![Irina Tirdea](/assets/img/avatar_default.png)
Use const char* instead of casting const char* to char*. Signed-off-by: Irina Tirdea <irina.tirdea@intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
602 lines
15 KiB
C
602 lines
15 KiB
C
/*
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* A sensor driver for the magnetometer AK8975.
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*
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* Magnetic compass sensor driver for monitoring magnetic flux information.
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*
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* Copyright (c) 2010, NVIDIA Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/delay.h>
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#include <linux/bitops.h>
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#include <linux/gpio.h>
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#include <linux/of_gpio.h>
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#include <linux/acpi.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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/*
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* Register definitions, as well as various shifts and masks to get at the
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* individual fields of the registers.
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*/
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#define AK8975_REG_WIA 0x00
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#define AK8975_DEVICE_ID 0x48
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#define AK8975_REG_INFO 0x01
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#define AK8975_REG_ST1 0x02
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#define AK8975_REG_ST1_DRDY_SHIFT 0
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#define AK8975_REG_ST1_DRDY_MASK (1 << AK8975_REG_ST1_DRDY_SHIFT)
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#define AK8975_REG_HXL 0x03
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#define AK8975_REG_HXH 0x04
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#define AK8975_REG_HYL 0x05
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#define AK8975_REG_HYH 0x06
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#define AK8975_REG_HZL 0x07
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#define AK8975_REG_HZH 0x08
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#define AK8975_REG_ST2 0x09
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#define AK8975_REG_ST2_DERR_SHIFT 2
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#define AK8975_REG_ST2_DERR_MASK (1 << AK8975_REG_ST2_DERR_SHIFT)
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#define AK8975_REG_ST2_HOFL_SHIFT 3
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#define AK8975_REG_ST2_HOFL_MASK (1 << AK8975_REG_ST2_HOFL_SHIFT)
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#define AK8975_REG_CNTL 0x0A
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#define AK8975_REG_CNTL_MODE_SHIFT 0
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#define AK8975_REG_CNTL_MODE_MASK (0xF << AK8975_REG_CNTL_MODE_SHIFT)
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#define AK8975_REG_CNTL_MODE_POWER_DOWN 0
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#define AK8975_REG_CNTL_MODE_ONCE 1
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#define AK8975_REG_CNTL_MODE_SELF_TEST 8
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#define AK8975_REG_CNTL_MODE_FUSE_ROM 0xF
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#define AK8975_REG_RSVC 0x0B
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#define AK8975_REG_ASTC 0x0C
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#define AK8975_REG_TS1 0x0D
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#define AK8975_REG_TS2 0x0E
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#define AK8975_REG_I2CDIS 0x0F
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#define AK8975_REG_ASAX 0x10
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#define AK8975_REG_ASAY 0x11
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#define AK8975_REG_ASAZ 0x12
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#define AK8975_MAX_REGS AK8975_REG_ASAZ
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/*
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* Miscellaneous values.
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*/
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#define AK8975_MAX_CONVERSION_TIMEOUT 500
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#define AK8975_CONVERSION_DONE_POLL_TIME 10
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#define AK8975_DATA_READY_TIMEOUT ((100*HZ)/1000)
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#define RAW_TO_GAUSS_8975(asa) ((((asa) + 128) * 3000) / 256)
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#define RAW_TO_GAUSS_8963(asa) ((((asa) + 128) * 6000) / 256)
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/* Compatible Asahi Kasei Compass parts */
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enum asahi_compass_chipset {
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AK8975,
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AK8963,
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};
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/*
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* Per-instance context data for the device.
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*/
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struct ak8975_data {
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struct i2c_client *client;
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struct attribute_group attrs;
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struct mutex lock;
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u8 asa[3];
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long raw_to_gauss[3];
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u8 reg_cache[AK8975_MAX_REGS];
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int eoc_gpio;
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int eoc_irq;
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wait_queue_head_t data_ready_queue;
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unsigned long flags;
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enum asahi_compass_chipset chipset;
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};
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static const int ak8975_index_to_reg[] = {
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AK8975_REG_HXL, AK8975_REG_HYL, AK8975_REG_HZL,
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};
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/*
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* Helper function to write to the I2C device's registers.
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*/
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static int ak8975_write_data(struct i2c_client *client,
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u8 reg, u8 val, u8 mask, u8 shift)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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struct ak8975_data *data = iio_priv(indio_dev);
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u8 regval;
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int ret;
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regval = (data->reg_cache[reg] & ~mask) | (val << shift);
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ret = i2c_smbus_write_byte_data(client, reg, regval);
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if (ret < 0) {
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dev_err(&client->dev, "Write to device fails status %x\n", ret);
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return ret;
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}
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data->reg_cache[reg] = regval;
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return 0;
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}
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/*
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* Handle data ready irq
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*/
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static irqreturn_t ak8975_irq_handler(int irq, void *data)
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{
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struct ak8975_data *ak8975 = data;
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set_bit(0, &ak8975->flags);
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wake_up(&ak8975->data_ready_queue);
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return IRQ_HANDLED;
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}
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/*
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* Install data ready interrupt handler
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*/
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static int ak8975_setup_irq(struct ak8975_data *data)
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{
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struct i2c_client *client = data->client;
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int rc;
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int irq;
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if (client->irq)
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irq = client->irq;
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else
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irq = gpio_to_irq(data->eoc_gpio);
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rc = devm_request_irq(&client->dev, irq, ak8975_irq_handler,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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dev_name(&client->dev), data);
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if (rc < 0) {
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dev_err(&client->dev,
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"irq %d request failed, (gpio %d): %d\n",
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irq, data->eoc_gpio, rc);
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return rc;
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}
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init_waitqueue_head(&data->data_ready_queue);
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clear_bit(0, &data->flags);
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data->eoc_irq = irq;
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return rc;
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}
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/*
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* Perform some start-of-day setup, including reading the asa calibration
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* values and caching them.
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*/
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static int ak8975_setup(struct i2c_client *client)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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struct ak8975_data *data = iio_priv(indio_dev);
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u8 device_id;
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int ret;
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/* Confirm that the device we're talking to is really an AK8975. */
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ret = i2c_smbus_read_byte_data(client, AK8975_REG_WIA);
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if (ret < 0) {
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dev_err(&client->dev, "Error reading WIA\n");
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return ret;
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}
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device_id = ret;
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if (device_id != AK8975_DEVICE_ID) {
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dev_err(&client->dev, "Device ak8975 not found\n");
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return -ENODEV;
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}
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/* Write the fused rom access mode. */
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ret = ak8975_write_data(client,
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AK8975_REG_CNTL,
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AK8975_REG_CNTL_MODE_FUSE_ROM,
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AK8975_REG_CNTL_MODE_MASK,
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AK8975_REG_CNTL_MODE_SHIFT);
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if (ret < 0) {
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dev_err(&client->dev, "Error in setting fuse access mode\n");
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return ret;
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}
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/* Get asa data and store in the device data. */
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ret = i2c_smbus_read_i2c_block_data(client, AK8975_REG_ASAX,
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3, data->asa);
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if (ret < 0) {
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dev_err(&client->dev, "Not able to read asa data\n");
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return ret;
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}
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/* After reading fuse ROM data set power-down mode */
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ret = ak8975_write_data(client,
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AK8975_REG_CNTL,
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AK8975_REG_CNTL_MODE_POWER_DOWN,
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AK8975_REG_CNTL_MODE_MASK,
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AK8975_REG_CNTL_MODE_SHIFT);
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if (data->eoc_gpio > 0 || client->irq) {
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ret = ak8975_setup_irq(data);
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if (ret < 0) {
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dev_err(&client->dev,
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"Error setting data ready interrupt\n");
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return ret;
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}
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}
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if (ret < 0) {
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dev_err(&client->dev, "Error in setting power-down mode\n");
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return ret;
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}
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/*
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* Precalculate scale factor (in Gauss units) for each axis and
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* store in the device data.
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*
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* This scale factor is axis-dependent, and is derived from 3 calibration
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* factors ASA(x), ASA(y), and ASA(z).
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*
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* These ASA values are read from the sensor device at start of day, and
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* cached in the device context struct.
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*
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* Adjusting the flux value with the sensitivity adjustment value should be
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* done via the following formula:
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*
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* Hadj = H * ( ( ( (ASA-128)*0.5 ) / 128 ) + 1 )
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*
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* where H is the raw value, ASA is the sensitivity adjustment, and Hadj
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* is the resultant adjusted value.
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*
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* We reduce the formula to:
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*
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* Hadj = H * (ASA + 128) / 256
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*
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* H is in the range of -4096 to 4095. The magnetometer has a range of
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* +-1229uT. To go from the raw value to uT is:
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*
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* HuT = H * 1229/4096, or roughly, 3/10.
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*
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* Since 1uT = 0.01 gauss, our final scale factor becomes:
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*
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* Hadj = H * ((ASA + 128) / 256) * 3/10 * 1/100
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* Hadj = H * ((ASA + 128) * 0.003) / 256
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*
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* Since ASA doesn't change, we cache the resultant scale factor into the
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* device context in ak8975_setup().
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*/
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if (data->chipset == AK8963) {
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/*
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* H range is +-8190 and magnetometer range is +-4912.
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* So HuT using the above explanation for 8975,
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* 4912/8190 = ~ 6/10.
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* So the Hadj should use 6/10 instead of 3/10.
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*/
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data->raw_to_gauss[0] = RAW_TO_GAUSS_8963(data->asa[0]);
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data->raw_to_gauss[1] = RAW_TO_GAUSS_8963(data->asa[1]);
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data->raw_to_gauss[2] = RAW_TO_GAUSS_8963(data->asa[2]);
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} else {
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data->raw_to_gauss[0] = RAW_TO_GAUSS_8975(data->asa[0]);
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data->raw_to_gauss[1] = RAW_TO_GAUSS_8975(data->asa[1]);
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data->raw_to_gauss[2] = RAW_TO_GAUSS_8975(data->asa[2]);
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}
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return 0;
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}
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static int wait_conversion_complete_gpio(struct ak8975_data *data)
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{
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struct i2c_client *client = data->client;
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u32 timeout_ms = AK8975_MAX_CONVERSION_TIMEOUT;
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int ret;
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/* Wait for the conversion to complete. */
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while (timeout_ms) {
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msleep(AK8975_CONVERSION_DONE_POLL_TIME);
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if (gpio_get_value(data->eoc_gpio))
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break;
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timeout_ms -= AK8975_CONVERSION_DONE_POLL_TIME;
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}
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if (!timeout_ms) {
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dev_err(&client->dev, "Conversion timeout happened\n");
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return -EINVAL;
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}
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ret = i2c_smbus_read_byte_data(client, AK8975_REG_ST1);
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if (ret < 0)
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dev_err(&client->dev, "Error in reading ST1\n");
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return ret;
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}
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static int wait_conversion_complete_polled(struct ak8975_data *data)
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{
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struct i2c_client *client = data->client;
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u8 read_status;
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u32 timeout_ms = AK8975_MAX_CONVERSION_TIMEOUT;
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int ret;
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/* Wait for the conversion to complete. */
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while (timeout_ms) {
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msleep(AK8975_CONVERSION_DONE_POLL_TIME);
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ret = i2c_smbus_read_byte_data(client, AK8975_REG_ST1);
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if (ret < 0) {
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dev_err(&client->dev, "Error in reading ST1\n");
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return ret;
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}
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read_status = ret;
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if (read_status)
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break;
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timeout_ms -= AK8975_CONVERSION_DONE_POLL_TIME;
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}
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if (!timeout_ms) {
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dev_err(&client->dev, "Conversion timeout happened\n");
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return -EINVAL;
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}
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return read_status;
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}
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/* Returns 0 if the end of conversion interrupt occured or -ETIME otherwise */
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static int wait_conversion_complete_interrupt(struct ak8975_data *data)
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{
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int ret;
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ret = wait_event_timeout(data->data_ready_queue,
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test_bit(0, &data->flags),
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AK8975_DATA_READY_TIMEOUT);
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clear_bit(0, &data->flags);
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return ret > 0 ? 0 : -ETIME;
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}
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/*
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* Emits the raw flux value for the x, y, or z axis.
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*/
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static int ak8975_read_axis(struct iio_dev *indio_dev, int index, int *val)
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{
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struct ak8975_data *data = iio_priv(indio_dev);
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struct i2c_client *client = data->client;
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int ret;
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mutex_lock(&data->lock);
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/* Set up the device for taking a sample. */
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ret = ak8975_write_data(client,
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AK8975_REG_CNTL,
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AK8975_REG_CNTL_MODE_ONCE,
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AK8975_REG_CNTL_MODE_MASK,
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AK8975_REG_CNTL_MODE_SHIFT);
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if (ret < 0) {
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dev_err(&client->dev, "Error in setting operating mode\n");
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goto exit;
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}
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/* Wait for the conversion to complete. */
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if (data->eoc_irq)
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ret = wait_conversion_complete_interrupt(data);
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else if (gpio_is_valid(data->eoc_gpio))
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ret = wait_conversion_complete_gpio(data);
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else
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ret = wait_conversion_complete_polled(data);
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if (ret < 0)
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goto exit;
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/* This will be executed only for non-interrupt based waiting case */
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if (ret & AK8975_REG_ST1_DRDY_MASK) {
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ret = i2c_smbus_read_byte_data(client, AK8975_REG_ST2);
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if (ret < 0) {
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dev_err(&client->dev, "Error in reading ST2\n");
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goto exit;
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}
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if (ret & (AK8975_REG_ST2_DERR_MASK |
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AK8975_REG_ST2_HOFL_MASK)) {
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dev_err(&client->dev, "ST2 status error 0x%x\n", ret);
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ret = -EINVAL;
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goto exit;
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}
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}
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/* Read the flux value from the appropriate register
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(the register is specified in the iio device attributes). */
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ret = i2c_smbus_read_word_data(client, ak8975_index_to_reg[index]);
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if (ret < 0) {
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dev_err(&client->dev, "Read axis data fails\n");
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goto exit;
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}
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mutex_unlock(&data->lock);
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/* Clamp to valid range. */
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*val = clamp_t(s16, ret, -4096, 4095);
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return IIO_VAL_INT;
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exit:
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mutex_unlock(&data->lock);
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return ret;
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}
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static int ak8975_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2,
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long mask)
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{
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struct ak8975_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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return ak8975_read_axis(indio_dev, chan->address, val);
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case IIO_CHAN_INFO_SCALE:
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*val = 0;
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*val2 = data->raw_to_gauss[chan->address];
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return IIO_VAL_INT_PLUS_MICRO;
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}
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return -EINVAL;
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}
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#define AK8975_CHANNEL(axis, index) \
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{ \
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.type = IIO_MAGN, \
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.modified = 1, \
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.channel2 = IIO_MOD_##axis, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
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BIT(IIO_CHAN_INFO_SCALE), \
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.address = index, \
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}
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static const struct iio_chan_spec ak8975_channels[] = {
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AK8975_CHANNEL(X, 0), AK8975_CHANNEL(Y, 1), AK8975_CHANNEL(Z, 2),
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};
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static const struct iio_info ak8975_info = {
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.read_raw = &ak8975_read_raw,
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.driver_module = THIS_MODULE,
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};
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static const struct acpi_device_id ak_acpi_match[] = {
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{"AK8975", AK8975},
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{"AK8963", AK8963},
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{"INVN6500", AK8963},
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{ },
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};
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MODULE_DEVICE_TABLE(acpi, ak_acpi_match);
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static const char *ak8975_match_acpi_device(struct device *dev,
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enum asahi_compass_chipset *chipset)
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{
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const struct acpi_device_id *id;
|
|
|
|
id = acpi_match_device(dev->driver->acpi_match_table, dev);
|
|
if (!id)
|
|
return NULL;
|
|
*chipset = (int)id->driver_data;
|
|
|
|
return dev_name(dev);
|
|
}
|
|
|
|
static int ak8975_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct ak8975_data *data;
|
|
struct iio_dev *indio_dev;
|
|
int eoc_gpio;
|
|
int err;
|
|
const char *name = NULL;
|
|
|
|
/* Grab and set up the supplied GPIO. */
|
|
if (client->dev.platform_data)
|
|
eoc_gpio = *(int *)(client->dev.platform_data);
|
|
else if (client->dev.of_node)
|
|
eoc_gpio = of_get_gpio(client->dev.of_node, 0);
|
|
else
|
|
eoc_gpio = -1;
|
|
|
|
if (eoc_gpio == -EPROBE_DEFER)
|
|
return -EPROBE_DEFER;
|
|
|
|
/* We may not have a GPIO based IRQ to scan, that is fine, we will
|
|
poll if so */
|
|
if (gpio_is_valid(eoc_gpio)) {
|
|
err = devm_gpio_request_one(&client->dev, eoc_gpio,
|
|
GPIOF_IN, "ak_8975");
|
|
if (err < 0) {
|
|
dev_err(&client->dev,
|
|
"failed to request GPIO %d, error %d\n",
|
|
eoc_gpio, err);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
/* Register with IIO */
|
|
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
|
|
if (indio_dev == NULL)
|
|
return -ENOMEM;
|
|
|
|
data = iio_priv(indio_dev);
|
|
i2c_set_clientdata(client, indio_dev);
|
|
|
|
data->client = client;
|
|
data->eoc_gpio = eoc_gpio;
|
|
data->eoc_irq = 0;
|
|
|
|
/* id will be NULL when enumerated via ACPI */
|
|
if (id) {
|
|
data->chipset =
|
|
(enum asahi_compass_chipset)(id->driver_data);
|
|
name = id->name;
|
|
} else if (ACPI_HANDLE(&client->dev))
|
|
name = ak8975_match_acpi_device(&client->dev, &data->chipset);
|
|
else
|
|
return -ENOSYS;
|
|
|
|
dev_dbg(&client->dev, "Asahi compass chip %s\n", name);
|
|
|
|
/* Perform some basic start-of-day setup of the device. */
|
|
err = ak8975_setup(client);
|
|
if (err < 0) {
|
|
dev_err(&client->dev, "AK8975 initialization fails\n");
|
|
return err;
|
|
}
|
|
|
|
data->client = client;
|
|
mutex_init(&data->lock);
|
|
data->eoc_gpio = eoc_gpio;
|
|
indio_dev->dev.parent = &client->dev;
|
|
indio_dev->channels = ak8975_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(ak8975_channels);
|
|
indio_dev->info = &ak8975_info;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->name = name;
|
|
err = devm_iio_device_register(&client->dev, indio_dev);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id ak8975_id[] = {
|
|
{"ak8975", AK8975},
|
|
{"ak8963", AK8963},
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, ak8975_id);
|
|
|
|
static const struct of_device_id ak8975_of_match[] = {
|
|
{ .compatible = "asahi-kasei,ak8975", },
|
|
{ .compatible = "ak8975", },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ak8975_of_match);
|
|
|
|
static struct i2c_driver ak8975_driver = {
|
|
.driver = {
|
|
.name = "ak8975",
|
|
.of_match_table = ak8975_of_match,
|
|
.acpi_match_table = ACPI_PTR(ak_acpi_match),
|
|
},
|
|
.probe = ak8975_probe,
|
|
.id_table = ak8975_id,
|
|
};
|
|
module_i2c_driver(ak8975_driver);
|
|
|
|
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
|
|
MODULE_DESCRIPTION("AK8975 magnetometer driver");
|
|
MODULE_LICENSE("GPL");
|