media: video-i2c: add Melexis MLX90640 thermal camera

Add initial support for MLX90640 thermal cameras which output an 32x24
greyscale pixel image along with 2 rows of coefficent data.

Because of this the data outputed is really 32x26 and needs the two rows
removed after using the coefficent information to generate processed
images in userspace.

Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 119aaee5318b6693b9ecc465fc96967d170b50c8..e6cd5cf7c3d99d8f24c36058b5e6c0b61e1a16bc 100644 (file)
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -1107,6 +1107,7 @@ config VIDEO_I2C
          Enable the I2C transport video support which supports the
          following:
           * Panasonic AMG88xx Grid-Eye Sensors
+          * Melexis MLX90640 Thermal Cameras
 
          To compile this driver as a module, choose M here: the
          module will be called video-i2c

diff --git a/drivers/media/i2c/video-i2c.c b/drivers/media/i2c/video-i2c.c
index 01dcf179f203e6c713910b294870cb8fcabbad02..abd3152df7d01fd1a20e196134544763f5f2766d 100644 (file)
--- a/drivers/media/i2c/video-i2c.c
+++ b/drivers/media/i2c/video-i2c.c
@@ -6,6 +6,7 @@
  *
  * Supported:
  * - Panasonic AMG88xx Grid-Eye Sensors
+ * - Melexis MLX90640 Thermal Cameras
  */
 
 #include <linux/delay.h>
@@ -18,6 +19,7 @@
 #include <linux/mutex.h>
 #include <linux/of_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/nvmem-provider.h>
 #include <linux/regmap.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
@@ -66,12 +68,26 @@ static const struct v4l2_frmsize_discrete amg88xx_size = {
        .height = 8,
 };
 
+static const struct v4l2_fmtdesc mlx90640_format = {
+       .pixelformat = V4L2_PIX_FMT_Y16_BE,
+};
+
+static const struct v4l2_frmsize_discrete mlx90640_size = {
+       .width = 32,
+       .height = 26, /* 24 lines of pixel data + 2 lines of processing data */
+};
+
 static const struct regmap_config amg88xx_regmap_config = {
        .reg_bits = 8,
        .val_bits = 8,
        .max_register = 0xff
 };
 
+static const struct regmap_config mlx90640_regmap_config = {
+       .reg_bits = 16,
+       .val_bits = 16,
+};
+
 struct video_i2c_chip {
        /* video dimensions */
        const struct v4l2_fmtdesc *format;
@@ -88,6 +104,7 @@ struct video_i2c_chip {
        unsigned int bpp;
 
        const struct regmap_config *regmap_config;
+       struct nvmem_config *nvmem_config;
 
        /* setup function */
        int (*setup)(struct video_i2c_data *data);
@@ -102,6 +119,22 @@ struct video_i2c_chip {
        int (*hwmon_init)(struct video_i2c_data *data);
 };
 
+static int mlx90640_nvram_read(void *priv, unsigned int offset, void *val,
+                            size_t bytes)
+{
+       struct video_i2c_data *data = priv;
+
+       return regmap_bulk_read(data->regmap, 0x2400 + offset, val, bytes);
+}
+
+static struct nvmem_config mlx90640_nvram_config = {
+       .name = "mlx90640_nvram",
+       .word_size = 2,
+       .stride = 1,
+       .size = 1664,
+       .reg_read = mlx90640_nvram_read,
+};
+
 /* Power control register */
 #define AMG88XX_REG_PCTL       0x00
 #define AMG88XX_PCTL_NORMAL            0x00
@@ -122,12 +155,23 @@ struct video_i2c_chip {
 /* Temperature register */
 #define AMG88XX_REG_T01L       0x80
 
+/* Control register */
+#define MLX90640_REG_CTL1              0x800d
+#define MLX90640_REG_CTL1_MASK         0x0380
+#define MLX90640_REG_CTL1_MASK_SHIFT   7
+
 static int amg88xx_xfer(struct video_i2c_data *data, char *buf)
 {
        return regmap_bulk_read(data->regmap, AMG88XX_REG_T01L, buf,
                                data->chip->buffer_size);
 }
 
+static int mlx90640_xfer(struct video_i2c_data *data, char *buf)
+{
+       return regmap_bulk_read(data->regmap, 0x400, buf,
+                               data->chip->buffer_size);
+}
+
 static int amg88xx_setup(struct video_i2c_data *data)
 {
        unsigned int mask = AMG88XX_FPSC_1FPS;
@@ -141,6 +185,27 @@ static int amg88xx_setup(struct video_i2c_data *data)
        return regmap_update_bits(data->regmap, AMG88XX_REG_FPSC, mask, val);
 }
 
+static int mlx90640_setup(struct video_i2c_data *data)
+{
+       unsigned int n, idx;
+
+       for (n = 0; n < data->chip->num_frame_intervals - 1; n++) {
+               if (data->frame_interval.numerator
+                               != data->chip->frame_intervals[n].numerator)
+                       continue;
+
+               if (data->frame_interval.denominator
+                               == data->chip->frame_intervals[n].denominator)
+                       break;
+       }
+
+       idx = data->chip->num_frame_intervals - n - 1;
+
+       return regmap_update_bits(data->regmap, MLX90640_REG_CTL1,
+                                 MLX90640_REG_CTL1_MASK,
+                                 idx << MLX90640_REG_CTL1_MASK_SHIFT);
+}
+
 static int amg88xx_set_power_on(struct video_i2c_data *data)
 {
        int ret;
@@ -274,13 +339,27 @@ static int amg88xx_hwmon_init(struct video_i2c_data *data)
 #define        amg88xx_hwmon_init      NULL
 #endif
 
-#define AMG88XX                0
+enum {
+       AMG88XX,
+       MLX90640,
+};
 
 static const struct v4l2_fract amg88xx_frame_intervals[] = {
        { 1, 10 },
        { 1, 1 },
 };
 
+static const struct v4l2_fract mlx90640_frame_intervals[] = {
+       { 1, 64 },
+       { 1, 32 },
+       { 1, 16 },
+       { 1, 8 },
+       { 1, 4 },
+       { 1, 2 },
+       { 1, 1 },
+       { 2, 1 },
+};
+
 static const struct video_i2c_chip video_i2c_chip[] = {
        [AMG88XX] = {
                .size           = &amg88xx_size,
@@ -295,6 +374,18 @@ static const struct video_i2c_chip video_i2c_chip[] = {
                .set_power      = amg88xx_set_power,
                .hwmon_init     = amg88xx_hwmon_init,
        },
+       [MLX90640] = {
+               .size           = &mlx90640_size,
+               .format         = &mlx90640_format,
+               .frame_intervals        = mlx90640_frame_intervals,
+               .num_frame_intervals    = ARRAY_SIZE(mlx90640_frame_intervals),
+               .buffer_size    = 1664,
+               .bpp            = 16,
+               .regmap_config  = &mlx90640_regmap_config,
+               .nvmem_config   = &mlx90640_nvram_config,
+               .setup          = mlx90640_setup,
+               .xfer           = mlx90640_xfer,
+       },
 };
 
 static const struct v4l2_file_operations video_i2c_fops = {
@@ -756,6 +847,21 @@ static int video_i2c_probe(struct i2c_client *client,
                }
        }
 
+       if (data->chip->nvmem_config) {
+               struct nvmem_config *config = data->chip->nvmem_config;
+               struct nvmem_device *device;
+
+               config->priv = data;
+               config->dev = &client->dev;
+
+               device = devm_nvmem_register(&client->dev, config);
+
+               if (IS_ERR(device)) {
+                       dev_warn(&client->dev,
+                                "failed to register nvmem device\n");
+               }
+       }
+
        ret = video_register_device(&data->vdev, VFL_TYPE_GRABBER, -1);
        if (ret < 0)
                goto error_pm_disable;
@@ -835,12 +941,14 @@ static const struct dev_pm_ops video_i2c_pm_ops = {
 
 static const struct i2c_device_id video_i2c_id_table[] = {
        { "amg88xx", AMG88XX },
+       { "mlx90640", MLX90640 },
        {}
 };
 MODULE_DEVICE_TABLE(i2c, video_i2c_id_table);
 
 static const struct of_device_id video_i2c_of_match[] = {
        { .compatible = "panasonic,amg88xx", .data = &video_i2c_chip[AMG88XX] },
+       { .compatible = "melexis,mlx90640", .data = &video_i2c_chip[MLX90640] },
        {}
 };
 MODULE_DEVICE_TABLE(of, video_i2c_of_match);