From 985e28d021f2e0b1298ce143eda0d0c11ffef63d Mon Sep 17 00:00:00 2001 From: "ramesh.chandrasekaran" Date: Thu, 8 Nov 2012 17:03:07 +0530 Subject: st-mems-sensors: Sensor Code Migration to IIO framework Signed-off-by: ramesh.chandrasekaran --- drivers/staging/iio/gyro/l3g4200d_core.c | 931 +++++++++++++++++++++++++++++++ 1 file changed, 931 insertions(+) create mode 100644 drivers/staging/iio/gyro/l3g4200d_core.c (limited to 'drivers/staging/iio/gyro/l3g4200d_core.c') diff --git a/drivers/staging/iio/gyro/l3g4200d_core.c b/drivers/staging/iio/gyro/l3g4200d_core.c new file mode 100644 index 00000000000..8455a7994e8 --- /dev/null +++ b/drivers/staging/iio/gyro/l3g4200d_core.c @@ -0,0 +1,931 @@ +/* + * Copyright (C) ST-Ericsson SA 2012 + * License Terms: GNU General Public License, version 2 + * + * Mostly this gyroscope device is a copy of magnetometer + * driver lsm303dlh or viceversa, so the code is mostly based + * on lsm303dlh driver. + * + * Author: Naga Radhesh Y + */ +#include +#include +#include +#include +#include +#include +#include +#include +#ifdef CONFIG_HAS_EARLYSUSPEND +#include +#endif +#include + +#include "../iio.h" +#include "../sysfs.h" + +/* Idenitification register */ +#define L3G4200D_WHO_AM_I 0x0F +/* control register1 */ +#define L3G4200D_CTRL_REG1 0x20 +/* control register2 */ +#define L3G4200D_CTRL_REG2 0x21 +/* control register3 */ +#define L3G4200D_CTRL_REG3 0x22 +/* control register4 */ +#define L3G4200D_CTRL_REG4 0x23 +/* control register5 */ +#define L3G4200D_CTRL_REG5 0x24 +/* out temperature */ +#define L3G4200D_OUT_TEMP 0x26 +/* data output X register */ +#define L3G4200D_OUT_X_L_A 0x28 +/* data output Y register */ +#define L3G4200D_OUT_Y_L_A 0x2A +/* data output Z register */ +#define L3G4200D_OUT_Z_L_A 0x2C +/* status register */ +#define L3G4200D_STATUS_REG_A 0x27 + +/* control register 1, Mode selection */ +#define L3G4200D_CR1_PM_BIT 3 +#define L3G4200D_CR1_PM_MASK (0x01 << L3G4200D_CR1_PM_BIT) +/* control register 1, Data Rate */ +#define L3G4200D_CR1_DR_BIT 4 +#define L3G4200D_CR1_DR_MASK (0x0F << L3G4200D_CR1_DR_BIT) +/* control register 1, x,y,z enable bits */ +#define L3G4200D_CR1_EN_BIT 0 +#define L3G4200D_CR1_EN_MASK (0x7 << L3G4200D_CR1_EN_BIT) +#define L3G4200D_CR1_AXIS_ENABLE 7 + +/* control register 4, self test */ +#define L3G4200D_CR4_ST_BIT 1 +#define L3G4200D_CR4_ST_MASK (0x03 << L3G4200D_CR4_ST_BIT) +/* control register 4, full scale */ +#define L3G4200D_CR4_FS_BIT 4 +#define L3G4200D_CR4_FS_MASK (0x3 << L3G4200D_CR4_FS_BIT) +/* control register 4, endianness */ +#define L3G4200D_CR4_BLE_BIT 6 +#define L3G4200D_CR4_BLE_MASK (0x1 << L3G4200D_CR4_BLE_BIT) +/* control register 4, Block data update */ +#define L3G4200D_CR4_BDU_BIT 7 +#define L3G4200D_CR4_BDU_MASK (0x1 << L3G4200D_CR4_BDU_BIT) + +/* Gyroscope operating mode */ +#define L3G4200D_MODE_OFF 0x00 +#define L3G4200D_MODE_NORMAL 0x01 + +/* Expected content for WAI register */ +#define WHOAMI_L3G4200D 0x00D3 +/* Expected content for WAI register for L3GD20*/ +#define WHOAMI_L3GD20 0x00D4 + +/* + * CTRL_REG1 register rate settings + * + * DR1 DR0 BW1 BW0 Output data rate[Hz] + * 0 0 0 0 100 + * 0 0 0 1 100 + * 0 0 1 0 100 + * 0 0 1 1 100 + * 0 1 0 0 200 + * 0 1 0 1 200 + * 0 1 1 0 200 + * 0 1 1 1 200 + * 1 0 0 0 400 + * 1 0 0 1 400 + * 1 0 1 0 400 + * 1 0 1 1 400 + * 1 1 0 0 800 + * 1 1 0 1 800 + * 1 1 1 0 800 + * 1 1 1 1 800 + */ +#define L3G4200D_ODR_MIN_VAL 0x00 +#define L3G4200D_ODR_MAX_VAL 0x0F +#define L3G4200D_RATE_100 0x00 +#define L3G4200D_RATE_200 0x04 +#define L3G4200D_RATE_400 0x08 +#define L3G4200D_RATE_800 0x0C + +/* + * CTRL_REG4 register range settings + * + * FS1 FS0 FUll scale range + * 0 0 250 + * 0 1 500 + * 1 0 2000 + * 1 1 2000 + */ +#define L3G4200D_RANGE_250 0x00 +#define L3G4200D_RANGE_500 0x01 +#define L3G4200D_RANGE_2000 0x03 + +/* device status defines */ +#define L3G4200D_DEVICE_OFF 0 +#define L3G4200D_DEVICE_ON 1 +#define L3G4200D_DEVICE_SUSPENDED 2 + +/* status register */ +#define L3G4200D_SR_REG_A 0x27 +/* status register, ready */ +#define L3G4200D_XYZ_DATA_RDY 0x80 +#define L3G4200D_XYZ_DATA_RDY_BIT 3 +#define L3G4200D_XYZ_DATA_RDY_MASK (0x1 << L3G4200D_XYZ_DATA_RDY_BIT) + +/* Multiple byte transfer enable */ +#define MULTIPLE_I2C_TR 0x80 + +/* + * struct l3g4200d_data - data structure used by l3g4200d driver + * @client: i2c client + * @lock: mutex lock for sysfs operations + * @regulator: regulator + * @early_suspend: early suspend structure + * @pdata: l3g4200d platform data + * @mode: current mode of operation + * @rate: current sampling rate + * @range: current range value of Gyroscope + * @device_status: device is ON, OFF or SUSPENDED + */ + +struct l3g4200d_data { + struct i2c_client *client; + struct mutex lock; + struct regulator *regulator; +#ifdef CONFIG_HAS_EARLYSUSPEND + struct early_suspend early_suspend; +#endif + struct l3g4200d_gyr_platform_data *pdata; + + u8 mode; + u8 rate; + u8 range; + int device_status; +}; + +#ifdef CONFIG_HAS_EARLYSUSPEND +static void l3g4200d_early_suspend(struct early_suspend *data); +static void l3g4200d_late_resume(struct early_suspend *data); +#endif +static inline int is_device_on(struct l3g4200d_data *data) +{ + struct i2c_client *client = data->client; + /* Perform read/write operation only when device is active */ + if (data->device_status != L3G4200D_DEVICE_ON) { + dev_err(&client->dev, + "device is switched off, make it on using mode"); + return -EINVAL; + } + + return 0; +} + +/* To disable regulator and status */ +static int l3g4200d_disable(struct l3g4200d_data *data) +{ + data->device_status = L3G4200D_DEVICE_OFF; + + regulator_disable(data->regulator); + + return 0; +} + +/* To enable regulator and status */ +static int l3g4200d_enable(struct l3g4200d_data *data) +{ + data->device_status = L3G4200D_DEVICE_ON; + + regulator_enable(data->regulator); + + return 0; +} + +static s32 l3g4200d_set_mode(struct i2c_client *client, u8 mode) +{ + int reg_val; + + if (mode > L3G4200D_MODE_NORMAL) { + dev_err(&client->dev, "given mode not supported\n"); + return -EINVAL; + } + + reg_val = i2c_smbus_read_byte_data(client, L3G4200D_CTRL_REG1); + + reg_val |= L3G4200D_CR1_AXIS_ENABLE; + reg_val &= ~L3G4200D_CR1_PM_MASK; + + reg_val |= ((mode << L3G4200D_CR1_PM_BIT) & L3G4200D_CR1_PM_MASK); + + /* the 4th bit indicates the gyroscope sensor mode */ + return i2c_smbus_write_byte_data(client, L3G4200D_CTRL_REG1, reg_val); +} + +static s32 l3g4200d_set_rate(struct i2c_client *client, u8 rate) +{ + int reg_val; + + if (rate > L3G4200D_ODR_MAX_VAL) { + dev_err(&client->dev, "given rate not supported\n"); + return -EINVAL; + } + reg_val = i2c_smbus_read_byte_data(client, L3G4200D_CTRL_REG1); + + reg_val &= ~L3G4200D_CR1_DR_MASK; + + reg_val |= ((rate << L3G4200D_CR1_DR_BIT) & L3G4200D_CR1_DR_MASK); + + /* upper 4 bits indicate ODR of Gyroscope */ + return i2c_smbus_write_byte_data(client, L3G4200D_CTRL_REG1, reg_val); +} + +static s32 l3g4200d_set_range(struct i2c_client *client, u8 range) +{ + int reg_val; + + if (range > L3G4200D_RANGE_2000) { + dev_err(&client->dev, "given range not supported\n"); + return -EINVAL; + } + + reg_val = (range << L3G4200D_CR4_FS_BIT); + /* + * If BDU is enabled, output registers are not updated until MSB + * and LSB reading completes.Otherwise we will end up reading + * wrong data. + */ + reg_val |= L3G4200D_CR4_BDU_MASK; + + /* 5th and 6th bits indicate rate of gyroscope */ + return i2c_smbus_write_byte_data(client, L3G4200D_CTRL_REG4, reg_val); +} + +/* + * To read output x/y/z data register, + * in this case x,y and z are not + * mapped w.r.t board orientation. + * Reading just raw data from device + */ +static ssize_t l3g4200d_xyz_read(struct iio_dev *indio_dev, + int address, + int *buf) +{ + + struct l3g4200d_data *data = iio_priv(indio_dev); + int lsb , msb; + int ret; + s16 val; + + /* Perform read/write operation, only when device is active */ + ret = is_device_on(data); + if (ret) + return -EINVAL; + mutex_lock(&data->lock); + + ret = i2c_smbus_read_byte_data(data->client, L3G4200D_SR_REG_A); + + /* wait till data is written to all six registers */ + while (!(ret & L3G4200D_XYZ_DATA_RDY_MASK)) + ret = i2c_smbus_read_byte_data(data->client, L3G4200D_SR_REG_A); + + lsb = i2c_smbus_read_byte_data(data->client, address); + if (lsb < 0) { + dev_err(&data->client->dev, "reading xyz failed\n"); + mutex_unlock(&data->lock); + return -EINVAL; + } + msb = i2c_smbus_read_byte_data(data->client, (address + 1)); + if (msb < 0) { + dev_err(&data->client->dev, "reading xyz failed\n"); + mutex_unlock(&data->lock); + return -EINVAL; + } + val = ((msb << 8) | lsb); + + *buf = (s16)val; + mutex_unlock(&data->lock); + + return IIO_VAL_INT; +} + +/* + * To read output x,y,z data register. + * After reading change x,y and z values + * w.r.t the orientation of the device. + */ +static ssize_t l3g4200d_readdata(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + + struct l3g4200d_data *data = iio_priv(dev_get_drvdata(dev)); + struct l3g4200d_gyr_platform_data *pdata = data->pdata; + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + u8 map_x = pdata->axis_map_x; + u8 map_y = pdata->axis_map_y; + u8 map_z = pdata->axis_map_z; + int ret; + unsigned char gyr_data[6]; + s16 val[3]; + + /* Perform read/write operation, only when device is active */ + ret = is_device_on(data); + if (ret) + return -EINVAL; + + mutex_lock(&data->lock); + + ret = i2c_smbus_read_byte_data(data->client, L3G4200D_SR_REG_A); + /* wait till data is written to all six registers */ + while (!((ret & L3G4200D_XYZ_DATA_RDY_MASK))) + ret = i2c_smbus_read_byte_data(data->client, L3G4200D_SR_REG_A); + + ret = i2c_smbus_read_i2c_block_data(data->client, + this_attr->address | MULTIPLE_I2C_TR, 6, gyr_data); + + if (ret < 0) { + dev_err(&data->client->dev, "reading xyz failed\n"); + mutex_unlock(&data->lock); + return -EINVAL; + } + + /* MSB is at lower address */ + val[0] = (s16) + (((gyr_data[1]) << 8) | gyr_data[0]); + val[1] = (s16) + (((gyr_data[3]) << 8) | gyr_data[2]); + val[2] = (s16) + (((gyr_data[5]) << 8) | gyr_data[4]); + + /* modify the x,y and z values w.r.t orientation of device*/ + if (pdata->negative_x) + val[map_x] = -val[map_x]; + if (pdata->negative_y) + val[map_y] = -val[map_y]; + if (pdata->negative_z) + val[map_z] = -val[map_z]; + + mutex_unlock(&data->lock); + + return sprintf(buf, "%d:%d:%d:%lld\n", val[map_x], val[map_y], + val[map_z], iio_get_time_ns()); +} + +static ssize_t get_gyrotemp(struct iio_dev *indio_dev, + int address, + int *buf) +{ + struct l3g4200d_data *data = iio_priv(indio_dev); + int ret; + /* Perform read/write operation, only when device is active */ + ret = is_device_on(data); + if (ret) + return -EINVAL; + + ret = i2c_smbus_read_byte_data(data->client, address); + if (ret < 0) { + dev_err(&data->client->dev, "Error in reading Gyro temperature"); + return ret; + } + *buf = ret; + + return IIO_VAL_INT; +} + +static ssize_t show_operating_mode(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct l3g4200d_data *data = iio_priv(dev_get_drvdata(dev)); + + return sprintf(buf, "%d\n", data->mode); +} + +static ssize_t set_operating_mode(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct l3g4200d_data *data = iio_priv(dev_get_drvdata(dev)); + int error; + unsigned long mode = 0; + + mutex_lock(&data->lock); + + error = kstrtoul(buf, 10, &mode); + if (error) { + count = error; + goto exit; + } + + /* check if the received power mode is either 0 or 1 */ + if (mode < L3G4200D_MODE_OFF || mode > L3G4200D_MODE_NORMAL) { + dev_err(&data->client->dev, "trying to set invalid mode\n"); + count = -EINVAL; + goto exit; + } + /* + * If device is drived to sleep mode in suspend, update mode + * and return + */ + if (data->device_status == L3G4200D_DEVICE_SUSPENDED && + mode == L3G4200D_MODE_OFF) { + data->mode = mode; + goto exit; + } + + /* if same mode as existing, return */ + if (data->mode == mode) + goto exit; + + /* Enable the regulator if it is not turned ON earlier */ + if (data->device_status == L3G4200D_DEVICE_OFF || + data->device_status == L3G4200D_DEVICE_SUSPENDED) + l3g4200d_enable(data); + + dev_dbg(dev, "set operating mode to %lu\n", mode); + error = l3g4200d_set_mode(data->client, mode); + if (error < 0) { + dev_err(&data->client->dev, "Error in setting the mode\n"); + count = -EINVAL; + goto exit; + } + + data->mode = mode; + + /* If mode is OFF then disable the regulator */ + if (data->mode == L3G4200D_MODE_OFF) { + /* fall back to default values */ + data->rate = L3G4200D_RATE_100; + data->range = L3G4200D_ODR_MIN_VAL; + l3g4200d_disable(data); + } +exit: + mutex_unlock(&data->lock); + return count; +} + +static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("100 200 400 800"); + +static ssize_t set_sampling_frequency(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct l3g4200d_data *data = iio_priv(dev_get_drvdata(dev)); + unsigned long rate = 0; + int err; + + /* Perform read/write operation, only when device is active */ + err = is_device_on(data); + if (err) + return -EINVAL; + + if (strncmp(buf, "100" , 3) == 0) + rate = L3G4200D_RATE_100; + + else if (strncmp(buf, "200" , 3) == 0) + rate = L3G4200D_RATE_200; + + else if (strncmp(buf, "400" , 3) == 0) + rate = L3G4200D_RATE_400; + + else if (strncmp(buf, "800" , 3) == 0) + rate = L3G4200D_RATE_800; + else + return -EINVAL; + + mutex_lock(&data->lock); + + if (l3g4200d_set_rate(data->client, rate)) { + dev_err(&data->client->dev, "set rate failed\n"); + count = -EINVAL; + goto exit; + } + data->rate = rate; + +exit: + mutex_unlock(&data->lock); + return count; +} + +/* sampling frequency - output rate in Hz */ +static const char * const reg_to_rate[] = { + "100", + "100", + "100", + "100", + "200", + "200", + "200", + "200", + "400", + "400", + "400", + "400", + "800", + "800", + "800", + "800" +}; + +static ssize_t show_sampling_frequency(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct l3g4200d_data *data = iio_priv(dev_get_drvdata(dev)); + + return sprintf(buf, "%s\n", reg_to_rate[data->rate]); +} + +static IIO_CONST_ATTR(gyro_xyz_scale_available, "8750000, 17500000, 70000000"); + +static const int xyz_to_nanoscale[] = { + 8750000, 17500000, 70000000 +}; + +static const char const scale_to_range[] = { + L3G4200D_RANGE_250, + L3G4200D_RANGE_500, + L3G4200D_RANGE_2000, +}; + +static int l3g4200d_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, + long mask) +{ + struct l3g4200d_data *data = iio_priv(indio_dev); + int ret = -EINVAL, i; + bool flag = false; + char end; + + switch (mask) { + case IIO_CHAN_INFO_SCALE: + ret = is_device_on(data); + if (ret) + return -EINVAL; + mutex_lock(&data->lock); + end = ARRAY_SIZE(xyz_to_nanoscale); + for (i = 0; i < end; i++) { + if (val == xyz_to_nanoscale[i]) { + flag = true; + break; + } + } + if (flag) { + ret = l3g4200d_set_range(data->client, scale_to_range[i]); + data->range = i; + } + mutex_unlock(&data->lock); + default: + break; + } + return ret; +} + +static int l3g4200d_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct l3g4200d_data *data = iio_priv(indio_dev); + switch (mask) { + case 0: + switch (chan->type) { + case IIO_ANGL_VEL: + return l3g4200d_xyz_read(indio_dev, + chan->address, val); + case IIO_TEMP: + return get_gyrotemp(indio_dev, chan->address , val); + default: + break; + } + break; + case IIO_CHAN_INFO_SCALE: + switch (chan->type) { + case IIO_ANGL_VEL: + *val = 0; + /* scale for X/Y and Z are different */ + *val2 = xyz_to_nanoscale[data->range]; + return IIO_VAL_INT_PLUS_NANO; + default: + break; + } + break; + default: + break; + } + return -EINVAL; +} + +#define L3G4200D_CHANNEL(axis, addr) \ + { \ + .type = IIO_ANGL_VEL, \ + .modified = 1, \ + .channel2 = IIO_MOD_##axis, \ + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT, \ + .address = addr, \ + } + +#define L3G4200D_TEMP_CHANNEL(addr) \ + { \ + .type = IIO_TEMP, \ + .indexed = 1, \ + .channel = 0, \ + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT, \ + .address = addr, \ + } + +static const struct iio_chan_spec l3g4200d_channels[] = { + L3G4200D_CHANNEL(X, L3G4200D_OUT_X_L_A), + L3G4200D_CHANNEL(Y, L3G4200D_OUT_Y_L_A), + L3G4200D_CHANNEL(Z, L3G4200D_OUT_Z_L_A), + L3G4200D_TEMP_CHANNEL(L3G4200D_OUT_TEMP), +}; + +static IIO_DEVICE_ATTR(gyro_raw, + S_IRUGO, + l3g4200d_readdata, + NULL, + L3G4200D_OUT_X_L_A); +static IIO_DEVICE_ATTR(sampling_frequency, + S_IWUGO | S_IRUGO, + show_sampling_frequency, + set_sampling_frequency, + L3G4200D_CTRL_REG1); +static IIO_DEVICE_ATTR(mode, + S_IWUGO | S_IRUGO, + show_operating_mode, + set_operating_mode, + L3G4200D_CTRL_REG1); + +static struct attribute *l3g4200d_attributes[] = { + &iio_dev_attr_mode.dev_attr.attr, + &iio_dev_attr_sampling_frequency.dev_attr.attr, + &iio_dev_attr_gyro_raw.dev_attr.attr, + &iio_const_attr_sampling_frequency_available.dev_attr.attr, + &iio_const_attr_gyro_xyz_scale_available.dev_attr.attr, + NULL +}; + +static const struct attribute_group l3g4200d_group = { + .attrs = l3g4200d_attributes, +}; + +static const struct iio_info l3g4200d_info = { + .attrs = &l3g4200d_group, + .read_raw = &l3g4200d_read_raw, + .write_raw = &l3g4200d_write_raw, + .driver_module = THIS_MODULE, +}; + +static void l3g4200d_setup(struct l3g4200d_data *data) +{ + /* set mode */ + l3g4200d_set_mode(data->client, data->mode); + /* set rate */ + l3g4200d_set_rate(data->client, data->rate); + /* set range */ + l3g4200d_set_range(data->client, scale_to_range[data->range]); +} + +#if (!defined(CONFIG_HAS_EARLYSUSPEND) && defined(CONFIG_PM)) +static int l3g4200d_suspend(struct device *dev) +{ + struct l3g4200d_data *data = iio_priv(dev_get_drvdata(dev)); + int ret = 0; + + if (data->mode == L3G4200D_MODE_OFF) + return 0; + + mutex_lock(&data->lock); + + /* Set the device to sleep mode */ + l3g4200d_set_mode(data->client, L3G4200D_MODE_OFF); + + /* Disable regulator */ + l3g4200d_disable(data); + + data->device_status = L3G4200D_DEVICE_SUSPENDED; + + mutex_unlock(&data->lock); + + return ret; +} + +static int l3g4200d_resume(struct device *dev) +{ + struct l3g4200d_data *data = iio_priv(dev_get_drvdata(dev)); + int ret = 0; + + + if (data->device_status == L3G4200D_DEVICE_ON || + data->device_status == L3G4200D_DEVICE_OFF) { + return 0; + } + mutex_lock(&data->lock); + + /* Enable regulator */ + l3g4200d_enable(data); + + /* Set mode,rate and range */ + l3g4200d_setup(data); + + mutex_unlock(&data->lock); + return ret; +} + +static const struct dev_pm_ops l3g4200d_dev_pm_ops = { + .suspend = l3g4200d_suspend, + .resume = l3g4200d_resume, +}; +#endif +#ifdef CONFIG_HAS_EARLYSUSPEND +static void l3g4200d_early_suspend(struct early_suspend *data) +{ + struct l3g4200d_data *ddata = + container_of(data, struct l3g4200d_data, early_suspend); + + if (ddata->mode == L3G4200D_MODE_OFF) + return; + + mutex_lock(&ddata->lock); + + /* Set the device to sleep mode */ + l3g4200d_set_mode(ddata->client, L3G4200D_MODE_OFF); + + /* Disable regulator */ + l3g4200d_disable(ddata); + + ddata->device_status = L3G4200D_DEVICE_SUSPENDED; + + mutex_unlock(&ddata->lock); + +} + +static void l3g4200d_late_resume(struct early_suspend *data) +{ + struct l3g4200d_data *ddata = + container_of(data, struct l3g4200d_data, early_suspend); + + if (ddata->device_status == L3G4200D_DEVICE_ON || + ddata->device_status == L3G4200D_DEVICE_OFF) { + return; + } + mutex_lock(&ddata->lock); + + /* Enable regulator */ + l3g4200d_enable(ddata); + + /* Set mode,rate and range */ + l3g4200d_setup(ddata); + + mutex_unlock(&ddata->lock); + +} +#endif + +static int l3g4200d_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct l3g4200d_data *data; + struct iio_dev *indio_dev; + int err = 0; + + indio_dev = iio_allocate_device(sizeof(*data)); + if (indio_dev == NULL) { + dev_err(&client->dev, "memory allocation failed\n"); + err = -ENOMEM; + goto exit; + } + data = iio_priv(indio_dev); + + data->mode = L3G4200D_MODE_OFF; + data->range = L3G4200D_RANGE_250; + data->rate = L3G4200D_ODR_MIN_VAL; + data->device_status = L3G4200D_DEVICE_OFF; + data->client = client; + + /* check for valid platform data */ + if (!client->dev.platform_data) { + dev_err(&client->dev, "Invalid platform data\n"); + err = -ENOMEM; + goto exit1; + } + data->pdata = client->dev.platform_data; + + i2c_set_clientdata(client, indio_dev); + + data->regulator = regulator_get(&client->dev, "vdd"); + if (IS_ERR(data->regulator)) { + err = PTR_ERR(data->regulator); + dev_err(&client->dev, "failed to get regulator = %d\n", err); + goto exit1; + } + /* Enable regulator */ + l3g4200d_enable(data); + + mutex_init(&data->lock); + + err = i2c_smbus_read_byte_data(client, L3G4200D_WHO_AM_I); + if (err < 0) { + dev_err(&client->dev, "failed to read of the chip\n"); + goto exit2; + } + if (err == WHOAMI_L3G4200D || err == WHOAMI_L3GD20) + dev_info(&client->dev, + "3-Axis Gyroscope device identification: %d\n", + err); + else { + dev_info(&client->dev, + "Gyroscope identification did not match\n"); + goto exit2; + } + + l3g4200d_setup(data); + + indio_dev->info = &l3g4200d_info; + indio_dev->name = id->name; + indio_dev->dev.parent = &client->dev; + indio_dev->channels = l3g4200d_channels; + indio_dev->num_channels = ARRAY_SIZE(l3g4200d_channels); + indio_dev->modes = INDIO_DIRECT_MODE; + + err = iio_device_register(indio_dev); + if (err) + goto exit2; + +#ifdef CONFIG_HAS_EARLYSUSPEND + data->early_suspend.level = + EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1; + data->early_suspend.suspend = l3g4200d_early_suspend; + data->early_suspend.resume = l3g4200d_late_resume; + register_early_suspend(&data->early_suspend); +#endif + + /* Disable regulator */ + l3g4200d_disable(data); + + return 0; + +exit2: + iio_free_device(indio_dev); + mutex_destroy(&data->lock); + l3g4200d_disable(data); + regulator_put(data->regulator); +exit1: + kfree(data); +exit: + return err; +} + +static int __devexit l3g4200d_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + struct l3g4200d_data *data = iio_priv(indio_dev); + int ret; + + /* safer to make device off */ + if (data->mode != L3G4200D_MODE_OFF) { + /* set mode to off */ + ret = l3g4200d_set_mode(client, L3G4200D_MODE_OFF); + if (ret < 0) { + dev_err(&client->dev, + "could not turn off the device %d", + ret); + return ret; + } + if (data->device_status == L3G4200D_DEVICE_ON) { + regulator_disable(data->regulator); + data->device_status = L3G4200D_DEVICE_OFF; + } + } + regulator_put(data->regulator); + mutex_destroy(&data->lock); + iio_device_unregister(indio_dev); + iio_free_device(indio_dev); + kfree(data); + return 0; +} + +static const struct i2c_device_id l3g4200d_id[] = { + { "l3g4200d", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, l3g4200d_id); + +static struct i2c_driver l3g4200d_driver = { + .driver = { + .name = "l3g4200d", + #if (!defined(CONFIG_HAS_EARLYSUSPEND) && defined(CONFIG_PM)) + .pm = &l3g4200d_dev_pm_ops, + #endif + }, + .id_table = l3g4200d_id, + .probe = l3g4200d_probe, + .remove = l3g4200d_remove, +}; + +module_i2c_driver(l3g4200d_driver); + +MODULE_DESCRIPTION("l3g4200d Gyroscope Driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Naga Radhesh Y "); -- cgit v1.2.3