android_kernel_cmhtcleo/drivers/input/touchscreen/msm_ts.c
2010-08-27 11:19:57 +02:00

344 lines
9.2 KiB
C

/* drivers/input/touchscreen/msm_ts.c
*
* Copyright (C) 2008 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
* TODO:
* - Add a timer to simulate a pen_up in case there's a timeout.
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <mach/msm_ts.h>
#define TSSC_CTL 0x100
#define TSSC_CTL_PENUP_IRQ (1 << 12)
#define TSSC_CTL_DATA_FLAG (1 << 11)
#define TSSC_CTL_DEBOUNCE_EN (1 << 6)
#define TSSC_CTL_EN_AVERAGE (1 << 5)
#define TSSC_CTL_MODE_MASTER (3 << 3)
#define TSSC_CTL_ENABLE (1 << 0)
#define TSSC_OPN 0x104
#define TSSC_OPN_NOOP 0x00
#define TSSC_OPN_4WIRE_X 0x01
#define TSSC_OPN_4WIRE_Y 0x02
#define TSSC_OPN_4WIRE_Z1 0x03
#define TSSC_OPN_4WIRE_Z2 0x04
#define TSSC_SAMPLING_INT 0x108
#define TSSC_STATUS 0x10c
#define TSSC_AVG_12 0x110
#define TSSC_AVG_34 0x114
#define TSSC_SAMPLE(op,samp) ((0x118 + ((op & 0x3) * 0x20)) + \
((samp & 0x7) * 0x4))
#define TSSC_TEST_1 0x198
#define TSSC_TEST_2 0x19c
struct msm_ts {
struct msm_ts_platform_data *pdata;
struct input_dev *input_dev;
void __iomem *tssc_base;
uint32_t ts_down:1;
struct ts_virt_key *vkey_down;
};
static uint32_t msm_tsdebug;
module_param_named(tsdebug, msm_tsdebug, uint, 0664);
#define tssc_readl(t, a) (readl(((t)->tssc_base) + (a)))
#define tssc_writel(t, v, a) do {writel(v, ((t)->tssc_base) + (a));} while(0)
static void setup_next_sample(struct msm_ts *ts)
{
uint32_t tmp;
/* 1.2ms debounce time */
tmp = ((2 << 7) | TSSC_CTL_DEBOUNCE_EN | TSSC_CTL_EN_AVERAGE |
TSSC_CTL_MODE_MASTER | TSSC_CTL_ENABLE);
tssc_writel(ts, tmp, TSSC_CTL);
}
static struct ts_virt_key *find_virt_key(struct msm_ts *ts,
struct msm_ts_virtual_keys *vkeys,
uint32_t val)
{
int i;
if (!vkeys)
return NULL;
for (i = 0; i < vkeys->num_keys; ++i)
if ((val >= vkeys->keys[i].min) && (val <= vkeys->keys[i].max))
return &vkeys->keys[i];
return NULL;
}
static irqreturn_t msm_ts_irq(int irq, void *dev_id)
{
struct msm_ts *ts = dev_id;
struct msm_ts_platform_data *pdata = ts->pdata;
uint32_t tssc_avg12, tssc_avg34, tssc_status, tssc_ctl;
int x, y, z1, z2;
int was_down;
int down;
tssc_ctl = tssc_readl(ts, TSSC_CTL);
tssc_status = tssc_readl(ts, TSSC_STATUS);
tssc_avg12 = tssc_readl(ts, TSSC_AVG_12);
tssc_avg34 = tssc_readl(ts, TSSC_AVG_34);
setup_next_sample(ts);
x = tssc_avg12 & 0xffff;
y = tssc_avg12 >> 16;
z1 = tssc_avg34 & 0xffff;
z2 = tssc_avg34 >> 16;
/* invert the inputs if necessary */
if (pdata->inv_x) x = pdata->inv_x - x;
if (pdata->inv_y) y = pdata->inv_y - y;
if (x < 0) x = 0;
if (y < 0) y = 0;
down = !(tssc_ctl & TSSC_CTL_PENUP_IRQ);
was_down = ts->ts_down;
ts->ts_down = down;
/* no valid data */
if (down && !(tssc_ctl & TSSC_CTL_DATA_FLAG))
return IRQ_HANDLED;
if (msm_tsdebug & 2)
printk("%s: down=%d, x=%d, y=%d, z1=%d, z2=%d, status %x\n",
__func__, down, x, y, z1, z2, tssc_status);
if (!was_down && down) {
struct ts_virt_key *vkey = NULL;
if (pdata->vkeys_y && (y > pdata->virt_y_start))
vkey = find_virt_key(ts, pdata->vkeys_y, x);
if (!vkey && ts->pdata->vkeys_x && (x > pdata->virt_x_start))
vkey = find_virt_key(ts, pdata->vkeys_x, y);
if (vkey) {
WARN_ON(ts->vkey_down != NULL);
if(msm_tsdebug)
printk("%s: virtual key down %d\n", __func__,
vkey->key);
ts->vkey_down = vkey;
input_report_key(ts->input_dev, vkey->key, 1);
input_sync(ts->input_dev);
return IRQ_HANDLED;
}
} else if (ts->vkey_down != NULL) {
if (!down) {
if(msm_tsdebug)
printk("%s: virtual key up %d\n", __func__,
ts->vkey_down->key);
input_report_key(ts->input_dev, ts->vkey_down->key, 0);
input_sync(ts->input_dev);
ts->vkey_down = NULL;
}
return IRQ_HANDLED;
}
if (down) {
input_report_abs(ts->input_dev, ABS_X, x);
input_report_abs(ts->input_dev, ABS_Y, y);
input_report_abs(ts->input_dev, ABS_PRESSURE, z1);
}
input_report_key(ts->input_dev, BTN_TOUCH, down);
input_sync(ts->input_dev);
return IRQ_HANDLED;
}
static void dump_tssc_regs(struct msm_ts *ts)
{
#define __dump_tssc_reg(r) \
do { printk(#r " %x\n", tssc_readl(ts, (r))); } while(0)
__dump_tssc_reg(TSSC_CTL);
__dump_tssc_reg(TSSC_OPN);
__dump_tssc_reg(TSSC_SAMPLING_INT);
__dump_tssc_reg(TSSC_STATUS);
__dump_tssc_reg(TSSC_AVG_12);
__dump_tssc_reg(TSSC_AVG_34);
#undef __dump_tssc_reg
}
static int __devinit msm_ts_hw_init(struct msm_ts *ts)
{
uint32_t tmp;
/* Enable the register clock to tssc so we can configure it. */
tssc_writel(ts, TSSC_CTL_ENABLE, TSSC_CTL);
/* op1 - measure X, 1 sample, 12bit resolution */
tmp = (TSSC_OPN_4WIRE_X << 16) | (2 << 8) | (2 << 0);
/* op2 - measure Y, 1 sample, 12bit resolution */
tmp |= (TSSC_OPN_4WIRE_Y << 20) | (2 << 10) | (2 << 2);
/* op3 - measure Z1, 1 sample, 8bit resolution */
tmp |= (TSSC_OPN_4WIRE_Z1 << 24) | (2 << 12) | (0 << 4);
/* XXX: we don't actually need to measure Z2 (thus 0 samples) when
* doing voltage-driven measurement */
/* op4 - measure Z2, 0 samples, 8bit resolution */
tmp |= (TSSC_OPN_4WIRE_Z2 << 28) | (0 << 14) | (0 << 6);
tssc_writel(ts, tmp, TSSC_OPN);
/* 16ms sampling interval */
tssc_writel(ts, 16, TSSC_SAMPLING_INT);
setup_next_sample(ts);
return 0;
}
static int __devinit msm_ts_probe(struct platform_device *pdev)
{
struct msm_ts_platform_data *pdata = pdev->dev.platform_data;
struct msm_ts *ts;
struct resource *tssc_res;
struct resource *irq1_res;
struct resource *irq2_res;
int err = 0;
int i;
tssc_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "tssc");
irq1_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "tssc1");
irq2_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "tssc2");
if (!tssc_res || !irq1_res || !irq2_res) {
pr_err("%s: required resources not defined\n", __func__);
return -ENODEV;
}
if (pdata == NULL) {
pr_err("%s: missing platform_data\n", __func__);
return -ENODEV;
}
ts = kzalloc(sizeof(struct msm_ts), GFP_KERNEL);
if (ts == NULL) {
pr_err("%s: No memory for struct msm_ts\n", __func__);
return -ENOMEM;
}
ts->pdata = pdata;
ts->tssc_base = ioremap(tssc_res->start, resource_size(tssc_res));
if (ts->tssc_base == NULL) {
pr_err("%s: Can't ioremap region (0x%08x - 0x%08x)\n", __func__,
(uint32_t)tssc_res->start, (uint32_t)tssc_res->end);
err = -ENOMEM;
goto err_ioremap_tssc;
}
ts->input_dev = input_allocate_device();
if (ts->input_dev == NULL) {
pr_err("failed to allocate touchscreen input device\n");
err = -ENOMEM;
goto err_alloc_input_dev;
}
ts->input_dev->name = "msm-touchscreen";
input_set_drvdata(ts->input_dev, ts);
input_set_capability(ts->input_dev, EV_KEY, BTN_TOUCH);
set_bit(EV_ABS, ts->input_dev->evbit);
input_set_abs_params(ts->input_dev, ABS_X, pdata->min_x, pdata->max_x,
0, 0);
input_set_abs_params(ts->input_dev, ABS_Y, pdata->min_y, pdata->max_y,
0, 0);
input_set_abs_params(ts->input_dev, ABS_PRESSURE, pdata->min_press,
pdata->max_press, 0, 0);
for (i = 0; pdata->vkeys_x && (i < pdata->vkeys_x->num_keys); ++i)
input_set_capability(ts->input_dev, EV_KEY,
pdata->vkeys_x->keys[i].key);
for (i = 0; pdata->vkeys_y && (i < pdata->vkeys_y->num_keys); ++i)
input_set_capability(ts->input_dev, EV_KEY,
pdata->vkeys_y->keys[i].key);
err = input_register_device(ts->input_dev);
if (err != 0) {
pr_err("%s: failed to register input device\n", __func__);
goto err_input_dev_reg;
}
msm_ts_hw_init(ts);
err = request_irq(irq1_res->start, msm_ts_irq,
(irq1_res->flags & ~IORESOURCE_IRQ) | IRQF_DISABLED,
"msm_touchscreen", ts);
if (err != 0) {
pr_err("%s: Cannot register irq1 (%d)\n", __func__, err);
goto err_request_irq1;
}
err = request_irq(irq2_res->start, msm_ts_irq,
(irq2_res->flags & ~IORESOURCE_IRQ) | IRQF_DISABLED,
"msm_touchscreen", ts);
if (err != 0) {
pr_err("%s: Cannot register irq2 (%d)\n", __func__, err);
goto err_request_irq2;
}
platform_set_drvdata(pdev, ts);
pr_info("%s: tssc_base=%p irq1=%d irq2=%d\n", __func__,
ts->tssc_base, (int)irq1_res->start, (int)irq2_res->start);
return 0;
err_request_irq2:
free_irq(irq1_res->start, ts);
err_request_irq1:
/* disable the tssc */
tssc_writel(ts, TSSC_CTL_ENABLE, TSSC_CTL);
err_input_dev_reg:
input_set_drvdata(ts->input_dev, NULL);
input_free_device(ts->input_dev);
err_alloc_input_dev:
iounmap(ts->tssc_base);
err_ioremap_tssc:
kfree(ts);
return err;
}
static struct platform_driver msm_touchscreen_driver = {
.driver = {
.name = "msm_touchscreen",
.owner = THIS_MODULE,
},
.probe = msm_ts_probe,
};
static int __init msm_ts_init(void)
{
return platform_driver_register(&msm_touchscreen_driver);
}
device_initcall(msm_ts_init);
MODULE_DESCRIPTION("Qualcomm MSM/QSD Touchscreen controller driver");
MODULE_LICENSE("GPL");