[U-Boot] [RFC PATCH 21/22] sandbox: serial: Support a coloured console

Simon Glass
2014-05-24T21:21:20Z

The current sandbox serial driver is a pretty trivial example and does not
have the featues that might be needed for other board serial drivers. To
help provide a better example, add a text colour property to the device
tree for sandbox. This uses platform data, a device tree node, driver
private data and a remove() method.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

drivers/serial/sandbox.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 83 insertions(+)

diff --git a/drivers/serial/sandbox.c b/drivers/serial/sandbox.c
index 3401752..d47f4f4 100644
--- a/drivers/serial/sandbox.c
+++ b/drivers/serial/sandbox.c
@@ -34,19 +34,67 @@ static char serial_buf[16];
static unsigned int serial_buf_write;
static unsigned int serial_buf_read;

+struct sandbox_serial_platdata {
+ int colour; /* Text colour to use for output, -1 for none */
+};
+
+struct sandbox_serial_priv {
+ bool start_of_line;
+};
+
+/**
+ * output_ansi_colour() - Output an ANSI colour code
+ *
+ * @colour: Colour to output (0-7)
+ */
+static void output_ansi_colour(int colour)
+{
+ char ansi_code[] = "\x1b[1;3Xm";
+
+ ansi_code[5] = '0' + colour;
+ os_write(1, ansi_code, sizeof(ansi_code) - 1);
+}
+
+static void output_ansi_reset(void)
+{
+ os_write(1, "\x1b[0m", 4);
+}
+
static int sandbox_serial_probe(struct device *dev)
{
struct sandbox_state *state = state_get_current();
+ struct sandbox_serial_priv *priv = dev_get_priv(dev);

if (state->term_raw != STATE_TERM_COOKED)
os_tty_raw(0, state->term_raw == STATE_TERM_RAW_WITH_SIGS);
+ priv->start_of_line = 0;
+
+ return 0;
+}
+
+static int sandbox_serial_remove(struct device *dev)
+{
+ struct sandbox_serial_platdata *plat = dev->platdata;
+
+ if (plat->colour != -1)
+ output_ansi_reset();

return 0;
}

static int sandbox_serial_putc(struct device *dev, const char ch)
{
+ struct sandbox_serial_priv *priv = dev_get_priv(dev);
+ struct sandbox_serial_platdata *plat = dev->platdata;
+
+ if (priv->start_of_line && plat->colour != -1) {
+ priv->start_of_line = false;
+ output_ansi_colour(plat->colour);
+ }
+
os_write(1, &ch, 1);
+ if (ch == '\n')
+ priv->start_of_line = true;

return 0;
}
@@ -91,6 +139,32 @@ static int sandbox_serial_getc(struct device *dev)
return result;
}

+static const char * const ansi_colour[] = {
+ "black", "red", "green", "yellow", "blue", "megenta", "cyan",
+ "white",
+};
+
+static int sandbox_serial_ofdata_to_platdata(struct device *dev)
+{
+ struct sandbox_serial_platdata *plat = dev->platdata;
+ const char *colour;
+ int i;
+
+ plat->colour = -1;
+ colour = fdt_getprop(gd->fdt_blob, dev->of_offset, "text-colour",
+ NULL);
+ if (colour) {
+ for (i = 0; i < ARRAY_SIZE(ansi_colour); i++) {
+ if (!strcmp(colour, ansi_colour[i])) {
+ plat->colour = i;
+ break;
+ }
+ }
+ }
+
+ return 0;
+}
+
static const struct dm_serial_ops sandbox_serial_ops = {
.putc = sandbox_serial_putc,
.pending = sandbox_serial_pending,
@@ -106,11 +180,20 @@ U_BOOT_DRIVER(serial_sandbox) = {
.name = "serial_sandbox",
.id = UCLASS_SERIAL,
.of_match = sandbox_serial_ids,
+ .ofdata_to_platdata = sandbox_serial_ofdata_to_platdata,
+ .platdata_auto_alloc_size = sizeof(struct sandbox_serial_platdata),
+ .priv_auto_alloc_size = sizeof(struct sandbox_serial_priv),
.probe = sandbox_serial_probe,
+ .remove = sandbox_serial_remove,
.ops = &sandbox_serial_ops,
.flags = DM_FLAG_PRE_RELOC,
};

+static const struct sandbox_serial_platdata platdata_non_fdt = {
+ .colour = -1,
+};
+
U_BOOT_DEVICE(serial_sandbox_non_fdt) = {
.name = "serial_sandbox",
+ .platdata = &platdata_non_fdt,
};
--
1.9.1.423.g4596e3a