/* * 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 #include #include #include #include #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 /* Reset/Suspend/Clear application */ #define MMA9551_RSC_RESET 0x00 #define MMA9551_RSC_OFFSET(mask) (3 - (ffs(mask) - 1) / 8) #define MMA9551_RSC_VAL(mask) (mask >> (((ffs(mask) - 1) / 8) * 8)) /* * 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_config_word() - read 1 config word * @client: I2C client * @app_id: Application ID * @reg: Application register * @val: Pointer to store value read * * Read one configuration 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_config_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_CONFIG, reg, NULL, 0, (u8 *)&v, 2); *val = be16_to_cpu(v); return ret; } EXPORT_SYMBOL(mma9551_read_config_word); /** * mma9551_write_config_word() - write 1 config word * @client: I2C client * @app_id: Application ID * @reg: Application register * @val: Value to write * * Write one configuration 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_write_config_word(struct i2c_client *client, u8 app_id, u16 reg, u16 val) { __be16 v = cpu_to_be16(val); return mma9551_transfer(client, app_id, MMA9551_CMD_WRITE_CONFIG, reg, (u8 *)&v, 2, NULL, 0); } EXPORT_SYMBOL(mma9551_write_config_word); /** * 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_read_config_words() - read multiple config words * @client: I2C client * @app_id: Application ID * @reg: Application register * @len: Length of array to read (in words) * @buf: Array of words to read * * Read multiple configuration registers (word-sized registers). * * 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_words(struct i2c_client *client, u8 app_id, u16 reg, u8 len, u16 *buf) { int ret, i; __be16 be_buf[MMA9551_MAX_MAILBOX_DATA_REGS / 2]; if (len > ARRAY_SIZE(be_buf)) { dev_err(&client->dev, "Invalid buffer size %d\n", len); return -EINVAL; } ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_CONFIG, reg, NULL, 0, (u8 *)be_buf, len * sizeof(u16)); if (ret < 0) return ret; for (i = 0; i < len; i++) buf[i] = be16_to_cpu(be_buf[i]); return 0; } EXPORT_SYMBOL(mma9551_read_config_words); /** * mma9551_read_status_words() - read multiple status words * @client: I2C client * @app_id: Application ID * @reg: Application register * @len: Length of array to read (in words) * @buf: Array of words to read * * Read multiple status registers (word-sized registers). * * 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_words(struct i2c_client *client, u8 app_id, u16 reg, u8 len, u16 *buf) { int ret, i; __be16 be_buf[MMA9551_MAX_MAILBOX_DATA_REGS / 2]; if (len > ARRAY_SIZE(be_buf)) { dev_err(&client->dev, "Invalid buffer size %d\n", len); return -EINVAL; } ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS, reg, NULL, 0, (u8 *)be_buf, len * sizeof(u16)); if (ret < 0) return ret; for (i = 0; i < len; i++) buf[i] = be16_to_cpu(be_buf[i]); return 0; } EXPORT_SYMBOL(mma9551_read_status_words); /** * mma9551_write_config_words() - write multiple config words * @client: I2C client * @app_id: Application ID * @reg: Application register * @len: Length of array to write (in words) * @buf: Array of words to write * * Write multiple configuration registers (word-sized registers). * * 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_words(struct i2c_client *client, u8 app_id, u16 reg, u8 len, u16 *buf) { int i; __be16 be_buf[(MMA9551_MAX_MAILBOX_DATA_REGS - 1) / 2]; if (len > ARRAY_SIZE(be_buf)) { dev_err(&client->dev, "Invalid buffer size %d\n", len); return -EINVAL; } for (i = 0; i < len; i++) be_buf[i] = cpu_to_be16(buf[i]); return mma9551_transfer(client, app_id, MMA9551_CMD_WRITE_CONFIG, reg, (u8 *)be_buf, len * sizeof(u16), NULL, 0); } EXPORT_SYMBOL(mma9551_write_config_words); /** * 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); /** * mma9551_app_reset() - reset application * @client: I2C client * @app_mask: Application to reset * * Reset the given application (using the Reset/Suspend/Clear * Control Application) * * Returns: 0 on success, negative value on failure. */ int mma9551_app_reset(struct i2c_client *client, u32 app_mask) { return mma9551_write_config_byte(client, MMA9551_APPID_RSC, MMA9551_RSC_RESET + MMA9551_RSC_OFFSET(app_mask), MMA9551_RSC_VAL(app_mask)); } EXPORT_SYMBOL(mma9551_app_reset); MODULE_AUTHOR("Irina Tirdea "); MODULE_AUTHOR("Vlad Dogaru "); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("MMA955xL sensors core");