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path: root/drivers/media/rc/ir-spi.c
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Diffstat (limited to 'drivers/media/rc/ir-spi.c')
-rw-r--r--drivers/media/rc/ir-spi.c137
1 files changed, 65 insertions, 72 deletions
diff --git a/drivers/media/rc/ir-spi.c b/drivers/media/rc/ir-spi.c
index 7e383b3fedd5..392441e0c116 100644
--- a/drivers/media/rc/ir-spi.c
+++ b/drivers/media/rc/ir-spi.c
@@ -1,43 +1,32 @@
-/*
- * Copyright (c) 2016 Samsung Electronics Co., Ltd.
- * Author: Andi Shyti <andi.shyti@samsung.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * SPI driven IR LED device driver
- */
-
-#include <linux/delay.h>
-#include <linux/fs.h>
+// SPDX-License-Identifier: GPL-2.0
+// SPI driven IR LED device driver
+//
+// Copyright (c) 2016 Samsung Electronics Co., Ltd.
+// Copyright (c) Andi Shyti <andi@etezian.org>
+
+#include <linux/bits.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/math.h>
+#include <linux/mod_devicetable.h>
#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/of_gpio.h>
+#include <linux/property.h>
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
#include <media/rc-core.h>
#define IR_SPI_DRIVER_NAME "ir-spi"
-/* pulse value for different duty cycles */
-#define IR_SPI_PULSE_DC_50 0xff00
-#define IR_SPI_PULSE_DC_60 0xfc00
-#define IR_SPI_PULSE_DC_70 0xf800
-#define IR_SPI_PULSE_DC_75 0xf000
-#define IR_SPI_PULSE_DC_80 0xc000
-#define IR_SPI_PULSE_DC_90 0x8000
-
#define IR_SPI_DEFAULT_FREQUENCY 38000
-#define IR_SPI_BIT_PER_WORD 8
-#define IR_SPI_MAX_BUFSIZE 4096
+#define IR_SPI_BITS_PER_PULSE 16
struct ir_spi_data {
u32 freq;
- u8 duty_cycle;
bool negated;
- u16 tx_buf[IR_SPI_MAX_BUFSIZE];
u16 pulse;
u16 space;
@@ -46,45 +35,50 @@ struct ir_spi_data {
struct regulator *regulator;
};
-static int ir_spi_tx(struct rc_dev *dev,
- unsigned int *buffer, unsigned int count)
+static int ir_spi_tx(struct rc_dev *dev, unsigned int *buffer, unsigned int count)
{
int i;
int ret;
unsigned int len = 0;
struct ir_spi_data *idata = dev->priv;
struct spi_transfer xfer;
+ u16 *tx_buf;
/* convert the pulse/space signal to raw binary signal */
for (i = 0; i < count; i++) {
- unsigned int periods;
- int j;
- u16 val;
+ buffer[i] = DIV_ROUND_CLOSEST_ULL((u64)buffer[i] * idata->freq,
+ 1000000);
+ len += buffer[i];
+ }
- periods = DIV_ROUND_CLOSEST(buffer[i] * idata->freq, 1000000);
+ tx_buf = kmalloc_array(len, sizeof(*tx_buf), GFP_KERNEL);
+ if (!tx_buf)
+ return -ENOMEM;
- if (len + periods >= IR_SPI_MAX_BUFSIZE)
- return -EINVAL;
+ len = 0;
+ for (i = 0; i < count; i++) {
+ int j;
+ u16 val;
/*
- * the first value in buffer is a pulse, so that 0, 2, 4, ...
+ * The first value in buffer is a pulse, so that 0, 2, 4, ...
* contain a pulse duration. On the contrary, 1, 3, 5, ...
* contain a space duration.
*/
val = (i % 2) ? idata->space : idata->pulse;
- for (j = 0; j < periods; j++)
- idata->tx_buf[len++] = val;
+ for (j = 0; j < buffer[i]; j++)
+ tx_buf[len++] = val;
}
memset(&xfer, 0, sizeof(xfer));
- xfer.speed_hz = idata->freq * 16;
- xfer.len = len * sizeof(*idata->tx_buf);
- xfer.tx_buf = idata->tx_buf;
+ xfer.speed_hz = idata->freq * IR_SPI_BITS_PER_PULSE;
+ xfer.len = len * sizeof(*tx_buf);
+ xfer.tx_buf = tx_buf;
ret = regulator_enable(idata->regulator);
if (ret)
- return ret;
+ goto err_free_tx_buf;
ret = spi_sync_transfer(idata->spi, &xfer, 1);
if (ret)
@@ -92,6 +86,10 @@ static int ir_spi_tx(struct rc_dev *dev,
regulator_disable(idata->regulator);
+err_free_tx_buf:
+
+ kfree(tx_buf);
+
return ret ? ret : count;
}
@@ -102,6 +100,9 @@ static int ir_spi_set_tx_carrier(struct rc_dev *dev, u32 carrier)
if (!carrier)
return -EINVAL;
+ if (carrier > idata->spi->max_speed_hz / IR_SPI_BITS_PER_PULSE)
+ return -EINVAL;
+
idata->freq = carrier;
return 0;
@@ -110,19 +111,9 @@ static int ir_spi_set_tx_carrier(struct rc_dev *dev, u32 carrier)
static int ir_spi_set_duty_cycle(struct rc_dev *dev, u32 duty_cycle)
{
struct ir_spi_data *idata = dev->priv;
+ int bits = (duty_cycle * 15) / 100;
- if (duty_cycle >= 90)
- idata->pulse = IR_SPI_PULSE_DC_90;
- else if (duty_cycle >= 80)
- idata->pulse = IR_SPI_PULSE_DC_80;
- else if (duty_cycle >= 75)
- idata->pulse = IR_SPI_PULSE_DC_75;
- else if (duty_cycle >= 70)
- idata->pulse = IR_SPI_PULSE_DC_70;
- else if (duty_cycle >= 60)
- idata->pulse = IR_SPI_PULSE_DC_60;
- else
- idata->pulse = IR_SPI_PULSE_DC_50;
+ idata->pulse = GENMASK(bits, 0);
if (idata->negated) {
idata->pulse = ~idata->pulse;
@@ -136,15 +127,16 @@ static int ir_spi_set_duty_cycle(struct rc_dev *dev, u32 duty_cycle)
static int ir_spi_probe(struct spi_device *spi)
{
+ struct device *dev = &spi->dev;
int ret;
u8 dc;
struct ir_spi_data *idata;
- idata = devm_kzalloc(&spi->dev, sizeof(*idata), GFP_KERNEL);
+ idata = devm_kzalloc(dev, sizeof(*idata), GFP_KERNEL);
if (!idata)
return -ENOMEM;
- idata->regulator = devm_regulator_get(&spi->dev, "irda_regulator");
+ idata->regulator = devm_regulator_get(dev, "irda_regulator");
if (IS_ERR(idata->regulator))
return PTR_ERR(idata->regulator);
@@ -155,48 +147,49 @@ static int ir_spi_probe(struct spi_device *spi)
idata->rc->tx_ir = ir_spi_tx;
idata->rc->s_tx_carrier = ir_spi_set_tx_carrier;
idata->rc->s_tx_duty_cycle = ir_spi_set_duty_cycle;
+ idata->rc->device_name = "IR SPI";
idata->rc->driver_name = IR_SPI_DRIVER_NAME;
idata->rc->priv = idata;
idata->spi = spi;
- idata->negated = of_property_read_bool(spi->dev.of_node,
- "led-active-low");
- ret = of_property_read_u8(spi->dev.of_node, "duty-cycle", &dc);
+ idata->negated = device_property_read_bool(dev, "led-active-low");
+ ret = device_property_read_u8(dev, "duty-cycle", &dc);
if (ret)
dc = 50;
- /* ir_spi_set_duty_cycle cannot fail,
- * it returns int to be compatible with the
- * rc->s_tx_duty_cycle function
+ /*
+ * ir_spi_set_duty_cycle() cannot fail, it returns int
+ * to be compatible with the rc->s_tx_duty_cycle function.
*/
ir_spi_set_duty_cycle(idata->rc, dc);
idata->freq = IR_SPI_DEFAULT_FREQUENCY;
- return devm_rc_register_device(&spi->dev, idata->rc);
-}
-
-static int ir_spi_remove(struct spi_device *spi)
-{
- return 0;
+ return devm_rc_register_device(dev, idata->rc);
}
static const struct of_device_id ir_spi_of_match[] = {
{ .compatible = "ir-spi-led" },
- {},
+ {}
};
+MODULE_DEVICE_TABLE(of, ir_spi_of_match);
+
+static const struct spi_device_id ir_spi_ids[] = {
+ { "ir-spi-led" },
+ {}
+};
+MODULE_DEVICE_TABLE(spi, ir_spi_ids);
static struct spi_driver ir_spi_driver = {
.probe = ir_spi_probe,
- .remove = ir_spi_remove,
+ .id_table = ir_spi_ids,
.driver = {
.name = IR_SPI_DRIVER_NAME,
.of_match_table = ir_spi_of_match,
},
};
-
module_spi_driver(ir_spi_driver);
-MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>");
+MODULE_AUTHOR("Andi Shyti <andi@etezian.org>");
MODULE_DESCRIPTION("SPI IR LED");
MODULE_LICENSE("GPL v2");
generated by cgit (git 2.34.1) at 2025-12-25 02:41:02 +0000