474 lines
12 KiB
C
Executable File
474 lines
12 KiB
C
Executable File
/*
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* drivers/input/touchscreen/ak4183.c
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*
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* Copyright (c) 2010 SashaG <...>
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* Copyright (c) 2010 Fear <angell@angellfear.ru>
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*
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* Using code from:
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* tsc2007.c
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*
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* Copyright (c) 2008 MtekVision Co., Ltd.
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* Copyright (c) 2005 David Brownell
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* Copyright (c) 2006 Nokia Corporation
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* - corgi_ts.c
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* Copyright (C) 2004-2005 Richard Purdie
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* - omap_ts.[hc], ads7846.h, ts_osk.c
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* Copyright (C) 2002 MontaVista Software
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* Copyright (C) 2004 Texas Instruments
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* Copyright (C) 2005 Dirk Behme
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/delay.h>
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#include <linux/i2c/ak4183.h>
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#define TS_POLL_DELAY 10 /* us delay between samples */
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#define TS_POLL_PERIOD 1000 /* us delay between samples */
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#define AK4183_12BIT 1 /*12 bit resolution*/
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#define devdbg(x...)
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//printk(x)
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#define AK4183_BIT_S (0x1 << 7)
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#define AK4183_BIT_A2 (0x1 << 6)
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#define AK4183_BIT_A1 (0x1 << 5)
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#define AK4183_BIT_A0 (0x1 << 4)
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#define AK4183_BIT_PD0 (0x1 << 2)
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#define AK4183_BIT_R8BIT (0x1 << 1)
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#define MAX_12BIT ((1 << 12) - 1)
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#if AK4183_12BIT
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#define ADC_ON_12BIT 0
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#else
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#define ADC_ON_12BIT AK4183_BIT_R8BIT
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#endif
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/*
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BIT Name Function
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7 S Start Bit. “1” Accelerate and Axis Command, “0”: Sleep mode Command
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6-4 A2-A0 Channel Selection Bits. Analog inputs to the A/D converter and the activated driver switches are
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selected. Please see the following table for the detail.
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3 X1 Don’t care
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2 PD0 Power down bit (refer to power-down control)
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1 MODE Resolution of A/D converter. “0”: 12 bit output “1”: 8 bit output
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0 X2 Don’t care
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*/
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#define READ_X ( ADC_ON_12BIT | AK4183_BIT_S | AK4183_BIT_A2 )
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#define READ_Y ( ADC_ON_12BIT | AK4183_BIT_S | AK4183_BIT_A0 | AK4183_BIT_A2 )
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#define READ_Z1 ( ADC_ON_12BIT | AK4183_BIT_S | AK4183_BIT_A1 | AK4183_BIT_A2 )
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#define READ_Z2 ( ADC_ON_12BIT | AK4183_BIT_S | AK4183_BIT_A0 | AK4183_BIT_A1 | AK4183_BIT_A2 )
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#define READ_AX ( ADC_ON_12BIT | AK4183_BIT_S )
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#define READ_AY ( ADC_ON_12BIT | AK4183_BIT_S | AK4183_BIT_A0 )
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#define READ_AXY ( ADC_ON_12BIT | AK4183_BIT_S | AK4183_BIT_A1 )
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#define PWRDOWN ( AK4183_BIT_S | AK4183_BIT_PD0 )
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#define samples 200
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////touch calib test data
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#define tmc_ax -11
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//-0,05705; *200
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#define tmc_bx 566382
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//2831,91107; *200
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#define tmc_x0 450
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//450;
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#define tmc_x10 476382
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//bx-x0
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#define tmc_ax_m_x0 -5135
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//ax*x0
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#define tmc_ay -11
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//-0,05579;
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#define tmc_by 593736
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//2968,68213 *200
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#define tmc_y0 440
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//440;
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#define tmc_y10 505736
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//bx-x0
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#define tmc_ay_m_y0 -4910
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//ay*y0
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struct ts_event {
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u16 x;
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u16 y;
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u16 z1, z2;
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};
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struct ak4183 {
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struct input_dev *input;
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char phys[32];
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struct delayed_work work;
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struct i2c_client *client;
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u16 model;
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u16 x_plate_ohms;
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bool pendown;
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int irq;
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int (*get_pendown_state)(void);
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void (*clear_penirq)(void);
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};
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/*
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0 4000 left 32 право 419
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верх лево X=0x0150 Y=0x0ee0 P=0x0106
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верх право X=0x0e50 Y=0x0ee0 P=0x0104
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низ лево X=0x0110 Y=0x0090 P=0x00ea
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низ право X=0x0dc0 Y=0x0080 P=0x00ec
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wince
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CalibrationData 2174,1990 563,3553 700,465 3463,506 3440,3547
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wince hex
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CalibrationData 0x87E,0x7C6 0x233,0xDE1 0x2BC,0x1D1 0xD87,0x1FA 0xD70,0xDDB
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середина, верх лево,низ лево,низ право, верх право
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*/
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static int abs_x[3] = {0x0110, 0x0dc0, 20};
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module_param_array(abs_x, int, NULL, 0);
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MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz");
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static int abs_y[3] = {0x0ee0, 0x0080, 20};
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module_param_array(abs_y, int, NULL, 0);
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MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz");
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static int abs_p[3] = {0, 0xfff, 2};
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module_param_array(abs_p, int, NULL, 0);
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MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz");
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static inline int ak4183_xfer(struct ak4183 *tsc, u8 cmd)
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{
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s32 data;
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u16 val;
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data = i2c_smbus_read_word_data(tsc->client, cmd);
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if (data < 0) {
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dev_err(&tsc->client->dev, "i2c io error: %d\n", data);
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return data;
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}
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/* The protocol and raw data format from i2c interface:
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* S Addr Wr [A] Comm [A] S Addr Rd [A] [DataLow] A [DataHigh] NA P
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* Where DataLow has [D11-D4], DataHigh has [D3-D0 << 4 | Dummy 4bit].
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*/
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val = swab16(data) >> 4;
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//dev_dbg(&tsc->client->dev, "data: 0x%x, val: 0x%x\n", data, val);
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return val;
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}
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static u32 ak4183_read_values(struct ak4183 *tsc, struct ts_event *tc)
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{
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u32 rt = 0;
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s32 rtt = 0;
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//s32 x,y;
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tc->x = ak4183_xfer(tsc, READ_X);//x
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tc->y = ak4183_xfer(tsc, READ_Y);//y
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//devdbg(KERN_INFO "AK4183: %5i;%5i;",
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// tc->x,tc->y);
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tc->z1 = ak4183_xfer(tsc,READ_Z1);//z1
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tc->z2 = ak4183_xfer(tsc,READ_Z2);//z2
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if (likely(tc->x && tc->z1)) {
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/* compute touch pressure resistance using equation #1 */
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rt = tc->x*(tc->z2-tc->z1)/(tc->z1);
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if (rt<6350){ // min toch
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rtt=rt-5000;//for func ; 0-max touch
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if (rt<5000){rt=5000;} // max
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rt=(6350-rt)*3;//0xFFF max
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if (rt>=0xFFF) {rt=0xFFE;}//max
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// devdbg(KERN_INFO "AK4183: %5u;%5u;%5u;%5u;%5u;",
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// tc->x,tc->y,tc->z1,tc->z2,rtt);
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}else{
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rt=0;//no touch
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}
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}
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//todo : need pwrdown
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if (rt){//*200
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tc->x=(u32)(((s32)(tc->x)*tmc_x10+rtt*tmc_ax_m_x0)/(tmc_x10+tmc_ax*rtt));
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tc->y=(u32)(((s32)(tc->y)*tmc_y10+rtt*tmc_ay_m_y0)/(tmc_y10+tmc_ay*rtt));
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}
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return rt;
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}
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static void ak4183_send_up_event(struct ak4183 *tsc)
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{
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struct input_dev *input = tsc->input;
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dev_dbg(&tsc->client->dev, "UP\n");
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input_report_key(input, BTN_TOUCH, 0);
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input_report_abs(input, ABS_PRESSURE, 0);
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input_sync(input);
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}
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static void ak4183_work(struct work_struct *work)
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{
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struct ak4183 *ts =
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container_of(to_delayed_work(work), struct ak4183, work);
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struct ts_event tc;
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u32 rt;
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/*
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* NOTE: We can't rely on the pressure to determine the pen down
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* state, even though this controller has a pressure sensor.
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* The pressure value can fluctuate for quite a while after
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* lifting the pen and in some cases may not even settle at the
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* expected value.
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*
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* The only safe way to check for the pen up condition is in the
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* work function by reading he pen signal state (it's a GPIO
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* and IRQ). Unfortunately such callback is not always available,
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* in that case we have rely on the pressure anyway.
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*/
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if (ts->get_pendown_state) {
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if (unlikely(!ts->get_pendown_state())) {
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ak4183_send_up_event(ts);
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ts->pendown = false;
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goto out;
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}
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//dev_dbg(&ts->client->dev, "pen is still down\n");
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}
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rt = ak4183_read_values(ts, &tc);
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if (rt > MAX_12BIT) {
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/*
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* Sample found inconsistent by debouncing or pressure is
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* beyond the maximum. Don't report it to user space,
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* repeat at least once more the measurement.
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*/
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dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt);
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goto out;
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}
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if (rt) {
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struct input_dev *input = ts->input;
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if (!ts->pendown) {
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dev_dbg(&ts->client->dev, "DOWN\n");
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input_report_key(input, BTN_TOUCH, 1);
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ts->pendown = true;
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}
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devdbg("ak4183 x = 0x%4x,y = 0x%4x,rt = 0x%4x", tc.x, tc.y, rt);
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input_report_abs(input, ABS_X, tc.x);
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input_report_abs(input, ABS_Y, tc.y);
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input_report_abs(input, ABS_PRESSURE, rt);
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input_sync(input);
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} else if (!ts->get_pendown_state && ts->pendown) {
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/*
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* We don't have callback to check pendown state, so we
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* have to assume that since pressure reported is 0 the
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* pen was lifted up.
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*/
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ak4183_send_up_event(ts);
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ts->pendown = false;
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}
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out:
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if (ts->pendown)
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schedule_delayed_work(&ts->work,
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usecs_to_jiffies(TS_POLL_PERIOD));
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else
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enable_irq(ts->irq);
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}
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static irqreturn_t ak4183_irq(int irq, void *handle)
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{
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struct ak4183 *ts = handle;
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if (!ts->get_pendown_state || likely(ts->get_pendown_state())) {
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disable_irq_nosync(ts->irq);
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schedule_delayed_work(&ts->work,
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usecs_to_jiffies(TS_POLL_DELAY));
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}
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if (ts->clear_penirq)
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{
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ts->clear_penirq();
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}
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schedule_delayed_work(&ts->work,
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usecs_to_jiffies(TS_POLL_DELAY));
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return IRQ_HANDLED;
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}
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static void ak4183_free_irq(struct ak4183 *ts)
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{
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free_irq(ts->irq, ts);
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if (cancel_delayed_work_sync(&ts->work)) {
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/*
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* Work was pending, therefore we need to enable
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* IRQ here to balance the disable_irq() done in the
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* interrupt handler.
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*/
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enable_irq(ts->irq);
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}
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}
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static int __devinit ak4183_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct ak4183 *ts;
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struct ak4183_platform_data *pdata = pdata = client->dev.platform_data;
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struct input_dev *input_dev;
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int err;
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if (!pdata) {
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dev_err(&client->dev, "platform data is required!\n");
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return -EINVAL;
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}
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_WORD_DATA))
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{
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dev_err(&client->dev, "err i2c_check_functionality!\n");
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return -EIO;
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}
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ts = kzalloc(sizeof(struct ak4183), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!ts || !input_dev) {
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err = -ENOMEM;
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dev_err(&client->dev, "err input_allocate_device!\n");
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goto err_free_mem;
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}
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ts->client = client;
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ts->irq = client->irq;
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ts->input = input_dev;
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INIT_DELAYED_WORK(&ts->work, ak4183_work);
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ts->model = pdata->model;
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ts->x_plate_ohms = pdata->x_plate_ohms;
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ts->get_pendown_state = pdata->get_pendown_state;
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ts->clear_penirq = pdata->clear_penirq;
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snprintf(ts->phys, sizeof(ts->phys),
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"%s/input0", dev_name(&client->dev));
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input_dev->name = "AK4183 Touchscreen";
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input_dev->phys = ts->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, abs_x[0], abs_x[1], abs_x[2], 0);
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input_set_abs_params(input_dev, ABS_Y, abs_y[0], abs_y[1], abs_y[2], 0);
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input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, 0, 0);
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if (pdata->init_platform_hw)
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pdata->init_platform_hw();
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//76 I 1 0 FE
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err = request_irq(ts->irq, ak4183_irq,
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IRQF_TRIGGER_FALLING,
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client->dev.driver->name, ts);
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if (err < 0) {
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dev_err(&client->dev, "irq %d busy?\n", ts->irq);
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goto err_free_mem;
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}
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/* Prepare for touch readings - power down ADC and enable PENIRQ */
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/* err = ak4183_xfer(ts, PWRDOWN);
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if (err < 0){
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goto err_free_irq;
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dev_err(&client->dev, "err ak4183_xfer\n");
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}
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*/
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err = input_register_device(input_dev);
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if (err){
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goto err_free_irq;
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dev_err(&client->dev, "err input_register_device\n");
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}
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i2c_set_clientdata(client, ts);
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return 0;
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err_free_irq:
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ak4183_free_irq(ts);
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if (pdata->exit_platform_hw)
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pdata->exit_platform_hw();
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err_free_mem:
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input_free_device(input_dev);
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kfree(ts);
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return err;
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}
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static int __devexit ak4183_remove(struct i2c_client *client)
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{
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struct ak4183 *ts = i2c_get_clientdata(client);
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struct ak4183_platform_data *pdata = client->dev.platform_data;
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ak4183_free_irq(ts);
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if (pdata->exit_platform_hw)
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pdata->exit_platform_hw();
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input_unregister_device(ts->input);
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kfree(ts);
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return 0;
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}
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static struct i2c_device_id ak4183_idtable[] = {
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{ "ak4183", 0x48 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ak4183_idtable);
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static struct i2c_driver ak4183_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "ak4183"
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},
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.id_table = ak4183_idtable,
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.probe = ak4183_probe,
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.remove = __devexit_p(ak4183_remove),
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};
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static int __init ak4183_init(void)
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{
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return i2c_add_driver(&ak4183_driver);
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}
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static void __exit ak4183_exit(void)
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{
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i2c_del_driver(&ak4183_driver);
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}
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module_init(ak4183_init);
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module_exit(ak4183_exit);
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MODULE_AUTHOR("angell <angell@angellfear.ru>");
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MODULE_DESCRIPTION("AK4183 TouchScreen Driver");
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MODULE_LICENSE("GPL");
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