iio: accel: mma9551: split driver to expose mma955x api
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@intel.com> Reviewed-by: Vlad Dogaru <vlad.dogaru@intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Irina Tirdea
Jonathan Cameron
parent
6da93a6710
commit
d5b97f5c7d
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@ -111,9 +111,14 @@ config KXCJK1013
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To compile this driver as a module, choose M here: the module will
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be called kxcjk-1013.
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config MMA9551_CORE
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tristate
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config MMA9551
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tristate "Freescale MMA9551L Intelligent Motion-Sensing Platform Driver"
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depends on I2C
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select MMA9551_CORE
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help
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Say yes here to build support for the Freescale MMA9551L
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Intelligent Motion-Sensing Platform Driver.
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@ -9,7 +9,9 @@ obj-$(CONFIG_HID_SENSOR_ACCEL_3D) += hid-sensor-accel-3d.o
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obj-$(CONFIG_KXCJK1013) += kxcjk-1013.o
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obj-$(CONFIG_KXSD9) += kxsd9.o
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obj-$(CONFIG_MMA8452) += mma8452.o
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obj-$(CONFIG_MMA9551) += mma9551.o
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obj-$(CONFIG_MMA9551_CORE) += mma9551_core.o
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obj-$(CONFIG_MMA9551) += mma9551.o
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obj-$(CONFIG_IIO_ST_ACCEL_3AXIS) += st_accel.o
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st_accel-y := st_accel_core.o
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@ -23,63 +23,13 @@
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#include <linux/iio/sysfs.h>
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#include <linux/iio/events.h>
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#include <linux/pm_runtime.h>
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#include "mma9551_core.h"
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#define MMA9551_DRV_NAME "mma9551"
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#define MMA9551_IRQ_NAME "mma9551_event"
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#define MMA9551_GPIO_NAME "mma9551_int"
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#define MMA9551_GPIO_COUNT 4
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/* Applications IDs */
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#define MMA9551_APPID_VERSION 0x00
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#define MMA9551_APPID_GPIO 0x03
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#define MMA9551_APPID_AFE 0x06
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#define MMA9551_APPID_TILT 0x0B
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#define MMA9551_APPID_SLEEP_WAKE 0x12
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#define MMA9551_APPID_RESET 0x17
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#define MMA9551_APPID_NONE 0xff
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/* Command masks for mailbox write command */
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#define MMA9551_CMD_READ_VERSION_INFO 0x00
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#define MMA9551_CMD_READ_CONFIG 0x10
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#define MMA9551_CMD_WRITE_CONFIG 0x20
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#define MMA9551_CMD_READ_STATUS 0x30
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enum mma9551_gpio_pin {
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mma9551_gpio6 = 0,
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mma9551_gpio7,
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mma9551_gpio8,
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mma9551_gpio9,
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mma9551_gpio_max = mma9551_gpio9,
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};
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/* Mailbox read command */
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#define MMA9551_RESPONSE_COCO BIT(7)
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/* Error-Status codes returned in mailbox read command */
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#define MMA9551_MCI_ERROR_NONE 0x00
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#define MMA9551_MCI_ERROR_PARAM 0x04
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#define MMA9551_MCI_INVALID_COUNT 0x19
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#define MMA9551_MCI_ERROR_COMMAND 0x1C
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#define MMA9551_MCI_ERROR_INVALID_LENGTH 0x21
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#define MMA9551_MCI_ERROR_FIFO_BUSY 0x22
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#define MMA9551_MCI_ERROR_FIFO_ALLOCATED 0x23
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#define MMA9551_MCI_ERROR_FIFO_OVERSIZE 0x24
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/* GPIO Application */
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#define MMA9551_GPIO_POL_MSB 0x08
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#define MMA9551_GPIO_POL_LSB 0x09
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/* Sleep/Wake application */
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#define MMA9551_SLEEP_CFG 0x06
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#define MMA9551_SLEEP_CFG_SNCEN BIT(0)
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#define MMA9551_SLEEP_CFG_FLEEN BIT(1)
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#define MMA9551_SLEEP_CFG_SCHEN BIT(2)
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/* AFE application */
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#define MMA9551_AFE_X_ACCEL_REG 0x00
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#define MMA9551_AFE_Y_ACCEL_REG 0x02
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#define MMA9551_AFE_Z_ACCEL_REG 0x04
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/* Tilt application (inclination in IIO terms). */
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#define MMA9551_TILT_XZ_ANG_REG 0x00
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#define MMA9551_TILT_YZ_ANG_REG 0x01
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@ -92,6 +42,8 @@ enum mma9551_gpio_pin {
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#define MMA9551_TILT_CFG_REG 0x01
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#define MMA9551_TILT_ANG_THRESH_MASK GENMASK(3, 0)
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#define MMA9551_DEFAULT_SAMPLE_RATE 122 /* Hz */
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/* Tilt events are mapped to the first three GPIO pins. */
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enum mma9551_tilt_axis {
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mma9551_x = 0,
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@ -99,64 +51,6 @@ enum mma9551_tilt_axis {
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mma9551_z,
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};
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/*
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* A response is composed of:
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* - control registers: MB0-3
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* - data registers: MB4-31
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*
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* A request is composed of:
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* - mbox to write to (always 0)
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* - control registers: MB1-4
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* - data registers: MB5-31
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*/
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#define MMA9551_MAILBOX_CTRL_REGS 4
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#define MMA9551_MAX_MAILBOX_DATA_REGS 28
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#define MMA9551_MAILBOX_REGS 32
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#define MMA9551_I2C_READ_RETRIES 5
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#define MMA9551_I2C_READ_DELAY 50 /* us */
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#define MMA9551_DEFAULT_SAMPLE_RATE 122 /* Hz */
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#define MMA9551_AUTO_SUSPEND_DELAY_MS 2000
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struct mma9551_mbox_request {
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u8 start_mbox; /* Always 0. */
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u8 app_id;
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/*
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* See Section 5.3.1 of the MMA955xL Software Reference Manual.
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*
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* Bit 7: reserved, always 0
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* Bits 6-4: command
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* Bits 3-0: upper bits of register offset
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*/
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u8 cmd_off;
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u8 lower_off;
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u8 nbytes;
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u8 buf[MMA9551_MAX_MAILBOX_DATA_REGS - 1];
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} __packed;
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struct mma9551_mbox_response {
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u8 app_id;
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/*
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* See Section 5.3.3 of the MMA955xL Software Reference Manual.
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*
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* Bit 7: COCO
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* Bits 6-0: Error code.
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*/
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u8 coco_err;
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u8 nbytes;
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u8 req_bytes;
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u8 buf[MMA9551_MAX_MAILBOX_DATA_REGS];
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} __packed;
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struct mma9551_version_info {
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__be32 device_id;
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u8 rom_version[2];
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u8 fw_version[2];
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u8 hw_version[2];
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u8 fw_build[2];
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};
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struct mma9551_data {
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struct i2c_client *client;
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struct mutex mutex;
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@ -164,285 +58,6 @@ struct mma9551_data {
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int irqs[MMA9551_GPIO_COUNT];
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};
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static int mma9551_transfer(struct i2c_client *client,
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u8 app_id, u8 command, u16 offset,
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u8 *inbytes, int num_inbytes,
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u8 *outbytes, int num_outbytes)
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{
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struct mma9551_mbox_request req;
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struct mma9551_mbox_response rsp;
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struct i2c_msg in, out;
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u8 req_len, err_code;
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int ret, retries;
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if (offset >= 1 << 12) {
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dev_err(&client->dev, "register offset too large\n");
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return -EINVAL;
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}
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req_len = 1 + MMA9551_MAILBOX_CTRL_REGS + num_inbytes;
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req.start_mbox = 0;
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req.app_id = app_id;
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req.cmd_off = command | (offset >> 8);
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req.lower_off = offset;
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if (command == MMA9551_CMD_WRITE_CONFIG)
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req.nbytes = num_inbytes;
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else
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req.nbytes = num_outbytes;
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if (num_inbytes)
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memcpy(req.buf, inbytes, num_inbytes);
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out.addr = client->addr;
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out.flags = 0;
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out.len = req_len;
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out.buf = (u8 *)&req;
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ret = i2c_transfer(client->adapter, &out, 1);
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if (ret < 0) {
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dev_err(&client->dev, "i2c write failed\n");
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return ret;
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}
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retries = MMA9551_I2C_READ_RETRIES;
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do {
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udelay(MMA9551_I2C_READ_DELAY);
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in.addr = client->addr;
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in.flags = I2C_M_RD;
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in.len = sizeof(rsp);
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in.buf = (u8 *)&rsp;
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ret = i2c_transfer(client->adapter, &in, 1);
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if (ret < 0) {
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dev_err(&client->dev, "i2c read failed\n");
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return ret;
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}
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if (rsp.coco_err & MMA9551_RESPONSE_COCO)
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break;
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} while (--retries > 0);
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if (retries == 0) {
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dev_err(&client->dev,
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"timed out while waiting for command response\n");
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return -ETIMEDOUT;
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}
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if (rsp.app_id != app_id) {
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dev_err(&client->dev,
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"app_id mismatch in response got %02x expected %02x\n",
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rsp.app_id, app_id);
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return -EINVAL;
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}
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err_code = rsp.coco_err & ~MMA9551_RESPONSE_COCO;
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if (err_code != MMA9551_MCI_ERROR_NONE) {
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dev_err(&client->dev, "read returned error %x\n", err_code);
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return -EINVAL;
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}
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if (rsp.nbytes != rsp.req_bytes) {
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dev_err(&client->dev,
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"output length mismatch got %d expected %d\n",
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rsp.nbytes, rsp.req_bytes);
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return -EINVAL;
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}
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if (num_outbytes)
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memcpy(outbytes, rsp.buf, num_outbytes);
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return 0;
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}
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static int mma9551_read_config_byte(struct i2c_client *client, u8 app_id,
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u16 reg, u8 *val)
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{
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return mma9551_transfer(client, app_id, MMA9551_CMD_READ_CONFIG,
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reg, NULL, 0, val, 1);
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}
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static int mma9551_write_config_byte(struct i2c_client *client, u8 app_id,
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u16 reg, u8 val)
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{
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return mma9551_transfer(client, app_id, MMA9551_CMD_WRITE_CONFIG, reg,
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&val, 1, NULL, 0);
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}
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static int mma9551_read_status_byte(struct i2c_client *client, u8 app_id,
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u16 reg, u8 *val)
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{
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return mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS,
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reg, NULL, 0, val, 1);
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}
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static int mma9551_read_status_word(struct i2c_client *client, u8 app_id,
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u16 reg, u16 *val)
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{
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int ret;
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__be16 v;
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ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS,
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reg, NULL, 0, (u8 *)&v, 2);
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*val = be16_to_cpu(v);
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return ret;
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}
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static int mma9551_update_config_bits(struct i2c_client *client, u8 app_id,
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u16 reg, u8 mask, u8 val)
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{
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int ret;
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u8 tmp, orig;
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ret = mma9551_read_config_byte(client, app_id, reg, &orig);
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if (ret < 0)
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return ret;
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tmp = orig & ~mask;
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tmp |= val & mask;
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if (tmp == orig)
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return 0;
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return mma9551_write_config_byte(client, app_id, reg, tmp);
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}
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/*
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* The polarity parameter is described in section 6.2.2, page 66, of the
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* Software Reference Manual. Basically, polarity=0 means the interrupt
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* line has the same value as the selected bit, while polarity=1 means
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* the line is inverted.
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*/
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static int mma9551_gpio_config(struct i2c_client *client,
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enum mma9551_gpio_pin pin,
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u8 app_id, u8 bitnum, int polarity)
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{
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u8 reg, pol_mask, pol_val;
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int ret;
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if (pin > mma9551_gpio_max) {
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dev_err(&client->dev, "bad GPIO pin\n");
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return -EINVAL;
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}
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/*
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* Pin 6 is configured by regs 0x00 and 0x01, pin 7 by 0x02 and
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* 0x03, and so on.
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*/
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reg = pin * 2;
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ret = mma9551_write_config_byte(client, MMA9551_APPID_GPIO,
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reg, app_id);
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if (ret < 0) {
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dev_err(&client->dev, "error setting GPIO app_id\n");
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return ret;
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}
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ret = mma9551_write_config_byte(client, MMA9551_APPID_GPIO,
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reg + 1, bitnum);
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if (ret < 0) {
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dev_err(&client->dev, "error setting GPIO bit number\n");
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return ret;
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}
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switch (pin) {
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case mma9551_gpio6:
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reg = MMA9551_GPIO_POL_LSB;
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pol_mask = 1 << 6;
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break;
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case mma9551_gpio7:
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reg = MMA9551_GPIO_POL_LSB;
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pol_mask = 1 << 7;
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break;
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case mma9551_gpio8:
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reg = MMA9551_GPIO_POL_MSB;
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pol_mask = 1 << 0;
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break;
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case mma9551_gpio9:
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reg = MMA9551_GPIO_POL_MSB;
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pol_mask = 1 << 1;
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break;
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}
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pol_val = polarity ? pol_mask : 0;
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ret = mma9551_update_config_bits(client, MMA9551_APPID_GPIO, reg,
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pol_mask, pol_val);
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if (ret < 0)
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dev_err(&client->dev, "error setting GPIO polarity\n");
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return ret;
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}
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static int mma9551_read_version(struct i2c_client *client)
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{
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struct mma9551_version_info info;
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int ret;
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ret = mma9551_transfer(client, MMA9551_APPID_VERSION, 0x00, 0x00,
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NULL, 0, (u8 *)&info, sizeof(info));
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if (ret < 0)
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return ret;
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dev_info(&client->dev, "Device ID 0x%x, firmware version %02x.%02x\n",
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be32_to_cpu(info.device_id), info.fw_version[0],
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info.fw_version[1]);
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return 0;
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}
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/*
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* Power on chip and enable doze mode.
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* Use 'false' as the second parameter to cause the device to enter
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* sleep.
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*/
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static int mma9551_set_device_state(struct i2c_client *client, bool enable)
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{
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return mma9551_update_config_bits(client, MMA9551_APPID_SLEEP_WAKE,
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MMA9551_SLEEP_CFG,
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MMA9551_SLEEP_CFG_SNCEN |
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MMA9551_SLEEP_CFG_FLEEN |
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MMA9551_SLEEP_CFG_SCHEN,
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enable ? MMA9551_SLEEP_CFG_SCHEN |
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MMA9551_SLEEP_CFG_FLEEN :
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MMA9551_SLEEP_CFG_SNCEN);
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}
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static int mma9551_set_power_state(struct i2c_client *client, bool on)
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{
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#ifdef CONFIG_PM
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int ret;
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if (on)
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ret = pm_runtime_get_sync(&client->dev);
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else {
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pm_runtime_mark_last_busy(&client->dev);
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ret = pm_runtime_put_autosuspend(&client->dev);
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}
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if (ret < 0) {
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dev_err(&client->dev,
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"failed to change power state to %d\n", on);
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if (on)
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pm_runtime_put_noidle(&client->dev);
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return ret;
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}
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#endif
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return 0;
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}
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static void mma9551_sleep(int freq)
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{
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int sleep_val = 1000 / freq;
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if (sleep_val < 20)
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usleep_range(sleep_val * 1000, 20000);
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else
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msleep_interruptible(sleep_val);
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}
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static int mma9551_read_incli_chan(struct i2c_client *client,
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const struct iio_chan_spec *chan,
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int *val)
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@ -497,46 +112,6 @@ out_poweroff:
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return ret;
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}
|
||||
|
||||
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, \
|
||||
|
|
|
|||
615
drivers/iio/accel/mma9551_core.c
Normal file
615
drivers/iio/accel/mma9551_core.c
Normal file
|
|
@ -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 application’s 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@intel.com>");
|
||||
MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_DESCRIPTION("MMA955xL sensors core");
|
||||
66
drivers/iio/accel/mma9551_core.h
Normal file
66
drivers/iio/accel/mma9551_core.h
Normal file
|
|
@ -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_ */
|
||||
Loading…
Reference in a new issue