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/*
* Copyright (C) ST-Ericsson SA 2010
*
* Author: Jarmo K. Kuronen <jarmo.kuronen@symbio.com>
* for ST-Ericsson.
*
* License terms: GPL V2
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/mfd/abx500/ab5500.h>
#include <linux/mfd/abx500/ab5500-gpadc.h>
#include <linux/mfd/abx500.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/input/abx500-accdet.h>
/*
* Register definition for accessory detection.
*/
#define AB5500_REGU_CTRL1_SPARE_REG 0x84
#define AB5500_ACC_DET_DB1_REG 0x20
#define AB5500_ACC_DET_DB2_REG 0x21
#define AB5500_ACC_DET_CTRL_REG 0x23
#define AB5500_VDENC_CTRL0 0x80
/* REGISTER: AB8500_ACC_DET_CTRL_REG */
#define BITS_ACCDETCTRL2_ENA (0x20 | 0x10 | 0x08)
#define BITS_ACCDETCTRL1_ENA (0x02 | 0x01)
/* REGISTER: AB8500_REGU_CTRL1_SPARE_REG */
#define BIT_REGUCTRL1SPARE_VAMIC1_GROUND 0x01
/* REGISTER: AB8500_IT_SOURCE5_REG */
#define BIT_ITSOURCE5_ACCDET1 0x02
static struct accessory_irq_descriptor ab5500_irq_desc[] = {
{
.irq = PLUG_IRQ,
.name = "acc_detedt1db_falling",
.isr = plug_irq_handler,
},
{
.irq = UNPLUG_IRQ,
.name = "acc_detedt1db_rising",
.isr = unplug_irq_handler,
},
{
.irq = BUTTON_PRESS_IRQ,
.name = "acc_detedt21db_falling",
.isr = button_press_irq_handler,
},
{
.irq = BUTTON_RELEASE_IRQ,
.name = "acc_detedt21db_rising",
.isr = button_release_irq_handler,
},
};
static struct accessory_regu_descriptor ab5500_regu_desc[] = {
{
.id = REGULATOR_VAMIC1,
.name = "v-amic",
},
};
/*
* configures accdet2 input on/off
*/
static void ab5500_config_accdetect2_hw(struct abx500_ad *dd, int enable)
{
int ret = 0;
if (!dd->accdet2_th_set) {
/* Configure accdetect21+22 thresholds */
ret = abx500_set_register_interruptible(&dd->pdev->dev,
AB5500_BANK_FG_BATTCOM_ACC,
AB5500_ACC_DET_DB2_REG,
dd->pdata->accdet2122_th);
if (ret < 0) {
dev_err(&dd->pdev->dev,
"%s: Failed to write reg (%d).\n", __func__,
ret);
goto out;
} else {
dd->accdet2_th_set = 1;
}
}
/* Enable/Disable accdetect21 comparators + pullup */
ret = abx500_mask_and_set_register_interruptible(
&dd->pdev->dev,
AB5500_BANK_FG_BATTCOM_ACC,
AB5500_ACC_DET_CTRL_REG,
BITS_ACCDETCTRL2_ENA,
enable ? BITS_ACCDETCTRL2_ENA : 0);
if (ret < 0)
dev_err(&dd->pdev->dev, "%s: Failed to update reg (%d).\n",
__func__, ret);
out:
return;
}
/*
* configures accdet1 input on/off
*/
static void ab5500_config_accdetect1_hw(struct abx500_ad *dd, int enable)
{
int ret;
if (!dd->accdet1_th_set) {
ret = abx500_set_register_interruptible(&dd->pdev->dev,
AB5500_BANK_FG_BATTCOM_ACC,
AB5500_ACC_DET_DB1_REG,
dd->pdata->accdet1_dbth);
if (ret < 0)
dev_err(&dd->pdev->dev,
"%s: Failed to write reg (%d).\n", __func__,
ret);
else
dd->accdet1_th_set = 1;
}
/* enable accdetect1 comparator */
ret = abx500_mask_and_set_register_interruptible(
&dd->pdev->dev,
AB5500_BANK_FG_BATTCOM_ACC,
AB5500_ACC_DET_CTRL_REG,
BITS_ACCDETCTRL1_ENA,
enable ? BITS_ACCDETCTRL1_ENA : 0);
if (ret < 0)
dev_err(&dd->pdev->dev,
"%s: Failed to update reg (%d).\n", __func__, ret);
}
/*
* returns the high level status whether some accessory is connected (1|0).
*/
static int ab5500_detect_plugged_in(struct abx500_ad *dd)
{
u8 value = 0;
int status = abx500_get_register_interruptible(
&dd->pdev->dev,
AB5500_BANK_IT,
AB5500_IT_SOURCE3_REG,
&value);
if (status < 0) {
dev_err(&dd->pdev->dev, "%s: reg read failed (%d).\n",
__func__, status);
return 0;
}
if (dd->pdata->is_detection_inverted)
return value & BIT_ITSOURCE5_ACCDET1 ? 1 : 0;
else
return value & BIT_ITSOURCE5_ACCDET1 ? 0 : 1;
}
/*
* mic_line_voltage_stable - measures a relative stable voltage from spec. input
*/
static int ab5500_meas_voltage_stable(struct abx500_ad *dd)
{
int iterations = 2;
int v1, v2, dv;
v1 = ab5500_gpadc_convert((struct ab5500_gpadc *)dd->gpadc,
ACC_DETECT2);
do {
msleep(1);
--iterations;
v2 = ab5500_gpadc_convert((struct ab5500_gpadc *)dd->gpadc,
ACC_DETECT2);
dv = abs(v2 - v1);
v1 = v2;
} while (iterations > 0 && dv > MAX_VOLT_DIFF);
return v1;
}
/*
* not implemented
*/
static int ab5500_meas_alt_voltage_stable(struct abx500_ad *dd)
{
return -1;
}
/*
* configures HW so that it is possible to make decision whether
* accessory is connected or not.
*/
static void ab5500_config_hw_test_plug_connected(struct abx500_ad *dd,
int enable)
{
dev_dbg(&dd->pdev->dev, "%s:%d\n", __func__, enable);
/* enable mic BIAS2 */
if (enable)
accessory_regulator_enable(dd, REGULATOR_VAMIC1);
}
/*
* configures HW so that carkit/headset detection can be accomplished.
*/
static void ab5500_config_hw_test_basic_carkit(struct abx500_ad *dd, int enable)
{
/* enable mic BIAS2 */
if (enable)
accessory_regulator_disable(dd, REGULATOR_VAMIC1);
}
static u8 acc_det_ctrl_suspend_val;
static void ab5500_turn_off_accdet_comparator(struct platform_device *pdev)
{
struct abx500_ad *dd = platform_get_drvdata(pdev);
/* Turn off AccDetect comparators and pull-up */
(void) abx500_get_register_interruptible(
&dd->pdev->dev,
AB5500_BANK_FG_BATTCOM_ACC,
AB5500_ACC_DET_CTRL_REG,
&acc_det_ctrl_suspend_val);
(void) abx500_set_register_interruptible(
&dd->pdev->dev,
AB5500_BANK_FG_BATTCOM_ACC,
AB5500_ACC_DET_CTRL_REG,
0);
}
static void ab5500_turn_on_accdet_comparator(struct platform_device *pdev)
{
struct abx500_ad *dd = platform_get_drvdata(pdev);
/* Turn on AccDetect comparators and pull-up */
(void) abx500_set_register_interruptible(
&dd->pdev->dev,
AB5500_BANK_FG_BATTCOM_ACC,
AB5500_ACC_DET_CTRL_REG,
acc_det_ctrl_suspend_val);
}
static void *ab5500_accdet_abx500_gpadc_get(void)
{
return ab5500_gpadc_get("ab5500-adc.0");
}
struct abx500_accdet_platform_data *
ab5500_get_platform_data(struct platform_device *pdev)
{
return pdev->dev.platform_data;
}
struct abx500_ad ab5500_accessory_det_callbacks = {
.irq_desc_norm = ab5500_irq_desc,
.irq_desc_inverted = NULL,
.no_irqs = ARRAY_SIZE(ab5500_irq_desc),
.regu_desc = ab5500_regu_desc,
.no_of_regu_desc = ARRAY_SIZE(ab5500_regu_desc),
.config_accdetect2_hw = ab5500_config_accdetect2_hw,
.config_accdetect1_hw = ab5500_config_accdetect1_hw,
.detect_plugged_in = ab5500_detect_plugged_in,
.meas_voltage_stable = ab5500_meas_voltage_stable,
.meas_alt_voltage_stable = ab5500_meas_alt_voltage_stable,
.config_hw_test_basic_carkit = ab5500_config_hw_test_basic_carkit,
.turn_off_accdet_comparator = ab5500_turn_off_accdet_comparator,
.turn_on_accdet_comparator = ab5500_turn_on_accdet_comparator,
.accdet_abx500_gpadc_get = ab5500_accdet_abx500_gpadc_get,
.config_hw_test_plug_connected = ab5500_config_hw_test_plug_connected,
.set_av_switch = NULL,
.get_platform_data = ab5500_get_platform_data,
};
MODULE_LICENSE("GPL v2");
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