From: Axel Haslam <ahaslam@baylibre.com>

Include a chip info struct in device SPI and device OF match tables to
provide channel definitions for each particular ADC model and drop
device enum.

Suggested-by: Nuno Sa <nuno.sa@analog.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Axel Haslam <ahaslam@baylibre.com>
---
 drivers/iio/dac/ad5791.c | 110 +++++++++++++++++++--------------------
 1 file changed, 53 insertions(+), 57 deletions(-)

diff --git a/drivers/iio/dac/ad5791.c b/drivers/iio/dac/ad5791.c
index 553431bf0232..f6b9a40241f3 100644
--- a/drivers/iio/dac/ad5791.c
+++ b/drivers/iio/dac/ad5791.c
@@ -61,11 +61,14 @@
 
 /**
  * struct ad5791_chip_info - chip specific information
+ * @name:		name of the dac chip
+ * @channel:		channel specification
  * @get_lin_comp:	function pointer to the device specific function
  */
-
 struct ad5791_chip_info {
-	int (*get_lin_comp)	(unsigned int span);
+	const char *name;
+	const struct iio_chan_spec channel;
+	int (*get_lin_comp)(unsigned int span);
 };
 
 /**
@@ -98,13 +101,6 @@ struct ad5791_state {
 	} data[3] __aligned(IIO_DMA_MINALIGN);
 };
 
-enum ad5791_supported_device_ids {
-	ID_AD5760,
-	ID_AD5780,
-	ID_AD5781,
-	ID_AD5791,
-};
-
 static int ad5791_spi_write(struct ad5791_state *st, u8 addr, u32 val)
 {
 	st->data[0].d32 = cpu_to_be32(AD5791_CMD_WRITE |
@@ -228,20 +224,6 @@ static int ad5780_get_lin_comp(unsigned int span)
 	else
 		return AD5780_LINCOMP_10_20;
 }
-static const struct ad5791_chip_info ad5791_chip_info_tbl[] = {
-	[ID_AD5760] = {
-		.get_lin_comp = ad5780_get_lin_comp,
-	},
-	[ID_AD5780] = {
-		.get_lin_comp = ad5780_get_lin_comp,
-	},
-	[ID_AD5781] = {
-		.get_lin_comp = ad5791_get_lin_comp,
-	},
-	[ID_AD5791] = {
-		.get_lin_comp = ad5791_get_lin_comp,
-	},
-};
 
 static int ad5791_read_raw(struct iio_dev *indio_dev,
 			   struct iio_chan_spec const *chan,
@@ -289,30 +271,34 @@ static const struct iio_chan_spec_ext_info ad5791_ext_info[] = {
 	{ },
 };
 
-#define AD5791_CHAN(bits, _shift) {			\
-	.type = IIO_VOLTAGE,				\
-	.output = 1,					\
-	.indexed = 1,					\
-	.address = AD5791_ADDR_DAC0,			\
-	.channel = 0,					\
-	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),	\
-	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |	\
-		BIT(IIO_CHAN_INFO_OFFSET),		\
-	.scan_type = {					\
-		.sign = 'u',				\
-		.realbits = (bits),			\
-		.storagebits = 24,			\
-		.shift = (_shift),			\
-	},						\
-	.ext_info = ad5791_ext_info,			\
+#define AD5791_DEFINE_CHIP_INFO(_name, bits, _shift, _lin_comp)		\
+static const struct ad5791_chip_info _name##_chip_info = {		\
+	.name = #_name,							\
+	.get_lin_comp = &(_lin_comp),					\
+	.channel = {							\
+			.type = IIO_VOLTAGE,				\
+			.output = 1,					\
+			.indexed = 1,					\
+			.address = AD5791_ADDR_DAC0,			\
+			.channel = 0,					\
+			.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),	\
+			.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |	\
+				BIT(IIO_CHAN_INFO_OFFSET),		\
+			.scan_type = {					\
+				.sign = 'u',				\
+				.realbits = (bits),			\
+				.storagebits = 24,			\
+				.shift = (_shift),			\
+			},						\
+			.ext_info = ad5791_ext_info,			\
+	},								\
 }
 
-static const struct iio_chan_spec ad5791_channels[] = {
-	[ID_AD5760] = AD5791_CHAN(16, 4),
-	[ID_AD5780] = AD5791_CHAN(18, 2),
-	[ID_AD5781] = AD5791_CHAN(18, 2),
-	[ID_AD5791] = AD5791_CHAN(20, 0)
-};
+AD5791_DEFINE_CHIP_INFO(ad5760, 16, 4, ad5780_get_lin_comp);
+AD5791_DEFINE_CHIP_INFO(ad5780, 18, 2, ad5780_get_lin_comp);
+AD5791_DEFINE_CHIP_INFO(ad5781, 18, 2, ad5791_get_lin_comp);
+AD5791_DEFINE_CHIP_INFO(ad5790, 20, 0, ad5791_get_lin_comp);
+AD5791_DEFINE_CHIP_INFO(ad5791, 20, 0, ad5791_get_lin_comp);
 
 static int ad5791_write_raw(struct iio_dev *indio_dev,
 			    struct iio_chan_spec const *chan,
@@ -400,9 +386,9 @@ static int ad5791_probe(struct spi_device *spi)
 	if (ret)
 		goto error_disable_reg_neg;
 
-	st->chip_info =	&ad5791_chip_info_tbl[spi_get_device_id(spi)
-					      ->driver_data];
-
+	st->chip_info = spi_get_device_match_data(spi);
+	if (!st->chip_info)
+		return dev_err_probe(&spi->dev, -EINVAL, "no chip info\n");
 
 	st->ctrl = AD5761_CTRL_LINCOMP(st->chip_info->get_lin_comp(st->vref_mv))
 		  | (use_rbuf_gain2 ? 0 : AD5791_CTRL_RBUF) |
@@ -416,10 +402,9 @@ static int ad5791_probe(struct spi_device *spi)
 	spi_set_drvdata(spi, indio_dev);
 	indio_dev->info = &ad5791_info;
 	indio_dev->modes = INDIO_DIRECT_MODE;
-	indio_dev->channels
-		= &ad5791_channels[spi_get_device_id(spi)->driver_data];
+	indio_dev->channels = &st->chip_info->channel;
 	indio_dev->num_channels = 1;
-	indio_dev->name = spi_get_device_id(st->spi)->name;
+	indio_dev->name = st->chip_info->name;
 	ret = iio_device_register(indio_dev);
 	if (ret)
 		goto error_disable_reg_neg;
@@ -448,19 +433,30 @@ static void ad5791_remove(struct spi_device *spi)
 		regulator_disable(st->reg_vss);
 }
 
+static const struct of_device_id ad5791_of_match[] = {
+	{ .compatible = "adi,ad5760", .data = &ad5760_chip_info },
+	{ .compatible = "adi,ad5780", .data = &ad5780_chip_info },
+	{ .compatible = "adi,ad5781", .data = &ad5781_chip_info },
+	{ .compatible = "adi,ad5790", .data = &ad5790_chip_info },
+	{ .compatible = "adi,ad5791", .data = &ad5791_chip_info },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ad5791_of_match);
+
 static const struct spi_device_id ad5791_id[] = {
-	{"ad5760", ID_AD5760},
-	{"ad5780", ID_AD5780},
-	{"ad5781", ID_AD5781},
-	{"ad5790", ID_AD5791},
-	{"ad5791", ID_AD5791},
-	{}
+	{ "ad5760", (kernel_ulong_t)&ad5760_chip_info },
+	{ "ad5780", (kernel_ulong_t)&ad5780_chip_info },
+	{ "ad5781", (kernel_ulong_t)&ad5781_chip_info },
+	{ "ad5790", (kernel_ulong_t)&ad5790_chip_info },
+	{ "ad5791", (kernel_ulong_t)&ad5791_chip_info },
+	{ }
 };
 MODULE_DEVICE_TABLE(spi, ad5791_id);
 
 static struct spi_driver ad5791_driver = {
 	.driver = {
 		   .name = "ad5791",
+		   .of_match_table = ad5791_of_match,
 		   },
 	.probe = ad5791_probe,
 	.remove = ad5791_remove,
-- 
2.34.1