Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754643Ab3HVW6d (ORCPT ); Thu, 22 Aug 2013 18:58:33 -0400 Received: from smtp.codeaurora.org ([198.145.11.231]:56759 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754313Ab3HVW5F (ORCPT ); Thu, 22 Aug 2013 18:57:05 -0400 Message-Id: <46db5901fe4d04d09cee8fd81ea1c62068ee9503.1377202730.git.joshc@codeaurora.org> In-Reply-To: References: From: Josh Cartwright Date: Fri, 9 Aug 2013 13:37:09 -0700 To: Grant Likely , Rob Herring , Greg Kroah-Hartman Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, Sagar Dharia , Gilad Avidov , Michael Bohan Subject: [PATCH RFC v2 2/5] spmi: Linux driver framework for SPMI Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 44753 Lines: 1587 From: Kenneth Heitke 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 Signed-off-by: Michael Bohan Signed-off-by: Josh Cartwright --- drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/spmi/Kconfig | 9 + drivers/spmi/Makefile | 4 + drivers/spmi/spmi-dbgfs.c | 580 ++++++++++++++++++++++++++++++++++++++++ drivers/spmi/spmi-dbgfs.h | 25 ++ drivers/spmi/spmi.c | 491 ++++++++++++++++++++++++++++++++++ include/linux/mod_devicetable.h | 8 + include/linux/spmi.h | 355 ++++++++++++++++++++++++ 9 files changed, 1475 insertions(+) create mode 100644 drivers/spmi/Kconfig create mode 100644 drivers/spmi/Makefile create mode 100644 drivers/spmi/spmi-dbgfs.c create mode 100644 drivers/spmi/spmi-dbgfs.h create mode 100644 drivers/spmi/spmi.c create mode 100644 include/linux/spmi.h diff --git a/drivers/Kconfig b/drivers/Kconfig index aa43b91..2b35420 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -52,6 +52,8 @@ source "drivers/i2c/Kconfig" source "drivers/spi/Kconfig" +source "drivers/spmi/Kconfig" + source "drivers/hsi/Kconfig" source "drivers/pps/Kconfig" diff --git a/drivers/Makefile b/drivers/Makefile index ab93de8..5c250df 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -64,6 +64,7 @@ obj-$(CONFIG_ATA) += ata/ obj-$(CONFIG_TARGET_CORE) += target/ obj-$(CONFIG_MTD) += mtd/ obj-$(CONFIG_SPI) += spi/ +obj-$(CONFIG_SPMI) += spmi/ obj-y += hsi/ obj-y += net/ obj-$(CONFIG_ATM) += atm/ diff --git a/drivers/spmi/Kconfig b/drivers/spmi/Kconfig new file mode 100644 index 0000000..a03835f --- /dev/null +++ b/drivers/spmi/Kconfig @@ -0,0 +1,9 @@ +# +# SPMI driver configuration +# +menuconfig SPMI + bool "SPMI support" + help + SPMI (System Power Management Interface) is a two-wire + serial interface between baseband and application processors + and Power Management Integrated Circuits (PMIC). diff --git a/drivers/spmi/Makefile b/drivers/spmi/Makefile new file mode 100644 index 0000000..9d78ec9 --- /dev/null +++ b/drivers/spmi/Makefile @@ -0,0 +1,4 @@ +# +# Makefile for kernel SPMI framework. +# +obj-$(CONFIG_SPMI) += spmi.o spmi-dbgfs.o diff --git a/drivers/spmi/spmi-dbgfs.c b/drivers/spmi/spmi-dbgfs.c new file mode 100644 index 0000000..8b6f0e3 --- /dev/null +++ b/drivers/spmi/spmi-dbgfs.c @@ -0,0 +1,580 @@ +/* Copyright (c) 2012-2013, 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "spmi-dbgfs.h" + +#define ADDR_LEN 6 /* 5 byte address + 1 space character */ +#define CHARS_PER_ITEM 3 /* Format is 'XX ' */ +#define ITEMS_PER_LINE 16 /* 16 data items per line */ +#define MAX_LINE_LENGTH (ADDR_LEN + (ITEMS_PER_LINE * CHARS_PER_ITEM) + 1) + +#define MAX_REG_PER_TRANSACTION (8) + +static const mode_t DFS_MODE = S_IRUSR | S_IWUSR; + +/* Log buffer */ +struct spmi_log_buffer { + u32 rpos; /* Current 'read' position in buffer */ + u32 wpos; /* Current 'write' position in buffer */ + u32 len; /* Length of the buffer */ + char data[0]; /* Log buffer */ +}; + +/* SPMI transaction parameters */ +struct spmi_trans { + u32 cnt; /* Number of bytes to read */ + u32 addr; /* 20-bit address: SID + PID + Register offset */ + u32 offset; /* Offset of last read data */ + bool raw_data; /* Set to true for raw data dump */ + struct spmi_device *sdev; + struct spmi_log_buffer *log; /* log buffer */ +}; + +static char dbgfs_help[] = + "SPMI Debug-FS support\n" + "\n" + "Hierarchy schema:\n" + "/sys/kernel/debug/spmi\n" + " /help -- Static help text\n" + " /spmi-0 -- Directory for SPMI bus 0\n" + " /spmi-0/0-1 -- Directory for SPMI device '0-1'\n" + " /spmi-0/0-1/address -- Starting register for reads or writes\n" + " /spmi-0/0-1/count -- Number of registers to read (only used for reads)\n" + " /spmi-0/0-1/data -- Initiates the SPMI read (formatted output)\n" + " /spmi-0/0-1/data_raw -- Initiates the SPMI raw read or write\n" + " /spmi-n -- Directory for SPMI bus n\n" + "\n" + "To perform SPMI read or write transactions, you need to first write the\n" + "address of the slave device register to the 'address' file. For read\n" + "transactions, the number of bytes to be read needs to be written to the\n" + "'count' file.\n" + "\n" + "The 'address' file specifies the 20-bit address of a slave device register.\n" + "The upper 4 bits 'address[19..16]' specify the slave identifier (SID) for\n" + "the slave device. The lower 16 bits specify the slave register address.\n" + "\n" + "Reading from the 'data' file will initiate a SPMI read transaction starting\n" + "from slave register 'address' for 'count' number of bytes.\n" + "\n" + "Writing to the 'data' file will initiate a SPMI write transaction starting\n" + "from slave register 'address'. The number of registers written to will\n" + "match the number of bytes written to the 'data' file.\n" + "\n" + "Example: Read 4 bytes starting at register address 0x1234 for SID 2\n" + "\n" + "echo 0x21234 > address\n" + "echo 4 > count\n" + "cat data\n" + "\n" + "Example: Write 3 bytes starting at register address 0x1008 for SID 1\n" + "\n" + "echo 0x11008 > address\n" + "echo 0x01 0x02 0x03 > data\n" + "\n" + "Note that the count file is not used for writes. Since 3 bytes are\n" + "written to the 'data' file, then 3 bytes will be written across the\n" + "SPMI bus.\n\n"; + +static struct debugfs_blob_wrapper spmi_debug_help = { + .data = dbgfs_help, + .size = sizeof(dbgfs_help), +}; + +static struct dentry *spmi_debug_root; + +static int spmi_device_dfs_open(struct spmi_device *sdev, struct file *file) +{ + struct spmi_log_buffer *log; + struct spmi_trans *trans; + + size_t logbufsize = SZ_4K; + + /* Per file "transaction" data */ + trans = kzalloc(sizeof(*trans), GFP_KERNEL); + if (!trans) + return -ENOMEM; + + log = kzalloc(logbufsize, GFP_KERNEL); + if (!log) { + kfree(trans); + return -ENOMEM; + } + + log->rpos = 0; + log->wpos = 0; + log->len = logbufsize - sizeof(*log); + + trans->log = log; + trans->cnt = sdev->dfs_cnt; + trans->addr = sdev->dfs_addr; + trans->sdev = sdev; + trans->offset = trans->addr; + + file->private_data = trans; + return 0; +} + +static int spmi_device_dfs_data_open(struct inode *inode, struct file *file) +{ + struct spmi_device *sdev = inode->i_private; + return spmi_device_dfs_open(sdev, file); +} + +static int spmi_device_dfs_raw_data_open(struct inode *inode, struct file *file) +{ + struct spmi_device *sdev = inode->i_private; + struct spmi_trans *trans; + int rc; + + rc = spmi_device_dfs_open(sdev, file); + trans = file->private_data; + trans->raw_data = true; + return rc; +} + +static int spmi_device_dfs_close(struct inode *inode, struct file *file) +{ + struct spmi_trans *trans = file->private_data; + kfree(trans->log); + kfree(trans); + return 0; +} + +/** + * spmi_read_data: reads data across the SPMI bus + * @ctrl: The SPMI controller + * @buf: buffer to store the data read. + * @offset: SPMI address offset to start reading from. + * @cnt: The number of bytes to read. + * + * Returns 0 on success, otherwise returns error code from SPMI driver. + */ +static int +spmi_read_data(struct spmi_device *sdev, uint8_t *buf, int offset, int cnt) +{ + int ret = 0; + int len; + uint16_t addr; + + while (cnt > 0) { + addr = offset & 0xFFFF; + len = min(cnt, MAX_REG_PER_TRANSACTION); + + ret = spmi_ext_register_readl(sdev, addr, buf, len); + if (ret < 0) { + dev_err(&sdev->dev, + "SPMI read failed, err = %d\n", ret); + goto done; + } + + cnt -= len; + buf += len; + offset += len; + } + +done: + return ret; +} + +/** + * spmi_write_data: writes data across the SPMI bus + * @ctrl: The SPMI controller + * @buf: data to be written. + * @offset: SPMI address offset to start writing to. + * @cnt: The number of bytes to write. + * + * Returns 0 on success, otherwise returns error code from SPMI driver. + */ +static int +spmi_write_data(struct spmi_device *sdev, uint8_t *buf, int offset, int cnt) +{ + int ret = 0; + int len; + uint16_t addr; + + while (cnt > 0) { + addr = offset & 0xFFFF; + len = min(cnt, MAX_REG_PER_TRANSACTION); + + ret = spmi_ext_register_writel(sdev, addr, buf, len); + if (ret < 0) { + dev_err(&sdev->dev, + "SPMI write failed, err = %d\n", ret); + goto done; + } + + cnt -= len; + buf += len; + offset += len; + } + +done: + return ret; +} + +/** + * print_to_log: format a string and place into the log buffer + * @log: The log buffer to place the result into. + * @fmt: The format string to use. + * @...: The arguments for the format string. + * + * The return value is the number of characters written to @log buffer + * not including the trailing '\0'. + */ +static int print_to_log(struct spmi_log_buffer *log, const char *fmt, ...) +{ + va_list args; + int cnt; + char *buf = &log->data[log->wpos]; + size_t size = log->len - log->wpos; + + va_start(args, fmt); + cnt = vscnprintf(buf, size, fmt, args); + va_end(args); + + log->wpos += cnt; + return cnt; +} + +/** + * write_next_line_to_log: Writes a single "line" of data into the log buffer + * @trans: Pointer to SPMI transaction data. + * @offset: SPMI address offset to start reading from. + * @pcnt: Pointer to 'cnt' variable. Indicates the number of bytes to read. + * + * The 'offset' is a 20-bits SPMI address which includes a 4-bit slave id (SID), + * an 8-bit peripheral id (PID), and an 8-bit peripheral register address. + * + * On a successful read, the pcnt is decremented by the number of data + * bytes read across the SPMI bus. When the cnt reaches 0, all requested + * bytes have been read. + */ +static int +write_next_line_to_log(struct spmi_trans *trans, int offset, size_t *pcnt) +{ + int i, j; + u8 data[ITEMS_PER_LINE]; + struct spmi_log_buffer *log = trans->log; + + int cnt = 0; + int padding = offset % ITEMS_PER_LINE; + int items_to_read = min(ARRAY_SIZE(data) - padding, *pcnt); + int items_to_log = min(ITEMS_PER_LINE, padding + items_to_read); + + /* Buffer needs enough space for an entire line */ + if ((log->len - log->wpos) < MAX_LINE_LENGTH) + goto done; + + /* Read the desired number of "items" */ + if (spmi_read_data(trans->sdev, data, offset, items_to_read)) + goto done; + + *pcnt -= items_to_read; + + /* Each line starts with the aligned offset (20-bit address) */ + cnt = print_to_log(log, "%5.5X ", offset & 0xffff0); + if (cnt == 0) + goto done; + + /* If the offset is unaligned, add padding to right justify items */ + for (i = 0; i < padding; ++i) { + cnt = print_to_log(log, "-- "); + if (cnt == 0) + goto done; + } + + /* Log the data items */ + for (j = 0; i < items_to_log; ++i, ++j) { + cnt = print_to_log(log, "%2.2X ", data[j]); + if (cnt == 0) + goto done; + } + + /* If the last character was a space, then replace it with a newline */ + if (log->wpos > 0 && log->data[log->wpos - 1] == ' ') + log->data[log->wpos - 1] = '\n'; + +done: + return cnt; +} + +/** + * write_raw_data_to_log: Writes a single "line" of data into the log buffer + * @trans: Pointer to SPMI transaction data. + * @offset: SPMI address offset to start reading from. + * @pcnt: Pointer to 'cnt' variable. Indicates the number of bytes to read. + * + * The 'offset' is a 20-bits SPMI address which includes a 4-bit slave id (SID), + * an 8-bit peripheral id (PID), and an 8-bit peripheral register address. + * + * On a successful read, the pcnt is decremented by the number of data + * bytes read across the SPMI bus. When the cnt reaches 0, all requested + * bytes have been read. + */ +static int +write_raw_data_to_log(struct spmi_trans *trans, int offset, size_t *pcnt) +{ + u8 data[16]; + struct spmi_log_buffer *log = trans->log; + + int i; + int cnt = 0; + int items_to_read = min(ARRAY_SIZE(data), *pcnt); + + /* Buffer needs enough space for an entire line */ + if ((log->len - log->wpos) < 80) + goto done; + + /* Read the desired number of "items" */ + if (spmi_read_data(trans->sdev, data, offset, items_to_read)) + goto done; + + *pcnt -= items_to_read; + + /* Log the data items */ + for (i = 0; i < items_to_read; ++i) { + cnt = print_to_log(log, "0x%2.2X ", data[i]); + if (cnt == 0) + goto done; + } + + /* If the last character was a space, then replace it with a newline */ + if (log->wpos > 0 && log->data[log->wpos - 1] == ' ') + log->data[log->wpos - 1] = '\n'; + +done: + return cnt; +} + +/** + * get_log_data - reads data across the SPMI bus and saves to the log buffer + * @trans: Pointer to SPMI transaction data. + * + * Returns the number of "items" read or SPMI error code for read failures. + */ +static int get_log_data(struct spmi_trans *trans) +{ + int cnt; + int last_cnt; + int items_read; + int total_items_read = 0; + u32 offset = trans->offset; + size_t item_cnt = trans->cnt; + struct spmi_log_buffer *log = trans->log; + int (*write_to_log)(struct spmi_trans *, int, size_t *); + + if (item_cnt == 0) + return 0; + + if (trans->raw_data) + write_to_log = write_raw_data_to_log; + else + write_to_log = write_next_line_to_log; + + /* Reset the log buffer 'pointers' */ + log->wpos = log->rpos = 0; + + /* Keep reading data until the log is full */ + do { + last_cnt = item_cnt; + cnt = write_to_log(trans, offset, &item_cnt); + items_read = last_cnt - item_cnt; + offset += items_read; + total_items_read += items_read; + } while (cnt && item_cnt > 0); + + /* Adjust the transaction offset and count */ + trans->cnt = item_cnt; + trans->offset += total_items_read; + + return total_items_read; +} + +static ssize_t spmi_device_dfs_reg_write(struct file *file, + const char __user *buf, + size_t count, loff_t *ppos) +{ + int bytes_read; + int data; + int pos = 0; + int cnt = 0; + u8 *values; + size_t ret = 0; + + struct spmi_trans *trans = file->private_data; + struct spmi_device *sdev = trans->sdev; + u32 offset = trans->offset; + + /* Make a copy of the user data */ + char *kbuf = kmalloc(count + 1, GFP_KERNEL); + if (!kbuf) + return -ENOMEM; + + if (copy_from_user(kbuf, buf, count)) { + ret = -EFAULT; + goto free_buf; + } + + *ppos += count; + kbuf[count] = '\0'; + + /* Override the text buffer with the raw data */ + values = kbuf; + + /* Parse the data in the buffer. It should be a string of numbers */ + while (sscanf(kbuf + pos, "%i%n", &data, &bytes_read) == 1) { + pos += bytes_read; + values[cnt++] = data & 0xff; + } + + if (!cnt) + goto free_buf; + + /* Perform the SPMI write(s) */ + ret = spmi_write_data(trans->sdev, values, offset, cnt); + + if (ret) { + dev_err(&sdev->dev, "SPMI write failed, err = %zu\n", ret); + } else { + ret = count; + trans->offset += cnt; + } + +free_buf: + kfree(kbuf); + return ret; +} + +static ssize_t spmi_device_dfs_reg_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + struct spmi_trans *trans = file->private_data; + struct spmi_device *sdev = trans->sdev; + struct spmi_log_buffer *log = trans->log; + size_t len; + + /* Is the the log buffer empty */ + if (log->rpos >= log->wpos) { + if (get_log_data(trans) <= 0) + return 0; + } + + len = min(count, (size_t) log->wpos - log->rpos); + + if (copy_to_user(buf, &log->data[log->rpos], len)) + return -EFAULT; + + *ppos += len; + log->rpos += len; + return len; +} + +static const struct file_operations spmi_dfs_reg_fops = { + .open = spmi_device_dfs_data_open, + .release = spmi_device_dfs_close, + .read = spmi_device_dfs_reg_read, + .write = spmi_device_dfs_reg_write, +}; + +static const struct file_operations spmi_dfs_raw_data_fops = { + .open = spmi_device_dfs_raw_data_open, + .release = spmi_device_dfs_close, + .read = spmi_device_dfs_reg_read, + .write = spmi_device_dfs_reg_write, +}; + +void spmi_dfs_controller_add(struct spmi_controller *ctrl) +{ + ctrl->dfs_dir = debugfs_create_dir(dev_name(&ctrl->dev), + spmi_debug_root); + WARN_ON(!ctrl->dfs_dir); + + dev_dbg(&ctrl->dev, "adding debug entries for spmi controller\n"); +} + +void spmi_dfs_controller_remove(struct spmi_controller *ctrl) +{ + debugfs_remove_recursive(ctrl->dfs_dir); +} + +void spmi_dfs_device_add(struct spmi_device *sdev) +{ + struct dentry *file; + + dev_dbg(&sdev->dev, "adding debugfs entries for spmi device\n"); + + sdev->dfs_dir = debugfs_create_dir(dev_name(&sdev->dev), + sdev->ctrl->dfs_dir); + if (WARN_ON(!sdev->dfs_dir)) + return; + + sdev->dfs_cnt = 1; + + file = debugfs_create_u32("count", DFS_MODE, sdev->dfs_dir, + &sdev->dfs_cnt); + if (WARN_ON(!file)) + goto err_remove_fs; + + file = debugfs_create_x32("address", DFS_MODE, sdev->dfs_dir, + &sdev->dfs_addr); + if (WARN_ON(!file)) + goto err_remove_fs; + + file = debugfs_create_file("data", DFS_MODE, sdev->dfs_dir, sdev, + &spmi_dfs_reg_fops); + if (WARN_ON(!file)) + goto err_remove_fs; + + file = debugfs_create_file("data_raw", DFS_MODE, sdev->dfs_dir, + sdev, &spmi_dfs_raw_data_fops); + if (WARN_ON(!file)) + goto err_remove_fs; + + return; + +err_remove_fs: + debugfs_remove_recursive(sdev->dfs_dir); +} + +void spmi_dfs_device_remove(struct spmi_device *sdev) +{ + dev_dbg(&sdev->dev, "Deleting device\n"); + debugfs_remove_recursive(sdev->dfs_dir); +} + +void __exit spmi_dfs_exit(void) +{ + debugfs_remove_recursive(spmi_debug_root); +} + +void __init spmi_dfs_init(void) +{ + struct dentry *help; + + spmi_debug_root = debugfs_create_dir("spmi", NULL); + + help = debugfs_create_blob("help", S_IRUGO, spmi_debug_root, + &spmi_debug_help); + + WARN_ON(!spmi_debug_root || !help); +} + +MODULE_LICENSE("GPL v2"); diff --git a/drivers/spmi/spmi-dbgfs.h b/drivers/spmi/spmi-dbgfs.h new file mode 100644 index 0000000..d3162fb --- /dev/null +++ b/drivers/spmi/spmi-dbgfs.h @@ -0,0 +1,25 @@ +/* Copyright (c) 2012-2013, 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. + */ +#ifndef _SPMI_DBGFS_H +#define _SPMI_DBGFS_H + +struct spmi_controller; +struct spmi_device; + +void __init spmi_dfs_init(void); +void __exit spmi_dfs_exit(void); +void spmi_dfs_controller_add(struct spmi_controller *ctrl); +void spmi_dfs_controller_remove(struct spmi_controller *ctrl); +void spmi_dfs_device_add(struct spmi_device *sdev); +void spmi_dfs_device_remove(struct spmi_device *sdev); + +#endif /* _SPMI_DBGFS_H */ diff --git a/drivers/spmi/spmi.c b/drivers/spmi/spmi.c new file mode 100644 index 0000000..c3da65e --- /dev/null +++ b/drivers/spmi/spmi.c @@ -0,0 +1,491 @@ +/* Copyright (c) 2012-2013, 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "spmi-dbgfs.h" + +static DEFINE_MUTEX(ctrl_idr_lock); +static DEFINE_IDR(ctrl_idr); + +static void spmi_dev_release(struct device *dev) +{ + struct spmi_device *sdev = to_spmi_device(dev); + spmi_dfs_device_remove(sdev); + kfree(sdev); +} + +static 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); + spmi_dfs_controller_remove(ctrl); + mutex_lock(&ctrl_idr_lock); + idr_remove(&ctrl_idr, ctrl->nr); + mutex_unlock(&ctrl_idr_lock); + kfree(ctrl); +} + +static struct device_type spmi_ctrl_type = { + .release = spmi_ctrl_release, +}; + +#ifdef CONFIG_PM_SLEEP +static int spmi_pm_suspend(struct device *dev) +{ + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + if (pm) + return pm_generic_suspend(dev); + else + return 0; +} + +static int spmi_pm_resume(struct device *dev) +{ + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + if (pm) + return pm_generic_resume(dev); + else + return 0; +} +#else +#define spmi_pm_suspend NULL +#define spmi_pm_resume NULL +#endif + +static const struct dev_pm_ops spmi_pm_ops = { + .suspend = spmi_pm_suspend, + .resume = spmi_pm_resume, + SET_RUNTIME_PM_OPS( + pm_generic_suspend, + pm_generic_resume, + pm_generic_runtime_idle + ) +}; + +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; +} + +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; + } + + spmi_dfs_device_add(sdev); + + dev_dbg(&sdev->dev, "device %s registered\n", dev_name(&sdev->dev)); + +err_device_add: + return err; +} +EXPORT_SYMBOL_GPL(spmi_device_add); + +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) +{ + if (!ctrl || !ctrl->cmd || ctrl->dev.type != &spmi_ctrl_type) + return -EINVAL; + + return ctrl->cmd(ctrl, opcode, sid); +} + +static inline int spmi_read_cmd(struct spmi_controller *ctrl, + u8 opcode, u8 sid, u16 addr, u8 bc, u8 *buf) +{ + if (!ctrl || !ctrl->read_cmd || ctrl->dev.type != &spmi_ctrl_type) + return -EINVAL; + + return ctrl->read_cmd(ctrl, opcode, sid, addr, bc, buf); +} + +static inline int spmi_write_cmd(struct spmi_controller *ctrl, + u8 opcode, u8 sid, u16 addr, u8 bc, u8 *buf) +{ + if (!ctrl || !ctrl->write_cmd || ctrl->dev.type != &spmi_ctrl_type) + return -EINVAL; + + return ctrl->write_cmd(ctrl, opcode, sid, addr, bc, buf); +} + +/* + * register read/write: 5-bit address, 1 byte of data + * extended register read/write: 8-bit address, up to 16 bytes of data + * extended register read/write long: 16-bit address, up to 8 bytes of data + */ + +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, 0, + buf); +} +EXPORT_SYMBOL_GPL(spmi_register_read); + +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, + len - 1, buf); +} +EXPORT_SYMBOL_GPL(spmi_ext_register_read); + +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, + len - 1, buf); +} +EXPORT_SYMBOL_GPL(spmi_ext_register_readl); + +int spmi_register_write(struct spmi_device *sdev, u8 addr, u8 *buf) +{ + /* 5-bit register address */ + if (addr > 0x1F) + return -EINVAL; + + return spmi_write_cmd(sdev->ctrl, SPMI_CMD_WRITE, sdev->usid, addr, 0, + buf); +} +EXPORT_SYMBOL_GPL(spmi_register_write); + +int spmi_register_zero_write(struct spmi_device *sdev, u8 data) +{ + return spmi_write_cmd(sdev->ctrl, SPMI_CMD_ZERO_WRITE, sdev->usid, 0, + 0, &data); +} +EXPORT_SYMBOL_GPL(spmi_register_zero_write); + +int spmi_ext_register_write(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_write_cmd(sdev->ctrl, SPMI_CMD_EXT_WRITE, sdev->usid, addr, + len - 1, buf); +} +EXPORT_SYMBOL_GPL(spmi_ext_register_write); + +int spmi_ext_register_writel(struct spmi_device *sdev, u16 addr, u8 *buf, + size_t len) +{ + /* 4-bit Slave Identifier, 16-bit register address, up to 8 bytes */ + if (len == 0 || len > 8) + return -EINVAL; + + return spmi_write_cmd(sdev->ctrl, SPMI_CMD_EXT_WRITEL, sdev->usid, + addr, len - 1, buf); +} +EXPORT_SYMBOL_GPL(spmi_ext_register_writel); + +int spmi_command_reset(struct spmi_device *sdev) +{ + return spmi_cmd(sdev->ctrl, SPMI_CMD_RESET, sdev->usid); +} +EXPORT_SYMBOL_GPL(spmi_command_reset); + +int spmi_command_sleep(struct spmi_device *sdev) +{ + return spmi_cmd(sdev->ctrl, SPMI_CMD_SLEEP, sdev->usid); +} +EXPORT_SYMBOL_GPL(spmi_command_sleep); + +int spmi_command_wakeup(struct spmi_device *sdev) +{ + return spmi_cmd(sdev->ctrl, SPMI_CMD_WAKEUP, sdev->usid); +} +EXPORT_SYMBOL_GPL(spmi_command_wakeup); + +int spmi_command_shutdown(struct spmi_device *sdev) +{ + return spmi_cmd(sdev->ctrl, SPMI_CMD_SHUTDOWN, sdev->usid); +} +EXPORT_SYMBOL_GPL(spmi_command_shutdown); + +static int spmi_drv_probe(struct device *dev) +{ + const struct spmi_driver *sdrv = to_spmi_driver(dev->driver); + int err = 0; + + if (sdrv->probe) + err = sdrv->probe(to_spmi_device(dev)); + + return err; +} + +static int spmi_drv_remove(struct device *dev) +{ + const struct spmi_driver *sdrv = to_spmi_driver(dev->driver); + int err = 0; + + if (sdrv->remove) + err = sdrv->remove(to_spmi_device(dev)); + + return err; +} + +static void spmi_drv_shutdown(struct device *dev) +{ + const struct spmi_driver *sdrv = to_spmi_driver(dev->driver); + + if (sdrv->shutdown) + sdrv->shutdown(to_spmi_device(dev)); +} + +static struct bus_type spmi_bus_type = { + .name = "spmi", + .match = spmi_device_match, + .pm = &spmi_pm_ops, + .probe = spmi_drv_probe, + .remove = spmi_drv_remove, + .shutdown = spmi_drv_shutdown, +}; + +struct spmi_device *spmi_device_alloc(struct spmi_controller *ctrl) +{ + struct spmi_device *sdev; + + sdev = kzalloc(sizeof(*sdev), GFP_KERNEL); + if (!sdev) + return NULL; + + sdev->ctrl = ctrl; + device_initialize(&sdev->dev); + sdev->dev.parent = &ctrl->dev; + sdev->dev.bus = &spmi_bus_type; + sdev->dev.type = &spmi_dev_type; + return sdev; +} +EXPORT_SYMBOL_GPL(spmi_device_alloc); + +struct spmi_controller *spmi_controller_alloc(struct device *parent, + size_t size) +{ + struct spmi_controller *ctrl; + int id; + + if (WARN_ON(!parent)) + return NULL; + + ctrl = kzalloc(sizeof(*ctrl) + size, GFP_KERNEL); + if (!ctrl) + return NULL; + + device_initialize(&ctrl->dev); + ctrl->dev.type = &spmi_ctrl_type; + ctrl->dev.bus = &spmi_bus_type; + ctrl->dev.parent = parent; + ctrl->dev.of_node = parent->of_node; + spmi_controller_set_drvdata(ctrl, &ctrl[1]); + + idr_preload(GFP_KERNEL); + mutex_lock(&ctrl_idr_lock); + id = idr_alloc(&ctrl_idr, ctrl, 0, 0, GFP_NOWAIT); + mutex_unlock(&ctrl_idr_lock); + idr_preload_end(); + + if (id < 0) { + dev_err(parent, + "unable to allocate SPMI controller identifier.\n"); + spmi_controller_put(ctrl); + return NULL; + } + + ctrl->nr = id; + dev_set_name(&ctrl->dev, "spmi-%d", id); + + dev_dbg(&ctrl->dev, "allocated controller 0x%p id %d\n", ctrl, id); + return ctrl; +} +EXPORT_SYMBOL_GPL(spmi_controller_alloc); + +static int of_spmi_register_devices(struct spmi_controller *ctrl) +{ + struct device_node *node; + int err; + + dev_dbg(&ctrl->dev, "of_spmi_register_devices\n"); + + if (!ctrl->dev.of_node) + return -ENODEV; + + dev_dbg(&ctrl->dev, "looping through children\n"); + + for_each_available_child_of_node(ctrl->dev.of_node, node) { + struct spmi_device *sdev; + u32 usid; + + dev_dbg(&ctrl->dev, "adding child %s\n", node->full_name); + + err = of_property_read_u32(node, "reg", &usid); + if (err) { + dev_err(&ctrl->dev, + "node %s does not have 'reg' property\n", + node->full_name); + continue; + } + + if (usid > 0xFF) { + dev_err(&ctrl->dev, + "invalid usid on node %s\n", + node->full_name); + continue; + } + + dev_dbg(&ctrl->dev, "read usid %02x\n", usid); + + sdev = spmi_device_alloc(ctrl); + if (!sdev) + continue; + + sdev->dev.of_node = node; + sdev->usid = (u8) usid; + + err = spmi_device_add(sdev); + if (err) { + dev_err(&sdev->dev, + "failure adding device. status %d\n", err); + spmi_device_put(sdev); + continue; + } + } + + return 0; +} + +int spmi_controller_add(struct spmi_controller *ctrl) +{ + int ret; + + /* Can't register until after driver model init */ + if (WARN_ON(!spmi_bus_type.p)) + return -EAGAIN; + + ret = device_add(&ctrl->dev); + if (ret) + return ret; + + spmi_dfs_controller_add(ctrl); + + if (IS_ENABLED(CONFIG_OF)) + of_spmi_register_devices(ctrl); + + dev_dbg(&ctrl->dev, "spmi-%d registered: dev:%p\n", + ctrl->nr, &ctrl->dev); + + return 0; +}; +EXPORT_SYMBOL_GPL(spmi_controller_add); + +/* 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: Controller tear-down. + * @ctrl: controller to be removed. + * + * Controller added with the above API is torn down using this API. + */ +int spmi_controller_remove(struct spmi_controller *ctrl) +{ + int dummy; + + if (!ctrl) + return -EINVAL; + + dummy = device_for_each_child(&ctrl->dev, NULL, + spmi_ctrl_remove_device); + device_unregister(&ctrl->dev); + return 0; +} +EXPORT_SYMBOL_GPL(spmi_controller_remove); + +int spmi_driver_register(struct spmi_driver *drv) +{ + drv->driver.bus = &spmi_bus_type; + return driver_register(&drv->driver); +} +EXPORT_SYMBOL_GPL(spmi_driver_register); + +static void __exit spmi_exit(void) +{ + bus_unregister(&spmi_bus_type); + spmi_dfs_exit(); +} +module_exit(spmi_exit); + +static int __init spmi_init(void) +{ + spmi_dfs_init(); + return bus_register(&spmi_bus_type); +} +postcore_initcall(spmi_init); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("SPMI module"); +MODULE_ALIAS("platform:spmi"); diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h index 45e9214..677e474 100644 --- a/include/linux/mod_devicetable.h +++ b/include/linux/mod_devicetable.h @@ -432,6 +432,14 @@ struct spi_device_id { kernel_ulong_t driver_data; /* Data private to the driver */ }; +#define SPMI_NAME_SIZE 32 +#define SPMI_MODULE_PREFIX "spmi:" + +struct spmi_device_id { + char name[SPMI_NAME_SIZE]; + kernel_ulong_t driver_data; /* Data private to the driver */ +}; + /* dmi */ enum dmi_field { DMI_NONE, diff --git a/include/linux/spmi.h b/include/linux/spmi.h new file mode 100644 index 0000000..8b9c232 --- /dev/null +++ b/include/linux/spmi.h @@ -0,0 +1,355 @@ +/* Copyright (c) 2012-2013, 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. + */ +#ifndef _LINUX_SPMI_H +#define _LINUX_SPMI_H + +#include +#include +#include + +/* Maximum slave identifier */ +#define SPMI_MAX_SLAVE_ID 16 + +/* SPMI Commands */ +#define SPMI_CMD_EXT_WRITE 0x00 +#define SPMI_CMD_RESET 0x10 +#define SPMI_CMD_SLEEP 0x11 +#define SPMI_CMD_SHUTDOWN 0x12 +#define SPMI_CMD_WAKEUP 0x13 +#define SPMI_CMD_AUTHENTICATE 0x14 +#define SPMI_CMD_MSTR_READ 0x15 +#define SPMI_CMD_MSTR_WRITE 0x16 +#define SPMI_CMD_TRANSFER_BUS_OWNERSHIP 0x1A +#define SPMI_CMD_DDB_MASTER_READ 0x1B +#define SPMI_CMD_DDB_SLAVE_READ 0x1C +#define SPMI_CMD_EXT_READ 0x20 +#define SPMI_CMD_EXT_WRITEL 0x30 +#define SPMI_CMD_EXT_READL 0x38 +#define SPMI_CMD_WRITE 0x40 +#define SPMI_CMD_READ 0x60 +#define SPMI_CMD_ZERO_WRITE 0x80 + +/** + * Client/device handle (struct spmi_device): + * This is the client/device handle returned when a SPMI device + * is registered with a controller. + * Pointer to this structure is used by client-driver as a handle. + * @dev: Driver model representation of the device. + * @ctrl: SPMI controller managing the bus hosting this device. + * @usid: Unique Slave IDentifier. + * @dfs_dir: dentry for this device in debugfs + * @dfs_cnt: number of bytes to access for a debugfs operation + * @dfs_addr: address to access for a debugfs operation + */ +struct spmi_device { + struct device dev; + struct spmi_controller *ctrl; + u8 usid; + +#if CONFIG_DEBUG_FS + struct dentry *dfs_dir; + u32 dfs_cnt; + u32 dfs_addr; +#endif +}; +#define to_spmi_device(d) container_of(d, struct spmi_device, dev) + +static inline void *spmi_device_get_drvdata(const struct spmi_device *sdev) +{ + return dev_get_drvdata(&sdev->dev); +} + +static inline void spmi_device_set_drvdata(struct spmi_device *sdev, void *data) +{ + dev_set_drvdata(&sdev->dev, data); +} + +/** + * spmi_controller_alloc: Allocate a new SPMI controller + * @ctrl: associated controller + * + * Caller is responsible for either calling spmi_device_add() to add the + * newly allocated controller, or calling spmi_device_put() to discard it. + */ +struct spmi_device *spmi_device_alloc(struct spmi_controller *ctrl); + +static inline void spmi_device_put(struct spmi_device *sdev) +{ + if (sdev) + put_device(&sdev->dev); +} + +/** + * 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); + +/** + * spmi_device_remove: remove a device + * @sdev: spmi_device to be removed + */ +void spmi_device_remove(struct spmi_device *sdev); + +/** + * struct spmi_controller: interface to the SPMI master controller + * @dev: Driver model representation of the device. + * @nr: board-specific number identifier for this controller/bus + * @cmd: sends a non-data command sequence on the SPMI bus. + * @read_cmd: sends a register read command sequence on the SPMI bus. + * @write_cmd: sends a register write command sequence on the SPMI bus. + * @dfs_dir: dentry for controller directory in debugfs + */ +struct spmi_controller { + struct device dev; + unsigned int nr; + int (*cmd)(struct spmi_controller *ctrl, u8 opcode, u8 sid); + int (*read_cmd)(struct spmi_controller *ctrl, u8 opcode, + u8 sid, u16 addr, u8 bc, u8 *buf); + int (*write_cmd)(struct spmi_controller *ctrl, u8 opcode, + u8 sid, u16 addr, u8 bc, u8 *buf); +#if CONFIG_DEBUG_FS + struct dentry *dfs_dir; +#endif +}; +#define to_spmi_controller(d) container_of(d, struct spmi_controller, dev) + +static inline +void *spmi_controller_get_drvdata(const struct spmi_controller *ctrl) +{ + return dev_get_drvdata(&ctrl->dev); +} + +static inline void spmi_controller_set_drvdata(struct spmi_controller *ctrl, + void *data) +{ + dev_set_drvdata(&ctrl->dev, data); +} + +/** + * spmi_controller_alloc: Allocate a new SPMI controller + * @parent: parent device + * @size: size of private data + * + * Caller is responsible for either calling spmi_controller_add() to add the + * newly allocated controller, or calling spmi_controller_put() to discard it. + */ +struct spmi_controller *spmi_controller_alloc(struct device *parent, + size_t size); + +static inline void spmi_controller_put(struct spmi_controller *ctrl) +{ + if (ctrl) + put_device(&ctrl->dev); +} + +/** + * spmi_controller_add: Controller bring-up. + * @ctrl: controller to be registered. + * + * Register a controller previously allocated via spmi_controller_alloc() with + * the SPMI core + */ +int spmi_controller_add(struct spmi_controller *ctrl); + +/** + * spmi_controller_remove: Controller tear-down. + * + * Remove a SPMI controller. + */ +int spmi_controller_remove(struct spmi_controller *ctrl); + +/** + * struct spmi_driver: Manage SPMI generic/slave device driver + * @driver: SPMI device drivers should initialize name and owner field of + * this structure + * @probe: binds this driver to a SPMI device. + * @remove: unbinds this driver from the SPMI device. + * @shutdown: standard shutdown callback used during powerdown/halt. + * @suspend: standard suspend callback used during system suspend + * @resume: standard resume callback used during system resume + */ +struct spmi_driver { + struct device_driver driver; + int (*probe)(struct spmi_device *sdev); + int (*remove)(struct spmi_device *sdev); + void (*shutdown)(struct spmi_device *sdev); + int (*suspend)(struct spmi_device *sdev, pm_message_t pmesg); + int (*resume)(struct spmi_device *sdev); +}; +#define to_spmi_driver(d) container_of(d, struct spmi_driver, driver) + +/** + * spmi_driver_register: Client driver registration with SPMI framework. + * @sdrv: client driver to be associated with client-device. + * + * This API will register the client driver with the SPMI framework. + * It is called from the driver's module-init function. + */ +int spmi_driver_register(struct spmi_driver *sdrv); + +/** + * spmi_driver_unregister - reverse effect of spmi_driver_register + * @sdrv: the driver to unregister + * Context: can sleep + */ +static inline void spmi_driver_unregister(struct spmi_driver *sdrv) +{ + if (sdrv) + driver_unregister(&sdrv->driver); +} + +#define module_spmi_driver(__spmi_driver) \ + module_driver(__spmi_driver, spmi_driver_register, \ + spmi_driver_unregister) + +/** + * 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); + +/** + * 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); + +/** + * 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); + +/** + * spmi_register_write() - register write + * @sdev: SPMI device + * @addr: slave register address (5-bit address). + * @buf: 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 *buf); + +/** + * 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); + +/** + * 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, u8 *buf, + size_t len); + +/** + * spmi_ext_register_writel() - extended register write long + * @sdev: SPMI device + * @addr: slave register address (16-bit address). + * @buf: buffer containing the data to be transferred to the Slave. + * @len: the request number of bytes to read (up to 8 bytes). + * + * Writes up to 8 bytes of data to the extended register space of a + * Slave device using 16-bit address. + */ +int spmi_ext_register_writel(struct spmi_device *sdev, u16 addr, + u8 *buf, size_t len); + +/** + * spmi_command_reset() - sends RESET command to the specified slave + * @sdev: SPMI device + * + * The Reset command initializes the Slave and forces all registers to + * their reset values. The Slave shall enter the STARTUP state after + * receiving a Reset command. + * + * Returns + * -EINVAL for invalid slave identifier. + * -EPERM if the SPMI transaction is denied due to permission issues. + * -EIO if the SPMI transaction fails (parity errors, etc). + * -ETIMEDOUT if the SPMI transaction times out. + */ +int spmi_command_reset(struct spmi_device *sdev); + +/** + * spmi_command_sleep() - sends SLEEP command to the specified slave + * @sdev: SPMI device + * + * The Sleep command causes the Slave to enter the user defined SLEEP state. + * + * Returns + * -EINVAL for invalid slave identifier. + * -EPERM if the SPMI transaction is denied due to permission issues. + * -EIO if the SPMI transaction fails (parity errors, etc). + * -ETIMEDOUT if the SPMI transaction times out. + */ +int spmi_command_sleep(struct spmi_device *sdev); + +/** + * spmi_command_wakeup() - sends WAKEUP command to the specified slave + * @sdev: SPMI device + * + * The Wakeup command causes the Slave to move from the SLEEP state to + * the ACTIVE state. + * + * Returns + * -EINVAL for invalid slave identifier. + * -EPERM if the SPMI transaction is denied due to permission issues. + * -EIO if the SPMI transaction fails (parity errors, etc). + * -ETIMEDOUT if the SPMI transaction times out. + */ +int spmi_command_wakeup(struct spmi_device *sdev); + +/** + * spmi_command_shutdown() - sends SHUTDOWN command to the specified slave + * @sdev: SPMI device + * + * The Shutdown command causes the Slave to enter the SHUTDOWN state. + * + * Returns + * -EINVAL for invalid slave identifier. + * -EPERM if the SPMI transaction is denied due to permission issues. + * -EIO if the SPMI transaction fails (parity errors, etc). + * -ETIMEDOUT if the SPMI transaction times out. + */ +int spmi_command_shutdown(struct spmi_device *sdev); + +#endif -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/