diff options
Diffstat (limited to 'drivers/input/misc/ab8500-accdet.c')
-rw-r--r-- | drivers/input/misc/ab8500-accdet.c | 464 |
1 files changed, 464 insertions, 0 deletions
diff --git a/drivers/input/misc/ab8500-accdet.c b/drivers/input/misc/ab8500-accdet.c new file mode 100644 index 00000000000..1b96b6b3fef --- /dev/null +++ b/drivers/input/misc/ab8500-accdet.c @@ -0,0 +1,464 @@ +/* + * 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/delay.h> +#include <linux/interrupt.h> +#include <linux/mfd/abx500.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/mfd/abx500/ab8500-gpadc.h> +#include <linux/mfd/abx500/ab8500-gpio.h> +#include <linux/gpio.h> +#include <linux/err.h> +#include <linux/input/abx500-accdet.h> +#ifdef CONFIG_SND_SOC_UX500_AB8500 +#include <sound/ux500_ab8500_ext.h> +#endif + +#define MAX_DET_COUNT 10 +#define MAX_VOLT_DIFF 30 +#define MIN_MIC_POWER -100 + +/* Unique value used to identify Headset button input device */ +#define BTN_INPUT_UNIQUE_VALUE "AB8500HsBtn" +#define BTN_INPUT_DEV_NAME "AB8500 Hs Button" + +#define DEBOUNCE_PLUG_EVENT_MS 100 +#define DEBOUNCE_PLUG_RETEST_MS 25 +#define DEBOUNCE_UNPLUG_EVENT_MS 0 + +/* + * Register definition for accessory detection. + */ +#define AB8500_REGU_CTRL1_SPARE_REG 0x84 +#define AB8500_ACC_DET_DB1_REG 0x80 +#define AB8500_ACC_DET_DB2_REG 0x81 +#define AB8500_ACC_DET_CTRL_REG 0x82 +#define AB8500_IT_SOURCE5_REG 0x04 + +/* 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 0x04 + +/* After being loaded, how fast the first check is to be made */ +#define INIT_DELAY_MS 3000 + +/* Voltage limits (mV) for various types of AV Accessories */ +#define ACCESSORY_DET_VOL_DONTCARE -1 +#define ACCESSORY_HEADPHONE_DET_VOL_MIN 0 +#define ACCESSORY_HEADPHONE_DET_VOL_MAX 40 +#define ACCESSORY_CARKIT_DET_VOL_MIN 1100 +#define ACCESSORY_CARKIT_DET_VOL_MAX 1300 +#define ACCESSORY_HEADSET_DET_VOL_MIN 0 +#define ACCESSORY_HEADSET_DET_VOL_MAX 200 +#define ACCESSORY_OPENCABLE_DET_VOL_MIN 1730 +#define ACCESSORY_OPENCABLE_DET_VOL_MAX 2150 + +/* Static data initialization */ + +static struct accessory_regu_descriptor ab8500_regu_desc[3] = { + { + .id = REGULATOR_VAUDIO, + .name = "v-audio", + }, + { + .id = REGULATOR_VAMIC1, + .name = "v-amic1", + }, + { + .id = REGULATOR_AVSWITCH, + .name = "vcc-N2158", + }, +}; + +static struct accessory_irq_descriptor ab8500_irq_desc_norm[] = { + { + .irq = PLUG_IRQ, + .name = "ACC_DETECT_1DB_F", + .isr = plug_irq_handler, + }, + { + .irq = UNPLUG_IRQ, + .name = "ACC_DETECT_1DB_R", + .isr = unplug_irq_handler, + }, + { + .irq = BUTTON_PRESS_IRQ, + .name = "ACC_DETECT_22DB_F", + .isr = button_press_irq_handler, + }, + { + .irq = BUTTON_RELEASE_IRQ, + .name = "ACC_DETECT_22DB_R", + .isr = button_release_irq_handler, + }, +}; + +static struct accessory_irq_descriptor ab8500_irq_desc_inverted[] = { + { + .irq = PLUG_IRQ, + .name = "ACC_DETECT_1DB_R", + .isr = plug_irq_handler, + }, + { + .irq = UNPLUG_IRQ, + .name = "ACC_DETECT_1DB_F", + .isr = unplug_irq_handler, + }, + { + .irq = BUTTON_PRESS_IRQ, + .name = "ACC_DETECT_22DB_R", + .isr = button_press_irq_handler, + }, + { + .irq = BUTTON_RELEASE_IRQ, + .name = "ACC_DETECT_22DB_F", + .isr = button_release_irq_handler, + }, +}; + +/* + * configures accdet2 input on/off + */ +static void ab8500_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, + AB8500_ECI_AV_ACC, + AB8500_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, + AB8500_ECI_AV_ACC, + AB8500_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 ab8500_config_accdetect1_hw(struct abx500_ad *dd, int enable) +{ + int ret; + + if (!dd->accdet1_th_set) { + ret = abx500_set_register_interruptible(&dd->pdev->dev, + AB8500_ECI_AV_ACC, + AB8500_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, + AB8500_ECI_AV_ACC, + AB8500_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 ab8500_detect_plugged_in(struct abx500_ad *dd) +{ + u8 value = 0; + + int status = abx500_get_register_interruptible( + &dd->pdev->dev, + AB8500_INTERRUPT, + AB8500_IT_SOURCE5_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; +} + +#ifdef CONFIG_SND_SOC_UX500_AB8500 + +/* + * meas_voltage_stable - measures relative stable voltage from spec. input + */ +static int ab8500_meas_voltage_stable(struct abx500_ad *dd) +{ + int ret, mv; + + ret = ux500_ab8500_audio_gpadc_measure((struct ab8500_gpadc *)dd->gpadc, + ACC_DETECT2, false, &mv); + + return (ret < 0) ? ret : mv; +} + +/* + * meas_alt_voltage_stable - measures relative stable voltage from spec. input + */ +static int ab8500_meas_alt_voltage_stable(struct abx500_ad *dd) +{ + int ret, mv; + + ret = ux500_ab8500_audio_gpadc_measure((struct ab8500_gpadc *)dd->gpadc, + ACC_DETECT2, true, &mv); + + return (ret < 0) ? ret : mv; +} + +#else + +/* + * meas_voltage_stable - measures relative stable voltage from spec. input + */ +static int ab8500_meas_voltage_stable(struct abx500_ad *dd) +{ + int iterations = 2; + int v1, v2, dv; + + v1 = ab8500_gpadc_convert((struct ab8500_gpadc *)dd->gpadc, + ACC_DETECT2); + do { + msleep(1); + --iterations; + v2 = ab8500_gpadc_convert((struct ab8500_gpadc *)dd->gpadc, + ACC_DETECT2); + dv = abs(v2 - v1); + v1 = v2; + } while (iterations > 0 && dv > MAX_VOLT_DIFF); + + return v1; +} + +/* + * not implemented for non soc setups + */ +static int ab8500_meas_alt_voltage_stable(struct abx500_ad *dd) +{ + return -1; +} + +#endif + +/* + * configures HW so that it is possible to make decision whether + * accessory is connected or not. + */ +static void ab8500_config_hw_test_plug_connected(struct abx500_ad *dd, + int enable) +{ + int ret; + + dev_dbg(&dd->pdev->dev, "%s:%d\n", __func__, enable); + + ret = ab8500_config_pulldown(&dd->pdev->dev, + dd->pdata->video_ctrl_gpio, !enable); + if (ret < 0) { + dev_err(&dd->pdev->dev, + "%s: Failed to update reg (%d).\n", __func__, ret); + return; + } + + if (enable) + accessory_regulator_enable(dd, REGULATOR_VAMIC1); +} + +/* + * configures HW so that carkit/headset detection can be accomplished. + */ +static void ab8500_config_hw_test_basic_carkit(struct abx500_ad *dd, int enable) +{ + int ret; + + dev_dbg(&dd->pdev->dev, "%s:%d\n", __func__, enable); + + if (enable) + accessory_regulator_disable(dd, REGULATOR_VAMIC1); + + /* Un-Ground the VAMic1 output when enabled */ + ret = abx500_mask_and_set_register_interruptible( + &dd->pdev->dev, + AB8500_REGU_CTRL1, + AB8500_REGU_CTRL1_SPARE_REG, + BIT_REGUCTRL1SPARE_VAMIC1_GROUND, + enable ? BIT_REGUCTRL1SPARE_VAMIC1_GROUND : 0); + if (ret < 0) + dev_err(&dd->pdev->dev, + "%s: Failed to update reg (%d).\n", __func__, ret); +} + +/* + * sets the av switch direction - audio-in vs video-out + */ +static void ab8500_set_av_switch(struct abx500_ad *dd, + enum accessory_avcontrol_dir dir) +{ + int ret; + + dev_dbg(&dd->pdev->dev, "%s: Enter (%d)\n", __func__, dir); + if (dir == NOT_SET) { + ret = gpio_direction_input(dd->pdata->video_ctrl_gpio); + dd->gpio35_dir_set = 0; + ret = gpio_direction_output(dd->pdata->video_ctrl_gpio, 0); + if (dd->pdata->mic_ctrl) + gpio_direction_output(dd->pdata->mic_ctrl, 0); + } else if (!dd->gpio35_dir_set) { + ret = gpio_direction_output(dd->pdata->video_ctrl_gpio, + dir == AUDIO_IN ? 1 : 0); + if (ret < 0) { + dev_err(&dd->pdev->dev, + "%s: video_ctrl pin output config failed (%d).\n", + __func__, ret); + return; + } + + if (dd->pdata->mic_ctrl) { + ret = gpio_direction_output(dd->pdata->mic_ctrl, + dir == AUDIO_IN ? 1 : 0); + if (ret < 0) { + dev_err(&dd->pdev->dev, + "%s: mic_ctrl pin output" + "config failed (%d).\n", + __func__, ret); + return; + } + } + + dd->gpio35_dir_set = 1; + dev_dbg(&dd->pdev->dev, "AV-SWITCH: %s\n", + dir == AUDIO_IN ? "AUDIO_IN" : "VIDEO_OUT"); + } else { + gpio_set_value(dd->pdata->video_ctrl_gpio, + dir == AUDIO_IN ? 1 : 0); + } +} + +static u8 acc_det_ctrl_suspend_val; + +static void ab8500_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, + AB8500_ECI_AV_ACC, + AB8500_ACC_DET_CTRL_REG, + &acc_det_ctrl_suspend_val); + (void) abx500_set_register_interruptible( + &dd->pdev->dev, + AB8500_ECI_AV_ACC, + AB8500_ACC_DET_CTRL_REG, + 0); + +} + +static void ab8500_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, + AB8500_ECI_AV_ACC, + AB8500_ACC_DET_CTRL_REG, + acc_det_ctrl_suspend_val); + +} + +static void *ab8500_accdet_abx500_gpadc_get(void) +{ + return ab8500_gpadc_get("ab8500-gpadc.0"); +} + +struct abx500_accdet_platform_data * + ab8500_get_platform_data(struct platform_device *pdev) +{ + struct ab8500_platform_data *plat; + + plat = dev_get_platdata(pdev->dev.parent); + + if (!plat || !plat->accdet) { + dev_err(&pdev->dev, "%s: Failed to get accdet plat data.\n", + __func__); + return ERR_PTR(-ENODEV); + } + + return plat->accdet; +} + +struct abx500_ad ab8500_accessory_det_callbacks = { + .irq_desc_norm = ab8500_irq_desc_norm, + .irq_desc_inverted = ab8500_irq_desc_inverted, + .no_irqs = ARRAY_SIZE(ab8500_irq_desc_norm), + .regu_desc = ab8500_regu_desc, + .no_of_regu_desc = ARRAY_SIZE(ab8500_regu_desc), + .config_accdetect2_hw = ab8500_config_accdetect2_hw, + .config_accdetect1_hw = ab8500_config_accdetect1_hw, + .detect_plugged_in = ab8500_detect_plugged_in, + .meas_voltage_stable = ab8500_meas_voltage_stable, + .meas_alt_voltage_stable = ab8500_meas_alt_voltage_stable, + .config_hw_test_basic_carkit = ab8500_config_hw_test_basic_carkit, + .turn_off_accdet_comparator = ab8500_turn_off_accdet_comparator, + .turn_on_accdet_comparator = ab8500_turn_on_accdet_comparator, + .accdet_abx500_gpadc_get = ab8500_accdet_abx500_gpadc_get, + .config_hw_test_plug_connected = ab8500_config_hw_test_plug_connected, + .set_av_switch = ab8500_set_av_switch, + .get_platform_data = ab8500_get_platform_data, +}; + +MODULE_DESCRIPTION("AB8500 AV Accessory detection driver"); +MODULE_ALIAS("platform:ab8500-acc-det"); +MODULE_AUTHOR("ST-Ericsson"); +MODULE_LICENSE("GPL v2"); |