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    Subject[RFC PATCH 2/11] input: RMI4 core bus and sensor drivers.
    Date
    Signed-off-by: Christopher Heiny <cheiny@synaptics.com>

    Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
    Cc: Linus Walleij <linus.walleij@stericsson.com>
    Cc: Naveen Kumar Gaddipati <naveen.gaddipati@stericsson.com>
    Cc: Joeri de Gram <j.de.gram@gmail.com>

    ---

    drivers/input/rmi4/rmi_bus.c | 436 ++++++++++++
    drivers/input/rmi4/rmi_driver.c | 1488 +++++++++++++++++++++++++++++++++++++++
    drivers/input/rmi4/rmi_driver.h | 97 +++
    3 files changed, 2021 insertions(+), 0 deletions(-)

    diff --git a/drivers/input/rmi4/rmi_bus.c b/drivers/input/rmi4/rmi_bus.c
    new file mode 100644
    index 0000000..e32d4ad
    --- /dev/null
    +++ b/drivers/input/rmi4/rmi_bus.c
    @@ -0,0 +1,436 @@
    +/*
    + * Copyright (c) 2011 Synaptics Incorporated
    + * Copyright (c) 2011 Unixphere
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + *
    + * 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.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program; if not, write to the Free Software
    + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    + */
    +#include <linux/kernel.h>
    +#include <linux/device.h>
    +#include <linux/pm.h>
    +#include <linux/slab.h>
    +#include <linux/list.h>
    +#include <linux/rmi.h>
    +
    +DEFINE_MUTEX(rmi_bus_mutex);
    +
    +static struct rmi_function_list {
    + struct list_head list;
    + struct rmi_function_handler *fh;
    +} rmi_supported_functions;
    +
    +static struct rmi_character_driver_list {
    + struct list_head list;
    + struct rmi_char_driver *cd;
    +} rmi_character_drivers;
    +
    +static int physical_device_count;
    +
    +static int rmi_bus_match(struct device *dev, struct device_driver *driver)
    +{
    + struct rmi_driver *rmi_driver;
    + struct rmi_device *rmi_dev;
    + struct rmi_device_platform_data *pdata;
    +
    + rmi_driver = to_rmi_driver(driver);
    + rmi_dev = to_rmi_device(dev);
    + pdata = to_rmi_platform_data(rmi_dev);
    + dev_dbg(dev, "Matching %s.\n", pdata->sensor_name);
    +
    + if (!strcmp(pdata->driver_name, rmi_driver->driver.name)) {
    + rmi_dev->driver = rmi_driver;
    + dev_dbg(dev, "%s: Match %s to %s succeeded.\n", __func__,
    + pdata->driver_name, rmi_driver->driver.name);
    + return 1;
    + }
    +
    + dev_err(dev, "%s: Match %s to %s failed.\n", __func__,
    + pdata->driver_name, rmi_driver->driver.name);
    + return 0;
    +}
    +
    +#ifdef CONFIG_PM
    +static int rmi_bus_suspend(struct device *dev)
    +{
    +#ifdef GENERIC_SUBSYS_PM_OPS
    + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
    +
    + if (pm && pm->suspend)
    + return pm->suspend(dev);
    +#endif
    +
    + return 0;
    +}
    +
    +static int rmi_bus_resume(struct device *dev)
    +{
    +#ifdef GENERIC_SUBSYS_PM_OPS
    + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
    +
    + if (pm && pm->resume)
    + return pm->resume(dev);
    +#endif
    +
    + return 0;
    +}
    +#endif
    +
    +static int rmi_bus_probe(struct device *dev)
    +{
    + struct rmi_driver *driver;
    + struct rmi_device *rmi_dev = to_rmi_device(dev);
    +
    + driver = rmi_dev->driver;
    + if (driver && driver->probe)
    + return driver->probe(rmi_dev);
    +
    + return 0;
    +}
    +
    +static int rmi_bus_remove(struct device *dev)
    +{
    + struct rmi_driver *driver;
    + struct rmi_device *rmi_dev = to_rmi_device(dev);
    +
    + driver = rmi_dev->driver;
    + if (driver && driver->remove)
    + return driver->remove(rmi_dev);
    +
    + return 0;
    +}
    +
    +static void rmi_bus_shutdown(struct device *dev)
    +{
    + struct rmi_driver *driver;
    + struct rmi_device *rmi_dev = to_rmi_device(dev);
    +
    + driver = rmi_dev->driver;
    + if (driver && driver->shutdown)
    + driver->shutdown(rmi_dev);
    +}
    +
    +static SIMPLE_DEV_PM_OPS(rmi_bus_pm_ops,
    + rmi_bus_suspend, rmi_bus_resume);
    +
    +struct bus_type rmi_bus_type = {
    + .name = "rmi",
    + .match = rmi_bus_match,
    + .probe = rmi_bus_probe,
    + .remove = rmi_bus_remove,
    + .shutdown = rmi_bus_shutdown,
    + .pm = &rmi_bus_pm_ops
    +};
    +
    +int rmi_register_phys_device(struct rmi_phys_device *phys)
    +{
    + struct rmi_device_platform_data *pdata = phys->dev->platform_data;
    + struct rmi_device *rmi_dev;
    +
    + if (!pdata) {
    + dev_err(phys->dev, "no platform data!\n");
    + return -EINVAL;
    + }
    +
    + rmi_dev = kzalloc(sizeof(struct rmi_device), GFP_KERNEL);
    + if (!rmi_dev)
    + return -ENOMEM;
    +
    + rmi_dev->phys = phys;
    + rmi_dev->dev.bus = &rmi_bus_type;
    +
    + mutex_lock(&rmi_bus_mutex);
    + rmi_dev->number = physical_device_count;
    + physical_device_count++;
    + mutex_unlock(&rmi_bus_mutex);
    +
    + dev_set_name(&rmi_dev->dev, "sensor%02d", rmi_dev->number);
    + pr_debug("%s: Registered %s as %s.\n", __func__, pdata->sensor_name,
    + dev_name(&rmi_dev->dev));
    +
    + phys->rmi_dev = rmi_dev;
    + return device_register(&rmi_dev->dev);
    +}
    +EXPORT_SYMBOL(rmi_register_phys_device);
    +
    +void rmi_unregister_phys_device(struct rmi_phys_device *phys)
    +{
    + struct rmi_device *rmi_dev = phys->rmi_dev;
    +
    + device_unregister(&rmi_dev->dev);
    + kfree(rmi_dev);
    +}
    +EXPORT_SYMBOL(rmi_unregister_phys_device);
    +
    +int rmi_register_driver(struct rmi_driver *driver)
    +{
    + driver->driver.bus = &rmi_bus_type;
    + return driver_register(&driver->driver);
    +}
    +EXPORT_SYMBOL(rmi_register_driver);
    +
    +static int __rmi_driver_remove(struct device *dev, void *data)
    +{
    + struct rmi_driver *driver = data;
    + struct rmi_device *rmi_dev = to_rmi_device(dev);
    +
    + if (rmi_dev->driver == driver)
    + rmi_dev->driver = NULL;
    +
    + return 0;
    +}
    +
    +void rmi_unregister_driver(struct rmi_driver *driver)
    +{
    + bus_for_each_dev(&rmi_bus_type, NULL, driver, __rmi_driver_remove);
    + driver_unregister(&driver->driver);
    +}
    +EXPORT_SYMBOL(rmi_unregister_driver);
    +
    +static int __rmi_bus_fh_add(struct device *dev, void *data)
    +{
    + struct rmi_driver *driver;
    + struct rmi_device *rmi_dev = to_rmi_device(dev);
    +
    + driver = rmi_dev->driver;
    + if (driver && driver->fh_add)
    + driver->fh_add(rmi_dev, data);
    +
    + return 0;
    +}
    +
    +int rmi_register_function_driver(struct rmi_function_handler *fh)
    +{
    + struct rmi_function_list *entry;
    + struct rmi_function_handler *fh_dup;
    +
    + fh_dup = rmi_get_function_handler(fh->func);
    + if (fh_dup) {
    + pr_err("%s: function f%.2x already registered!\n", __func__,
    + fh->func);
    + return -EINVAL;
    + }
    +
    + entry = kzalloc(sizeof(struct rmi_function_list), GFP_KERNEL);
    + if (!entry)
    + return -ENOMEM;
    +
    + entry->fh = fh;
    + list_add_tail(&entry->list, &rmi_supported_functions.list);
    +
    + /* notify devices of the new function handler */
    + bus_for_each_dev(&rmi_bus_type, NULL, fh, __rmi_bus_fh_add);
    +
    + return 0;
    +}
    +EXPORT_SYMBOL(rmi_register_function_driver);
    +
    +static int __rmi_bus_fh_remove(struct device *dev, void *data)
    +{
    + struct rmi_driver *driver;
    + struct rmi_device *rmi_dev = to_rmi_device(dev);
    +
    + driver = rmi_dev->driver;
    + if (driver && driver->fh_remove)
    + driver->fh_remove(rmi_dev, data);
    +
    + return 0;
    +}
    +
    +void rmi_unregister_function_driver(struct rmi_function_handler *fh)
    +{
    + struct rmi_function_list *entry, *n;
    +
    + /* notify devices of the removal of the function handler */
    + bus_for_each_dev(&rmi_bus_type, NULL, fh, __rmi_bus_fh_remove);
    +
    + list_for_each_entry_safe(entry, n, &rmi_supported_functions.list,
    + list) {
    + if (entry->fh->func == fh->func) {
    + list_del(&entry->list);
    + kfree(entry);
    + }
    + }
    +
    +}
    +EXPORT_SYMBOL(rmi_unregister_function_driver);
    +
    +struct rmi_function_handler *rmi_get_function_handler(int id)
    +{
    + struct rmi_function_list *entry;
    +
    + list_for_each_entry(entry, &rmi_supported_functions.list, list)
    + if (entry->fh->func == id)
    + return entry->fh;
    +
    + return NULL;
    +}
    +EXPORT_SYMBOL(rmi_get_function_handler);
    +
    +static void rmi_release_character_device(struct device *dev)
    +{
    + dev_dbg(dev, "%s: Called.\n", __func__);
    + return;
    +}
    +
    +static int rmi_register_character_device(struct device *dev, void *data)
    +{
    + struct rmi_device *rmi_dev;
    + struct rmi_char_driver *char_driver = data;
    + struct rmi_char_device *char_dev;
    + int retval;
    +
    + dev_dbg(dev, "Attaching character device.\n");
    + rmi_dev = to_rmi_device(dev);
    + if (char_driver->match && !char_driver->match(rmi_dev))
    + return 0;
    +
    + if (!char_driver->init) {
    + dev_err(dev, "ERROR: No init() function in %s.\n", __func__);
    + return -EINVAL;
    + }
    +
    + char_dev = kzalloc(sizeof(struct rmi_char_device), GFP_KERNEL);
    + if (!char_dev)
    + return -ENOMEM;
    +
    + char_dev->rmi_dev = rmi_dev;
    + char_dev->driver = char_driver;
    +
    + char_dev->dev.parent = dev;
    + char_dev->dev.release = rmi_release_character_device;
    + char_dev->dev.driver = &char_driver->driver;
    + retval = device_register(&char_dev->dev);
    + if (!retval) {
    + dev_err(dev, "Failed to register character device.\n");
    + goto error_exit;
    + }
    +
    + retval = char_driver->init(char_dev);
    + if (retval) {
    + dev_err(dev, "Failed to initialize character device.\n");
    + goto error_exit;
    + }
    +
    + mutex_lock(&rmi_bus_mutex);
    + list_add_tail(&char_dev->list, &char_driver->devices);
    + mutex_unlock(&rmi_bus_mutex);
    + dev_info(&char_dev->dev, "Registered a device.\n");
    + return retval;
    +
    +error_exit:
    + kfree(char_dev);
    + return retval;
    +}
    +
    +int rmi_register_character_driver(struct rmi_char_driver *char_driver)
    +{
    + struct rmi_character_driver_list *entry;
    + int retval;
    +
    + pr_debug("%s: Registering character driver %s.\n", __func__,
    + char_driver->driver.name);
    +
    + char_driver->driver.bus = &rmi_bus_type;
    + INIT_LIST_HEAD(&char_driver->devices);
    + retval = driver_register(&char_driver->driver);
    + if (retval) {
    + pr_err("%s: Failed to register %s, code: %d.\n", __func__,
    + char_driver->driver.name, retval);
    + return retval;
    + }
    +
    + entry = kzalloc(sizeof(struct rmi_character_driver_list), GFP_KERNEL);
    + if (!entry)
    + return -ENOMEM;
    + entry->cd = char_driver;
    +
    + mutex_lock(&rmi_bus_mutex);
    + list_add_tail(&entry->list, &rmi_character_drivers.list);
    + mutex_unlock(&rmi_bus_mutex);
    +
    + /* notify devices of the removal of the function handler */
    + bus_for_each_dev(&rmi_bus_type, NULL, char_driver,
    + rmi_register_character_device);
    +
    + return 0;
    +}
    +EXPORT_SYMBOL(rmi_register_character_driver);
    +
    +
    +int rmi_unregister_character_driver(struct rmi_char_driver *char_driver)
    +{
    + struct rmi_character_driver_list *entry, *n;
    + struct rmi_char_device *char_dev, *m;
    + pr_debug("%s: Unregistering character driver %s.\n", __func__,
    + char_driver->driver.name);
    +
    + mutex_lock(&rmi_bus_mutex);
    + list_for_each_entry_safe(char_dev, m, &char_driver->devices,
    + list) {
    + list_del(&char_dev->list);
    + char_dev->driver->remove(char_dev);
    + }
    + list_for_each_entry_safe(entry, n, &rmi_character_drivers.list,
    + list) {
    + if (entry->cd == char_driver) {
    + list_del(&entry->list);
    + kfree(entry);
    + }
    + }
    + mutex_unlock(&rmi_bus_mutex);
    +
    + driver_unregister(&char_driver->driver);
    +
    + return 0;
    +}
    +EXPORT_SYMBOL(rmi_unregister_character_driver);
    +
    +static int __init rmi_bus_init(void)
    +{
    + int error;
    +
    + mutex_init(&rmi_bus_mutex);
    + INIT_LIST_HEAD(&rmi_supported_functions.list);
    + INIT_LIST_HEAD(&rmi_character_drivers.list);
    +
    + error = bus_register(&rmi_bus_type);
    + if (error < 0) {
    + pr_err("%s: error registering the RMI bus: %d\n", __func__,
    + error);
    + return error;
    + }
    + pr_info("%s: successfully registered RMI bus.\n", __func__);
    +
    + return 0;
    +}
    +
    +static void __exit rmi_bus_exit(void)
    +{
    + struct rmi_function_list *entry, *n;
    +
    + list_for_each_entry_safe(entry, n, &rmi_supported_functions.list,
    + list) {
    + list_del(&entry->list);
    + kfree(entry);
    + }
    +
    + bus_unregister(&rmi_bus_type);
    +}
    +
    +module_init(rmi_bus_init);
    +module_exit(rmi_bus_exit);
    +
    +MODULE_AUTHOR("Eric Andersson <eric.andersson@unixphere.com>");
    +MODULE_DESCRIPTION("RMI bus");
    +MODULE_LICENSE("GPL");
    diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c
    new file mode 100644
    index 0000000..07097bb
    --- /dev/null
    +++ b/drivers/input/rmi4/rmi_driver.c
    @@ -0,0 +1,1488 @@
    +/*
    + * Copyright (c) 2011 Synaptics Incorporated
    + * Copyright (c) 2011 Unixphere
    + *
    + * This driver adds support for generic RMI4 devices from Synpatics. It
    + * implements the mandatory f01 RMI register and depends on the presence of
    + * other required RMI functions.
    + *
    + * The RMI4 specification can be found here (URL split after files/ for
    + * style reasons):
    + * http://www.synaptics.com/sites/default/files/
    + * 511-000136-01-Rev-E-RMI4%20Intrfacing%20Guide.pdf
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + *
    + * 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.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program; if not, write to the Free Software
    + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    + */
    +
    +#include <linux/kernel.h>
    +#include <linux/delay.h>
    +#include <linux/device.h>
    +#include <linux/module.h>
    +#include <linux/device.h>
    +#include <linux/slab.h>
    +#include <linux/list.h>
    +#include <linux/pm.h>
    +#include <linux/rmi.h>
    +#include "rmi_driver.h"
    +
    +#define DELAY_DEBUG 0
    +#define REGISTER_DEBUG 0
    +
    +#define PDT_END_SCAN_LOCATION 0x0005
    +#define PDT_PROPERTIES_LOCATION 0x00EF
    +#define BSR_LOCATION 0x00FE
    +#define HAS_BSR_MASK 0x20
    +#define HAS_NONSTANDARD_PDT_MASK 0x40
    +#define RMI4_END_OF_PDT(id) ((id) == 0x00 || (id) == 0xff)
    +#define RMI4_MAX_PAGE 0xff
    +#define RMI4_PAGE_SIZE 0x100
    +
    +#define RMI_DEVICE_RESET_CMD 0x01
    +#define DEFAULT_RESET_DELAY_MS 20
    +
    +#ifdef CONFIG_HAS_EARLYSUSPEND
    +static void rmi_driver_early_suspend(struct early_suspend *h);
    +static void rmi_driver_late_resume(struct early_suspend *h);
    +#endif
    +
    +/* sysfs files for attributes for driver values. */
    +static ssize_t rmi_driver_hasbsr_show(struct device *dev,
    + struct device_attribute *attr, char *buf);
    +
    +static ssize_t rmi_driver_bsr_show(struct device *dev,
    + struct device_attribute *attr, char *buf);
    +
    +static ssize_t rmi_driver_bsr_store(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count);
    +
    +static ssize_t rmi_driver_enabled_show(struct device *dev,
    + struct device_attribute *attr,
    + char *buf);
    +
    +static ssize_t rmi_driver_enabled_store(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count);
    +
    +static ssize_t rmi_driver_phys_show(struct device *dev,
    + struct device_attribute *attr,
    + char *buf);
    +
    +static ssize_t rmi_driver_version_show(struct device *dev,
    + struct device_attribute *attr,
    + char *buf);
    +
    +#if REGISTER_DEBUG
    +static ssize_t rmi_driver_reg_store(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count);
    +#endif
    +
    +#if DELAY_DEBUG
    +static ssize_t rmi_delay_show(struct device *dev,
    + struct device_attribute *attr,
    + char *buf);
    +
    +static ssize_t rmi_delay_store(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count);
    +#endif
    +
    +static int rmi_driver_process_reset_requests(struct rmi_device *rmi_dev);
    +
    +static int rmi_driver_process_config_requests(struct rmi_device *rmi_dev);
    +
    +static int rmi_driver_irq_restore(struct rmi_device *rmi_dev);
    +
    +static struct device_attribute attrs[] = {
    + __ATTR(hasbsr, RMI_RO_ATTR,
    + rmi_driver_hasbsr_show, rmi_store_error),
    + __ATTR(bsr, RMI_RW_ATTR,
    + rmi_driver_bsr_show, rmi_driver_bsr_store),
    + __ATTR(enabled, RMI_RW_ATTR,
    + rmi_driver_enabled_show, rmi_driver_enabled_store),
    + __ATTR(phys, RMI_RO_ATTR,
    + rmi_driver_phys_show, rmi_store_error),
    +#if REGISTER_DEBUG
    + __ATTR(reg, RMI_WO_ATTR,
    + rmi_show_error, rmi_driver_reg_store),
    +#endif
    +#if DELAY_DEBUG
    + __ATTR(delay, RMI_RW_ATTR,
    + rmi_delay_show, rmi_delay_store),
    +#endif
    + __ATTR(version, RMI_RO_ATTR,
    + rmi_driver_version_show, rmi_store_error),
    +};
    +
    +/* Useful helper functions for u8* */
    +
    +void u8_set_bit(u8 *target, int pos)
    +{
    + target[pos/8] |= 1<<pos%8;
    +}
    +
    +void u8_clear_bit(u8 *target, int pos)
    +{
    + target[pos/8] &= ~(1<<pos%8);
    +}
    +
    +bool u8_is_set(u8 *target, int pos)
    +{
    + return target[pos/8] & 1<<pos%8;
    +}
    +
    +bool u8_is_any_set(u8 *target, int size)
    +{
    + int i;
    + for (i = 0; i < size; i++) {
    + if (target[i])
    + return true;
    + }
    + return false;
    +}
    +
    +void u8_or(u8 *dest, u8 *target1, u8 *target2, int size)
    +{
    + int i;
    + for (i = 0; i < size; i++)
    + dest[i] = target1[i] | target2[i];
    +}
    +
    +void u8_and(u8 *dest, u8 *target1, u8 *target2, int size)
    +{
    + int i;
    + for (i = 0; i < size; i++)
    + dest[i] = target1[i] & target2[i];
    +}
    +
    +static bool has_bsr(struct rmi_driver_data *data)
    +{
    + return (data->pdt_props & HAS_BSR_MASK) != 0;
    +}
    +
    +/* Utility routine to set bits in a register. */
    +int rmi_set_bits(struct rmi_device *rmi_dev, unsigned short address,
    + unsigned char bits)
    +{
    + unsigned char reg_contents;
    + int retval;
    +
    + retval = rmi_read_block(rmi_dev, address, &reg_contents, 1);
    + if (retval)
    + return retval;
    + reg_contents = reg_contents | bits;
    + retval = rmi_write_block(rmi_dev, address, &reg_contents, 1);
    + if (retval == 1)
    + return 0;
    + else if (retval == 0)
    + return -EIO;
    + return retval;
    +}
    +EXPORT_SYMBOL(rmi_set_bits);
    +
    +/* Utility routine to clear bits in a register. */
    +int rmi_clear_bits(struct rmi_device *rmi_dev, unsigned short address,
    + unsigned char bits)
    +{
    + unsigned char reg_contents;
    + int retval;
    +
    + retval = rmi_read_block(rmi_dev, address, &reg_contents, 1);
    + if (retval)
    + return retval;
    + reg_contents = reg_contents & ~bits;
    + retval = rmi_write_block(rmi_dev, address, &reg_contents, 1);
    + if (retval == 1)
    + return 0;
    + else if (retval == 0)
    + return -EIO;
    + return retval;
    +}
    +EXPORT_SYMBOL(rmi_clear_bits);
    +
    +static void rmi_free_function_list(struct rmi_device *rmi_dev)
    +{
    + struct rmi_function_container *entry, *n;
    + struct rmi_driver_data *data = rmi_get_driverdata(rmi_dev);
    +
    + if (!data) {
    + dev_err(&rmi_dev->dev, "WTF: No driver data in %s\n", __func__);
    + return;
    + }
    +
    + if (list_empty(&data->rmi_functions.list))
    + return;
    +
    + list_for_each_entry_safe(entry, n, &data->rmi_functions.list, list) {
    + kfree(entry->irq_mask);
    + list_del(&entry->list);
    + }
    +}
    +
    +void no_op(struct device *dev)
    +{
    + dev_dbg(dev, "REMOVING KOBJ!");
    + kobject_put(&dev->kobj);
    +}
    +
    +static int init_one_function(struct rmi_device *rmi_dev,
    + struct rmi_function_container *fc)
    +{
    + int retval;
    +
    + if (!fc->fh) {
    + struct rmi_function_handler *fh =
    + rmi_get_function_handler(fc->fd.function_number);
    + if (!fh) {
    + dev_dbg(&rmi_dev->dev, "No handler for F%02X.\n",
    + fc->fd.function_number);
    + return 0;
    + }
    + fc->fh = fh;
    + }
    +
    + if (!fc->fh->init)
    + return 0;
    + /* This memset might not be what we want to do... */
    + memset(&(fc->dev), 0, sizeof(struct device));
    + dev_set_name(&(fc->dev), "fn%02x", fc->fd.function_number);
    + fc->dev.release = no_op;
    +
    + fc->dev.parent = &rmi_dev->dev;
    + dev_dbg(&rmi_dev->dev, "%s: Register F%02X.\n", __func__,
    + fc->fd.function_number);
    + retval = device_register(&fc->dev);
    + if (retval) {
    + dev_err(&rmi_dev->dev, "Failed device_register for F%02X.\n",
    + fc->fd.function_number);
    + return retval;
    + }
    +
    + retval = fc->fh->init(fc);
    + if (retval < 0) {
    + dev_err(&rmi_dev->dev, "Failed to initialize function F%02x\n",
    + fc->fd.function_number);
    + goto error_exit;
    + }
    +
    + return 0;
    +
    +error_exit:
    + device_unregister(&fc->dev);
    + return retval;
    +}
    +
    +static void rmi_driver_fh_add(struct rmi_device *rmi_dev,
    + struct rmi_function_handler *fh)
    +{
    + struct rmi_function_container *entry;
    + struct rmi_driver_data *data = rmi_get_driverdata(rmi_dev);
    +
    + if (!data)
    + return;
    + if (fh->func == 0x01) {
    + if (data->f01_container)
    + data->f01_container->fh = fh;
    + } else if (!list_empty(&data->rmi_functions.list)) {
    + mutex_lock(&data->pdt_mutex);
    + list_for_each_entry(entry, &data->rmi_functions.list, list)
    + if (entry->fd.function_number == fh->func) {
    + entry->fh = fh;
    + init_one_function(rmi_dev, entry);
    + }
    + mutex_unlock(&data->pdt_mutex);
    + }
    +
    +}
    +
    +static void rmi_driver_fh_remove(struct rmi_device *rmi_dev,
    + struct rmi_function_handler *fh)
    +{
    + struct rmi_function_container *entry, *temp;
    + struct rmi_driver_data *data = rmi_get_driverdata(rmi_dev);
    +
    + list_for_each_entry_safe(entry, temp, &data->rmi_functions.list,
    + list) {
    + if (entry->fd.function_number == fh->func) {
    + if (fh->remove)
    + fh->remove(entry);
    +
    + entry->fh = NULL;
    + device_unregister(&entry->dev);
    + }
    + }
    +}
    +
    +
    +static int rmi_driver_process_reset_requests(struct rmi_device *rmi_dev)
    +{
    + struct rmi_driver_data *data = rmi_get_driverdata(rmi_dev);
    + struct device *dev = &rmi_dev->dev;
    + struct rmi_function_container *entry;
    + int error;
    +
    + /* Device control (F01) is handled before anything else. */
    +
    + if (data->f01_container->fh->reset) {
    + error = data->f01_container->fh->reset(data->f01_container);
    + if (error < 0) {
    + dev_err(dev, "%s: f%.2x"
    + " reset handler failed:"
    + " %d\n", __func__,
    + data->f01_container->fh->func, error);
    + return error;
    + }
    + }
    +
    + list_for_each_entry(entry, &data->rmi_functions.list, list) {
    + if (entry->fh->reset) {
    + error = entry->fh->reset(entry);
    + if (error < 0) {
    + dev_err(dev, "%s: f%.2x"
    + " reset handler failed:"
    + " %d\n", __func__,
    + entry->fh->func, error);
    + return error;
    + }
    + }
    +
    + }
    +
    + return 0;
    +}
    +
    +
    +static int rmi_driver_process_config_requests(struct rmi_device *rmi_dev)
    +{
    + struct rmi_driver_data *data = rmi_get_driverdata(rmi_dev);
    + struct device *dev = &rmi_dev->dev;
    + struct rmi_function_container *entry;
    + int error;
    +
    + /* Device control (F01) is handled before anything else. */
    +
    + if (data->f01_container->fh->config) {
    + error = data->f01_container->fh->config(data->f01_container);
    + if (error < 0) {
    + dev_err(dev, "%s: f%.2x"
    + " config handler failed:"
    + " %d\n", __func__,
    + data->f01_container->fh->func, error);
    + return error;
    + }
    + }
    +
    + list_for_each_entry(entry, &data->rmi_functions.list, list) {
    + if (entry->fh->config) {
    + error = entry->fh->config(entry);
    + if (error < 0) {
    + dev_err(dev, "%s: f%.2x"
    + " config handler failed:"
    + " %d\n", __func__,
    + entry->fh->func, error);
    + return error;
    + }
    + }
    + }
    +
    + return 0;
    +}
    +
    +static void construct_mask(u8 *mask, int num, int pos)
    +{
    + int i;
    +
    + for (i = 0; i < num; i++)
    + u8_set_bit(mask, pos+i);
    +}
    +
    +static int process_interrupt_requests(struct rmi_device *rmi_dev)
    +{
    + struct rmi_driver_data *data = rmi_get_driverdata(rmi_dev);
    + struct device *dev = &rmi_dev->dev;
    + struct rmi_function_container *entry;
    + u8 irq_status[data->num_of_irq_regs];
    + u8 irq_bits[data->num_of_irq_regs];
    + int error;
    +
    + error = rmi_read_block(rmi_dev,
    + data->f01_container->fd.data_base_addr + 1,
    + irq_status, data->num_of_irq_regs);
    + if (error < 0) {
    + dev_err(dev, "%s: failed to read irqs.", __func__);
    + return error;
    + }
    + /* Device control (F01) is handled before anything else. */
    + u8_and(irq_bits, irq_status, data->f01_container->irq_mask,
    + data->num_of_irq_regs);
    + if (u8_is_any_set(irq_bits, data->num_of_irq_regs))
    + data->f01_container->fh->attention(
    + data->f01_container, irq_bits);
    +
    + u8_and(irq_status, irq_status, data->current_irq_mask,
    + data->num_of_irq_regs);
    + /* At this point, irq_status has all bits that are set in the
    + * interrupt status register and are enabled.
    + */
    +
    + list_for_each_entry(entry, &data->rmi_functions.list, list)
    + if (entry->irq_mask && entry->fh && entry->fh->attention) {
    + u8_and(irq_bits, irq_status, entry->irq_mask,
    + data->num_of_irq_regs);
    + if (u8_is_any_set(irq_bits, data->num_of_irq_regs)) {
    + error = entry->fh->attention(entry, irq_bits);
    + if (error < 0)
    + dev_err(dev, "%s: f%.2x"
    + " attention handler failed:"
    + " %d\n", __func__,
    + entry->fh->func, error);
    + }
    + }
    +
    + return 0;
    +}
    +
    +static int rmi_driver_irq_handler(struct rmi_device *rmi_dev, int irq)
    +{
    + struct rmi_driver_data *data = rmi_get_driverdata(rmi_dev);
    +
    + /* Can get called before the driver is fully ready to deal with
    + * interrupts.
    + */
    + if (!data || !data->f01_container || !data->f01_container->fh) {
    + dev_warn(&rmi_dev->dev,
    + "Not ready to handle interrupts yet!\n");
    + return 0;
    + }
    +
    + return process_interrupt_requests(rmi_dev);
    +}
    +
    +
    +static int rmi_driver_reset_handler(struct rmi_device *rmi_dev)
    +{
    + struct rmi_driver_data *data = rmi_get_driverdata(rmi_dev);
    + int error;
    +
    + /* Can get called before the driver is fully ready to deal with
    + * interrupts.
    + */
    + if (!data || !data->f01_container || !data->f01_container->fh) {
    + dev_warn(&rmi_dev->dev,
    + "Not ready to handle reset yet!\n");
    + return 0;
    + }
    +
    + error = rmi_driver_process_reset_requests(rmi_dev);
    + if (error < 0)
    + return error;
    +
    +
    + error = rmi_driver_process_config_requests(rmi_dev);
    + if (error < 0)
    + return error;
    +
    + if (data->irq_stored) {
    + error = rmi_driver_irq_restore(rmi_dev);
    + if (error < 0)
    + return error;
    + }
    +
    + dev_err(&rmi_dev->dev, "DEBUG 5!\n");
    +
    + return 0;
    +}
    +
    +
    +
    +/*
    + * Construct a function's IRQ mask. This should
    + * be called once and stored.
    + */
    +static u8 *rmi_driver_irq_get_mask(struct rmi_device *rmi_dev,
    + struct rmi_function_container *fc) {
    + struct rmi_driver_data *data = rmi_get_driverdata(rmi_dev);
    +
    + u8 *irq_mask = kzalloc(sizeof(u8)*data->num_of_irq_regs, GFP_KERNEL);
    + if (irq_mask)
    + construct_mask(irq_mask, fc->num_of_irqs, fc->irq_pos);
    +
    + return irq_mask;
    +}
    +
    +/*
    + * This pair of functions allows functions like function 54 to request to have
    + * other interupts disabled until the restore function is called. Only one store
    + * happens at a time.
    + */
    +static int rmi_driver_irq_save(struct rmi_device *rmi_dev, u8 * new_ints)
    +{
    + int retval = 0;
    + struct rmi_driver_data *data = rmi_get_driverdata(rmi_dev);
    + struct device *dev = &rmi_dev->dev;
    +
    + mutex_lock(&data->irq_mutex);
    + if (!data->irq_stored) {
    + /* Save current enabled interupts */
    + retval = rmi_read_block(rmi_dev,
    + data->f01_container->fd.control_base_addr+1,
    + data->irq_mask_store, data->num_of_irq_regs);
    + if (retval < 0) {
    + dev_err(dev, "%s: Failed to read enabled interrupts!",
    + __func__);
    + goto error_unlock;
    + }
    + /*
    + * Disable every interupt except for function 54
    + * TODO:Will also want to not disable function 1-like functions.
    + * No need to take care of this now, since there's no good way
    + * to identify them.
    + */
    + retval = rmi_write_block(rmi_dev,
    + data->f01_container->fd.control_base_addr+1,
    + new_ints, data->num_of_irq_regs);
    + if (retval < 0) {
    + dev_err(dev, "%s: Failed to change enabled interrupts!",
    + __func__);
    + goto error_unlock;
    + }
    + memcpy(data->current_irq_mask, new_ints,
    + data->num_of_irq_regs * sizeof(u8));
    + data->irq_stored = true;
    + } else {
    + retval = -ENOSPC; /* No space to store IRQs.*/
    + dev_err(dev, "%s: Attempted to save values when"
    + " already stored!", __func__);
    + }
    +
    +error_unlock:
    + mutex_unlock(&data->irq_mutex);
    + return retval;
    +}
    +
    +static int rmi_driver_irq_restore(struct rmi_device *rmi_dev)
    +{
    + int retval = 0;
    + struct rmi_driver_data *data = rmi_get_driverdata(rmi_dev);
    + struct device *dev = &rmi_dev->dev;
    + mutex_lock(&data->irq_mutex);
    +
    + if (data->irq_stored) {
    + retval = rmi_write_block(rmi_dev,
    + data->f01_container->fd.control_base_addr+1,
    + data->irq_mask_store, data->num_of_irq_regs);
    + if (retval < 0) {
    + dev_err(dev, "%s: Failed to write enabled interupts!",
    + __func__);
    + goto error_unlock;
    + }
    + memcpy(data->current_irq_mask, data->irq_mask_store,
    + data->num_of_irq_regs * sizeof(u8));
    + data->irq_stored = false;
    + } else {
    + retval = -EINVAL;
    + dev_err(dev, "%s: Attempted to restore values when not stored!",
    + __func__);
    + }
    +
    +error_unlock:
    + mutex_unlock(&data->irq_mutex);
    + return retval;
    +}
    +
    +static int rmi_driver_fn_generic(struct rmi_device *rmi_dev,
    + struct pdt_entry *pdt_ptr,
    + int *current_irq_count,
    + u16 page_start)
    +{
    + struct rmi_driver_data *data = rmi_get_driverdata(rmi_dev);
    + struct rmi_function_container *fc = NULL;
    + int retval = 0;
    + struct device *dev = &rmi_dev->dev;
    + struct rmi_device_platform_data *pdata;
    +
    + pdata = to_rmi_platform_data(rmi_dev);
    +
    + dev_info(dev, "Initializing F%02X for %s.\n", pdt_ptr->function_number,
    + pdata->sensor_name);
    +
    + fc = kzalloc(sizeof(struct rmi_function_container),
    + GFP_KERNEL);
    + if (!fc) {
    + dev_err(dev, "Failed to allocate container for F%02X.\n",
    + pdt_ptr->function_number);
    + retval = -ENOMEM;
    + goto error_free_data;
    + }
    +
    + copy_pdt_entry_to_fd(pdt_ptr, &fc->fd, page_start);
    +
    + fc->rmi_dev = rmi_dev;
    + fc->num_of_irqs = pdt_ptr->interrupt_source_count;
    + fc->irq_pos = *current_irq_count;
    + *current_irq_count += fc->num_of_irqs;
    +
    + retval = init_one_function(rmi_dev, fc);
    + if (retval < 0) {
    + dev_err(dev, "Failed to initialize F%.2x\n",
    + pdt_ptr->function_number);
    + kfree(fc);
    + goto error_free_data;
    + }
    +
    + list_add_tail(&fc->list, &data->rmi_functions.list);
    + return 0;
    +
    +error_free_data:
    + kfree(fc);
    + return retval;
    +}
    +
    +/*
    + * F01 was once handled very differently from all other functions. It is
    + * now only slightly special, and as the driver is refined we expect this
    + * function to go away.
    + */
    +static int rmi_driver_fn_01_specific(struct rmi_device *rmi_dev,
    + struct pdt_entry *pdt_ptr,
    + int *current_irq_count,
    + u16 page_start)
    +{
    + struct rmi_driver_data *data = NULL;
    + struct rmi_function_container *fc = NULL;
    + int retval = 0;
    + struct device *dev = &rmi_dev->dev;
    + struct rmi_function_handler *fh =
    + rmi_get_function_handler(0x01);
    + struct rmi_device_platform_data *pdata;
    +
    + pdata = to_rmi_platform_data(rmi_dev);
    + data = rmi_get_driverdata(rmi_dev);
    +
    + dev_info(dev, "Initializing F01 for %s.\n", pdata->sensor_name);
    + if (!fh)
    + dev_dbg(dev, "%s: No function handler for F01?!", __func__);
    +
    + fc = kzalloc(sizeof(struct rmi_function_container), GFP_KERNEL);
    + if (!fc) {
    + retval = -ENOMEM;
    + return retval;
    + }
    +
    + copy_pdt_entry_to_fd(pdt_ptr, &fc->fd, page_start);
    + fc->num_of_irqs = pdt_ptr->interrupt_source_count;
    + fc->irq_pos = *current_irq_count;
    + *current_irq_count += fc->num_of_irqs;
    +
    + fc->rmi_dev = rmi_dev;
    + fc->dev.parent = &fc->rmi_dev->dev;
    + fc->fh = fh;
    +
    + dev_set_name(&(fc->dev), "fn%02x", fc->fd.function_number);
    + fc->dev.release = no_op;
    +
    + dev_dbg(dev, "%s: Register F01.\n", __func__);
    + retval = device_register(&fc->dev);
    + if (retval) {
    + dev_err(dev, "%s: Failed device_register for F01.\n", __func__);
    + goto error_free_data;
    + }
    +
    + data->f01_container = fc;
    +
    + return retval;
    +
    +error_free_data:
    + kfree(fc);
    + return retval;
    +}
    +
    +/*
    + * Scan the PDT for F01 so we can force a reset before anything else
    + * is done. This forces the sensor into a known state, and also
    + * forces application of any pending updates from reflashing the
    + * firmware or configuration. We have to do this before actually
    + * building the PDT because the reflash might cause various registers
    + * to move around.
    + */
    +static int do_initial_reset(struct rmi_device *rmi_dev)
    +{
    + struct pdt_entry pdt_entry;
    + int page;
    + struct device *dev = &rmi_dev->dev;
    + bool done = false;
    + int i;
    + int retval;
    + struct rmi_device_platform_data *pdata;
    +
    + dev_dbg(dev, "Initial reset.\n");
    + pdata = to_rmi_platform_data(rmi_dev);
    + for (page = 0; (page <= RMI4_MAX_PAGE) && !done; page++) {
    + u16 page_start = RMI4_PAGE_SIZE * page;
    + u16 pdt_start = page_start + PDT_START_SCAN_LOCATION;
    + u16 pdt_end = page_start + PDT_END_SCAN_LOCATION;
    +
    + done = true;
    + for (i = pdt_start; i >= pdt_end; i -= sizeof(pdt_entry)) {
    + retval = rmi_read_block(rmi_dev, i, (u8 *)&pdt_entry,
    + sizeof(pdt_entry));
    + if (retval != sizeof(pdt_entry)) {
    + dev_err(dev, "Read PDT entry at 0x%04x"
    + "failed, code = %d.\n", i, retval);
    + return retval;
    + }
    +
    + if (RMI4_END_OF_PDT(pdt_entry.function_number))
    + break;
    + done = false;
    +
    + if (pdt_entry.function_number == 0x01) {
    + u16 cmd_addr = page_start +
    + pdt_entry.command_base_addr;
    + u8 cmd_buf = RMI_DEVICE_RESET_CMD;
    + retval = rmi_write_block(rmi_dev, cmd_addr,
    + &cmd_buf, 1);
    + if (retval < 0) {
    + dev_err(dev, "Initial reset failed. "
    + "Code = %d.\n", retval);
    + return retval;
    + }
    + mdelay(pdata->reset_delay_ms);
    + return 0;
    + }
    + }
    + }
    +
    + dev_warn(dev, "WARNING: Failed to find F01 for initial reset.\n");
    + return -ENODEV;
    +}
    +
    +static int rmi_scan_pdt(struct rmi_device *rmi_dev)
    +{
    + struct rmi_driver_data *data;
    + struct pdt_entry pdt_entry;
    + int page;
    + struct device *dev = &rmi_dev->dev;
    + int irq_count = 0;
    + bool done = false;
    + int i;
    + int retval;
    +
    + dev_info(dev, "Scanning PDT...\n");
    +
    + data = rmi_get_driverdata(rmi_dev);
    + mutex_lock(&data->pdt_mutex);
    +
    + for (page = 0; (page <= RMI4_MAX_PAGE) && !done; page++) {
    + u16 page_start = RMI4_PAGE_SIZE * page;
    + u16 pdt_start = page_start + PDT_START_SCAN_LOCATION;
    + u16 pdt_end = page_start + PDT_END_SCAN_LOCATION;
    +
    + done = true;
    + for (i = pdt_start; i >= pdt_end; i -= sizeof(pdt_entry)) {
    + retval = rmi_read_block(rmi_dev, i, (u8 *)&pdt_entry,
    + sizeof(pdt_entry));
    + if (retval != sizeof(pdt_entry)) {
    + dev_err(dev, "Read PDT entry at 0x%04x "
    + "failed.\n", i);
    + goto error_exit;
    + }
    +
    + if (RMI4_END_OF_PDT(pdt_entry.function_number))
    + break;
    +
    + dev_dbg(dev, "%s: Found F%.2X on page 0x%02X\n",
    + __func__, pdt_entry.function_number, page);
    + done = false;
    +
    + if (pdt_entry.function_number == 0x01)
    + retval = rmi_driver_fn_01_specific(rmi_dev,
    + &pdt_entry, &irq_count,
    + page_start);
    + else
    + retval = rmi_driver_fn_generic(rmi_dev,
    + &pdt_entry, &irq_count,
    + page_start);
    +
    + if (retval)
    + goto error_exit;
    + }
    + }
    + data->num_of_irq_regs = (irq_count + 7) / 8;
    + dev_dbg(dev, "%s: Done with PDT scan.\n", __func__);
    + retval = 0;
    +
    +error_exit:
    + mutex_unlock(&data->pdt_mutex);
    + return retval;
    +}
    +
    +static int rmi_driver_probe(struct rmi_device *rmi_dev)
    +{
    + struct rmi_driver_data *data = NULL;
    + struct rmi_function_container *fc;
    + struct rmi_device_platform_data *pdata;
    + int error = 0;
    + struct device *dev = &rmi_dev->dev;
    + int attr_count = 0;
    +
    + dev_dbg(dev, "%s: Starting probe.\n", __func__);
    +
    + pdata = to_rmi_platform_data(rmi_dev);
    +
    + data = kzalloc(sizeof(struct rmi_driver_data), GFP_KERNEL);
    + if (!data) {
    + dev_err(dev, "%s: Failed to allocate driver data.\n", __func__);
    + return -ENOMEM;
    + }
    + INIT_LIST_HEAD(&data->rmi_functions.list);
    + rmi_set_driverdata(rmi_dev, data);
    + mutex_init(&data->pdt_mutex);
    +
    + if (!pdata->reset_delay_ms)
    + pdata->reset_delay_ms = DEFAULT_RESET_DELAY_MS;
    + error = do_initial_reset(rmi_dev);
    + if (error)
    + dev_warn(dev, "RMI initial reset failed! Soldiering on.\n");
    +
    +
    + error = rmi_scan_pdt(rmi_dev);
    + if (error) {
    + dev_err(dev, "PDT scan for %s failed with code %d.\n",
    + pdata->sensor_name, error);
    + goto err_free_data;
    + }
    +
    + if (!data->f01_container) {
    + dev_err(dev, "missing F01 container!\n");
    + error = -EINVAL;
    + goto err_free_data;
    + }
    +
    + data->f01_container->irq_mask = kzalloc(
    + sizeof(u8)*data->num_of_irq_regs, GFP_KERNEL);
    + if (!data->f01_container->irq_mask) {
    + dev_err(dev, "Failed to allocate F01 IRQ mask.\n");
    + error = -ENOMEM;
    + goto err_free_data;
    + }
    + construct_mask(data->f01_container->irq_mask,
    + data->f01_container->num_of_irqs,
    + data->f01_container->irq_pos);
    + list_for_each_entry(fc, &data->rmi_functions.list, list)
    + fc->irq_mask = rmi_driver_irq_get_mask(rmi_dev, fc);
    +
    + error = rmi_driver_f01_init(rmi_dev);
    + if (error < 0) {
    + dev_err(dev, "Failed to initialize F01.\n");
    + goto err_free_data;
    + }
    +
    + error = rmi_read(rmi_dev, PDT_PROPERTIES_LOCATION,
    + (char *) &data->pdt_props);
    + if (error < 0) {
    + /* we'll print out a warning and continue since
    + * failure to get the PDT properties is not a cause to fail
    + */
    + dev_warn(dev, "Could not read PDT properties from 0x%04x. "
    + "Assuming 0x00.\n", PDT_PROPERTIES_LOCATION);
    + }
    +
    + dev_dbg(dev, "%s: Creating sysfs files.", __func__);
    + for (attr_count = 0; attr_count < ARRAY_SIZE(attrs); attr_count++) {
    + error = device_create_file(dev, &attrs[attr_count]);
    + if (error < 0) {
    + dev_err(dev, "%s: Failed to create sysfs file %s.\n",
    + __func__, attrs[attr_count].attr.name);
    + goto err_free_data;
    + }
    + }
    +
    + __mutex_init(&data->irq_mutex, "irq_mutex", &data->irq_key);
    + data->current_irq_mask = kzalloc(sizeof(u8)*data->num_of_irq_regs,
    + GFP_KERNEL);
    + if (!data->current_irq_mask) {
    + dev_err(dev, "Failed to allocate current_irq_mask.\n");
    + error = -ENOMEM;
    + goto err_free_data;
    + }
    + error = rmi_read_block(rmi_dev,
    + data->f01_container->fd.control_base_addr+1,
    + data->current_irq_mask, data->num_of_irq_regs);
    + if (error < 0) {
    + dev_err(dev, "%s: Failed to read current IRQ mask.\n",
    + __func__);
    + goto err_free_data;
    + }
    + data->irq_mask_store = kzalloc(sizeof(u8)*data->num_of_irq_regs,
    + GFP_KERNEL);
    + if (!data->irq_mask_store) {
    + dev_err(dev, "Failed to allocate mask store.\n");
    + error = -ENOMEM;
    + goto err_free_data;
    + }
    +
    +#ifdef CONFIG_PM
    + data->pm_data = pdata->pm_data;
    + data->pre_suspend = pdata->pre_suspend;
    + data->post_resume = pdata->post_resume;
    +
    + mutex_init(&data->suspend_mutex);
    +
    +#ifdef CONFIG_HAS_EARLYSUSPEND
    + rmi_dev->early_suspend_handler.level =
    + EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1;
    + rmi_dev->early_suspend_handler.suspend = rmi_driver_early_suspend;
    + rmi_dev->early_suspend_handler.resume = rmi_driver_late_resume;
    + register_early_suspend(&rmi_dev->early_suspend_handler);
    +#endif /* CONFIG_HAS_EARLYSUSPEND */
    +#endif /* CONFIG_PM */
    + data->enabled = true;
    +
    + dev_info(dev, "connected RMI device manufacturer: %s product: %s\n",
    + data->manufacturer_id == 1 ? "synaptics" : "unknown",
    + data->product_id);
    +
    + return 0;
    +
    + err_free_data:
    + rmi_free_function_list(rmi_dev);
    + for (attr_count--; attr_count >= 0; attr_count--)
    + device_remove_file(dev, &attrs[attr_count]);
    + if (data) {
    + if (data->f01_container)
    + kfree(data->f01_container->irq_mask);
    + kfree(data->irq_mask_store);
    + kfree(data->current_irq_mask);
    + kfree(data);
    + rmi_set_driverdata(rmi_dev, NULL);
    + }
    + return error;
    +}
    +
    +#ifdef CONFIG_PM
    +static int rmi_driver_suspend(struct device *dev)
    +{
    + struct rmi_device *rmi_dev;
    + struct rmi_driver_data *data;
    + struct rmi_function_container *entry;
    + int retval = 0;
    +
    + rmi_dev = to_rmi_device(dev);
    + data = rmi_get_driverdata(rmi_dev);
    +
    + mutex_lock(&data->suspend_mutex);
    + if (data->suspended)
    + goto exit;
    +
    +#ifndef CONFIG_HAS_EARLYSUSPEND
    + if (data->pre_suspend) {
    + retval = data->pre_suspend(data->pm_data);
    + if (retval)
    + goto exit;
    + }
    +#endif /* !CONFIG_HAS_EARLYSUSPEND */
    +
    + list_for_each_entry(entry, &data->rmi_functions.list, list)
    + if (entry->fh && entry->fh->suspend) {
    + retval = entry->fh->suspend(entry);
    + if (retval < 0)
    + goto exit;
    + }
    +
    + if (data->f01_container && data->f01_container->fh
    + && data->f01_container->fh->suspend) {
    + retval = data->f01_container->fh->suspend(data->f01_container);
    + if (retval < 0)
    + goto exit;
    + }
    + data->suspended = true;
    +
    +exit:
    + mutex_unlock(&data->suspend_mutex);
    + return retval;
    +}
    +
    +static int rmi_driver_resume(struct device *dev)
    +{
    + struct rmi_device *rmi_dev;
    + struct rmi_driver_data *data;
    + struct rmi_function_container *entry;
    + int retval = 0;
    +
    + rmi_dev = to_rmi_device(dev);
    + data = rmi_get_driverdata(rmi_dev);
    +
    + mutex_lock(&data->suspend_mutex);
    + if (!data->suspended)
    + goto exit;
    +
    + if (data->f01_container && data->f01_container->fh
    + && data->f01_container->fh->resume) {
    + retval = data->f01_container->fh->resume(data->f01_container);
    + if (retval < 0)
    + goto exit;
    + }
    +
    + list_for_each_entry(entry, &data->rmi_functions.list, list)
    + if (entry->fh && entry->fh->resume) {
    + retval = entry->fh->resume(entry);
    + if (retval < 0)
    + goto exit;
    + }
    +
    +#ifndef CONFIG_HAS_EARLYSUSPEND
    + if (data->post_resume) {
    + retval = data->post_resume(data->pm_data);
    + if (retval)
    + goto exit;
    + }
    +#endif /* !CONFIG_HAS_EARLYSUSPEND */
    +
    + data->suspended = false;
    +
    +exit:
    + mutex_unlock(&data->suspend_mutex);
    + return retval;
    +}
    +
    +#ifdef CONFIG_HAS_EARLYSUSPEND
    +static void rmi_driver_early_suspend(struct early_suspend *h)
    +{
    + struct rmi_device *rmi_dev =
    + container_of(h, struct rmi_device, early_suspend_handler);
    + struct rmi_driver_data *data;
    + struct rmi_function_container *entry;
    + int retval = 0;
    +
    + data = rmi_get_driverdata(rmi_dev);
    + dev_dbg(&rmi_dev->dev, "Early suspend.\n");
    +
    + mutex_lock(&data->suspend_mutex);
    + if (data->suspended)
    + goto exit;
    +
    + if (data->pre_suspend) {
    + retval = data->pre_suspend(data->pm_data);
    + if (retval)
    + goto exit;
    + }
    +
    + list_for_each_entry(entry, &data->rmi_functions.list, list)
    + if (entry->fh && entry->fh->early_suspend) {
    + retval = entry->fh->early_suspend(entry);
    + if (retval < 0)
    + goto exit;
    + }
    +
    + if (data->f01_container && data->f01_container->fh
    + && data->f01_container->fh->early_suspend) {
    + retval = data->f01_container->fh->early_suspend(
    + data->f01_container);
    + if (retval < 0)
    + goto exit;
    + }
    + data->suspended = true;
    +
    +exit:
    + mutex_unlock(&data->suspend_mutex);
    +}
    +
    +static void rmi_driver_late_resume(struct early_suspend *h)
    +{
    + struct rmi_device *rmi_dev =
    + container_of(h, struct rmi_device, early_suspend_handler);
    + struct rmi_driver_data *data;
    + struct rmi_function_container *entry;
    + int retval = 0;
    +
    + data = rmi_get_driverdata(rmi_dev);
    + dev_dbg(&rmi_dev->dev, "Late resume.\n");
    +
    + mutex_lock(&data->suspend_mutex);
    + if (!data->suspended)
    + goto exit;
    +
    + if (data->f01_container && data->f01_container->fh
    + && data->f01_container->fh->late_resume) {
    + retval = data->f01_container->fh->late_resume(
    + data->f01_container);
    + if (retval < 0)
    + goto exit;
    + }
    +
    + list_for_each_entry(entry, &data->rmi_functions.list, list)
    + if (entry->fh && entry->fh->late_resume) {
    + retval = entry->fh->late_resume(entry);
    + if (retval < 0)
    + goto exit;
    + }
    +
    + if (data->post_resume) {
    + retval = data->post_resume(data->pm_data);
    + if (retval)
    + goto exit;
    + }
    +
    + data->suspended = false;
    +
    +exit:
    + mutex_unlock(&data->suspend_mutex);
    +}
    +#endif /* CONFIG_HAS_EARLYSUSPEND */
    +#endif /* CONFIG_PM */
    +
    +static int __devexit rmi_driver_remove(struct rmi_device *rmi_dev)
    +{
    + struct rmi_driver_data *data = rmi_get_driverdata(rmi_dev);
    + struct rmi_function_container *entry;
    + int i;
    +
    + list_for_each_entry(entry, &data->rmi_functions.list, list)
    + if (entry->fh && entry->fh->remove)
    + entry->fh->remove(entry);
    +
    + rmi_free_function_list(rmi_dev);
    + for (i = 0; i < ARRAY_SIZE(attrs); i++)
    + device_remove_file(&rmi_dev->dev, &attrs[i]);
    + kfree(data->f01_container->irq_mask);
    + kfree(data->irq_mask_store);
    + kfree(data->current_irq_mask);
    + kfree(data);
    +
    + return 0;
    +}
    +
    +#ifdef UNIVERSAL_DEV_PM_OPS
    +static UNIVERSAL_DEV_PM_OPS(rmi_driver_pm, rmi_driver_suspend,
    + rmi_driver_resume, NULL);
    +#endif
    +
    +static struct rmi_driver sensor_driver = {
    + .driver = {
    + .owner = THIS_MODULE,
    + .name = "rmi-generic",
    +#ifdef UNIVERSAL_DEV_PM_OPS
    + .pm = &rmi_driver_pm,
    +#endif
    + },
    + .probe = rmi_driver_probe,
    + .irq_handler = rmi_driver_irq_handler,
    + .reset_handler = rmi_driver_reset_handler,
    + .fh_add = rmi_driver_fh_add,
    + .fh_remove = rmi_driver_fh_remove,
    + .get_func_irq_mask = rmi_driver_irq_get_mask,
    + .store_irq_mask = rmi_driver_irq_save,
    + .restore_irq_mask = rmi_driver_irq_restore,
    + .remove = __devexit_p(rmi_driver_remove)
    +};
    +
    +/* sysfs show and store fns for driver attributes */
    +static ssize_t rmi_driver_hasbsr_show(struct device *dev,
    + struct device_attribute *attr,
    + char *buf)
    +{
    + struct rmi_device *rmi_dev;
    + struct rmi_driver_data *data;
    + rmi_dev = to_rmi_device(dev);
    + data = rmi_get_driverdata(rmi_dev);
    +
    + return snprintf(buf, PAGE_SIZE, "%u\n", has_bsr(data));
    +}
    +
    +static ssize_t rmi_driver_bsr_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + struct rmi_device *rmi_dev;
    + struct rmi_driver_data *data;
    + rmi_dev = to_rmi_device(dev);
    + data = rmi_get_driverdata(rmi_dev);
    +
    + return snprintf(buf, PAGE_SIZE, "%u\n", data->bsr);
    +}
    +
    +static ssize_t rmi_driver_bsr_store(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + int retval;
    + unsigned long val;
    + struct rmi_device *rmi_dev;
    + struct rmi_driver_data *data;
    +
    + rmi_dev = to_rmi_device(dev);
    + data = rmi_get_driverdata(rmi_dev);
    +
    + /* need to convert the string data to an actual value */
    + retval = strict_strtoul(buf, 10, &val);
    + if (retval < 0) {
    + dev_err(dev, "Invalid value '%s' written to BSR.\n", buf);
    + return -EINVAL;
    + }
    +
    + retval = rmi_write(rmi_dev, 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 retval;
    + }
    +
    + data->bsr = val;
    +
    + return count;
    +}
    +
    +static void disable_sensor(struct rmi_device *rmi_dev)
    +{
    + struct rmi_driver_data *data = rmi_get_driverdata(rmi_dev);
    +
    + rmi_dev->phys->disable_device(rmi_dev->phys);
    +
    + data->enabled = false;
    +}
    +
    +static int enable_sensor(struct rmi_device *rmi_dev)
    +{
    + struct rmi_driver_data *data = rmi_get_driverdata(rmi_dev);
    + int retval = 0;
    +
    + retval = rmi_dev->phys->enable_device(rmi_dev->phys);
    + /* non-zero means error occurred */
    + if (retval)
    + return retval;
    +
    + data->enabled = true;
    +
    + return 0;
    +}
    +
    +static ssize_t rmi_driver_enabled_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + struct rmi_device *rmi_dev;
    + struct rmi_driver_data *data;
    +
    + rmi_dev = to_rmi_device(dev);
    + data = rmi_get_driverdata(rmi_dev);
    +
    + return snprintf(buf, PAGE_SIZE, "%u\n", data->enabled);
    +}
    +
    +static ssize_t rmi_driver_enabled_store(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + int retval;
    + int new_value;
    + struct rmi_device *rmi_dev;
    + struct rmi_driver_data *data;
    +
    + rmi_dev = to_rmi_device(dev);
    + data = rmi_get_driverdata(rmi_dev);
    +
    + if (sysfs_streq(buf, "0"))
    + new_value = false;
    + else if (sysfs_streq(buf, "1"))
    + new_value = true;
    + else
    + return -EINVAL;
    +
    + if (new_value) {
    + retval = enable_sensor(rmi_dev);
    + if (retval) {
    + dev_err(dev, "Failed to enable sensor, code=%d.\n",
    + retval);
    + return -EIO;
    + }
    + } else {
    + disable_sensor(rmi_dev);
    + }
    +
    + return count;
    +}
    +
    +#if REGISTER_DEBUG
    +static ssize_t rmi_driver_reg_store(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + int retval;
    + unsigned int address;
    + unsigned int bytes;
    + struct rmi_device *rmi_dev;
    + struct rmi_driver_data *data;
    + u8 readbuf[128];
    + unsigned char outbuf[512];
    + unsigned char *bufptr = outbuf;
    + int i;
    +
    + rmi_dev = to_rmi_device(dev);
    + data = rmi_get_driverdata(rmi_dev);
    +
    + retval = sscanf(buf, "%x %u", &address, &bytes);
    + if (retval != 2) {
    + dev_err(dev, "Invalid input (code %d) for reg store: %s",
    + retval, buf);
    + return -EINVAL;
    + }
    + if (address < 0 || address > 0xFFFF) {
    + dev_err(dev, "Invalid address for reg store '%#06x'.\n",
    + address);
    + return -EINVAL;
    + }
    + if (bytes < 0 || bytes >= sizeof(readbuf) || address+bytes > 65535) {
    + dev_err(dev, "Invalid byte count for reg store '%d'.\n",
    + bytes);
    + return -EINVAL;
    + }
    +
    + retval = rmi_read_block(rmi_dev, address, readbuf, bytes);
    + if (retval != bytes) {
    + dev_err(dev, "Failed to read %d registers at %#06x, code %d.\n",
    + bytes, address, retval);
    + return retval;
    + }
    +
    + dev_info(dev, "Reading %d bytes from %#06x.\n", bytes, address);
    + for (i = 0; i < bytes; i++) {
    + retval = snprintf(bufptr, 4, "%02X ", readbuf[i]);
    + if (retval < 0) {
    + dev_err(dev, "Failed to format string. Code: %d",
    + retval);
    + return retval;
    + }
    + bufptr += retval;
    + }
    + dev_info(dev, "%s\n", outbuf);
    +
    + return count;
    +}
    +#endif
    +
    +#if DELAY_DEBUG
    +static ssize_t rmi_delay_store(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + int retval;
    + struct rmi_device *rmi_dev;
    + struct rmi_device_platform_data *pdata;
    + unsigned int new_read_delay;
    + unsigned int new_write_delay;
    + unsigned int new_block_delay;
    + unsigned int new_pre_delay;
    + unsigned int new_post_delay;
    +
    + retval = sscanf(buf, "%u %u %u %u %u", &new_read_delay,
    + &new_write_delay, &new_block_delay,
    + &new_pre_delay, &new_post_delay);
    + if (retval != 5) {
    + dev_err(dev, "Incorrect number of values provided for delay.");
    + return -EINVAL;
    + }
    + if (new_read_delay < 0) {
    + dev_err(dev, "Byte delay must be positive microseconds.\n");
    + return -EINVAL;
    + }
    + if (new_write_delay < 0) {
    + dev_err(dev, "Write delay must be positive microseconds.\n");
    + return -EINVAL;
    + }
    + if (new_block_delay < 0) {
    + dev_err(dev, "Block delay must be positive microseconds.\n");
    + return -EINVAL;
    + }
    + if (new_pre_delay < 0) {
    + dev_err(dev,
    + "Pre-transfer delay must be positive microseconds.\n");
    + return -EINVAL;
    + }
    + if (new_post_delay < 0) {
    + dev_err(dev,
    + "Post-transfer delay must be positive microseconds.\n");
    + return -EINVAL;
    + }
    +
    + rmi_dev = to_rmi_device(dev);
    + pdata = rmi_dev->phys->dev->platform_data;
    +
    + dev_info(dev, "Setting delays to %u %u %u %u %u.\n", new_read_delay,
    + new_write_delay, new_block_delay, new_pre_delay,
    + new_post_delay);
    + pdata->spi_data.read_delay_us = new_read_delay;
    + pdata->spi_data.write_delay_us = new_write_delay;
    + pdata->spi_data.block_delay_us = new_block_delay;
    + pdata->spi_data.pre_delay_us = new_pre_delay;
    + pdata->spi_data.post_delay_us = new_post_delay;
    +
    + return count;
    +}
    +
    +static ssize_t rmi_delay_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + struct rmi_device *rmi_dev;
    + struct rmi_device_platform_data *pdata;
    +
    + rmi_dev = to_rmi_device(dev);
    + pdata = rmi_dev->phys->dev->platform_data;
    +
    + return snprintf(buf, PAGE_SIZE, "%d %d %d %d %d\n",
    + pdata->spi_data.read_delay_us, pdata->spi_data.write_delay_us,
    + pdata->spi_data.block_delay_us,
    + pdata->spi_data.pre_delay_us, pdata->spi_data.post_delay_us);
    +}
    +#endif
    +
    +static ssize_t rmi_driver_phys_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + struct rmi_device *rmi_dev;
    + struct rmi_phys_info *info;
    +
    + rmi_dev = to_rmi_device(dev);
    + info = &rmi_dev->phys->info;
    +
    + return snprintf(buf, PAGE_SIZE, "%-5s %ld %ld %ld %ld %ld %ld %ld\n",
    + info->proto ? info->proto : "unk",
    + info->tx_count, info->tx_bytes, info->tx_errs,
    + info->rx_count, info->rx_bytes, info->rx_errs,
    + info->attn_count);
    +}
    +
    +static ssize_t rmi_driver_version_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + return snprintf(buf, PAGE_SIZE, "%s\n",
    + RMI_DRIVER_VERSION_STRING);
    +}
    +
    +static int __init rmi_driver_init(void)
    +{
    + return rmi_register_driver(&sensor_driver);
    +}
    +
    +static void __exit rmi_driver_exit(void)
    +{
    + rmi_unregister_driver(&sensor_driver);
    +}
    +
    +module_init(rmi_driver_init);
    +module_exit(rmi_driver_exit);
    +
    +MODULE_AUTHOR("Christopher Heiny <cheiny@synaptics.com");
    +MODULE_DESCRIPTION("RMI generic driver");
    +MODULE_LICENSE("GPL");
    diff --git a/drivers/input/rmi4/rmi_driver.h b/drivers/input/rmi4/rmi_driver.h
    new file mode 100644
    index 0000000..dc0d9c5
    --- /dev/null
    +++ b/drivers/input/rmi4/rmi_driver.h
    @@ -0,0 +1,97 @@
    +/*
    + * Copyright (c) 2011 Synaptics Incorporated
    + * Copyright (c) 2011 Unixphere
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + *
    + * 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.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program; if not, write to the Free Software
    + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    + */
    +#ifndef _RMI_DRIVER_H
    +#define _RMI_DRIVER_H
    +
    +#define RMI_DRIVER_MAJOR_VERSION 1
    +#define RMI_DRIVER_MINOR_VERSION 3
    +#define RMI_DRIVER_SUB_MINOR_VERSION 0
    +
    +/* TODO: Figure out some way to construct this string in the define macro
    + * using the values defined above.
    + */
    +#define RMI_DRIVER_VERSION_STRING "1.3.0"
    +
    +
    +#define RMI_PRODUCT_ID_LENGTH 10
    +#define RMI_PRODUCT_INFO_LENGTH 2
    +#define RMI_DATE_CODE_LENGTH 3
    +
    +struct rmi_driver_data {
    + struct rmi_function_container rmi_functions;
    +
    + struct rmi_function_container *f01_container;
    +
    + int num_of_irq_regs;
    + u8 *current_irq_mask;
    + u8 *irq_mask_store;
    + bool irq_stored;
    + struct mutex irq_mutex;
    + struct lock_class_key irq_key;
    + struct mutex pdt_mutex;
    +
    + unsigned char pdt_props;
    + unsigned char bsr;
    + bool enabled;
    +
    + u8 manufacturer_id;
    + /* product id + null termination */
    + u8 product_id[RMI_PRODUCT_ID_LENGTH + 1];
    +
    +#ifdef CONFIG_PM
    + bool suspended;
    + struct mutex suspend_mutex;
    +
    + void *pm_data;
    + int (*pre_suspend) (const void *pm_data);
    + int (*post_resume) (const void *pm_data);
    +#endif
    +
    + void *data;
    +};
    +
    +struct pdt_entry {
    + u8 query_base_addr:8;
    + u8 command_base_addr:8;
    + u8 control_base_addr:8;
    + u8 data_base_addr:8;
    + u8 interrupt_source_count:3;
    + u8 bits3and4:2;
    + u8 function_version:2;
    + u8 bit7:1;
    + u8 function_number:8;
    +};
    +
    +int rmi_driver_f01_init(struct rmi_device *rmi_dev);
    +
    +static inline void copy_pdt_entry_to_fd(struct pdt_entry *pdt,
    + struct rmi_function_descriptor *fd,
    + u16 page_start)
    +{
    + fd->query_base_addr = pdt->query_base_addr + page_start;
    + fd->command_base_addr = pdt->command_base_addr + page_start;
    + fd->control_base_addr = pdt->control_base_addr + page_start;
    + fd->data_base_addr = pdt->data_base_addr + page_start;
    + fd->function_number = pdt->function_number;
    + fd->interrupt_source_count = pdt->interrupt_source_count;
    + fd->function_version = pdt->function_version;
    +}
    +
    +#endif
    +

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     \ /
      Last update: 2011-12-22 03:23    [W:0.157 / U:0.340 seconds]
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