|
@@ -48,10 +48,13 @@
|
|
|
|
|
|
#define TS_POLL_PERIOD msecs_to_jiffies(10)
|
|
#define TS_POLL_PERIOD msecs_to_jiffies(10)
|
|
|
|
|
|
|
|
+/* this driver doesn't aim at the peak continuous sample rate */
|
|
|
|
+#define SAMPLE_BITS (8 /*cmd*/ + 16 /*sample*/ + 2 /* before, after */)
|
|
|
|
+
|
|
struct ts_event {
|
|
struct ts_event {
|
|
/* For portability, we can't read 12 bit values using SPI (which
|
|
/* For portability, we can't read 12 bit values using SPI (which
|
|
* would make the controller deliver them as native byteorder u16
|
|
* would make the controller deliver them as native byteorder u16
|
|
- * with msbs zeroed). Instead, we read them as two 8-byte values,
|
|
|
|
|
|
+ * with msbs zeroed). Instead, we read them as two 8-bit values,
|
|
* which need byteswapping then range adjustment.
|
|
* which need byteswapping then range adjustment.
|
|
*/
|
|
*/
|
|
__be16 x;
|
|
__be16 x;
|
|
@@ -60,7 +63,7 @@ struct ts_event {
|
|
};
|
|
};
|
|
|
|
|
|
struct ads7846 {
|
|
struct ads7846 {
|
|
- struct input_dev input;
|
|
|
|
|
|
+ struct input_dev *input;
|
|
char phys[32];
|
|
char phys[32];
|
|
|
|
|
|
struct spi_device *spi;
|
|
struct spi_device *spi;
|
|
@@ -68,6 +71,7 @@ struct ads7846 {
|
|
u16 vref_delay_usecs;
|
|
u16 vref_delay_usecs;
|
|
u16 x_plate_ohms;
|
|
u16 x_plate_ohms;
|
|
|
|
|
|
|
|
+ u8 read_x, read_y, read_z1, read_z2;
|
|
struct ts_event tc;
|
|
struct ts_event tc;
|
|
|
|
|
|
struct spi_transfer xfer[8];
|
|
struct spi_transfer xfer[8];
|
|
@@ -117,10 +121,10 @@ struct ads7846 {
|
|
#define READ_12BIT_DFR(x) (ADS_START | ADS_A2A1A0_d_ ## x \
|
|
#define READ_12BIT_DFR(x) (ADS_START | ADS_A2A1A0_d_ ## x \
|
|
| ADS_12_BIT | ADS_DFR)
|
|
| ADS_12_BIT | ADS_DFR)
|
|
|
|
|
|
-static const u8 read_y = READ_12BIT_DFR(y) | ADS_PD10_ADC_ON;
|
|
|
|
-static const u8 read_z1 = READ_12BIT_DFR(z1) | ADS_PD10_ADC_ON;
|
|
|
|
-static const u8 read_z2 = READ_12BIT_DFR(z2) | ADS_PD10_ADC_ON;
|
|
|
|
-static const u8 read_x = READ_12BIT_DFR(x) | ADS_PD10_PDOWN; /* LAST */
|
|
|
|
|
|
+#define READ_Y (READ_12BIT_DFR(y) | ADS_PD10_ADC_ON)
|
|
|
|
+#define READ_Z1 (READ_12BIT_DFR(z1) | ADS_PD10_ADC_ON)
|
|
|
|
+#define READ_Z2 (READ_12BIT_DFR(z2) | ADS_PD10_ADC_ON)
|
|
|
|
+#define READ_X (READ_12BIT_DFR(x) | ADS_PD10_PDOWN) /* LAST */
|
|
|
|
|
|
/* single-ended samples need to first power up reference voltage;
|
|
/* single-ended samples need to first power up reference voltage;
|
|
* we leave both ADC and VREF powered
|
|
* we leave both ADC and VREF powered
|
|
@@ -128,8 +132,8 @@ static const u8 read_x = READ_12BIT_DFR(x) | ADS_PD10_PDOWN; /* LAST */
|
|
#define READ_12BIT_SER(x) (ADS_START | ADS_A2A1A0_ ## x \
|
|
#define READ_12BIT_SER(x) (ADS_START | ADS_A2A1A0_ ## x \
|
|
| ADS_12_BIT | ADS_SER)
|
|
| ADS_12_BIT | ADS_SER)
|
|
|
|
|
|
-static const u8 ref_on = READ_12BIT_DFR(x) | ADS_PD10_ALL_ON;
|
|
|
|
-static const u8 ref_off = READ_12BIT_DFR(y) | ADS_PD10_PDOWN;
|
|
|
|
|
|
+#define REF_ON (READ_12BIT_DFR(x) | ADS_PD10_ALL_ON)
|
|
|
|
+#define REF_OFF (READ_12BIT_DFR(y) | ADS_PD10_PDOWN)
|
|
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
|
|
@@ -138,7 +142,9 @@ static const u8 ref_off = READ_12BIT_DFR(y) | ADS_PD10_PDOWN;
|
|
*/
|
|
*/
|
|
|
|
|
|
struct ser_req {
|
|
struct ser_req {
|
|
|
|
+ u8 ref_on;
|
|
u8 command;
|
|
u8 command;
|
|
|
|
+ u8 ref_off;
|
|
u16 scratch;
|
|
u16 scratch;
|
|
__be16 sample;
|
|
__be16 sample;
|
|
struct spi_message msg;
|
|
struct spi_message msg;
|
|
@@ -152,7 +158,7 @@ static int ads7846_read12_ser(struct device *dev, unsigned command)
|
|
struct ser_req *req = kzalloc(sizeof *req, SLAB_KERNEL);
|
|
struct ser_req *req = kzalloc(sizeof *req, SLAB_KERNEL);
|
|
int status;
|
|
int status;
|
|
int sample;
|
|
int sample;
|
|
- int i;
|
|
|
|
|
|
+ int i;
|
|
|
|
|
|
if (!req)
|
|
if (!req)
|
|
return -ENOMEM;
|
|
return -ENOMEM;
|
|
@@ -160,7 +166,8 @@ static int ads7846_read12_ser(struct device *dev, unsigned command)
|
|
INIT_LIST_HEAD(&req->msg.transfers);
|
|
INIT_LIST_HEAD(&req->msg.transfers);
|
|
|
|
|
|
/* activate reference, so it has time to settle; */
|
|
/* activate reference, so it has time to settle; */
|
|
- req->xfer[0].tx_buf = &ref_on;
|
|
|
|
|
|
+ req->ref_on = REF_ON;
|
|
|
|
+ req->xfer[0].tx_buf = &req->ref_on;
|
|
req->xfer[0].len = 1;
|
|
req->xfer[0].len = 1;
|
|
req->xfer[1].rx_buf = &req->scratch;
|
|
req->xfer[1].rx_buf = &req->scratch;
|
|
req->xfer[1].len = 2;
|
|
req->xfer[1].len = 2;
|
|
@@ -182,7 +189,8 @@ static int ads7846_read12_ser(struct device *dev, unsigned command)
|
|
/* REVISIT: take a few more samples, and compare ... */
|
|
/* REVISIT: take a few more samples, and compare ... */
|
|
|
|
|
|
/* turn off reference */
|
|
/* turn off reference */
|
|
- req->xfer[4].tx_buf = &ref_off;
|
|
|
|
|
|
+ req->ref_off = REF_OFF;
|
|
|
|
+ req->xfer[4].tx_buf = &req->ref_off;
|
|
req->xfer[4].len = 1;
|
|
req->xfer[4].len = 1;
|
|
req->xfer[5].rx_buf = &req->scratch;
|
|
req->xfer[5].rx_buf = &req->scratch;
|
|
req->xfer[5].len = 2;
|
|
req->xfer[5].len = 2;
|
|
@@ -236,11 +244,12 @@ SHOW(vbatt)
|
|
|
|
|
|
static void ads7846_rx(void *ads)
|
|
static void ads7846_rx(void *ads)
|
|
{
|
|
{
|
|
- struct ads7846 *ts = ads;
|
|
|
|
- unsigned Rt;
|
|
|
|
- unsigned sync = 0;
|
|
|
|
- u16 x, y, z1, z2;
|
|
|
|
- unsigned long flags;
|
|
|
|
|
|
+ struct ads7846 *ts = ads;
|
|
|
|
+ struct input_dev *input_dev = ts->input;
|
|
|
|
+ unsigned Rt;
|
|
|
|
+ unsigned sync = 0;
|
|
|
|
+ u16 x, y, z1, z2;
|
|
|
|
+ unsigned long flags;
|
|
|
|
|
|
/* adjust: 12 bit samples (left aligned), built from
|
|
/* adjust: 12 bit samples (left aligned), built from
|
|
* two 8 bit values writen msb-first.
|
|
* two 8 bit values writen msb-first.
|
|
@@ -276,21 +285,21 @@ static void ads7846_rx(void *ads)
|
|
* won't notice that, even if nPENIRQ never fires ...
|
|
* won't notice that, even if nPENIRQ never fires ...
|
|
*/
|
|
*/
|
|
if (!ts->pendown && Rt != 0) {
|
|
if (!ts->pendown && Rt != 0) {
|
|
- input_report_key(&ts->input, BTN_TOUCH, 1);
|
|
|
|
|
|
+ input_report_key(input_dev, BTN_TOUCH, 1);
|
|
sync = 1;
|
|
sync = 1;
|
|
} else if (ts->pendown && Rt == 0) {
|
|
} else if (ts->pendown && Rt == 0) {
|
|
- input_report_key(&ts->input, BTN_TOUCH, 0);
|
|
|
|
|
|
+ input_report_key(input_dev, BTN_TOUCH, 0);
|
|
sync = 1;
|
|
sync = 1;
|
|
}
|
|
}
|
|
|
|
|
|
if (Rt) {
|
|
if (Rt) {
|
|
- input_report_abs(&ts->input, ABS_X, x);
|
|
|
|
- input_report_abs(&ts->input, ABS_Y, y);
|
|
|
|
- input_report_abs(&ts->input, ABS_PRESSURE, Rt);
|
|
|
|
|
|
+ input_report_abs(input_dev, ABS_X, x);
|
|
|
|
+ input_report_abs(input_dev, ABS_Y, y);
|
|
|
|
+ input_report_abs(input_dev, ABS_PRESSURE, Rt);
|
|
sync = 1;
|
|
sync = 1;
|
|
}
|
|
}
|
|
if (sync)
|
|
if (sync)
|
|
- input_sync(&ts->input);
|
|
|
|
|
|
+ input_sync(input_dev);
|
|
|
|
|
|
#ifdef VERBOSE
|
|
#ifdef VERBOSE
|
|
if (Rt || ts->pendown)
|
|
if (Rt || ts->pendown)
|
|
@@ -396,9 +405,10 @@ static int ads7846_resume(struct spi_device *spi)
|
|
static int __devinit ads7846_probe(struct spi_device *spi)
|
|
static int __devinit ads7846_probe(struct spi_device *spi)
|
|
{
|
|
{
|
|
struct ads7846 *ts;
|
|
struct ads7846 *ts;
|
|
|
|
+ struct input_dev *input_dev;
|
|
struct ads7846_platform_data *pdata = spi->dev.platform_data;
|
|
struct ads7846_platform_data *pdata = spi->dev.platform_data;
|
|
struct spi_transfer *x;
|
|
struct spi_transfer *x;
|
|
- int i;
|
|
|
|
|
|
+ int err;
|
|
|
|
|
|
if (!spi->irq) {
|
|
if (!spi->irq) {
|
|
dev_dbg(&spi->dev, "no IRQ?\n");
|
|
dev_dbg(&spi->dev, "no IRQ?\n");
|
|
@@ -411,9 +421,9 @@ static int __devinit ads7846_probe(struct spi_device *spi)
|
|
}
|
|
}
|
|
|
|
|
|
/* don't exceed max specified sample rate */
|
|
/* don't exceed max specified sample rate */
|
|
- if (spi->max_speed_hz > (125000 * 16)) {
|
|
|
|
|
|
+ if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) {
|
|
dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
|
|
dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
|
|
- (spi->max_speed_hz/16)/1000);
|
|
|
|
|
|
+ (spi->max_speed_hz/SAMPLE_BITS)/1000);
|
|
return -EINVAL;
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
|
|
@@ -423,13 +433,18 @@ static int __devinit ads7846_probe(struct spi_device *spi)
|
|
* to discard the four garbage LSBs.
|
|
* to discard the four garbage LSBs.
|
|
*/
|
|
*/
|
|
|
|
|
|
- if (!(ts = kzalloc(sizeof(struct ads7846), GFP_KERNEL)))
|
|
|
|
- return -ENOMEM;
|
|
|
|
|
|
+ ts = kzalloc(sizeof(struct ads7846), GFP_KERNEL);
|
|
|
|
+ input_dev = input_allocate_device();
|
|
|
|
+ if (!ts || !input_dev) {
|
|
|
|
+ err = -ENOMEM;
|
|
|
|
+ goto err_free_mem;
|
|
|
|
+ }
|
|
|
|
|
|
dev_set_drvdata(&spi->dev, ts);
|
|
dev_set_drvdata(&spi->dev, ts);
|
|
|
|
+ spi->dev.power.power_state = PMSG_ON;
|
|
|
|
|
|
ts->spi = spi;
|
|
ts->spi = spi;
|
|
- spi->dev.power.power_state = PMSG_ON;
|
|
|
|
|
|
+ ts->input = input_dev;
|
|
|
|
|
|
init_timer(&ts->timer);
|
|
init_timer(&ts->timer);
|
|
ts->timer.data = (unsigned long) ts;
|
|
ts->timer.data = (unsigned long) ts;
|
|
@@ -439,70 +454,80 @@ static int __devinit ads7846_probe(struct spi_device *spi)
|
|
ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100;
|
|
ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100;
|
|
ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
|
|
ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
|
|
|
|
|
|
- init_input_dev(&ts->input);
|
|
|
|
|
|
+ snprintf(ts->phys, sizeof(ts->phys), "%s/input0", spi->dev.bus_id);
|
|
|
|
|
|
- ts->input.dev = &spi->dev;
|
|
|
|
- ts->input.name = "ADS784x Touchscreen";
|
|
|
|
- snprintf(ts->phys, sizeof ts->phys, "%s/input0", spi->dev.bus_id);
|
|
|
|
- ts->input.phys = ts->phys;
|
|
|
|
|
|
+ input_dev->name = "ADS784x Touchscreen";
|
|
|
|
+ input_dev->phys = ts->phys;
|
|
|
|
+ input_dev->cdev.dev = &spi->dev;
|
|
|
|
|
|
- ts->input.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
|
|
|
|
- ts->input.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
|
|
|
|
- input_set_abs_params(&ts->input, ABS_X,
|
|
|
|
|
|
+ input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
|
|
|
|
+ input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
|
|
|
|
+ input_set_abs_params(input_dev, ABS_X,
|
|
pdata->x_min ? : 0,
|
|
pdata->x_min ? : 0,
|
|
pdata->x_max ? : MAX_12BIT,
|
|
pdata->x_max ? : MAX_12BIT,
|
|
0, 0);
|
|
0, 0);
|
|
- input_set_abs_params(&ts->input, ABS_Y,
|
|
|
|
|
|
+ input_set_abs_params(input_dev, ABS_Y,
|
|
pdata->y_min ? : 0,
|
|
pdata->y_min ? : 0,
|
|
pdata->y_max ? : MAX_12BIT,
|
|
pdata->y_max ? : MAX_12BIT,
|
|
0, 0);
|
|
0, 0);
|
|
- input_set_abs_params(&ts->input, ABS_PRESSURE,
|
|
|
|
|
|
+ input_set_abs_params(input_dev, ABS_PRESSURE,
|
|
pdata->pressure_min, pdata->pressure_max, 0, 0);
|
|
pdata->pressure_min, pdata->pressure_max, 0, 0);
|
|
|
|
|
|
- input_register_device(&ts->input);
|
|
|
|
-
|
|
|
|
/* set up the transfers to read touchscreen state; this assumes we
|
|
/* set up the transfers to read touchscreen state; this assumes we
|
|
* use formula #2 for pressure, not #3.
|
|
* use formula #2 for pressure, not #3.
|
|
*/
|
|
*/
|
|
|
|
+ INIT_LIST_HEAD(&ts->msg.transfers);
|
|
x = ts->xfer;
|
|
x = ts->xfer;
|
|
|
|
|
|
/* y- still on; turn on only y+ (and ADC) */
|
|
/* y- still on; turn on only y+ (and ADC) */
|
|
- x->tx_buf = &read_y;
|
|
|
|
|
|
+ ts->read_y = READ_Y;
|
|
|
|
+ x->tx_buf = &ts->read_y;
|
|
x->len = 1;
|
|
x->len = 1;
|
|
|
|
+ spi_message_add_tail(x, &ts->msg);
|
|
|
|
+
|
|
x++;
|
|
x++;
|
|
x->rx_buf = &ts->tc.y;
|
|
x->rx_buf = &ts->tc.y;
|
|
x->len = 2;
|
|
x->len = 2;
|
|
- x++;
|
|
|
|
|
|
+ spi_message_add_tail(x, &ts->msg);
|
|
|
|
|
|
/* turn y+ off, x- on; we'll use formula #2 */
|
|
/* turn y+ off, x- on; we'll use formula #2 */
|
|
if (ts->model == 7846) {
|
|
if (ts->model == 7846) {
|
|
- x->tx_buf = &read_z1;
|
|
|
|
|
|
+ x++;
|
|
|
|
+ ts->read_z1 = READ_Z1;
|
|
|
|
+ x->tx_buf = &ts->read_z1;
|
|
x->len = 1;
|
|
x->len = 1;
|
|
|
|
+ spi_message_add_tail(x, &ts->msg);
|
|
|
|
+
|
|
x++;
|
|
x++;
|
|
x->rx_buf = &ts->tc.z1;
|
|
x->rx_buf = &ts->tc.z1;
|
|
x->len = 2;
|
|
x->len = 2;
|
|
- x++;
|
|
|
|
|
|
+ spi_message_add_tail(x, &ts->msg);
|
|
|
|
|
|
- x->tx_buf = &read_z2;
|
|
|
|
|
|
+ x++;
|
|
|
|
+ ts->read_z2 = READ_Z2;
|
|
|
|
+ x->tx_buf = &ts->read_z2;
|
|
x->len = 1;
|
|
x->len = 1;
|
|
|
|
+ spi_message_add_tail(x, &ts->msg);
|
|
|
|
+
|
|
x++;
|
|
x++;
|
|
x->rx_buf = &ts->tc.z2;
|
|
x->rx_buf = &ts->tc.z2;
|
|
x->len = 2;
|
|
x->len = 2;
|
|
- x++;
|
|
|
|
|
|
+ spi_message_add_tail(x, &ts->msg);
|
|
}
|
|
}
|
|
|
|
|
|
/* turn y- off, x+ on, then leave in lowpower */
|
|
/* turn y- off, x+ on, then leave in lowpower */
|
|
- x->tx_buf = &read_x;
|
|
|
|
|
|
+ x++;
|
|
|
|
+ ts->read_x = READ_X;
|
|
|
|
+ x->tx_buf = &ts->read_x;
|
|
x->len = 1;
|
|
x->len = 1;
|
|
|
|
+ spi_message_add_tail(x, &ts->msg);
|
|
|
|
+
|
|
x++;
|
|
x++;
|
|
x->rx_buf = &ts->tc.x;
|
|
x->rx_buf = &ts->tc.x;
|
|
x->len = 2;
|
|
x->len = 2;
|
|
- x++;
|
|
|
|
-
|
|
|
|
- CS_CHANGE(x[-1]);
|
|
|
|
|
|
+ CS_CHANGE(*x);
|
|
|
|
+ spi_message_add_tail(x, &ts->msg);
|
|
|
|
|
|
- for (i = 0; i < x - ts->xfer; i++)
|
|
|
|
- spi_message_add_tail(&ts->xfer[i], &ts->msg);
|
|
|
|
ts->msg.complete = ads7846_rx;
|
|
ts->msg.complete = ads7846_rx;
|
|
ts->msg.context = ts;
|
|
ts->msg.context = ts;
|
|
|
|
|
|
@@ -510,9 +535,8 @@ static int __devinit ads7846_probe(struct spi_device *spi)
|
|
SA_SAMPLE_RANDOM | SA_TRIGGER_FALLING,
|
|
SA_SAMPLE_RANDOM | SA_TRIGGER_FALLING,
|
|
spi->dev.bus_id, ts)) {
|
|
spi->dev.bus_id, ts)) {
|
|
dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
|
|
dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
|
|
- input_unregister_device(&ts->input);
|
|
|
|
- kfree(ts);
|
|
|
|
- return -EBUSY;
|
|
|
|
|
|
+ err = -EBUSY;
|
|
|
|
+ goto err_free_mem;
|
|
}
|
|
}
|
|
|
|
|
|
dev_info(&spi->dev, "touchscreen, irq %d\n", spi->irq);
|
|
dev_info(&spi->dev, "touchscreen, irq %d\n", spi->irq);
|
|
@@ -534,7 +558,18 @@ static int __devinit ads7846_probe(struct spi_device *spi)
|
|
device_create_file(&spi->dev, &dev_attr_vbatt);
|
|
device_create_file(&spi->dev, &dev_attr_vbatt);
|
|
device_create_file(&spi->dev, &dev_attr_vaux);
|
|
device_create_file(&spi->dev, &dev_attr_vaux);
|
|
|
|
|
|
|
|
+ err = input_register_device(input_dev);
|
|
|
|
+ if (err)
|
|
|
|
+ goto err_free_irq;
|
|
|
|
+
|
|
return 0;
|
|
return 0;
|
|
|
|
+
|
|
|
|
+ err_free_irq:
|
|
|
|
+ free_irq(spi->irq, ts);
|
|
|
|
+ err_free_mem:
|
|
|
|
+ input_free_device(input_dev);
|
|
|
|
+ kfree(ts);
|
|
|
|
+ return err;
|
|
}
|
|
}
|
|
|
|
|
|
static int __devexit ads7846_remove(struct spi_device *spi)
|
|
static int __devexit ads7846_remove(struct spi_device *spi)
|
|
@@ -554,7 +589,7 @@ static int __devexit ads7846_remove(struct spi_device *spi)
|
|
device_remove_file(&spi->dev, &dev_attr_vbatt);
|
|
device_remove_file(&spi->dev, &dev_attr_vbatt);
|
|
device_remove_file(&spi->dev, &dev_attr_vaux);
|
|
device_remove_file(&spi->dev, &dev_attr_vaux);
|
|
|
|
|
|
- input_unregister_device(&ts->input);
|
|
|
|
|
|
+ input_unregister_device(ts->input);
|
|
kfree(ts);
|
|
kfree(ts);
|
|
|
|
|
|
dev_dbg(&spi->dev, "unregistered touchscreen\n");
|
|
dev_dbg(&spi->dev, "unregistered touchscreen\n");
|