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