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Date: Thu, 28 Nov 2019 10:55:08 +0000
From: kbingham@...nel.org
To: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
Rob Herring <robh+dt@...nel.org>,
Miguel Ojeda Sandonis <miguel.ojeda.sandonis@...il.com>,
Simon Goda <simon.goda@...los.com>
Cc: Kieran Bingham <kbingham@...nel.org>
Subject: [PATCH 3/3] drivers: auxdisplay: Add JHD1313 I2C interface driver
From: Kieran Bingham <kbingham@...nel.org>
Provide an auxdisplay driver for the JHD1313 as used by the Grove-LCD
RGB Backlight module [0]. A datasheet for the JHD1214 is provided by
seeed [1], which assumes that they are similar parts.
The backlight for the Grove-LCD is already controllable with the PCA963x
driver.
[0] http://wiki.seeedstudio.com/Grove-LCD_RGB_Backlight/
[1] https://seeeddoc.github.io/Grove-LCD_RGB_Backlight/res/JHD1214Y_YG_1.0.pdf
Signed-off-by: Simon Goda <simon.goda@...los.com>
Signed-off-by: Kieran Bingham <kbingham@...nel.org>
---
MAINTAINERS | 4 ++
drivers/auxdisplay/Kconfig | 12 ++++
drivers/auxdisplay/Makefile | 1 +
drivers/auxdisplay/jhd1313.c | 111 +++++++++++++++++++++++++++++++++++
4 files changed, 128 insertions(+)
create mode 100644 drivers/auxdisplay/jhd1313.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 8f075b866aaf..640f099ff7fb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8837,6 +8837,10 @@ S: Maintained
F: Documentation/admin-guide/jfs.rst
F: fs/jfs/
+JHD1313 LCD Dispaly driver
+M: Kieran Bingham <kbingham@...nel.org>
+F: drivers/auxdisplay/jhd1313.c
+
JME NETWORK DRIVER
M: Guo-Fu Tseng <cooldavid@...ldavid.org>
L: netdev@...r.kernel.org
diff --git a/drivers/auxdisplay/Kconfig b/drivers/auxdisplay/Kconfig
index b8313a04422d..cfc61c1abdee 100644
--- a/drivers/auxdisplay/Kconfig
+++ b/drivers/auxdisplay/Kconfig
@@ -27,6 +27,18 @@ config HD44780
kernel and started at boot.
If you don't understand what all this is about, say N.
+config JHD1313
+ tristate "JHD1313 Character LCD support"
+ depends on I2C
+ select CHARLCD
+ ---help---
+ Enable support for Character LCDs using a JHD1313 controller on I2C.
+ The LCD is accessible through the /dev/lcd char device (10, 156).
+ This code can either be compiled as a module, or linked into the
+ kernel and started at boot.
+ This supports the LCD panel on the Grove 16x2 LCD series.
+ If you don't understand what all this is about, say N.
+
config KS0108
tristate "KS0108 LCD Controller"
depends on PARPORT_PC
diff --git a/drivers/auxdisplay/Makefile b/drivers/auxdisplay/Makefile
index cf54b5efb07e..6e1405a61925 100644
--- a/drivers/auxdisplay/Makefile
+++ b/drivers/auxdisplay/Makefile
@@ -9,5 +9,6 @@ obj-$(CONFIG_KS0108) += ks0108.o
obj-$(CONFIG_CFAG12864B) += cfag12864b.o cfag12864bfb.o
obj-$(CONFIG_IMG_ASCII_LCD) += img-ascii-lcd.o
obj-$(CONFIG_HD44780) += hd44780.o
+obj-$(CONFIG_JHD1313) += jhd1313.o
obj-$(CONFIG_HT16K33) += ht16k33.o
obj-$(CONFIG_PARPORT_PANEL) += panel.o
diff --git a/drivers/auxdisplay/jhd1313.c b/drivers/auxdisplay/jhd1313.c
new file mode 100644
index 000000000000..abf270e128ac
--- /dev/null
+++ b/drivers/auxdisplay/jhd1313.c
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * JHD1313 I2C Character LCD driver for Linux.
+ *
+ * Kieran Bingham <kbingham@...nel.org>
+ */
+
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+
+#include <linux/i2c.h>
+
+#include "charlcd.h"
+
+struct jhd1313 {
+ struct i2c_client *client;
+};
+
+static void jhd1313_write_cmd(struct charlcd *lcd, int cmd)
+{
+ struct jhd1313 *jhd = lcd->drvdata;
+ struct i2c_client *client = jhd->client;
+
+ i2c_smbus_write_byte_data(client, 0x00, cmd);
+}
+
+static void jhd1313_write_data(struct charlcd *lcd, int data)
+{
+ struct jhd1313 *jhd = lcd->drvdata;
+ struct i2c_client *client = jhd->client;
+
+ i2c_smbus_write_byte_data(client, 0x40, data);
+}
+
+static const struct charlcd_ops jhd1313_ops = {
+ .write_cmd = jhd1313_write_cmd,
+ .write_data = jhd1313_write_data,
+};
+
+static int jhd1313_probe(struct i2c_client *client)
+{
+ struct charlcd *lcd;
+ struct jhd1313 *jhd;
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {
+ dev_err(&client->dev, "i2c_check_functionality error\n");
+ return -EIO;
+ }
+
+ lcd = charlcd_alloc(sizeof(struct jhd1313));
+ if (!lcd)
+ return -ENOMEM;
+
+ jhd = lcd->drvdata;
+ i2c_set_clientdata(client, lcd);
+ jhd->client = client;
+
+ lcd->width = 16;
+ lcd->height = 2;
+ lcd->ifwidth = 8;
+ lcd->ops = &jhd1313_ops;
+
+ ret = charlcd_register(lcd);
+ if (ret) {
+ charlcd_free(lcd);
+ dev_err(&client->dev, "Failed to register JHD1313");
+ }
+
+ return ret;
+}
+
+static int jhd1313_remove(struct i2c_client *client)
+{
+ struct charlcd *lcd = i2c_get_clientdata(client);
+
+ charlcd_unregister(lcd);
+ charlcd_free(lcd);
+
+ return 0;
+}
+
+static const struct i2c_device_id jhd1313_id[] = {
+ { "jhd1313", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, jhd1313_id);
+
+static const struct of_device_id jhd1313_of_table[] = {
+ { .compatible = "jhd,jhd1313" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, jhd1313_of_table);
+
+static struct i2c_driver jhd1313_driver = {
+ .driver = {
+ .name = "jhd1313",
+ .of_match_table = jhd1313_of_table,
+ },
+ .probe_new = jhd1313_probe,
+ .remove = jhd1313_remove,
+ .id_table = jhd1313_id,
+};
+
+module_i2c_driver(jhd1313_driver);
+
+MODULE_DESCRIPTION("JHD1313 I2C Character LCD driver");
+MODULE_AUTHOR("Kieran Bingham <kbingham@...nel.org>");
+MODULE_LICENSE("GPL");
--
2.20.1
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