* [PATCH v3 2/2] media: rc: introduce Meson IR blaster driver
@ 2021-07-09 16:57 ` Viktor Prutyanov
0 siblings, 0 replies; 17+ messages in thread
From: Viktor Prutyanov @ 2021-07-09 16:57 UTC (permalink / raw)
To: sean, mchehab, robh+dt, khilman, narmstrong
Cc: jbrunet, martin.blumenstingl, linux-media, devicetree,
linux-kernel, linux-arm-kernel, linux-amlogic, rockosov,
Viktor Prutyanov
This patch adds the driver for Amlogic Meson IR blaster.
Some Amlogic SoCs such as A311D and T950D4 have IR transmitter
(blaster) controller onboard. It is capable of sending IR
signals with arbitrary carrier frequency and duty cycle.
The driver supports 3 modulation clock sources:
- sysclk
- xtal3 clock (xtal divided by 3)
- 1us clock
Signed-off-by: Viktor Prutyanov <viktor.prutyanov@phystech.edu>
---
changes in v2:
- threaded IRQ removed, all stuff done in IRQ handler
- DIV_ROUND_CLOSEST_ULL replaced with DIV_ROUND_CLOSEST
- compatible changed to "amlogic,meson-g12a-irblaster"
- 'debug' parameter removed
- dprintk() replaced with dev_dbg()/dev_info()
- carrier frequency checked against 0
- device_name added
changes in v3:
- license header fixed
- 'max_fifo_level' parameter removed
- irq and clk_nr deleted from irblaster_dev struct
- some divisions replaced with DIV_ROUND_CLOSEST
- irb_send inlined
- fixed early completion in IRQ handler
- spin lock added before kfree
drivers/media/rc/Kconfig | 10 +
drivers/media/rc/Makefile | 1 +
drivers/media/rc/meson-irblaster.c | 400 +++++++++++++++++++++++++++++
3 files changed, 411 insertions(+)
create mode 100644 drivers/media/rc/meson-irblaster.c
diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
index d0a8326b75c2..6e60348e1bcf 100644
--- a/drivers/media/rc/Kconfig
+++ b/drivers/media/rc/Kconfig
@@ -246,6 +246,16 @@ config IR_MESON
To compile this driver as a module, choose M here: the
module will be called meson-ir.
+config IR_MESON_IRBLASTER
+ tristate "Amlogic Meson IR blaster"
+ depends on ARCH_MESON || COMPILE_TEST
+ help
+ Say Y if you want to use the IR blaster available on
+ Amlogic Meson SoCs.
+
+ To compile this driver as a module, choose M here: the
+ module will be called meson-irblaster.
+
config IR_MTK
tristate "Mediatek IR remote receiver"
depends on ARCH_MEDIATEK || COMPILE_TEST
diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile
index 692e9b6b203f..b108f2b0420c 100644
--- a/drivers/media/rc/Makefile
+++ b/drivers/media/rc/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_IR_ITE_CIR) += ite-cir.o
obj-$(CONFIG_IR_MCEUSB) += mceusb.o
obj-$(CONFIG_IR_FINTEK) += fintek-cir.o
obj-$(CONFIG_IR_MESON) += meson-ir.o
+obj-$(CONFIG_IR_MESON_IRBLASTER) += meson-irblaster.o
obj-$(CONFIG_IR_NUVOTON) += nuvoton-cir.o
obj-$(CONFIG_IR_ENE) += ene_ir.o
obj-$(CONFIG_IR_REDRAT3) += redrat3.o
diff --git a/drivers/media/rc/meson-irblaster.c b/drivers/media/rc/meson-irblaster.c
new file mode 100644
index 000000000000..758d9abf252e
--- /dev/null
+++ b/drivers/media/rc/meson-irblaster.c
@@ -0,0 +1,400 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/**
+ * meson-irblaster.c - Amlogic Meson IR blaster driver
+ *
+ * Copyright (c) 2021, SberDevices. All Rights Reserved.
+ *
+ * Author: Viktor Prutyanov <viktor.prutyanov@phystech.edu>
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/of_irq.h>
+#include <linux/clk.h>
+#include <linux/slab.h>
+#include <media/rc-core.h>
+
+#define DEVICE_NAME "Meson IR blaster"
+#define DRIVER_NAME "meson-irblaster"
+
+#define IRB_MOD_1US_CLK_RATE 1000000
+
+#define IRB_DEFAULT_CARRIER 38000
+#define IRB_DEFAULT_DUTY_CYCLE 50
+
+#define IRB_FIFO_LEN 128
+#define IRB_DEFAULT_MAX_FIFO_LEVEL 96
+
+#define IRB_ADDR0 0x0
+#define IRB_ADDR1 0x4
+#define IRB_ADDR2 0x8
+#define IRB_ADDR3 0xc
+
+#define IRB_MAX_DELAY (1 << 10)
+#define IRB_DELAY_MASK (IRB_MAX_DELAY - 1)
+
+/* IRCTRL_IR_BLASTER_ADDR0 */
+#define IRB_MOD_CLK(x) ((x) << 12)
+#define IRB_MOD_SYS_CLK 0
+#define IRB_MOD_XTAL3_CLK 1
+#define IRB_MOD_1US_CLK 2
+#define IRB_MOD_10US_CLK 3
+#define IRB_INIT_HIGH BIT(2)
+#define IRB_ENABLE BIT(0)
+
+/* IRCTRL_IR_BLASTER_ADDR2 */
+#define IRB_MOD_COUNT(lo, hi) ((((lo) - 1) << 16) | ((hi) - 1))
+
+/* IRCTRL_IR_BLASTER_ADDR2 */
+#define IRB_WRITE_FIFO BIT(16)
+#define IRB_MOD_ENABLE BIT(12)
+#define IRB_TB_1US (0x0 << 10)
+#define IRB_TB_10US (0x1 << 10)
+#define IRB_TB_100US (0x2 << 10)
+#define IRB_TB_MOD_CLK (0x3 << 10)
+
+/* IRCTRL_IR_BLASTER_ADDR3 */
+#define IRB_FIFO_THD_PENDING BIT(16)
+#define IRB_FIFO_IRQ_ENABLE BIT(8)
+
+struct irblaster_dev {
+ struct device *dev;
+ void __iomem *reg_base;
+ u32 *buf;
+ unsigned int buf_len;
+ unsigned int buf_head;
+ unsigned int carrier;
+ unsigned int duty_cycle;
+ spinlock_t lock;
+ struct completion completion;
+ unsigned int max_fifo_level;
+ unsigned long clk_rate;
+};
+
+static void irb_set_mod(struct irblaster_dev *irb)
+{
+ unsigned int cnt = DIV_ROUND_CLOSEST(irb->clk_rate, irb->carrier);
+ unsigned int pulse_cnt = DIV_ROUND_CLOSEST(cnt * irb->duty_cycle, 100);
+ unsigned int space_cnt = cnt - pulse_cnt;
+
+ dev_dbg(irb->dev, "F_mod = %uHz, T_mod = %luns, duty_cycle = %u%%\n",
+ irb->carrier, NSEC_PER_SEC / irb->clk_rate * cnt,
+ 100 * pulse_cnt / cnt);
+
+ writel(IRB_MOD_COUNT(pulse_cnt, space_cnt),
+ irb->reg_base + IRB_ADDR1);
+}
+
+static void irb_setup(struct irblaster_dev *irb, unsigned int clk_nr)
+{
+ unsigned int fifo_irq_threshold = IRB_FIFO_LEN - irb->max_fifo_level;
+
+ /*
+ * Disable the blaster, set modulator clock tick and set initialize
+ * output to be high. Set up carrier frequency and duty cycle. Then
+ * unset initialize output. Enable FIFO interrupt, set FIFO interrupt
+ * threshold. Finally, enable the blaster back.
+ */
+ writel(~IRB_ENABLE & (IRB_MOD_CLK(clk_nr) | IRB_INIT_HIGH),
+ irb->reg_base + IRB_ADDR0);
+ irb_set_mod(irb);
+ writel(readl(irb->reg_base + IRB_ADDR0) & ~IRB_INIT_HIGH,
+ irb->reg_base + IRB_ADDR0);
+ writel(IRB_FIFO_IRQ_ENABLE | fifo_irq_threshold,
+ irb->reg_base + IRB_ADDR3);
+ writel(readl(irb->reg_base + IRB_ADDR0) | IRB_ENABLE,
+ irb->reg_base + IRB_ADDR0);
+}
+
+static u32 irb_prepare_pulse(struct irblaster_dev *irb, unsigned int time)
+{
+ unsigned int delay;
+ unsigned int tb = IRB_TB_MOD_CLK;
+ unsigned int tb_us = DIV_ROUND_CLOSEST(USEC_PER_SEC, irb->carrier);
+
+ delay = (DIV_ROUND_CLOSEST(time, tb_us) - 1) & IRB_DELAY_MASK;
+
+ return ((IRB_WRITE_FIFO | IRB_MOD_ENABLE) | tb | delay);
+}
+
+static u32 irb_prepare_space(struct irblaster_dev *irb, unsigned int time)
+{
+ unsigned int delay;
+ unsigned int tb = IRB_TB_100US;
+ unsigned int tb_us = 100;
+
+ if (time <= IRB_MAX_DELAY) {
+ tb = IRB_TB_1US;
+ tb_us = 1;
+ } else if (time <= 10 * IRB_MAX_DELAY) {
+ tb = IRB_TB_10US;
+ tb_us = 10;
+ } else if (time <= 100 * IRB_MAX_DELAY) {
+ tb = IRB_TB_100US;
+ tb_us = 100;
+ }
+
+ delay = (DIV_ROUND_CLOSEST(time, tb_us) - 1) & IRB_DELAY_MASK;
+
+ return ((IRB_WRITE_FIFO & ~IRB_MOD_ENABLE) | tb | delay);
+}
+
+static void irb_send_buffer(struct irblaster_dev *irb)
+{
+ unsigned int nr = 0;
+
+ while (irb->buf_head < irb->buf_len && nr < irb->max_fifo_level) {
+ writel(irb->buf[irb->buf_head], irb->reg_base + IRB_ADDR2);
+
+ irb->buf_head++;
+ nr++;
+ }
+}
+
+static bool irb_check_buf(struct irblaster_dev *irb,
+ unsigned int *buf, unsigned int len)
+{
+ unsigned int i;
+
+ for (i = 0; i < len; i++) {
+ unsigned int max_tb_us;
+ /*
+ * Max space timebase is 100 us.
+ * Pulse timebase equals to carrier period.
+ */
+ if (i % 2 == 0)
+ max_tb_us = USEC_PER_SEC / irb->carrier;
+ else
+ max_tb_us = 100;
+
+ if (buf[i] >= max_tb_us * IRB_MAX_DELAY)
+ return false;
+ }
+
+ return true;
+}
+
+static void irb_fill_buf(struct irblaster_dev *irb, unsigned int *buf)
+{
+ unsigned int i;
+
+ for (i = 0; i < irb->buf_len; i++) {
+ if (i % 2 == 0)
+ irb->buf[i] = irb_prepare_pulse(irb, buf[i]);
+ else
+ irb->buf[i] = irb_prepare_space(irb, buf[i]);
+ }
+}
+
+static irqreturn_t irb_irqhandler(int irq, void *data)
+{
+ unsigned long flags;
+ struct irblaster_dev *irb = data;
+
+ writel(readl(irb->reg_base + IRB_ADDR3) & ~IRB_FIFO_THD_PENDING,
+ irb->reg_base + IRB_ADDR3);
+
+ spin_lock_irqsave(&irb->lock, flags);
+ if (irb->buf_head < irb->buf_len)
+ irb_send_buffer(irb);
+ else
+ complete(&irb->completion);
+ spin_unlock_irqrestore(&irb->lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+static int irb_set_tx_carrier(struct rc_dev *rc, u32 carrier)
+{
+ struct irblaster_dev *irb = rc->priv;
+
+ if (carrier == 0)
+ return -EINVAL;
+
+ irb->carrier = carrier;
+ irb_set_mod(irb);
+
+ return 0;
+}
+
+static int irb_set_tx_duty_cycle(struct rc_dev *rc, u32 duty_cycle)
+{
+ struct irblaster_dev *irb = rc->priv;
+
+ irb->duty_cycle = duty_cycle;
+ irb_set_mod(irb);
+
+ return 0;
+}
+
+static int irb_tx_ir(struct rc_dev *rc, unsigned int *buf, unsigned int len)
+{
+ unsigned long flags;
+ struct irblaster_dev *irb = rc->priv;
+
+ if (!irb_check_buf(irb, buf, len))
+ return -EINVAL;
+
+ irb->buf = kmalloc_array(len, sizeof(u32), GFP_KERNEL);
+ if (!irb->buf)
+ return -ENOMEM;
+
+ irb->buf_len = len;
+ irb->buf_head = 0;
+ irb_fill_buf(irb, buf);
+
+ reinit_completion(&irb->completion);
+
+ dev_dbg(irb->dev, "tx started, buffer length = %u\n", irb->buf_len);
+ spin_lock_irqsave(&irb->lock, flags);
+ irb_send_buffer(irb);
+ spin_unlock_irqrestore(&irb->lock, flags);
+ wait_for_completion_interruptible(&irb->completion);
+ dev_dbg(irb->dev, "tx completed\n");
+
+ spin_lock_irqsave(&irb->lock, flags);
+ kfree(irb->buf);
+ irb->buf = NULL;
+ irb->buf_len = 0;
+ spin_unlock_irqrestore(&irb->lock, flags);
+
+ return len;
+}
+
+static int irb_mod_clock_probe(struct irblaster_dev *irb, unsigned int *clk_nr)
+{
+ struct device_node *np = irb->dev->of_node;
+ struct clk *clock;
+
+ if (!np)
+ return -ENODEV;
+
+ clock = devm_clk_get(irb->dev, "xtal");
+ if (IS_ERR(clock) || clk_prepare_enable(clock))
+ return -ENODEV;
+
+ *clk_nr = IRB_MOD_XTAL3_CLK;
+ irb->clk_rate = clk_get_rate(clock) / 3;
+
+ if (irb->clk_rate < IRB_MOD_1US_CLK_RATE) {
+ *clk_nr = IRB_MOD_1US_CLK;
+ irb->clk_rate = IRB_MOD_1US_CLK_RATE;
+ }
+
+ dev_info(irb->dev, "F_clk = %luHz\n", irb->clk_rate);
+
+ return 0;
+}
+
+static int __init irblaster_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct irblaster_dev *irb;
+ struct rc_dev *rc;
+ int irq;
+ unsigned int clk_nr;
+ int ret;
+
+ irb = devm_kzalloc(dev, sizeof(*irb), GFP_KERNEL);
+ if (!irb)
+ return -ENOMEM;
+
+ irb->reg_base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(irb->reg_base))
+ return PTR_ERR(irb->reg_base);
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(dev, "no irq resource found\n");
+ return -ENODEV;
+ }
+
+ if (of_property_read_u32(dev->of_node, "max-fifo-level",
+ &irb->max_fifo_level))
+ irb->max_fifo_level = IRB_DEFAULT_MAX_FIFO_LEVEL;
+ else if (irb->max_fifo_level > IRB_FIFO_LEN)
+ irb->max_fifo_level = IRB_DEFAULT_MAX_FIFO_LEVEL;
+ dev_dbg(dev, "max FIFO level set to %u\n", irb->max_fifo_level);
+
+ irb->dev = dev;
+ irb->carrier = IRB_DEFAULT_CARRIER;
+ irb->duty_cycle = IRB_DEFAULT_DUTY_CYCLE;
+ init_completion(&irb->completion);
+ spin_lock_init(&irb->lock);
+
+ ret = irb_mod_clock_probe(irb, &clk_nr);
+ if (ret) {
+ dev_err(dev, "modulator clock setup failed\n");
+ return ret;
+ }
+ irb_setup(irb, clk_nr);
+
+ ret = devm_request_irq(dev, irq,
+ irb_irqhandler,
+ IRQF_TRIGGER_RISING,
+ DRIVER_NAME, irb);
+ if (ret) {
+ dev_err(dev, "irq request failed\n");
+ return ret;
+ }
+
+ rc = rc_allocate_device(RC_DRIVER_IR_RAW_TX);
+ if (!rc)
+ return -ENOMEM;
+
+ rc->driver_name = DRIVER_NAME;
+ rc->device_name = DEVICE_NAME;
+ rc->priv = irb;
+
+ rc->tx_ir = irb_tx_ir;
+ rc->s_tx_carrier = irb_set_tx_carrier;
+ rc->s_tx_duty_cycle = irb_set_tx_duty_cycle;
+
+ ret = rc_register_device(rc);
+ if (ret < 0) {
+ dev_err(dev, "rc_dev registration failed\n");
+ rc_free_device(rc);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, rc);
+
+ return 0;
+}
+
+static int irblaster_remove(struct platform_device *pdev)
+{
+ struct rc_dev *rc = platform_get_drvdata(pdev);
+
+ rc_unregister_device(rc);
+
+ return 0;
+}
+
+static const struct of_device_id irblaster_dt_match[] = {
+ {
+ .compatible = "amlogic,meson-g12a-irblaster",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, irblaster_dt_match);
+
+static struct platform_driver irblaster_pd = {
+ .remove = irblaster_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = irblaster_dt_match,
+ },
+};
+
+module_platform_driver_probe(irblaster_pd, irblaster_probe);
+
+MODULE_DESCRIPTION("Meson IR blaster driver");
+MODULE_AUTHOR("Viktor Prutyanov <viktor.prutyanov@phystech.edu>");
+MODULE_LICENSE("GPL");
--
2.21.0
_______________________________________________
linux-amlogic mailing list
linux-amlogic@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-amlogic
^ permalink raw reply related [flat|nested] 17+ messages in thread* [PATCH v3 2/2] media: rc: introduce Meson IR blaster driver
@ 2021-07-09 16:57 ` Viktor Prutyanov
0 siblings, 0 replies; 17+ messages in thread
From: Viktor Prutyanov @ 2021-07-09 16:57 UTC (permalink / raw)
To: sean, mchehab, robh+dt, khilman, narmstrong
Cc: jbrunet, martin.blumenstingl, linux-media, devicetree,
linux-kernel, linux-arm-kernel, linux-amlogic, rockosov,
Viktor Prutyanov
This patch adds the driver for Amlogic Meson IR blaster.
Some Amlogic SoCs such as A311D and T950D4 have IR transmitter
(blaster) controller onboard. It is capable of sending IR
signals with arbitrary carrier frequency and duty cycle.
The driver supports 3 modulation clock sources:
- sysclk
- xtal3 clock (xtal divided by 3)
- 1us clock
Signed-off-by: Viktor Prutyanov <viktor.prutyanov@phystech.edu>
---
changes in v2:
- threaded IRQ removed, all stuff done in IRQ handler
- DIV_ROUND_CLOSEST_ULL replaced with DIV_ROUND_CLOSEST
- compatible changed to "amlogic,meson-g12a-irblaster"
- 'debug' parameter removed
- dprintk() replaced with dev_dbg()/dev_info()
- carrier frequency checked against 0
- device_name added
changes in v3:
- license header fixed
- 'max_fifo_level' parameter removed
- irq and clk_nr deleted from irblaster_dev struct
- some divisions replaced with DIV_ROUND_CLOSEST
- irb_send inlined
- fixed early completion in IRQ handler
- spin lock added before kfree
drivers/media/rc/Kconfig | 10 +
drivers/media/rc/Makefile | 1 +
drivers/media/rc/meson-irblaster.c | 400 +++++++++++++++++++++++++++++
3 files changed, 411 insertions(+)
create mode 100644 drivers/media/rc/meson-irblaster.c
diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
index d0a8326b75c2..6e60348e1bcf 100644
--- a/drivers/media/rc/Kconfig
+++ b/drivers/media/rc/Kconfig
@@ -246,6 +246,16 @@ config IR_MESON
To compile this driver as a module, choose M here: the
module will be called meson-ir.
+config IR_MESON_IRBLASTER
+ tristate "Amlogic Meson IR blaster"
+ depends on ARCH_MESON || COMPILE_TEST
+ help
+ Say Y if you want to use the IR blaster available on
+ Amlogic Meson SoCs.
+
+ To compile this driver as a module, choose M here: the
+ module will be called meson-irblaster.
+
config IR_MTK
tristate "Mediatek IR remote receiver"
depends on ARCH_MEDIATEK || COMPILE_TEST
diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile
index 692e9b6b203f..b108f2b0420c 100644
--- a/drivers/media/rc/Makefile
+++ b/drivers/media/rc/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_IR_ITE_CIR) += ite-cir.o
obj-$(CONFIG_IR_MCEUSB) += mceusb.o
obj-$(CONFIG_IR_FINTEK) += fintek-cir.o
obj-$(CONFIG_IR_MESON) += meson-ir.o
+obj-$(CONFIG_IR_MESON_IRBLASTER) += meson-irblaster.o
obj-$(CONFIG_IR_NUVOTON) += nuvoton-cir.o
obj-$(CONFIG_IR_ENE) += ene_ir.o
obj-$(CONFIG_IR_REDRAT3) += redrat3.o
diff --git a/drivers/media/rc/meson-irblaster.c b/drivers/media/rc/meson-irblaster.c
new file mode 100644
index 000000000000..758d9abf252e
--- /dev/null
+++ b/drivers/media/rc/meson-irblaster.c
@@ -0,0 +1,400 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/**
+ * meson-irblaster.c - Amlogic Meson IR blaster driver
+ *
+ * Copyright (c) 2021, SberDevices. All Rights Reserved.
+ *
+ * Author: Viktor Prutyanov <viktor.prutyanov@phystech.edu>
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/of_irq.h>
+#include <linux/clk.h>
+#include <linux/slab.h>
+#include <media/rc-core.h>
+
+#define DEVICE_NAME "Meson IR blaster"
+#define DRIVER_NAME "meson-irblaster"
+
+#define IRB_MOD_1US_CLK_RATE 1000000
+
+#define IRB_DEFAULT_CARRIER 38000
+#define IRB_DEFAULT_DUTY_CYCLE 50
+
+#define IRB_FIFO_LEN 128
+#define IRB_DEFAULT_MAX_FIFO_LEVEL 96
+
+#define IRB_ADDR0 0x0
+#define IRB_ADDR1 0x4
+#define IRB_ADDR2 0x8
+#define IRB_ADDR3 0xc
+
+#define IRB_MAX_DELAY (1 << 10)
+#define IRB_DELAY_MASK (IRB_MAX_DELAY - 1)
+
+/* IRCTRL_IR_BLASTER_ADDR0 */
+#define IRB_MOD_CLK(x) ((x) << 12)
+#define IRB_MOD_SYS_CLK 0
+#define IRB_MOD_XTAL3_CLK 1
+#define IRB_MOD_1US_CLK 2
+#define IRB_MOD_10US_CLK 3
+#define IRB_INIT_HIGH BIT(2)
+#define IRB_ENABLE BIT(0)
+
+/* IRCTRL_IR_BLASTER_ADDR2 */
+#define IRB_MOD_COUNT(lo, hi) ((((lo) - 1) << 16) | ((hi) - 1))
+
+/* IRCTRL_IR_BLASTER_ADDR2 */
+#define IRB_WRITE_FIFO BIT(16)
+#define IRB_MOD_ENABLE BIT(12)
+#define IRB_TB_1US (0x0 << 10)
+#define IRB_TB_10US (0x1 << 10)
+#define IRB_TB_100US (0x2 << 10)
+#define IRB_TB_MOD_CLK (0x3 << 10)
+
+/* IRCTRL_IR_BLASTER_ADDR3 */
+#define IRB_FIFO_THD_PENDING BIT(16)
+#define IRB_FIFO_IRQ_ENABLE BIT(8)
+
+struct irblaster_dev {
+ struct device *dev;
+ void __iomem *reg_base;
+ u32 *buf;
+ unsigned int buf_len;
+ unsigned int buf_head;
+ unsigned int carrier;
+ unsigned int duty_cycle;
+ spinlock_t lock;
+ struct completion completion;
+ unsigned int max_fifo_level;
+ unsigned long clk_rate;
+};
+
+static void irb_set_mod(struct irblaster_dev *irb)
+{
+ unsigned int cnt = DIV_ROUND_CLOSEST(irb->clk_rate, irb->carrier);
+ unsigned int pulse_cnt = DIV_ROUND_CLOSEST(cnt * irb->duty_cycle, 100);
+ unsigned int space_cnt = cnt - pulse_cnt;
+
+ dev_dbg(irb->dev, "F_mod = %uHz, T_mod = %luns, duty_cycle = %u%%\n",
+ irb->carrier, NSEC_PER_SEC / irb->clk_rate * cnt,
+ 100 * pulse_cnt / cnt);
+
+ writel(IRB_MOD_COUNT(pulse_cnt, space_cnt),
+ irb->reg_base + IRB_ADDR1);
+}
+
+static void irb_setup(struct irblaster_dev *irb, unsigned int clk_nr)
+{
+ unsigned int fifo_irq_threshold = IRB_FIFO_LEN - irb->max_fifo_level;
+
+ /*
+ * Disable the blaster, set modulator clock tick and set initialize
+ * output to be high. Set up carrier frequency and duty cycle. Then
+ * unset initialize output. Enable FIFO interrupt, set FIFO interrupt
+ * threshold. Finally, enable the blaster back.
+ */
+ writel(~IRB_ENABLE & (IRB_MOD_CLK(clk_nr) | IRB_INIT_HIGH),
+ irb->reg_base + IRB_ADDR0);
+ irb_set_mod(irb);
+ writel(readl(irb->reg_base + IRB_ADDR0) & ~IRB_INIT_HIGH,
+ irb->reg_base + IRB_ADDR0);
+ writel(IRB_FIFO_IRQ_ENABLE | fifo_irq_threshold,
+ irb->reg_base + IRB_ADDR3);
+ writel(readl(irb->reg_base + IRB_ADDR0) | IRB_ENABLE,
+ irb->reg_base + IRB_ADDR0);
+}
+
+static u32 irb_prepare_pulse(struct irblaster_dev *irb, unsigned int time)
+{
+ unsigned int delay;
+ unsigned int tb = IRB_TB_MOD_CLK;
+ unsigned int tb_us = DIV_ROUND_CLOSEST(USEC_PER_SEC, irb->carrier);
+
+ delay = (DIV_ROUND_CLOSEST(time, tb_us) - 1) & IRB_DELAY_MASK;
+
+ return ((IRB_WRITE_FIFO | IRB_MOD_ENABLE) | tb | delay);
+}
+
+static u32 irb_prepare_space(struct irblaster_dev *irb, unsigned int time)
+{
+ unsigned int delay;
+ unsigned int tb = IRB_TB_100US;
+ unsigned int tb_us = 100;
+
+ if (time <= IRB_MAX_DELAY) {
+ tb = IRB_TB_1US;
+ tb_us = 1;
+ } else if (time <= 10 * IRB_MAX_DELAY) {
+ tb = IRB_TB_10US;
+ tb_us = 10;
+ } else if (time <= 100 * IRB_MAX_DELAY) {
+ tb = IRB_TB_100US;
+ tb_us = 100;
+ }
+
+ delay = (DIV_ROUND_CLOSEST(time, tb_us) - 1) & IRB_DELAY_MASK;
+
+ return ((IRB_WRITE_FIFO & ~IRB_MOD_ENABLE) | tb | delay);
+}
+
+static void irb_send_buffer(struct irblaster_dev *irb)
+{
+ unsigned int nr = 0;
+
+ while (irb->buf_head < irb->buf_len && nr < irb->max_fifo_level) {
+ writel(irb->buf[irb->buf_head], irb->reg_base + IRB_ADDR2);
+
+ irb->buf_head++;
+ nr++;
+ }
+}
+
+static bool irb_check_buf(struct irblaster_dev *irb,
+ unsigned int *buf, unsigned int len)
+{
+ unsigned int i;
+
+ for (i = 0; i < len; i++) {
+ unsigned int max_tb_us;
+ /*
+ * Max space timebase is 100 us.
+ * Pulse timebase equals to carrier period.
+ */
+ if (i % 2 == 0)
+ max_tb_us = USEC_PER_SEC / irb->carrier;
+ else
+ max_tb_us = 100;
+
+ if (buf[i] >= max_tb_us * IRB_MAX_DELAY)
+ return false;
+ }
+
+ return true;
+}
+
+static void irb_fill_buf(struct irblaster_dev *irb, unsigned int *buf)
+{
+ unsigned int i;
+
+ for (i = 0; i < irb->buf_len; i++) {
+ if (i % 2 == 0)
+ irb->buf[i] = irb_prepare_pulse(irb, buf[i]);
+ else
+ irb->buf[i] = irb_prepare_space(irb, buf[i]);
+ }
+}
+
+static irqreturn_t irb_irqhandler(int irq, void *data)
+{
+ unsigned long flags;
+ struct irblaster_dev *irb = data;
+
+ writel(readl(irb->reg_base + IRB_ADDR3) & ~IRB_FIFO_THD_PENDING,
+ irb->reg_base + IRB_ADDR3);
+
+ spin_lock_irqsave(&irb->lock, flags);
+ if (irb->buf_head < irb->buf_len)
+ irb_send_buffer(irb);
+ else
+ complete(&irb->completion);
+ spin_unlock_irqrestore(&irb->lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+static int irb_set_tx_carrier(struct rc_dev *rc, u32 carrier)
+{
+ struct irblaster_dev *irb = rc->priv;
+
+ if (carrier == 0)
+ return -EINVAL;
+
+ irb->carrier = carrier;
+ irb_set_mod(irb);
+
+ return 0;
+}
+
+static int irb_set_tx_duty_cycle(struct rc_dev *rc, u32 duty_cycle)
+{
+ struct irblaster_dev *irb = rc->priv;
+
+ irb->duty_cycle = duty_cycle;
+ irb_set_mod(irb);
+
+ return 0;
+}
+
+static int irb_tx_ir(struct rc_dev *rc, unsigned int *buf, unsigned int len)
+{
+ unsigned long flags;
+ struct irblaster_dev *irb = rc->priv;
+
+ if (!irb_check_buf(irb, buf, len))
+ return -EINVAL;
+
+ irb->buf = kmalloc_array(len, sizeof(u32), GFP_KERNEL);
+ if (!irb->buf)
+ return -ENOMEM;
+
+ irb->buf_len = len;
+ irb->buf_head = 0;
+ irb_fill_buf(irb, buf);
+
+ reinit_completion(&irb->completion);
+
+ dev_dbg(irb->dev, "tx started, buffer length = %u\n", irb->buf_len);
+ spin_lock_irqsave(&irb->lock, flags);
+ irb_send_buffer(irb);
+ spin_unlock_irqrestore(&irb->lock, flags);
+ wait_for_completion_interruptible(&irb->completion);
+ dev_dbg(irb->dev, "tx completed\n");
+
+ spin_lock_irqsave(&irb->lock, flags);
+ kfree(irb->buf);
+ irb->buf = NULL;
+ irb->buf_len = 0;
+ spin_unlock_irqrestore(&irb->lock, flags);
+
+ return len;
+}
+
+static int irb_mod_clock_probe(struct irblaster_dev *irb, unsigned int *clk_nr)
+{
+ struct device_node *np = irb->dev->of_node;
+ struct clk *clock;
+
+ if (!np)
+ return -ENODEV;
+
+ clock = devm_clk_get(irb->dev, "xtal");
+ if (IS_ERR(clock) || clk_prepare_enable(clock))
+ return -ENODEV;
+
+ *clk_nr = IRB_MOD_XTAL3_CLK;
+ irb->clk_rate = clk_get_rate(clock) / 3;
+
+ if (irb->clk_rate < IRB_MOD_1US_CLK_RATE) {
+ *clk_nr = IRB_MOD_1US_CLK;
+ irb->clk_rate = IRB_MOD_1US_CLK_RATE;
+ }
+
+ dev_info(irb->dev, "F_clk = %luHz\n", irb->clk_rate);
+
+ return 0;
+}
+
+static int __init irblaster_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct irblaster_dev *irb;
+ struct rc_dev *rc;
+ int irq;
+ unsigned int clk_nr;
+ int ret;
+
+ irb = devm_kzalloc(dev, sizeof(*irb), GFP_KERNEL);
+ if (!irb)
+ return -ENOMEM;
+
+ irb->reg_base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(irb->reg_base))
+ return PTR_ERR(irb->reg_base);
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(dev, "no irq resource found\n");
+ return -ENODEV;
+ }
+
+ if (of_property_read_u32(dev->of_node, "max-fifo-level",
+ &irb->max_fifo_level))
+ irb->max_fifo_level = IRB_DEFAULT_MAX_FIFO_LEVEL;
+ else if (irb->max_fifo_level > IRB_FIFO_LEN)
+ irb->max_fifo_level = IRB_DEFAULT_MAX_FIFO_LEVEL;
+ dev_dbg(dev, "max FIFO level set to %u\n", irb->max_fifo_level);
+
+ irb->dev = dev;
+ irb->carrier = IRB_DEFAULT_CARRIER;
+ irb->duty_cycle = IRB_DEFAULT_DUTY_CYCLE;
+ init_completion(&irb->completion);
+ spin_lock_init(&irb->lock);
+
+ ret = irb_mod_clock_probe(irb, &clk_nr);
+ if (ret) {
+ dev_err(dev, "modulator clock setup failed\n");
+ return ret;
+ }
+ irb_setup(irb, clk_nr);
+
+ ret = devm_request_irq(dev, irq,
+ irb_irqhandler,
+ IRQF_TRIGGER_RISING,
+ DRIVER_NAME, irb);
+ if (ret) {
+ dev_err(dev, "irq request failed\n");
+ return ret;
+ }
+
+ rc = rc_allocate_device(RC_DRIVER_IR_RAW_TX);
+ if (!rc)
+ return -ENOMEM;
+
+ rc->driver_name = DRIVER_NAME;
+ rc->device_name = DEVICE_NAME;
+ rc->priv = irb;
+
+ rc->tx_ir = irb_tx_ir;
+ rc->s_tx_carrier = irb_set_tx_carrier;
+ rc->s_tx_duty_cycle = irb_set_tx_duty_cycle;
+
+ ret = rc_register_device(rc);
+ if (ret < 0) {
+ dev_err(dev, "rc_dev registration failed\n");
+ rc_free_device(rc);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, rc);
+
+ return 0;
+}
+
+static int irblaster_remove(struct platform_device *pdev)
+{
+ struct rc_dev *rc = platform_get_drvdata(pdev);
+
+ rc_unregister_device(rc);
+
+ return 0;
+}
+
+static const struct of_device_id irblaster_dt_match[] = {
+ {
+ .compatible = "amlogic,meson-g12a-irblaster",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, irblaster_dt_match);
+
+static struct platform_driver irblaster_pd = {
+ .remove = irblaster_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = irblaster_dt_match,
+ },
+};
+
+module_platform_driver_probe(irblaster_pd, irblaster_probe);
+
+MODULE_DESCRIPTION("Meson IR blaster driver");
+MODULE_AUTHOR("Viktor Prutyanov <viktor.prutyanov@phystech.edu>");
+MODULE_LICENSE("GPL");
--
2.21.0
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 17+ messages in thread* Re: [PATCH v3 2/2] media: rc: introduce Meson IR blaster driver
2021-07-09 16:57 ` Viktor Prutyanov
@ 2021-07-09 21:32 ` kernel test robot
-1 siblings, 0 replies; 17+ messages in thread
From: kernel test robot @ 2021-07-09 21:32 UTC (permalink / raw)
To: Viktor Prutyanov, sean, mchehab, robh+dt, khilman, narmstrong
Cc: kbuild-all, jbrunet, martin.blumenstingl, linux-media,
devicetree, linux-kernel
[-- Attachment #1: Type: text/plain, Size: 1888 bytes --]
Hi Viktor,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on linuxtv-media/master]
[also build test WARNING on v5.13 next-20210709]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Viktor-Prutyanov/media-rc-add-support-for-Amlogic-Meson-IR-blaster/20210710-005842
base: git://linuxtv.org/media_tree.git master
config: m68k-allmodconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/0day-ci/linux/commit/34b352cca3f642ac8428b92aba7ed7a5e88e36b1
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Viktor-Prutyanov/media-rc-add-support-for-Amlogic-Meson-IR-blaster/20210710-005842
git checkout 34b352cca3f642ac8428b92aba7ed7a5e88e36b1
# save the attached .config to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross O=build_dir ARCH=m68k SHELL=/bin/bash drivers/media/rc/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
>> drivers/media/rc/meson-irblaster.c:22: warning: expecting prototype for meson(). Prototype was for DEVICE_NAME() instead
vim +22 drivers/media/rc/meson-irblaster.c
21
> 22 #define DEVICE_NAME "Meson IR blaster"
23 #define DRIVER_NAME "meson-irblaster"
24
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 60297 bytes --]
^ permalink raw reply [flat|nested] 17+ messages in thread* Re: [PATCH v3 2/2] media: rc: introduce Meson IR blaster driver
2021-07-09 16:57 ` Viktor Prutyanov
(?)
@ 2021-07-09 22:11 ` Sean Young
-1 siblings, 0 replies; 17+ messages in thread
From: Sean Young @ 2021-07-09 22:11 UTC (permalink / raw)
To: Viktor Prutyanov
Cc: mchehab, robh+dt, khilman, narmstrong, jbrunet,
martin.blumenstingl, linux-media, devicetree, linux-kernel,
linux-arm-kernel, linux-amlogic, rockosov
Hi Viktor,
The driver look great! Thanks for making those changes. Just two minor
comments.
On Fri, Jul 09, 2021 at 07:57:53PM +0300, Viktor Prutyanov wrote:
> This patch adds the driver for Amlogic Meson IR blaster.
>
> Some Amlogic SoCs such as A311D and T950D4 have IR transmitter
> (blaster) controller onboard. It is capable of sending IR
> signals with arbitrary carrier frequency and duty cycle.
>
> The driver supports 3 modulation clock sources:
> - sysclk
> - xtal3 clock (xtal divided by 3)
> - 1us clock
>
> Signed-off-by: Viktor Prutyanov <viktor.prutyanov@phystech.edu>
> ---
> changes in v2:
> - threaded IRQ removed, all stuff done in IRQ handler
> - DIV_ROUND_CLOSEST_ULL replaced with DIV_ROUND_CLOSEST
> - compatible changed to "amlogic,meson-g12a-irblaster"
> - 'debug' parameter removed
> - dprintk() replaced with dev_dbg()/dev_info()
> - carrier frequency checked against 0
> - device_name added
> changes in v3:
> - license header fixed
> - 'max_fifo_level' parameter removed
> - irq and clk_nr deleted from irblaster_dev struct
> - some divisions replaced with DIV_ROUND_CLOSEST
> - irb_send inlined
> - fixed early completion in IRQ handler
> - spin lock added before kfree
>
> drivers/media/rc/Kconfig | 10 +
> drivers/media/rc/Makefile | 1 +
> drivers/media/rc/meson-irblaster.c | 400 +++++++++++++++++++++++++++++
> 3 files changed, 411 insertions(+)
> create mode 100644 drivers/media/rc/meson-irblaster.c
>
> diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
> index d0a8326b75c2..6e60348e1bcf 100644
> --- a/drivers/media/rc/Kconfig
> +++ b/drivers/media/rc/Kconfig
> @@ -246,6 +246,16 @@ config IR_MESON
> To compile this driver as a module, choose M here: the
> module will be called meson-ir.
>
> +config IR_MESON_IRBLASTER
> + tristate "Amlogic Meson IR blaster"
> + depends on ARCH_MESON || COMPILE_TEST
> + help
> + Say Y if you want to use the IR blaster available on
> + Amlogic Meson SoCs.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called meson-irblaster.
> +
> config IR_MTK
> tristate "Mediatek IR remote receiver"
> depends on ARCH_MEDIATEK || COMPILE_TEST
> diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile
> index 692e9b6b203f..b108f2b0420c 100644
> --- a/drivers/media/rc/Makefile
> +++ b/drivers/media/rc/Makefile
> @@ -28,6 +28,7 @@ obj-$(CONFIG_IR_ITE_CIR) += ite-cir.o
> obj-$(CONFIG_IR_MCEUSB) += mceusb.o
> obj-$(CONFIG_IR_FINTEK) += fintek-cir.o
> obj-$(CONFIG_IR_MESON) += meson-ir.o
> +obj-$(CONFIG_IR_MESON_IRBLASTER) += meson-irblaster.o
> obj-$(CONFIG_IR_NUVOTON) += nuvoton-cir.o
> obj-$(CONFIG_IR_ENE) += ene_ir.o
> obj-$(CONFIG_IR_REDRAT3) += redrat3.o
> diff --git a/drivers/media/rc/meson-irblaster.c b/drivers/media/rc/meson-irblaster.c
> new file mode 100644
> index 000000000000..758d9abf252e
> --- /dev/null
> +++ b/drivers/media/rc/meson-irblaster.c
> @@ -0,0 +1,400 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/**
> + * meson-irblaster.c - Amlogic Meson IR blaster driver
> + *
> + * Copyright (c) 2021, SberDevices. All Rights Reserved.
> + *
> + * Author: Viktor Prutyanov <viktor.prutyanov@phystech.edu>
> + */
> +
> +#include <linux/device.h>
> +#include <linux/module.h>
> +#include <linux/sched.h>
> +#include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/interrupt.h>
> +#include <linux/spinlock.h>
> +#include <linux/of_irq.h>
> +#include <linux/clk.h>
> +#include <linux/slab.h>
> +#include <media/rc-core.h>
> +
> +#define DEVICE_NAME "Meson IR blaster"
> +#define DRIVER_NAME "meson-irblaster"
This driver uses the term "blaster" rather "transmitter" or "tx". Is
there a good reason for this? None of the other IR transmitters use the
term blaster; the rc core kapi also only talks about tx.
"IR Blaster" seems like a marketing term for what is essentially a led
switching on and off.
> +
> +#define IRB_MOD_1US_CLK_RATE 1000000
> +
> +#define IRB_DEFAULT_CARRIER 38000
> +#define IRB_DEFAULT_DUTY_CYCLE 50
> +
> +#define IRB_FIFO_LEN 128
> +#define IRB_DEFAULT_MAX_FIFO_LEVEL 96
> +
> +#define IRB_ADDR0 0x0
> +#define IRB_ADDR1 0x4
> +#define IRB_ADDR2 0x8
> +#define IRB_ADDR3 0xc
> +
> +#define IRB_MAX_DELAY (1 << 10)
> +#define IRB_DELAY_MASK (IRB_MAX_DELAY - 1)
> +
> +/* IRCTRL_IR_BLASTER_ADDR0 */
> +#define IRB_MOD_CLK(x) ((x) << 12)
> +#define IRB_MOD_SYS_CLK 0
> +#define IRB_MOD_XTAL3_CLK 1
> +#define IRB_MOD_1US_CLK 2
> +#define IRB_MOD_10US_CLK 3
> +#define IRB_INIT_HIGH BIT(2)
> +#define IRB_ENABLE BIT(0)
> +
> +/* IRCTRL_IR_BLASTER_ADDR2 */
> +#define IRB_MOD_COUNT(lo, hi) ((((lo) - 1) << 16) | ((hi) - 1))
> +
> +/* IRCTRL_IR_BLASTER_ADDR2 */
> +#define IRB_WRITE_FIFO BIT(16)
> +#define IRB_MOD_ENABLE BIT(12)
> +#define IRB_TB_1US (0x0 << 10)
> +#define IRB_TB_10US (0x1 << 10)
> +#define IRB_TB_100US (0x2 << 10)
> +#define IRB_TB_MOD_CLK (0x3 << 10)
> +
> +/* IRCTRL_IR_BLASTER_ADDR3 */
> +#define IRB_FIFO_THD_PENDING BIT(16)
> +#define IRB_FIFO_IRQ_ENABLE BIT(8)
> +
> +struct irblaster_dev {
> + struct device *dev;
> + void __iomem *reg_base;
> + u32 *buf;
> + unsigned int buf_len;
> + unsigned int buf_head;
> + unsigned int carrier;
> + unsigned int duty_cycle;
> + spinlock_t lock;
> + struct completion completion;
> + unsigned int max_fifo_level;
> + unsigned long clk_rate;
> +};
> +
> +static void irb_set_mod(struct irblaster_dev *irb)
> +{
> + unsigned int cnt = DIV_ROUND_CLOSEST(irb->clk_rate, irb->carrier);
> + unsigned int pulse_cnt = DIV_ROUND_CLOSEST(cnt * irb->duty_cycle, 100);
> + unsigned int space_cnt = cnt - pulse_cnt;
> +
> + dev_dbg(irb->dev, "F_mod = %uHz, T_mod = %luns, duty_cycle = %u%%\n",
> + irb->carrier, NSEC_PER_SEC / irb->clk_rate * cnt,
> + 100 * pulse_cnt / cnt);
> +
> + writel(IRB_MOD_COUNT(pulse_cnt, space_cnt),
> + irb->reg_base + IRB_ADDR1);
> +}
> +
> +static void irb_setup(struct irblaster_dev *irb, unsigned int clk_nr)
> +{
> + unsigned int fifo_irq_threshold = IRB_FIFO_LEN - irb->max_fifo_level;
> +
> + /*
> + * Disable the blaster, set modulator clock tick and set initialize
> + * output to be high. Set up carrier frequency and duty cycle. Then
> + * unset initialize output. Enable FIFO interrupt, set FIFO interrupt
> + * threshold. Finally, enable the blaster back.
> + */
> + writel(~IRB_ENABLE & (IRB_MOD_CLK(clk_nr) | IRB_INIT_HIGH),
> + irb->reg_base + IRB_ADDR0);
> + irb_set_mod(irb);
> + writel(readl(irb->reg_base + IRB_ADDR0) & ~IRB_INIT_HIGH,
> + irb->reg_base + IRB_ADDR0);
> + writel(IRB_FIFO_IRQ_ENABLE | fifo_irq_threshold,
> + irb->reg_base + IRB_ADDR3);
> + writel(readl(irb->reg_base + IRB_ADDR0) | IRB_ENABLE,
> + irb->reg_base + IRB_ADDR0);
> +}
> +
> +static u32 irb_prepare_pulse(struct irblaster_dev *irb, unsigned int time)
> +{
> + unsigned int delay;
> + unsigned int tb = IRB_TB_MOD_CLK;
> + unsigned int tb_us = DIV_ROUND_CLOSEST(USEC_PER_SEC, irb->carrier);
> +
> + delay = (DIV_ROUND_CLOSEST(time, tb_us) - 1) & IRB_DELAY_MASK;
> +
> + return ((IRB_WRITE_FIFO | IRB_MOD_ENABLE) | tb | delay);
> +}
> +
> +static u32 irb_prepare_space(struct irblaster_dev *irb, unsigned int time)
> +{
> + unsigned int delay;
> + unsigned int tb = IRB_TB_100US;
> + unsigned int tb_us = 100;
> +
> + if (time <= IRB_MAX_DELAY) {
> + tb = IRB_TB_1US;
> + tb_us = 1;
> + } else if (time <= 10 * IRB_MAX_DELAY) {
> + tb = IRB_TB_10US;
> + tb_us = 10;
> + } else if (time <= 100 * IRB_MAX_DELAY) {
> + tb = IRB_TB_100US;
> + tb_us = 100;
> + }
> +
> + delay = (DIV_ROUND_CLOSEST(time, tb_us) - 1) & IRB_DELAY_MASK;
> +
> + return ((IRB_WRITE_FIFO & ~IRB_MOD_ENABLE) | tb | delay);
> +}
> +
> +static void irb_send_buffer(struct irblaster_dev *irb)
> +{
> + unsigned int nr = 0;
> +
> + while (irb->buf_head < irb->buf_len && nr < irb->max_fifo_level) {
> + writel(irb->buf[irb->buf_head], irb->reg_base + IRB_ADDR2);
> +
> + irb->buf_head++;
> + nr++;
> + }
> +}
> +
> +static bool irb_check_buf(struct irblaster_dev *irb,
> + unsigned int *buf, unsigned int len)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < len; i++) {
> + unsigned int max_tb_us;
> + /*
> + * Max space timebase is 100 us.
> + * Pulse timebase equals to carrier period.
> + */
> + if (i % 2 == 0)
> + max_tb_us = USEC_PER_SEC / irb->carrier;
> + else
> + max_tb_us = 100;
> +
> + if (buf[i] >= max_tb_us * IRB_MAX_DELAY)
> + return false;
> + }
> +
> + return true;
> +}
> +
> +static void irb_fill_buf(struct irblaster_dev *irb, unsigned int *buf)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < irb->buf_len; i++) {
> + if (i % 2 == 0)
> + irb->buf[i] = irb_prepare_pulse(irb, buf[i]);
> + else
> + irb->buf[i] = irb_prepare_space(irb, buf[i]);
> + }
> +}
> +
> +static irqreturn_t irb_irqhandler(int irq, void *data)
> +{
> + unsigned long flags;
> + struct irblaster_dev *irb = data;
> +
> + writel(readl(irb->reg_base + IRB_ADDR3) & ~IRB_FIFO_THD_PENDING,
> + irb->reg_base + IRB_ADDR3);
> +
> + spin_lock_irqsave(&irb->lock, flags);
> + if (irb->buf_head < irb->buf_len)
> + irb_send_buffer(irb);
> + else
> + complete(&irb->completion);
> + spin_unlock_irqrestore(&irb->lock, flags);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int irb_set_tx_carrier(struct rc_dev *rc, u32 carrier)
> +{
> + struct irblaster_dev *irb = rc->priv;
> +
> + if (carrier == 0)
> + return -EINVAL;
> +
> + irb->carrier = carrier;
> + irb_set_mod(irb);
> +
> + return 0;
> +}
> +
> +static int irb_set_tx_duty_cycle(struct rc_dev *rc, u32 duty_cycle)
> +{
> + struct irblaster_dev *irb = rc->priv;
> +
> + irb->duty_cycle = duty_cycle;
> + irb_set_mod(irb);
> +
> + return 0;
> +}
> +
> +static int irb_tx_ir(struct rc_dev *rc, unsigned int *buf, unsigned int len)
> +{
> + unsigned long flags;
> + struct irblaster_dev *irb = rc->priv;
> +
> + if (!irb_check_buf(irb, buf, len))
> + return -EINVAL;
> +
> + irb->buf = kmalloc_array(len, sizeof(u32), GFP_KERNEL);
Right now the interrupt handler could still called, if the previous tx
was interrupted early with a signal. This should also be in spinlock
so we make sure we are not sending garbage.
> + if (!irb->buf)
> + return -ENOMEM;
> +
> + irb->buf_len = len;
> + irb->buf_head = 0;
> + irb_fill_buf(irb, buf);
> +
> + reinit_completion(&irb->completion);
> +
> + dev_dbg(irb->dev, "tx started, buffer length = %u\n", irb->buf_len);
> + spin_lock_irqsave(&irb->lock, flags);
> + irb_send_buffer(irb);
> + spin_unlock_irqrestore(&irb->lock, flags);
> + wait_for_completion_interruptible(&irb->completion);
> + dev_dbg(irb->dev, "tx completed\n");
Here the debug talks about tx, not blasting.
> +
> + spin_lock_irqsave(&irb->lock, flags);
> + kfree(irb->buf);
> + irb->buf = NULL;
> + irb->buf_len = 0;
> + spin_unlock_irqrestore(&irb->lock, flags);
> +
> + return len;
> +}
> +
> +static int irb_mod_clock_probe(struct irblaster_dev *irb, unsigned int *clk_nr)
> +{
> + struct device_node *np = irb->dev->of_node;
> + struct clk *clock;
> +
> + if (!np)
> + return -ENODEV;
> +
> + clock = devm_clk_get(irb->dev, "xtal");
> + if (IS_ERR(clock) || clk_prepare_enable(clock))
> + return -ENODEV;
> +
> + *clk_nr = IRB_MOD_XTAL3_CLK;
> + irb->clk_rate = clk_get_rate(clock) / 3;
> +
> + if (irb->clk_rate < IRB_MOD_1US_CLK_RATE) {
> + *clk_nr = IRB_MOD_1US_CLK;
> + irb->clk_rate = IRB_MOD_1US_CLK_RATE;
> + }
> +
> + dev_info(irb->dev, "F_clk = %luHz\n", irb->clk_rate);
> +
> + return 0;
> +}
> +
> +static int __init irblaster_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct irblaster_dev *irb;
> + struct rc_dev *rc;
> + int irq;
> + unsigned int clk_nr;
> + int ret;
> +
> + irb = devm_kzalloc(dev, sizeof(*irb), GFP_KERNEL);
> + if (!irb)
> + return -ENOMEM;
> +
> + irb->reg_base = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(irb->reg_base))
> + return PTR_ERR(irb->reg_base);
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0) {
> + dev_err(dev, "no irq resource found\n");
> + return -ENODEV;
> + }
> +
> + if (of_property_read_u32(dev->of_node, "max-fifo-level",
> + &irb->max_fifo_level))
> + irb->max_fifo_level = IRB_DEFAULT_MAX_FIFO_LEVEL;
> + else if (irb->max_fifo_level > IRB_FIFO_LEN)
> + irb->max_fifo_level = IRB_DEFAULT_MAX_FIFO_LEVEL;
> + dev_dbg(dev, "max FIFO level set to %u\n", irb->max_fifo_level);
> +
> + irb->dev = dev;
> + irb->carrier = IRB_DEFAULT_CARRIER;
> + irb->duty_cycle = IRB_DEFAULT_DUTY_CYCLE;
> + init_completion(&irb->completion);
> + spin_lock_init(&irb->lock);
> +
> + ret = irb_mod_clock_probe(irb, &clk_nr);
> + if (ret) {
> + dev_err(dev, "modulator clock setup failed\n");
> + return ret;
> + }
> + irb_setup(irb, clk_nr);
> +
> + ret = devm_request_irq(dev, irq,
> + irb_irqhandler,
> + IRQF_TRIGGER_RISING,
> + DRIVER_NAME, irb);
> + if (ret) {
> + dev_err(dev, "irq request failed\n");
> + return ret;
> + }
> +
> + rc = rc_allocate_device(RC_DRIVER_IR_RAW_TX);
> + if (!rc)
> + return -ENOMEM;
> +
> + rc->driver_name = DRIVER_NAME;
> + rc->device_name = DEVICE_NAME;
> + rc->priv = irb;
> +
> + rc->tx_ir = irb_tx_ir;
> + rc->s_tx_carrier = irb_set_tx_carrier;
> + rc->s_tx_duty_cycle = irb_set_tx_duty_cycle;
> +
> + ret = rc_register_device(rc);
> + if (ret < 0) {
> + dev_err(dev, "rc_dev registration failed\n");
> + rc_free_device(rc);
> + return ret;
> + }
> +
> + platform_set_drvdata(pdev, rc);
> +
> + return 0;
> +}
> +
> +static int irblaster_remove(struct platform_device *pdev)
> +{
> + struct rc_dev *rc = platform_get_drvdata(pdev);
> +
> + rc_unregister_device(rc);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id irblaster_dt_match[] = {
> + {
> + .compatible = "amlogic,meson-g12a-irblaster",
> + },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, irblaster_dt_match);
> +
> +static struct platform_driver irblaster_pd = {
> + .remove = irblaster_remove,
> + .driver = {
> + .name = DRIVER_NAME,
> + .owner = THIS_MODULE,
> + .of_match_table = irblaster_dt_match,
> + },
> +};
> +
> +module_platform_driver_probe(irblaster_pd, irblaster_probe);
> +
> +MODULE_DESCRIPTION("Meson IR blaster driver");
> +MODULE_AUTHOR("Viktor Prutyanov <viktor.prutyanov@phystech.edu>");
> +MODULE_LICENSE("GPL");
> --
> 2.21.0
^ permalink raw reply [flat|nested] 17+ messages in thread* Re: [PATCH v3 2/2] media: rc: introduce Meson IR blaster driver
@ 2021-07-09 22:11 ` Sean Young
0 siblings, 0 replies; 17+ messages in thread
From: Sean Young @ 2021-07-09 22:11 UTC (permalink / raw)
To: Viktor Prutyanov
Cc: mchehab, robh+dt, khilman, narmstrong, jbrunet,
martin.blumenstingl, linux-media, devicetree, linux-kernel,
linux-arm-kernel, linux-amlogic, rockosov
Hi Viktor,
The driver look great! Thanks for making those changes. Just two minor
comments.
On Fri, Jul 09, 2021 at 07:57:53PM +0300, Viktor Prutyanov wrote:
> This patch adds the driver for Amlogic Meson IR blaster.
>
> Some Amlogic SoCs such as A311D and T950D4 have IR transmitter
> (blaster) controller onboard. It is capable of sending IR
> signals with arbitrary carrier frequency and duty cycle.
>
> The driver supports 3 modulation clock sources:
> - sysclk
> - xtal3 clock (xtal divided by 3)
> - 1us clock
>
> Signed-off-by: Viktor Prutyanov <viktor.prutyanov@phystech.edu>
> ---
> changes in v2:
> - threaded IRQ removed, all stuff done in IRQ handler
> - DIV_ROUND_CLOSEST_ULL replaced with DIV_ROUND_CLOSEST
> - compatible changed to "amlogic,meson-g12a-irblaster"
> - 'debug' parameter removed
> - dprintk() replaced with dev_dbg()/dev_info()
> - carrier frequency checked against 0
> - device_name added
> changes in v3:
> - license header fixed
> - 'max_fifo_level' parameter removed
> - irq and clk_nr deleted from irblaster_dev struct
> - some divisions replaced with DIV_ROUND_CLOSEST
> - irb_send inlined
> - fixed early completion in IRQ handler
> - spin lock added before kfree
>
> drivers/media/rc/Kconfig | 10 +
> drivers/media/rc/Makefile | 1 +
> drivers/media/rc/meson-irblaster.c | 400 +++++++++++++++++++++++++++++
> 3 files changed, 411 insertions(+)
> create mode 100644 drivers/media/rc/meson-irblaster.c
>
> diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
> index d0a8326b75c2..6e60348e1bcf 100644
> --- a/drivers/media/rc/Kconfig
> +++ b/drivers/media/rc/Kconfig
> @@ -246,6 +246,16 @@ config IR_MESON
> To compile this driver as a module, choose M here: the
> module will be called meson-ir.
>
> +config IR_MESON_IRBLASTER
> + tristate "Amlogic Meson IR blaster"
> + depends on ARCH_MESON || COMPILE_TEST
> + help
> + Say Y if you want to use the IR blaster available on
> + Amlogic Meson SoCs.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called meson-irblaster.
> +
> config IR_MTK
> tristate "Mediatek IR remote receiver"
> depends on ARCH_MEDIATEK || COMPILE_TEST
> diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile
> index 692e9b6b203f..b108f2b0420c 100644
> --- a/drivers/media/rc/Makefile
> +++ b/drivers/media/rc/Makefile
> @@ -28,6 +28,7 @@ obj-$(CONFIG_IR_ITE_CIR) += ite-cir.o
> obj-$(CONFIG_IR_MCEUSB) += mceusb.o
> obj-$(CONFIG_IR_FINTEK) += fintek-cir.o
> obj-$(CONFIG_IR_MESON) += meson-ir.o
> +obj-$(CONFIG_IR_MESON_IRBLASTER) += meson-irblaster.o
> obj-$(CONFIG_IR_NUVOTON) += nuvoton-cir.o
> obj-$(CONFIG_IR_ENE) += ene_ir.o
> obj-$(CONFIG_IR_REDRAT3) += redrat3.o
> diff --git a/drivers/media/rc/meson-irblaster.c b/drivers/media/rc/meson-irblaster.c
> new file mode 100644
> index 000000000000..758d9abf252e
> --- /dev/null
> +++ b/drivers/media/rc/meson-irblaster.c
> @@ -0,0 +1,400 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/**
> + * meson-irblaster.c - Amlogic Meson IR blaster driver
> + *
> + * Copyright (c) 2021, SberDevices. All Rights Reserved.
> + *
> + * Author: Viktor Prutyanov <viktor.prutyanov@phystech.edu>
> + */
> +
> +#include <linux/device.h>
> +#include <linux/module.h>
> +#include <linux/sched.h>
> +#include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/interrupt.h>
> +#include <linux/spinlock.h>
> +#include <linux/of_irq.h>
> +#include <linux/clk.h>
> +#include <linux/slab.h>
> +#include <media/rc-core.h>
> +
> +#define DEVICE_NAME "Meson IR blaster"
> +#define DRIVER_NAME "meson-irblaster"
This driver uses the term "blaster" rather "transmitter" or "tx". Is
there a good reason for this? None of the other IR transmitters use the
term blaster; the rc core kapi also only talks about tx.
"IR Blaster" seems like a marketing term for what is essentially a led
switching on and off.
> +
> +#define IRB_MOD_1US_CLK_RATE 1000000
> +
> +#define IRB_DEFAULT_CARRIER 38000
> +#define IRB_DEFAULT_DUTY_CYCLE 50
> +
> +#define IRB_FIFO_LEN 128
> +#define IRB_DEFAULT_MAX_FIFO_LEVEL 96
> +
> +#define IRB_ADDR0 0x0
> +#define IRB_ADDR1 0x4
> +#define IRB_ADDR2 0x8
> +#define IRB_ADDR3 0xc
> +
> +#define IRB_MAX_DELAY (1 << 10)
> +#define IRB_DELAY_MASK (IRB_MAX_DELAY - 1)
> +
> +/* IRCTRL_IR_BLASTER_ADDR0 */
> +#define IRB_MOD_CLK(x) ((x) << 12)
> +#define IRB_MOD_SYS_CLK 0
> +#define IRB_MOD_XTAL3_CLK 1
> +#define IRB_MOD_1US_CLK 2
> +#define IRB_MOD_10US_CLK 3
> +#define IRB_INIT_HIGH BIT(2)
> +#define IRB_ENABLE BIT(0)
> +
> +/* IRCTRL_IR_BLASTER_ADDR2 */
> +#define IRB_MOD_COUNT(lo, hi) ((((lo) - 1) << 16) | ((hi) - 1))
> +
> +/* IRCTRL_IR_BLASTER_ADDR2 */
> +#define IRB_WRITE_FIFO BIT(16)
> +#define IRB_MOD_ENABLE BIT(12)
> +#define IRB_TB_1US (0x0 << 10)
> +#define IRB_TB_10US (0x1 << 10)
> +#define IRB_TB_100US (0x2 << 10)
> +#define IRB_TB_MOD_CLK (0x3 << 10)
> +
> +/* IRCTRL_IR_BLASTER_ADDR3 */
> +#define IRB_FIFO_THD_PENDING BIT(16)
> +#define IRB_FIFO_IRQ_ENABLE BIT(8)
> +
> +struct irblaster_dev {
> + struct device *dev;
> + void __iomem *reg_base;
> + u32 *buf;
> + unsigned int buf_len;
> + unsigned int buf_head;
> + unsigned int carrier;
> + unsigned int duty_cycle;
> + spinlock_t lock;
> + struct completion completion;
> + unsigned int max_fifo_level;
> + unsigned long clk_rate;
> +};
> +
> +static void irb_set_mod(struct irblaster_dev *irb)
> +{
> + unsigned int cnt = DIV_ROUND_CLOSEST(irb->clk_rate, irb->carrier);
> + unsigned int pulse_cnt = DIV_ROUND_CLOSEST(cnt * irb->duty_cycle, 100);
> + unsigned int space_cnt = cnt - pulse_cnt;
> +
> + dev_dbg(irb->dev, "F_mod = %uHz, T_mod = %luns, duty_cycle = %u%%\n",
> + irb->carrier, NSEC_PER_SEC / irb->clk_rate * cnt,
> + 100 * pulse_cnt / cnt);
> +
> + writel(IRB_MOD_COUNT(pulse_cnt, space_cnt),
> + irb->reg_base + IRB_ADDR1);
> +}
> +
> +static void irb_setup(struct irblaster_dev *irb, unsigned int clk_nr)
> +{
> + unsigned int fifo_irq_threshold = IRB_FIFO_LEN - irb->max_fifo_level;
> +
> + /*
> + * Disable the blaster, set modulator clock tick and set initialize
> + * output to be high. Set up carrier frequency and duty cycle. Then
> + * unset initialize output. Enable FIFO interrupt, set FIFO interrupt
> + * threshold. Finally, enable the blaster back.
> + */
> + writel(~IRB_ENABLE & (IRB_MOD_CLK(clk_nr) | IRB_INIT_HIGH),
> + irb->reg_base + IRB_ADDR0);
> + irb_set_mod(irb);
> + writel(readl(irb->reg_base + IRB_ADDR0) & ~IRB_INIT_HIGH,
> + irb->reg_base + IRB_ADDR0);
> + writel(IRB_FIFO_IRQ_ENABLE | fifo_irq_threshold,
> + irb->reg_base + IRB_ADDR3);
> + writel(readl(irb->reg_base + IRB_ADDR0) | IRB_ENABLE,
> + irb->reg_base + IRB_ADDR0);
> +}
> +
> +static u32 irb_prepare_pulse(struct irblaster_dev *irb, unsigned int time)
> +{
> + unsigned int delay;
> + unsigned int tb = IRB_TB_MOD_CLK;
> + unsigned int tb_us = DIV_ROUND_CLOSEST(USEC_PER_SEC, irb->carrier);
> +
> + delay = (DIV_ROUND_CLOSEST(time, tb_us) - 1) & IRB_DELAY_MASK;
> +
> + return ((IRB_WRITE_FIFO | IRB_MOD_ENABLE) | tb | delay);
> +}
> +
> +static u32 irb_prepare_space(struct irblaster_dev *irb, unsigned int time)
> +{
> + unsigned int delay;
> + unsigned int tb = IRB_TB_100US;
> + unsigned int tb_us = 100;
> +
> + if (time <= IRB_MAX_DELAY) {
> + tb = IRB_TB_1US;
> + tb_us = 1;
> + } else if (time <= 10 * IRB_MAX_DELAY) {
> + tb = IRB_TB_10US;
> + tb_us = 10;
> + } else if (time <= 100 * IRB_MAX_DELAY) {
> + tb = IRB_TB_100US;
> + tb_us = 100;
> + }
> +
> + delay = (DIV_ROUND_CLOSEST(time, tb_us) - 1) & IRB_DELAY_MASK;
> +
> + return ((IRB_WRITE_FIFO & ~IRB_MOD_ENABLE) | tb | delay);
> +}
> +
> +static void irb_send_buffer(struct irblaster_dev *irb)
> +{
> + unsigned int nr = 0;
> +
> + while (irb->buf_head < irb->buf_len && nr < irb->max_fifo_level) {
> + writel(irb->buf[irb->buf_head], irb->reg_base + IRB_ADDR2);
> +
> + irb->buf_head++;
> + nr++;
> + }
> +}
> +
> +static bool irb_check_buf(struct irblaster_dev *irb,
> + unsigned int *buf, unsigned int len)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < len; i++) {
> + unsigned int max_tb_us;
> + /*
> + * Max space timebase is 100 us.
> + * Pulse timebase equals to carrier period.
> + */
> + if (i % 2 == 0)
> + max_tb_us = USEC_PER_SEC / irb->carrier;
> + else
> + max_tb_us = 100;
> +
> + if (buf[i] >= max_tb_us * IRB_MAX_DELAY)
> + return false;
> + }
> +
> + return true;
> +}
> +
> +static void irb_fill_buf(struct irblaster_dev *irb, unsigned int *buf)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < irb->buf_len; i++) {
> + if (i % 2 == 0)
> + irb->buf[i] = irb_prepare_pulse(irb, buf[i]);
> + else
> + irb->buf[i] = irb_prepare_space(irb, buf[i]);
> + }
> +}
> +
> +static irqreturn_t irb_irqhandler(int irq, void *data)
> +{
> + unsigned long flags;
> + struct irblaster_dev *irb = data;
> +
> + writel(readl(irb->reg_base + IRB_ADDR3) & ~IRB_FIFO_THD_PENDING,
> + irb->reg_base + IRB_ADDR3);
> +
> + spin_lock_irqsave(&irb->lock, flags);
> + if (irb->buf_head < irb->buf_len)
> + irb_send_buffer(irb);
> + else
> + complete(&irb->completion);
> + spin_unlock_irqrestore(&irb->lock, flags);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int irb_set_tx_carrier(struct rc_dev *rc, u32 carrier)
> +{
> + struct irblaster_dev *irb = rc->priv;
> +
> + if (carrier == 0)
> + return -EINVAL;
> +
> + irb->carrier = carrier;
> + irb_set_mod(irb);
> +
> + return 0;
> +}
> +
> +static int irb_set_tx_duty_cycle(struct rc_dev *rc, u32 duty_cycle)
> +{
> + struct irblaster_dev *irb = rc->priv;
> +
> + irb->duty_cycle = duty_cycle;
> + irb_set_mod(irb);
> +
> + return 0;
> +}
> +
> +static int irb_tx_ir(struct rc_dev *rc, unsigned int *buf, unsigned int len)
> +{
> + unsigned long flags;
> + struct irblaster_dev *irb = rc->priv;
> +
> + if (!irb_check_buf(irb, buf, len))
> + return -EINVAL;
> +
> + irb->buf = kmalloc_array(len, sizeof(u32), GFP_KERNEL);
Right now the interrupt handler could still called, if the previous tx
was interrupted early with a signal. This should also be in spinlock
so we make sure we are not sending garbage.
> + if (!irb->buf)
> + return -ENOMEM;
> +
> + irb->buf_len = len;
> + irb->buf_head = 0;
> + irb_fill_buf(irb, buf);
> +
> + reinit_completion(&irb->completion);
> +
> + dev_dbg(irb->dev, "tx started, buffer length = %u\n", irb->buf_len);
> + spin_lock_irqsave(&irb->lock, flags);
> + irb_send_buffer(irb);
> + spin_unlock_irqrestore(&irb->lock, flags);
> + wait_for_completion_interruptible(&irb->completion);
> + dev_dbg(irb->dev, "tx completed\n");
Here the debug talks about tx, not blasting.
> +
> + spin_lock_irqsave(&irb->lock, flags);
> + kfree(irb->buf);
> + irb->buf = NULL;
> + irb->buf_len = 0;
> + spin_unlock_irqrestore(&irb->lock, flags);
> +
> + return len;
> +}
> +
> +static int irb_mod_clock_probe(struct irblaster_dev *irb, unsigned int *clk_nr)
> +{
> + struct device_node *np = irb->dev->of_node;
> + struct clk *clock;
> +
> + if (!np)
> + return -ENODEV;
> +
> + clock = devm_clk_get(irb->dev, "xtal");
> + if (IS_ERR(clock) || clk_prepare_enable(clock))
> + return -ENODEV;
> +
> + *clk_nr = IRB_MOD_XTAL3_CLK;
> + irb->clk_rate = clk_get_rate(clock) / 3;
> +
> + if (irb->clk_rate < IRB_MOD_1US_CLK_RATE) {
> + *clk_nr = IRB_MOD_1US_CLK;
> + irb->clk_rate = IRB_MOD_1US_CLK_RATE;
> + }
> +
> + dev_info(irb->dev, "F_clk = %luHz\n", irb->clk_rate);
> +
> + return 0;
> +}
> +
> +static int __init irblaster_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct irblaster_dev *irb;
> + struct rc_dev *rc;
> + int irq;
> + unsigned int clk_nr;
> + int ret;
> +
> + irb = devm_kzalloc(dev, sizeof(*irb), GFP_KERNEL);
> + if (!irb)
> + return -ENOMEM;
> +
> + irb->reg_base = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(irb->reg_base))
> + return PTR_ERR(irb->reg_base);
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0) {
> + dev_err(dev, "no irq resource found\n");
> + return -ENODEV;
> + }
> +
> + if (of_property_read_u32(dev->of_node, "max-fifo-level",
> + &irb->max_fifo_level))
> + irb->max_fifo_level = IRB_DEFAULT_MAX_FIFO_LEVEL;
> + else if (irb->max_fifo_level > IRB_FIFO_LEN)
> + irb->max_fifo_level = IRB_DEFAULT_MAX_FIFO_LEVEL;
> + dev_dbg(dev, "max FIFO level set to %u\n", irb->max_fifo_level);
> +
> + irb->dev = dev;
> + irb->carrier = IRB_DEFAULT_CARRIER;
> + irb->duty_cycle = IRB_DEFAULT_DUTY_CYCLE;
> + init_completion(&irb->completion);
> + spin_lock_init(&irb->lock);
> +
> + ret = irb_mod_clock_probe(irb, &clk_nr);
> + if (ret) {
> + dev_err(dev, "modulator clock setup failed\n");
> + return ret;
> + }
> + irb_setup(irb, clk_nr);
> +
> + ret = devm_request_irq(dev, irq,
> + irb_irqhandler,
> + IRQF_TRIGGER_RISING,
> + DRIVER_NAME, irb);
> + if (ret) {
> + dev_err(dev, "irq request failed\n");
> + return ret;
> + }
> +
> + rc = rc_allocate_device(RC_DRIVER_IR_RAW_TX);
> + if (!rc)
> + return -ENOMEM;
> +
> + rc->driver_name = DRIVER_NAME;
> + rc->device_name = DEVICE_NAME;
> + rc->priv = irb;
> +
> + rc->tx_ir = irb_tx_ir;
> + rc->s_tx_carrier = irb_set_tx_carrier;
> + rc->s_tx_duty_cycle = irb_set_tx_duty_cycle;
> +
> + ret = rc_register_device(rc);
> + if (ret < 0) {
> + dev_err(dev, "rc_dev registration failed\n");
> + rc_free_device(rc);
> + return ret;
> + }
> +
> + platform_set_drvdata(pdev, rc);
> +
> + return 0;
> +}
> +
> +static int irblaster_remove(struct platform_device *pdev)
> +{
> + struct rc_dev *rc = platform_get_drvdata(pdev);
> +
> + rc_unregister_device(rc);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id irblaster_dt_match[] = {
> + {
> + .compatible = "amlogic,meson-g12a-irblaster",
> + },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, irblaster_dt_match);
> +
> +static struct platform_driver irblaster_pd = {
> + .remove = irblaster_remove,
> + .driver = {
> + .name = DRIVER_NAME,
> + .owner = THIS_MODULE,
> + .of_match_table = irblaster_dt_match,
> + },
> +};
> +
> +module_platform_driver_probe(irblaster_pd, irblaster_probe);
> +
> +MODULE_DESCRIPTION("Meson IR blaster driver");
> +MODULE_AUTHOR("Viktor Prutyanov <viktor.prutyanov@phystech.edu>");
> +MODULE_LICENSE("GPL");
> --
> 2.21.0
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^ permalink raw reply [flat|nested] 17+ messages in thread* Re: [PATCH v3 2/2] media: rc: introduce Meson IR blaster driver
@ 2021-07-09 22:11 ` Sean Young
0 siblings, 0 replies; 17+ messages in thread
From: Sean Young @ 2021-07-09 22:11 UTC (permalink / raw)
To: Viktor Prutyanov
Cc: mchehab, robh+dt, khilman, narmstrong, jbrunet,
martin.blumenstingl, linux-media, devicetree, linux-kernel,
linux-arm-kernel, linux-amlogic, rockosov
Hi Viktor,
The driver look great! Thanks for making those changes. Just two minor
comments.
On Fri, Jul 09, 2021 at 07:57:53PM +0300, Viktor Prutyanov wrote:
> This patch adds the driver for Amlogic Meson IR blaster.
>
> Some Amlogic SoCs such as A311D and T950D4 have IR transmitter
> (blaster) controller onboard. It is capable of sending IR
> signals with arbitrary carrier frequency and duty cycle.
>
> The driver supports 3 modulation clock sources:
> - sysclk
> - xtal3 clock (xtal divided by 3)
> - 1us clock
>
> Signed-off-by: Viktor Prutyanov <viktor.prutyanov@phystech.edu>
> ---
> changes in v2:
> - threaded IRQ removed, all stuff done in IRQ handler
> - DIV_ROUND_CLOSEST_ULL replaced with DIV_ROUND_CLOSEST
> - compatible changed to "amlogic,meson-g12a-irblaster"
> - 'debug' parameter removed
> - dprintk() replaced with dev_dbg()/dev_info()
> - carrier frequency checked against 0
> - device_name added
> changes in v3:
> - license header fixed
> - 'max_fifo_level' parameter removed
> - irq and clk_nr deleted from irblaster_dev struct
> - some divisions replaced with DIV_ROUND_CLOSEST
> - irb_send inlined
> - fixed early completion in IRQ handler
> - spin lock added before kfree
>
> drivers/media/rc/Kconfig | 10 +
> drivers/media/rc/Makefile | 1 +
> drivers/media/rc/meson-irblaster.c | 400 +++++++++++++++++++++++++++++
> 3 files changed, 411 insertions(+)
> create mode 100644 drivers/media/rc/meson-irblaster.c
>
> diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
> index d0a8326b75c2..6e60348e1bcf 100644
> --- a/drivers/media/rc/Kconfig
> +++ b/drivers/media/rc/Kconfig
> @@ -246,6 +246,16 @@ config IR_MESON
> To compile this driver as a module, choose M here: the
> module will be called meson-ir.
>
> +config IR_MESON_IRBLASTER
> + tristate "Amlogic Meson IR blaster"
> + depends on ARCH_MESON || COMPILE_TEST
> + help
> + Say Y if you want to use the IR blaster available on
> + Amlogic Meson SoCs.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called meson-irblaster.
> +
> config IR_MTK
> tristate "Mediatek IR remote receiver"
> depends on ARCH_MEDIATEK || COMPILE_TEST
> diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile
> index 692e9b6b203f..b108f2b0420c 100644
> --- a/drivers/media/rc/Makefile
> +++ b/drivers/media/rc/Makefile
> @@ -28,6 +28,7 @@ obj-$(CONFIG_IR_ITE_CIR) += ite-cir.o
> obj-$(CONFIG_IR_MCEUSB) += mceusb.o
> obj-$(CONFIG_IR_FINTEK) += fintek-cir.o
> obj-$(CONFIG_IR_MESON) += meson-ir.o
> +obj-$(CONFIG_IR_MESON_IRBLASTER) += meson-irblaster.o
> obj-$(CONFIG_IR_NUVOTON) += nuvoton-cir.o
> obj-$(CONFIG_IR_ENE) += ene_ir.o
> obj-$(CONFIG_IR_REDRAT3) += redrat3.o
> diff --git a/drivers/media/rc/meson-irblaster.c b/drivers/media/rc/meson-irblaster.c
> new file mode 100644
> index 000000000000..758d9abf252e
> --- /dev/null
> +++ b/drivers/media/rc/meson-irblaster.c
> @@ -0,0 +1,400 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/**
> + * meson-irblaster.c - Amlogic Meson IR blaster driver
> + *
> + * Copyright (c) 2021, SberDevices. All Rights Reserved.
> + *
> + * Author: Viktor Prutyanov <viktor.prutyanov@phystech.edu>
> + */
> +
> +#include <linux/device.h>
> +#include <linux/module.h>
> +#include <linux/sched.h>
> +#include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/interrupt.h>
> +#include <linux/spinlock.h>
> +#include <linux/of_irq.h>
> +#include <linux/clk.h>
> +#include <linux/slab.h>
> +#include <media/rc-core.h>
> +
> +#define DEVICE_NAME "Meson IR blaster"
> +#define DRIVER_NAME "meson-irblaster"
This driver uses the term "blaster" rather "transmitter" or "tx". Is
there a good reason for this? None of the other IR transmitters use the
term blaster; the rc core kapi also only talks about tx.
"IR Blaster" seems like a marketing term for what is essentially a led
switching on and off.
> +
> +#define IRB_MOD_1US_CLK_RATE 1000000
> +
> +#define IRB_DEFAULT_CARRIER 38000
> +#define IRB_DEFAULT_DUTY_CYCLE 50
> +
> +#define IRB_FIFO_LEN 128
> +#define IRB_DEFAULT_MAX_FIFO_LEVEL 96
> +
> +#define IRB_ADDR0 0x0
> +#define IRB_ADDR1 0x4
> +#define IRB_ADDR2 0x8
> +#define IRB_ADDR3 0xc
> +
> +#define IRB_MAX_DELAY (1 << 10)
> +#define IRB_DELAY_MASK (IRB_MAX_DELAY - 1)
> +
> +/* IRCTRL_IR_BLASTER_ADDR0 */
> +#define IRB_MOD_CLK(x) ((x) << 12)
> +#define IRB_MOD_SYS_CLK 0
> +#define IRB_MOD_XTAL3_CLK 1
> +#define IRB_MOD_1US_CLK 2
> +#define IRB_MOD_10US_CLK 3
> +#define IRB_INIT_HIGH BIT(2)
> +#define IRB_ENABLE BIT(0)
> +
> +/* IRCTRL_IR_BLASTER_ADDR2 */
> +#define IRB_MOD_COUNT(lo, hi) ((((lo) - 1) << 16) | ((hi) - 1))
> +
> +/* IRCTRL_IR_BLASTER_ADDR2 */
> +#define IRB_WRITE_FIFO BIT(16)
> +#define IRB_MOD_ENABLE BIT(12)
> +#define IRB_TB_1US (0x0 << 10)
> +#define IRB_TB_10US (0x1 << 10)
> +#define IRB_TB_100US (0x2 << 10)
> +#define IRB_TB_MOD_CLK (0x3 << 10)
> +
> +/* IRCTRL_IR_BLASTER_ADDR3 */
> +#define IRB_FIFO_THD_PENDING BIT(16)
> +#define IRB_FIFO_IRQ_ENABLE BIT(8)
> +
> +struct irblaster_dev {
> + struct device *dev;
> + void __iomem *reg_base;
> + u32 *buf;
> + unsigned int buf_len;
> + unsigned int buf_head;
> + unsigned int carrier;
> + unsigned int duty_cycle;
> + spinlock_t lock;
> + struct completion completion;
> + unsigned int max_fifo_level;
> + unsigned long clk_rate;
> +};
> +
> +static void irb_set_mod(struct irblaster_dev *irb)
> +{
> + unsigned int cnt = DIV_ROUND_CLOSEST(irb->clk_rate, irb->carrier);
> + unsigned int pulse_cnt = DIV_ROUND_CLOSEST(cnt * irb->duty_cycle, 100);
> + unsigned int space_cnt = cnt - pulse_cnt;
> +
> + dev_dbg(irb->dev, "F_mod = %uHz, T_mod = %luns, duty_cycle = %u%%\n",
> + irb->carrier, NSEC_PER_SEC / irb->clk_rate * cnt,
> + 100 * pulse_cnt / cnt);
> +
> + writel(IRB_MOD_COUNT(pulse_cnt, space_cnt),
> + irb->reg_base + IRB_ADDR1);
> +}
> +
> +static void irb_setup(struct irblaster_dev *irb, unsigned int clk_nr)
> +{
> + unsigned int fifo_irq_threshold = IRB_FIFO_LEN - irb->max_fifo_level;
> +
> + /*
> + * Disable the blaster, set modulator clock tick and set initialize
> + * output to be high. Set up carrier frequency and duty cycle. Then
> + * unset initialize output. Enable FIFO interrupt, set FIFO interrupt
> + * threshold. Finally, enable the blaster back.
> + */
> + writel(~IRB_ENABLE & (IRB_MOD_CLK(clk_nr) | IRB_INIT_HIGH),
> + irb->reg_base + IRB_ADDR0);
> + irb_set_mod(irb);
> + writel(readl(irb->reg_base + IRB_ADDR0) & ~IRB_INIT_HIGH,
> + irb->reg_base + IRB_ADDR0);
> + writel(IRB_FIFO_IRQ_ENABLE | fifo_irq_threshold,
> + irb->reg_base + IRB_ADDR3);
> + writel(readl(irb->reg_base + IRB_ADDR0) | IRB_ENABLE,
> + irb->reg_base + IRB_ADDR0);
> +}
> +
> +static u32 irb_prepare_pulse(struct irblaster_dev *irb, unsigned int time)
> +{
> + unsigned int delay;
> + unsigned int tb = IRB_TB_MOD_CLK;
> + unsigned int tb_us = DIV_ROUND_CLOSEST(USEC_PER_SEC, irb->carrier);
> +
> + delay = (DIV_ROUND_CLOSEST(time, tb_us) - 1) & IRB_DELAY_MASK;
> +
> + return ((IRB_WRITE_FIFO | IRB_MOD_ENABLE) | tb | delay);
> +}
> +
> +static u32 irb_prepare_space(struct irblaster_dev *irb, unsigned int time)
> +{
> + unsigned int delay;
> + unsigned int tb = IRB_TB_100US;
> + unsigned int tb_us = 100;
> +
> + if (time <= IRB_MAX_DELAY) {
> + tb = IRB_TB_1US;
> + tb_us = 1;
> + } else if (time <= 10 * IRB_MAX_DELAY) {
> + tb = IRB_TB_10US;
> + tb_us = 10;
> + } else if (time <= 100 * IRB_MAX_DELAY) {
> + tb = IRB_TB_100US;
> + tb_us = 100;
> + }
> +
> + delay = (DIV_ROUND_CLOSEST(time, tb_us) - 1) & IRB_DELAY_MASK;
> +
> + return ((IRB_WRITE_FIFO & ~IRB_MOD_ENABLE) | tb | delay);
> +}
> +
> +static void irb_send_buffer(struct irblaster_dev *irb)
> +{
> + unsigned int nr = 0;
> +
> + while (irb->buf_head < irb->buf_len && nr < irb->max_fifo_level) {
> + writel(irb->buf[irb->buf_head], irb->reg_base + IRB_ADDR2);
> +
> + irb->buf_head++;
> + nr++;
> + }
> +}
> +
> +static bool irb_check_buf(struct irblaster_dev *irb,
> + unsigned int *buf, unsigned int len)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < len; i++) {
> + unsigned int max_tb_us;
> + /*
> + * Max space timebase is 100 us.
> + * Pulse timebase equals to carrier period.
> + */
> + if (i % 2 == 0)
> + max_tb_us = USEC_PER_SEC / irb->carrier;
> + else
> + max_tb_us = 100;
> +
> + if (buf[i] >= max_tb_us * IRB_MAX_DELAY)
> + return false;
> + }
> +
> + return true;
> +}
> +
> +static void irb_fill_buf(struct irblaster_dev *irb, unsigned int *buf)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < irb->buf_len; i++) {
> + if (i % 2 == 0)
> + irb->buf[i] = irb_prepare_pulse(irb, buf[i]);
> + else
> + irb->buf[i] = irb_prepare_space(irb, buf[i]);
> + }
> +}
> +
> +static irqreturn_t irb_irqhandler(int irq, void *data)
> +{
> + unsigned long flags;
> + struct irblaster_dev *irb = data;
> +
> + writel(readl(irb->reg_base + IRB_ADDR3) & ~IRB_FIFO_THD_PENDING,
> + irb->reg_base + IRB_ADDR3);
> +
> + spin_lock_irqsave(&irb->lock, flags);
> + if (irb->buf_head < irb->buf_len)
> + irb_send_buffer(irb);
> + else
> + complete(&irb->completion);
> + spin_unlock_irqrestore(&irb->lock, flags);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int irb_set_tx_carrier(struct rc_dev *rc, u32 carrier)
> +{
> + struct irblaster_dev *irb = rc->priv;
> +
> + if (carrier == 0)
> + return -EINVAL;
> +
> + irb->carrier = carrier;
> + irb_set_mod(irb);
> +
> + return 0;
> +}
> +
> +static int irb_set_tx_duty_cycle(struct rc_dev *rc, u32 duty_cycle)
> +{
> + struct irblaster_dev *irb = rc->priv;
> +
> + irb->duty_cycle = duty_cycle;
> + irb_set_mod(irb);
> +
> + return 0;
> +}
> +
> +static int irb_tx_ir(struct rc_dev *rc, unsigned int *buf, unsigned int len)
> +{
> + unsigned long flags;
> + struct irblaster_dev *irb = rc->priv;
> +
> + if (!irb_check_buf(irb, buf, len))
> + return -EINVAL;
> +
> + irb->buf = kmalloc_array(len, sizeof(u32), GFP_KERNEL);
Right now the interrupt handler could still called, if the previous tx
was interrupted early with a signal. This should also be in spinlock
so we make sure we are not sending garbage.
> + if (!irb->buf)
> + return -ENOMEM;
> +
> + irb->buf_len = len;
> + irb->buf_head = 0;
> + irb_fill_buf(irb, buf);
> +
> + reinit_completion(&irb->completion);
> +
> + dev_dbg(irb->dev, "tx started, buffer length = %u\n", irb->buf_len);
> + spin_lock_irqsave(&irb->lock, flags);
> + irb_send_buffer(irb);
> + spin_unlock_irqrestore(&irb->lock, flags);
> + wait_for_completion_interruptible(&irb->completion);
> + dev_dbg(irb->dev, "tx completed\n");
Here the debug talks about tx, not blasting.
> +
> + spin_lock_irqsave(&irb->lock, flags);
> + kfree(irb->buf);
> + irb->buf = NULL;
> + irb->buf_len = 0;
> + spin_unlock_irqrestore(&irb->lock, flags);
> +
> + return len;
> +}
> +
> +static int irb_mod_clock_probe(struct irblaster_dev *irb, unsigned int *clk_nr)
> +{
> + struct device_node *np = irb->dev->of_node;
> + struct clk *clock;
> +
> + if (!np)
> + return -ENODEV;
> +
> + clock = devm_clk_get(irb->dev, "xtal");
> + if (IS_ERR(clock) || clk_prepare_enable(clock))
> + return -ENODEV;
> +
> + *clk_nr = IRB_MOD_XTAL3_CLK;
> + irb->clk_rate = clk_get_rate(clock) / 3;
> +
> + if (irb->clk_rate < IRB_MOD_1US_CLK_RATE) {
> + *clk_nr = IRB_MOD_1US_CLK;
> + irb->clk_rate = IRB_MOD_1US_CLK_RATE;
> + }
> +
> + dev_info(irb->dev, "F_clk = %luHz\n", irb->clk_rate);
> +
> + return 0;
> +}
> +
> +static int __init irblaster_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct irblaster_dev *irb;
> + struct rc_dev *rc;
> + int irq;
> + unsigned int clk_nr;
> + int ret;
> +
> + irb = devm_kzalloc(dev, sizeof(*irb), GFP_KERNEL);
> + if (!irb)
> + return -ENOMEM;
> +
> + irb->reg_base = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(irb->reg_base))
> + return PTR_ERR(irb->reg_base);
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0) {
> + dev_err(dev, "no irq resource found\n");
> + return -ENODEV;
> + }
> +
> + if (of_property_read_u32(dev->of_node, "max-fifo-level",
> + &irb->max_fifo_level))
> + irb->max_fifo_level = IRB_DEFAULT_MAX_FIFO_LEVEL;
> + else if (irb->max_fifo_level > IRB_FIFO_LEN)
> + irb->max_fifo_level = IRB_DEFAULT_MAX_FIFO_LEVEL;
> + dev_dbg(dev, "max FIFO level set to %u\n", irb->max_fifo_level);
> +
> + irb->dev = dev;
> + irb->carrier = IRB_DEFAULT_CARRIER;
> + irb->duty_cycle = IRB_DEFAULT_DUTY_CYCLE;
> + init_completion(&irb->completion);
> + spin_lock_init(&irb->lock);
> +
> + ret = irb_mod_clock_probe(irb, &clk_nr);
> + if (ret) {
> + dev_err(dev, "modulator clock setup failed\n");
> + return ret;
> + }
> + irb_setup(irb, clk_nr);
> +
> + ret = devm_request_irq(dev, irq,
> + irb_irqhandler,
> + IRQF_TRIGGER_RISING,
> + DRIVER_NAME, irb);
> + if (ret) {
> + dev_err(dev, "irq request failed\n");
> + return ret;
> + }
> +
> + rc = rc_allocate_device(RC_DRIVER_IR_RAW_TX);
> + if (!rc)
> + return -ENOMEM;
> +
> + rc->driver_name = DRIVER_NAME;
> + rc->device_name = DEVICE_NAME;
> + rc->priv = irb;
> +
> + rc->tx_ir = irb_tx_ir;
> + rc->s_tx_carrier = irb_set_tx_carrier;
> + rc->s_tx_duty_cycle = irb_set_tx_duty_cycle;
> +
> + ret = rc_register_device(rc);
> + if (ret < 0) {
> + dev_err(dev, "rc_dev registration failed\n");
> + rc_free_device(rc);
> + return ret;
> + }
> +
> + platform_set_drvdata(pdev, rc);
> +
> + return 0;
> +}
> +
> +static int irblaster_remove(struct platform_device *pdev)
> +{
> + struct rc_dev *rc = platform_get_drvdata(pdev);
> +
> + rc_unregister_device(rc);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id irblaster_dt_match[] = {
> + {
> + .compatible = "amlogic,meson-g12a-irblaster",
> + },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, irblaster_dt_match);
> +
> +static struct platform_driver irblaster_pd = {
> + .remove = irblaster_remove,
> + .driver = {
> + .name = DRIVER_NAME,
> + .owner = THIS_MODULE,
> + .of_match_table = irblaster_dt_match,
> + },
> +};
> +
> +module_platform_driver_probe(irblaster_pd, irblaster_probe);
> +
> +MODULE_DESCRIPTION("Meson IR blaster driver");
> +MODULE_AUTHOR("Viktor Prutyanov <viktor.prutyanov@phystech.edu>");
> +MODULE_LICENSE("GPL");
> --
> 2.21.0
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