iio: accel: kxcjk-1013: add support for kxtj2-1009

This patch adds support for KXTJ2-1009 3-axis acceleromenter sensor.
KXTJ2-1009 uses the same register definitions as KXCJK-1013.

The specification for KXTJ2-1009 can be downloaded from:
http://www.kionix.com/sites/default/files/KXTJ2-1009%20Specifications%20Rev%204.pdfReviewed-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/accel/Kconfig

@@ -99,7 +99,8 @@ config KXCJK1013
 	select IIO_TRIGGERED_BUFFER
 	help
 	  Say Y here if you want to build a driver for the Kionix KXCJK-1013
-	  triaxial acceleration sensor. This driver also supports KXCJ9-1008.
+	  triaxial acceleration sensor. This driver also supports KXCJ9-1008
+	  and KXTJ2-1009.
 
 	  To compile this driver as a module, choose M here: the module will
 	  be called kxcjk-1013.

drivers/iio/accel/kxcjk-1013.c

@@ -85,6 +85,13 @@
 
 #define KXCJK1013_DEFAULT_WAKE_THRES	1
 
+enum kx_chipset {
+	KXCJK1013,
+	KXCJ91008,
+	KXTJ21009,
+	KX_MAX_CHIPS /* this must be last */
+};
+
 struct kxcjk1013_data {
 	struct i2c_client *client;
 	struct iio_trigger *dready_trig;
@@ -100,6 +107,7 @@ struct kxcjk1013_data {
 	int ev_enable_state;
 	bool motion_trigger_on;
 	int64_t timestamp;
+	enum kx_chipset chipset;
 };
 
 enum kxcjk1013_axis {
@@ -133,10 +141,53 @@ static const struct {
 static const struct {
 	int odr_bits;
 	int usec;
-} odr_start_up_times[] = { {0x08, 100000}, {0x09, 100000}, {0x0A, 100000},
-			   {0x0B, 100000}, { 0, 80000}, {0x01, 41000},
-			   {0x02, 21000}, {0x03, 11000}, {0x04, 6400},
-			   {0x05, 3900}, {0x06, 2700}, {0x07, 2100} };
+} odr_start_up_times[KX_MAX_CHIPS][12] = {
+	/* KXCJK-1013 */
+	{
+		{0x08, 100000},
+		{0x09, 100000},
+		{0x0A, 100000},
+		{0x0B, 100000},
+		{0, 80000},
+		{0x01, 41000},
+		{0x02, 21000},
+		{0x03, 11000},
+		{0x04, 6400},
+		{0x05, 3900},
+		{0x06, 2700},
+		{0x07, 2100},
+	},
+	/* KXCJ9-1008 */
+	{
+		{0x08, 100000},
+		{0x09, 100000},
+		{0x0A, 100000},
+		{0x0B, 100000},
+		{0, 80000},
+		{0x01, 41000},
+		{0x02, 21000},
+		{0x03, 11000},
+		{0x04, 6400},
+		{0x05, 3900},
+		{0x06, 2700},
+		{0x07, 2100},
+	},
+	/* KXCTJ2-1009 */
+	{
+		{0x08, 1240000},
+		{0x09, 621000},
+		{0x0A, 309000},
+		{0x0B, 151000},
+		{0, 80000},
+		{0x01, 41000},
+		{0x02, 21000},
+		{0x03, 11000},
+		{0x04, 6000},
+		{0x05, 4000},
+		{0x06, 3000},
+		{0x07, 2000},
+	},
+};
 
 static const struct {
 	u16 scale;
@@ -310,10 +361,11 @@ static int kxcjk1013_chip_init(struct kxcjk1013_data *data)
 static int kxcjk1013_get_startup_times(struct kxcjk1013_data *data)
 {
 	int i;
+	int idx = data->chipset;
 
-	for (i = 0; i < ARRAY_SIZE(odr_start_up_times); ++i) {
-		if (odr_start_up_times[i].odr_bits == data->odr_bits)
-			return odr_start_up_times[i].usec;
+	for (i = 0; i < ARRAY_SIZE(odr_start_up_times[idx]); ++i) {
+		if (odr_start_up_times[idx][i].odr_bits == data->odr_bits)
+			return odr_start_up_times[idx][i].usec;
 	}
 
 	return KXCJK1013_MAX_STARTUP_TIME_US;
@@ -1074,10 +1126,21 @@ static irqreturn_t kxcjk1013_data_rdy_trig_poll(int irq, void *private)
 		return IRQ_HANDLED;
 }
 
-static int kxcjk1013_acpi_gpio_probe(struct i2c_client *client,
-				     struct kxcjk1013_data *data)
+static const char *kxcjk1013_match_acpi_device(struct device *dev,
+					       enum kx_chipset *chipset)
 {
 	const struct acpi_device_id *id;
+	id = acpi_match_device(dev->driver->acpi_match_table, dev);
+	if (!id)
+		return NULL;
+	*chipset = (enum kx_chipset)id->driver_data;
+
+	return dev_name(dev);
+}
+
+static int kxcjk1013_gpio_probe(struct i2c_client *client,
+				struct kxcjk1013_data *data)
+{
 	struct device *dev;
 	struct gpio_desc *gpio;
 	int ret;
@@ -1086,12 +1149,6 @@ static int kxcjk1013_acpi_gpio_probe(struct i2c_client *client,
 		return -EINVAL;
 
 	dev = &client->dev;
-	if (!ACPI_HANDLE(dev))
-		return -ENODEV;
-
-	id = acpi_match_device(dev->driver->acpi_match_table, dev);
-	if (!id)
-		return -ENODEV;
 
 	/* data ready gpio interrupt pin */
 	gpio = devm_gpiod_get_index(dev, "kxcjk1013_int", 0);
@@ -1117,6 +1174,7 @@ static int kxcjk1013_probe(struct i2c_client *client,
 	struct kxcjk1013_data *data;
 	struct iio_dev *indio_dev;
 	struct kxcjk_1013_platform_data *pdata;
+	const char *name;
 	int ret;
 
 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
@@ -1133,6 +1191,15 @@ static int kxcjk1013_probe(struct i2c_client *client,
 	else
 		data->active_high_intr = true; /* default polarity */
 
+	if (id) {
+		data->chipset = (enum kx_chipset)(id->driver_data);
+		name = id->name;
+	} else if (ACPI_HANDLE(&client->dev)) {
+		name = kxcjk1013_match_acpi_device(&client->dev,
+						   &data->chipset);
+	} else
+		return -ENODEV;
+
 	ret = kxcjk1013_chip_init(data);
 	if (ret < 0)
 		return ret;
@@ -1142,12 +1209,12 @@ static int kxcjk1013_probe(struct i2c_client *client,
 	indio_dev->dev.parent = &client->dev;
 	indio_dev->channels = kxcjk1013_channels;
 	indio_dev->num_channels = ARRAY_SIZE(kxcjk1013_channels);
-	indio_dev->name = KXCJK1013_DRV_NAME;
+	indio_dev->name = name;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->info = &kxcjk1013_info;
 
 	if (client->irq < 0)
-		client->irq = kxcjk1013_acpi_gpio_probe(client, data);
+		client->irq = kxcjk1013_gpio_probe(client, data);
 
 	if (client->irq >= 0) {
 		ret = devm_request_threaded_irq(&client->dev, client->irq,
@@ -1325,15 +1392,17 @@ static const struct dev_pm_ops kxcjk1013_pm_ops = {
 };
 
 static const struct acpi_device_id kx_acpi_match[] = {
-	{"KXCJ1013", 0},
-	{"KXCJ1008", 0},
+	{"KXCJ1013", KXCJK1013},
+	{"KXCJ1008", KXCJ91008},
+	{"KXTJ1009", KXTJ21009},
 	{ },
 };
 MODULE_DEVICE_TABLE(acpi, kx_acpi_match);
 
 static const struct i2c_device_id kxcjk1013_id[] = {
-	{"kxcjk1013", 0},
-	{"kxcj91008", 0},
+	{"kxcjk1013", KXCJK1013},
+	{"kxcj91008", KXCJ91008},
+	{"kxtj21009", KXTJ21009},
 	{}
 };