diff options
Diffstat (limited to 'drivers/hwmon/lsm303dlh_m.c')
| -rw-r--r-- | drivers/hwmon/lsm303dlh_m.c | 928 |
1 files changed, 928 insertions, 0 deletions
diff --git a/drivers/hwmon/lsm303dlh_m.c b/drivers/hwmon/lsm303dlh_m.c new file mode 100644 index 00000000000..270e532f78b --- /dev/null +++ b/drivers/hwmon/lsm303dlh_m.c @@ -0,0 +1,928 @@ +/* + * lsm303dlh_m.c + * ST 3-Axis Magnetometer Driver + * + * Copyright (C) 2010 STMicroelectronics + * Author: Carmine Iascone (carmine.iascone@st.com) + * Author: Matteo Dameno (matteo.dameno@st.com) + * + * Copyright (C) 2010 STEricsson + * Author: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com> + * Updated:Preetham Rao Kaskurthi <preetham.rao@stericsson.com> + * + * 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. + * + * 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, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/slab.h> +#include <linux/mutex.h> +#include <linux/platform_device.h> +#include <linux/delay.h> +#include <linux/err.h> + +#ifdef CONFIG_SENSORS_LSM303DLH_INPUT_DEVICE +#include <linux/input.h> +#include <linux/interrupt.h> +#include <mach/gpio.h> +#endif + +#include <linux/lsm303dlh.h> +#include <linux/regulator/consumer.h> +#ifdef CONFIG_HAS_EARLYSUSPEND +#include <linux/earlysuspend.h> +#endif +#include <linux/kernel.h> + +/* lsm303dlh magnetometer registers */ +#define IRA_REG_M 0x0A + +/* Magnetometer registers */ +#define CRA_REG_M 0x00 /* Configuration register A */ +#define CRB_REG_M 0x01 /* Configuration register B */ +#define MR_REG_M 0x02 /* Mode register */ +#define SR_REG_M 0x09 /* Status register */ + +/* Output register start address*/ +#define OUT_X_M 0x03 +#define OUT_Y_M 0x05 +#define OUT_Z_M 0x07 + +/* Magnetometer X-Y gain */ +#define XY_GAIN_1_3 1055 /* XY gain at 1.3G */ +#define XY_GAIN_1_9 795 /* XY gain at 1.9G */ +#define XY_GAIN_2_5 635 /* XY gain at 2.5G */ +#define XY_GAIN_4_0 430 /* XY gain at 4.0G */ +#define XY_GAIN_4_7 375 /* XY gain at 4.7G */ +#define XY_GAIN_5_6 320 /* XY gain at 5.6G */ +#define XY_GAIN_8_1 230 /* XY gain at 8.1G */ + +/* Magnetometer Z gain */ +#define Z_GAIN_1_3 950 /* Z gain at 1.3G */ +#define Z_GAIN_1_9 710 /* Z gain at 1.9G */ +#define Z_GAIN_2_5 570 /* Z gain at 2.5G */ +#define Z_GAIN_4_0 385 /* Z gain at 4.0G */ +#define Z_GAIN_4_7 335 /* Z gain at 4.7G */ +#define Z_GAIN_5_6 285 /* Z gain at 5.6G */ +#define Z_GAIN_8_1 205 /* Z gain at 8.1G */ + +/* Control A regsiter. */ +#define LSM303DLH_M_CRA_DO_BIT 2 +#define LSM303DLH_M_CRA_DO_MASK (0x7 << LSM303DLH_M_CRA_DO_BIT) +#define LSM303DLH_M_CRA_MS_BIT 0 +#define LSM303DLH_M_CRA_MS_MASK (0x3 << LSM303DLH_M_CRA_MS_BIT) + +/* Control B regsiter. */ +#define LSM303DLH_M_CRB_GN_BIT 5 +#define LSM303DLH_M_CRB_GN_MASK (0x7 << LSM303DLH_M_CRB_GN_BIT) + +/* Control Mode regsiter. */ +#define LSM303DLH_M_MR_MD_BIT 0 +#define LSM303DLH_M_MR_MD_MASK (0x3 << LSM303DLH_M_MR_MD_BIT) + +/* Control Status regsiter. */ +#define LSM303DLH_M_SR_RDY_BIT 0 +#define LSM303DLH_M_SR_RDY_MASK (0x1 << LSM303DLH_M_SR_RDY_BIT) +#define LSM303DLH_M_SR_LOC_BIT 1 +#define LSM303DLH_M_SR_LCO_MASK (0x1 << LSM303DLH_M_SR_LOC_BIT) +#define LSM303DLH_M_SR_REN_BIT 2 +#define LSM303DLH_M_SR_REN_MASK (0x1 << LSM303DLH_M_SR_REN_BIT) + +/* Magnetometer gain setting */ +#define LSM303DLH_M_RANGE_1_3G 0x01 +#define LSM303DLH_M_RANGE_1_9G 0x02 +#define LSM303DLH_M_RANGE_2_5G 0x03 +#define LSM303DLH_M_RANGE_4_0G 0x04 +#define LSM303DLH_M_RANGE_4_7G 0x05 +#define LSM303DLH_M_RANGE_5_6G 0x06 +#define LSM303DLH_M_RANGE_8_1G 0x07 + +/* Magnetometer capturing mode */ +#define LSM303DLH_M_MODE_CONTINUOUS 0 +#define LSM303DLH_M_MODE_SINGLE 1 +#define LSM303DLH_M_MODE_SLEEP 3 + +/* Magnetometer output data rate */ +#define LSM303DLH_M_RATE_00_75 0x00 +#define LSM303DLH_M_RATE_01_50 0x01 +#define LSM303DLH_M_RATE_03_00 0x02 +#define LSM303DLH_M_RATE_07_50 0x03 +#define LSM303DLH_M_RATE_15_00 0x04 +#define LSM303DLH_M_RATE_30_00 0x05 +#define LSM303DLH_M_RATE_75_00 0x06 + +#ifdef CONFIG_SENSORS_LSM303DLHC +#define LSM303DLH_M_RATE_220_00 0x07 +#endif + +/* Multiple byte transfer enable */ +#define MULTIPLE_I2C_TR 0x80 + +/* device status defines */ +#define DEVICE_OFF 0 +#define DEVICE_ON 1 +#define DEVICE_SUSPENDED 2 + +/* device CHIP ID defines */ +#define LSM303DLHC_CHIP_ID 51 + +/** + * struct lsm303dlh_m_data - data structure used by lsm303dlh_m driver + * @client: i2c client + * @lock: mutex lock for sysfs operations + * @input_dev: input device + * @regulator: regulator + * @pdata: lsm303dlh platform data + * @gain: x, y and z axes gain + * @data: Magnetic field values of x, y and z axes + * @mode: current mode of operation + * @rate: current sampling rate + * @range: current range value of magnetometer + * @early_suspend: early suspend structure + * @device_status: device is ON, OFF or SUSPENDED + */ +struct lsm303dlh_m_data { + struct i2c_client *client; + /* lock for sysfs operations */ + struct mutex lock; + +#ifdef CONFIG_SENSORS_LSM303DLH_INPUT_DEVICE + struct input_dev *input_dev; +#endif + struct regulator *regulator; + struct lsm303dlh_platform_data pdata; + + short gain[3]; + short data[3]; + unsigned char mode; + unsigned char rate; + unsigned char range; +#ifdef CONFIG_HAS_EARLYSUSPEND + struct early_suspend early_suspend; +#endif + int device_status; +}; + +#ifdef CONFIG_HAS_EARLYSUSPEND +static void lsm303dlh_m_early_suspend(struct early_suspend *data); +static void lsm303dlh_m_late_resume(struct early_suspend *data); +#endif + +static int lsm303dlh_m_set_mode(struct lsm303dlh_m_data *ddata, + unsigned char mode); +static int lsm303dlh_m_write(struct lsm303dlh_m_data *ddata, + u8 reg, u8 val, char *msg) +{ + int ret = i2c_smbus_write_byte_data(ddata->client, reg, val); + if (ret < 0) + dev_err(&ddata->client->dev, + "i2c_smbus_write_byte_data failed error %d\ + Register (%s)\n", ret, msg); + return ret; +} + +#if defined(CONFIG_HAS_EARLYSUSPEND) || defined(CONFIG_PM) +static int lsm303dlh_m_do_suspend(struct lsm303dlh_m_data *ddata) +{ + int ret; + + mutex_lock(&ddata->lock); + + if (ddata->mode == LSM303DLH_M_MODE_SLEEP) { + mutex_unlock(&ddata->lock); + return 0; + } + +#ifdef CONFIG_SENSORS_LSM303DLH_INPUT_DEVICE + disable_irq(gpio_to_irq(ddata->pdata.irq_m)); +#endif + + ret = lsm303dlh_m_set_mode(ddata, LSM303DLH_M_MODE_SLEEP); + + if (ddata->regulator) + regulator_disable(ddata->regulator); + + ddata->device_status = DEVICE_SUSPENDED; + + mutex_unlock(&ddata->lock); + + return ret; +} + +static int lsm303dlh_m_restore(struct lsm303dlh_m_data *ddata) +{ + int ret = 0; + + mutex_lock(&ddata->lock); + + if (ddata->device_status == DEVICE_ON) { + mutex_unlock(&ddata->lock); + return 0; + } + + /* in correct mode, no need to change it */ + if (ddata->mode == LSM303DLH_M_MODE_SLEEP) { + ddata->device_status = DEVICE_OFF; + mutex_unlock(&ddata->lock); + return 0; + } else + ddata->device_status = DEVICE_ON; + +#ifdef CONFIG_SENSORS_LSM303DLH_INPUT_DEVICE + enable_irq(gpio_to_irq(ddata->pdata.irq_m)); +#endif + + if (ddata->regulator) + regulator_enable(ddata->regulator); + + ret = lsm303dlh_m_write(ddata, CRB_REG_M, ddata->range, "SET RANGE"); + + if (ret < 0) + goto fail; + + ret = lsm303dlh_m_write(ddata, CRA_REG_M, ddata->rate, "SET RATE"); + + if (ret < 0) + goto fail; + + ret = lsm303dlh_m_set_mode(ddata, ddata->mode); + + if (ret < 0) + goto fail; + +fail: + mutex_unlock(&ddata->lock); + return ret; +} +#endif + +static int lsm303dlh_m_read_multi(struct lsm303dlh_m_data *ddata, u8 reg, + u8 count, u8 *val, char *msg) +{ + int ret = i2c_smbus_read_i2c_block_data(ddata->client, + reg | MULTIPLE_I2C_TR, count, val); + if (ret < 0) + dev_err(&ddata->client->dev, + "i2c_smbus_read_i2c_block_data failed error %d\ + Register (%s)\n", ret, msg); + return ret; +} + +static ssize_t lsm303dlh_m_show_rate(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct platform_device *pdev = to_platform_device(dev); + struct lsm303dlh_m_data *ddata = platform_get_drvdata(pdev); + + return sprintf(buf, "%d\n", ddata->rate >> LSM303DLH_M_CRA_DO_BIT); +} + +/* set lsm303dlh magnetometer bandwidth */ +static ssize_t lsm303dlh_m_store_rate(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct platform_device *pdev = to_platform_device(dev); + struct lsm303dlh_m_data *ddata = platform_get_drvdata(pdev); + unsigned long val; + unsigned char data; + int error; + + error = strict_strtoul(buf, 0, &val); + if (error) + return error; + + mutex_lock(&ddata->lock); + if (ddata->mode == LSM303DLH_M_MODE_SLEEP) { + dev_info(&ddata->client->dev, + "device is switched off,make it ON using MODE"); + mutex_unlock(&ddata->lock); + return count; + } + + data = ((val << LSM303DLH_M_CRA_DO_BIT) & LSM303DLH_M_CRA_DO_MASK); + ddata->rate = data; + + error = lsm303dlh_m_write(ddata, CRA_REG_M, data, "SET RATE"); + + if (error < 0) { + mutex_unlock(&ddata->lock); + return error; + } + + mutex_unlock(&ddata->lock); + + return count; +} + +static int lsm303dlh_m_xyz_read(struct lsm303dlh_m_data *ddata) +{ + unsigned char xyz_data[6]; + short temp; + int ret = lsm303dlh_m_read_multi(ddata, OUT_X_M, + 6, xyz_data, "OUT_X_M"); + if (ret < 0) + return -EINVAL; + + /* MSB is at lower address */ + ddata->data[0] = (short) + (((xyz_data[0]) << 8) | xyz_data[1]); + ddata->data[1] = (short) + (((xyz_data[2]) << 8) | xyz_data[3]); + ddata->data[2] = (short) + (((xyz_data[4]) << 8) | xyz_data[5]); + + /* check if chip is DHLC */ + if (ddata->pdata.chip_id == LSM303DLHC_CHIP_ID) { + /* + * the out registers are in x, z and y order + * so swap y and z values + */ + temp = ddata->data[1]; + ddata->data[1] = ddata->data[2]; + ddata->data[2] = temp; + } + /* taking orientation of x,y,z axis into account*/ + + ddata->data[ddata->pdata.axis_map_x] = ddata->pdata.negative_x ? + -ddata->data[ddata->pdata.axis_map_x] : + ddata->data[ddata->pdata.axis_map_x]; + ddata->data[ddata->pdata.axis_map_y] = ddata->pdata.negative_y ? + -ddata->data[ddata->pdata.axis_map_y] : + ddata->data[ddata->pdata.axis_map_y]; + ddata->data[ddata->pdata.axis_map_z] = ddata->pdata.negative_z ? + -ddata->data[ddata->pdata.axis_map_z] : + ddata->data[ddata->pdata.axis_map_z]; + + return ret; +} + +static ssize_t lsm303dlh_m_gain(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct platform_device *pdev = to_platform_device(dev); + struct lsm303dlh_m_data *ddata = platform_get_drvdata(pdev); + + return sprintf(buf, "%8x:%8x:%8x\n", + ddata->gain[ddata->pdata.axis_map_x], + ddata->gain[ddata->pdata.axis_map_y], + ddata->gain[ddata->pdata.axis_map_z]); +} + +static ssize_t lsm303dlh_m_values(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct platform_device *pdev = to_platform_device(dev); + struct lsm303dlh_m_data *ddata = platform_get_drvdata(pdev); + int ret = 0; + + mutex_lock(&ddata->lock); + + if (ddata->mode == LSM303DLH_M_MODE_SLEEP || + ddata->device_status == DEVICE_SUSPENDED) { + mutex_unlock(&ddata->lock); + return ret; + } + + ret = lsm303dlh_m_xyz_read(ddata); + + if (ret < 0) { + mutex_unlock(&ddata->lock); + return -EINVAL; + } + + mutex_unlock(&ddata->lock); + + /* taking orientation of x,y,z axis into account*/ + + return sprintf(buf, "%8x:%8x:%8x\n", + ddata->data[ddata->pdata.axis_map_x], + ddata->data[ddata->pdata.axis_map_y], + ddata->data[ddata->pdata.axis_map_z]); +} + +static int lsm303dlh_m_set_mode(struct lsm303dlh_m_data *ddata, + unsigned char mode) +{ + int ret; + + mode = (mode << LSM303DLH_M_MR_MD_BIT); + + ret = i2c_smbus_write_byte_data(ddata->client, MR_REG_M, mode); + + if (ret < 0) + dev_err(&ddata->client->dev, + "i2c_smbus_write_byte_data failed error %d\ + Register (%s)\n", ret, "MODE CONTROL"); + + return ret; +} + +#ifdef CONFIG_SENSORS_LSM303DLH_INPUT_DEVICE + +static irqreturn_t lsm303dlh_m_gpio_irq(int irq, void *device_data) +{ + struct lsm303dlh_m_data *ddata = device_data; + int ret; + + ret = lsm303dlh_m_xyz_read(ddata); + + if (ret < 0) { + dev_err(&ddata->client->dev, + "reading data of xyz failed error %d\n", ret); + return IRQ_NONE; + } + + /* taking orientation of x,y,z axis into account*/ + + input_report_abs(ddata->input_dev, ABS_X, + ddata->data[ddata->pdata.axis_map_x]); + input_report_abs(ddata->input_dev, ABS_Y, + ddata->data[ddata->pdata.axis_map_y]); + input_report_abs(ddata->input_dev, ABS_Z, + ddata->data[ddata->pdata.axis_map_z]); + input_sync(ddata->input_dev); + + return IRQ_HANDLED; + +} +#endif + +static ssize_t lsm303dlh_m_show_range(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct platform_device *pdev = to_platform_device(dev); + struct lsm303dlh_m_data *ddata = platform_get_drvdata(pdev); + + return sprintf(buf, "%d\n", ddata->range >> LSM303DLH_M_CRB_GN_BIT); +} + +static ssize_t lsm303dlh_m_store_range(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct platform_device *pdev = to_platform_device(dev); + struct lsm303dlh_m_data *ddata = platform_get_drvdata(pdev); + short xy_gain; + short z_gain; + unsigned long range; + int error; + + error = strict_strtoul(buf, 0, &range); + + if (error) + return error; + + mutex_lock(&ddata->lock); + + if (ddata->mode == LSM303DLH_M_MODE_SLEEP) { + dev_info(&ddata->client->dev, + "device is switched off,make it ON using MODE"); + mutex_unlock(&ddata->lock); + return count; + } + + switch (range) { + case LSM303DLH_M_RANGE_1_3G: + xy_gain = XY_GAIN_1_3; + z_gain = Z_GAIN_1_3; + break; + case LSM303DLH_M_RANGE_1_9G: + xy_gain = XY_GAIN_1_9; + z_gain = Z_GAIN_1_9; + break; + case LSM303DLH_M_RANGE_2_5G: + xy_gain = XY_GAIN_2_5; + z_gain = Z_GAIN_2_5; + break; + case LSM303DLH_M_RANGE_4_0G: + xy_gain = XY_GAIN_4_0; + z_gain = Z_GAIN_4_0; + break; + case LSM303DLH_M_RANGE_4_7G: + xy_gain = XY_GAIN_4_7; + z_gain = Z_GAIN_4_7; + break; + case LSM303DLH_M_RANGE_5_6G: + xy_gain = XY_GAIN_5_6; + z_gain = Z_GAIN_5_6; + break; + case LSM303DLH_M_RANGE_8_1G: + xy_gain = XY_GAIN_8_1; + z_gain = Z_GAIN_8_1; + break; + default: + mutex_unlock(&ddata->lock); + return -EINVAL; + } + + ddata->gain[ddata->pdata.axis_map_x] = xy_gain; + ddata->gain[ddata->pdata.axis_map_y] = xy_gain; + ddata->gain[ddata->pdata.axis_map_z] = z_gain; + + range <<= LSM303DLH_M_CRB_GN_BIT; + range &= LSM303DLH_M_CRB_GN_MASK; + + ddata->range = range; + + error = lsm303dlh_m_write(ddata, CRB_REG_M, range, "SET RANGE"); + mutex_unlock(&ddata->lock); + + if (error < 0) + return error; + + return count; +} + +static ssize_t lsm303dlh_m_show_mode(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct platform_device *pdev = to_platform_device(dev); + struct lsm303dlh_m_data *ddata = platform_get_drvdata(pdev); + + return sprintf(buf, "%d\n", ddata->mode); +} + +static ssize_t lsm303dlh_m_store_mode(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct platform_device *pdev = to_platform_device(dev); + struct lsm303dlh_m_data *ddata = platform_get_drvdata(pdev); + unsigned long mode; + int error; + + error = strict_strtoul(buf, 0, &mode); + if (error) + return error; + + mutex_lock(&ddata->lock); + + if (ddata->device_status == DEVICE_SUSPENDED && + mode == LSM303DLH_M_MODE_SLEEP) { + ddata->mode = (mode >> LSM303DLH_M_MR_MD_BIT); + mutex_unlock(&ddata->lock); + return count; + } + + /* if same mode as existing, return */ + if (ddata->mode == mode) { + mutex_unlock(&ddata->lock); + return count; + } + + /* turn on the supplies if already off */ + if (ddata->mode == LSM303DLH_M_MODE_SLEEP && ddata->regulator + && (ddata->device_status == DEVICE_OFF + || ddata->device_status == DEVICE_SUSPENDED)) { + regulator_enable(ddata->regulator); + ddata->device_status = DEVICE_ON; + +#ifdef CONFIG_SENSORS_LSM303DLH_INPUT_DEVICE + enable_irq(gpio_to_irq(ddata->pdata.irq_m)); +#endif + } + + error = lsm303dlh_m_set_mode(ddata, mode); + + ddata->mode = (mode >> LSM303DLH_M_MR_MD_BIT); + if (error < 0) { + if (ddata->regulator && ddata->device_status == DEVICE_ON) { + regulator_disable(ddata->regulator); + ddata->device_status = DEVICE_OFF; + } + mutex_unlock(&ddata->lock); + return error; + } + + if (mode == LSM303DLH_M_MODE_SLEEP) { + +#ifdef CONFIG_SENSORS_LSM303DLH_INPUT_DEVICE + disable_irq(gpio_to_irq(ddata->pdata.irq_m)); +#endif + + /* + * No need to store context here, it is not like + * suspend/resume but fall back to default values + */ + ddata->rate = LSM303DLH_M_RATE_00_75; + ddata->range = LSM303DLH_M_RANGE_1_3G; + ddata->range <<= LSM303DLH_M_CRB_GN_BIT; + ddata->range &= LSM303DLH_M_CRB_GN_MASK; + ddata->gain[ddata->pdata.axis_map_x] = XY_GAIN_1_3; + ddata->gain[ddata->pdata.axis_map_y] = XY_GAIN_1_3; + ddata->gain[ddata->pdata.axis_map_z] = Z_GAIN_1_3; + + if (ddata->regulator && ddata->device_status == DEVICE_ON) { + regulator_disable(ddata->regulator); + ddata->device_status = DEVICE_OFF; + } + } + mutex_unlock(&ddata->lock); + + return count; +} + +static DEVICE_ATTR(gain, S_IRUGO, lsm303dlh_m_gain, NULL); + +static DEVICE_ATTR(data, S_IRUGO, lsm303dlh_m_values, NULL); + +static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, + lsm303dlh_m_show_mode, lsm303dlh_m_store_mode); + +static DEVICE_ATTR(range, S_IWUSR | S_IRUGO, + lsm303dlh_m_show_range, lsm303dlh_m_store_range); + +static DEVICE_ATTR(rate, S_IWUSR | S_IRUGO, + lsm303dlh_m_show_rate, lsm303dlh_m_store_rate); + +static struct attribute *lsm303dlh_m_attributes[] = { + &dev_attr_gain.attr, + &dev_attr_data.attr, + &dev_attr_mode.attr, + &dev_attr_range.attr, + &dev_attr_rate.attr, + NULL +}; + +static const struct attribute_group lsm303dlh_m_attr_group = { + .attrs = lsm303dlh_m_attributes, +}; + +static int __devinit lsm303dlh_m_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret; + struct lsm303dlh_m_data *ddata = NULL; + unsigned char version[3]; + + ddata = kzalloc(sizeof(struct lsm303dlh_m_data), GFP_KERNEL); + if (ddata == NULL) { + dev_err(&client->dev, "memory alocation failed\n"); + ret = -ENOMEM; + goto err_alloc; + } + + ddata->client = client; + i2c_set_clientdata(client, ddata); + + /* copy platform specific data */ + memcpy(&ddata->pdata, client->dev.platform_data, sizeof(ddata->pdata)); + + ddata->mode = LSM303DLH_M_MODE_SLEEP; + ddata->rate = LSM303DLH_M_RATE_00_75; + ddata->range = LSM303DLH_M_RANGE_1_3G; + ddata->range <<= LSM303DLH_M_CRB_GN_BIT; + ddata->range &= LSM303DLH_M_CRB_GN_MASK; + ddata->gain[ddata->pdata.axis_map_x] = XY_GAIN_1_3; + ddata->gain[ddata->pdata.axis_map_y] = XY_GAIN_1_3; + ddata->gain[ddata->pdata.axis_map_z] = Z_GAIN_1_3; + ddata->device_status = DEVICE_OFF; + dev_set_name(&client->dev, ddata->pdata.name_m); + + ddata->regulator = regulator_get(&client->dev, "vdd"); + if (IS_ERR(ddata->regulator)) { + dev_err(&client->dev, "failed to get regulator\n"); + ret = PTR_ERR(ddata->regulator); + ddata->regulator = NULL; + goto err_op_failed; + } + + if (ddata->regulator) { + /* + * 0.83 milliamps typical with magnetic sensor setting ODR = + * 7.5 Hz, Accelerometer sensor ODR = 50 Hz. Double for + * safety. + */ + regulator_set_optimum_mode(ddata->regulator, 830 * 2); + regulator_enable(ddata->regulator); + ddata->device_status = DEVICE_ON; + } + + ret = lsm303dlh_m_read_multi(ddata, IRA_REG_M, 3, version, "IRA_REG_M"); + if (ret < 0) + goto exit_free_regulator; + + dev_info(&client->dev, "Magnetometer, ID : %x:%x:%x", + version[0], version[1], version[2]); + + mutex_init(&ddata->lock); + + ret = sysfs_create_group(&client->dev.kobj, &lsm303dlh_m_attr_group); + if (ret) + goto exit_free_regulator; + +#ifdef CONFIG_SENSORS_LSM303DLH_INPUT_DEVICE + + ddata->input_dev = input_allocate_device(); + if (!ddata->input_dev) { + ret = -ENOMEM; + dev_err(&client->dev, "Failed to allocate input device\n"); + goto exit_free_regulator; + } + + set_bit(EV_ABS, ddata->input_dev->evbit); + + /* x-axis acceleration */ + input_set_abs_params(ddata->input_dev, ABS_X, -32768, 32767, 0, 0); + /* y-axis acceleration */ + input_set_abs_params(ddata->input_dev, ABS_Y, -32768, 32767, 0, 0); + /* z-axis acceleration */ + input_set_abs_params(ddata->input_dev, ABS_Z, -32768, 32767, 0, 0); + + ddata->input_dev->name = "magnetometer"; + + ret = input_register_device(ddata->input_dev); + if (ret) { + dev_err(&client->dev, "Unable to register input device: %s\n", + ddata->input_dev->name); + goto err_input_register_failed; + } + + /* register interrupt */ + ret = request_threaded_irq(gpio_to_irq(ddata->pdata.irq_m), NULL, + lsm303dlh_m_gpio_irq, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, "lsm303dlh_m", + ddata); + if (ret) { + dev_err(&client->dev, "request irq EGPIO_PIN_1 failed\n"); + goto err_input_failed; + } + + disable_irq(gpio_to_irq(ddata->pdata.irq_m)); +#endif + +#ifdef CONFIG_HAS_EARLYSUSPEND + ddata->early_suspend.level = + EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1; + ddata->early_suspend.suspend = lsm303dlh_m_early_suspend; + ddata->early_suspend.resume = lsm303dlh_m_late_resume; + register_early_suspend(&ddata->early_suspend); +#endif + + if (ddata->device_status == DEVICE_ON && ddata->regulator) { + regulator_disable(ddata->regulator); + ddata->device_status = DEVICE_OFF; + } + + return ret; + +#ifdef CONFIG_SENSORS_LSM303DLH_INPUT_DEVICE +err_input_failed: + input_unregister_device(ddata->input_dev); +err_input_register_failed: + input_free_device(ddata->input_dev); +#endif +exit_free_regulator: + if (ddata->device_status == DEVICE_ON && ddata->regulator) { + regulator_disable(ddata->regulator); + regulator_put(ddata->regulator); + ddata->device_status = DEVICE_OFF; + } + +err_op_failed: + kfree(ddata); +err_alloc: + dev_err(&client->dev, "lsm303dlh_m_probe failed %x", ret); + return ret; +} + +static int __devexit lsm303dlh_m_remove(struct i2c_client *client) +{ + struct lsm303dlh_m_data *ddata; + + ddata = i2c_get_clientdata(client); + +#ifdef CONFIG_SENSORS_LSM303DLH_INPUT_DEVICE + input_unregister_device(ddata->input_dev); + input_free_device(ddata->input_dev); +#endif + + sysfs_remove_group(&client->dev.kobj, &lsm303dlh_m_attr_group); + + /* safer to make device off */ + if (ddata->mode != LSM303DLH_M_MODE_SLEEP) { + lsm303dlh_m_set_mode(ddata, LSM303DLH_M_MODE_SLEEP); + if (ddata->regulator && ddata->device_status == DEVICE_ON) { + regulator_disable(ddata->regulator); + regulator_put(ddata->regulator); + ddata->device_status = DEVICE_OFF; + } + } + + i2c_set_clientdata(client, NULL); + kfree(ddata); + + return 0; +} + +#ifndef CONFIG_HAS_EARLYSUSPEND +#ifdef CONFIG_PM +static int lsm303dlh_m_suspend(struct device *dev) +{ + struct lsm303dlh_m_data *ddata; + int ret; + + ddata = dev_get_drvdata(dev); + + ret = lsm303dlh_m_do_suspend(ddata); + if (ret < 0) + dev_err(&ddata->client->dev, + "Error while suspending the device"); + + return ret; +} + +static int lsm303dlh_m_resume(struct device *dev) +{ + struct lsm303dlh_m_data *ddata; + int ret; + + ddata = dev_get_drvdata(dev); + + ret = lsm303dlh_m_restore(ddata); + + if (ret < 0) + dev_err(&ddata->client->dev, + "Error while resuming the device"); + + return ret; +} +static const struct dev_pm_ops lsm303dlh_m_dev_pm_ops = { + .suspend = lsm303dlh_m_suspend, + .resume = lsm303dlh_m_resume, +}; +#endif +#else +static void lsm303dlh_m_early_suspend(struct early_suspend *data) +{ + struct lsm303dlh_m_data *ddata = + container_of(data, struct lsm303dlh_m_data, early_suspend); + int ret; + + ret = lsm303dlh_m_do_suspend(ddata); + if (ret < 0) + dev_err(&ddata->client->dev, + "Error while suspending the device"); +} + +static void lsm303dlh_m_late_resume(struct early_suspend *data) +{ + struct lsm303dlh_m_data *ddata = + container_of(data, struct lsm303dlh_m_data, early_suspend); + int ret; + + ret = lsm303dlh_m_restore(ddata); + + if (ret < 0) + dev_err(&ddata->client->dev, + "lsm303dlh_m late resume failed\n"); +} +#endif /* CONFIG_PM */ + +static const struct i2c_device_id lsm303dlh_m_id[] = { + { "lsm303dlh_m", 0 }, + { }, +}; + +static struct i2c_driver lsm303dlh_m_driver = { + .probe = lsm303dlh_m_probe, + .remove = lsm303dlh_m_remove, + .id_table = lsm303dlh_m_id, + .driver = { + .name = "lsm303dlh_m", +#if (!defined(CONFIG_HAS_EARLYSUSPEND) && defined(CONFIG_PM)) + .pm = &lsm303dlh_m_dev_pm_ops, +#endif + }, +}; + +static int __init lsm303dlh_m_init(void) +{ + return i2c_add_driver(&lsm303dlh_m_driver); +} + +static void __exit lsm303dlh_m_exit(void) +{ + i2c_del_driver(&lsm303dlh_m_driver); +} + +module_init(lsm303dlh_m_init); +module_exit(lsm303dlh_m_exit); + +MODULE_DESCRIPTION("lSM303DLH 3-Axis Magnetometer Driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("STMicroelectronics"); |