--- /dev/null
+/*
+ * Freescale MMA9551L Intelligent Motion-Sensing Platform driver
+ * Copyright (c) 2014, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/events.h>
+
+#define MMA9551_DRV_NAME "mma9551"
+#define MMA9551_IRQ_NAME "mma9551_event"
+#define MMA9551_GPIO_NAME "mma9551_int"
+#define MMA9551_GPIO_COUNT 4
+
+/* Applications IDs */
+#define MMA9551_APPID_VERSION 0x00
+#define MMA9551_APPID_GPIO 0x03
+#define MMA9551_APPID_AFE 0x06
+#define MMA9551_APPID_TILT 0x0B
+#define MMA9551_APPID_SLEEP_WAKE 0x12
+#define MMA9551_APPID_RESET 0x17
+#define MMA9551_APPID_NONE 0xff
+
+/* Command masks for mailbox write command */
+#define MMA9551_CMD_READ_VERSION_INFO 0x00
+#define MMA9551_CMD_READ_CONFIG 0x10
+#define MMA9551_CMD_WRITE_CONFIG 0x20
+#define MMA9551_CMD_READ_STATUS 0x30
+
+enum mma9551_gpio_pin {
+ mma9551_gpio6 = 0,
+ mma9551_gpio7,
+ mma9551_gpio8,
+ mma9551_gpio9,
+ mma9551_gpio_max = mma9551_gpio9,
+};
+
+/* Mailbox read command */
+#define MMA9551_RESPONSE_COCO BIT(7)
+
+/* Error-Status codes returned in mailbox read command */
+#define MMA9551_MCI_ERROR_NONE 0x00
+#define MMA9551_MCI_ERROR_PARAM 0x04
+#define MMA9551_MCI_INVALID_COUNT 0x19
+#define MMA9551_MCI_ERROR_COMMAND 0x1C
+#define MMA9551_MCI_ERROR_INVALID_LENGTH 0x21
+#define MMA9551_MCI_ERROR_FIFO_BUSY 0x22
+#define MMA9551_MCI_ERROR_FIFO_ALLOCATED 0x23
+#define MMA9551_MCI_ERROR_FIFO_OVERSIZE 0x24
+
+/* GPIO Application */
+#define MMA9551_GPIO_POL_MSB 0x08
+#define MMA9551_GPIO_POL_LSB 0x09
+
+/* Sleep/Wake application */
+#define MMA9551_SLEEP_CFG 0x06
+#define MMA9551_SLEEP_CFG_SNCEN BIT(0)
+#define MMA9551_SLEEP_CFG_SCHEN BIT(2)
+
+/* AFE application */
+#define MMA9551_AFE_X_ACCEL_REG 0x00
+#define MMA9551_AFE_Y_ACCEL_REG 0x02
+#define MMA9551_AFE_Z_ACCEL_REG 0x04
+
+/* Tilt application (inclination in IIO terms). */
+#define MMA9551_TILT_XZ_ANG_REG 0x00
+#define MMA9551_TILT_YZ_ANG_REG 0x01
+#define MMA9551_TILT_XY_ANG_REG 0x02
+#define MMA9551_TILT_ANGFLG BIT(7)
+#define MMA9551_TILT_QUAD_REG 0x03
+#define MMA9551_TILT_XY_QUAD_SHIFT 0
+#define MMA9551_TILT_YZ_QUAD_SHIFT 2
+#define MMA9551_TILT_XZ_QUAD_SHIFT 4
+#define MMA9551_TILT_CFG_REG 0x01
+#define MMA9551_TILT_ANG_THRESH_MASK GENMASK(3, 0)
+
+/* Tilt events are mapped to the first three GPIO pins. */
+enum mma9551_tilt_axis {
+ mma9551_x = 0,
+ mma9551_y,
+ mma9551_z,
+};
+
+/*
+ * A response is composed of:
+ * - control registers: MB0-3
+ * - data registers: MB4-31
+ *
+ * A request is composed of:
+ * - mbox to write to (always 0)
+ * - control registers: MB1-4
+ * - data registers: MB5-31
+ */
+#define MMA9551_MAILBOX_CTRL_REGS 4
+#define MMA9551_MAX_MAILBOX_DATA_REGS 28
+#define MMA9551_MAILBOX_REGS 32
+
+#define MMA9551_I2C_READ_RETRIES 5
+#define MMA9551_I2C_READ_DELAY 50 /* us */
+
+struct mma9551_mbox_request {
+ u8 start_mbox; /* Always 0. */
+ u8 app_id;
+ /*
+ * See Section 5.3.1 of the MMA955xL Software Reference Manual.
+ *
+ * Bit 7: reserved, always 0
+ * Bits 6-4: command
+ * Bits 3-0: upper bits of register offset
+ */
+ u8 cmd_off;
+ u8 lower_off;
+ u8 nbytes;
+ u8 buf[MMA9551_MAX_MAILBOX_DATA_REGS - 1];
+} __packed;
+
+struct mma9551_mbox_response {
+ u8 app_id;
+ /*
+ * See Section 5.3.3 of the MMA955xL Software Reference Manual.
+ *
+ * Bit 7: COCO
+ * Bits 6-0: Error code.
+ */
+ u8 coco_err;
+ u8 nbytes;
+ u8 req_bytes;
+ u8 buf[MMA9551_MAX_MAILBOX_DATA_REGS];
+} __packed;
+
+struct mma9551_version_info {
+ __be32 device_id;
+ u8 rom_version[2];
+ u8 fw_version[2];
+ u8 hw_version[2];
+ u8 fw_build[2];
+};
+
+struct mma9551_data {
+ struct i2c_client *client;
+ struct mutex mutex;
+ int event_enabled[3];
+ int irqs[MMA9551_GPIO_COUNT];
+};
+
+static int mma9551_transfer(struct i2c_client *client,
+ u8 app_id, u8 command, u16 offset,
+ u8 *inbytes, int num_inbytes,
+ u8 *outbytes, int num_outbytes)
+{
+ struct mma9551_mbox_request req;
+ struct mma9551_mbox_response rsp;
+ struct i2c_msg in, out;
+ u8 req_len, err_code;
+ int ret, retries;
+
+ if (offset >= 1 << 12) {
+ dev_err(&client->dev, "register offset too large\n");
+ return -EINVAL;
+ }
+
+ req_len = 1 + MMA9551_MAILBOX_CTRL_REGS + num_inbytes;
+ req.start_mbox = 0;
+ req.app_id = app_id;
+ req.cmd_off = command | (offset >> 8);
+ req.lower_off = offset;
+
+ if (command == MMA9551_CMD_WRITE_CONFIG)
+ req.nbytes = num_inbytes;
+ else
+ req.nbytes = num_outbytes;
+ if (num_inbytes)
+ memcpy(req.buf, inbytes, num_inbytes);
+
+ out.addr = client->addr;
+ out.flags = 0;
+ out.len = req_len;
+ out.buf = (u8 *)&req;
+
+ ret = i2c_transfer(client->adapter, &out, 1);
+ if (ret < 0) {
+ dev_err(&client->dev, "i2c write failed\n");
+ return ret;
+ }
+
+ retries = MMA9551_I2C_READ_RETRIES;
+ do {
+ udelay(MMA9551_I2C_READ_DELAY);
+
+ in.addr = client->addr;
+ in.flags = I2C_M_RD;
+ in.len = sizeof(rsp);
+ in.buf = (u8 *)&rsp;
+
+ ret = i2c_transfer(client->adapter, &in, 1);
+ if (ret < 0) {
+ dev_err(&client->dev, "i2c read failed\n");
+ return ret;
+ }
+
+ if (rsp.coco_err & MMA9551_RESPONSE_COCO)
+ break;
+ } while (--retries > 0);
+
+ if (retries == 0) {
+ dev_err(&client->dev,
+ "timed out while waiting for command response\n");
+ return -ETIMEDOUT;
+ }
+
+ if (rsp.app_id != app_id) {
+ dev_err(&client->dev,
+ "app_id mismatch in response got %02x expected %02x\n",
+ rsp.app_id, app_id);
+ return -EINVAL;
+ }
+
+ err_code = rsp.coco_err & ~MMA9551_RESPONSE_COCO;
+ if (err_code != MMA9551_MCI_ERROR_NONE) {
+ dev_err(&client->dev, "read returned error %x\n", err_code);
+ return -EINVAL;
+ }
+
+ if (rsp.nbytes != rsp.req_bytes) {
+ dev_err(&client->dev,
+ "output length mismatch got %d expected %d\n",
+ rsp.nbytes, rsp.req_bytes);
+ return -EINVAL;
+ }
+
+ if (num_outbytes)
+ memcpy(outbytes, rsp.buf, num_outbytes);
+
+ return 0;
+}
+
+static int mma9551_read_config_byte(struct i2c_client *client, u8 app_id,
+ u16 reg, u8 *val)
+{
+ return mma9551_transfer(client, app_id, MMA9551_CMD_READ_CONFIG,
+ reg, NULL, 0, val, 1);
+}
+
+static int mma9551_write_config_byte(struct i2c_client *client, u8 app_id,
+ u16 reg, u8 val)
+{
+ return mma9551_transfer(client, app_id, MMA9551_CMD_WRITE_CONFIG, reg,
+ &val, 1, NULL, 0);
+}
+
+static int mma9551_read_status_byte(struct i2c_client *client, u8 app_id,
+ u16 reg, u8 *val)
+{
+ return mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS,
+ reg, NULL, 0, val, 1);
+}
+
+static int mma9551_read_status_word(struct i2c_client *client, u8 app_id,
+ u16 reg, u16 *val)
+{
+ int ret;
+ __be16 v;
+
+ ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS,
+ reg, NULL, 0, (u8 *)&v, 2);
+ *val = be16_to_cpu(v);
+
+ return ret;
+}
+
+static int mma9551_update_config_bits(struct i2c_client *client, u8 app_id,
+ u16 reg, u8 mask, u8 val)
+{
+ int ret;
+ u8 tmp, orig;
+
+ ret = mma9551_read_config_byte(client, app_id, reg, &orig);
+ if (ret < 0)
+ return ret;
+
+ tmp = orig & ~mask;
+ tmp |= val & mask;
+
+ if (tmp == orig)
+ return 0;
+
+ return mma9551_write_config_byte(client, app_id, reg, tmp);
+}
+
+/*
+ * The polarity parameter is described in section 6.2.2, page 66, of the
+ * Software Reference Manual. Basically, polarity=0 means the interrupt
+ * line has the same value as the selected bit, while polarity=1 means
+ * the line is inverted.
+ */
+static int mma9551_gpio_config(struct i2c_client *client,
+ enum mma9551_gpio_pin pin,
+ u8 app_id, u8 bitnum, int polarity)
+{
+ u8 reg, pol_mask, pol_val;
+ int ret;
+
+ if (pin > mma9551_gpio_max) {
+ dev_err(&client->dev, "bad GPIO pin\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Pin 6 is configured by regs 0x00 and 0x01, pin 7 by 0x02 and
+ * 0x03, and so on.
+ */
+ reg = pin * 2;
+
+ ret = mma9551_write_config_byte(client, MMA9551_APPID_GPIO,
+ reg, app_id);
+ if (ret < 0) {
+ dev_err(&client->dev, "error setting GPIO app_id\n");
+ return ret;
+ }
+
+ ret = mma9551_write_config_byte(client, MMA9551_APPID_GPIO,
+ reg + 1, bitnum);
+ if (ret < 0) {
+ dev_err(&client->dev, "error setting GPIO bit number\n");
+ return ret;
+ }
+
+ switch (pin) {
+ case mma9551_gpio6:
+ reg = MMA9551_GPIO_POL_LSB;
+ pol_mask = 1 << 6;
+ break;
+ case mma9551_gpio7:
+ reg = MMA9551_GPIO_POL_LSB;
+ pol_mask = 1 << 7;
+ break;
+ case mma9551_gpio8:
+ reg = MMA9551_GPIO_POL_MSB;
+ pol_mask = 1 << 0;
+ break;
+ case mma9551_gpio9:
+ reg = MMA9551_GPIO_POL_MSB;
+ pol_mask = 1 << 1;
+ break;
+ }
+ pol_val = polarity ? pol_mask : 0;
+
+ ret = mma9551_update_config_bits(client, MMA9551_APPID_GPIO, reg,
+ pol_mask, pol_val);
+ if (ret < 0)
+ dev_err(&client->dev, "error setting GPIO polarity\n");
+
+ return ret;
+}
+
+static int mma9551_read_version(struct i2c_client *client)
+{
+ struct mma9551_version_info info;
+ int ret;
+
+ ret = mma9551_transfer(client, MMA9551_APPID_VERSION, 0x00, 0x00,
+ NULL, 0, (u8 *)&info, sizeof(info));
+ if (ret < 0)
+ return ret;
+
+ dev_info(&client->dev, "Device ID 0x%x, firmware version %02x.%02x\n",
+ be32_to_cpu(info.device_id), info.fw_version[0],
+ info.fw_version[1]);
+
+ return 0;
+}
+
+/*
+ * Use 'false' as the second parameter to cause the device to enter
+ * sleep.
+ */
+static int mma9551_set_device_state(struct i2c_client *client,
+ bool enable)
+{
+ return mma9551_update_config_bits(client, MMA9551_APPID_SLEEP_WAKE,
+ MMA9551_SLEEP_CFG,
+ MMA9551_SLEEP_CFG_SNCEN,
+ enable ? 0 : MMA9551_SLEEP_CFG_SNCEN);
+}
+
+static int mma9551_read_incli_chan(struct i2c_client *client,
+ const struct iio_chan_spec *chan,
+ int *val)
+{
+ u8 quad_shift, angle, quadrant;
+ u16 reg_addr;
+ int ret;
+
+ switch (chan->channel2) {
+ case IIO_MOD_X:
+ reg_addr = MMA9551_TILT_YZ_ANG_REG;
+ quad_shift = MMA9551_TILT_YZ_QUAD_SHIFT;
+ break;
+ case IIO_MOD_Y:
+ reg_addr = MMA9551_TILT_XZ_ANG_REG;
+ quad_shift = MMA9551_TILT_XZ_QUAD_SHIFT;
+ break;
+ case IIO_MOD_Z:
+ reg_addr = MMA9551_TILT_XY_ANG_REG;
+ quad_shift = MMA9551_TILT_XY_QUAD_SHIFT;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
+ reg_addr, &angle);
+ if (ret < 0)
+ return ret;
+
+ ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
+ MMA9551_TILT_QUAD_REG, &quadrant);
+ if (ret < 0)
+ return ret;
+
+ angle &= ~MMA9551_TILT_ANGFLG;
+ quadrant = (quadrant >> quad_shift) & 0x03;
+
+ if (quadrant == 1 || quadrant == 3)
+ *val = 90 * (quadrant + 1) - angle;
+ else
+ *val = angle + 90 * quadrant;
+
+ return IIO_VAL_INT;
+}
+
+static int mma9551_read_accel_chan(struct i2c_client *client,
+ const struct iio_chan_spec *chan,
+ int *val, int *val2)
+{
+ u16 reg_addr;
+ s16 raw_accel;
+ int ret;
+
+ switch (chan->channel2) {
+ case IIO_MOD_X:
+ reg_addr = MMA9551_AFE_X_ACCEL_REG;
+ break;
+ case IIO_MOD_Y:
+ reg_addr = MMA9551_AFE_Y_ACCEL_REG;
+ break;
+ case IIO_MOD_Z:
+ reg_addr = MMA9551_AFE_Z_ACCEL_REG;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = mma9551_read_status_word(client, MMA9551_APPID_AFE,
+ reg_addr, &raw_accel);
+ if (ret < 0)
+ return ret;
+
+ *val = raw_accel;
+
+ return IIO_VAL_INT;
+}
+
+static int mma9551_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct mma9551_data *data = iio_priv(indio_dev);
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_PROCESSED:
+ switch (chan->type) {
+ case IIO_INCLI:
+ mutex_lock(&data->mutex);
+ ret = mma9551_read_incli_chan(data->client, chan, val);
+ mutex_unlock(&data->mutex);
+ return ret;
+ default:
+ return -EINVAL;
+ }
+ case IIO_CHAN_INFO_RAW:
+ switch (chan->type) {
+ case IIO_ACCEL:
+ mutex_lock(&data->mutex);
+ ret = mma9551_read_accel_chan(data->client,
+ chan, val, val2);
+ mutex_unlock(&data->mutex);
+ return ret;
+ default:
+ return -EINVAL;
+ }
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_ACCEL:
+ *val = 0;
+ *val2 = 2440;
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
+static int mma9551_read_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir)
+{
+ struct mma9551_data *data = iio_priv(indio_dev);
+
+ switch (chan->type) {
+ case IIO_INCLI:
+ /* IIO counts axes from 1, because IIO_NO_MOD is 0. */
+ return data->event_enabled[chan->channel2 - 1];
+ default:
+ return -EINVAL;
+ }
+}
+
+static int mma9551_config_incli_event(struct iio_dev *indio_dev,
+ enum iio_modifier axis,
+ int state)
+{
+ struct mma9551_data *data = iio_priv(indio_dev);
+ enum mma9551_tilt_axis mma_axis;
+ int ret;
+
+ /* IIO counts axes from 1, because IIO_NO_MOD is 0. */
+ mma_axis = axis - 1;
+
+ if (data->event_enabled[mma_axis] == state)
+ return 0;
+
+ if (state == 0) {
+ ret = mma9551_gpio_config(data->client, mma_axis,
+ MMA9551_APPID_NONE, 0, 0);
+ if (ret < 0)
+ return ret;
+ } else {
+ int bitnum;
+
+ /* Bit 7 of each angle register holds the angle flag. */
+ switch (axis) {
+ case IIO_MOD_X:
+ bitnum = 7 + 8 * MMA9551_TILT_YZ_ANG_REG;
+ break;
+ case IIO_MOD_Y:
+ bitnum = 7 + 8 * MMA9551_TILT_XZ_ANG_REG;
+ break;
+ case IIO_MOD_Z:
+ bitnum = 7 + 8 * MMA9551_TILT_XY_ANG_REG;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = mma9551_gpio_config(data->client, mma_axis,
+ MMA9551_APPID_TILT, bitnum, 0);
+ if (ret < 0)
+ return ret;
+ }
+
+ data->event_enabled[mma_axis] = state;
+
+ return ret;
+}
+
+static int mma9551_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)
+{
+ struct mma9551_data *data = iio_priv(indio_dev);
+ int ret;
+
+ switch (chan->type) {
+ case IIO_INCLI:
+ mutex_lock(&data->mutex);
+ ret = mma9551_config_incli_event(indio_dev,
+ chan->channel2, state);
+ mutex_unlock(&data->mutex);
+ return ret;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int mma9551_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)
+{
+ struct mma9551_data *data = iio_priv(indio_dev);
+ int ret;
+
+ switch (chan->type) {
+ case IIO_INCLI:
+ if (val2 != 0 || val < 1 || val > 10)
+ return -EINVAL;
+ mutex_lock(&data->mutex);
+ ret = mma9551_update_config_bits(data->client,
+ MMA9551_APPID_TILT,
+ MMA9551_TILT_CFG_REG,
+ MMA9551_TILT_ANG_THRESH_MASK,
+ val);
+ mutex_unlock(&data->mutex);
+ return ret;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int mma9551_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 mma9551_data *data = iio_priv(indio_dev);
+ int ret;
+ u8 tmp;
+
+ switch (chan->type) {
+ case IIO_INCLI:
+ mutex_lock(&data->mutex);
+ ret = mma9551_read_config_byte(data->client,
+ MMA9551_APPID_TILT,
+ MMA9551_TILT_CFG_REG, &tmp);
+ mutex_unlock(&data->mutex);
+ if (ret < 0)
+ return ret;
+ *val = tmp & MMA9551_TILT_ANG_THRESH_MASK;
+ *val2 = 0;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_event_spec mma9551_incli_event = {
+ .type = IIO_EV_TYPE_ROC,
+ .dir = IIO_EV_DIR_RISING,
+ .mask_separate = BIT(IIO_EV_INFO_ENABLE),
+ .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE),
+};
+
+#define MMA9551_ACCEL_CHANNEL(axis) { \
+ .type = IIO_ACCEL, \
+ .modified = 1, \
+ .channel2 = axis, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+}
+
+#define MMA9551_INCLI_CHANNEL(axis) { \
+ .type = IIO_INCLI, \
+ .modified = 1, \
+ .channel2 = axis, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
+ .event_spec = &mma9551_incli_event, \
+ .num_event_specs = 1, \
+}
+
+static const struct iio_chan_spec mma9551_channels[] = {
+ MMA9551_ACCEL_CHANNEL(IIO_MOD_X),
+ MMA9551_ACCEL_CHANNEL(IIO_MOD_Y),
+ MMA9551_ACCEL_CHANNEL(IIO_MOD_Z),
+
+ MMA9551_INCLI_CHANNEL(IIO_MOD_X),
+ MMA9551_INCLI_CHANNEL(IIO_MOD_Y),
+ MMA9551_INCLI_CHANNEL(IIO_MOD_Z),
+};
+
+static const struct iio_info mma9551_info = {
+ .driver_module = THIS_MODULE,
+ .read_raw = mma9551_read_raw,
+ .read_event_config = mma9551_read_event_config,
+ .write_event_config = mma9551_write_event_config,
+ .read_event_value = mma9551_read_event_value,
+ .write_event_value = mma9551_write_event_value,
+};
+
+static irqreturn_t mma9551_event_handler(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct mma9551_data *data = iio_priv(indio_dev);
+ int i, ret, mma_axis = -1;
+ u16 reg;
+ u8 val;
+
+ mutex_lock(&data->mutex);
+
+ for (i = 0; i < 3; i++)
+ if (irq == data->irqs[i]) {
+ mma_axis = i;
+ break;
+ }
+
+ if (mma_axis == -1) {
+ /* IRQ was triggered on 4th line, which we don't use. */
+ dev_warn(&data->client->dev,
+ "irq triggered on unused line %d\n", data->irqs[3]);
+ goto out;
+ }
+
+ switch (mma_axis) {
+ case mma9551_x:
+ reg = MMA9551_TILT_YZ_ANG_REG;
+ break;
+ case mma9551_y:
+ reg = MMA9551_TILT_XZ_ANG_REG;
+ break;
+ case mma9551_z:
+ reg = MMA9551_TILT_XY_ANG_REG;
+ break;
+ }
+
+ /*
+ * Read the angle even though we don't use it, otherwise we
+ * won't get any further interrupts.
+ */
+ ret = mma9551_read_status_byte(data->client, MMA9551_APPID_TILT,
+ reg, &val);
+ if (ret < 0) {
+ dev_err(&data->client->dev,
+ "error %d reading tilt register in IRQ\n", ret);
+ goto out;
+ }
+
+ iio_push_event(indio_dev,
+ IIO_MOD_EVENT_CODE(IIO_INCLI, 0, (mma_axis + 1),
+ IIO_EV_TYPE_ROC, IIO_EV_DIR_RISING),
+ iio_get_time_ns());
+
+out:
+ mutex_unlock(&data->mutex);
+
+ return IRQ_HANDLED;
+}
+
+static int mma9551_init(struct mma9551_data *data)
+{
+ int ret;
+
+ ret = mma9551_read_version(data->client);
+ if (ret)
+ return ret;
+
+ /* Power on chip and enable doze mode. */
+ return mma9551_update_config_bits(data->client,
+ MMA9551_APPID_SLEEP_WAKE,
+ MMA9551_SLEEP_CFG,
+ MMA9551_SLEEP_CFG_SCHEN | MMA9551_SLEEP_CFG_SNCEN,
+ MMA9551_SLEEP_CFG_SCHEN);
+}
+
+static int mma9551_gpio_probe(struct iio_dev *indio_dev)
+{
+ struct gpio_desc *gpio;
+ int i, ret;
+ struct mma9551_data *data = iio_priv(indio_dev);
+ struct device *dev = &data->client->dev;
+
+ for (i = 0; i < MMA9551_GPIO_COUNT; i++) {
+ gpio = devm_gpiod_get_index(dev, MMA9551_GPIO_NAME, i);
+ if (IS_ERR(gpio)) {
+ dev_err(dev, "acpi gpio get index failed\n");
+ return PTR_ERR(gpio);
+ }
+
+ ret = gpiod_direction_input(gpio);
+ if (ret)
+ return ret;
+
+ data->irqs[i] = gpiod_to_irq(gpio);
+ ret = devm_request_threaded_irq(dev, data->irqs[i],
+ NULL, mma9551_event_handler,
+ IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+ MMA9551_IRQ_NAME, indio_dev);
+ if (ret < 0) {
+ dev_err(dev, "request irq %d failed\n", data->irqs[i]);
+ return ret;
+ }
+
+ dev_dbg(dev, "gpio resource, no:%d irq:%d\n",
+ desc_to_gpio(gpio), data->irqs[i]);
+ }
+
+ return 0;
+}
+
+static const char *mma9551_match_acpi_device(struct device *dev)
+{
+ const struct acpi_device_id *id;
+
+ id = acpi_match_device(dev->driver->acpi_match_table, dev);
+ if (!id)
+ return NULL;
+
+ return dev_name(dev);
+}
+
+static int mma9551_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct mma9551_data *data;
+ struct iio_dev *indio_dev;
+ const char *name = NULL;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ data = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+ data->client = client;
+
+ if (id)
+ name = id->name;
+ else if (ACPI_HANDLE(&client->dev))
+ name = mma9551_match_acpi_device(&client->dev);
+
+ ret = mma9551_init(data);
+ if (ret < 0)
+ return ret;
+
+ mutex_init(&data->mutex);
+
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->channels = mma9551_channels;
+ indio_dev->num_channels = ARRAY_SIZE(mma9551_channels);
+ indio_dev->name = name;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->info = &mma9551_info;
+
+ ret = mma9551_gpio_probe(indio_dev);
+ if (ret < 0)
+ goto out_poweroff;
+
+ ret = iio_device_register(indio_dev);
+ if (ret < 0) {
+ dev_err(&client->dev, "unable to register iio device\n");
+ goto out_poweroff;
+ }
+
+ return 0;
+
+out_poweroff:
+ mma9551_set_device_state(client, false);
+
+ return ret;
+}
+
+static int mma9551_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct mma9551_data *data = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+ mutex_lock(&data->mutex);
+ mma9551_set_device_state(data->client, false);
+ mutex_unlock(&data->mutex);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int mma9551_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct mma9551_data *data = iio_priv(indio_dev);
+
+ mutex_lock(&data->mutex);
+ mma9551_set_device_state(data->client, false);
+ mutex_unlock(&data->mutex);
+
+ return 0;
+}
+
+static int mma9551_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct mma9551_data *data = iio_priv(indio_dev);
+
+ mutex_lock(&data->mutex);
+ mma9551_set_device_state(data->client, true);
+ mutex_unlock(&data->mutex);
+
+ return 0;
+}
+#else
+#define mma9551_suspend NULL
+#define mma9551_resume NULL
+#endif
+
+static const struct dev_pm_ops mma9551_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(mma9551_suspend, mma9551_resume)
+};
+
+static const struct acpi_device_id mma9551_acpi_match[] = {
+ {"MMA9551", 0},
+ {},
+};
+
+MODULE_DEVICE_TABLE(acpi, mma9551_acpi_match);
+
+static const struct i2c_device_id mma9551_id[] = {
+ {"mma9551", 0},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, mma9551_id);
+
+static struct i2c_driver mma9551_driver = {
+ .driver = {
+ .name = MMA9551_DRV_NAME,
+ .acpi_match_table = ACPI_PTR(mma9551_acpi_match),
+ .pm = &mma9551_pm_ops,
+ },
+ .probe = mma9551_probe,
+ .remove = mma9551_remove,
+ .id_table = mma9551_id,
+};
+
+module_i2c_driver(mma9551_driver);
+
+MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
+MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MMA9551L motion-sensing platform driver");
projects / platform / kernel / linux-rpi.git / commitdiff