Input: touchscreen: ads7846: keep copy of pdata in private struct

Allocate a copy of the pdata, and keep a pointer to it in the private struct ads7846. Also, kill some members that used to be in both structs.

This is needed for the upcoming DT support.

Signed-off-by Daniel Mack <[email protected]>

---

Hi Dmitry,

this is the alternative approach, as described eariler in our email thread. It works equally well.

Thanks for having another look.

I'm resending this after 10 days of silence, to make sure it isn't lost :)

Daniel

 drivers/input/touchscreen/ads7846.c | 78 ++++++++++++++++++++-----------------
 1 file changed, 43 insertions(+), 35 deletions(-)

drivers/input/touchscreen/ads7846.c +43 -35

index 84ccf14..198677d 100644
@@ -104,12 +104,8 @@ struct ads7846 {
 #endif
 
 	u16			model;
-	u16			vref_mv;
 	u16			vref_delay_usecs;
-	u16			x_plate_ohms;
-	u16			pressure_max;
 
-	bool			swap_xy;
 	bool			use_internal;
 
 	struct ads7846_packet	*packet;

@@ -143,6 +139,9 @@ struct ads7846 {
 	int			gpio_pendown;
 
 	void			(*wait_for_sync)(void);
+
+	/* platform data from board file or DT */
+	struct ads7846_platform_data *pdata;
 };
 
 /* leave chip selected when we're done, for quicker re-select? */

@@ -456,7 +455,7 @@ static inline unsigned vaux_adjust(struct ads7846 *ts, ssize_t v)
 	unsigned retval = v;
 
 	/* external resistors may scale vAUX into 0..vREF */
-	retval *= ts->vref_mv;
+	retval *= ts->pdata->vref_mv;
 	retval = retval >> 12;
 
 	return retval;

@@ -515,25 +514,25 @@ static int ads784x_hwmon_register(struct spi_device *spi, struct ads7846 *ts)
 	/* hwmon sensors need a reference voltage */
 	switch (ts->model) {
 	case 7846:
-		if (!ts->vref_mv) {
+		if (!ts->pdata->vref_mv) {
 			dev_dbg(&spi->dev, "assuming 2.5V internal vREF\n");
-			ts->vref_mv = 2500;
+			ts->pdata->vref_mv = 2500;
 			ts->use_internal = true;
 		}
 		break;
 	case 7845:
 	case 7843:
-		if (!ts->vref_mv) {
+		if (!ts->pdata->vref_mv) {
 			dev_warn(&spi->dev,
 				"external vREF for ADS%d not specified\n",
-				ts->model);
+				ts->pdata->model);
 			return 0;
 		}
 		break;
 	}
 
 	/* different chips have different sensor groups */
-	switch (ts->model) {
+	switch (ts->pdata->model) {
 	case 7846:
 		ts->attr_group = &ads7846_attr_group;
 		break;

@@ -544,7 +543,7 @@ static int ads784x_hwmon_register(struct spi_device *spi, struct ads7846 *ts)
 		ts->attr_group = &ads7843_attr_group;
 		break;
 	default:
-		dev_dbg(&spi->dev, "ADS%d not recognized\n", ts->model);
+		dev_dbg(&spi->dev, "ADS%d not recognized\n", ts->pdata->model);
 		return 0;
 	}
 

@@ -700,7 +699,7 @@ static int ads7846_get_value(struct ads7846 *ts, struct spi_message *m)
 	struct spi_transfer *t =
 		list_entry(m->transfers.prev, struct spi_transfer, transfer_list);
 
-	if (ts->model == 7845) {
+	if (ts->pdata->model == 7845) {
 		return be16_to_cpup((__be16 *)&(((char*)t->rx_buf)[1])) >> 3;
 	} else {
 		/*

@@ -776,6 +775,7 @@ static void ads7846_read_state(struct ads7846 *ts)
 static void ads7846_report_state(struct ads7846 *ts)
 {
 	struct ads7846_packet *packet = ts->packet;
+	struct ads7846_platform_data *pdata = ts->pdata;
 	unsigned int Rt;
 	u16 x, y, z1, z2;
 

@@ -784,7 +784,7 @@ static void ads7846_report_state(struct ads7846 *ts)
 	 * from on-the-wire format as part of debouncing to get stable
 	 * readings.
 	 */
-	if (ts->model == 7845) {
+	if (pdata->model == 7845) {
 		x = *(u16 *)packet->tc.x_buf;
 		y = *(u16 *)packet->tc.y_buf;
 		z1 = 0;

@@ -800,11 +800,11 @@ static void ads7846_report_state(struct ads7846 *ts)
 	if (x == MAX_12BIT)
 		x = 0;
 
-	if (ts->model == 7843) {
-		Rt = ts->pressure_max / 2;
-	} else if (ts->model == 7845) {
+	if (pdata->model == 7843) {
+		Rt = pdata->pressure_max / 2;
+	} else if (pdata->model == 7845) {
 		if (get_pendown_state(ts))
-			Rt = ts->pressure_max / 2;
+			Rt = pdata->pressure_max / 2;
 		else
 			Rt = 0;
 		dev_vdbg(&ts->spi->dev, "x/y: %d/%d, PD %d\n", x, y, Rt);

@@ -813,7 +813,7 @@ static void ads7846_report_state(struct ads7846 *ts)
 		Rt = z2;
 		Rt -= z1;
 		Rt *= x;
-		Rt *= ts->x_plate_ohms;
+		Rt *= pdata->x_plate_ohms;
 		Rt /= z1;
 		Rt = (Rt + 2047) >> 12;
 	} else {

@@ -825,7 +825,7 @@ static void ads7846_report_state(struct ads7846 *ts)
 	 * the maximum. Don't report it to user space, repeat at least
 	 * once more the measurement
 	 */
-	if (packet->tc.ignore || Rt > ts->pressure_max) {
+	if (packet->tc.ignore || Rt > pdata->pressure_max) {
 		dev_vdbg(&ts->spi->dev, "ignored %d pressure %d\n",
 			 packet->tc.ignore, Rt);
 		return;

@@ -853,7 +853,7 @@ static void ads7846_report_state(struct ads7846 *ts)
 	if (Rt) {
 		struct input_dev *input = ts->input;
 
-		if (ts->swap_xy)
+		if (pdata->swap_xy)
 			swap(x, y);
 
 		if (!ts->pendown) {

@@ -864,7 +864,7 @@ static void ads7846_report_state(struct ads7846 *ts)
 
 		input_report_abs(input, ABS_X, x);
 		input_report_abs(input, ABS_Y, y);
-		input_report_abs(input, ABS_PRESSURE, ts->pressure_max - Rt);
+		input_report_abs(input, ABS_PRESSURE, pdata->pressure_max - Rt);
 
 		input_sync(input);
 		dev_vdbg(&ts->spi->dev, "%4d/%4d/%4d\n", x, y, Rt);

@@ -963,7 +963,7 @@ static SIMPLE_DEV_PM_OPS(ads7846_pm, ads7846_suspend, ads7846_resume);
 static int ads7846_setup_pendown(struct spi_device *spi,
 					   struct ads7846 *ts)
 {
-	struct ads7846_platform_data *pdata = spi->dev.platform_data;
+	struct ads7846_platform_data *pdata = ts->pdata;
 	int err;
 
 	/*

@@ -1003,20 +1003,20 @@ static int ads7846_setup_pendown(struct spi_device *spi,
  * use formula #2 for pressure, not #3.
  */
 static void ads7846_setup_spi_msg(struct ads7846 *ts,
-				const struct ads7846_platform_data *pdata)
+				  struct ads7846_platform_data *pdata)
 {
 	struct spi_message *m = &ts->msg[0];
 	struct spi_transfer *x = ts->xfer;
 	struct ads7846_packet *packet = ts->packet;
 	int vref = pdata->keep_vref_on;
 
-	if (ts->model == 7873) {
+	if (pdata->model == 7873) {
 		/*
 		 * The AD7873 is almost identical to the ADS7846
 		 * keep VREF off during differential/ratiometric
 		 * conversion modes.
 		 */
-		ts->model = 7846;
+		pdata->model = 7846;
 		vref = 0;
 	}
 

@@ -1024,7 +1024,7 @@ static void ads7846_setup_spi_msg(struct ads7846 *ts,
 	spi_message_init(m);
 	m->context = ts;
 
-	if (ts->model == 7845) {
+	if (pdata->model == 7845) {
 		packet->read_y_cmd[0] = READ_Y(vref);
 		packet->read_y_cmd[1] = 0;
 		packet->read_y_cmd[2] = 0;

@@ -1069,7 +1069,7 @@ static void ads7846_setup_spi_msg(struct ads7846 *ts,
 	spi_message_init(m);
 	m->context = ts;
 
-	if (ts->model == 7845) {
+	if (pdata->model == 7845) {
 		x++;
 		packet->read_x_cmd[0] = READ_X(vref);
 		packet->read_x_cmd[1] = 0;

@@ -1108,7 +1108,7 @@ static void ads7846_setup_spi_msg(struct ads7846 *ts,
 	}
 
 	/* turn y+ off, x- on; we'll use formula #2 */
-	if (ts->model == 7846) {
+	if (pdata->model == 7846) {
 		ts->msg_count++;
 		m++;
 		spi_message_init(m);

@@ -1178,7 +1178,7 @@ static void ads7846_setup_spi_msg(struct ads7846 *ts,
 	spi_message_init(m);
 	m->context = ts;
 
-	if (ts->model == 7845) {
+	if (pdata->model == 7845) {
 		x++;
 		packet->pwrdown_cmd[0] = PWRDOWN;
 		packet->pwrdown_cmd[1] = 0;

@@ -1247,19 +1247,27 @@ static int ads7846_probe(struct spi_device *spi)
 
 	spi_set_drvdata(spi, ts);
 
+	ts->pdata = pdata;
 	ts->packet = packet;
 	ts->spi = spi;
 	ts->input = input_dev;
-	ts->vref_mv = pdata->vref_mv;
-	ts->swap_xy = pdata->swap_xy;
 
 	mutex_init(&ts->lock);
 	init_waitqueue_head(&ts->wait);
 
-	ts->model = pdata->model ? : 7846;
-	ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100;
-	ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
-	ts->pressure_max = pdata->pressure_max ? : ~0;
+	/* pdata fallback defaults */
+
+	if (!pdata->model)
+		pdata->model = 7846;
+
+	if (!pdata->vref_delay_usecs)
+		pdata->vref_delay_usecs = 100;
+
+	if (!pdata->x_plate_ohms)
+		pdata->x_plate_ohms = 400;
+
+	if (!pdata->pressure_max)
+		pdata->pressure_max = ~0;
 
 	if (pdata->filter != NULL) {
 		if (pdata->filter_init != NULL) {