mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![kernel test robot](/assets/img/avatar_default.png)
drivers/auxdisplay/lcd2s.c:373:3-8: No need to set .owner here. The core will do it.
Remove .owner field if calls are used which set it automatically
Generated by: scripts/coccinelle/api/platform_no_drv_owner.cocci
Fixes: 8c9108d014
("auxdisplay: add a driver for lcd2s character display")
CC: Lars Poeschel <poeschel@lemonage.de>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: kernel test robot <lkp@intel.com>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
402 lines
9 KiB
C
402 lines
9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* console driver for LCD2S 4x20 character displays connected through i2c.
|
|
* The display also has a spi interface, but the driver does not support
|
|
* this yet.
|
|
*
|
|
* This is a driver allowing you to use a LCD2S 4x20 from modtronix
|
|
* engineering as auxdisplay character device.
|
|
*
|
|
* (C) 2019 by Lemonage Software GmbH
|
|
* Author: Lars Pöschel <poeschel@lemonage.de>
|
|
* All rights reserved.
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include "charlcd.h"
|
|
|
|
#define LCD2S_CMD_CUR_MOVES_FWD 0x09
|
|
#define LCD2S_CMD_CUR_BLINK_OFF 0x10
|
|
#define LCD2S_CMD_CUR_UL_OFF 0x11
|
|
#define LCD2S_CMD_DISPLAY_OFF 0x12
|
|
#define LCD2S_CMD_CUR_BLINK_ON 0x18
|
|
#define LCD2S_CMD_CUR_UL_ON 0x19
|
|
#define LCD2S_CMD_DISPLAY_ON 0x1a
|
|
#define LCD2S_CMD_BACKLIGHT_OFF 0x20
|
|
#define LCD2S_CMD_BACKLIGHT_ON 0x28
|
|
#define LCD2S_CMD_WRITE 0x80
|
|
#define LCD2S_CMD_MOV_CUR_RIGHT 0x83
|
|
#define LCD2S_CMD_MOV_CUR_LEFT 0x84
|
|
#define LCD2S_CMD_SHIFT_RIGHT 0x85
|
|
#define LCD2S_CMD_SHIFT_LEFT 0x86
|
|
#define LCD2S_CMD_SHIFT_UP 0x87
|
|
#define LCD2S_CMD_SHIFT_DOWN 0x88
|
|
#define LCD2S_CMD_CUR_ADDR 0x89
|
|
#define LCD2S_CMD_CUR_POS 0x8a
|
|
#define LCD2S_CMD_CUR_RESET 0x8b
|
|
#define LCD2S_CMD_CLEAR 0x8c
|
|
#define LCD2S_CMD_DEF_CUSTOM_CHAR 0x92
|
|
#define LCD2S_CMD_READ_STATUS 0xd0
|
|
|
|
#define LCD2S_CHARACTER_SIZE 8
|
|
|
|
#define LCD2S_STATUS_BUF_MASK 0x7f
|
|
|
|
struct lcd2s_data {
|
|
struct i2c_client *i2c;
|
|
struct charlcd *charlcd;
|
|
};
|
|
|
|
static s32 lcd2s_wait_buf_free(const struct i2c_client *client, int count)
|
|
{
|
|
s32 status;
|
|
|
|
status = i2c_smbus_read_byte_data(client, LCD2S_CMD_READ_STATUS);
|
|
if (status < 0)
|
|
return status;
|
|
|
|
while ((status & LCD2S_STATUS_BUF_MASK) < count) {
|
|
mdelay(1);
|
|
status = i2c_smbus_read_byte_data(client,
|
|
LCD2S_CMD_READ_STATUS);
|
|
if (status < 0)
|
|
return status;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int lcd2s_i2c_master_send(const struct i2c_client *client,
|
|
const char *buf, int count)
|
|
{
|
|
s32 status;
|
|
|
|
status = lcd2s_wait_buf_free(client, count);
|
|
if (status < 0)
|
|
return status;
|
|
|
|
return i2c_master_send(client, buf, count);
|
|
}
|
|
|
|
static int lcd2s_i2c_smbus_write_byte(const struct i2c_client *client, u8 value)
|
|
{
|
|
s32 status;
|
|
|
|
status = lcd2s_wait_buf_free(client, 1);
|
|
if (status < 0)
|
|
return status;
|
|
|
|
return i2c_smbus_write_byte(client, value);
|
|
}
|
|
|
|
static int lcd2s_print(struct charlcd *lcd, int c)
|
|
{
|
|
struct lcd2s_data *lcd2s = lcd->drvdata;
|
|
u8 buf[2] = { LCD2S_CMD_WRITE, c };
|
|
|
|
lcd2s_i2c_master_send(lcd2s->i2c, buf, sizeof(buf));
|
|
return 0;
|
|
}
|
|
|
|
static int lcd2s_gotoxy(struct charlcd *lcd, unsigned int x, unsigned int y)
|
|
{
|
|
struct lcd2s_data *lcd2s = lcd->drvdata;
|
|
u8 buf[] = { LCD2S_CMD_CUR_POS, y + 1, x + 1};
|
|
|
|
lcd2s_i2c_master_send(lcd2s->i2c, buf, sizeof(buf));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int lcd2s_home(struct charlcd *lcd)
|
|
{
|
|
struct lcd2s_data *lcd2s = lcd->drvdata;
|
|
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CUR_RESET);
|
|
return 0;
|
|
}
|
|
|
|
static int lcd2s_init_display(struct charlcd *lcd)
|
|
{
|
|
struct lcd2s_data *lcd2s = lcd->drvdata;
|
|
|
|
/* turn everything off, but display on */
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_DISPLAY_ON);
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_BACKLIGHT_OFF);
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CUR_MOVES_FWD);
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CUR_BLINK_OFF);
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CUR_UL_OFF);
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CLEAR);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int lcd2s_shift_cursor(struct charlcd *lcd, enum charlcd_shift_dir dir)
|
|
{
|
|
struct lcd2s_data *lcd2s = lcd->drvdata;
|
|
|
|
if (dir == CHARLCD_SHIFT_LEFT)
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_MOV_CUR_LEFT);
|
|
else
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_MOV_CUR_RIGHT);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int lcd2s_shift_display(struct charlcd *lcd, enum charlcd_shift_dir dir)
|
|
{
|
|
struct lcd2s_data *lcd2s = lcd->drvdata;
|
|
|
|
if (dir == CHARLCD_SHIFT_LEFT)
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_SHIFT_LEFT);
|
|
else
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_SHIFT_RIGHT);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void lcd2s_backlight(struct charlcd *lcd, enum charlcd_onoff on)
|
|
{
|
|
struct lcd2s_data *lcd2s = lcd->drvdata;
|
|
|
|
if (on)
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_BACKLIGHT_ON);
|
|
else
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_BACKLIGHT_OFF);
|
|
}
|
|
|
|
static int lcd2s_display(struct charlcd *lcd, enum charlcd_onoff on)
|
|
{
|
|
struct lcd2s_data *lcd2s = lcd->drvdata;
|
|
|
|
if (on)
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_DISPLAY_ON);
|
|
else
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_DISPLAY_OFF);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int lcd2s_cursor(struct charlcd *lcd, enum charlcd_onoff on)
|
|
{
|
|
struct lcd2s_data *lcd2s = lcd->drvdata;
|
|
|
|
if (on)
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CUR_UL_ON);
|
|
else
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CUR_UL_OFF);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int lcd2s_blink(struct charlcd *lcd, enum charlcd_onoff on)
|
|
{
|
|
struct lcd2s_data *lcd2s = lcd->drvdata;
|
|
|
|
if (on)
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CUR_BLINK_ON);
|
|
else
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CUR_BLINK_OFF);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int lcd2s_fontsize(struct charlcd *lcd, enum charlcd_fontsize size)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int lcd2s_lines(struct charlcd *lcd, enum charlcd_lines lines)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int lcd2s_redefine_char(struct charlcd *lcd, char *esc)
|
|
{
|
|
/* Generator : LGcxxxxx...xx; must have <c> between '0'
|
|
* and '7', representing the numerical ASCII code of the
|
|
* redefined character, and <xx...xx> a sequence of 16
|
|
* hex digits representing 8 bytes for each character.
|
|
* Most LCDs will only use 5 lower bits of the 7 first
|
|
* bytes.
|
|
*/
|
|
|
|
struct lcd2s_data *lcd2s = lcd->drvdata;
|
|
u8 buf[LCD2S_CHARACTER_SIZE + 2] = { LCD2S_CMD_DEF_CUSTOM_CHAR };
|
|
u8 value;
|
|
int shift, i;
|
|
|
|
if (!strchr(esc, ';'))
|
|
return 0;
|
|
|
|
esc++;
|
|
|
|
buf[1] = *(esc++) - '0';
|
|
if (buf[1] > 7)
|
|
return 1;
|
|
|
|
i = 0;
|
|
shift = 0;
|
|
value = 0;
|
|
while (*esc && i < LCD2S_CHARACTER_SIZE + 2) {
|
|
int half;
|
|
|
|
shift ^= 4;
|
|
half = hex_to_bin(*esc++);
|
|
if (half < 0)
|
|
continue;
|
|
|
|
value |= half << shift;
|
|
if (shift == 0) {
|
|
buf[i++] = value;
|
|
value = 0;
|
|
}
|
|
}
|
|
|
|
lcd2s_i2c_master_send(lcd2s->i2c, buf, sizeof(buf));
|
|
return 1;
|
|
}
|
|
|
|
static int lcd2s_clear_display(struct charlcd *lcd)
|
|
{
|
|
struct lcd2s_data *lcd2s = lcd->drvdata;
|
|
|
|
/* This implicitly sets cursor to first row and column */
|
|
lcd2s_i2c_smbus_write_byte(lcd2s->i2c, LCD2S_CMD_CLEAR);
|
|
return 0;
|
|
}
|
|
|
|
static const struct charlcd_ops lcd2s_ops = {
|
|
.print = lcd2s_print,
|
|
.backlight = lcd2s_backlight,
|
|
.gotoxy = lcd2s_gotoxy,
|
|
.home = lcd2s_home,
|
|
.clear_display = lcd2s_clear_display,
|
|
.init_display = lcd2s_init_display,
|
|
.shift_cursor = lcd2s_shift_cursor,
|
|
.shift_display = lcd2s_shift_display,
|
|
.display = lcd2s_display,
|
|
.cursor = lcd2s_cursor,
|
|
.blink = lcd2s_blink,
|
|
.fontsize = lcd2s_fontsize,
|
|
.lines = lcd2s_lines,
|
|
.redefine_char = lcd2s_redefine_char,
|
|
};
|
|
|
|
static int lcd2s_i2c_probe(struct i2c_client *i2c,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct charlcd *lcd;
|
|
struct lcd2s_data *lcd2s;
|
|
int err;
|
|
|
|
if (!i2c_check_functionality(i2c->adapter,
|
|
I2C_FUNC_SMBUS_WRITE_BYTE_DATA |
|
|
I2C_FUNC_SMBUS_WRITE_BLOCK_DATA))
|
|
return -EIO;
|
|
|
|
/* Test, if the display is responding */
|
|
err = lcd2s_i2c_smbus_write_byte(i2c, LCD2S_CMD_DISPLAY_OFF);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
lcd = charlcd_alloc();
|
|
if (!lcd)
|
|
return -ENOMEM;
|
|
|
|
lcd2s = kzalloc(sizeof(struct lcd2s_data), GFP_KERNEL);
|
|
if (!lcd2s) {
|
|
err = -ENOMEM;
|
|
goto fail1;
|
|
}
|
|
|
|
lcd->drvdata = lcd2s;
|
|
lcd2s->i2c = i2c;
|
|
lcd2s->charlcd = lcd;
|
|
|
|
/* Required properties */
|
|
err = device_property_read_u32(&i2c->dev, "display-height-chars",
|
|
&lcd->height);
|
|
if (err)
|
|
goto fail2;
|
|
|
|
err = device_property_read_u32(&i2c->dev, "display-width-chars",
|
|
&lcd->width);
|
|
if (err)
|
|
goto fail2;
|
|
|
|
lcd->ops = &lcd2s_ops;
|
|
|
|
err = charlcd_register(lcd2s->charlcd);
|
|
if (err)
|
|
goto fail2;
|
|
|
|
i2c_set_clientdata(i2c, lcd2s);
|
|
return 0;
|
|
|
|
fail2:
|
|
kfree(lcd2s);
|
|
fail1:
|
|
kfree(lcd);
|
|
return err;
|
|
}
|
|
|
|
static int lcd2s_i2c_remove(struct i2c_client *i2c)
|
|
{
|
|
struct lcd2s_data *lcd2s = i2c_get_clientdata(i2c);
|
|
|
|
charlcd_unregister(lcd2s->charlcd);
|
|
kfree(lcd2s->charlcd);
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id lcd2s_i2c_id[] = {
|
|
{ "lcd2s", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, lcd2s_i2c_id);
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id lcd2s_of_table[] = {
|
|
{ .compatible = "modtronix,lcd2s" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, lcd2s_of_table);
|
|
#endif
|
|
|
|
static struct i2c_driver lcd2s_i2c_driver = {
|
|
.driver = {
|
|
.name = "lcd2s",
|
|
#ifdef CONFIG_OF
|
|
.of_match_table = of_match_ptr(lcd2s_of_table),
|
|
#endif
|
|
},
|
|
.probe = lcd2s_i2c_probe,
|
|
.remove = lcd2s_i2c_remove,
|
|
.id_table = lcd2s_i2c_id,
|
|
};
|
|
|
|
static int __init lcd2s_modinit(void)
|
|
{
|
|
int ret = 0;
|
|
|
|
ret = i2c_add_driver(&lcd2s_i2c_driver);
|
|
if (ret != 0)
|
|
pr_err("Failed to register lcd2s driver\n");
|
|
|
|
return ret;
|
|
}
|
|
module_init(lcd2s_modinit)
|
|
|
|
static void __exit lcd2s_exit(void)
|
|
{
|
|
i2c_del_driver(&lcd2s_i2c_driver);
|
|
}
|
|
module_exit(lcd2s_exit)
|
|
|
|
MODULE_DESCRIPTION("LCD2S character display driver");
|
|
MODULE_AUTHOR("Lars Poeschel");
|
|
MODULE_LICENSE("GPL");
|