/* SPDX-License-Identifier: GPL-2.0+ */ /* * Copyright (C) 2017-2020 Jacopo Mondi * Copyright (C) 2017-2020 Kieran Bingham * Copyright (C) 2017-2020 Laurent Pinchart * Copyright (C) 2017-2020 Niklas Söderlund * Copyright (C) 2016 Renesas Electronics Corporation * Copyright (C) 2015 Cogent Embedded, Inc. */ #include <linux/i2c.h> #define MAX9271_DEFAULT_ADDR 0x40 /* Register 0x02 */ #define MAX9271_SPREAD_SPECT_0 (0 << 5) #define MAX9271_SPREAD_SPECT_05 (1 << 5) #define MAX9271_SPREAD_SPECT_15 (2 << 5) #define MAX9271_SPREAD_SPECT_1 (5 << 5) #define MAX9271_SPREAD_SPECT_2 (3 << 5) #define MAX9271_SPREAD_SPECT_3 (6 << 5) #define MAX9271_SPREAD_SPECT_4 (7 << 5) #define MAX9271_R02_RES BIT(4) #define MAX9271_PCLK_AUTODETECT (3 << 2) #define MAX9271_SERIAL_AUTODETECT (0x03) /* Register 0x04 */ #define MAX9271_SEREN BIT(7) #define MAX9271_CLINKEN BIT(6) #define MAX9271_PRBSEN BIT(5) #define MAX9271_SLEEP BIT(4) #define MAX9271_INTTYPE_I2C (0 << 2) #define MAX9271_INTTYPE_UART (1 << 2) #define MAX9271_INTTYPE_NONE (2 << 2) #define MAX9271_REVCCEN BIT(1) #define MAX9271_FWDCCEN BIT(0) /* Register 0x07 */ #define MAX9271_DBL BIT(7) #define MAX9271_DRS BIT(6) #define MAX9271_BWS BIT(5) #define MAX9271_ES BIT(4) #define MAX9271_HVEN BIT(2) #define MAX9271_EDC_1BIT_PARITY (0 << 0) #define MAX9271_EDC_6BIT_CRC (1 << 0) #define MAX9271_EDC_6BIT_HAMMING (2 << 0) /* Register 0x08 */ #define MAX9271_INVVS BIT(7) #define MAX9271_INVHS BIT(6) #define MAX9271_REV_LOGAIN BIT(3) #define MAX9271_REV_HIVTH BIT(0) /* Register 0x09 */ #define MAX9271_ID 0x09 /* Register 0x0d */ #define MAX9271_I2CLOCACK BIT(7) #define MAX9271_I2CSLVSH_1046NS_469NS (3 << 5) #define MAX9271_I2CSLVSH_938NS_352NS (2 << 5) #define MAX9271_I2CSLVSH_469NS_234NS (1 << 5) #define MAX9271_I2CSLVSH_352NS_117NS (0 << 5) #define MAX9271_I2CMSTBT_837KBPS (7 << 2) #define MAX9271_I2CMSTBT_533KBPS (6 << 2) #define MAX9271_I2CMSTBT_339KBPS (5 << 2) #define MAX9271_I2CMSTBT_173KBPS (4 << 2) #define MAX9271_I2CMSTBT_105KBPS (3 << 2) #define MAX9271_I2CMSTBT_84KBPS (2 << 2) #define MAX9271_I2CMSTBT_28KBPS (1 << 2) #define MAX9271_I2CMSTBT_8KBPS (0 << 2) #define MAX9271_I2CSLVTO_NONE (3 << 0) #define MAX9271_I2CSLVTO_1024US (2 << 0) #define MAX9271_I2CSLVTO_256US (1 << 0) #define MAX9271_I2CSLVTO_64US (0 << 0) /* Register 0x0f */ #define MAX9271_GPIO5OUT BIT(5) #define MAX9271_GPIO4OUT BIT(4) #define MAX9271_GPIO3OUT BIT(3) #define MAX9271_GPIO2OUT BIT(2) #define MAX9271_GPIO1OUT BIT(1) #define MAX9271_GPO BIT(0) /* Register 0x15 */ #define MAX9271_PCLKDET BIT(0) /** * struct max9271_device - max9271 device * @client: The i2c client for the max9271 instance */ struct max9271_device { struct i2c_client *client; }; /** * max9271_wake_up() - Wake up the serializer by issuing an i2c transaction * @dev: The max9271 device * * This function shall be called before any other interaction with the * serializer. */ void max9271_wake_up(struct max9271_device *dev); /** * max9271_set_serial_link() - Enable/disable serial link * @dev: The max9271 device * @enable: Serial link enable/disable flag * * Return 0 on success or a negative error code on failure */ int max9271_set_serial_link(struct max9271_device *dev, bool enable); /** * max9271_configure_i2c() - Configure I2C bus parameters * @dev: The max9271 device * @i2c_config: The I2C bus configuration bit mask * * Configure MAX9271 I2C interface. The bus configuration provided in the * @i2c_config parameter shall be assembled using bit values defined by the * MAX9271_I2C* macros. * * Return 0 on success or a negative error code on failure */ int max9271_configure_i2c(struct max9271_device *dev, u8 i2c_config); /** * max9271_set_high_threshold() - Enable or disable reverse channel high * threshold * @dev: The max9271 device * @enable: High threshold enable/disable flag * * Return 0 on success or a negative error code on failure */ int max9271_set_high_threshold(struct max9271_device *dev, bool enable); /** * max9271_configure_gmsl_link() - Configure the GMSL link * @dev: The max9271 device * * FIXME: the GMSL link configuration is currently hardcoded and performed * by programming registers 0x04, 0x07 and 0x02. * * Return 0 on success or a negative error code on failure */ int max9271_configure_gmsl_link(struct max9271_device *dev); /** * max9271_set_gpios() - Set gpio lines to physical high value * @dev: The max9271 device * @gpio_mask: The mask of gpio lines to set to high value * * The @gpio_mask parameter shall be assembled using the MAX9271_GP[IO|O]* * bit values. * * Return 0 on success or a negative error code on failure */ int max9271_set_gpios(struct max9271_device *dev, u8 gpio_mask); /** * max9271_clear_gpios() - Set gpio lines to physical low value * @dev: The max9271 device * @gpio_mask: The mask of gpio lines to set to low value * * The @gpio_mask parameter shall be assembled using the MAX9271_GP[IO|O]* * bit values. * * Return 0 on success or a negative error code on failure */ int max9271_clear_gpios(struct max9271_device *dev, u8 gpio_mask); /** * max9271_enable_gpios() - Enable gpio lines * @dev: The max9271 device * @gpio_mask: The mask of gpio lines to enable * * The @gpio_mask parameter shall be assembled using the MAX9271_GPIO* * bit values. GPO line is always enabled by default. * * Return 0 on success or a negative error code on failure */ int max9271_enable_gpios(struct max9271_device *dev, u8 gpio_mask); /** * max9271_disable_gpios() - Disable gpio lines * @dev: The max9271 device * @gpio_mask: The mask of gpio lines to disable * * The @gpio_mask parameter shall be assembled using the MAX9271_GPIO* * bit values. GPO line is always enabled by default and cannot be disabled. * * Return 0 on success or a negative error code on failure */ int max9271_disable_gpios(struct max9271_device *dev, u8 gpio_mask); /** * max9271_verify_id() - Read and verify MAX9271 id * @dev: The max9271 device * * Return 0 on success or a negative error code on failure */ int max9271_verify_id(struct max9271_device *dev); /** * max9271_set_address() - Program a new I2C address * @dev: The max9271 device * @addr: The new I2C address in 7-bit format * * This function only takes care of programming the new I2C address @addr to * in the MAX9271 chip registers, it is responsiblity of the caller to set * the i2c address client to the @addr value to be able to communicate with * the MAX9271 chip using the I2C framework APIs after this function returns. * * Return 0 on success or a negative error code on failure */ int max9271_set_address(struct max9271_device *dev, u8 addr); /** * max9271_set_deserializer_address() - Program the remote deserializer address * @dev: The max9271 device * @addr: The deserializer I2C address in 7-bit format * * Return 0 on success or a negative error code on failure */ int max9271_set_deserializer_address(struct max9271_device *dev, u8 addr); /** * max9271_set_translation() - Program I2C address translation * @dev: The max9271 device * @source: The I2C source address * @dest: The I2C destination address * * Program address translation from @source to @dest. This is required to * communicate with local devices that do not support address reprogramming. * * TODO: The device supports translation of two address, this function currently * supports a single one. * * Return 0 on success or a negative error code on failure */ int max9271_set_translation(struct max9271_device *dev, u8 source, u8 dest)