From: Robin van der Gracht <robin@protonic.nl>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Rob Herring <robh+dt@kernel.org>, Miguel Ojeda <ojeda@kernel.org>,
Paul Burton <paulburton@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
devicetree@vger.kernel.org, linux-mips@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 16/17] auxdisplay: ht16k33: Add support for segment displays
Date: Mon, 29 Mar 2021 09:08:59 +0200 [thread overview]
Message-ID: <2868cd091dc6ff0cab14b5da07f89984@protonic.nl> (raw)
In-Reply-To: <20210322144848.1065067-17-geert@linux-m68k.org>
Hello Geert,
On 2021-03-22 15:48, Geert Uytterhoeven wrote:
> The Holtek HT16K33 LED controller is not only used for driving
> dot-matrix displays, but also for driving segment displays.
>
> Add support for 4-digit 7-segment and quad 14-segment alphanumeric
> displays, like the Adafruit 7-segment and 14-segment display backpack
> and FeatherWing expansion boards. Use the character line display core
> support to display a message, which will be scrolled if it doesn't fit.
>
> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
> ---
> The 7-segment support is based on schematics, and untested on actual
> hardware.
> ---
> drivers/auxdisplay/ht16k33.c | 198 +++++++++++++++++++++++++++++++++--
> 1 file changed, 191 insertions(+), 7 deletions(-)
>
...
>
> +static int ht16k33_seg_probe(struct i2c_client *client,
> + struct ht16k33_priv *priv, uint32_t brightness)
> +{
> + struct ht16k33_seg *seg = &priv->seg;
> + struct device *dev = &client->dev;
> + int err;
> +
> + err = ht16k33_brightness_set(priv, MAX_BRIGHTNESS);
> + if (err)
> + return err;
> +
> + switch (priv->type) {
> + case DISP_MATRIX:
> + /* not handled here */
> + break;
This 'case' shouldn't happen. Having said that, the break here will
still
cause the linedisp_register() function to be called for the DISP_MATRIX
type.
If you'd like to handle this case, a return (or setting 'err') should
prevent this.
> +
> + case DISP_QUAD_7SEG:
> + INIT_DELAYED_WORK(&priv->work, ht16k33_seg7_update);
> + seg->map.seg7 = initial_map_seg7;
> + seg->map_size = sizeof(seg->map.seg7);
> + err = device_create_file(dev, &dev_attr_map_seg7);
> + break;
> +
> + case DISP_QUAD_14SEG:
> + INIT_DELAYED_WORK(&priv->work, ht16k33_seg14_update);
> + seg->map.seg14 = initial_map_seg14;
> + seg->map_size = sizeof(seg->map.seg14);
> + err = device_create_file(dev, &dev_attr_map_seg14);
> + break;
> + }
> + if (err)
> + return err;
> +
> + err = linedisp_register(&seg->linedisp, dev, 4, seg->curr,
> + ht16k33_linedisp_update);
> + if (err)
> + goto err_remove_map_file;
> +
> + return 0;
Groetjes/Kind regards,
Robin van der Gracht
next prev parent reply other threads:[~2021-03-29 7:09 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-22 14:48 [PATCH 00/17] auxdisplay: ht16k33: Add character display support Geert Uytterhoeven
2021-03-22 14:48 ` [PATCH 01/17] uapi: Add <linux/map_to_14segment.h> Geert Uytterhoeven
2021-03-22 17:05 ` Miguel Ojeda
2021-03-22 17:51 ` Geert Uytterhoeven
2021-03-22 14:48 ` [PATCH 02/17] dt-bindings: auxdisplay: ht16k33: Document Adafruit segment displays Geert Uytterhoeven
2021-03-22 17:38 ` Rob Herring
2021-03-23 9:12 ` robin
2021-05-18 14:35 ` Geert Uytterhoeven
2021-05-19 10:37 ` Robin van der Gracht
2021-05-19 11:02 ` Geert Uytterhoeven
2021-03-22 14:48 ` [PATCH 03/17] auxdisplay: img-ascii-lcd: Fix lock-up when displaying empty string Geert Uytterhoeven
2021-03-22 14:48 ` [PATCH 04/17] auxdisplay: img-ascii-lcd: Add helper variable dev Geert Uytterhoeven
2021-03-22 16:59 ` Miguel Ojeda
2021-03-22 17:53 ` Geert Uytterhoeven
2021-03-22 14:48 ` [PATCH 05/17] auxdisplay: img-ascii-lcd: Convert device attribute to sysfs_emit() Geert Uytterhoeven
2021-03-22 14:48 ` [PATCH 06/17] auxdisplay: Extract character line display core support Geert Uytterhoeven
2021-03-23 8:18 ` robin
2021-03-23 8:52 ` Geert Uytterhoeven
2021-03-22 14:48 ` [PATCH 07/17] auxdisplay: linedisp: Use kmemdup_nul() helper Geert Uytterhoeven
2021-03-22 14:48 ` [PATCH 08/17] auxdisplay: linedisp: Add support for changing scroll rate Geert Uytterhoeven
2021-03-22 14:48 ` [PATCH 09/17] auxdisplay: ht16k33: Use HT16K33_FB_SIZE in ht16k33_initialize() Geert Uytterhoeven
2021-03-23 7:59 ` robin
2021-03-22 14:48 ` [PATCH 10/17] auxdisplay: ht16k33: Remove unneeded error check in keypad probe() Geert Uytterhoeven
2021-03-23 8:08 ` robin
2021-03-22 14:48 ` [PATCH 11/17] auxdisplay: ht16k33: Convert to simple i2c probe function Geert Uytterhoeven
2021-03-23 8:31 ` robin
2021-03-22 14:48 ` [PATCH 12/17] auxdisplay: ht16k33: Add helper variable dev Geert Uytterhoeven
2021-03-23 8:57 ` robin
2021-03-22 14:48 ` [PATCH 13/17] auxdisplay: ht16k33: Move delayed work Geert Uytterhoeven
2021-03-22 14:48 ` [PATCH 14/17] auxdisplay: ht16k33: Extract ht16k33_brightness_set() Geert Uytterhoeven
2021-03-22 14:48 ` [PATCH 15/17] auxdisplay: ht16k33: Extract frame buffer probing Geert Uytterhoeven
2021-03-22 14:48 ` [PATCH 16/17] auxdisplay: ht16k33: Add support for segment displays Geert Uytterhoeven
2021-03-29 7:08 ` Robin van der Gracht [this message]
2021-03-29 7:15 ` Geert Uytterhoeven
2021-03-29 7:30 ` Robin van der Gracht
2021-03-22 14:48 ` [PATCH 17/17] auxdisplay: ht16k33: Add segment display LED support Geert Uytterhoeven
2021-03-23 10:08 ` Robin van der Gracht
2021-03-23 12:32 ` Geert Uytterhoeven
2021-03-23 20:40 ` Pavel Machek
2021-03-24 8:31 ` Geert Uytterhoeven
2021-03-27 22:19 ` Pavel Machek
2021-06-25 12:39 ` Geert Uytterhoeven
2021-03-22 17:03 ` [PATCH 00/17] auxdisplay: ht16k33: Add character display support Miguel Ojeda
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