[PATCH RFC v2 2/5] spmi: Linux driver framework for SPMI
Josh Cartwright
joshc at codeaurora.org
Fri Aug 9 16:37:09 EDT 2013
From: Kenneth Heitke <kheitke at codeaurora.org>
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 at codeaurora.org>
Signed-off-by: Michael Bohan <mbohan at codeaurora.org>
Signed-off-by: Josh Cartwright <joshc at codeaurora.org>
---
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 <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/debugfs.h>
+#include <linux/spmi.h>
+#include <linux/ctype.h>
+#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 <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/module.h>
+#include <linux/pm_runtime.h>
+
+#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 <linux/types.h>
+#include <linux/device.h>
+#include <linux/mod_devicetable.h>
+
+/* 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
--
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