On 08/28/2014 08:46 PM, Zhangfei Gao wrote:
From: Guoxiong Yan <yanguoxi...@huawei.com>
IR transmitter driver for Hisilicon hix5hd2 soc
By default all protocols are disabled.
For example nec decoder can be enabled by either
1. ir-keytable -p nec
2. echo nec > /sys/class/rc/rc0/protocols
See see Documentation/ABI/testing/sysfs-class-rc
(...)
+static irqreturn_t hix5hd2_ir_rx_interrupt(int irq, void *data)
+{
+ u32 symb_num, symb_val, symb_time;
+ u32 data_l, data_h;
+ u32 irq_sr, i;
+ struct hix5hd2_ir_priv *priv = data;
+
+ irq_sr = readl_relaxed(priv->base + IR_INTS);
+ if (irq_sr & INTMS_OVERFLOW) {
+ /*
+ * we must read IR_DATAL first, then we can clean up
+ * IR_INTS availably since logic would not clear
+ * fifo when overflow, drv do the job
+ */
+ ir_raw_event_reset(priv->rdev);
+ symb_num = readl_relaxed(priv->base + IR_DATAH);
+ for (i = 0; i < symb_num; i++)
+ readl_relaxed(priv->base + IR_DATAL);
+
+ writel_relaxed(INT_CLR_OVERFLOW, priv->base + IR_INTC);
+ dev_info(priv->dev, "overflow, level=%d\n",
+ IR_CFG_INT_THRESHOLD);
+ }
+
+ if ((irq_sr & INTMS_SYMBRCV) || (irq_sr & INTMS_TIMEOUT)) {
+ DEFINE_IR_RAW_EVENT(ev);
+
+ symb_num = readl_relaxed(priv->base + IR_DATAH);
+ for (i = 0; i < symb_num; i++) {
+ symb_val = readl_relaxed(priv->base + IR_DATAL);
+ data_l = ((symb_val & 0xffff) * 10);
+ data_h = ((symb_val >> 16) & 0xffff) * 10;
+ symb_time = (data_l + data_h) / 10;
+
+ ev.duration = US_TO_NS(data_l);
+ ev.pulse = true;
+ ir_raw_event_store(priv->rdev, &ev);
+
+ if (symb_time < IR_CFG_SYMBOL_MAXWIDTH) {
+ ev.duration = US_TO_NS(data_h);
+ ev.pulse = false;
+ ir_raw_event_store(priv->rdev, &ev);
+ } else {
+ hix5hd2_ir_send_lirc_timeout(priv->rdev);
+ }
+ }
+
+ if (irq_sr & INTMS_SYMBRCV)
+ writel_relaxed(INT_CLR_RCV, priv->base + IR_INTC);
+ if (irq_sr & INTMS_TIMEOUT)
+ writel_relaxed(INT_CLR_TIMEOUT, priv->base + IR_INTC);
+ }
+
+ /* Empty software fifo */
+ ir_raw_event_handle(priv->rdev);
+ return IRQ_HANDLED;
+}
+
It looks good if the entire ISR() above the probe()/remove() functionalities
of the driver. Maximum of the developers follows this structure.
(...)
+static struct of_device_id hix5hd2_ir_table[] = {
+ { .compatible = "hisilicon,hix5hd2-ir", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, hix5hd2_ir_table);
+
Every driver put these device ids above *struct platform_driver* definition.
So that we can see the of_match_table....
+static int hix5hd2_ir_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct rc_dev *rdev;
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ struct hix5hd2_ir_priv *priv;
+ struct device_node *node = pdev->dev.of_node;
+
+ priv = devm_kzalloc(dev, sizeof(struct hix5hd2_ir_priv), GFP_KERNEL);
sizeof(*priv)...?
+ if (!priv)
+ return -ENOMEM;
+
(...)
+#endif
+
+static SIMPLE_DEV_PM_OPS(hix5hd2_ir_pm_ops, hix5hd2_ir_suspend,
+ hix5hd2_ir_resume);
+
We can move the device ids here....
+static struct platform_driver hix5hd2_ir_driver = {
+ .driver = {
+ .name = IR_HIX5HD2_NAME,
+ .of_match_table = hix5hd2_ir_table,
+ .pm = &hix5hd2_ir_pm_ops,
+ },
+ .probe = hix5hd2_ir_probe,
+ .remove = hix5hd2_ir_remove,
+};
+
+module_platform_driver(hix5hd2_ir_driver);
+
+MODULE_DESCRIPTION("RC Transceiver driver for hix5hd2 platforms");
+MODULE_AUTHOR("Guoxiong Yan <yanguoxi...@huawei.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:hix5hd2-ir");
--
Regards,
Varka Bhadram.
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