+++ /dev/null
-/*
- * clearpad_tm1217.c - Touch Screen driver for Synaptics Clearpad
- * TM1217 controller
- *
- * Copyright (C) 2008 Intel Corp
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * 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; version 2 of the License.
- *
- * 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; ifnot, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
- *
- * Questions/Comments/Bug fixes to Ramesh Agarwal (ramesh.agarwal@intel.com)
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/input.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/i2c.h>
-#include <linux/timer.h>
-#include <linux/gpio.h>
-#include <linux/hrtimer.h>
-#include <linux/kthread.h>
-#include <linux/delay.h>
-#include <linux/slab.h>
-#include "cp_tm1217.h"
-
-#define CPTM1217_DEVICE_NAME "cptm1217"
-#define CPTM1217_DRIVER_NAME CPTM1217_DEVICE_NAME
-
-#define MAX_TOUCH_SUPPORTED 2
-#define TOUCH_SUPPORTED 1
-#define SAMPLING_FREQ 80 /* Frequency in HZ */
-#define DELAY_BTWIN_SAMPLE (1000 / SAMPLING_FREQ)
-#define WAIT_FOR_RESPONSE 5 /* 5msec just works */
-#define MAX_RETRIES 5 /* As above */
-#define INCREMENTAL_DELAY 5 /* As above */
-
-/* Regster Definitions */
-#define TMA1217_DEV_STATUS 0x13 /* Device Status */
-#define TMA1217_INT_STATUS 0x14 /* Interrupt Status */
-
-/* Controller can detect up to 2 possible finger touches.
- * Each finger touch provides 12 bit X Y co-ordinates, the values are split
- * across 2 registers, and an 8 bit Z value */
-#define TMA1217_FINGER_STATE 0x18 /* Finger State */
-#define TMA1217_FINGER1_X_HIGHER8 0x19 /* Higher 8 bit of X coordinate */
-#define TMA1217_FINGER1_Y_HIGHER8 0x1A /* Higher 8 bit of Y coordinate */
-#define TMA1217_FINGER1_XY_LOWER4 0x1B /* Lower 4 bits of X and Y */
-#define TMA1217_FINGER1_Z_VALUE 0x1D /* 8 bit Z value for finger 1 */
-#define TMA1217_FINGER2_X_HIGHER8 0x1E /* Higher 8 bit of X coordinate */
-#define TMA1217_FINGER2_Y_HIGHER8 0x1F /* Higher 8 bit of Y coordinate */
-#define TMA1217_FINGER2_XY_LOWER4 0x20 /* Lower 4 bits of X and Y */
-#define TMA1217_FINGER2_Z_VALUE 0x22 /* 8 bit Z value for finger 2 */
-#define TMA1217_DEVICE_CTRL 0x23 /* Device Control */
-#define TMA1217_INTERRUPT_ENABLE 0x24 /* Interrupt Enable */
-#define TMA1217_REPORT_MODE 0x2B /* Reporting Mode */
-#define TMA1217_MAX_X_LOWER8 0x31 /* Bit 0-7 for Max X */
-#define TMA1217_MAX_X_HIGHER4 0x32 /* Bit 8-11 for Max X */
-#define TMA1217_MAX_Y_LOWER8 0x33 /* Bit 0-7 for Max Y */
-#define TMA1217_MAX_Y_HIGHER4 0x34 /* Bit 8-11 for Max Y */
-#define TMA1217_DEVICE_CMD_RESET 0x67 /* Device CMD reg for reset */
-#define TMA1217_DEVICE_CMD_REZERO 0x69 /* Device CMD reg for rezero */
-
-#define TMA1217_MANUFACTURER_ID 0x73 /* Manufacturer Id */
-#define TMA1217_PRODUCT_FAMILY 0x75 /* Product Family */
-#define TMA1217_FIRMWARE_REVISION 0x76 /* Firmware Revision */
-#define TMA1217_SERIAL_NO_HIGH 0x7C /* Bit 8-15 of device serial no. */
-#define TMA1217_SERIAL_NO_LOW 0x7D /* Bit 0-7 of device serial no. */
-#define TMA1217_PRODUCT_ID_START 0x7E /* Start address for 10 byte ID */
-#define TMA1217_DEVICE_CAPABILITY 0x8B /* Reporting capability */
-
-
-/*
- * The touch position structure.
- */
-struct touch_state {
- int x;
- int y;
- bool button;
-};
-
-/* Device Specific info given by the controller */
-struct cp_dev_info {
- u16 maxX;
- u16 maxY;
-};
-
-/* Vendor related info given by the controller */
-struct cp_vendor_info {
- u8 vendor_id;
- u8 product_family;
- u8 firmware_rev;
- u16 serial_no;
-};
-
-/*
- * Private structure to store the device details
- */
-struct cp_tm1217_device {
- struct i2c_client *client;
- struct device *dev;
- struct cp_vendor_info vinfo;
- struct cp_dev_info dinfo;
- struct input_dev_info {
- char phys[32];
- char name[128];
- struct input_dev *input;
- struct touch_state touch;
- } cp_input_info[MAX_TOUCH_SUPPORTED];
-
- int thread_running;
- struct mutex thread_mutex;
-
- int gpio;
-};
-
-
-/* The following functions are used to read/write registers on the device
- * as per the RMI prorocol. Technically, a page select should be written
- * before doing read/write but since the register offsets are below 0xFF
- * we can use the default value of page which is 0x00
- */
-static int cp_tm1217_read(struct cp_tm1217_device *ts,
- u8 *req, int size)
-{
- int i, retval;
-
- /* Send the address */
- retval = i2c_master_send(ts->client, &req[0], 1);
- if (retval != 1) {
- dev_err(ts->dev, "cp_tm1217: I2C send failed\n");
- return retval;
- }
- msleep(WAIT_FOR_RESPONSE);
- for (i = 0; i < MAX_RETRIES; i++) {
- retval = i2c_master_recv(ts->client, &req[1], size);
- if (retval == size)
- break;
-
- msleep(INCREMENTAL_DELAY);
- dev_dbg(ts->dev, "cp_tm1217: Retry count is %d\n", i);
- }
- if (retval != size)
- dev_err(ts->dev, "cp_tm1217: Read from device failed\n");
-
- return retval;
-}
-
-static int cp_tm1217_write(struct cp_tm1217_device *ts,
- u8 *req, int size)
-{
- int retval;
-
- /* Send the address and the data to be written */
- retval = i2c_master_send(ts->client, &req[0], size + 1);
- if (retval != size + 1) {
- dev_err(ts->dev, "cp_tm1217: I2C write failed: %d\n", retval);
- return retval;
- }
- /* Wait for the write to complete. TBD why this is required */
- msleep(WAIT_FOR_RESPONSE);
-
- return size;
-}
-
-static int cp_tm1217_mask_interrupt(struct cp_tm1217_device *ts)
-{
- u8 req[2];
- int retval;
-
- req[0] = TMA1217_INTERRUPT_ENABLE;
- req[1] = 0x0;
- retval = cp_tm1217_write(ts, req, 1);
- if (retval != 1)
- return -EIO;
-
- return 0;
-}
-
-static int cp_tm1217_unmask_interrupt(struct cp_tm1217_device *ts)
-{
- u8 req[2];
- int retval;
-
- req[0] = TMA1217_INTERRUPT_ENABLE;
- req[1] = 0xa;
- retval = cp_tm1217_write(ts, req, 1);
- if (retval != 1)
- return -EIO;
-
- return 0;
-}
-
-static void process_touch(struct cp_tm1217_device *ts, int index)
-{
- int retval;
- struct input_dev_info *input_info =
- (struct input_dev_info *)&ts->cp_input_info[index];
- u8 xy_data[6];
-
- if (index == 0)
- xy_data[0] = TMA1217_FINGER1_X_HIGHER8;
- else
- xy_data[0] = TMA1217_FINGER2_X_HIGHER8;
-
- retval = cp_tm1217_read(ts, xy_data, 5);
- if (retval < 5) {
- dev_err(ts->dev, "cp_tm1217: XY read from device failed\n");
- return;
- }
-
- /* Note: Currently not using the Z values but may be requried in
- the future. */
- input_info->touch.x = (xy_data[1] << 4)
- | (xy_data[3] & 0x0F);
- input_info->touch.y = (xy_data[2] << 4)
- | ((xy_data[3] & 0xF0) >> 4);
- input_report_abs(input_info->input, ABS_X, input_info->touch.x);
- input_report_abs(input_info->input, ABS_Y, input_info->touch.y);
- input_sync(input_info->input);
-}
-
-static void cp_tm1217_get_data(struct cp_tm1217_device *ts)
-{
- u8 req[2];
- int retval, i, finger_touched = 0;
-
- do {
- req[0] = TMA1217_FINGER_STATE;
- retval = cp_tm1217_read(ts, req, 1);
- if (retval != 1) {
- dev_err(ts->dev,
- "cp_tm1217: Read from device failed\n");
- continue;
- }
- finger_touched = 0;
- /* Start sampling until the pressure is below
- threshold */
- for (i = 0; i < TOUCH_SUPPORTED; i++) {
- if (req[1] & 0x3) {
- finger_touched++;
- if (ts->cp_input_info[i].touch.button == 0) {
- /* send the button touch event */
- input_report_key(
- ts->cp_input_info[i].input,
- BTN_TOUCH, 1);
- ts->cp_input_info[i].touch.button = 1;
- }
- process_touch(ts, i);
- } else {
- if (ts->cp_input_info[i].touch.button == 1) {
- /* send the button release event */
- input_report_key(
- ts->cp_input_info[i].input,
- BTN_TOUCH, 0);
- input_sync(ts->cp_input_info[i].input);
- ts->cp_input_info[i].touch.button = 0;
- }
- }
- req[1] = req[1] >> 2;
- }
- msleep(DELAY_BTWIN_SAMPLE);
- } while (finger_touched > 0);
-}
-
-static irqreturn_t cp_tm1217_sample_thread(int irq, void *handle)
-{
- struct cp_tm1217_device *ts = handle;
- u8 req[2];
- int retval;
-
- /* Chedk if another thread is already running */
- mutex_lock(&ts->thread_mutex);
- if (ts->thread_running == 1) {
- mutex_unlock(&ts->thread_mutex);
- return IRQ_HANDLED;
- }
-
- ts->thread_running = 1;
- mutex_unlock(&ts->thread_mutex);
-
- /* Mask the interrupts */
- retval = cp_tm1217_mask_interrupt(ts);
-
- /* Read the Interrupt Status register to find the cause of the
- Interrupt */
- req[0] = TMA1217_INT_STATUS;
- retval = cp_tm1217_read(ts, req, 1);
- if (retval != 1)
- goto exit_thread;
-
- if (!(req[1] & 0x8))
- goto exit_thread;
-
- cp_tm1217_get_data(ts);
-
-exit_thread:
- /* Unmask the interrupts before going to sleep */
- retval = cp_tm1217_unmask_interrupt(ts);
-
- mutex_lock(&ts->thread_mutex);
- ts->thread_running = 0;
- mutex_unlock(&ts->thread_mutex);
-
- return IRQ_HANDLED;
-}
-
-static int cp_tm1217_init_data(struct cp_tm1217_device *ts)
-{
- int retval;
- u8 req[2];
-
- /* Read the vendor id/ fw revision etc. Ignoring return check as this
- is non critical info */
- req[0] = TMA1217_MANUFACTURER_ID;
- retval = cp_tm1217_read(ts, req, 1);
- ts->vinfo.vendor_id = req[1];
-
- req[0] = TMA1217_PRODUCT_FAMILY;
- retval = cp_tm1217_read(ts, req, 1);
- ts->vinfo.product_family = req[1];
-
- req[0] = TMA1217_FIRMWARE_REVISION;
- retval = cp_tm1217_read(ts, req, 1);
- ts->vinfo.firmware_rev = req[1];
-
- req[0] = TMA1217_SERIAL_NO_HIGH;
- retval = cp_tm1217_read(ts, req, 1);
- ts->vinfo.serial_no = (req[1] << 8);
-
- req[0] = TMA1217_SERIAL_NO_LOW;
- retval = cp_tm1217_read(ts, req, 1);
- ts->vinfo.serial_no = ts->vinfo.serial_no | req[1];
-
- req[0] = TMA1217_MAX_X_HIGHER4;
- retval = cp_tm1217_read(ts, req, 1);
- ts->dinfo.maxX = (req[1] & 0xF) << 8;
-
- req[0] = TMA1217_MAX_X_LOWER8;
- retval = cp_tm1217_read(ts, req, 1);
- ts->dinfo.maxX = ts->dinfo.maxX | req[1];
-
- req[0] = TMA1217_MAX_Y_HIGHER4;
- retval = cp_tm1217_read(ts, req, 1);
- ts->dinfo.maxY = (req[1] & 0xF) << 8;
-
- req[0] = TMA1217_MAX_Y_LOWER8;
- retval = cp_tm1217_read(ts, req, 1);
- ts->dinfo.maxY = ts->dinfo.maxY | req[1];
-
- return 0;
-
-}
-
-/*
- * Set up a GPIO for use as the interrupt. We can't simply do this at
- * boot time because the GPIO drivers themselves may not be around at
- * boot/firmware set up time to do the work. Instead defer it to driver
- * detection.
- */
-
-static int cp_tm1217_setup_gpio_irq(struct cp_tm1217_device *ts)
-{
- int retval;
-
- /* Hook up the irq handler */
- retval = gpio_request(ts->gpio, "cp_tm1217_touch");
- if (retval < 0) {
- dev_err(ts->dev, "cp_tm1217: GPIO request failed error %d\n",
- retval);
- return retval;
- }
-
- retval = gpio_direction_input(ts->gpio);
- if (retval < 0) {
- dev_err(ts->dev,
- "cp_tm1217: GPIO direction configuration failed, error %d\n",
- retval);
- gpio_free(ts->gpio);
- return retval;
- }
-
- retval = gpio_to_irq(ts->gpio);
- if (retval < 0) {
- dev_err(ts->dev,
- "cp_tm1217: GPIO to IRQ failed, error %d\n", retval);
- gpio_free(ts->gpio);
- }
- dev_dbg(ts->dev,
- "cp_tm1217: Got IRQ number is %d for GPIO %d\n",
- retval, ts->gpio);
- return retval;
-}
-
-static int cp_tm1217_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
-{
- struct cp_tm1217_device *ts;
- struct input_dev *input_dev;
- struct input_dev_info *input_info;
- struct cp_tm1217_platform_data *pdata;
- u8 req[2];
- int i, retval;
-
- /* No pdata is fine - we then use "normal" IRQ mode */
-
- pdata = client->dev.platform_data;
-
- ts = kzalloc(sizeof(struct cp_tm1217_device), GFP_KERNEL);
- if (!ts)
- return -ENOMEM;
-
- ts->client = client;
- ts->dev = &client->dev;
- i2c_set_clientdata(client, ts);
-
- ts->thread_running = 0;
- mutex_init(&ts->thread_mutex);
-
- /* Reset the Controller */
- req[0] = TMA1217_DEVICE_CMD_RESET;
- req[1] = 0x1;
- retval = cp_tm1217_write(ts, req, 1);
- if (retval != 1) {
- dev_err(ts->dev, "cp_tm1217: Controller reset failed\n");
- kfree(ts);
- return -EIO;
- }
-
- /* Clear up the interrupt status from reset. */
- req[0] = TMA1217_INT_STATUS;
- retval = cp_tm1217_read(ts, req, 1);
-
- /* Mask all the interrupts */
- retval = cp_tm1217_mask_interrupt(ts);
- if (retval) {
- dev_err(ts->dev, "failed to mask interrupts, error: %d\n",
- retval);
- kfree(ts);
- return retval;
- }
-
- /* Read the controller information */
- cp_tm1217_init_data(ts);
-
- /* The following code will register multiple event devices when
- multi-pointer is enabled, the code has not been tested
- with MPX */
- for (i = 0; i < TOUCH_SUPPORTED; i++) {
- input_dev = input_allocate_device();
- if (input_dev == NULL) {
- retval = -ENOMEM;
- goto fail;
- }
- input_info = &ts->cp_input_info[i];
- snprintf(input_info->name, sizeof(input_info->name),
- "cp_tm1217_touchscreen_%d", i);
- input_dev->name = input_info->name;
- snprintf(input_info->phys, sizeof(input_info->phys),
- "%s/input%d", dev_name(&client->dev), i);
-
- input_dev->phys = input_info->phys;
- input_dev->id.bustype = BUS_I2C;
-
- input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
- input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
-
- input_set_abs_params(input_dev, ABS_X, 0, ts->dinfo.maxX, 0, 0);
- input_set_abs_params(input_dev, ABS_Y, 0, ts->dinfo.maxY, 0, 0);
-
- retval = input_register_device(input_dev);
- if (retval) {
- dev_err(ts->dev,
- "Input dev registration failed for %s\n",
- input_dev->name);
- input_free_device(input_dev);
- goto fail;
- }
- input_info->input = input_dev;
- }
-
- /* Setup the reporting mode to send an interrupt only when
- finger arrives or departs. */
- req[0] = TMA1217_REPORT_MODE;
- req[1] = 0x02;
- retval = cp_tm1217_write(ts, req, 1);
-
- /* Setup the device to no sleep mode for now and make it configured */
- req[0] = TMA1217_DEVICE_CTRL;
- req[1] = 0x84;
- retval = cp_tm1217_write(ts, req, 1);
-
- /* Check for the status of the device */
- req[0] = TMA1217_DEV_STATUS;
- retval = cp_tm1217_read(ts, req, 1);
- if (req[1] != 0) {
- dev_err(ts->dev,
- "cp_tm1217: Device Status 0x%x != 0: config failed\n",
- req[1]);
-
- retval = -EIO;
- goto fail;
- }
-
- if (pdata && pdata->gpio) {
- ts->gpio = pdata->gpio;
- retval = cp_tm1217_setup_gpio_irq(ts);
- } else
- retval = client->irq;
-
- if (retval < 0) {
- dev_err(ts->dev, "cp_tm1217: GPIO request failed error %d\n",
- retval);
- goto fail;
- }
-
- client->irq = retval;
-
-
- retval = request_threaded_irq(client->irq,
- NULL, cp_tm1217_sample_thread,
- IRQF_TRIGGER_FALLING, "cp_tm1217_touch", ts);
- if (retval < 0) {
- dev_err(ts->dev, "cp_tm1217: Request IRQ error %d\n", retval);
- goto fail_gpio;
- }
-
- /* Unmask the interrupts */
- retval = cp_tm1217_unmask_interrupt(ts);
- if (retval == 0)
- return 0;
-
- free_irq(client->irq, ts);
-fail_gpio:
- if (ts->gpio)
- gpio_free(ts->gpio);
-fail:
- /* Clean up before returning failure */
- for (i = 0; i < TOUCH_SUPPORTED; i++) {
- if (ts->cp_input_info[i].input)
- input_unregister_device(ts->cp_input_info[i].input);
- }
- kfree(ts);
- return retval;
-
-}
-
-#ifdef CONFIG_PM_SLEEP
-
-/*
- * cp_tm1217 suspend
- *
- */
-static int cp_tm1217_suspend(struct device *dev)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct cp_tm1217_device *ts = i2c_get_clientdata(client);
- u8 req[2];
- int retval;
-
- /* Put the controller to sleep */
- req[0] = TMA1217_DEVICE_CTRL;
- retval = cp_tm1217_read(ts, req, 1);
- req[1] = (req[1] & 0xF8) | 0x1;
- retval = cp_tm1217_write(ts, req, 1);
-
- if (device_may_wakeup(&client->dev))
- enable_irq_wake(client->irq);
-
- return 0;
-}
-
-/*
- * cp_tm1217_resume
- *
- */
-static int cp_tm1217_resume(struct device *dev)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct cp_tm1217_device *ts = i2c_get_clientdata(client);
- u8 req[2];
- int retval;
-
- /* Take the controller out of sleep */
- req[0] = TMA1217_DEVICE_CTRL;
- retval = cp_tm1217_read(ts, req, 1);
- req[1] = (req[1] & 0xF8) | 0x4;
- retval = cp_tm1217_write(ts, req, 1);
-
- /* Restore the register settings sinc the power to the
- could have been cut off */
-
- /* Setup the reporting mode to send an interrupt only when
- finger arrives or departs. */
- req[0] = TMA1217_REPORT_MODE;
- req[1] = 0x02;
- retval = cp_tm1217_write(ts, req, 1);
-
- /* Setup the device to no sleep mode for now and make it configured */
- req[0] = TMA1217_DEVICE_CTRL;
- req[1] = 0x84;
- retval = cp_tm1217_write(ts, req, 1);
-
- /* Setup the interrupt mask */
- retval = cp_tm1217_unmask_interrupt(ts);
-
- if (device_may_wakeup(&client->dev))
- disable_irq_wake(client->irq);
-
- return 0;
-}
-
-#endif
-
-static SIMPLE_DEV_PM_OPS(cp_tm1217_pm_ops, cp_tm1217_suspend,
- cp_tm1217_resume);
-
-/*
- * cp_tm1217_remove
- *
- */
-static int cp_tm1217_remove(struct i2c_client *client)
-{
- struct cp_tm1217_device *ts = i2c_get_clientdata(client);
- int i;
-
- free_irq(client->irq, ts);
- if (ts->gpio)
- gpio_free(ts->gpio);
- for (i = 0; i < TOUCH_SUPPORTED; i++)
- input_unregister_device(ts->cp_input_info[i].input);
- kfree(ts);
- return 0;
-}
-
-static struct i2c_device_id cp_tm1217_idtable[] = {
- { CPTM1217_DEVICE_NAME, 0 },
- { }
-};
-
-MODULE_DEVICE_TABLE(i2c, cp_tm1217_idtable);
-
-static struct i2c_driver cp_tm1217_driver = {
- .driver = {
- .owner = THIS_MODULE,
- .name = CPTM1217_DRIVER_NAME,
- .pm = &cp_tm1217_pm_ops,
- },
- .id_table = cp_tm1217_idtable,
- .probe = cp_tm1217_probe,
- .remove = cp_tm1217_remove,
-};
-
-module_i2c_driver(cp_tm1217_driver);
-
-MODULE_AUTHOR("Ramesh Agarwal <ramesh.agarwal@intel.com>");
-MODULE_DESCRIPTION("Synaptics TM1217 TouchScreen Driver");
-MODULE_LICENSE("GPL v2");
projects / karo-tx-linux.git / commitdiff