diff options
Diffstat (limited to 'drivers/input/touchscreen/synaptics_dsx_rmi_dev.c')
| -rw-r--r-- | drivers/input/touchscreen/synaptics_dsx_rmi_dev.c | 757 |
1 files changed, 757 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/synaptics_dsx_rmi_dev.c b/drivers/input/touchscreen/synaptics_dsx_rmi_dev.c new file mode 100644 index 00000000..f10815c5 --- /dev/null +++ b/drivers/input/touchscreen/synaptics_dsx_rmi_dev.c @@ -0,0 +1,757 @@ +/* + * Synaptics DSX touchscreen driver + * + * Copyright (C) 2012 Synaptics Incorporated + * + * Copyright (C) 2012 Alexandra Chin <alexandra.chin@tw.synaptics.com> + * Copyright (C) 2012 Scott Lin <scott.lin@tw.synaptics.com> + * + * 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. + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/input.h> +#include <linux/gpio.h> +#include <linux/uaccess.h> +#include <linux/cdev.h> +#include <linux/input/synaptics_rmi_dsx.h> +#include "synaptics_dsx_i2c.h" + +#define CHAR_DEVICE_NAME "rmi" +#define DEVICE_CLASS_NAME "rmidev" +#define DEV_NUMBER 1 +#define REG_ADDR_LIMIT 0xFFFF + +static ssize_t rmidev_sysfs_data_show(struct file *data_file, + struct kobject *kobj, struct bin_attribute *attributes, + char *buf, loff_t pos, size_t count); + +static ssize_t rmidev_sysfs_data_store(struct file *data_file, + struct kobject *kobj, struct bin_attribute *attributes, + char *buf, loff_t pos, size_t count); + +static ssize_t rmidev_sysfs_open_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count); + +static ssize_t rmidev_sysfs_release_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count); + +static ssize_t rmidev_sysfs_address_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count); + +static ssize_t rmidev_sysfs_length_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count); + +static ssize_t rmidev_sysfs_attn_state_show(struct device *dev, + struct device_attribute *attr, char *buf); + +struct rmidev_handle { + dev_t dev_no; + unsigned short address; + unsigned int length; + struct device dev; + struct synaptics_rmi4_data *rmi4_data; + struct synaptics_rmi4_exp_fn_ptr *fn_ptr; + struct kobject *sysfs_dir; + void *data; +}; + +struct rmidev_data { + int ref_count; + struct cdev main_dev; + struct class *device_class; + struct mutex file_mutex; + struct rmidev_handle *rmi_dev; +}; + +static struct bin_attribute attr_data = { + .attr = { + .name = "data", + .mode = (S_IRUGO | S_IWUSR | S_IWGRP), + }, + .size = 0, + .read = rmidev_sysfs_data_show, + .write = rmidev_sysfs_data_store, +}; + +static struct device_attribute attrs[] = { + __ATTR(open, S_IWUSR | S_IWGRP, + synaptics_rmi4_show_error, + rmidev_sysfs_open_store), + __ATTR(release, S_IWUSR | S_IWGRP, + synaptics_rmi4_show_error, + rmidev_sysfs_release_store), + __ATTR(address, S_IWUSR | S_IWGRP, + synaptics_rmi4_show_error, + rmidev_sysfs_address_store), + __ATTR(length, S_IWUSR | S_IWGRP, + synaptics_rmi4_show_error, + rmidev_sysfs_length_store), + __ATTR(attn_state, S_IRUSR | S_IRGRP, + rmidev_sysfs_attn_state_show, + synaptics_rmi4_store_error), +}; + +static int rmidev_major_num; + +static struct class *rmidev_device_class; + +static struct rmidev_handle *rmidev; + +static struct completion remove_complete; + +static ssize_t rmidev_sysfs_data_show(struct file *data_file, + struct kobject *kobj, struct bin_attribute *attributes, + char *buf, loff_t pos, size_t count) +{ + int retval; + unsigned int data_length = rmidev->length; + + if (data_length > (REG_ADDR_LIMIT - rmidev->address)) + data_length = REG_ADDR_LIMIT - rmidev->address; + + if (count < data_length) { + dev_err(&rmidev->rmi4_data->i2c_client->dev, + "%s: Not enough space (%zu bytes) in buffer\n", + __func__, count); + return -EINVAL; + } + + if (data_length) { + retval = rmidev->fn_ptr->read(rmidev->rmi4_data, + rmidev->address, + (unsigned char *)buf, + data_length); + if (retval < 0) { + dev_err(&rmidev->rmi4_data->i2c_client->dev, + "%s: Failed to read data\n", + __func__); + return retval; + } + } else { + return -EINVAL; + } + + return data_length; +} + +static ssize_t rmidev_sysfs_data_store(struct file *data_file, + struct kobject *kobj, struct bin_attribute *attributes, + char *buf, loff_t pos, size_t count) +{ + int retval; + unsigned int data_length = rmidev->length; + + if (data_length > (REG_ADDR_LIMIT - rmidev->address)) + data_length = REG_ADDR_LIMIT - rmidev->address; + + if (data_length) { + retval = rmidev->fn_ptr->write(rmidev->rmi4_data, + rmidev->address, + (unsigned char *)buf, + data_length); + if (retval < 0) { + dev_err(&rmidev->rmi4_data->i2c_client->dev, + "%s: Failed to write data\n", + __func__); + return retval; + } + } else { + return -EINVAL; + } + + return count; +} + +static ssize_t rmidev_sysfs_open_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + unsigned int input; + + if (sscanf(buf, "%u", &input) != 1) + return -EINVAL; + + if (input != 1) + return -EINVAL; + + rmidev->fn_ptr->enable(rmidev->rmi4_data, false); + dev_dbg(&rmidev->rmi4_data->i2c_client->dev, + "%s: Attention interrupt disabled\n", + __func__); + + return count; +} + +static ssize_t rmidev_sysfs_release_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + unsigned int input; + + if (sscanf(buf, "%u", &input) != 1) + return -EINVAL; + + if (input != 1) + return -EINVAL; + + rmidev->fn_ptr->enable(rmidev->rmi4_data, true); + dev_dbg(&rmidev->rmi4_data->i2c_client->dev, + "%s: Attention interrupt enabled\n", + __func__); + + return count; +} + +static ssize_t rmidev_sysfs_address_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + unsigned int input; + + if (sscanf(buf, "%u", &input) != 1) + return -EINVAL; + + if (input > REG_ADDR_LIMIT) + return -EINVAL; + + rmidev->address = (unsigned short)input; + + return count; +} + +static ssize_t rmidev_sysfs_length_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + unsigned int input; + + if (sscanf(buf, "%u", &input) != 1) + return -EINVAL; + + if (input > REG_ADDR_LIMIT) + return -EINVAL; + + rmidev->length = input; + + return count; +} + +static ssize_t rmidev_sysfs_attn_state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int attn_state; + const struct synaptics_dsx_platform_data *platform_data = + rmidev->rmi4_data->board; + + attn_state = gpio_get_value(platform_data->irq_gpio); + + return snprintf(buf, PAGE_SIZE, "%u\n", attn_state); +} + +/* + * rmidev_llseek - used to set up register address + * + * @filp: file structure for seek + * @off: offset + * if whence == SEEK_SET, + * high 16 bits: page address + * low 16 bits: register address + * if whence == SEEK_CUR, + * offset from current position + * if whence == SEEK_END, + * offset from end position (0xFFFF) + * @whence: SEEK_SET, SEEK_CUR, or SEEK_END + */ +static loff_t rmidev_llseek(struct file *filp, loff_t off, int whence) +{ + loff_t newpos; + struct rmidev_data *dev_data = filp->private_data; + + if (IS_ERR(dev_data)) { + pr_err("%s: Pointer of char device data is invalid", __func__); + return -EBADF; + } + + mutex_lock(&(dev_data->file_mutex)); + + switch (whence) { + case SEEK_SET: + newpos = off; + break; + case SEEK_CUR: + newpos = filp->f_pos + off; + break; + case SEEK_END: + newpos = REG_ADDR_LIMIT + off; + break; + default: + newpos = -EINVAL; + goto clean_up; + } + + if (newpos < 0 || newpos > REG_ADDR_LIMIT) { + dev_err(&rmidev->rmi4_data->i2c_client->dev, + "%s: New position 0x%04x is invalid\n", + __func__, (unsigned int)newpos); + newpos = -EINVAL; + goto clean_up; + } + + filp->f_pos = newpos; + +clean_up: + mutex_unlock(&(dev_data->file_mutex)); + + return newpos; +} + +/* + * rmidev_read: - use to read data from rmi device + * + * @filp: file structure for read + * @buf: user space buffer pointer + * @count: number of bytes to read + * @f_pos: offset (starting register address) + */ +static ssize_t rmidev_read(struct file *filp, char __user *buf, + size_t count, loff_t *f_pos) +{ + ssize_t retval; + unsigned char tmpbuf[count + 1]; + struct rmidev_data *dev_data = filp->private_data; + + if (IS_ERR(dev_data)) { + pr_err("%s: Pointer of char device data is invalid", __func__); + return -EBADF; + } + + if (count == 0) + return 0; + + if (count > (REG_ADDR_LIMIT - *f_pos)) + count = REG_ADDR_LIMIT - *f_pos; + + mutex_lock(&(dev_data->file_mutex)); + + retval = rmidev->fn_ptr->read(rmidev->rmi4_data, + *f_pos, + tmpbuf, + count); + if (retval < 0) + goto clean_up; + + if (copy_to_user(buf, tmpbuf, count)) + retval = -EFAULT; + else + *f_pos += retval; + +clean_up: + mutex_unlock(&(dev_data->file_mutex)); + + return retval; +} + +/* + * rmidev_write: - used to write data to rmi device + * + * @filep: file structure for write + * @buf: user space buffer pointer + * @count: number of bytes to write + * @f_pos: offset (starting register address) + */ +static ssize_t rmidev_write(struct file *filp, const char __user *buf, + size_t count, loff_t *f_pos) +{ + ssize_t retval; + unsigned char tmpbuf[count + 1]; + struct rmidev_data *dev_data = filp->private_data; + + if (IS_ERR(dev_data)) { + pr_err("%s: Pointer of char device data is invalid", __func__); + return -EBADF; + } + + if (count == 0) + return 0; + + if (count > (REG_ADDR_LIMIT - *f_pos)) + count = REG_ADDR_LIMIT - *f_pos; + + if (copy_from_user(tmpbuf, buf, count)) + return -EFAULT; + + mutex_lock(&(dev_data->file_mutex)); + + retval = rmidev->fn_ptr->write(rmidev->rmi4_data, + *f_pos, + tmpbuf, + count); + if (retval >= 0) + *f_pos += retval; + + mutex_unlock(&(dev_data->file_mutex)); + + return retval; +} + +/* + * rmidev_open: enable access to rmi device + * @inp: inode struture + * @filp: file structure + */ +static int rmidev_open(struct inode *inp, struct file *filp) +{ + int retval = 0; + struct rmidev_data *dev_data = + container_of(inp->i_cdev, struct rmidev_data, main_dev); + + if (!dev_data) + return -EACCES; + + filp->private_data = dev_data; + + mutex_lock(&(dev_data->file_mutex)); + + rmidev->fn_ptr->enable(rmidev->rmi4_data, false); + dev_dbg(&rmidev->rmi4_data->i2c_client->dev, + "%s: Attention interrupt disabled\n", + __func__); + + if (dev_data->ref_count < 1) + dev_data->ref_count++; + else + retval = -EACCES; + + mutex_unlock(&(dev_data->file_mutex)); + + return retval; +} + +/* + * rmidev_release: - release access to rmi device + * @inp: inode structure + * @filp: file structure + */ +static int rmidev_release(struct inode *inp, struct file *filp) +{ + struct rmidev_data *dev_data = + container_of(inp->i_cdev, struct rmidev_data, main_dev); + + if (!dev_data) + return -EACCES; + + mutex_lock(&(dev_data->file_mutex)); + + dev_data->ref_count--; + if (dev_data->ref_count < 0) + dev_data->ref_count = 0; + + rmidev->fn_ptr->enable(rmidev->rmi4_data, true); + dev_dbg(&rmidev->rmi4_data->i2c_client->dev, + "%s: Attention interrupt enabled\n", + __func__); + + mutex_unlock(&(dev_data->file_mutex)); + + return 0; +} + +static const struct file_operations rmidev_fops = { + .owner = THIS_MODULE, + .llseek = rmidev_llseek, + .read = rmidev_read, + .write = rmidev_write, + .open = rmidev_open, + .release = rmidev_release, +}; + +static void rmidev_device_cleanup(struct rmidev_data *dev_data) +{ + dev_t devno; + + if (dev_data) { + devno = dev_data->main_dev.dev; + + if (dev_data->device_class) + device_destroy(dev_data->device_class, devno); + + cdev_del(&dev_data->main_dev); + + unregister_chrdev_region(devno, 1); + + dev_dbg(&rmidev->rmi4_data->i2c_client->dev, + "%s: rmidev device removed\n", + __func__); + } + + return; +} + +static char *rmi_char_devnode(struct device *dev, umode_t *mode) +{ + if (!mode) + return NULL; + + *mode = (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH); + + return kasprintf(GFP_KERNEL, "rmi/%s", dev_name(dev)); +} + +static int rmidev_create_device_class(void) +{ + rmidev_device_class = class_create(THIS_MODULE, DEVICE_CLASS_NAME); + + if (IS_ERR(rmidev_device_class)) { + pr_err("%s: Failed to create /dev/%s\n", + __func__, CHAR_DEVICE_NAME); + return -ENODEV; + } + + rmidev_device_class->devnode = rmi_char_devnode; + + return 0; +} + +static int rmidev_init_device(struct synaptics_rmi4_data *rmi4_data) +{ + int retval; + dev_t dev_no; + unsigned char attr_count; + struct rmidev_data *dev_data; + struct device *device_ptr; + + rmidev = kzalloc(sizeof(*rmidev), GFP_KERNEL); + if (!rmidev) { + dev_err(&rmi4_data->i2c_client->dev, + "%s: Failed to alloc mem for rmidev\n", + __func__); + retval = -ENOMEM; + goto err_rmidev; + } + + rmidev->fn_ptr = kzalloc(sizeof(*(rmidev->fn_ptr)), GFP_KERNEL); + if (!rmidev) { + dev_err(&rmi4_data->i2c_client->dev, + "%s: Failed to alloc mem for fn_ptr\n", + __func__); + retval = -ENOMEM; + goto err_fn_ptr; + } + + rmidev->fn_ptr->read = rmi4_data->i2c_read; + rmidev->fn_ptr->write = rmi4_data->i2c_write; + rmidev->fn_ptr->enable = rmi4_data->irq_enable; + rmidev->rmi4_data = rmi4_data; + + retval = rmidev_create_device_class(); + if (retval < 0) { + dev_err(&rmi4_data->i2c_client->dev, + "%s: Failed to create device class\n", + __func__); + goto err_device_class; + } + + if (rmidev_major_num) { + dev_no = MKDEV(rmidev_major_num, DEV_NUMBER); + retval = register_chrdev_region(dev_no, 1, CHAR_DEVICE_NAME); + } else { + retval = alloc_chrdev_region(&dev_no, 0, 1, CHAR_DEVICE_NAME); + if (retval < 0) { + dev_err(&rmi4_data->i2c_client->dev, + "%s: Failed to allocate char device region\n", + __func__); + goto err_device_region; + } + + rmidev_major_num = MAJOR(dev_no); + dev_dbg(&rmi4_data->i2c_client->dev, + "%s: Major number of rmidev = %d\n", + __func__, rmidev_major_num); + } + + dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL); + if (!dev_data) { + dev_err(&rmi4_data->i2c_client->dev, + "%s: Failed to alloc mem for dev_data\n", + __func__); + retval = -ENOMEM; + goto err_dev_data; + } + + mutex_init(&dev_data->file_mutex); + dev_data->rmi_dev = rmidev; + rmidev->data = dev_data; + + cdev_init(&dev_data->main_dev, &rmidev_fops); + + retval = cdev_add(&dev_data->main_dev, dev_no, 1); + if (retval < 0) { + dev_err(&rmi4_data->i2c_client->dev, + "%s: Failed to add rmi char device\n", + __func__); + goto err_char_device; + } + + dev_set_name(&rmidev->dev, "rmidev%d", MINOR(dev_no)); + dev_data->device_class = rmidev_device_class; + + device_ptr = device_create(dev_data->device_class, NULL, dev_no, + NULL, CHAR_DEVICE_NAME"%d", MINOR(dev_no)); + if (IS_ERR(device_ptr)) { + dev_err(&rmi4_data->i2c_client->dev, + "%s: Failed to create rmi char device\n", + __func__); + retval = -ENODEV; + goto err_char_device; + } + + retval = gpio_export(rmi4_data->board->irq_gpio, false); + if (retval < 0) { + dev_err(&rmi4_data->i2c_client->dev, + "%s: Failed to export attention gpio\n", + __func__); + } else { + retval = gpio_export_link(&(rmi4_data->i2c_client->dev), + "attn", rmi4_data->board->irq_gpio); + if (retval < 0) { + dev_err(&rmi4_data->i2c_client->dev, + "%s Failed to create gpio symlink\n", + __func__); + } else { + dev_dbg(&rmi4_data->i2c_client->dev, + "%s: Exported attention gpio %d\n", + __func__, rmi4_data->board->irq_gpio); + } + } + + rmidev->sysfs_dir = kobject_create_and_add("rmidev", + &rmi4_data->i2c_client->dev.kobj); + if (!rmidev->sysfs_dir) { + dev_err(&rmi4_data->i2c_client->dev, + "%s: Failed to create sysfs directory\n", + __func__); + goto err_sysfs_dir; + } + + retval = sysfs_create_bin_file(rmidev->sysfs_dir, + &attr_data); + if (retval < 0) { + dev_err(&rmi4_data->i2c_client->dev, + "%s: Failed to create sysfs bin file\n", + __func__); + goto err_sysfs_bin; + } + + for (attr_count = 0; attr_count < ARRAY_SIZE(attrs); attr_count++) { + retval = sysfs_create_file(rmidev->sysfs_dir, + &attrs[attr_count].attr); + if (retval < 0) { + dev_err(&rmi4_data->i2c_client->dev, + "%s: Failed to create sysfs attributes\n", + __func__); + retval = -ENODEV; + goto err_sysfs_attrs; + } + } + + return 0; + +err_sysfs_attrs: + for (attr_count--; attr_count >= 0; attr_count--) + sysfs_remove_file(rmidev->sysfs_dir, &attrs[attr_count].attr); + + sysfs_remove_bin_file(rmidev->sysfs_dir, &attr_data); + +err_sysfs_bin: + kobject_put(rmidev->sysfs_dir); + +err_sysfs_dir: +err_char_device: + rmidev_device_cleanup(dev_data); + kfree(dev_data); + +err_dev_data: + unregister_chrdev_region(dev_no, 1); + +err_device_region: + class_destroy(rmidev_device_class); + +err_device_class: + kfree(rmidev->fn_ptr); + +err_fn_ptr: + kfree(rmidev); + +err_rmidev: + return retval; +} + +static void rmidev_remove_device(struct synaptics_rmi4_data *rmi4_data) +{ + unsigned char attr_count; + struct rmidev_data *dev_data; + + if (!rmidev) + return; + + for (attr_count = 0; attr_count < ARRAY_SIZE(attrs); attr_count++) + sysfs_remove_file(rmidev->sysfs_dir, &attrs[attr_count].attr); + + sysfs_remove_bin_file(rmidev->sysfs_dir, &attr_data); + + kobject_put(rmidev->sysfs_dir); + + dev_data = rmidev->data; + if (dev_data) { + rmidev_device_cleanup(dev_data); + kfree(dev_data); + } + + unregister_chrdev_region(rmidev->dev_no, 1); + + class_destroy(rmidev_device_class); + + kfree(rmidev->fn_ptr); + kfree(rmidev); + + complete(&remove_complete); + + return; +} + +static int __init rmidev_module_init(void) +{ + synaptics_rmi4_new_function(RMI_DEV, true, + rmidev_init_device, + rmidev_remove_device, + NULL, IC_MODE_ANY); + return 0; +} + +static void __exit rmidev_module_exit(void) +{ + init_completion(&remove_complete); + synaptics_rmi4_new_function(RMI_DEV, false, + rmidev_init_device, + rmidev_remove_device, + NULL, IC_MODE_ANY); + wait_for_completion(&remove_complete); + return; +} + +module_init(rmidev_module_init); +module_exit(rmidev_module_exit); + +MODULE_AUTHOR("Synaptics, Inc."); +MODULE_DESCRIPTION("Synaptics DSX RMI Dev Module"); +MODULE_LICENSE("GPL v2"); +MODULE_VERSION(SYNAPTICS_DSX_DRIVER_VERSION); |