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/*
* Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that 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/kernel.h>
#include <linux/errno.h>
#include <linux/idr.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/spmi.h>
#include <linux/pm_runtime.h>
#include <dt-bindings/spmi/spmi.h>
#define CREATE_TRACE_POINTS
#include <trace/events/spmi.h>
static bool is_registered;
static DEFINE_IDA(ctrl_ida);
static void spmi_dev_release(struct device *dev)
{
struct spmi_device *sdev = to_spmi_device(dev);
kfree(sdev);
}
static const struct device_type spmi_dev_type = {
.release = spmi_dev_release,
};
static void spmi_ctrl_release(struct device *dev)
{
struct spmi_controller *ctrl = to_spmi_controller(dev);
ida_simple_remove(&ctrl_ida, ctrl->nr);
kfree(ctrl);
}
static const struct device_type spmi_ctrl_type = {
.release = spmi_ctrl_release,
};
static int spmi_device_match(struct device *dev, struct device_driver *drv)
{
if (of_driver_match_device(dev, drv))
return 1;
if (drv->name)
return strncmp(dev_name(dev), drv->name,
SPMI_NAME_SIZE) == 0;
return 0;
}
/**
* spmi_device_add() - add a device previously constructed via spmi_device_alloc()
* @sdev: spmi_device to be added
*/
int spmi_device_add(struct spmi_device *sdev)
{
struct spmi_controller *ctrl = sdev->ctrl;
int err;
dev_set_name(&sdev->dev, "%d-%02x", ctrl->nr, sdev->usid);
err = device_add(&sdev->dev);
if (err < 0) {
dev_err(&sdev->dev, "Can't add %s, status %d\n",
dev_name(&sdev->dev), err);
goto err_device_add;
}
dev_dbg(&sdev->dev, "device %s registered\n", dev_name(&sdev->dev));
err_device_add:
return err;
}
EXPORT_SYMBOL_GPL(spmi_device_add);
/**
* spmi_device_remove(): remove an SPMI device
* @sdev: spmi_device to be removed
*/
void spmi_device_remove(struct spmi_device *sdev)
{
device_unregister(&sdev->dev);
}
EXPORT_SYMBOL_GPL(spmi_device_remove);
static inline int
spmi_cmd(struct spmi_controller *ctrl, u8 opcode, u8 sid)
{
int ret;
if (!ctrl || !ctrl->cmd || ctrl->dev.type != &spmi_ctrl_type)
return -EINVAL;
ret = ctrl->cmd(ctrl, opcode, sid);
trace_spmi_cmd(opcode, sid, ret);
return ret;
}
static inline int spmi_read_cmd(struct spmi_controller *ctrl, u8 opcode,
u8 sid, u16 addr, u8 *buf, size_t len)
{
int ret;
if (!ctrl || !ctrl->read_cmd || ctrl->dev.type != &spmi_ctrl_type)
return -EINVAL;
trace_spmi_read_begin(opcode, sid, addr);
ret = ctrl->read_cmd(ctrl, opcode, sid, addr, buf, len);
trace_spmi_read_end(opcode, sid, addr, ret, len, buf);
return ret;
}
static inline int spmi_write_cmd(struct spmi_controller *ctrl, u8 opcode,
u8 sid, u16 addr, const u8 *buf, size_t len)
{
int ret;
if (!ctrl || !ctrl->write_cmd || ctrl->dev.type != &spmi_ctrl_type)
return -EINVAL;
trace_spmi_write_begin(opcode, sid, addr, len, buf);
ret = ctrl->write_cmd(ctrl, opcode, sid, addr, buf, len);
trace_spmi_write_end(opcode, sid, addr, ret);
return ret;
}
/**
* spmi_register_read() - register read
* @sdev: SPMI device.
* @addr: slave register address (5-bit address).
* @buf: buffer to be populated with data from the Slave.
*
* Reads 1 byte of data from a Slave device register.
*/
int spmi_register_read(struct spmi_device *sdev, u8 addr, u8 *buf)
{
/* 5-bit register address */
if (addr > 0x1F)
return -EINVAL;
return spmi_read_cmd(sdev->ctrl, SPMI_CMD_READ, sdev->usid, addr,
buf, 1);
}
EXPORT_SYMBOL_GPL(spmi_register_read);
/**
* spmi_ext_register_read() - extended register read
* @sdev: SPMI device.
* @addr: slave register address (8-bit address).
* @buf: buffer to be populated with data from the Slave.
* @len: the request number of bytes to read (up to 16 bytes).
*
* Reads up to 16 bytes of data from the extended register space on a
* Slave device.
*/
int spmi_ext_register_read(struct spmi_device *sdev, u8 addr, u8 *buf,
size_t len)
{
/* 8-bit register address, up to 16 bytes */
if (len == 0 || len > 16)
return -EINVAL;
return spmi_read_cmd(sdev->ctrl, SPMI_CMD_EXT_READ, sdev->usid, addr,
buf, len);
}
EXPORT_SYMBOL_GPL(spmi_ext_register_read);
/**
* spmi_ext_register_readl() - extended register read long
* @sdev: SPMI device.
* @addr: slave register address (16-bit address).
* @buf: buffer to be populated with data from the Slave.
* @len: the request number of bytes to read (up to 8 bytes).
*
* Reads up to 8 bytes of data from the extended register space on a
* Slave device using 16-bit address.
*/
int spmi_ext_register_readl(struct spmi_device *sdev, u16 addr, u8 *buf,
size_t len)
{
/* 16-bit register address, up to 8 bytes */
if (len == 0 || len > 8)
return -EINVAL;
return spmi_read_cmd(sdev->ctrl, SPMI_CMD_EXT_READL, sdev->usid, addr,
buf, len);
}
EXPORT_SYMBOL_GPL(spmi_ext_register_readl);
/**
* spmi_register_write() - register write
* @sdev: SPMI device
* @addr: slave register address (5-bit address).
* @data: buffer containing the data to be transferred to the Slave.
*
* Writes 1 byte of data to a Slave device register.
*/
int spmi_register_write(struct spmi_device *sdev, u8 addr, u8 data)
{
/* 5-bit register address */
if (addr > 0x1F)
return -EINVAL;
return spmi_write_cmd(sdev->ctrl, SPMI_CMD_WRITE, sdev->usid, addr,
&data, 1);
}
EXPORT_SYMBOL_GPL(spmi_register_write);
/**
* spmi_register_zero_write() - register zero write
* @sdev: SPMI device.
* @data: the data to be written to register 0 (7-bits).
*
* Writes data to register 0 of the Slave device.
*/
int spmi_register_zero_write(struct spmi_device *sdev, u8 data)
{
return spmi_write_cmd(sdev->ctrl, SPMI_CMD_ZERO_WRITE, sdev->usid, 0,
&data, 1);
}
EXPORT_SYMBOL_GPL(spmi_register_zero_write);
/**
* spmi_ext_register_write() - extended register write
* @sdev: SPMI device.
* @addr: slave register address (8-bit address).
* @buf: buffer containing the data to be transferred to the Slave.
* @len: the request number of bytes to read (up to 16 bytes).
*
* Writes up to 16 bytes of data to the extended register space of a
* Slave device.
*/
int spmi_ext_register_write(struct spmi_device *sdev, u8 addr, const u8 *buf,
size_t len)
{
/* 8-bit register address, up to 16 bytes */
|