diff options
Diffstat (limited to 'drivers/auxdisplay/max6959.c')
| -rw-r--r-- | drivers/auxdisplay/max6959.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/drivers/auxdisplay/max6959.c b/drivers/auxdisplay/max6959.c new file mode 100644 index 0000000000..5519c014bd --- /dev/null +++ b/drivers/auxdisplay/max6959.c @@ -0,0 +1,194 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * MAX6958/6959 7-segment LED display controller + * Datasheet: + * https://www.analog.com/media/en/technical-documentation/data-sheets/MAX6958-MAX6959.pdf + * + * Copyright (c) 2024, Intel Corporation. + * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com> + */ +#include <linux/array_size.h> +#include <linux/bitrev.h> +#include <linux/bits.h> +#include <linux/container_of.h> +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/pm.h> +#include <linux/regmap.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/workqueue.h> + +#include <linux/map_to_7segment.h> + +#include "line-display.h" + +/* Registers */ +#define REG_DECODE_MODE 0x01 +#define REG_INTENSITY 0x02 +#define REG_SCAN_LIMIT 0x03 +#define REG_CONFIGURATION 0x04 +#define REG_CONFIGURATION_S_BIT BIT(0) + +#define REG_DIGIT(x) (0x20 + (x)) +#define REG_DIGIT0 0x20 +#define REG_DIGIT1 0x21 +#define REG_DIGIT2 0x22 +#define REG_DIGIT3 0x23 + +#define REG_SEGMENTS 0x24 +#define REG_MAX REG_SEGMENTS + +struct max6959_priv { + struct linedisp linedisp; + struct delayed_work work; + struct regmap *regmap; +}; + +static void max6959_disp_update(struct work_struct *work) +{ + struct max6959_priv *priv = container_of(work, struct max6959_priv, work.work); + struct linedisp *linedisp = &priv->linedisp; + struct linedisp_map *map = linedisp->map; + char *s = linedisp->buf; + u8 buf[4]; + + /* Map segments according to datasheet */ + buf[0] = bitrev8(map_to_seg7(&map->map.seg7, *s++)) >> 1; + buf[1] = bitrev8(map_to_seg7(&map->map.seg7, *s++)) >> 1; + buf[2] = bitrev8(map_to_seg7(&map->map.seg7, *s++)) >> 1; + buf[3] = bitrev8(map_to_seg7(&map->map.seg7, *s++)) >> 1; + + regmap_bulk_write(priv->regmap, REG_DIGIT(0), buf, ARRAY_SIZE(buf)); +} + +static int max6959_linedisp_get_map_type(struct linedisp *linedisp) +{ + struct max6959_priv *priv = container_of(linedisp, struct max6959_priv, linedisp); + + INIT_DELAYED_WORK(&priv->work, max6959_disp_update); + return LINEDISP_MAP_SEG7; +} + +static void max6959_linedisp_update(struct linedisp *linedisp) +{ + struct max6959_priv *priv = container_of(linedisp, struct max6959_priv, linedisp); + + schedule_delayed_work(&priv->work, 0); +} + +static const struct linedisp_ops max6959_linedisp_ops = { + .get_map_type = max6959_linedisp_get_map_type, + .update = max6959_linedisp_update, +}; + +static int max6959_enable(struct max6959_priv *priv, bool enable) +{ + u8 mask = REG_CONFIGURATION_S_BIT; + u8 value = enable ? mask : 0; + + return regmap_update_bits(priv->regmap, REG_CONFIGURATION, mask, value); +} + +static void max6959_power_off(void *priv) +{ + max6959_enable(priv, false); +} + +static int max6959_power_on(struct max6959_priv *priv) +{ + struct device *dev = regmap_get_device(priv->regmap); + int ret; + + ret = max6959_enable(priv, true); + if (ret) + return ret; + + return devm_add_action_or_reset(dev, max6959_power_off, priv); +} + +static const struct regmap_config max6959_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + + .max_register = REG_MAX, + .cache_type = REGCACHE_MAPLE, +}; + +static int max6959_i2c_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct max6959_priv *priv; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->regmap = devm_regmap_init_i2c(client, &max6959_regmap_config); + if (IS_ERR(priv->regmap)) + return PTR_ERR(priv->regmap); + + ret = max6959_power_on(priv); + if (ret) + return ret; + + ret = linedisp_register(&priv->linedisp, dev, 4, &max6959_linedisp_ops); + if (ret) + return ret; + + i2c_set_clientdata(client, priv); + + return 0; +} + +static void max6959_i2c_remove(struct i2c_client *client) +{ + struct max6959_priv *priv = i2c_get_clientdata(client); + + cancel_delayed_work_sync(&priv->work); + linedisp_unregister(&priv->linedisp); +} + +static int max6959_suspend(struct device *dev) +{ + return max6959_enable(dev_get_drvdata(dev), false); +} + +static int max6959_resume(struct device *dev) +{ + return max6959_enable(dev_get_drvdata(dev), true); +} + +static DEFINE_SIMPLE_DEV_PM_OPS(max6959_pm_ops, max6959_suspend, max6959_resume); + +static const struct i2c_device_id max6959_i2c_id[] = { + { "max6959" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, max6959_i2c_id); + +static const struct of_device_id max6959_of_table[] = { + { .compatible = "maxim,max6959" }, + { } +}; +MODULE_DEVICE_TABLE(of, max6959_of_table); + +static struct i2c_driver max6959_i2c_driver = { + .driver = { + .name = "max6959", + .pm = pm_sleep_ptr(&max6959_pm_ops), + .of_match_table = max6959_of_table, + }, + .probe = max6959_i2c_probe, + .remove = max6959_i2c_remove, + .id_table = max6959_i2c_id, +}; +module_i2c_driver(max6959_i2c_driver); + +MODULE_DESCRIPTION("MAX6958/6959 7-segment LED controller"); +MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(LINEDISP); |