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Release 4.11 drivers/staging/iio/cdc/ad7150.c

/*
 * AD7150 capacitive sensor driver supporting AD7150/1/6
 *
 * Copyright 2010-2011 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/module.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
/*
 * AD7150 registers definition
 */


#define AD7150_STATUS              0

#define AD7150_STATUS_OUT1         BIT(3)

#define AD7150_STATUS_OUT2         BIT(5)

#define AD7150_CH1_DATA_HIGH       1

#define AD7150_CH2_DATA_HIGH       3

#define AD7150_CH1_AVG_HIGH        5

#define AD7150_CH2_AVG_HIGH        7

#define AD7150_CH1_SENSITIVITY     9

#define AD7150_CH1_THR_HOLD_H      9

#define AD7150_CH1_TIMEOUT         10

#define AD7150_CH1_SETUP           11

#define AD7150_CH2_SENSITIVITY     12

#define AD7150_CH2_THR_HOLD_H      12

#define AD7150_CH2_TIMEOUT         13

#define AD7150_CH2_SETUP           14

#define AD7150_CFG                 15

#define AD7150_CFG_FIX             BIT(7)

#define AD7150_PD_TIMER            16

#define AD7150_CH1_CAPDAC          17

#define AD7150_CH2_CAPDAC          18

#define AD7150_SN3                 19

#define AD7150_SN2                 20

#define AD7150_SN1                 21

#define AD7150_SN0                 22

#define AD7150_ID                  23

/**
 * struct ad7150_chip_info - instance specific chip data
 * @client: i2c client for this device
 * @current_event: device always has one type of event enabled.
 *      This element stores the event code of the current one.
 * @threshold: thresholds for simple capacitance value events
 * @thresh_sensitivity: threshold for simple capacitance offset
 *      from 'average' value.
 * @mag_sensitity: threshold for magnitude of capacitance offset from
 *      from 'average' value.
 * @thresh_timeout: a timeout, in samples from the moment an
 *      adaptive threshold event occurs to when the average
 *      value jumps to current value.
 * @mag_timeout: a timeout, in sample from the moment an
 *      adaptive magnitude event occurs to when the average
 *      value jumps to the current value.
 * @old_state: store state from previous event, allowing confirmation
 *      of new condition.
 * @conversion_mode: the current conversion mode.
 * @state_lock: ensure consistent state of this structure wrt the
 *      hardware.
 */

struct ad7150_chip_info {
	
struct i2c_client *client;
	
u64 current_event;
	
u16 threshold[2][2];
	
u8 thresh_sensitivity[2][2];
	
u8 mag_sensitivity[2][2];
	
u8 thresh_timeout[2][2];
	
u8 mag_timeout[2][2];
	
int old_state;
	
char *conversion_mode;
	
struct mutex state_lock;
};

/*
 * sysfs nodes
 */


static const u8 ad7150_addresses[][6] = {
	{ AD7150_CH1_DATA_HIGH, AD7150_CH1_AVG_HIGH,
	  AD7150_CH1_SETUP, AD7150_CH1_THR_HOLD_H,
	  AD7150_CH1_SENSITIVITY, AD7150_CH1_TIMEOUT },
	{ AD7150_CH2_DATA_HIGH, AD7150_CH2_AVG_HIGH,
	  AD7150_CH2_SETUP, AD7150_CH2_THR_HOLD_H,
	  AD7150_CH2_SENSITIVITY, AD7150_CH2_TIMEOUT },
};


static int ad7150_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { int ret; struct ad7150_chip_info *chip = iio_priv(indio_dev); switch (mask) { case IIO_CHAN_INFO_RAW: ret = i2c_smbus_read_word_data(chip->client, ad7150_addresses[chan->channel][0]); if (ret < 0) return ret; *val = swab16(ret); return IIO_VAL_INT; case IIO_CHAN_INFO_AVERAGE_RAW: ret = i2c_smbus_read_word_data(chip->client, ad7150_addresses[chan->channel][1]); if (ret < 0) return ret; *val = swab16(ret); return IIO_VAL_INT; default: return -EINVAL; } }

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Jonathan Cameron11181.62%480.00%
Barry Song2518.38%120.00%
Total136100.00%5100.00%


static int ad7150_read_event_config(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir) { int ret; u8 threshtype; bool adaptive; struct ad7150_chip_info *chip = iio_priv(indio_dev); ret = i2c_smbus_read_byte_data(chip->client, AD7150_CFG); if (ret < 0) return ret; threshtype = (ret >> 5) & 0x03; adaptive = !!(ret & 0x80); switch (type) { case IIO_EV_TYPE_MAG_ADAPTIVE: if (dir == IIO_EV_DIR_RISING) return adaptive && (threshtype == 0x1); return adaptive && (threshtype == 0x0); case IIO_EV_TYPE_THRESH_ADAPTIVE: if (dir == IIO_EV_DIR_RISING) return adaptive && (threshtype == 0x3); return adaptive && (threshtype == 0x2); case IIO_EV_TYPE_THRESH: if (dir == IIO_EV_DIR_RISING) return !adaptive && (threshtype == 0x1); return !adaptive && (threshtype == 0x0); default: break; } return -EINVAL; }

Contributors

PersonTokensPropCommitsCommitProp
Jonathan Cameron11664.80%250.00%
Barry Song3821.23%125.00%
Lars-Peter Clausen2513.97%125.00%
Total179100.00%4100.00%

/* lock should be held */
static int ad7150_write_event_params(struct iio_dev *indio_dev, unsigned int chan, enum iio_event_type type, enum iio_event_direction dir) { int ret; u16 value; u8 sens, timeout; struct ad7150_chip_info *chip = iio_priv(indio_dev); int rising = (dir == IIO_EV_DIR_RISING); u64 event_code; event_code = IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE, chan, type, dir); if (event_code != chip->current_event) return 0; switch (type) { /* Note completely different from the adaptive versions */ case IIO_EV_TYPE_THRESH: value = chip->threshold[rising][chan]; return i2c_smbus_write_word_data(chip->client, ad7150_addresses[chan][3], swab16(value)); case IIO_EV_TYPE_MAG_ADAPTIVE: sens = chip->mag_sensitivity[rising][chan]; timeout = chip->mag_timeout[rising][chan]; break; case IIO_EV_TYPE_THRESH_ADAPTIVE: sens = chip->thresh_sensitivity[rising][chan]; timeout = chip->thresh_timeout[rising][chan]; break; default: return -EINVAL; } ret = i2c_smbus_write_byte_data(chip->client, ad7150_addresses[chan][4], sens); if (ret < 0) return ret; ret = i2c_smbus_write_byte_data(chip->client, ad7150_addresses[chan][5], timeout); if (ret < 0) return ret; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jonathan Cameron17270.78%240.00%
Barry Song4116.87%120.00%
Lars-Peter Clausen2911.93%120.00%
Ioana Ciornei10.41%120.00%
Total243100.00%5100.00%


static int ad7150_write_event_config(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir, int state) { u8 thresh_type, cfg, adaptive; int ret; struct ad7150_chip_info *chip = iio_priv(indio_dev); int rising = (dir == IIO_EV_DIR_RISING); u64 event_code; /* Something must always be turned on */ if (!state) return -EINVAL; event_code = IIO_UNMOD_EVENT_CODE(chan->type, chan->channel, type, dir); if (event_code == chip->current_event) return 0; mutex_lock(&chip->state_lock); ret = i2c_smbus_read_byte_data(chip->client, AD7150_CFG); if (ret < 0) goto error_ret; cfg = ret & ~((0x03 << 5) | (0x1 << 7)); switch (type) { case IIO_EV_TYPE_MAG_ADAPTIVE: adaptive = 1; if (rising) thresh_type = 0x1; else thresh_type = 0x0; break; case IIO_EV_TYPE_THRESH_ADAPTIVE: adaptive = 1; if (rising) thresh_type = 0x3; else thresh_type = 0x2; break; case IIO_EV_TYPE_THRESH: adaptive = 0; if (rising) thresh_type = 0x1; else thresh_type = 0x0; break; default: ret = -EINVAL; goto error_ret; } cfg |= (!adaptive << 7) | (thresh_type << 5); ret = i2c_smbus_write_byte_data(chip->client, AD7150_CFG, cfg); if (ret < 0) goto error_ret; chip->current_event = event_code; /* update control attributes */ ret = ad7150_write_event_params(indio_dev, chan->channel, type, dir); error_ret: mutex_unlock(&chip->state_lock); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jonathan Cameron20669.83%233.33%
Barry Song4515.25%116.67%
Lars-Peter Clausen4214.24%116.67%
Cristina Moraru10.34%116.67%
Pan Bian10.34%116.67%
Total295100.00%6100.00%


static int ad7150_read_event_value(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir, enum iio_event_info info, int *val, int *val2) { struct ad7150_chip_info *chip = iio_priv(indio_dev); int rising = (dir == IIO_EV_DIR_RISING); /* Complex register sharing going on here */ switch (type) { case IIO_EV_TYPE_MAG_ADAPTIVE: *val = chip->mag_sensitivity[rising][chan->channel]; return IIO_VAL_INT; case IIO_EV_TYPE_THRESH_ADAPTIVE: *val = chip->thresh_sensitivity[rising][chan->channel]; return IIO_VAL_INT; case IIO_EV_TYPE_THRESH: *val = chip->threshold[rising][chan->channel]; return IIO_VAL_INT; default: return -EINVAL; } }

Contributors

PersonTokensPropCommitsCommitProp
Jonathan Cameron6650.38%250.00%
Barry Song3325.19%125.00%
Lars-Peter Clausen3224.43%125.00%
Total131100.00%4100.00%


static int ad7150_write_event_value(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir, enum iio_event_info info, int val, int val2) { int ret; struct ad7150_chip_info *chip = iio_priv(indio_dev); int rising = (dir == IIO_EV_DIR_RISING); mutex_lock(&chip->state_lock); switch (type) { case IIO_EV_TYPE_MAG_ADAPTIVE: chip->mag_sensitivity[rising][chan->channel] = val; break; case IIO_EV_TYPE_THRESH_ADAPTIVE: chip->thresh_sensitivity[rising][chan->channel] = val; break; case IIO_EV_TYPE_THRESH: chip->threshold[rising][chan->channel] = val; break; default: ret = -EINVAL; goto error_ret; } /* write back if active */ ret = ad7150_write_event_params(indio_dev, chan->channel, type, dir); error_ret: mutex_unlock(&chip->state_lock); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jonathan Cameron9256.44%240.00%
Lars-Peter Clausen3521.47%120.00%
Barry Song3420.86%120.00%
Dan Carpenter21.23%120.00%
Total163100.00%5100.00%


static ssize_t ad7150_show_timeout(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *indio_dev = dev_to_iio_dev(dev); struct ad7150_chip_info *chip = iio_priv(indio_dev); struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); u8 value; /* use the event code for consistency reasons */ int chan = IIO_EVENT_CODE_EXTRACT_CHAN(this_attr->address); int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(this_attr->address) == IIO_EV_DIR_RISING); switch (IIO_EVENT_CODE_EXTRACT_TYPE(this_attr->address)) { case IIO_EV_TYPE_MAG_ADAPTIVE: value = chip->mag_timeout[rising][chan]; break; case IIO_EV_TYPE_THRESH_ADAPTIVE: value = chip->thresh_timeout[rising][chan]; break; default: return -EINVAL; } return sprintf(buf, "%d\n", value); }

Contributors

PersonTokensPropCommitsCommitProp
Jonathan Cameron9568.84%350.00%
Barry Song4129.71%116.67%
Lars-Peter Clausen21.45%233.33%
Total138100.00%6100.00%


static ssize_t ad7150_store_timeout(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct iio_dev *indio_dev = dev_to_iio_dev(dev); struct ad7150_chip_info *chip = iio_priv(indio_dev); struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); int chan = IIO_EVENT_CODE_EXTRACT_CHAN(this_attr->address); enum iio_event_direction dir; enum iio_event_type type; int rising; u8 data; int ret; type = IIO_EVENT_CODE_EXTRACT_TYPE(this_attr->address); dir = IIO_EVENT_CODE_EXTRACT_DIR(this_attr->address); rising = (dir == IIO_EV_DIR_RISING); ret = kstrtou8(buf, 10, &data); if (ret < 0) return ret; mutex_lock(&chip->state_lock); switch (type) { case IIO_EV_TYPE_MAG_ADAPTIVE: chip->mag_timeout[rising][chan] = data; break; case IIO_EV_TYPE_THRESH_ADAPTIVE: chip->thresh_timeout[rising][chan] = data; break; default: ret = -EINVAL; goto error_ret; } ret = ad7150_write_event_params(indio_dev, chan, type, dir); error_ret: mutex_unlock(&chip->state_lock); if (ret < 0) return ret; return len; }

Contributors

PersonTokensPropCommitsCommitProp
Jonathan Cameron14064.22%233.33%
Lars-Peter Clausen4018.35%350.00%
Barry Song3817.43%116.67%
Total218100.00%6100.00%

#define AD7150_TIMEOUT(chan, type, dir, ev_type, ev_dir) \ IIO_DEVICE_ATTR(in_capacitance##chan##_##type##_##dir##_timeout, \ 0644, \ &ad7150_show_timeout, \ &ad7150_store_timeout, \ IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE, \ chan, \ IIO_EV_TYPE_##ev_type, \ IIO_EV_DIR_##ev_dir)) static AD7150_TIMEOUT(0, mag_adaptive, rising, MAG_ADAPTIVE, RISING); static AD7150_TIMEOUT(0, mag_adaptive, falling, MAG_ADAPTIVE, FALLING); static AD7150_TIMEOUT(1, mag_adaptive, rising, MAG_ADAPTIVE, RISING); static AD7150_TIMEOUT(1, mag_adaptive, falling, MAG_ADAPTIVE, FALLING); static AD7150_TIMEOUT(0, thresh_adaptive, rising, THRESH_ADAPTIVE, RISING); static AD7150_TIMEOUT(0, thresh_adaptive, falling, THRESH_ADAPTIVE, FALLING); static AD7150_TIMEOUT(1, thresh_adaptive, rising, THRESH_ADAPTIVE, RISING); static AD7150_TIMEOUT(1, thresh_adaptive, falling, THRESH_ADAPTIVE, FALLING); static const struct iio_event_spec ad7150_events[] = { { .type = IIO_EV_TYPE_THRESH, .dir = IIO_EV_DIR_RISING, .mask_separate = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE), }, { .type = IIO_EV_TYPE_THRESH, .dir = IIO_EV_DIR_FALLING, .mask_separate = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE), }, { .type = IIO_EV_TYPE_THRESH_ADAPTIVE, .dir = IIO_EV_DIR_RISING, .mask_separate = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE), }, { .type = IIO_EV_TYPE_THRESH_ADAPTIVE, .dir = IIO_EV_DIR_FALLING, .mask_separate = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE), }, { .type = IIO_EV_TYPE_MAG_ADAPTIVE, .dir = IIO_EV_DIR_RISING, .mask_separate = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE), }, { .type = IIO_EV_TYPE_MAG_ADAPTIVE, .dir = IIO_EV_DIR_FALLING, .mask_separate = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE), }, }; static const struct iio_chan_spec ad7150_channels[] = { { .type = IIO_CAPACITANCE, .indexed = 1, .channel = 0, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_AVERAGE_RAW), .event_spec = ad7150_events, .num_event_specs = ARRAY_SIZE(ad7150_events), }, { .type = IIO_CAPACITANCE, .indexed = 1, .channel = 1, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_AVERAGE_RAW), .event_spec = ad7150_events, .num_event_specs = ARRAY_SIZE(ad7150_events), }, }; /* * threshold events */
static irqreturn_t ad7150_event_handler(int irq, void *private) { struct iio_dev *indio_dev = private; struct ad7150_chip_info *chip = iio_priv(indio_dev); u8 int_status; s64 timestamp = iio_get_time_ns(indio_dev); int ret; ret = i2c_smbus_read_byte_data(chip->client, AD7150_STATUS); if (ret < 0) return IRQ_HANDLED; int_status = ret; if ((int_status & AD7150_STATUS_OUT1) && !(chip->old_state & AD7150_STATUS_OUT1)) iio_push_event(indio_dev, IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE, 0, IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING), timestamp); else if ((!(int_status & AD7150_STATUS_OUT1)) && (chip->old_state & AD7150_STATUS_OUT1)) iio_push_event(indio_dev, IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE, 0, IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING), timestamp); if ((int_status & AD7150_STATUS_OUT2) && !(chip->old_state & AD7150_STATUS_OUT2)) iio_push_event(indio_dev, IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE, 1, IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING), timestamp); else if ((!(int_status & AD7150_STATUS_OUT2)) && (chip->old_state & AD7150_STATUS_OUT2)) iio_push_event(indio_dev, IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE, 1, IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING), timestamp); /* store the status to avoid repushing same events */ chip->old_state = int_status; return IRQ_HANDLED; }

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PersonTokensPropCommitsCommitProp
Barry Song12857.14%114.29%
Jonathan Cameron8939.73%457.14%
Michael Hennerich41.79%114.29%
Grégor Boirie31.34%114.29%
Total224100.00%7100.00%

/* Timeouts not currently handled by core */ static struct attribute *ad7150_event_attributes[] = { &iio_dev_attr_in_capacitance0_mag_adaptive_rising_timeout .dev_attr.attr, &iio_dev_attr_in_capacitance0_mag_adaptive_falling_timeout .dev_attr.attr, &iio_dev_attr_in_capacitance1_mag_adaptive_rising_timeout .dev_attr.attr, &iio_dev_attr_in_capacitance1_mag_adaptive_falling_timeout .dev_attr.attr, &iio_dev_attr_in_capacitance0_thresh_adaptive_rising_timeout .dev_attr.attr, &iio_dev_attr_in_capacitance0_thresh_adaptive_falling_timeout .dev_attr.attr, &iio_dev_attr_in_capacitance1_thresh_adaptive_rising_timeout .dev_attr.attr, &iio_dev_attr_in_capacitance1_thresh_adaptive_falling_timeout .dev_attr.attr, NULL, }; static const struct attribute_group ad7150_event_attribute_group = { .attrs = ad7150_event_attributes, .name = "events", }; static const struct iio_info ad7150_info = { .event_attrs = &ad7150_event_attribute_group, .driver_module = THIS_MODULE, .read_raw = &ad7150_read_raw, .read_event_config = &ad7150_read_event_config, .write_event_config = &ad7150_write_event_config, .read_event_value = &ad7150_read_event_value, .write_event_value = &ad7150_write_event_value, }; /* * device probe and remove */
static int ad7150_probe(struct i2c_client *client, const struct i2c_device_id *id) { int ret; struct ad7150_chip_info *chip; struct iio_dev *indio_dev; indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip)); if (!indio_dev) return -ENOMEM; chip = iio_priv(indio_dev); mutex_init(&chip->state_lock); /* this is only used for device removal purposes */ i2c_set_clientdata(client, indio_dev); chip->client = client; indio_dev->name = id->name; indio_dev->channels = ad7150_channels; indio_dev->num_channels = ARRAY_SIZE(ad7150_channels); /* Establish that the iio_dev is a child of the i2c device */ indio_dev->dev.parent = &client->dev; indio_dev->info = &ad7150_info; indio_dev->modes = INDIO_DIRECT_MODE; if (client->irq) { ret = devm_request_threaded_irq(&client->dev, client->irq, NULL, &ad7150_event_handler, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "ad7150_irq1", indio_dev); if (ret) return ret; } if (client->dev.platform_data) { ret = devm_request_threaded_irq(&client->dev, *(unsigned int *) client->dev.platform_data, NULL, &ad7150_event_handler, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "ad7150_irq2", indio_dev); if (ret) return ret; } ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev); if (ret) return ret; dev_info(&client->dev, "%s capacitive sensor registered,irq: %d\n", id->name, client->irq); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Barry Song11743.17%19.09%
Jonathan Cameron6925.46%654.55%
Michael Hennerich4416.24%19.09%
Sachin Kamat3011.07%19.09%
Ioana Ciornei72.58%19.09%
Lars-Peter Clausen41.48%19.09%
Total271100.00%11100.00%

static const struct i2c_device_id ad7150_id[] = { { "ad7150", 0 }, { "ad7151", 0 }, { "ad7156", 0 }, {} }; MODULE_DEVICE_TABLE(i2c, ad7150_id); static struct i2c_driver ad7150_driver = { .driver = { .name = "ad7150", }, .probe = ad7150_probe, .id_table = ad7150_id, }; module_i2c_driver(ad7150_driver); MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); MODULE_DESCRIPTION("Analog Devices AD7150/1/6 capacitive sensor driver"); MODULE_LICENSE("GPL v2");

Overall Contributors

PersonTokensPropCommitsCommitProp
Jonathan Cameron150953.13%1441.18%
Barry Song84929.89%12.94%
Lars-Peter Clausen37913.35%617.65%
Michael Hennerich501.76%25.88%
Sachin Kamat301.06%12.94%
Ioana Ciornei80.28%25.88%
Paul Gortmaker30.11%12.94%
Grégor Boirie30.11%12.94%
Shraddha Barke30.11%12.94%
Dan Carpenter20.07%12.94%
Cristina Moraru10.04%12.94%
Amit Kushwaha10.04%12.94%
Bhumika Goyal10.04%12.94%
Pan Bian10.04%12.94%
Total2840100.00%34100.00%
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