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tm16xx.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Auxiliary Display Driver for TM16XX and compatible LED controllers
*
* Copyright (C) 2024 Jean-François Lessard
*
* This driver supports various LED controller chips, including TM16XX family,
* FD6XX family, PT6964, and HBS658. It provides support for both I2C and SPI interfaces.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/spi/spi.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/leds.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/map_to_7segment.h>
#define TM16XX_DRIVER_NAME "tm16xx"
#define TM16XX_DEVICE_NAME "display"
#define DIGIT_SEGMENTS 7
#define MIN_SEGMENT 0
#define MAX_SEGMENT 7 /* data stored as 8 bits (u8) */
/* Forward declarations */
struct tm16xx_display;
/**
* struct tm16xx_controller - Controller-specific operations
* @max_brightness: Maximum brightness level supported by the controller
* @init: Configures the controller mode and brightness
* @data: Writes display data to the controller
*
* This structure holds function pointers for controller-specific operations.
*/
struct tm16xx_controller {
const u8 max_brightness;
const int (*init)(struct tm16xx_display *display);
const int (*data)(struct tm16xx_display *display, u8 index, u8 data);
};
/**
* struct tm16xx_led - LED information
* @cdev: LED class device
* @grid: Grid index of the LED
* @segment: Segment index of the LED
*/
struct tm16xx_led {
struct led_classdev cdev;
u8 grid;
u8 segment;
};
/**
* struct tm16xx_digit - Digit information
* @grid: Grid index of the digit
* @value: Current value of the digit
*/
struct tm16xx_digit {
u8 grid;
char value;
};
/**
* struct tm16xx_display - Main driver structure
* @dev: Pointer to device structure
* @controller: Pointer to controller-specific operations
* @client: Union of I2C and SPI client structures
* @main_led: LED class device for the entire display
* @leds: Array of individual LEDs
* @num_leds: Number of LEDs
* @digits: Array of digits
* @num_digits: Number of digits
* @segment_mapping: Segment mapping array
* @digit_bitmask: Bitmask for setting digit values
* @display_data: Display data buffer
* @display_data_len: Length of display data buffer
* @lock: Mutex for concurrent access protection
* @flush_init: Work structure for brightness update
* @flush_display: Work structure for display update
* @flush_status: Result of the last flush work
* @transpose_display_data: Flag indicating if segments and grids should be transposed when writing data
*/
struct tm16xx_display {
struct device *dev;
const struct tm16xx_controller *controller;
union {
struct i2c_client *i2c;
struct spi_device *spi;
} client;
struct led_classdev main_led;
struct tm16xx_led *leds;
int num_leds;
struct tm16xx_digit *digits;
int num_digits;
u8 segment_mapping[DIGIT_SEGMENTS];
u8 digit_bitmask;
u8 *display_data;
size_t display_data_len;
struct mutex lock;
struct work_struct flush_init;
struct work_struct flush_display;
int flush_status;
bool transpose_display_data;
};
/**
* tm16xx_i2c_write - Write data to I2C client
* @display: Pointer to tm16xx_display structure
* @data: Data to write
* @len: Length of data
*
* Return: Number of bytes written or negative error code
*/
static int tm16xx_i2c_write(struct tm16xx_display *display, u8 *data, size_t len)
{
dev_dbg(display->dev, "i2c_write %*ph", (char)len, data);
struct i2c_msg msg = {
.addr = data[0] >> 1,
.flags = 0,
.len = len - 1,
.buf = &data[1],
};
int ret;
ret = i2c_transfer(display->client.i2c->adapter, &msg, 1);
if (ret < 0)
return ret;
return (ret == 1) ? len : -EIO;
}
/**
* tm16xx_spi_write - Write data to SPI client
* @display: Pointer to tm16xx_display structure
* @data: Data to write
* @len: Length of data
*
* Return: Number of bytes written or negative error code
*/
static int tm16xx_spi_write(struct tm16xx_display *display, u8 *data, size_t len)
{
dev_dbg(display->dev, "spi_write %*ph", (char)len, data);
struct spi_device *spi = display->client.spi;
return spi_write(spi, data, len);
}
/* Controller-specific functions */
static int tm1628_init(struct tm16xx_display *display)
{
static const u8 MODE_CMD = 0 << 7 | 0 << 6;
static const u8 MODE_4GRIDS = 0 << 1 | 0 << 0;
static const u8 MODE_5GRIDS = 0 << 1 | 1 << 0;
static const u8 MODE_6GRIDS = 1 << 1 | 0 << 0;
static const u8 MODE_7GRIDS = 1 << 1 | 1 << 0;
static const u8 DATA_CMD = 0 << 7 | 1 << 6, DATA_ADDR_MODE = 0 << 2, DATA_WRITE_MODE = 0 << 1 | 0 << 0;
static const u8 CTRL_CMD = 1 << 7 | 0 << 6, ON_FLAG = 1 << 3, BR_MASK = 7, BR_SHIFT = 0;
const enum led_brightness brightness = display->main_led.brightness;
const u8 num_grids = display->transpose_display_data ? DIGIT_SEGMENTS : display->display_data_len;
u8 cmd;
int ret;
cmd = MODE_CMD;
if (num_grids <= 4) {
cmd |= MODE_4GRIDS;
} else if (num_grids == 5) {
cmd |= MODE_5GRIDS;
} else if (num_grids == 6) {
cmd |= MODE_6GRIDS;
} else {
cmd |= MODE_7GRIDS;
}
ret = tm16xx_spi_write(display, &cmd, 1);
if (ret < 0)
return ret;
cmd = DATA_CMD | DATA_ADDR_MODE | DATA_WRITE_MODE;
ret = tm16xx_spi_write(display, &cmd, 1);
if (ret < 0)
return ret;
cmd = CTRL_CMD | ((brightness && 1) * (((brightness-1) & BR_MASK) << BR_SHIFT | ON_FLAG));
ret = tm16xx_spi_write(display, &cmd, 1);
if (ret < 0)
return ret;
return 0;
}
static int tm1618_data(struct tm16xx_display *display, u8 index, u8 data) {
static const u8 ADDR_CMD = 1 << 7 | 1 << 6;
static const u8 BYTE1_MASK = 0x1F, BYTE1_RSHIFT = 0;
static const u8 BYTE2_MASK = ~BYTE1_MASK, BYTE2_RSHIFT = 5-3;
u8 cmds[3];
cmds[0] = ADDR_CMD + index * 2;
cmds[1] = (data & BYTE1_MASK) >> BYTE1_RSHIFT;
cmds[2] = (data & BYTE2_MASK) >> BYTE2_RSHIFT;
return tm16xx_spi_write(display, cmds, ARRAY_SIZE(cmds));
}
static int tm1628_data(struct tm16xx_display *display, u8 index, u8 data) {
static const u8 ADDR_CMD = 1 << 7 | 1 << 6;
u8 cmds[3];
cmds[0] = ADDR_CMD + index * 2;
cmds[1] = data; // SEG 1 to 8
cmds[2] = 0; // SEG 9 to 14
return tm16xx_spi_write(display, cmds, ARRAY_SIZE(cmds));
}
static int tm1650_init(struct tm16xx_display *display) {
u8 cmds[2];
static const u8 ON_FLAG = 1, BR_MASK = 7, BR_SHIFT = 4, SEG8_MODE = 0 << 3;
/* SEG7_MODE = 1 << 3
* tm1650 and fd650 have only 4 digits and they
* use an 8th segment for the time separator
* */
const enum led_brightness brightness = display->main_led.brightness;
cmds[0] = 0x48;
cmds[1] = (brightness && 1) * ((brightness & BR_MASK) << BR_SHIFT | SEG8_MODE | ON_FLAG);
return tm16xx_i2c_write(display, cmds, ARRAY_SIZE(cmds));
}
static int tm1650_data(struct tm16xx_display *display, u8 index, u8 data) {
static const u8 BASE_ADDR = 0x68;
u8 cmds[2];
cmds[0] = BASE_ADDR + index * 2;
cmds[1] = data; // SEG 1 to 8
return tm16xx_i2c_write(display, cmds, ARRAY_SIZE(cmds));
}
static int fd655_init(struct tm16xx_display *display) {
u8 cmds[2];
static const u8 ON_FLAG = 1, BR_MASK = 3, BR_SHIFT = 5;
const enum led_brightness brightness = display->main_led.brightness;
cmds[0] = 0x48;
cmds[1] = (brightness && 1) * (((brightness % 3) & BR_MASK) << BR_SHIFT | ON_FLAG);
return tm16xx_i2c_write(display, cmds, ARRAY_SIZE(cmds));
}
static int fd655_data(struct tm16xx_display *display, u8 index, u8 data) {
static const u8 BASE_ADDR = 0x66;
u8 cmds[2];
cmds[0] = BASE_ADDR + index * 2;
cmds[1] = data; // SEG 1 to 8
return tm16xx_i2c_write(display, cmds, ARRAY_SIZE(cmds));
}
static int fd6551_init(struct tm16xx_display *display) {
u8 cmds[2];
static const u8 ON_FLAG = 1, BR_MASK = 7, BR_SHIFT = 1;
const enum led_brightness brightness = display->main_led.brightness;
cmds[0] = 0x48;
cmds[1] = (brightness && 1) * ((~(brightness - 1) & BR_MASK) << BR_SHIFT | ON_FLAG);
return tm16xx_i2c_write(display, cmds, ARRAY_SIZE(cmds));
}
void hbs658_msb_to_lsb(u8 *array, size_t length) {
for (size_t i = 0; i < length; i++) {
array[i] = (array[i] << 4) | (array[i] >> 4);
}
}
static int hbs658_init(struct tm16xx_display *display) {
u8 cmd;
static const u8 DATA_CMD = 0 << 7 | 1 << 6, DATA_ADDR_MODE = 0 << 2, DATA_WRITE_MODE = 0 << 1 | 0 << 0;
static const u8 CTRL_CMD = 1 << 7 | 0 << 6, ON_FLAG = 1 << 3, BR_MASK = 7, BR_SHIFT = 0;
const enum led_brightness brightness = display->main_led.brightness;
int ret;
cmd = DATA_CMD | DATA_ADDR_MODE | DATA_WRITE_MODE;
hbs658_msb_to_lsb(&cmd, 1);
ret = tm16xx_spi_write(display, &cmd, 1);
if (ret < 0)
return ret;
cmd = CTRL_CMD | ((brightness && 1) * (((brightness - 1) & BR_MASK) << BR_SHIFT | ON_FLAG));
hbs658_msb_to_lsb(&cmd, 1);
ret = tm16xx_spi_write(display, &cmd, 1);
if (ret < 0)
return ret;
return 0;
}
static int hbs658_data(struct tm16xx_display *display, u8 index, u8 data) {
static const u8 ADDR_CMD = 1 << 7 | 1 << 6;
u8 cmds[2];
cmds[0] = ADDR_CMD + index * 2;
cmds[1] = data;
hbs658_msb_to_lsb(cmds, ARRAY_SIZE(cmds));
return tm16xx_spi_write(display, cmds, ARRAY_SIZE(cmds));
}
static const struct tm16xx_controller tm1618_controller = {
.max_brightness = 8,
.init = tm1628_init,
.data = tm1618_data,
};
static const struct tm16xx_controller tm1628_controller = {
.max_brightness = 8,
.init = tm1628_init,
.data = tm1628_data,
};
static const struct tm16xx_controller tm1650_controller = {
.max_brightness = 8,
.init = tm1650_init,
.data = tm1650_data,
};
static const struct tm16xx_controller fd655_controller = {
.max_brightness = 3,
.init = fd655_init,
.data = fd655_data,
};
static const struct tm16xx_controller fd6551_controller = {
.max_brightness = 8,
.init = fd6551_init,
.data = fd655_data,
};
static const struct tm16xx_controller hbs658_controller = {
.max_brightness = 8,
.init = hbs658_init,
.data = hbs658_data,
};
static int parse_int_array(const char *buf, int **array)
{
int *values, value, count = 0, len;
const char *ptr = buf;
while (1 == sscanf(ptr, "%d %n", &value, &len)) {
count++;
ptr += len;
}
if (count == 0) {
*array = NULL;
return 0;
}
values = kmalloc(count * sizeof(*values), GFP_KERNEL);
if (!values)
return -ENOMEM;
ptr = buf;
count = 0;
while (1 == sscanf(ptr, "%d %n", &value, &len)) {
values[count++] = value;
ptr += len;
}
*array = values;
return count;
}
static SEG7_CONVERSION_MAP(map_seg7, MAP_ASCII7SEG_ALPHANUM);
/**
* tm16xx_ascii_to_segments - Convert ASCII character to segment pattern
* @display: Pointer to tm16xx_display structure
* @c: ASCII character to convert
*
* Return: Segment pattern for the given ASCII character
*/
static u8 tm16xx_ascii_to_segments(struct tm16xx_display *display, char c)
{
u8 standard_segments, mapped_segments = 0;
int i;
standard_segments = map_to_seg7(&map_seg7, c);
for (i = 0; i < DIGIT_SEGMENTS; i++) {
if (standard_segments & BIT(i))
mapped_segments |= BIT(display->segment_mapping[i]);
}
return mapped_segments;
}
/**
* tm16xx_display_flush_init - Work function to update controller configuration (mode and brightness)
* @work: Pointer to work_struct
*/
static void tm16xx_display_flush_init(struct work_struct *work)
{
struct tm16xx_display *display = container_of(work, struct tm16xx_display, flush_init);
int ret;
if (display->controller->init) {
mutex_lock(&display->lock);
ret = display->controller->init(display);
display->flush_status = ret;
mutex_unlock(&display->lock);
if (ret < 0)
dev_err(display->dev, "Failed to set brightness: %d\n", ret);
}
}
/**
* tm16xx_display_flush_data - Work function to update display data
* @work: Pointer to work_struct
*/
static void tm16xx_display_flush_data(struct work_struct *work)
{
struct tm16xx_display *display = container_of(work, struct tm16xx_display, flush_display);
int i, ret = 0;
mutex_lock(&display->lock);
if (display->controller->data) {
for (i = 0; i < display->display_data_len; i++) {
ret = display->controller->data(display, i, display->display_data[i]);
if (ret < 0) {
dev_err(display->dev, "Failed to write display data: %d\n", ret);
break;
}
}
}
display->flush_status = ret;
mutex_unlock(&display->lock);
}
/**
* tm16xx_display_flush_data_transposed - Transposed flush work function
* @work: Pointer to work_struct
*/
static void tm16xx_display_flush_data_transposed(struct work_struct *work)
{
struct tm16xx_display *display = container_of(work, struct tm16xx_display, flush_display);
int i, j, ret = 0;
u8 transposed_data;
mutex_lock(&display->lock);
if (display->controller->data) {
/* Write operations based on number of segments */
for (i = MIN_SEGMENT; i <= MAX_SEGMENT; i++) {
/* Gather bits from each grid for this segment */
transposed_data = 0;
for (j = 0; j < display->display_data_len; j++) {
if (display->display_data[j] & BIT(i))
transposed_data |= BIT(MAX_SEGMENT - j);
}
ret = display->controller->data(display, i, transposed_data);
if (ret < 0) {
dev_err(display->dev, "Failed to write transposed data: %d\n", ret);
break;
}
}
}
display->flush_status = ret;
mutex_unlock(&display->lock);
}
/**
* tm16xx_display_init - Initialize the display
* @display: Pointer to tm16xx_display structure
*
* Return: 0 on success, negative error code on failure
*/
static int tm16xx_display_init(struct tm16xx_display *display)
{
schedule_work(&display->flush_init);
flush_work(&display->flush_init);
if (display->flush_status < 0)
return display->flush_status;
memset(display->display_data, 0xFF, display->display_data_len);
schedule_work(&display->flush_display);
flush_work(&display->flush_display);
memset(display->display_data, 0x00, display->display_data_len);
if (display->flush_status < 0)
return display->flush_status;
return 0;
}
/**
* tm16xx_display_remove - Remove the display
* @display: Pointer to tm16xx_display structure
*/
static void tm16xx_display_remove(struct tm16xx_display *display)
{
memset(display->display_data, 0x00, display->display_data_len);
schedule_work(&display->flush_display);
flush_work(&display->flush_display);
display->main_led.brightness = LED_OFF;
schedule_work(&display->flush_init);
flush_work(&display->flush_init);
dev_info(display->dev, "Display turned off\n");
}
/**
* tm16xx_brightness_set - Set brightness of the display
* @led_cdev: Pointer to led_classdev
* @brightness: Brightness value to set
*/
static void tm16xx_brightness_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
struct tm16xx_display *display = dev_get_drvdata(led_cdev->dev->parent);
led_cdev->brightness = brightness;
schedule_work(&display->flush_init);
}
/**
* tm16xx_led_set - Set state of an individual LED
* @led_cdev: Pointer to led_classdev
* @value: Value to set (on/off)
*/
static void tm16xx_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct tm16xx_led *led = container_of(led_cdev, struct tm16xx_led, cdev);
struct tm16xx_display *display = dev_get_drvdata(led_cdev->dev->parent);
if (value)
display->display_data[led->grid] |= (1 << led->segment);
else
display->display_data[led->grid] &= ~(1 << led->segment);
schedule_work(&display->flush_display);
}
/**
* tm16xx_display_value_show - Show current display value
* @dev: Pointer to device structure
* @attr: Pointer to device attribute structure
* @buf: Buffer to write the display value
*
* Return: Number of bytes written to buffer
*/
static ssize_t tm16xx_display_value_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct tm16xx_display *display = dev_get_drvdata(led_cdev->dev->parent);
int i;
for (i = 0; i < display->num_digits && i < PAGE_SIZE - 1; i++) {
buf[i] = display->digits[i].value;
}
buf[i++] = '\n';
return i;
}
/**
* tm16xx_display_value_store - Store new display value
* @dev: Pointer to device structure
* @attr: Pointer to device attribute structure
* @buf: Buffer containing the new display value
* @count: Number of bytes in buffer
*
* Return: Number of bytes written or negative error code
*/
static ssize_t tm16xx_display_value_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct tm16xx_display *display = dev_get_drvdata(led_cdev->dev->parent);
struct tm16xx_digit *digit;
int i;
u8 data;
for (i = 0; i < display->num_digits; i++) {
digit = &display->digits[i];
if (i < count && buf[i] != '\n') {
digit->value = buf[i];
data = tm16xx_ascii_to_segments(display, digit->value);
} else {
digit->value = 0;
data = 0;
}
display->display_data[digit->grid] =
(display->display_data[digit->grid] & ~display->digit_bitmask) |
(data & display->digit_bitmask);
}
schedule_work(&display->flush_display);
return count;
}
/**
* tm16xx_num_digits_show - Show the number of digits in the display
* @dev: The device struct
* @attr: The device_attribute struct
* @buf: The output buffer
*
* This function returns the number of digits in the display.
*
* Return: Number of bytes written to buf
*/
static ssize_t tm16xx_num_digits_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct tm16xx_display *display = dev_get_drvdata(led_cdev->dev->parent);
return sprintf(buf, "%d\n", display->num_digits);
}
/**
* tm16xx_segment_mapping_show - Show the current segment mapping
* @dev: The device struct
* @attr: The device_attribute struct
* @buf: The output buffer
*
* This function returns the current segment mapping of the display.
*
* Return: Number of bytes written to buf
*/
static ssize_t tm16xx_segment_mapping_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct tm16xx_display *display = dev_get_drvdata(led_cdev->dev->parent);
int i, count = 0;
for (i = 0; i < DIGIT_SEGMENTS; i++) {
count += sprintf(buf + count, "%d ", display->segment_mapping[i]);
}
count += sprintf(buf + count, "\n");
return count;
}
/**
* tm16xx_segment_mapping_store - Set a new segment mapping
* @dev: The device struct
* @attr: The device_attribute struct
* @buf: The input buffer
* @count: Number of bytes in buf
*
* This function sets a new segment mapping for the display.
* It validates that each value is within the valid range, and that
* the number of received values matches the number of segments.
*
* Return: count on success, negative errno on failure
*/
static ssize_t tm16xx_segment_mapping_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct tm16xx_display *display = dev_get_drvdata(led_cdev->dev->parent);
int *array, ret, i;
ret = parse_int_array(buf, &array);
if (ret < 0)
return ret;
if (ret != DIGIT_SEGMENTS) {
kfree(array);
return -EINVAL;
}
for (i = 0; i < DIGIT_SEGMENTS; i++) {
if (array[i] < MIN_SEGMENT ||
array[i] > MAX_SEGMENT) {
kfree(array);
return -EINVAL;
}
}
display->digit_bitmask = 0;
for (i = 0; i < DIGIT_SEGMENTS; i++) {
display->segment_mapping[i] = (u8) array[i];
display->digit_bitmask |= BIT(display->segment_mapping[i]);
}
kfree(array);
return count;
}
/**
* tm16xx_digits_ordering_show - Show the current digit ordering
* @dev: The device struct
* @attr: The device_attribute struct
* @buf: The output buffer
*
* This function returns the current ordering of digits in the display.
*
* Return: Number of bytes written to buf
*/
static ssize_t tm16xx_digits_ordering_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct tm16xx_display *display = dev_get_drvdata(led_cdev->dev->parent);
int i, count = 0;
for (i = 0; i < display->num_digits; i++) {
count += sprintf(buf + count, "%d ", display->digits[i].grid);
}
count += sprintf(buf + count, "\n");
return count;
}
/**
* tm16xx_digits_ordering_store - Set a new digit ordering
* @dev: The device struct
* @attr: The device_attribute struct
* @buf: The input buffer
* @count: Number of bytes in buf
*
* This function sets a new ordering of digits for the display.
* It validates that all values match the original digit grid indexes,
* and that the number of received values matches the number of digits.
*
* Return: count on success, negative errno on failure
*/
static ssize_t tm16xx_digits_ordering_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct tm16xx_display *display = dev_get_drvdata(led_cdev->dev->parent);
int *array, ret, i, j;
bool found;
ret = parse_int_array(buf, &array);
if (ret < 0)
return ret;
if (ret != display->num_digits) {
kfree(array);
return -EINVAL;
}
for (i = 0; i < display->num_digits; i++) {
found = false;
for (j = 0; j < display->num_digits; j++) {
if (display->digits[i].grid == array[j]) {
found = true;
break;
}
}
if (!found) {
kfree(array);
return -EINVAL;
}
}
for (i = 0; i < display->num_digits; i++) {
display->digits[i].grid = (u8) array[i];
}
kfree(array);
return count;
}
/**
* tm16xx_map_seg7_show - Show the current 7-segment character map
* @dev: The device struct
* @attr: The device_attribute struct
* @buf: The output buffer
*
* This function returns the current 7-segment character map.
*
* Return: Number of bytes written to buf
*/
static ssize_t tm16xx_map_seg7_show(struct device *dev, struct device_attribute *attr, char *buf)
{
memcpy(buf, &map_seg7, sizeof(map_seg7));
return sizeof(map_seg7);
}
/**
* tm16xx_map_seg7_store - Set a new 7-segment character map
* @dev: The device struct
* @attr: The device_attribute struct
* @buf: The input buffer
* @cnt: Number of bytes in buf
*
* This function sets a new 7-segment character map.
*
* Return: cnt on success, negative errno on failure
*/
static ssize_t tm16xx_map_seg7_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t cnt)
{
if(cnt != sizeof(map_seg7))
return -EINVAL;
memcpy(&map_seg7, buf, cnt);
return cnt;
}
static DEVICE_ATTR(value, 0644, tm16xx_display_value_show, tm16xx_display_value_store);
static DEVICE_ATTR(num_digits, 0444, tm16xx_num_digits_show, NULL);
static DEVICE_ATTR(segments, 0644, tm16xx_segment_mapping_show, tm16xx_segment_mapping_store);
static DEVICE_ATTR(digits, 0644, tm16xx_digits_ordering_show, tm16xx_digits_ordering_store);
static DEVICE_ATTR(map_seg7, 0644, tm16xx_map_seg7_show, tm16xx_map_seg7_store);
static struct attribute *tm16xx_main_led_attrs[] = {
&dev_attr_value.attr,
&dev_attr_num_digits.attr,
&dev_attr_segments.attr,
&dev_attr_digits.attr,
&dev_attr_map_seg7.attr,
NULL,
};
ATTRIBUTE_GROUPS(tm16xx_main_led);
/**
* tm16xx_parse_dt - Parse device tree data
* @dev: Pointer to device structure
* @display: Pointer to tm16xx_display structure
*
* Return: 0 on success, negative error code on failure
*/
static int tm16xx_parse_dt(struct device *dev, struct tm16xx_display *display)
{
struct fwnode_handle *child;
int ret, i, max_grid = 0;
u8 *digits;
display->transpose_display_data = device_property_read_bool(dev, "tm16xx,transposed");
ret = device_property_count_u8(dev, "tm16xx,digits");
if (ret < 0) {
dev_err(dev, "Failed to count 'tm16xx,digits' property: %d\n", ret);
return ret;
}
display->num_digits = ret;
dev_dbg(dev, "Number of digits: %d\n", display->num_digits);
digits = devm_kcalloc(dev, display->num_digits, sizeof(*digits), GFP_KERNEL);
if (!digits)
return -ENOMEM;
ret = device_property_read_u8_array(dev, "tm16xx,digits", digits, display->num_digits);
if (ret < 0) {
dev_err(dev, "Failed to read 'tm16xx,digits' property: %d\n", ret);
return ret;
}
display->digits = devm_kcalloc(dev, display->num_digits, sizeof(*display->digits), GFP_KERNEL);
if (!display->digits)
return -ENOMEM;
for (i = 0; i < display->num_digits; i++) {
display->digits[i].grid = digits[i];
max_grid = umax(max_grid, digits[i]);
}
devm_kfree(dev, digits);
ret = device_property_read_u8_array(dev, "tm16xx,segment-mapping", display->segment_mapping, DIGIT_SEGMENTS);
if (ret < 0) {
dev_err(dev, "Failed to read 'tm16xx,segment-mapping' property: %d\n", ret);
return ret;
}
display->digit_bitmask = 0;
for (i = 0; i < DIGIT_SEGMENTS; i++) {
if (display->segment_mapping[i] < MIN_SEGMENT ||
display->segment_mapping[i] > MAX_SEGMENT) {
dev_err(dev, "Invalid 'tm16xx,segment-mapping' value: %d (must be between %d and %d)\n", display->segment_mapping[i], MIN_SEGMENT, MAX_SEGMENT);
return -EINVAL;
}
display->digit_bitmask |= BIT(display->segment_mapping[i]);
}
display->num_leds = 0;
device_for_each_child_node(dev, child) {
u32 reg[2];
ret = fwnode_property_read_u32_array(child, "reg", reg, 2);
if (ret < 0) {
dev_err(dev, "Failed to read 'reg' property of led node: %d\n", ret);
return ret;
}
max_grid = umax(max_grid, reg[0]);
display->num_leds++;
}
dev_dbg(dev, "Number of LEDs: %d\n", display->num_leds);
display->display_data_len = max_grid + 1;
dev_dbg(dev, "Number of display grids: %zu\n", display->display_data_len);
display->display_data = devm_kcalloc(dev, display->display_data_len, sizeof(*display->display_data), GFP_KERNEL);
if (!display->display_data)
return -ENOMEM;
return 0;
}
/**
* tm16xx_probe - Probe function for tm16xx devices
* @display: Pointer to tm16xx_display structure
*
* Return: 0 on success, negative error code on failure
*/
static int tm16xx_probe(struct tm16xx_display *display)
{
struct device *dev = display->dev;
struct fwnode_handle *child;
int ret, i;
ret = tm16xx_parse_dt(dev, display);
if (ret < 0) {
dev_err(dev, "Failed to parse device tree: %d\n", ret);
return ret;
}
mutex_init(&display->lock);
INIT_WORK(&display->flush_init, tm16xx_display_flush_init);
/* Initialize work structure with appropriate flush function */
if (display->transpose_display_data) {
INIT_WORK(&display->flush_display, tm16xx_display_flush_data_transposed);
dev_info(display->dev, "Operating in transposed mode\n");
} else {
INIT_WORK(&display->flush_display, tm16xx_display_flush_data);
}
display->main_led.name = TM16XX_DEVICE_NAME;
display->main_led.brightness = display->controller->max_brightness;
display->main_led.max_brightness = display->controller->max_brightness;
display->main_led.brightness_set = tm16xx_brightness_set;
display->main_led.groups = tm16xx_main_led_groups;
display->main_led.flags = LED_RETAIN_AT_SHUTDOWN | LED_CORE_SUSPENDRESUME;
ret = devm_led_classdev_register(dev, &display->main_led);
if (ret < 0) {
dev_err(dev, "Failed to register main LED: %d\n", ret);
return ret;
}
display->leds = devm_kcalloc(dev, display->num_leds, sizeof(*display->leds), GFP_KERNEL);
if (!display->leds)
return -ENOMEM;
i = 0;
device_for_each_child_node(dev, child) {
struct tm16xx_led *led = &display->leds[i];
struct led_init_data led_init = {
.fwnode = child,
.devicename = display->main_led.name,
.devname_mandatory = true,
};
u32 reg[2];
ret = fwnode_property_read_u32_array(child, "reg", reg, 2);
if (ret < 0) {
dev_err(dev, "Failed to read LED reg property: %d\n", ret);
return ret;
}
led->grid = reg[0];
led->segment = reg[1];
led->cdev.max_brightness = 1;
led->cdev.brightness_set = tm16xx_led_set;
led->cdev.flags = LED_RETAIN_AT_SHUTDOWN | LED_CORE_SUSPENDRESUME;
ret = devm_led_classdev_register_ext(dev, &led->cdev, &led_init);
if (ret < 0) {
dev_err(dev, "Failed to register LED %s: %d\n", led->cdev.name, ret);
return ret;
}