From: Kieran Bingham <kbingham@xxxxxxxxxx> 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@xxxxxxxxxx> Signed-off-by: Kieran Bingham <kbingham@xxxxxxxxxx> --- 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@xxxxxxxxxx> +F: drivers/auxdisplay/jhd1313.c + JME NETWORK DRIVER M: Guo-Fu Tseng <cooldavid@xxxxxxxxxxxxx> L: netdev@xxxxxxxxxxxxxxx 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@xxxxxxxxxx> + */ + +#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@xxxxxxxxxx>"); +MODULE_LICENSE("GPL"); -- 2.20.1
