[PATCH v2 09/10] iio: accel: mma9551: split driver to expose mma955x api
From: Irina Tirdea
Date: Sun Jan 11 2015 - 14:11:26 EST
Freescale has the MMA955xL family of devices that use the
same communication protocol (based on i2c messages):
http://www.freescale.com/files/sensors/doc/data_sheet/MMA955xL.pdf.
To support more devices from this family, we need to split the
mma9551 driver so we can export the common functions that will
be used by other mma955x drivers.
Signed-off-by: Irina Tirdea <irina.tirdea@xxxxxxxxx>
Reviewed-by: Vlad Dogaru <vlad.dogaru@xxxxxxxxx>
---
drivers/iio/accel/Kconfig | 5 +
drivers/iio/accel/Makefile | 4 +-
drivers/iio/accel/mma9551.c | 443 +---------------------------
drivers/iio/accel/mma9551_core.c | 615 +++++++++++++++++++++++++++++++++++++++
drivers/iio/accel/mma9551_core.h | 66 +++++
5 files changed, 693 insertions(+), 440 deletions(-)
create mode 100644 drivers/iio/accel/mma9551_core.c
create mode 100644 drivers/iio/accel/mma9551_core.h
diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
index 9f67c10..c53047d 100644
--- a/drivers/iio/accel/Kconfig
+++ b/drivers/iio/accel/Kconfig
@@ -111,9 +111,14 @@ config KXCJK1013
To compile this driver as a module, choose M here: the module will
be called kxcjk-1013.
+config MMA9551_CORE
+ tristate
+
config MMA9551
tristate "Freescale MMA9551L Intelligent Motion-Sensing Platform Driver"
depends on I2C
+ select MMA9551_CORE
+
help
Say yes here to build support for the Freescale MMA9551L
Intelligent Motion-Sensing Platform Driver.
diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
index de5b9cb..8105316 100644
--- a/drivers/iio/accel/Makefile
+++ b/drivers/iio/accel/Makefile
@@ -9,7 +9,9 @@ obj-$(CONFIG_HID_SENSOR_ACCEL_3D) += hid-sensor-accel-3d.o
obj-$(CONFIG_KXCJK1013) += kxcjk-1013.o
obj-$(CONFIG_KXSD9) += kxsd9.o
obj-$(CONFIG_MMA8452) += mma8452.o
-obj-$(CONFIG_MMA9551) += mma9551.o
+
+obj-$(CONFIG_MMA9551_CORE) += mma9551_core.o
+obj-$(CONFIG_MMA9551) += mma9551.o
obj-$(CONFIG_IIO_ST_ACCEL_3AXIS) += st_accel.o
st_accel-y := st_accel_core.o
diff --git a/drivers/iio/accel/mma9551.c b/drivers/iio/accel/mma9551.c
index f1a5a06..46c3835 100644
--- a/drivers/iio/accel/mma9551.c
+++ b/drivers/iio/accel/mma9551.c
@@ -23,63 +23,13 @@
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#include <linux/pm_runtime.h>
+#include "mma9551_core.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_FLEEN BIT(1)
-#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
@@ -92,6 +42,8 @@ enum mma9551_gpio_pin {
#define MMA9551_TILT_CFG_REG 0x01
#define MMA9551_TILT_ANG_THRESH_MASK GENMASK(3, 0)
+#define MMA9551_DEFAULT_SAMPLE_RATE 122 /* Hz */
+
/* Tilt events are mapped to the first three GPIO pins. */
enum mma9551_tilt_axis {
mma9551_x = 0,
@@ -99,64 +51,6 @@ enum mma9551_tilt_axis {
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 */
-
-#define MMA9551_DEFAULT_SAMPLE_RATE 122 /* Hz */
-#define MMA9551_AUTO_SUSPEND_DELAY_MS 2000
-
-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;
@@ -164,285 +58,6 @@ struct mma9551_data {
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;
-}
-
-/*
- * Power on chip and enable doze mode.
- * 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 |
- MMA9551_SLEEP_CFG_FLEEN |
- MMA9551_SLEEP_CFG_SCHEN,
- enable ? MMA9551_SLEEP_CFG_SCHEN |
- MMA9551_SLEEP_CFG_FLEEN :
- MMA9551_SLEEP_CFG_SNCEN);
-}
-
-static int mma9551_set_power_state(struct i2c_client *client, bool on)
-{
-#ifdef CONFIG_PM
- int ret;
-
- if (on)
- ret = pm_runtime_get_sync(&client->dev);
- else {
- pm_runtime_mark_last_busy(&client->dev);
- ret = pm_runtime_put_autosuspend(&client->dev);
- }
-
- if (ret < 0) {
- dev_err(&client->dev,
- "failed to change power state to %d\n", on);
- if (on)
- pm_runtime_put_noidle(&client->dev);
-
- return ret;
- }
-#endif
-
- return 0;
-}
-
-static void mma9551_sleep(int freq)
-{
- int sleep_val = 1000 / freq;
-
- if (sleep_val < 20)
- usleep_range(sleep_val * 1000, 20000);
- else
- msleep_interruptible(sleep_val);
-}
-
static int mma9551_read_incli_chan(struct i2c_client *client,
const struct iio_chan_spec *chan,
int *val)
@@ -497,46 +112,6 @@ out_poweroff:
return ret;
}
-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_set_power_state(client, true);
- if (ret < 0)
- return ret;
-
- ret = mma9551_read_status_word(client, MMA9551_APPID_AFE,
- reg_addr, &raw_accel);
- if (ret < 0)
- goto out_poweroff;
-
- *val = raw_accel;
-
- ret = IIO_VAL_INT;
-
-out_poweroff:
- mma9551_set_power_state(client, false);
- return ret;
-}
-
static int mma9551_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
@@ -569,9 +144,7 @@ static int mma9551_read_raw(struct iio_dev *indio_dev,
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_ACCEL:
- *val = 0;
- *val2 = 2440;
- return IIO_VAL_INT_PLUS_MICRO;
+ return mma9551_read_accel_scale(val, val2);
default:
return -EINVAL;
}
@@ -740,14 +313,6 @@ static const struct iio_event_spec mma9551_incli_event = {
.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, \
diff --git a/drivers/iio/accel/mma9551_core.c b/drivers/iio/accel/mma9551_core.c
new file mode 100644
index 0000000..7f1a73e
--- /dev/null
+++ b/drivers/iio/accel/mma9551_core.c
@@ -0,0 +1,615 @@
+/*
+ * Common code for Freescale MMA955x Intelligent Sensor Platform drivers
+ * 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/delay.h>
+#include <linux/iio/iio.h>
+#include <linux/pm_runtime.h>
+#include "mma9551_core.h"
+
+/* 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
+
+/* 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_FLEEN BIT(1)
+#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
+
+/*
+ * 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];
+};
+
+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;
+}
+
+/**
+ * mma9551_read_config_byte() - read 1 configuration byte
+ * @client: I2C client
+ * @app_id: Application ID
+ * @reg: Application register
+ * @val: Pointer to store value read
+ *
+ * Read one configuration byte from the device using MMA955xL command format.
+ * Commands to the MMA955xL platform consist of a write followed
+ * by one or more reads.
+ *
+ * Locking note: This function must be called with the device lock held.
+ * Locking is not handled inside the function. Callers should ensure they
+ * serialize access to the HW.
+ *
+ * Returns: 0 on success, negative value on failure.
+ */
+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);
+}
+EXPORT_SYMBOL(mma9551_read_config_byte);
+
+/**
+ * mma9551_write_config_byte() - write 1 configuration byte
+ * @client: I2C client
+ * @app_id: Application ID
+ * @reg: Application register
+ * @val: Value to write
+ *
+ * Write one configuration byte from the device using MMA955xL command format.
+ * Commands to the MMA955xL platform consist of a write followed by one or
+ * more reads.
+ *
+ * Locking note: This function must be called with the device lock held.
+ * Locking is not handled inside the function. Callers should ensure they
+ * serialize access to the HW.
+ *
+ * Returns: 0 on success, negative value on failure.
+ */
+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);
+}
+EXPORT_SYMBOL(mma9551_write_config_byte);
+
+/**
+ * mma9551_read_status_byte() - read 1 status byte
+ * @client: I2C client
+ * @app_id: Application ID
+ * @reg: Application register
+ * @val: Pointer to store value read
+ *
+ * Read one status byte from the device using MMA955xL command format.
+ * Commands to the MMA955xL platform consist of a write followed by one or
+ * more reads.
+ *
+ * Locking note: This function must be called with the device lock held.
+ * Locking is not handled inside the function. Callers should ensure they
+ * serialize access to the HW.
+ *
+ * Returns: 0 on success, negative value on failure.
+ */
+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);
+}
+EXPORT_SYMBOL(mma9551_read_status_byte);
+
+/**
+ * mma9551_read_status_word() - read 1 status word
+ * @client: I2C client
+ * @app_id: Application ID
+ * @reg: Application register
+ * @val: Pointer to store value read
+ *
+ * Read one status word from the device using MMA955xL command format.
+ * Commands to the MMA955xL platform consist of a write followed by one or
+ * more reads.
+ *
+ * Locking note: This function must be called with the device lock held.
+ * Locking is not handled inside the function. Callers should ensure they
+ * serialize access to the HW.
+ *
+ * Returns: 0 on success, negative value on failure.
+ */
+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;
+}
+EXPORT_SYMBOL(mma9551_read_status_word);
+
+/**
+ * mma9551_update_config_bits() - update bits in register
+ * @client: I2C client
+ * @app_id: Application ID
+ * @reg: Application register
+ * @mask: Mask for the bits to update
+ * @val: Value of the bits to update
+ *
+ * Update bits in the given register using a bit mask.
+ *
+ * Locking note: This function must be called with the device lock held.
+ * Locking is not handled inside the function. Callers should ensure they
+ * serialize access to the HW.
+ *
+ * Returns: 0 on success, negative value on failure.
+ */
+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);
+}
+EXPORT_SYMBOL(mma9551_update_config_bits);
+
+/**
+ * mma9551_gpio_config() - configure gpio
+ * @client: I2C client
+ * @pin: GPIO pin to configure
+ * @app_id: Application ID
+ * @bitnum: Bit number of status register being assigned to the GPIO pin.
+ * @polarity: 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.
+ *
+ * Assign a bit from an applicationâs status register to a specific GPIO pin.
+ *
+ * Locking note: This function must be called with the device lock held.
+ * Locking is not handled inside the function. Callers should ensure they
+ * serialize access to the HW.
+ *
+ * Returns: 0 on success, negative value on failure.
+ */
+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;
+}
+EXPORT_SYMBOL(mma9551_gpio_config);
+
+/**
+ * mma9551_read_version() - read device version information
+ * @client: I2C client
+ *
+ * Read version information and print device id and firmware version.
+ *
+ * Locking note: This function must be called with the device lock held.
+ * Locking is not handled inside the function. Callers should ensure they
+ * serialize access to the HW.
+ *
+ * Returns: 0 on success, negative value on failure.
+ */
+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;
+}
+EXPORT_SYMBOL(mma9551_read_version);
+
+/**
+ * mma9551_set_device_state() - sets HW power mode
+ * @client: I2C client
+ * @enable: Use true to power on device, false to cause the device
+ * to enter sleep.
+ *
+ * Set power on/off for device using the Sleep/Wake Application.
+ * When enable is true, power on chip and enable doze mode.
+ * When enable is false, enter sleep mode (device remains in the
+ * lowest-power mode).
+ *
+ * Locking note: This function must be called with the device lock held.
+ * Locking is not handled inside the function. Callers should ensure they
+ * serialize access to the HW.
+ *
+ * Returns: 0 on success, negative value on failure.
+ */
+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 |
+ MMA9551_SLEEP_CFG_FLEEN |
+ MMA9551_SLEEP_CFG_SCHEN,
+ enable ? MMA9551_SLEEP_CFG_SCHEN |
+ MMA9551_SLEEP_CFG_FLEEN :
+ MMA9551_SLEEP_CFG_SNCEN);
+}
+EXPORT_SYMBOL(mma9551_set_device_state);
+
+/**
+ * mma9551_set_power_state() - sets runtime PM state
+ * @client: I2C client
+ * @on: Use true to power on device, false to power off
+ *
+ * Resume or suspend the device using Runtime PM.
+ * The device will suspend after the autosuspend delay.
+ *
+ * Returns: 0 on success, negative value on failure.
+ */
+int mma9551_set_power_state(struct i2c_client *client, bool on)
+{
+#ifdef CONFIG_PM
+ int ret;
+
+ if (on)
+ ret = pm_runtime_get_sync(&client->dev);
+ else {
+ pm_runtime_mark_last_busy(&client->dev);
+ ret = pm_runtime_put_autosuspend(&client->dev);
+ }
+
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "failed to change power state to %d\n", on);
+ if (on)
+ pm_runtime_put_noidle(&client->dev);
+
+ return ret;
+ }
+#endif
+
+ return 0;
+}
+EXPORT_SYMBOL(mma9551_set_power_state);
+
+/**
+ * mma9551_sleep() - sleep
+ * @freq: Application frequency
+ *
+ * Firmware applications run at a certain frequency on the
+ * device. Sleep for one application cycle to make sure the
+ * application had time to run once and initialize set values.
+ */
+void mma9551_sleep(int freq)
+{
+ int sleep_val = 1000 / freq;
+
+ if (sleep_val < 20)
+ usleep_range(sleep_val * 1000, 20000);
+ else
+ msleep_interruptible(sleep_val);
+}
+EXPORT_SYMBOL(mma9551_sleep);
+
+/**
+ * mma9551_read_accel_chan() - read accelerometer channel
+ * @client: I2C client
+ * @chan: IIO channel
+ * @val: Pointer to the accelerometer value read
+ * @val2: Unused
+ *
+ * Read accelerometer value for the specified channel.
+ *
+ * Locking note: This function must be called with the device lock held.
+ * Locking is not handled inside the function. Callers should ensure they
+ * serialize access to the HW.
+ *
+ * Returns: IIO_VAL_INT on success, negative value on failure.
+ */
+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_set_power_state(client, true);
+ if (ret < 0)
+ return ret;
+
+ ret = mma9551_read_status_word(client, MMA9551_APPID_AFE,
+ reg_addr, &raw_accel);
+ if (ret < 0)
+ goto out_poweroff;
+
+ *val = raw_accel;
+
+ ret = IIO_VAL_INT;
+
+out_poweroff:
+ mma9551_set_power_state(client, false);
+ return ret;
+}
+EXPORT_SYMBOL(mma9551_read_accel_chan);
+
+/**
+ * mma9551_read_accel_scale() - read accelerometer scale
+ * @val: Pointer to the accelerometer scale (int value)
+ * @val2: Pointer to the accelerometer scale (micro value)
+ *
+ * Read accelerometer scale.
+ *
+ * Returns: IIO_VAL_INT_PLUS_MICRO.
+ */
+int mma9551_read_accel_scale(int *val, int *val2)
+{
+ *val = 0;
+ *val2 = 2440;
+
+ return IIO_VAL_INT_PLUS_MICRO;
+}
+EXPORT_SYMBOL(mma9551_read_accel_scale);
+
+MODULE_AUTHOR("Irina Tirdea <irina.tirdea@xxxxxxxxx>");
+MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@xxxxxxxxx>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MMA955xL sensors core");
diff --git a/drivers/iio/accel/mma9551_core.h b/drivers/iio/accel/mma9551_core.h
new file mode 100644
index 0000000..e6efd02
--- /dev/null
+++ b/drivers/iio/accel/mma9551_core.h
@@ -0,0 +1,66 @@
+/*
+ * Common code for Freescale MMA955x Intelligent Sensor Platform drivers
+ * 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.
+ */
+
+#ifndef _MMA9551_CORE_H_
+#define _MMA9551_CORE_H_
+
+/* 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
+
+#define MMA9551_AUTO_SUSPEND_DELAY_MS 2000
+
+enum mma9551_gpio_pin {
+ mma9551_gpio6 = 0,
+ mma9551_gpio7,
+ mma9551_gpio8,
+ mma9551_gpio9,
+ mma9551_gpio_max = mma9551_gpio9,
+};
+
+#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), \
+}
+
+int mma9551_read_config_byte(struct i2c_client *client, u8 app_id,
+ u16 reg, u8 *val);
+int mma9551_write_config_byte(struct i2c_client *client, u8 app_id,
+ u16 reg, u8 val);
+int mma9551_read_status_byte(struct i2c_client *client, u8 app_id,
+ u16 reg, u8 *val);
+int mma9551_read_status_word(struct i2c_client *client, u8 app_id,
+ u16 reg, u16 *val);
+int mma9551_update_config_bits(struct i2c_client *client, u8 app_id,
+ u16 reg, u8 mask, u8 val);
+int mma9551_gpio_config(struct i2c_client *client, enum mma9551_gpio_pin pin,
+ u8 app_id, u8 bitnum, int polarity);
+int mma9551_read_version(struct i2c_client *client);
+int mma9551_set_device_state(struct i2c_client *client, bool enable);
+int mma9551_set_power_state(struct i2c_client *client, bool on);
+void mma9551_sleep(int freq);
+int mma9551_read_accel_chan(struct i2c_client *client,
+ const struct iio_chan_spec *chan,
+ int *val, int *val2);
+int mma9551_read_accel_scale(int *val, int *val2);
+
+#endif /* _MMA9551_CORE_H_ */
--
1.9.1
--
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