574 lines
14 KiB
C
Executable File
574 lines
14 KiB
C
Executable File
/* 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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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/idr.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/spmi.h>
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#include <linux/pm_runtime.h>
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#include <dt-bindings/spmi/spmi.h>
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static DEFINE_IDA(ctrl_ida);
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static void spmi_dev_release(struct device *dev)
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{
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struct spmi_device *sdev = to_spmi_device(dev);
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kfree(sdev);
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}
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static const struct device_type spmi_dev_type = {
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.release = spmi_dev_release,
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};
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static void spmi_ctrl_release(struct device *dev)
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{
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struct spmi_controller *ctrl = to_spmi_controller(dev);
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ida_simple_remove(&ctrl_ida, ctrl->nr);
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kfree(ctrl);
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}
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static const struct device_type spmi_ctrl_type = {
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.release = spmi_ctrl_release,
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};
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static int spmi_device_match(struct device *dev, struct device_driver *drv)
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{
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if (of_driver_match_device(dev, drv))
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return 1;
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if (drv->name)
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return strncmp(dev_name(dev), drv->name,
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SPMI_NAME_SIZE) == 0;
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return 0;
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}
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/**
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* spmi_device_add() - add a device previously constructed via spmi_device_alloc()
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* @sdev: spmi_device to be added
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*/
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int spmi_device_add(struct spmi_device *sdev)
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{
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struct spmi_controller *ctrl = sdev->ctrl;
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int err;
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dev_set_name(&sdev->dev, "%d-%02x", ctrl->nr, sdev->usid);
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err = device_add(&sdev->dev);
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if (err < 0) {
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dev_err(&sdev->dev, "Can't add %s, status %d\n",
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dev_name(&sdev->dev), err);
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goto err_device_add;
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}
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dev_dbg(&sdev->dev, "device %s registered\n", dev_name(&sdev->dev));
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err_device_add:
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return err;
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}
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EXPORT_SYMBOL_GPL(spmi_device_add);
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/**
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* spmi_device_remove(): remove an SPMI device
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* @sdev: spmi_device to be removed
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*/
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void spmi_device_remove(struct spmi_device *sdev)
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{
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device_unregister(&sdev->dev);
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}
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EXPORT_SYMBOL_GPL(spmi_device_remove);
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static inline int
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spmi_cmd(struct spmi_controller *ctrl, u8 opcode, u8 sid)
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{
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if (!ctrl || !ctrl->cmd || ctrl->dev.type != &spmi_ctrl_type)
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return -EINVAL;
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return ctrl->cmd(ctrl, opcode, sid);
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}
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static inline int spmi_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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{
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if (!ctrl || !ctrl->read_cmd || ctrl->dev.type != &spmi_ctrl_type)
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return -EINVAL;
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return ctrl->read_cmd(ctrl, opcode, sid, addr, buf, len);
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}
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static inline int spmi_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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if (!ctrl || !ctrl->write_cmd || ctrl->dev.type != &spmi_ctrl_type)
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return -EINVAL;
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return ctrl->write_cmd(ctrl, opcode, sid, addr, buf, len);
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}
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/**
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* spmi_register_read() - register read
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* @sdev: SPMI device.
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* @addr: slave register address (5-bit address).
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* @buf: buffer to be populated with data from the Slave.
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*
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* Reads 1 byte of data from a Slave device register.
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*/
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int spmi_register_read(struct spmi_device *sdev, u8 addr, u8 *buf)
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{
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/* 5-bit register address */
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if (addr > 0x1F)
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return -EINVAL;
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return spmi_read_cmd(sdev->ctrl, SPMI_CMD_READ, sdev->usid, addr,
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buf, 1);
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}
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EXPORT_SYMBOL_GPL(spmi_register_read);
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/**
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* spmi_ext_register_read() - extended register read
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* @sdev: SPMI device.
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* @addr: slave register address (8-bit address).
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* @buf: buffer to be populated with data from the Slave.
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* @len: the request number of bytes to read (up to 16 bytes).
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*
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* Reads up to 16 bytes of data from the extended register space on a
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* Slave device.
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*/
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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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{
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/* 8-bit register address, up to 16 bytes */
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if (len == 0 || len > 16)
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return -EINVAL;
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return spmi_read_cmd(sdev->ctrl, SPMI_CMD_EXT_READ, sdev->usid, addr,
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buf, len);
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}
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EXPORT_SYMBOL_GPL(spmi_ext_register_read);
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/**
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* spmi_ext_register_readl() - extended register read long
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* @sdev: SPMI device.
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* @addr: slave register address (16-bit address).
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* @buf: buffer to be populated with data from the Slave.
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* @len: the request number of bytes to read (up to 8 bytes).
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*
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* Reads up to 8 bytes of data from the extended register space on a
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* Slave device using 16-bit address.
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*/
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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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{
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/* 16-bit register address, up to 8 bytes */
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if (len == 0 || len > 8)
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return -EINVAL;
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return spmi_read_cmd(sdev->ctrl, SPMI_CMD_EXT_READL, sdev->usid, addr,
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buf, len);
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}
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EXPORT_SYMBOL_GPL(spmi_ext_register_readl);
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/**
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* spmi_register_write() - register write
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* @sdev: SPMI device
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* @addr: slave register address (5-bit address).
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* @data: buffer containing the data to be transferred to the Slave.
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*
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* Writes 1 byte of data to a Slave device register.
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*/
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int spmi_register_write(struct spmi_device *sdev, u8 addr, u8 data)
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{
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/* 5-bit register address */
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if (addr > 0x1F)
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return -EINVAL;
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return spmi_write_cmd(sdev->ctrl, SPMI_CMD_WRITE, sdev->usid, addr,
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&data, 1);
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}
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EXPORT_SYMBOL_GPL(spmi_register_write);
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/**
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* spmi_register_zero_write() - register zero write
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* @sdev: SPMI device.
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* @data: the data to be written to register 0 (7-bits).
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*
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* Writes data to register 0 of the Slave device.
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*/
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int spmi_register_zero_write(struct spmi_device *sdev, u8 data)
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{
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return spmi_write_cmd(sdev->ctrl, SPMI_CMD_ZERO_WRITE, sdev->usid, 0,
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&data, 1);
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}
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EXPORT_SYMBOL_GPL(spmi_register_zero_write);
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/**
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* spmi_ext_register_write() - extended register write
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* @sdev: SPMI device.
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* @addr: slave register address (8-bit address).
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* @buf: buffer containing the data to be transferred to the Slave.
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* @len: the request number of bytes to read (up to 16 bytes).
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*
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* Writes up to 16 bytes of data to the extended register space of a
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* Slave device.
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*/
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int spmi_ext_register_write(struct spmi_device *sdev, u8 addr, const u8 *buf,
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size_t len)
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{
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/* 8-bit register address, up to 16 bytes */
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if (len == 0 || len > 16)
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return -EINVAL;
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return spmi_write_cmd(sdev->ctrl, SPMI_CMD_EXT_WRITE, sdev->usid, addr,
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buf, len);
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}
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EXPORT_SYMBOL_GPL(spmi_ext_register_write);
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/**
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* spmi_ext_register_writel() - extended register write long
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* @sdev: SPMI device.
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* @addr: slave register address (16-bit address).
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* @buf: buffer containing the data to be transferred to the Slave.
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* @len: the request number of bytes to read (up to 8 bytes).
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*
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* Writes up to 8 bytes of data to the extended register space of a
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* Slave device using 16-bit address.
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*/
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int spmi_ext_register_writel(struct spmi_device *sdev, u16 addr, const u8 *buf,
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size_t len)
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{
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/* 4-bit Slave Identifier, 16-bit register address, up to 8 bytes */
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if (len == 0 || len > 8)
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return -EINVAL;
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return spmi_write_cmd(sdev->ctrl, SPMI_CMD_EXT_WRITEL, sdev->usid,
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addr, buf, len);
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}
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EXPORT_SYMBOL_GPL(spmi_ext_register_writel);
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/**
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* spmi_command_reset() - sends RESET command to the specified slave
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* @sdev: SPMI device.
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*
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* The Reset command initializes the Slave and forces all registers to
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* their reset values. The Slave shall enter the STARTUP state after
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* receiving a Reset command.
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*/
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int spmi_command_reset(struct spmi_device *sdev)
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{
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return spmi_cmd(sdev->ctrl, SPMI_CMD_RESET, sdev->usid);
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}
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EXPORT_SYMBOL_GPL(spmi_command_reset);
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/**
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* spmi_command_sleep() - sends SLEEP command to the specified SPMI device
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* @sdev: SPMI device.
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*
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* The Sleep command causes the Slave to enter the user defined SLEEP state.
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*/
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int spmi_command_sleep(struct spmi_device *sdev)
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{
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return spmi_cmd(sdev->ctrl, SPMI_CMD_SLEEP, sdev->usid);
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}
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EXPORT_SYMBOL_GPL(spmi_command_sleep);
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/**
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* spmi_command_wakeup() - sends WAKEUP command to the specified SPMI device
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* @sdev: SPMI device.
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*
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* The Wakeup command causes the Slave to move from the SLEEP state to
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* the ACTIVE state.
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*/
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int spmi_command_wakeup(struct spmi_device *sdev)
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{
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return spmi_cmd(sdev->ctrl, SPMI_CMD_WAKEUP, sdev->usid);
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}
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EXPORT_SYMBOL_GPL(spmi_command_wakeup);
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/**
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* spmi_command_shutdown() - sends SHUTDOWN command to the specified SPMI device
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* @sdev: SPMI device.
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*
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* The Shutdown command causes the Slave to enter the SHUTDOWN state.
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*/
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int spmi_command_shutdown(struct spmi_device *sdev)
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{
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return spmi_cmd(sdev->ctrl, SPMI_CMD_SHUTDOWN, sdev->usid);
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}
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EXPORT_SYMBOL_GPL(spmi_command_shutdown);
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static int spmi_drv_probe(struct device *dev)
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{
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const struct spmi_driver *sdrv = to_spmi_driver(dev->driver);
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struct spmi_device *sdev = to_spmi_device(dev);
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int err;
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/* Ensure the slave is in ACTIVE state */
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err = spmi_command_wakeup(sdev);
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if (err)
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goto fail_wakeup;
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pm_runtime_get_noresume(dev);
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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err = sdrv->probe(sdev);
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if (err)
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goto fail_probe;
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return 0;
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fail_probe:
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pm_runtime_disable(dev);
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pm_runtime_set_suspended(dev);
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pm_runtime_put_noidle(dev);
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fail_wakeup:
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return err;
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}
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static int spmi_drv_remove(struct device *dev)
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{
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const struct spmi_driver *sdrv = to_spmi_driver(dev->driver);
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pm_runtime_get_sync(dev);
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sdrv->remove(to_spmi_device(dev));
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pm_runtime_put_noidle(dev);
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pm_runtime_disable(dev);
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pm_runtime_set_suspended(dev);
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pm_runtime_put_noidle(dev);
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return 0;
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}
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static struct bus_type spmi_bus_type = {
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.name = "spmi",
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.match = spmi_device_match,
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.probe = spmi_drv_probe,
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.remove = spmi_drv_remove,
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};
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/**
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* spmi_controller_alloc() - Allocate a new SPMI device
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* @ctrl: associated controller
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*
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* Caller is responsible for either calling spmi_device_add() to add the
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* newly allocated controller, or calling spmi_device_put() to discard it.
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*/
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struct spmi_device *spmi_device_alloc(struct spmi_controller *ctrl)
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{
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struct spmi_device *sdev;
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sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
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if (!sdev)
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return NULL;
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sdev->ctrl = ctrl;
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device_initialize(&sdev->dev);
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sdev->dev.parent = &ctrl->dev;
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sdev->dev.bus = &spmi_bus_type;
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sdev->dev.type = &spmi_dev_type;
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return sdev;
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}
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EXPORT_SYMBOL_GPL(spmi_device_alloc);
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/**
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* spmi_controller_alloc() - Allocate a new SPMI controller
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* @parent: parent device
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* @size: size of private data
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*
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* Caller is responsible for either calling spmi_controller_add() to add the
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* newly allocated controller, or calling spmi_controller_put() to discard it.
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* The allocated private data region may be accessed via
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* spmi_controller_get_drvdata()
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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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struct spmi_controller *ctrl;
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int id;
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if (WARN_ON(!parent))
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return NULL;
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ctrl = kzalloc(sizeof(*ctrl) + size, GFP_KERNEL);
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if (!ctrl)
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return NULL;
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device_initialize(&ctrl->dev);
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ctrl->dev.type = &spmi_ctrl_type;
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ctrl->dev.bus = &spmi_bus_type;
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ctrl->dev.parent = parent;
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ctrl->dev.of_node = parent->of_node;
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spmi_controller_set_drvdata(ctrl, &ctrl[1]);
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id = ida_simple_get(&ctrl_ida, 0, 0, GFP_KERNEL);
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if (id < 0) {
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dev_err(parent,
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"unable to allocate SPMI controller identifier.\n");
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spmi_controller_put(ctrl);
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return NULL;
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}
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ctrl->nr = id;
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dev_set_name(&ctrl->dev, "spmi-%d", id);
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dev_dbg(&ctrl->dev, "allocated controller 0x%p id %d\n", ctrl, id);
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return ctrl;
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}
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EXPORT_SYMBOL_GPL(spmi_controller_alloc);
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static void of_spmi_register_devices(struct spmi_controller *ctrl)
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{
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struct device_node *node;
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int err;
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if (!ctrl->dev.of_node)
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return;
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for_each_available_child_of_node(ctrl->dev.of_node, node) {
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struct spmi_device *sdev;
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u32 reg[2];
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dev_dbg(&ctrl->dev, "adding child %s\n", node->full_name);
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err = of_property_read_u32_array(node, "reg", reg, 2);
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if (err) {
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dev_err(&ctrl->dev,
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"node %s err (%d) does not have 'reg' property\n",
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node->full_name, err);
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continue;
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}
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if (reg[1] != SPMI_USID) {
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dev_err(&ctrl->dev,
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"node %s contains unsupported 'reg' entry\n",
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node->full_name);
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continue;
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}
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if (reg[0] >= SPMI_MAX_SLAVE_ID) {
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dev_err(&ctrl->dev,
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"invalid usid on node %s\n",
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node->full_name);
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continue;
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}
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dev_dbg(&ctrl->dev, "read usid %02x\n", reg[0]);
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sdev = spmi_device_alloc(ctrl);
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if (!sdev)
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continue;
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sdev->dev.of_node = node;
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sdev->usid = (u8) reg[0];
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err = spmi_device_add(sdev);
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if (err) {
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dev_err(&sdev->dev,
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"failure adding device. status %d\n", err);
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spmi_device_put(sdev);
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}
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}
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}
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/**
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* spmi_controller_add() - Add an SPMI controller
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* @ctrl: controller to be registered.
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*
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* Register a controller previously allocated via spmi_controller_alloc() with
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* the SPMI core.
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*/
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int spmi_controller_add(struct spmi_controller *ctrl)
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{
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int ret;
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/* Can't register until after driver model init */
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if (WARN_ON(!spmi_bus_type.p))
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return -EAGAIN;
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ret = device_add(&ctrl->dev);
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if (ret)
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return ret;
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if (IS_ENABLED(CONFIG_OF))
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of_spmi_register_devices(ctrl);
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dev_dbg(&ctrl->dev, "spmi-%d registered: dev:%p\n",
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ctrl->nr, &ctrl->dev);
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return 0;
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};
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EXPORT_SYMBOL_GPL(spmi_controller_add);
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/* Remove a device associated with a controller */
|
|
static int spmi_ctrl_remove_device(struct device *dev, void *data)
|
|
{
|
|
struct spmi_device *spmidev = to_spmi_device(dev);
|
|
if (dev->type == &spmi_dev_type)
|
|
spmi_device_remove(spmidev);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* spmi_controller_remove(): remove an SPMI controller
|
|
* @ctrl: controller to remove
|
|
*
|
|
* Remove a SPMI controller. Caller is responsible for calling
|
|
* spmi_controller_put() to discard the allocated controller.
|
|
*/
|
|
void spmi_controller_remove(struct spmi_controller *ctrl)
|
|
{
|
|
int dummy;
|
|
|
|
if (!ctrl)
|
|
return;
|
|
|
|
dummy = device_for_each_child(&ctrl->dev, NULL,
|
|
spmi_ctrl_remove_device);
|
|
device_del(&ctrl->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(spmi_controller_remove);
|
|
|
|
/**
|
|
* spmi_driver_register() - Register client driver with SPMI core
|
|
* @sdrv: client driver to be associated with client-device.
|
|
*
|
|
* This API will register the client driver with the SPMI framework.
|
|
* It is typically called from the driver's module-init function.
|
|
*/
|
|
int spmi_driver_register(struct spmi_driver *sdrv)
|
|
{
|
|
sdrv->driver.bus = &spmi_bus_type;
|
|
return driver_register(&sdrv->driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(spmi_driver_register);
|
|
|
|
static void __exit spmi_exit(void)
|
|
{
|
|
bus_unregister(&spmi_bus_type);
|
|
}
|
|
module_exit(spmi_exit);
|
|
|
|
static int __init spmi_init(void)
|
|
{
|
|
return bus_register(&spmi_bus_type);
|
|
}
|
|
postcore_initcall(spmi_init);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("SPMI module");
|
|
MODULE_ALIAS("platform:spmi");
|