573 lines
14 KiB
C
573 lines
14 KiB
C
/*
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* drivers/media/rc/sunxi-gpio-ir.c
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*
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* Copyright (c) 2013-2018 Allwinnertech Co., Ltd.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/gpio.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/platform_device.h>
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#include <linux/irq.h>
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#include <media/rc-core.h>
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#include <linux/platform_data/media/sunxi-gpio-ir.h>
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#include <linux/pwm.h>
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#include <linux/sunxi-gpio.h>
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#include <linux/time.h>
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#include <linux/hrtimer.h>
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#include <linux/uaccess.h>
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#include <linux/completion.h>
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#define GPIO_IR_DRIVER_NAME "sunxi-gpio-rc"
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#define GPIO_IR_DEVICE_NAME "sunxi_gpio_ir"
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#define GPIO_IR_TIMEOUT MS_TO_NS(12)
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#define GPIO_IR_CARRIER_FREQ 38000 /*38K*/
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#define GPIO_IR_DUTY_CYCLE 33 /*33.33%*/
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#define GPIO_IR_PERIOD (int)(1000000000UL/GPIO_IR_CARRIER_FREQ)
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#define TX_BUFF_LEN 512
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struct gpio_rc_dev {
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struct rc_dev *rcdev;
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struct pwm_device *pwm;
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int gpio_rx_nr;
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int gpio_tx_nr;
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bool active_low;
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bool pwm_used;
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int pwm_port;
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int tx_carrier_freq;
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int tx_duty_cycle;
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spinlock_t tx_lock;
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spinlock_t carr_lock;
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struct mutex pwm_lock;
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struct timer_list flush_timer;
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struct hrtimer tx_hrtimer;
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struct completion tx_completion;
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unsigned int tx_raw_buf[512];
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int raw_count;
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int tx_index;
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};
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static void ir_send_carrier(struct gpio_rc_dev *gpio_dev, int time_us)
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{
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int i;
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unsigned long flags;
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unsigned long period_ns, on_ns, off_ns;
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unsigned long carrier_freq, carrier_num;
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unsigned long duty_cycle;
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carrier_freq = gpio_dev->tx_carrier_freq;
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duty_cycle = gpio_dev->tx_duty_cycle;
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period_ns = 1000000000UL / carrier_freq;
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on_ns = period_ns * duty_cycle / 100;
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off_ns = period_ns * (100 - duty_cycle) / 100;
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carrier_num = US_TO_NS(time_us) / period_ns;
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spin_lock_irqsave(&gpio_dev->carr_lock, flags);
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for (i = 0; i < carrier_num; i++) {
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gpio_set_value(gpio_dev->gpio_tx_nr, 1);
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ndelay(on_ns);
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gpio_set_value(gpio_dev->gpio_tx_nr, 0);
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ndelay(off_ns);
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}
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gpio_set_value(gpio_dev->gpio_tx_nr, 0);
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spin_unlock_irqrestore(&gpio_dev->carr_lock, flags);
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}
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#ifdef CONFIG_OF
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/*
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* Translate OpenFirmware node properties into platform_data
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*/
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static int gpio_ir_get_devtree_pdata(struct device *dev,
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struct gpio_ir_platform_data *pdata)
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{
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struct device_node *np = dev->of_node;
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struct gpio_config config;
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u32 rx_protos_type[24];
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int num_type;
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int gpio;
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int pwm;
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int ret, i;
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/* probe() takes care of map_name == NULL or allowed_protos == 0 */
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pdata->map_name = of_get_property(np, "linux,rc-map-name", NULL);
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dev_dbg(dev, "rc-map-name: (%s)\n", pdata->map_name);
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num_type = of_property_count_u32_elems(np, "linux,ir-rx-protos");
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if (num_type > sizeof(rx_protos_type))
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num_type = sizeof(rx_protos_type);
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ret = of_property_read_u32_array(np, "linux,ir-rx-protos",
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rx_protos_type,
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num_type);
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if (ret) {
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dev_err(dev,
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"failed to read linux,ir-protos-type: %d\n", ret);
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pdata->allowed_protos = 0;
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return ret;
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}
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for (i = 0; i < num_type; i++)
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pdata->allowed_protos |= 1 << rx_protos_type[i];
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dev_dbg(dev, "allowed_protos: (0x%x)\n", (u32)pdata->allowed_protos);
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pdata->tx_capable = of_property_read_bool(np, "linux,tx-enable");
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pdata->pwm_tx_used = of_property_read_bool(np, "linux,tx-pwm-mode");
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if (pdata->pwm_tx_used) {
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ret = of_property_read_u32(np, "linux,pwm-port", &pwm);
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if (ret) {
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dev_err(dev,
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"failed to read linux,pwm-port: %d\n", ret);
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return ret;
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}
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pdata->pwm_port = pwm;
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dev_dbg(dev, "ir mode: pwm uesd, pwm port: (%d)\n", pwm);
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} else {
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gpio = of_get_named_gpio_flags(dev->of_node,
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"tran-gpio", 0,
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(enum of_gpio_flags *)&config);
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if (gpio < 0) {
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if (gpio != -EPROBE_DEFER)
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dev_err(dev,
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"Failed to get gpio flags (%d)\n", gpio);
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return gpio;
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}
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pdata->gpio_tx_nr = gpio;
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dev_dbg(dev, "gpio tx num: (%d)\n", gpio);
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}
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gpio = of_get_named_gpio_flags(dev->of_node,
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"recv-gpio", 0,
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(enum of_gpio_flags *)&config);
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if (gpio < 0) {
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if (gpio != -EPROBE_DEFER)
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dev_err(dev, "Failed to get gpio flags (%d)\n", gpio);
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return gpio;
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}
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pdata->gpio_rx_nr = gpio;
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dev_dbg(dev, "gpio rx num: (%d)\n", gpio);
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return 0;
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}
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static const struct of_device_id gpio_ir_recv_of_match[] = {
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{ .compatible = "sunxi-gpio-ir", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match);
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#else /* !CONFIG_OF */
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#define gpio_ir_get_devtree_pdata(dev, pdata) (-ENOSYS)
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#endif
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static enum hrtimer_restart tx_hrtimer_hander(struct hrtimer *timer)
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{
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struct gpio_rc_dev *gpio_dev;
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DEFINE_IR_RAW_EVENT(ev);
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unsigned long period_ns, on_ns, off_ns;
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unsigned long carrier_freq;
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unsigned long duty_cycle;
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int j = 0;
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gpio_dev = container_of(timer, struct gpio_rc_dev, tx_hrtimer);
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if (!gpio_dev)
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return HRTIMER_RESTART;
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carrier_freq = gpio_dev->tx_carrier_freq;
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duty_cycle = gpio_dev->tx_duty_cycle;
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period_ns = 1000000000UL / carrier_freq;
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on_ns = period_ns * duty_cycle / 100;
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off_ns = period_ns * (100 - duty_cycle) / 100;
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if (gpio_dev->tx_index >= gpio_dev->raw_count) {
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complete(&gpio_dev->tx_completion);
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return HRTIMER_NORESTART;
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}
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j = gpio_dev->tx_index;
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ev.duration = *(gpio_dev->tx_raw_buf + j) & 0x00FFFFFF;
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/*the high byte is pulse/space flag*/
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ev.pulse = *(gpio_dev->tx_raw_buf + j) & 0xFF000000 ? true : false;
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if (ev.pulse) {
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/*carrier pluse*/
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pwm_config(gpio_dev->pwm, off_ns, period_ns);
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} else {
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pwm_config(gpio_dev->pwm, period_ns, period_ns);
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}
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/*restart next timer*/
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hrtimer_forward_now(&gpio_dev->tx_hrtimer,
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ktime_set(0, ev.duration * 1000));
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gpio_dev->tx_index++;
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return HRTIMER_RESTART;
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}
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static void tx_timer_start(struct rc_dev *rcdev)
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{
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struct gpio_rc_dev *gpio_dev = rcdev->priv;
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hrtimer_init(&gpio_dev->tx_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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gpio_dev->tx_hrtimer.function = tx_hrtimer_hander;
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gpio_dev->tx_index = 0;
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hrtimer_start(&gpio_dev->tx_hrtimer,
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ktime_set(0, 1000*1000),
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HRTIMER_MODE_REL);
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}
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/* outside interface: transmit */
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static int gpio_transmit_ir(struct rc_dev *rcdev, unsigned int *txbuf,
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unsigned int count)
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{
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struct gpio_rc_dev *gpio_dev = rcdev->priv;
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int i = 0;
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unsigned long flags;
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DEFINE_IR_RAW_EVENT(ev);
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dev_dbg(&rcdev->dev, "IR tX: transmit %d raw data\n", count);
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/*gpio tx mode*/
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if (!gpio_dev->pwm_used) {
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spin_lock_irqsave(&gpio_dev->tx_lock, flags);
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for (i = 0; i < count; i++) {
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ev.duration = *(txbuf + i) & 0x00FFFFFF;
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/*the high byte is pulse/space flag*/
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ev.pulse = *(txbuf + i) & 0xFF000000 ? true : false;
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if (ev.pulse)
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/*carrier pluse*/
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ir_send_carrier(gpio_dev, ev.duration);
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else
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udelay(ev.duration);/*ir space*/
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}
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spin_unlock_irqrestore(&gpio_dev->tx_lock, flags);
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} else {
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mutex_lock(&gpio_dev->pwm_lock);
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memcpy(gpio_dev->tx_raw_buf,
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txbuf,
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count * sizeof(unsigned int));
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gpio_dev->raw_count = count;
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/*pwm enable*/
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pwm_config(gpio_dev->pwm, GPIO_IR_PERIOD, GPIO_IR_PERIOD);
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pwm_enable(gpio_dev->pwm);
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tx_timer_start(rcdev);
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/*wait for transmit completed*/
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wait_for_completion(&gpio_dev->tx_completion);
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dev_dbg(&rcdev->dev, "IR tX: pwm transmit one frame\n");
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hrtimer_cancel(&gpio_dev->tx_hrtimer);
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pwm_disable(gpio_dev->pwm);
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mutex_unlock(&gpio_dev->pwm_lock);
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}
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return count;
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}
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/* set the tx carrier freq, guess it's in Hz... */
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static int gpio_set_tx_carrier(struct rc_dev *rcdev, u32 carrier)
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{
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unsigned long flags;
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struct gpio_rc_dev *gpio_dev = rcdev->priv;
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dev_dbg(&rcdev->dev, "GPIO IR: carrier freq: %d\n", carrier);
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spin_lock_irqsave(&gpio_dev->tx_lock, flags);
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gpio_dev->tx_carrier_freq = carrier;
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spin_unlock_irqrestore(&gpio_dev->tx_lock, flags);
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return 0;
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}
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/* set the tx duty cycle by controlling the pulse width */
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static int gpio_set_tx_duty_cycle(struct rc_dev *rcdev, u32 duty_cycle)
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{
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unsigned long flags;
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struct gpio_rc_dev *gpio_dev = rcdev->priv;
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dev_dbg(&rcdev->dev, "GPIO IR: duty cycle: %d\n", duty_cycle);
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spin_lock_irqsave(&gpio_dev->tx_lock, flags);
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gpio_dev->tx_duty_cycle = duty_cycle;
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spin_unlock_irqrestore(&gpio_dev->tx_lock, flags);
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return 0;
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}
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static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
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{
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struct gpio_rc_dev *gpio_dev = dev_id;
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int gval;
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int rc = 0;
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enum raw_event_type type = IR_SPACE;
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gval = gpio_get_value(gpio_dev->gpio_rx_nr);
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if (gval < 0)
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goto err_get_value;
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if (gpio_dev->active_low)
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gval = !gval;
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if (gval == 1)
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type = IR_PULSE;
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rc = ir_raw_event_store_edge(gpio_dev->rcdev, type);
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if (rc < 0)
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goto err_get_value;
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mod_timer(&gpio_dev->flush_timer,
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jiffies + nsecs_to_jiffies(gpio_dev->rcdev->timeout));
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ir_raw_event_handle(gpio_dev->rcdev);
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err_get_value:
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return IRQ_HANDLED;
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}
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static void flush_timer(unsigned long arg)
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{
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struct gpio_rc_dev *gpio_dev = (struct gpio_rc_dev *)arg;
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DEFINE_IR_RAW_EVENT(ev);
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ev.timeout = true;
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ev.duration = gpio_dev->rcdev->timeout;
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ir_raw_event_store(gpio_dev->rcdev, &ev);
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ir_raw_event_handle(gpio_dev->rcdev);
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}
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static int gpio_ir_recv_probe(struct platform_device *pdev)
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{
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struct gpio_rc_dev *gpio_dev;
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struct rc_dev *rcdev;
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struct gpio_ir_platform_data *pdata =
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pdev->dev.platform_data;
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int rc;
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if (pdev->dev.of_node) {
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struct gpio_ir_platform_data *dtpdata =
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devm_kzalloc(&pdev->dev, sizeof(*dtpdata), GFP_KERNEL);
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if (!dtpdata)
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return -ENOMEM;
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rc = gpio_ir_get_devtree_pdata(&pdev->dev, dtpdata);
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if (rc)
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return rc;
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pdata = dtpdata;
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}
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if (!pdata)
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return -EINVAL;
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if (pdata->gpio_rx_nr < 0)
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return -EINVAL;
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gpio_dev = kzalloc(sizeof(struct gpio_rc_dev), GFP_KERNEL);
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if (!gpio_dev)
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return -ENOMEM;
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rcdev = rc_allocate_device();
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if (!rcdev) {
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rc = -ENOMEM;
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goto err_allocate_device;
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}
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rcdev->priv = gpio_dev;
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rcdev->driver_type = RC_DRIVER_IR_RAW;
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rcdev->input_name = GPIO_IR_DEVICE_NAME;
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rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0";
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rcdev->input_id.bustype = BUS_HOST;
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rcdev->input_id.vendor = 0x0001;
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rcdev->input_id.product = 0x0001;
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rcdev->input_id.version = 0x0100;
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rcdev->dev.parent = &pdev->dev;
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rcdev->driver_name = GPIO_IR_DRIVER_NAME;
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rcdev->min_timeout = 0;
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rcdev->timeout = GPIO_IR_TIMEOUT;
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rcdev->max_timeout = 10 * GPIO_IR_TIMEOUT;
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if (pdata->allowed_protos)
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rcdev->allowed_protocols = pdata->allowed_protos;
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else
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rcdev->allowed_protocols = RC_BIT_ALL;
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rcdev->map_name = pdata->map_name ?: RC_MAP_EMPTY;
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/* set up transmitter related values if needed */
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if (pdata->tx_capable) {
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rcdev->tx_ir = gpio_transmit_ir;
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rcdev->s_tx_carrier = gpio_set_tx_carrier;
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rcdev->s_tx_duty_cycle = gpio_set_tx_duty_cycle;
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}
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setup_timer(&gpio_dev->flush_timer, flush_timer,
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(unsigned long)gpio_dev);
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rc = gpio_request(pdata->gpio_rx_nr, "gpio-ir-recv");
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if (rc < 0)
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goto err_gpio_request;
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rc = gpio_direction_input(pdata->gpio_rx_nr);
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if (rc < 0)
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goto err_gpio_direction_input;
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/*the pulse always reversed*/
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pdata->active_low = gpio_get_value(pdata->gpio_rx_nr);
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if (!pdata->pwm_tx_used) {
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rc = gpio_request(pdata->gpio_tx_nr, "gpio-ir-trans");
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if (rc < 0)
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goto err_gpio_direction_input;
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rc = gpio_direction_output(pdata->gpio_tx_nr, 0);
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if (rc < 0)
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goto err_gpio_direction_output;
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gpio_dev->gpio_tx_nr = pdata->gpio_tx_nr;
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} else {
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gpio_dev->pwm_used = pdata->pwm_tx_used;
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gpio_dev->pwm_port = pdata->pwm_port;
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}
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gpio_dev->rcdev = rcdev;
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gpio_dev->gpio_rx_nr = pdata->gpio_rx_nr;
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gpio_dev->active_low = pdata->active_low;
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gpio_dev->tx_carrier_freq = GPIO_IR_CARRIER_FREQ;
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gpio_dev->tx_duty_cycle = GPIO_IR_DUTY_CYCLE;
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/* initialize spinlocks */
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spin_lock_init(&gpio_dev->tx_lock);
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spin_lock_init(&gpio_dev->carr_lock);
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init_completion(&gpio_dev->tx_completion);
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mutex_init(&gpio_dev->pwm_lock);
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rc = rc_register_device(rcdev);
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if (rc < 0) {
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dev_err(&pdev->dev, "failed to register rc device\n");
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goto err_register_rc_device;
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}
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platform_set_drvdata(pdev, gpio_dev);
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rc = request_any_context_irq(gpio_to_irq(pdata->gpio_rx_nr),
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gpio_ir_recv_irq,
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IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
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"gpio-ir-recv-irq", gpio_dev);
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if (rc < 0)
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goto err_request_irq;
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if (pdata->pwm_tx_used) {
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gpio_dev->pwm = pwm_request(gpio_dev->pwm_port, "ir tx");
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if (IS_ERR(gpio_dev->pwm)) {
|
|
dev_err(&pdev->dev, "Unable to request PWM for ir dev!\n");
|
|
goto err_request_pwm;
|
|
}
|
|
}
|
|
|
|
dev_info(&pdev->dev, "gpio ir probe succeed\n");
|
|
return 0;
|
|
|
|
err_request_pwm:
|
|
free_irq(gpio_to_irq(gpio_dev->gpio_rx_nr), gpio_dev);
|
|
err_request_irq:
|
|
rc_unregister_device(rcdev);
|
|
err_register_rc_device:
|
|
err_gpio_direction_output:
|
|
gpio_free(pdata->gpio_tx_nr);
|
|
err_gpio_direction_input:
|
|
gpio_free(pdata->gpio_rx_nr);
|
|
err_gpio_request:
|
|
rc_free_device(rcdev);
|
|
err_allocate_device:
|
|
kfree(gpio_dev);
|
|
return rc;
|
|
}
|
|
|
|
static int gpio_ir_recv_remove(struct platform_device *pdev)
|
|
{
|
|
struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
|
|
|
|
free_irq(gpio_to_irq(gpio_dev->gpio_rx_nr), gpio_dev);
|
|
del_timer_sync(&gpio_dev->flush_timer);
|
|
rc_unregister_device(gpio_dev->rcdev);
|
|
gpio_free(gpio_dev->gpio_rx_nr);
|
|
pwm_free(gpio_dev->pwm);
|
|
kfree(gpio_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int gpio_ir_recv_suspend(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
|
|
|
|
if (device_may_wakeup(dev))
|
|
enable_irq_wake(gpio_to_irq(gpio_dev->gpio_rx_nr));
|
|
else
|
|
disable_irq(gpio_to_irq(gpio_dev->gpio_rx_nr));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gpio_ir_recv_resume(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
|
|
|
|
if (device_may_wakeup(dev))
|
|
disable_irq_wake(gpio_to_irq(gpio_dev->gpio_rx_nr));
|
|
else
|
|
enable_irq(gpio_to_irq(gpio_dev->gpio_rx_nr));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops gpio_ir_recv_pm_ops = {
|
|
.suspend = gpio_ir_recv_suspend,
|
|
.resume = gpio_ir_recv_resume,
|
|
};
|
|
#endif
|
|
|
|
static struct platform_driver gpio_ir_recv_driver = {
|
|
.probe = gpio_ir_recv_probe,
|
|
.remove = gpio_ir_recv_remove,
|
|
.driver = {
|
|
.name = GPIO_IR_DRIVER_NAME,
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = gpio_ir_recv_of_match,
|
|
#ifdef CONFIG_PM
|
|
.pm = &gpio_ir_recv_pm_ops,
|
|
#endif
|
|
},
|
|
};
|
|
module_platform_driver(gpio_ir_recv_driver);
|
|
|
|
MODULE_DESCRIPTION("GPIO IR Receiver driver");
|
|
MODULE_AUTHOR("xudong@allwinnertech.com");
|
|
MODULE_LICENSE("GPL v2");
|