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Message-Id: <1309497556-7344-4-git-send-email-cheiny@synaptics.com>
Date: Thu, 30 Jun 2011 22:19:10 -0700
From: Christopher Heiny <cheiny@...aptics.com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Jean Delvare <khali@...ux-fr.org>,
Linux Kernel <linux-kernel@...r.kernel.org>,
Linux Input <linux-input@...r.kernel.org>,
Christopher Heiny <cheiny@...aptics.com>,
Allie Xiong <axiong@...aptics.com>,
William Manson <wmanson@...aptics.com>,
Peichen Chang <peichen.chang@...aptics.com>,
Joerie de Gram <j.de.gram@...il.com>,
Wolfram Sang <w.sang@...gutronix.de>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Linus Walleij <linus.walleij@...ricsson.com>,
Naveen Kumar Gaddipati <naveen.gaddipati@...ricsson.com>
Subject: [PATCH 3/9] input/touchscreen: Synaptics RMI4 Touchscreen Driver
Driver for Synaptics touchscreens using RMI4 protocol.
Please see the email 0/9 for a description of this patch.
Signed-off-by: Christopher Heiny <cheiny@...aptics.com>
Signed-off-by: William Manson <wmanson@...aptics.com>
Signed-off-by: Allie Xiong <axiong@...aptics.com>
Signed-off-by: Peichen Chang <peichen.chang@...aptics.com>
Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Linus Walleij <linus.walleij@...ricsson.com>
Cc: Naveen Kumar Gaddipati <naveen.gaddipati@...ricsson.com>
Cc: Joeri de Gram <j.de.gram@...il.com>
Acked-by: Jean Delvare <khali@...ux-fr.org>
---
diff --git a/drivers/input/touchscreen/rmi_function.c b/drivers/input/touchscreen/rmi_function.c
new file mode 100644
index 0000000..e0f0bb1
--- /dev/null
+++ b/drivers/input/touchscreen/rmi_function.c
@@ -0,0 +1,289 @@
+/**
+ * Synaptics Register Mapped Interface (RMI4) - RMI Function Module.
+ * Copyright (C) 2007 - 2011, Synaptics Incorporated
+ *
+ */
+/*
+ * This file is licensed under the GPL2 license.
+ *
+ *#############################################################################
+ * GPL
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License 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/device.h>
+#include <linux/hrtimer.h>
+#include <linux/miscdevice.h>
+#include <linux/fs.h>
+#include <linux/delay.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+
+#include "rmi_drvr.h"
+#include "rmi_function.h"
+#include "rmi_bus.h"
+#include "rmi_sensor.h"
+#include "rmi_f01.h"
+#include "rmi_f05.h"
+#include "rmi_f11.h"
+#include "rmi_f19.h"
+#include "rmi_f34.h"
+
+
+#define FUNCTION_NAME_SIZE 10
+
+static int rmi_function_suspendable(struct rmi_function_info *rmifninfo);
+
+
+/* NOTE: Developer - add in any new RMI4 fn data info - function number
+ * and ptrs to report, config, init and detect functions. This data is
+ * used to point to the functions that need to be called to config, init,
+ * detect and report data for the new RMI4 function. Refer to the RMI4
+ * specification for information on RMI4 functions.
+ */
+/* TODO: This will eventually be built dynamically, as individual function
+ * implementations registered. For now, though we create it statically. */
+static struct rmi_function_ops supported_functions[] = {
+ /* Fn $01 - device control */
+ {
+ .function_number = RMI_F01_INDEX,
+ .inthandler = FN_01_inthandler,
+ .config = FN_01_config,
+ .init = FN_01_init,
+ .detect = FN_01_detect,
+ .attention = FN_01_attention,
+ .suspend = FN_01_suspend,
+ .resume = FN_01_resume,
+ .suspendable = rmi_function_suspendable},
+ /* Fn $05 - analog report */
+ {
+ .function_number = RMI_F05_INDEX,
+ .inthandler = FN_05_inthandler,
+ .config = FN_05_config,
+ .init = FN_05_init,
+ .detect = FN_05_detect,
+ .attention = NULL,
+ .suspend = NULL,
+ .resume = NULL,
+ .suspendable = rmi_function_suspendable},
+ /* Fn $11 - 2D sensing */
+ {
+ .function_number = RMI_F11_INDEX,
+ .inthandler = FN_11_inthandler,
+ .config = FN_11_config,
+ .init = FN_11_init,
+ .detect = FN_11_detect,
+ .attention = NULL,
+ .suspend = NULL,
+ .resume = NULL,
+ .suspendable = rmi_function_suspendable},
+ /* Fn $19 - buttons */
+ {
+ .function_number = RMI_F19_INDEX,
+ .inthandler = FN_19_inthandler,
+ .config = FN_19_config,
+ .init = FN_19_init,
+ .detect = FN_19_detect,
+ .attention = NULL,
+ .suspend = NULL,
+ .resume = NULL,
+ .suspendable = rmi_function_suspendable},
+ /* Fn $34 - firmware reflash */
+ {
+ .function_number = RMI_F34_INDEX,
+ .inthandler = FN_34_inthandler,
+ .config = FN_34_config,
+ .init = FN_34_init,
+ .detect = FN_34_detect,
+ .attention = FN_34_attention,
+ .suspend = NULL,
+ .resume = NULL,
+ .suspendable = rmi_function_suspendable},
+};
+
+/* This function is here to provide a way for external modules to access the
+ * functions list. It will try to find a matching function base on the passed
+ * in RMI4 function number and return the pointer to the struct rmi_functions
+ * if a match is found or NULL if not found.
+ */
+struct rmi_function_ops *rmi_find_function(int function_number)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(supported_functions); i++) {
+ if (function_number == supported_functions[i].function_number)
+ return &supported_functions[i];
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL(rmi_find_function);
+
+static int rmi_function_suspendable(struct rmi_function_info *rmifninfo)
+{
+ return 1;
+}
+
+static void rmi_function_config(struct rmi_function_device *function)
+{
+ pr_debug("%s: rmi_function_config", __func__);
+}
+
+/* Just a stub for now.
+ */
+static int rmi_function_suspend(struct device *dev, pm_message_t state)
+{
+ pr_info("%s: function suspend called.", __func__);
+ return 0;
+}
+
+/* Just a stub for now.
+ */
+static int rmi_function_resume(struct device *dev)
+{
+ pr_info("%s: function resume called.", __func__);
+ return 0;
+}
+
+int rmi_function_register_driver(struct rmi_function_driver *drv,
+ int function_number)
+{
+ int retval = 0;
+ char *driver_name;
+
+ pr_info("%s: Registering function driver for F%02x.\n", __func__,
+ function_number);
+
+
+ /* Create a function device and function driver for this Fn */
+ driver_name = kzalloc(FUNCTION_NAME_SIZE, GFP_KERNEL);
+ if (!driver_name) {
+ pr_err("%s: Error allocating memory for "
+ "rmi_function_driver name.", __func__);
+ return -ENOMEM;
+ }
+ snprintf(driver_name, FUNCTION_NAME_SIZE, "fn%02x", function_number);
+
+ drv->drv.name = driver_name;
+ drv->module = drv->drv.owner;
+
+ drv->drv.suspend = rmi_function_suspend;
+ drv->drv.resume = rmi_function_resume;
+
+ /* register the sensor driver */
+ retval = driver_register(&drv->drv);
+ if (retval) {
+ pr_err("%s: Failed driver_register %d\n", __func__, retval);
+ drv->drv.name = NULL;
+ kfree(driver_name);
+ }
+
+ return retval;
+}
+EXPORT_SYMBOL(rmi_function_register_driver);
+
+void rmi_function_unregister_driver(struct rmi_function_driver *drv)
+{
+ char *driver_name = (char *) drv->drv.name;
+
+ pr_info("%s: Unregistering function driver.\n", __func__);
+
+ /* TODO: Unregister the devices first. */
+ driver_unregister(&drv->drv);
+ kfree(driver_name);
+}
+EXPORT_SYMBOL(rmi_function_unregister_driver);
+
+int rmi_function_register_device(struct rmi_function_device *function_device,
+ int fnNumber)
+{
+ struct input_dev *input;
+ int retval = 0;
+
+ pr_info("%s: Registering function device for F%02x.\n", __func__,
+ fnNumber);
+
+ /* make name - fn11, fn19, etc. */
+ dev_set_name(&function_device->dev, "%sfn%02x",
+ function_device->sensor->drv.name, fnNumber);
+ dev_set_drvdata(&function_device->dev, function_device);
+ retval = device_register(&function_device->dev);
+ if (retval) {
+ pr_err("%s: Failed device_register for function device.\n",
+ __func__);
+ return retval;
+ }
+
+ input = input_allocate_device();
+ if (input == NULL) {
+ pr_err("%s: Failed to allocate memory for a "
+ "new input device.\n", __func__);
+ retval = -ENOMEM;
+ goto error_exit;
+ }
+
+ input->name = dev_name(&function_device->dev);
+ input->phys = "rmi_function";
+ function_device->input = input;
+
+ /* init any input specific params for this function */
+ function_device->rmi_funcs->init(function_device);
+
+ retval = input_register_device(input);
+ if (retval) {
+ pr_err("%s: Failed input_register_device.\n", __func__);
+ goto error_exit;
+ }
+
+ rmi_function_config(function_device);
+
+ return retval;
+
+error_exit:
+ kfree(input);
+ return retval;
+}
+EXPORT_SYMBOL(rmi_function_register_device);
+
+void rmi_function_unregister_device(struct rmi_function_device *dev)
+{
+ pr_info("%s: Unregistering function device.n", __func__);
+
+ input_unregister_device(dev->input);
+ device_unregister(&dev->dev);
+}
+EXPORT_SYMBOL(rmi_function_unregister_device);
+
+static int __init rmi_function_init(void)
+{
+ pr_debug("%s: RMI Function Init\n", __func__);
+
+ return 0;
+}
+
+static void __exit rmi_function_exit(void)
+{
+ pr_debug("%s: RMI Function Exit\n", __func__);
+}
+
+module_init(rmi_function_init);
+module_exit(rmi_function_exit);
+
+MODULE_AUTHOR("Synaptics, Inc.");
+MODULE_DESCRIPTION("RMI4 Function Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/input/touchscreen/rmi_function.h b/drivers/input/touchscreen/rmi_function.h
new file mode 100644
index 0000000..029f935
--- /dev/null
+++ b/drivers/input/touchscreen/rmi_function.h
@@ -0,0 +1,175 @@
+/**
+ *
+ * Synaptics Register Mapped Interface (RMI4) Function Device Header File.
+ * Copyright (c) 2007 - 2011, Synaptics Incorporated
+ *
+ *
+ */
+/*
+ * This file is licensed under the GPL2 license.
+ *
+ *#############################################################################
+ * GPL
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License 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.
+ *
+ *#############################################################################
+ */
+
+#if !defined(_RMI_FUNCTION_H)
+#define _RMI_FUNCTION_H
+
+#include <linux/input.h>
+#include <linux/device.h>
+
+/* For each function present on the RMI device, there will be a corresponding
+ * entry in the functions list of the rmi_sensor_driver structure. This entry
+ * gives information about the number of data sources and the number of data
+ * registers associated with the function.
+ */
+struct rmi_function_info {
+ /* The sensor this function belongs to.
+ */
+ struct rmi_sensor_driver *sensor;
+
+ /* A device associated with this function.
+ */
+ struct rmi_function_device *function_device;
+
+ unsigned char function_number;
+
+ /* This is the number of data sources associated with the function. */
+ unsigned char num_data_sources;
+
+ /* This is the interrupt register and mask - needed for enabling the
+ * interrupts and for checking what source had caused the attention
+ * line interrupt.
+ */
+ unsigned char interrupt_register;
+ unsigned char interrupt_mask;
+
+ /* This is the RMI function descriptor associated with this function.
+ * It contains the Base addresses for the functions query, command,
+ * control, and data registers.
+ */
+ struct rmi_function_descriptor function_descriptor;
+
+ /* pointer to data specific to a functions implementation. */
+ void *fndata;
+
+ /* A list of the function information.
+ * This list uses the standard kernel linked list implementation.
+ * Documentation on on how to use it can be found at
+ * http://isis.poly.edu/kulesh/stuff/src/klist/.
+ */
+ struct list_head link;
+};
+
+/* This struct is for creating a list of RMI4 functions that have data sources
+associated with them. This is to facilitate adding new support for other
+data sources besides 2D sensors.
+To add a new data source support, the developer will create a new file
+and add these 4 functions below with FN$## in front of the names - where
+## is the hex number for the function taken from the RMI4 specification.
+
+The function number will be associated with this and later will be used to
+match the RMI4 function to the 4 functions for that RMI4 function number.
+The user will also have to add code that adds the new rmi_functions item
+to the global list of RMI4 functions and stores the pointers to the 4
+functions in the function pointers.
+ */
+struct rmi_function_ops {
+ unsigned char function_number;
+
+ /* Pointers to function specific functions for interruptHandler,
+ * config, init, detect and attention. These ptrs. need to be filled
+ * in for every RMI4 function that has data source(s) associated with
+ * it - like fn $11 (2D sensors), fn $19 (buttons), etc. Each RMI4
+ * function that has data sources will be added into a list that is
+ * used to match the function number against the number stored here.
+ *
+ * The sensor implementation will call this whenever and IRQ is
+ * dispatched that this function is interested in.
+ */
+ void (*inthandler) (struct rmi_function_info *rfi,
+ unsigned int asserted_IRQs);
+
+ int (*config) (struct rmi_function_info *rmifninfo);
+ int (*init) (struct rmi_function_device *function_device);
+ int (*detect) (struct rmi_function_info *rmifninfo);
+ /* If this is non-null, the sensor implementation will call this
+ * whenever the ATTN line is asserted.
+ */
+ void (*attention) (struct rmi_function_info *rmifninfo);
+ /**
+ * suspend/resume provided from each function
+ */
+ int (*suspend) (struct rmi_function_info *rmifninfo);
+ void (*resume) (struct rmi_function_info *rmifninfo);
+ /**
+ * suspendable
+ * return zero if the function cannot be suspended at the moment
+ * nonzero if the function can be suspended
+ */
+ int (*suspendable)(struct rmi_function_info *rmifninfo);
+};
+
+struct rmi_function_ops *rmi_find_function(int function_number);
+int rmi_functions_init(struct input_dev *inputdev);
+
+struct rmi_function_driver {
+ struct module *module;
+ struct device_driver drv;
+
+ /* Probe Function
+ * This function is called to give the function driver layer an
+ * opportunity to claim an RMI function.
+ */
+ int (*probe) (struct rmi_function_driver *function);
+ /* Config Function
+ * This function is called after a successful probe. It gives the
+ * function driver an opportunity to query and/or configure an RMI
+ * function before data starts flowing.
+ */
+ void (*config) (struct rmi_function_driver *function);
+
+ unsigned short query_base_address;
+ unsigned short control_base_address;
+ unsigned short command_base_address;
+ unsigned short data_base_address;
+ /* offset from start of interrupt registers */
+ unsigned int interrupt_register_offset;
+ unsigned int interrupt_mask;
+
+ /* Pointer to the corresponding phys driver info for this sensor.
+ * The phys driver has the pointers to read, write, etc. Probably
+ * don't need it here - used down in bus driver and sensor driver. */
+ struct rmi_phys_driver *rpd;
+
+ struct list_head function_drivers;
+};
+
+struct rmi_function_device {
+ struct rmi_function_driver *function;
+ struct device dev;
+ struct input_dev *input;
+ /* need this to be bound to phys driver layer */
+ struct rmi_sensor_driver *sensor;
+
+ /* The function ptrs to the config, init, detect and
+ * report functions for this rmi function device. */
+ struct rmi_function_ops *rmi_funcs;
+ struct rmi_function_info *rfi;
+ struct list_head functions; /* link functions into list */
+};
+
+int rmi_function_register_device(struct rmi_function_device *dev,
+ int function_number);
+#endif
diff --git a/drivers/input/touchscreen/rmi_sensor.c b/drivers/input/touchscreen/rmi_sensor.c
new file mode 100644
index 0000000..c40ba37
--- /dev/null
+++ b/drivers/input/touchscreen/rmi_sensor.c
@@ -0,0 +1,1059 @@
+/**
+ * Synaptics Register Mapped Interface (RMI4) - RMI Sensor Module.
+ * Copyright (C) 2007 - 2011, Synaptics Incorporated
+ *
+ */
+/*
+ * This file is licensed under the GPL2 license.
+ *
+ *#############################################################################
+ * GPL
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License 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/gpio.h>
+#include <linux/list.h>
+#include <linux/device.h>
+#include <linux/hrtimer.h>
+#include <linux/miscdevice.h>
+#include <linux/fs.h>
+#include <linux/delay.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+
+#include "rmi_drvr.h"
+#include "rmi_bus.h"
+#include "rmi_function.h"
+#include "rmi_sensor.h"
+
+/* Context data for each sensor.
+ */
+struct sensor_instance_data {
+ unsigned char pdt_props;
+ unsigned char bsr;
+};
+
+#define HAS_BSR_MASK 0x20
+#define HAS_NONSTANDARD_PDT_MASK 0x40
+
+static bool has_bsr(struct sensor_instance_data *instance_data)
+{
+ return (instance_data->pdt_props & HAS_BSR_MASK) != 0;
+}
+
+long polltime = 25000000; /* Shared with rmi_function.c. */
+EXPORT_SYMBOL(polltime);
+module_param(polltime, long, 0644);
+MODULE_PARM_DESC(polltime, "How long to wait between polls (in nano seconds).");
+
+#define PDT_START_SCAN_LOCATION 0x00E9
+#define PDT_END_SCAN_LOCATION 0x0005
+#define PDT_ENTRY_SIZE 0x0006
+#define PDT_PROPERTIES_LOCATION 0x00EF
+#define BSR_LOCATION 0x00FE
+
+static DEFINE_MUTEX(rfi_mutex);
+
+struct rmi_function_ops *rmi_find_function(int function_number);
+
+/* sysfs files for sensor attributes for BSR register value. */
+static ssize_t rmi_sensor_hasbsr_show(struct device *dev,
+ struct device_attribute *attr, char *buf);
+
+static ssize_t rmi_sensor_bsr_show(struct device *dev,
+ struct device_attribute *attr, char *buf);
+
+static ssize_t rmi_sensor_bsr_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count);
+
+static struct device_attribute attrs[] = {
+ __ATTR(hasbsr, 0444,
+ rmi_sensor_hasbsr_show, rmi_store_error), /* RO attr */
+ __ATTR(bsr, 0666,
+ rmi_sensor_bsr_show, rmi_sensor_bsr_store) /* RW attr */
+};
+
+#ifdef CONFIG_HAS_EARLYSUSPEND
+static void rmi_sensor_early_suspend(struct early_suspend *h);
+static void rmi_sensor_late_resume(struct early_suspend *h);
+#endif
+
+int rmi_read(struct rmi_sensor_driver *sensor, unsigned short address,
+ char *dest)
+{
+ struct rmi_phys_driver *rpd = sensor->rpd;
+ if (!rpd)
+ return -ENODEV;
+ return rpd->read(rpd, address, dest);
+}
+EXPORT_SYMBOL(rmi_read);
+
+int rmi_write(struct rmi_sensor_driver *sensor, unsigned short address,
+ unsigned char data)
+{
+ struct rmi_phys_driver *rpd = sensor->rpd;
+ if (!rpd)
+ return -ENODEV;
+ return rpd->write(rpd, address, data);
+}
+EXPORT_SYMBOL(rmi_write);
+
+int rmi_read_multiple(struct rmi_sensor_driver *sensor, unsigned short address,
+ char *dest, int length)
+{
+ struct rmi_phys_driver *rpd = sensor->rpd;
+ if (!rpd)
+ return -ENODEV;
+ return rpd->read_multiple(rpd, address, dest, length);
+}
+EXPORT_SYMBOL(rmi_read_multiple);
+
+int rmi_write_multiple(struct rmi_sensor_driver *sensor, unsigned short address,
+ unsigned char *data, int length)
+{
+ struct rmi_phys_driver *rpd = sensor->rpd;
+ if (!rpd)
+ return -ENODEV;
+ return rpd->write_multiple(rpd, address, data, length);
+}
+EXPORT_SYMBOL(rmi_write_multiple);
+
+/* Utility routine to set bits in a register. */
+int rmi_set_bits(struct rmi_sensor_driver *sensor, unsigned short address,
+ unsigned char bits)
+{
+ unsigned char reg_contents;
+ int retval;
+
+ retval = rmi_read(sensor, address, ®_contents);
+ if (retval)
+ return retval;
+ reg_contents = reg_contents | bits;
+ retval = rmi_write(sensor, address, reg_contents);
+ if (retval == 1)
+ return 0;
+ else if (retval == 0)
+ return -EINVAL; /* TODO: What should this be? */
+ return retval;
+}
+EXPORT_SYMBOL(rmi_set_bits);
+
+/* Utility routine to clear bits in a register. */
+int rmi_clear_bits(struct rmi_sensor_driver *sensor, unsigned short address,
+ unsigned char bits)
+{
+ unsigned char reg_contents;
+ int retval;
+
+ retval = rmi_read(sensor, address, ®_contents);
+ if (retval)
+ return retval;
+ reg_contents = reg_contents & ~bits;
+ retval = rmi_write(sensor, address, reg_contents);
+ if (retval == 1)
+ return 0;
+ else if (retval == 0)
+ return -EINVAL; /* TODO: What should this be? */
+ return retval;
+}
+EXPORT_SYMBOL(rmi_clear_bits);
+
+/* Utility routine to set the value of a bit field in a register. */
+int rmi_set_bit_field(struct rmi_sensor_driver *sensor, unsigned short address,
+ unsigned char field_mask, unsigned char bits)
+{
+ unsigned char reg_contents;
+ int retval;
+
+ retval = rmi_read(sensor, address, ®_contents);
+ if (retval)
+ return retval;
+ reg_contents = (reg_contents & ~field_mask) | bits;
+ retval = rmi_write(sensor, address, reg_contents);
+ if (retval == 1)
+ return 0;
+ else if (retval == 0)
+ return -EINVAL; /* TODO: What should this be? */
+ return retval;
+}
+EXPORT_SYMBOL(rmi_set_bit_field);
+
+bool rmi_polling_required(struct rmi_sensor_driver *sensor)
+{
+ return sensor->polling_required;
+}
+EXPORT_SYMBOL(rmi_polling_required);
+
+/* Keeps track of how many sensors we've seen so far. TODO: What happens
+ * if we disconnect from a sensor? Does it sensor number get recycled?
+ */
+static int sensor_count;
+
+/* Sensors are identified starting at 0 and working up. This will retrieve
+ * the current sensor number, and increment the sensor_count.
+ */
+int rmi_next_sensor_id()
+{
+ int id = sensor_count;
+ sensor_count++;
+ return id;
+}
+EXPORT_SYMBOL(rmi_next_sensor_id);
+
+/* Functions can call this in order to dispatch IRQs. */
+void dispatchIRQs(struct rmi_sensor_driver *sensor, unsigned int irq_status)
+{
+ struct rmi_function_info *function_info;
+
+ list_for_each_entry(function_info, &sensor->functions, link) {
+ if ((function_info->interrupt_mask & irq_status) &&
+ function_info->function_device->rmi_funcs->
+ inthandler) {
+ /* Call the function's interrupt handler. */
+ function_info->function_device->rmi_funcs->
+ inthandler(function_info,
+ (function_info->
+ interrupt_mask & irq_status));
+ }
+ }
+}
+
+/*
+ * This is the function we pass to the RMI4 subsystem so we can be notified
+ * when attention is required. It may be called in interrupt context.
+ */
+static void attention(struct rmi_phys_driver *physdrvr, int instance)
+{
+ /* All we have to do is schedule work. */
+ schedule_work(&(physdrvr->sensor->work));
+}
+
+/* This notifies any interested functions that there is an Attention interrupt.
+ * The interested functions should take appropriate actions (such as reading
+ * the interrupt status register and dispatching any appropriate RMI4
+ * interrupts).
+ */
+void attn_notify(struct rmi_sensor_driver *sensor)
+{
+ struct rmi_function_info *function_info;
+
+ list_for_each_entry(function_info, &sensor->functions, link) {
+ if (function_info->function_device
+ && function_info->function_device->rmi_funcs->attention) {
+ function_info->function_device->rmi_funcs->
+ attention(function_info);
+ }
+ }
+}
+
+/* This is the worker function - for now it simply has to call attn_notify.
+ * This work should be scheduled whenever an ATTN interrupt is asserted by
+ * the touch sensor. We then call attn_notify to dispatch notification of
+ * the ATTN interrupt to all interested functions. After all the attention
+ * handling functions have returned, it is presumed safe to re-enable the
+ * Attention interrupt.
+ */
+static void sensor_work_func(struct work_struct *work)
+{
+ struct rmi_sensor_driver *sensor =
+ container_of(work, struct rmi_sensor_driver, work);
+ struct rmi_sensor_device *sensor_dev = sensor->sensor_device;
+
+ mutex_lock(&sensor->work_lock);
+ attn_notify(sensor);
+
+ /* we only need to enable the irq if doing interrupts */
+ /*
+ * if suspend operation occurs and this is the function during execution
+ * we cannot enable irq again
+ */
+ if (!rmi_polling_required(sensor) && !sensor_dev->device_is_suspended)
+ enable_irq(sensor->rpd->irq);
+ mutex_unlock(&sensor->work_lock);
+}
+
+/* This is the timer function for polling - it simply has to schedule work
+ * and restart the timer. */
+static enum hrtimer_restart sensor_poll_timer_func(struct hrtimer *timer)
+{
+ struct rmi_sensor_driver *sensor =
+ container_of(timer, struct rmi_sensor_driver, timer);
+
+ if (!work_pending(&sensor->work))
+ schedule_work(&sensor->work);
+ hrtimer_start(&sensor->timer, ktime_set(0, polltime), HRTIMER_MODE_REL);
+ return HRTIMER_NORESTART;
+}
+
+/* This is the probe function passed to the RMI4 subsystem that gives us a
+ * chance to recognize an RMI4 device. In this case, we're looking for
+ * Synaptics devices that have data sources - such as touch screens, buttons,
+ * etc.
+ *
+ * TODO: Well, it used to do this. I'm not sure it's required any more.
+ */
+static int probe(struct rmi_sensor_driver *sensor)
+{
+ struct rmi_phys_driver *rpd = sensor->rpd;
+ pr_debug("%s: PROBE CALLED", __func__);
+
+ if (!rpd) {
+ pr_err("%s: Invalid rmi physical driver - null ptr: %p\n",
+ __func__, rpd);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void config(struct rmi_sensor_driver *sensor)
+{
+ /* For each data source we had detected print info and set up interrupts
+ or polling. */
+ struct rmi_function_info *function_info;
+ struct rmi_phys_driver *rpd = sensor->rpd;
+ struct sensor_instance_data *instance_data =
+ sensor->sensor_device->sensordata;
+ int attr_count = 0;
+
+ int retval;
+
+ dev_dbg(&sensor->sensor_device->dev, "%s: CONFIG CALLED", __func__);
+
+ list_for_each_entry(function_info, &sensor->functions, link) {
+ /* Get and print some info about the data sources... */
+ struct rmi_function_ops *fn;
+ /* check if function number matches - if so call that
+ config function */
+ fn = rmi_find_function(function_info->function_number);
+ if (fn) {
+ if (fn->config) {
+ fn->config(function_info);
+ } else {
+ dev_warn(&sensor->sensor_device->dev,
+ "%s: no config function for "
+ "function 0x%02x.\n", __func__,
+ function_info->function_number);
+ }
+ } else {
+ /* if no support found for this RMI4 function
+ it means the developer did not add the
+ appropriate function pointer list into the
+ rmi4_supported_data_src_functions array and/or
+ did not bump up the number of supported RMI4
+ functions in rmi.h as required */
+ dev_err(&sensor->sensor_device->dev,
+ "%s: no support found for function 0x%02x.\n",
+ __func__, function_info->function_number);
+ }
+ }
+
+ retval = rpd->read(rpd, PDT_PROPERTIES_LOCATION,
+ (char *) &instance_data->pdt_props);
+ if (retval) {
+ dev_warn(&sensor->sensor_device->dev,
+ "%s: Could not read PDT propertys from 0x%04x. "
+ "Assuming 0x00.\n",
+ __func__, PDT_PROPERTIES_LOCATION);
+ }
+
+
+ dev_dbg(&sensor->sensor_device->dev, "%s: Creating sysfs files.",
+ __func__);
+ /* Set up sysfs device attributes. */
+ for (attr_count = 0; attr_count < ARRAY_SIZE(attrs); attr_count++) {
+ if (device_create_file(&sensor->sensor_device->dev,
+ &attrs[attr_count]) < 0) {
+ dev_err(&sensor->sensor_device->dev,
+ "%s: Failed to create sysfs file for %s.\n",
+ __func__, attrs[attr_count].attr.name);
+ goto error_exit;
+ }
+ }
+
+ if (rmi_polling_required(sensor)) {
+ /* We're polling driven, so set up the polling timer
+ and timer function. */
+ hrtimer_init(&sensor->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ sensor->timer.function = sensor_poll_timer_func;
+ hrtimer_start(&sensor->timer, ktime_set(1, 0),
+ HRTIMER_MODE_REL);
+ }
+
+error_exit:
+ for (attr_count--; attr_count >= 0; attr_count--)
+ device_remove_file(&sensor->sensor_device->dev,
+ &attrs[attr_count]);
+ /* If you alloc anything, free it here. */
+}
+void *rmi_sensor_get_functiondata(struct rmi_sensor_driver *driver,
+ unsigned char function_index)
+{
+ int i;
+
+ if (!driver->perfunctiondata)
+ return NULL;
+
+ for (i = 0; i < driver->perfunctiondata->count; i++) {
+ if (driver->perfunctiondata->functiondata[i].function_index ==
+ function_index)
+ return driver->perfunctiondata->functiondata[i].data;
+ }
+
+ return NULL;
+}
+
+/*
+ * final implementation of suspend/early_suspend function
+ */
+static int rmi_sensor_suspend(struct device *dev, pm_message_t state)
+{
+ struct rmi_sensor_device *sensor_device =
+ container_of(dev, struct rmi_sensor_device, dev);
+ struct rmi_phys_driver *phys_drvr = sensor_device->driver->rpd;
+ struct rmi_sensor_driver *sensor_drvr = sensor_device->driver;
+ struct rmi_sensor_suspend_custom_ops *custom_ops =
+ sensor_drvr->custom_suspend_ops;
+ int retval;
+ struct rmi_function_info *function_info;
+ bool canSuspend = true;
+
+ mutex_lock(&sensor_drvr->sensor_device->setup_suspend_flag);
+
+ if (sensor_device->device_is_suspended) {
+ mutex_unlock(&sensor_drvr->sensor_device->setup_suspend_flag);
+ return 0;
+ }
+
+ /* iterates all of the functions to make sure that we
+ * can enter suspend mode. */
+ list_for_each_entry(function_info, &sensor_drvr->functions, link) {
+ if (function_info->function_device
+ && function_info->function_device->
+ rmi_funcs->suspendable) {
+
+ if (!(function_info->function_device->rmi_funcs->
+ suspendable(function_info))) {
+ canSuspend = false;
+ dev_err(dev, "%s: suspend fails, F0x%02X is "
+ "not suspendable", __func__,
+ function_info->function_number);
+ break;
+ }
+
+ }
+ }
+
+ if (!canSuspend) {
+ mutex_unlock(&sensor_drvr->sensor_device->setup_suspend_flag);
+ return -1;
+ }
+
+ /* set flag before disabling irq */
+ sensor_device->device_is_suspended = 1;
+
+ if (rmi_polling_required(sensor_drvr)) {
+ hrtimer_cancel(&(sensor_drvr->timer));
+ } else {
+ if (phys_drvr)
+ disable_irq(phys_drvr->irq);
+ }
+ retval = cancel_work_sync(&sensor_drvr->work);
+ if (retval && !(rmi_polling_required(sensor_drvr))) {
+ /* if work is pending ,suspend fail */
+ if (phys_drvr)
+ enable_irq(phys_drvr->irq);
+ /* reset suspend flag */
+ sensor_device->device_is_suspended = 0;
+ dev_err(dev, "%s: suspend fails, work pending", __func__);
+ retval = -1;
+ goto exit;
+ }
+
+ /* invoke the suspend handler of each functions of this sensor */
+ /* ex. we will call suspend of F01 in the loop*/
+ list_for_each_entry(function_info, &sensor_drvr->functions, link) {
+ if (function_info->function_device
+ && function_info->function_device->rmi_funcs->suspend) {
+
+ retval = function_info->function_device->rmi_funcs->
+ suspend(function_info);
+ if (retval) {
+ /* reset suspend flag */
+ sensor_device->device_is_suspended = 0;
+
+ if (rmi_polling_required(sensor_drvr)) {
+ /* restart polling timer*/
+ hrtimer_start(&(sensor_drvr->timer),
+ ktime_set(1, 0),
+ HRTIMER_MODE_REL);
+ } else {
+ if (phys_drvr) {
+ /* re-enalbe irq*/
+ enable_irq(phys_drvr->irq);
+ }
+ }
+ dev_err(dev, "%s: failed to suspend F0x%02x.",
+ __func__,
+ function_info->function_number);
+ retval = -1;
+ goto exit;
+ }
+ }
+ }
+
+ /* apply customized settings */
+ if (custom_ops->rmi_sensor_custom_suspend)
+ custom_ops->rmi_sensor_custom_suspend();
+
+exit:
+ mutex_unlock(&sensor_drvr->sensor_device->setup_suspend_flag);
+ return retval;
+}
+
+/*
+ * final implementation of resume/late_resume function
+ */
+static int rmi_sensor_resume(struct device *dev)
+{
+ struct rmi_sensor_device *sensor_device =
+ container_of(dev, struct rmi_sensor_device, dev);
+ struct rmi_phys_driver *phys_drvr = sensor_device->driver->rpd;
+ struct rmi_sensor_driver *sensor_drvr = sensor_device->driver;
+ struct rmi_sensor_suspend_custom_ops *custom_ops =
+ sensor_drvr->custom_suspend_ops;
+ struct rmi_function_info *function_info;
+
+ mutex_lock(&sensor_drvr->sensor_device->setup_suspend_flag);
+ if (sensor_device->device_is_suspended) {
+ /* reset suspend flag reenable irq */
+ sensor_device->device_is_suspended = 0;
+ /* apply customized settings */
+ if (custom_ops->rmi_sensor_custom_resume)
+ custom_ops->rmi_sensor_custom_resume();
+
+ /* invoke the resume handler of each functions of this sensor */
+ /* ex. we will call resume of F01 in the loop*/
+ list_for_each_entry(function_info,
+ &sensor_drvr->functions, link) {
+ if (function_info->function_device
+ && function_info->function_device->
+ rmi_funcs->resume)
+ function_info->function_device->rmi_funcs->
+ resume(function_info);
+ }
+
+ /* apply delay after setup hardware */
+ if (custom_ops->delay_resume)
+ mdelay(custom_ops->delay_resume);
+
+ if (rmi_polling_required(sensor_drvr)) {
+ hrtimer_start(&(sensor_drvr->timer), ktime_set(1, 0),
+ HRTIMER_MODE_REL);
+ } else {
+ if (phys_drvr)
+ enable_irq(phys_drvr->irq);
+ }
+ }
+ mutex_unlock(&sensor_drvr->sensor_device->setup_suspend_flag);
+ return 0;
+}
+
+#ifdef CONFIG_HAS_EARLYSUSPEND
+/*
+ * Handler for early suspend
+ */
+static void rmi_sensor_early_suspend(struct early_suspend *h)
+{
+ struct rmi_sensor_device *sensor_device =
+ container_of(h, struct rmi_sensor_device, early_suspend_handler);
+ pm_message_t state;
+ state.event = PM_EVENT_SUSPEND;
+ (void)rmi_sensor_suspend(&(sensor_device->dev), state);
+}
+
+/*
+ * Handler for late resume
+ */
+static void rmi_sensor_late_resume(struct early_suspend *h)
+{
+ struct rmi_sensor_device *sensor_device =
+ container_of(h, struct rmi_sensor_device, early_suspend_handler);
+ (void)rmi_sensor_resume(&(sensor_device->dev));
+}
+#endif
+/*
+ * This method is called, whenever a new sensor device is added for the rmi
+ * bus.
+ *
+ * It will scan the devices PDT to determine the supported functions
+ * and create a new function device for each of these. It will read
+ * the query, control, command and data regsiters for the function
+ * to be used for each newly created function device.
+ *
+ * The sensor device is then bound to every function it supports.
+ *
+ */
+static int rmi_sensor_register_functions(struct rmi_sensor_driver *sensor)
+{
+ struct rmi_function_device *function;
+ unsigned int interrupt_register_count = 0;
+ struct rmi_phys_driver *rpd = sensor->rpd;
+ int i;
+ int j;
+ int interrupt_offset;
+ unsigned char interrupt_count = 0;
+ struct rmi_function_descriptor rmi_fd;
+ struct rmi_function_ops *fn;
+ int retval = 0;
+ struct device *dev = &sensor->sensor_device->dev;
+ struct rmi_function_info *function_info = NULL;
+
+ /* Read the Page Descriptor Table to determine what functions
+ * are present */
+ dev_dbg(dev, "%s: Scanning page descriptors.", __func__);
+ for (i = PDT_START_SCAN_LOCATION;
+ i >= PDT_END_SCAN_LOCATION; i -= PDT_ENTRY_SIZE) {
+
+ dev_dbg(dev, "%s: Reading page descriptor 0x%02x", __func__, i);
+ retval = rpd->read_multiple(rpd, i, (char *)&rmi_fd,
+ sizeof(rmi_fd));
+ if (retval) {
+ /* failed to read next PDT entry - end PDT
+ scan - this may result in an incomplete set
+ of recognized functions - we could return
+ an error here but the driver may still be
+ viable for diagnostics and debugging so let's
+ let it continue. */
+ dev_err(dev,
+ "%s: Read error %d at PDT entry 0x%02x, "
+ "ending scan.\n", __func__, retval, i);
+ break;
+ }
+
+ if (!RMI_IS_VALID_FUNCTION_ID(rmi_fd.function_number)) {
+ /* A zero or 0xff in the function number
+ signals the end of the PDT */
+ dev_dbg(dev, "%s: Found end of PDT\n", __func__);
+ break;
+ }
+
+ dev_dbg(dev,
+ "%s: F%02x - queries %02x commands %02x control %02x "
+ "data %02x ints %02x",
+ __func__,
+ rmi_fd.function_number, rmi_fd.query_base_addr,
+ rmi_fd.command_base_addr, rmi_fd.control_base_addr,
+ rmi_fd.data_base_addr, rmi_fd.interrupt_source_count);
+
+ /* determine if the function is supported and if so
+ * then bind this function device to the sensor */
+ function_info = kzalloc(sizeof(*function_info), GFP_KERNEL);
+ if (!function_info) {
+ dev_err(dev,
+ "%s: out of memory for function F%02x.",
+ __func__, rmi_fd.function_number);
+ retval = -ENOMEM;
+ goto exit_fail;
+ }
+ function_info->sensor = sensor;
+ function_info->function_number = rmi_fd.function_number & 0xff;
+ memcpy(&function_info->function_descriptor, &rmi_fd,
+ sizeof(rmi_fd));
+ function_info->num_data_sources =
+ rmi_fd.interrupt_source_count;
+ function_info->interrupt_register = interrupt_count / 8;
+ /* loop through interrupts for each source and or in a bit
+ * to the interrupt mask for each. */
+ interrupt_offset = interrupt_count % 8;
+
+ for (j = interrupt_offset;
+ j < ((rmi_fd.interrupt_source_count & 0x7)
+ + interrupt_offset);
+ j++) {
+ function_info->interrupt_mask |= 1 << j;
+ }
+ INIT_LIST_HEAD(&function_info->link);
+
+ /* Get the ptr to the detect function based on
+ * the function number */
+ dev_dbg(dev, "%s: Checking for RMI function F%02x.", __func__,
+ rmi_fd.function_number);
+ fn = rmi_find_function(rmi_fd.function_number);
+ if (!fn) {
+ dev_err(dev,
+ "%s: couldn't find support for F%02X.",
+ __func__, rmi_fd.function_number);
+ } else {
+ retval = fn->detect(function_info);
+ if (retval)
+ dev_err(dev,
+ "%s: Function detect for F%02x failed "
+ "with %d.",
+ __func__, rmi_fd.function_number, retval);
+
+ /* Create a function device and function driver. */
+ function = kzalloc(sizeof(*function), GFP_KERNEL);
+ if (!function) {
+ dev_err(dev,
+ "%s: Error allocating memory for "
+ "rmi_function_device.",
+ __func__);
+ retval = -ENOMEM;
+ goto exit_fail;
+ }
+
+ function->dev.parent = &sensor->sensor_device->dev;
+ function->dev.bus = sensor->sensor_device->dev.bus;
+ function->rmi_funcs = fn;
+ function->sensor = sensor;
+ function->rfi = function_info;
+ function_info->function_device = function;
+
+ /* Check if we have an interrupt mask of 0 and a
+ * non-NULL interrupt handler function and print a
+ * debug message since we should never have this.
+ */
+ if (function_info->interrupt_mask == 0
+ && fn->inthandler != NULL) {
+ dev_warn(dev,
+ "%s: Can't have a zero interrupt mask "
+ "for function F%02x (which requires an "
+ "interrupt handler).",
+ __func__, rmi_fd.function_number);
+ }
+
+ /* Check if we have a non-zero interrupt mask and
+ * a NULL interrupt handler function and print a debug
+ * message since we should never have this.
+ */
+ if (function_info->interrupt_mask != 0
+ && fn->inthandler == NULL) {
+ dev_warn(dev,
+ "%s: Can't have a non-zero interrupt "
+ "mask %d for function F%02x with a NULL "
+ "inthandler fn.\n",
+ __func__, function_info->interrupt_mask,
+ rmi_fd.function_number);
+ }
+
+ /* Register the rmi function device */
+ retval = rmi_function_register_device(function,
+ rmi_fd.function_number);
+ if (retval) {
+ dev_err(dev,
+ "%s: Failed rmi_function_register_device.",
+ __func__);
+ goto exit_fail;
+ }
+ }
+
+ /* bump interrupt count for next iteration. NOTE: The value 7
+ * is reserved - for now, only bump up one for an interrupt
+ * count of 7. */
+ if ((rmi_fd.interrupt_source_count & 0x7) == 0x7) {
+ interrupt_count += 1;
+ } else {
+ interrupt_count +=
+ (rmi_fd.interrupt_source_count & 0x7);
+ }
+
+ /* link this function info to the RMI module infos list
+ * of functions. */
+ if (function_info == NULL) {
+ dev_dbg(dev, "%s: WTF? function_info is null here.",
+ __func__);
+ } else {
+ dev_dbg(dev, "%s: Adding F%02x with %d sources.",
+ __func__, function_info->function_number,
+ function_info->num_data_sources);
+
+ mutex_lock(&rfi_mutex);
+ list_add_tail(&function_info->link, &sensor->functions);
+ mutex_unlock(&rfi_mutex);
+ }
+ function_info = NULL;
+ }
+
+ dev_dbg(dev, "%s: Done scanning.", __func__);
+
+ /* calculate the interrupt register count - used in the
+ * ISR to read the correct number of interrupt registers */
+ interrupt_register_count = (interrupt_count + 7) / 8;
+ /* TODO: Is interrupt_register_count needed by the sensor anymore? */
+ sensor->interrupt_register_count = interrupt_register_count;
+
+ return 0;
+
+exit_fail:
+ kfree(function_info);
+ return retval;
+}
+
+/* sysfs show and store fns for sensor dev */
+static ssize_t rmi_sensor_hasbsr_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct rmi_sensor_device *sensor = dev_get_drvdata(dev);
+ struct sensor_instance_data *instance_data =
+ (struct sensor_instance_data *)sensor->sensordata;
+
+ return snprintf(buf, PAGE_SIZE, "%u\n", has_bsr(instance_data));
+}
+
+static ssize_t rmi_sensor_bsr_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct rmi_sensor_device *sensor = dev_get_drvdata(dev);
+ struct sensor_instance_data *instance_data =
+ (struct sensor_instance_data *)sensor->sensordata;
+
+ return snprintf(buf, PAGE_SIZE, "%u\n", instance_data->bsr);
+}
+
+static ssize_t rmi_sensor_bsr_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int retval;
+ struct rmi_sensor_device *sensor = dev_get_drvdata(dev);
+ struct sensor_instance_data *instance_data =
+ (struct sensor_instance_data *)sensor->sensordata;
+ unsigned long val;
+
+ /* need to convert the string data to an actual value */
+ strict_strtoul(buf, 10, &val);
+
+ retval = rmi_write(sensor->driver, BSR_LOCATION, (unsigned char)val);
+ if (retval) {
+ dev_err(dev, "%s : failed to write bsr %u to 0x%x\n",
+ __func__, (unsigned int)val, BSR_LOCATION);
+ return -EIO;
+ }
+
+ instance_data->bsr = val;
+
+ return count;
+}
+
+/* Call this to instantiate a new sensor driver.
+ */
+struct rmi_sensor_driver *rmi_sensor_create_driver(
+ struct rmi_sensor_device *sensor_device,
+ struct rmi_phys_driver *physical_driver,
+ struct rmi_sensordata *sensor_data)
+{
+ struct rmi_sensor_driver *driver =
+ kzalloc(sizeof(struct rmi_sensor_driver), GFP_KERNEL);
+ if (!driver) {
+ dev_err(&sensor_device->dev,
+ "%s: Out of memory for rmi_sensor_driver\n",
+ __func__);
+ goto error_exit;
+ }
+ driver->sensor_device = sensor_device;
+ driver->polling_required = physical_driver->polling_required;
+ driver->rpd = physical_driver;
+
+ mutex_init(&driver->work_lock);
+
+ if (sensor_data) {
+ driver->perfunctiondata = sensor_data->perfunctiondata;
+ /* pass reference to customized operations for suspend/resume */
+ driver->custom_suspend_ops = sensor_data->custom_suspend_ops;
+ }
+ INIT_LIST_HEAD(&driver->functions);
+
+ /* This will handle interrupts on the ATTN line (interrupt driven)
+ * or will be called every poll interval (when we're not interrupt
+ * driven).
+ */
+ INIT_WORK(&driver->work, sensor_work_func);
+
+ return driver;
+
+error_exit:
+ rmi_sensor_destroy_driver(driver);
+ return NULL;
+}
+
+/* Call this when you're done with the sensor driver. This will clean up any
+ * pending actions, cancel any running threads or works, and release all
+ * storage.
+ */
+void rmi_sensor_destroy_driver(struct rmi_sensor_driver *driver)
+{
+ kfree(driver);
+}
+
+int rmi_sensor_register_device(struct rmi_sensor_device *dev, int index)
+{
+ int status;
+#ifdef CONFIG_HAS_EARLYSUSPEND
+ struct early_suspend *early_suspend_handler;
+#endif
+
+ pr_debug("%s: Registering sensor device.\n", __func__);
+
+ /* make name - sensor00, sensor01, etc. */
+ dev_set_name(&dev->dev, "sensor%02d", index);
+
+ dev->sensordata =
+ kzalloc(sizeof(struct sensor_instance_data), GFP_KERNEL);
+ if (!dev->sensordata) {
+ dev_err(&dev->dev,
+ "%s: Out of memory for sensor instance data.\n", __func__);
+ return -ENOMEM;
+ }
+
+ status = device_register(&dev->dev);
+
+ if (status < 0) {
+ dev_err(&dev->dev, "%s: device register failed with %d.",
+ __func__, status);
+ goto error_exit;
+ }
+
+ mutex_init(&dev->setup_suspend_flag);
+
+#ifdef CONFIG_HAS_EARLYSUSPEND
+ /* register early_suspend handler after device is registered
+ */
+ early_suspend_handler = &(dev->early_suspend_handler);
+ early_suspend_handler->level =
+ EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1;
+ early_suspend_handler->suspend = rmi_sensor_early_suspend;
+ early_suspend_handler->resume = rmi_sensor_late_resume;
+ register_early_suspend(early_suspend_handler);
+#endif /* CONFIG_HAS_EARLYSUSPEND */
+
+error_exit:
+ kfree(dev->sensordata);
+ return status;
+}
+EXPORT_SYMBOL(rmi_sensor_register_device);
+
+static void rmi_sensor_unregister_device(struct rmi_sensor_device *rmisensordev)
+{
+#ifdef CONFIG_HAS_EARLYSUSPEND
+ struct early_suspend *early_suspend_handler;
+
+ /* unregister early_suspend handler before driver is unregistered
+ */
+ early_suspend_handler =
+ &(rmisensordev->early_suspend_handler);
+ unregister_early_suspend(early_suspend_handler);
+#endif /* CONFIG_HAS_EARLYSUSPEND */
+ dev_dbg(&rmisensordev->dev,
+ "%s: Unregistering sensor device.\n", __func__);
+
+ device_unregister(&rmisensordev->dev);
+}
+EXPORT_SYMBOL(rmi_sensor_unregister_device);
+
+#define DRIVER_NAME_CHARS 16
+
+int rmi_sensor_register_driver(struct rmi_sensor_driver *driver)
+{
+ static int index;
+ int ret;
+ char *drvrname;
+
+ pr_info("%s: Registering sensor driver.\n", __func__);
+ driver->dispatchIRQs = dispatchIRQs;
+ driver->attention = attention;
+ driver->config = config;
+ driver->probe = probe;
+
+ driver->drv.suspend = rmi_sensor_suspend;
+ driver->drv.resume = rmi_sensor_resume;
+ /* Create a function device and function driver for this Fn */
+ drvrname = kzalloc(DRIVER_NAME_CHARS, GFP_KERNEL);
+ if (!drvrname) {
+ pr_err
+ ("%s: Error allocating memory for rmi_sensor_driver name.",
+ __func__);
+ return -ENOMEM;
+ }
+ snprintf(drvrname, DRIVER_NAME_CHARS, "sensor%02d", index++);
+
+ driver->drv.name = drvrname;
+ driver->module = driver->drv.owner;
+
+ /* Register the sensor driver on the bus. */
+ ret = rmi_bus_register_sensor_driver(driver);
+ if (ret) {
+ pr_err("%s: Failed to register driver on bus, error = %d",
+ __func__, ret);
+ goto exit_fail;
+ }
+
+ /* register the functions on the sensor */
+ ret = rmi_sensor_register_functions(driver);
+ if (ret) {
+ pr_err("%s: Failed rmi_sensor_register_functions %d",
+ __func__, ret);
+ goto exit_fail;
+ }
+
+ /* configure the sensor - enable interrupts for each function,
+ * init work, set polling timer or adjust report rate, etc. */
+ config(driver);
+
+ pr_debug("%s: sensor driver registration completed.", __func__);
+
+exit_fail:
+ kfree(drvrname);
+ return ret;
+}
+EXPORT_SYMBOL(rmi_sensor_register_driver);
+
+static void rmi_sensor_unregister_driver(struct rmi_sensor_driver *driver)
+{
+ pr_debug("%s: Unregistering sensor driver.\n", __func__);
+
+ /* Stop the polling timer if doing polling */
+ if (rmi_polling_required(driver))
+ hrtimer_cancel(&driver->timer);
+
+ flush_scheduled_work(); /* Make sure all scheduled work is stopped */
+
+ rmi_bus_register_sensor_driver(driver);
+}
+EXPORT_SYMBOL(rmi_sensor_unregister_driver);
+
+static int __init rmi_sensor_init(void)
+{
+ pr_debug("%s: RMI Sensor Init\n", __func__);
+ return 0;
+}
+
+static void __exit rmi_sensor_exit(void)
+{
+ pr_debug("%s: RMI Sensor Driver Exit\n", __func__);
+ flush_scheduled_work(); /* Make sure all scheduled work is stopped */
+}
+
+module_init(rmi_sensor_init);
+module_exit(rmi_sensor_exit);
+
+MODULE_AUTHOR("Synaptics, Inc.");
+MODULE_DESCRIPTION("RMI4 Sensor Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/input/touchscreen/rmi_sensor.h b/drivers/input/touchscreen/rmi_sensor.h
new file mode 100644
index 0000000..9adc698
--- /dev/null
+++ b/drivers/input/touchscreen/rmi_sensor.h
@@ -0,0 +1,128 @@
+/**
+ *
+ * Synaptics Register Mapped Interface (RMI4) - RMI Sensor Module Header.
+ * Copyright (C) 2007 - 2011, Synaptics Incorporated
+ *
+ */
+/*
+ *
+ * This file is licensed under the GPL2 license.
+ *
+ *#############################################################################
+ * GPL
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License 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.
+ *
+ *#############################################################################
+ */
+
+#if !defined(_RMI_SENSOR_H)
+#define _RMI_SENSOR_H
+
+
+#include <linux/device.h>
+#include <linux/mutex.h>
+#ifdef CONFIG_HAS_EARLYSUSPEND
+#include <linux/earlysuspend.h>
+#endif
+
+#include "rmi_platformdata.h"
+
+struct rmi_sensor_driver {
+ struct module *module;
+ struct device_driver drv;
+ struct rmi_sensor_device *sensor_device;
+
+ /* Attention Function
+ * This function is called by the low level isr in the physical
+ * driver. It merely schedules work to be done.
+ */
+ void (*attention) (struct rmi_phys_driver *physdrvr, int instance);
+ /* Probe Function
+ * This function is called to give the sensor driver layer an
+ * opportunity to claim an RMI device. The sensor layer cannot
+ * read RMI registers at this point since the rmi physical driver
+ * has not been bound to it yet. Defer that to the config
+ * function call which occurs immediately after a successful probe.
+ */
+ int (*probe) (struct rmi_sensor_driver *sensor);
+ /* Config Function
+ * This function is called after a successful probe. It gives the
+ * sensor driver an opportunity to query and/or configure an RMI
+ * device before data starts flowing.
+ */
+ void (*config) (struct rmi_sensor_driver *sensor);
+
+ /* Functions can call this in order to dispatch IRQs. */
+ void (*dispatchIRQs) (struct rmi_sensor_driver *sensor,
+ unsigned int irq_status);
+
+ unsigned int interrupt_register_count;
+
+ bool polling_required;
+
+ /* pointer to the corresponding phys driver info for this sensor */
+ /* The phys driver has the pointers to read, write, etc. */
+ struct rmi_phys_driver *rpd;
+
+ struct hrtimer timer;
+ struct work_struct work;
+ struct mutex work_lock;
+
+ struct list_head functions; /* List of rmi_function_infos */
+ /* Per function initialization data. */
+ struct rmi_functiondata_list *perfunctiondata;
+ /* non-default operation for suspend/resume */
+ struct rmi_sensor_suspend_custom_ops *custom_suspend_ops;
+};
+
+/* macro to get the pointer to the device_driver struct from the sensor */
+#define to_rmi_sensor_driver(drv) \
+ container_of(drv, struct rmi_sensor_driver, drv);
+
+struct rmi_sensor_device {
+ struct rmi_sensor_driver *driver;
+ struct device dev;
+
+ /* mutex for setting device_is_supended flag*/
+ struct mutex setup_suspend_flag;
+ int device_is_suspended; /*it will be initialized to false(0) */
+#ifdef CONFIG_HAS_EARLYSUSPEND
+ /* handler to handle early_suspend and late_resume */
+ struct early_suspend early_suspend_handler;
+#endif
+ /* pointer to data specific to a sensor implementation. */
+ void *sensordata;
+
+ struct list_head sensors; /* link sensors into list */
+};
+
+int rmi_sensor_register_device(struct rmi_sensor_device *dev, int index);
+int rmi_sensor_register_driver(struct rmi_sensor_driver *driver);
+bool rmi_polling_required(struct rmi_sensor_driver *sensor);
+int rmi_next_sensor_id(void);
+
+void *rmi_sensor_get_functiondata(struct rmi_sensor_driver *driver,
+ unsigned char function_index);
+
+
+/* Call this to instantiate a new sensor driver.
+ */
+struct rmi_sensor_driver *rmi_sensor_create_driver(
+ struct rmi_sensor_device *sensor_device,
+ struct rmi_phys_driver *physical_driver,
+ struct rmi_sensordata *sensor_data);
+
+/* Call this when you're done with the sensor driver. This will clean up any
+ * pending actions, cancel any running threads or works, and release all
+ * storage.
+ */
+void rmi_sensor_destroy_driver(struct rmi_sensor_driver *driver);
+#endif
--
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