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Date: Fri, 27 Sep 2013 11:25:50 +0100
From: Srinivas KANDAGATLA <srinivas.kandagatla@...com>
To: Prabhakar Lad <prabhakar.csengg@...il.com>
Cc: linux-media <linux-media@...r.kernel.org>,
Rob Herring <rob.herring@...xeda.com>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Stephen Warren <swarren@...dotorg.org>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Rob Landley <rob@...dley.net>,
Mauro Carvalho Chehab <m.chehab@...sung.com>,
Grant Likely <grant.likely@...aro.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
LDOC <linux-doc@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5] media: st-rc: Add ST remote control driver
Thanks Prabhakar,
>> +config RC_ST
>> + tristate "ST remote control receiver"
>> + depends on ARCH_STI && RC_CORE
>> + help
>> + Say Y here if you want support for ST remote control driver
>> + which allows both IR and UHF RX.
>> + The driver passes raw pluse and space information to the LIRC decoder.
>> +
> s/pluse/pulse
>
Yep.. Will fix it..
[...]
>> +
>> +/* Registers */
>> +#define IRB_SAMPLE_RATE_COMM 0x64 /* sample freq divisor*/
>> +#define IRB_CLOCK_SEL 0x70 /* clock select */
>> +#define IRB_CLOCK_SEL_STATUS 0x74 /* clock status */
>> +/* IRB IR/UHF receiver registers */
>> +#define IRB_RX_ON 0x40 /* pulse time capture */
>> +#define IRB_RX_SYS 0X44 /* sym period capture */
>> +#define IRB_RX_INT_EN 0x48 /* IRQ enable (R/W) */
>> +#define IRB_RX_INT_STATUS 0x4C /* IRQ status (R/W) */
>> +#define IRB_RX_EN 0x50 /* Receive enablei */
> s/enablei/enable
>
>> +#define IRB_MAX_SYM_PERIOD 0x54 /* max sym value */
>> +#define IRB_RX_INT_CLEAR 0x58 /* overrun status */
>> +#define IRB_RX_STATUS 0x6C /* receive status */
>> +#define IRB_RX_NOISE_SUPPR 0x5C /* noise suppression */
>> +#define IRB_RX_POLARITY_INV 0x68 /* polarity inverter */
>> +
> generally smaller case hex letters are preferred
I will change this.
[...]
>> +
>> +static int st_rc_probe(struct platform_device *pdev)
>> +{
>> + int ret = -EINVAL;
>> + struct rc_dev *rdev;
>> + struct device *dev = &pdev->dev;
>> + struct resource *res;
>> + struct st_rc_device *rc_dev;
>> + struct device_node *np = pdev->dev.of_node;
>> + const char *rx_mode;
>> +
>> + rc_dev = devm_kzalloc(dev, sizeof(struct st_rc_device), GFP_KERNEL);
>> +
>> + if (!rc_dev)
>> + return -ENOMEM;
>> +
>> + rdev = rc_allocate_device();
>> +
>> + if (!rdev)
>> + return -ENOMEM;
>> +
>> + if (np && !of_property_read_string(np, "rx-mode", &rx_mode)) {
>> +
>> + if (!strcmp(rx_mode, "uhf")) {
>> + rc_dev->rxuhfmode = true;
>> + } else if (!strcmp(rx_mode, "infrared")) {
>> + rc_dev->rxuhfmode = false;
>> + } else {
>> + dev_err(dev, "Unsupported rx mode [%s]\n", rx_mode);
>> + goto err;
>> + }
>> +
>> + } else {
>> + goto err;
>> + }
>> +
>> + rc_dev->sys_clock = devm_clk_get(dev, NULL);
>> + if (IS_ERR(rc_dev->sys_clock)) {
>> + dev_err(dev, "System clock not found\n");
>> + ret = PTR_ERR(rc_dev->sys_clock);
>> + goto err;
>> + }
>> +
>> + rc_dev->irq = platform_get_irq(pdev, 0);
>> + if (rc_dev->irq < 0) {
>> + ret = rc_dev->irq;
>> + goto clkerr;
>> + }
>> +
>> + ret = -ENODEV;
> Not required
yes, its redundant here.
>
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + if (!res)
>> + goto clkerr;
>> +
> This check is not required.
Ok, I see your point.
>
>> + rc_dev->base = devm_ioremap_resource(dev, res);
>> + if (IS_ERR(rc_dev->base))
>> + goto clkerr;
>> +
> In case of error assin ret to PTR_ERR(rc_dev->base)
Yes It makes sense .. I will assign it to ret.
Also found that there is a typo here.
It should be a goto err instead of goto clkerr.
Will fix that as well in next spin.
>
>> + if (rc_dev->rxuhfmode)
>> + rc_dev->rx_base = rc_dev->base + 0x40;
>> + else
>> + rc_dev->rx_base = rc_dev->base;
>> +
>> + rc_dev->dev = dev;
>> + platform_set_drvdata(pdev, rc_dev);
>> + st_rc_hardware_init(rc_dev);
>> +
>> + rdev->driver_type = RC_DRIVER_IR_RAW;
>> + rdev->allowed_protos = RC_BIT_ALL;
>> + /* rx sampling rate is 10Mhz */
>> + rdev->rx_resolution = 100;
>> + rdev->timeout = US_TO_NS(MAX_SYMB_TIME);
>> + rdev->priv = rc_dev;
>> + rdev->open = st_rc_open;
>> + rdev->close = st_rc_close;
>> + rdev->driver_name = IR_ST_NAME;
>> + rdev->map_name = RC_MAP_LIRC;
>> + rdev->input_name = "ST Remote Control Receiver";
>> +
>> + /* enable wake via this device */
>> + device_set_wakeup_capable(dev, true);
>> + device_set_wakeup_enable(dev, true);
>> +
>> + ret = rc_register_device(rdev);
>> + if (ret < 0)
>> + goto clkerr;
>> +
>> + rc_dev->rdev = rdev;
>> + if (devm_request_irq(dev, rc_dev->irq, st_rc_rx_interrupt,
>> + IRQF_NO_SUSPEND, IR_ST_NAME, rc_dev) < 0) {
>> + dev_err(dev, "IRQ %d register failed\n", rc_dev->irq);
>> + ret = -EINVAL;
>> + goto rcerr;
>> + }
>> +
>> + /**
>> + * for LIRC_MODE_MODE2 or LIRC_MODE_PULSE or LIRC_MODE_RAW
>> + * lircd expects a long space first before a signal train to sync.
>> + */
>> + st_rc_send_lirc_timeout(rdev);
>> +
>> + dev_info(dev, "setup in %s mode\n", rc_dev->rxuhfmode ? "UHF" : "IR");
>> +
>> + return ret;
>> +rcerr:
>> + rc_unregister_device(rdev);
>> + rdev = NULL;
>> +clkerr:
>> + clk_disable_unprepare(rc_dev->sys_clock);
>> +err:
>> + rc_free_device(rdev);
>> + dev_err(dev, "Unable to register device (%d)\n", ret);
>> + return ret;
>> +}
>> +
thanks,
srini
>
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