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System Power Management Interface (SPMI) is a specification developed by the MIPI (Mobile Industry Process Interface) Alliance optimized for the real time control of Power Management ICs (PMIC). SPMI is a two-wire serial interface that supports up to 4 master devices and up to 16 logical slaves. The framework supports message APIs, multiple busses (1 controller per bus) and multiple clients/slave devices per controller. Signed-off-by: Kenneth Heitke <kheitke@codeaurora.org> Signed-off-by: Michael Bohan <mbohan@codeaurora.org> Signed-off-by: Josh Cartwright <joshc@codeaurora.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
192 lines
6.0 KiB
C
192 lines
6.0 KiB
C
/* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _LINUX_SPMI_H
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#define _LINUX_SPMI_H
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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/* Maximum slave identifier */
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#define SPMI_MAX_SLAVE_ID 16
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/* SPMI Commands */
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#define SPMI_CMD_EXT_WRITE 0x00
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#define SPMI_CMD_RESET 0x10
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#define SPMI_CMD_SLEEP 0x11
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#define SPMI_CMD_SHUTDOWN 0x12
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#define SPMI_CMD_WAKEUP 0x13
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#define SPMI_CMD_AUTHENTICATE 0x14
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#define SPMI_CMD_MSTR_READ 0x15
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#define SPMI_CMD_MSTR_WRITE 0x16
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#define SPMI_CMD_TRANSFER_BUS_OWNERSHIP 0x1A
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#define SPMI_CMD_DDB_MASTER_READ 0x1B
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#define SPMI_CMD_DDB_SLAVE_READ 0x1C
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#define SPMI_CMD_EXT_READ 0x20
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#define SPMI_CMD_EXT_WRITEL 0x30
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#define SPMI_CMD_EXT_READL 0x38
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#define SPMI_CMD_WRITE 0x40
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#define SPMI_CMD_READ 0x60
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#define SPMI_CMD_ZERO_WRITE 0x80
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/**
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* struct spmi_device - Basic representation of an SPMI device
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* @dev: Driver model representation of the device.
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* @ctrl: SPMI controller managing the bus hosting this device.
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* @usid: This devices' Unique Slave IDentifier.
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*/
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struct spmi_device {
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struct device dev;
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struct spmi_controller *ctrl;
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u8 usid;
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};
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static inline struct spmi_device *to_spmi_device(struct device *d)
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{
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return container_of(d, struct spmi_device, dev);
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}
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static inline void *spmi_device_get_drvdata(const struct spmi_device *sdev)
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{
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return dev_get_drvdata(&sdev->dev);
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}
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static inline void spmi_device_set_drvdata(struct spmi_device *sdev, void *data)
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{
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dev_set_drvdata(&sdev->dev, data);
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}
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struct spmi_device *spmi_device_alloc(struct spmi_controller *ctrl);
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static inline void spmi_device_put(struct spmi_device *sdev)
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{
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if (sdev)
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put_device(&sdev->dev);
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}
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int spmi_device_add(struct spmi_device *sdev);
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void spmi_device_remove(struct spmi_device *sdev);
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/**
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* struct spmi_controller - interface to the SPMI master controller
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* @dev: Driver model representation of the device.
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* @nr: board-specific number identifier for this controller/bus
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* @cmd: sends a non-data command sequence on the SPMI bus.
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* @read_cmd: sends a register read command sequence on the SPMI bus.
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* @write_cmd: sends a register write command sequence on the SPMI bus.
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*/
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struct spmi_controller {
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struct device dev;
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unsigned int nr;
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int (*cmd)(struct spmi_controller *ctrl, u8 opcode, u8 sid);
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int (*read_cmd)(struct spmi_controller *ctrl, u8 opcode,
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u8 sid, u16 addr, u8 *buf, size_t len);
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int (*write_cmd)(struct spmi_controller *ctrl, u8 opcode,
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u8 sid, u16 addr, const u8 *buf, size_t len);
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};
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static inline struct spmi_controller *to_spmi_controller(struct device *d)
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{
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return container_of(d, struct spmi_controller, dev);
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}
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static inline
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void *spmi_controller_get_drvdata(const struct spmi_controller *ctrl)
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{
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return dev_get_drvdata(&ctrl->dev);
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}
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static inline void spmi_controller_set_drvdata(struct spmi_controller *ctrl,
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void *data)
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{
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dev_set_drvdata(&ctrl->dev, data);
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}
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struct spmi_controller *spmi_controller_alloc(struct device *parent,
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size_t size);
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/**
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* spmi_controller_put() - decrement controller refcount
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* @ctrl SPMI controller.
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*/
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static inline void spmi_controller_put(struct spmi_controller *ctrl)
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{
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if (ctrl)
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put_device(&ctrl->dev);
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}
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int spmi_controller_add(struct spmi_controller *ctrl);
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void spmi_controller_remove(struct spmi_controller *ctrl);
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/**
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* struct spmi_driver - SPMI slave device driver
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* @driver: SPMI device drivers should initialize name and owner field of
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* this structure.
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* @probe: binds this driver to a SPMI device.
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* @remove: unbinds this driver from the SPMI device.
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* @shutdown: standard shutdown callback used during powerdown/halt.
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* @suspend: standard suspend callback used during system suspend.
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* @resume: standard resume callback used during system resume.
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*
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* If PM runtime support is desired for a slave, a device driver can call
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* pm_runtime_put() from their probe() routine (and a balancing
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* pm_runtime_get() in remove()). PM runtime support for a slave is
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* implemented by issuing a SLEEP command to the slave on runtime_suspend(),
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* transitioning the slave into the SLEEP state. On runtime_resume(), a WAKEUP
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* command is sent to the slave to bring it back to ACTIVE.
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*/
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struct spmi_driver {
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struct device_driver driver;
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int (*probe)(struct spmi_device *sdev);
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void (*remove)(struct spmi_device *sdev);
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};
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static inline struct spmi_driver *to_spmi_driver(struct device_driver *d)
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{
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return container_of(d, struct spmi_driver, driver);
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}
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int spmi_driver_register(struct spmi_driver *sdrv);
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/**
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* spmi_driver_unregister() - unregister an SPMI client driver
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* @sdrv: the driver to unregister
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*/
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static inline void spmi_driver_unregister(struct spmi_driver *sdrv)
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{
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if (sdrv)
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driver_unregister(&sdrv->driver);
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}
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#define module_spmi_driver(__spmi_driver) \
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module_driver(__spmi_driver, spmi_driver_register, \
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spmi_driver_unregister)
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int spmi_register_read(struct spmi_device *sdev, u8 addr, u8 *buf);
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int spmi_ext_register_read(struct spmi_device *sdev, u8 addr, u8 *buf,
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size_t len);
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int spmi_ext_register_readl(struct spmi_device *sdev, u16 addr, u8 *buf,
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size_t len);
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int spmi_register_write(struct spmi_device *sdev, u8 addr, u8 data);
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int spmi_register_zero_write(struct spmi_device *sdev, u8 data);
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int spmi_ext_register_write(struct spmi_device *sdev, u8 addr,
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const u8 *buf, size_t len);
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int spmi_ext_register_writel(struct spmi_device *sdev, u16 addr,
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const u8 *buf, size_t len);
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int spmi_command_reset(struct spmi_device *sdev);
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int spmi_command_sleep(struct spmi_device *sdev);
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int spmi_command_wakeup(struct spmi_device *sdev);
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int spmi_command_shutdown(struct spmi_device *sdev);
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#endif
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