDETEN pin is pulled high */
	if (!(menelaus_read_reg(MENELAUS_OSC_CTRL) & 0x80)) {
		dev_dbg(&m->client->dev, "no 32k oscillator\n");
		return;
	}

	/* support RTC alarm; it can issue wakeups */
	if (alarm) {
		if (menelaus_add_irq_work(MENELAUS_RTCALM_IRQ,
				menelaus_rtc_alarm_work) < 0) {
			dev_err(&m->client->dev, "can't handle RTC alarm\n");
			return;
		}
		device_init_wakeup(&m->client->dev, 1);
	}

	/* be sure RTC is enabled; allow 1/sec irqs; leave 12hr mode alone */
	m->rtc_control = menelaus_read_reg(MENELAUS_RTC_CTRL);
	if (!(m->rtc_control & RTC_CTRL_RTC_EN)
			|| (m->rtc_control & RTC_CTRL_AL_EN)
			|| (m->rtc_control & RTC_CTRL_EVERY_MASK)) {
		if (!(m->rtc_control & RTC_CTRL_RTC_EN)) {
			dev_warn(&m->client->dev, "rtc clock needs setting\n");
			m->rtc_control |= RTC_CTRL_RTC_EN;
		}
		m->rtc_control &= ~RTC_CTRL_EVERY_MASK;
		m->rtc_control &= ~RTC_CTRL_AL_EN;
		menelaus_write_reg(MENELAUS_RTC_CTRL, m->rtc_control);
	}

	m->rtc = rtc_device_register(DRIVER_NAME,
			&m->client->dev,
			&menelaus_rtc_ops, THIS_MODULE);
	if (IS_ERR(m->rtc)) {
		if (alarm) {
			menelaus_remove_irq_work(MENELAUS_RTCALM_IRQ);
			device_init_wakeup(&m->client->dev, 0);
		}
		dev_err(&m->client->dev, "can't register RTC: %d\n",
				(int) PTR_ERR(m->rtc));
		the_menelaus->rtc = NULL;
	}
}

#else

static inline void menelaus_rtc_init(struct menelaus_chip *m)
{
	/* nothing */
}

#endif

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

static struct i2c_driver menelaus_i2c_driver;

1151 1152
static int menelaus_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177
{
	struct menelaus_chip	*menelaus;
	int			rev = 0, val;
	int			err = 0;
	struct menelaus_platform_data *menelaus_pdata =
					client->dev.platform_data;

	if (the_menelaus) {
		dev_dbg(&client->dev, "only one %s for now\n",
				DRIVER_NAME);
		return -ENODEV;
	}

	menelaus = kzalloc(sizeof *menelaus, GFP_KERNEL);
	if (!menelaus)
		return -ENOMEM;

	i2c_set_clientdata(client, menelaus);

	the_menelaus = menelaus;
	menelaus->client = client;

	/* If a true probe check the device */
	rev = menelaus_read_reg(MENELAUS_REV);
	if (rev < 0) {
1178
		pr_err(DRIVER_NAME ": device not found");
1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197
		err = -ENODEV;
		goto fail1;
	}

	/* Ack and disable all Menelaus interrupts */
	menelaus_write_reg(MENELAUS_INT_ACK1, 0xff);
	menelaus_write_reg(MENELAUS_INT_ACK2, 0xff);
	menelaus_write_reg(MENELAUS_INT_MASK1, 0xff);
	menelaus_write_reg(MENELAUS_INT_MASK2, 0xff);
	menelaus->mask1 = 0xff;
	menelaus->mask2 = 0xff;

	/* Set output buffer strengths */
	menelaus_write_reg(MENELAUS_MCT_CTRL1, 0x73);

	if (client->irq > 0) {
		err = request_irq(client->irq, menelaus_irq, IRQF_DISABLED,
				  DRIVER_NAME, menelaus);
		if (err) {
1198
			dev_dbg(&client->dev,  "can't get IRQ %d, err %d\n",
1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244
					client->irq, err);
			goto fail1;
		}
	}

	mutex_init(&menelaus->lock);
	INIT_WORK(&menelaus->work, menelaus_work);

	pr_info("Menelaus rev %d.%d\n", rev >> 4, rev & 0x0f);

	val = menelaus_read_reg(MENELAUS_VCORE_CTRL1);
	if (val < 0)
		goto fail2;
	if (val & (1 << 7))
		menelaus->vcore_hw_mode = 1;
	else
		menelaus->vcore_hw_mode = 0;

	if (menelaus_pdata != NULL && menelaus_pdata->late_init != NULL) {
		err = menelaus_pdata->late_init(&client->dev);
		if (err < 0)
			goto fail2;
	}

	menelaus_rtc_init(menelaus);

	return 0;
fail2:
	free_irq(client->irq, menelaus);
	flush_scheduled_work();
fail1:
	kfree(menelaus);
	return err;
}

static int __exit menelaus_remove(struct i2c_client *client)
{
	struct menelaus_chip	*menelaus = i2c_get_clientdata(client);

	free_irq(client->irq, menelaus);
	kfree(menelaus);
	i2c_set_clientdata(client, NULL);
	the_menelaus = NULL;
	return 0;
}

1245 1246 1247 1248 1249 1250
static const struct i2c_device_id menelaus_id[] = {
	{ "menelaus", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, menelaus_id);

1251 1252 1253 1254 1255 1256
static struct i2c_driver menelaus_i2c_driver = {
	.driver = {
		.name		= DRIVER_NAME,
	},
	.probe		= menelaus_probe,
	.remove		= __exit_p(menelaus_remove),
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	.id_table	= menelaus_id,
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};

static int __init menelaus_init(void)
{
	int res;

	res = i2c_add_driver(&menelaus_i2c_driver);
	if (res < 0) {
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		pr_err(DRIVER_NAME ": driver registration failed\n");
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		return res;
	}

	return 0;
}

static void __exit menelaus_exit(void)
{
	i2c_del_driver(&menelaus_i2c_driver);

	/* FIXME: Shutdown menelaus parts that can be shut down */
}

MODULE_AUTHOR("Texas Instruments, Inc. (and others)");
MODULE_DESCRIPTION("I2C interface for Menelaus.");
MODULE_LICENSE("GPL");

module_init(menelaus_init);
module_exit(menelaus_exit);