static int pcf85063_probe()

in rtc-pcf85063.c [525:605]

• 67 lines of code
• 12 McCabe index (conditional complexity)

static int pcf85063_probe(struct i2c_client *client)
{
	struct pcf85063 *pcf85063;
	unsigned int tmp;
	int err;
	const struct pcf85063_config *config = &pcf85063tp_config;
	const void *data = of_device_get_match_data(&client->dev);
	struct nvmem_config nvmem_cfg = {
		.name = "pcf85063_nvram",
		.reg_read = pcf85063_nvmem_read,
		.reg_write = pcf85063_nvmem_write,
		.type = NVMEM_TYPE_BATTERY_BACKED,
		.size = 1,
	};

	dev_dbg(&client->dev, "%s\n", __func__);

	pcf85063 = devm_kzalloc(&client->dev, sizeof(struct pcf85063),
				GFP_KERNEL);
	if (!pcf85063)
		return -ENOMEM;

	if (data)
		config = data;

	pcf85063->regmap = devm_regmap_init_i2c(client, &config->regmap);
	if (IS_ERR(pcf85063->regmap))
		return PTR_ERR(pcf85063->regmap);

	i2c_set_clientdata(client, pcf85063);

	err = regmap_read(pcf85063->regmap, PCF85063_REG_CTRL1, &tmp);
	if (err) {
		dev_err(&client->dev, "RTC chip is not present\n");
		return err;
	}

	pcf85063->rtc = devm_rtc_allocate_device(&client->dev);
	if (IS_ERR(pcf85063->rtc))
		return PTR_ERR(pcf85063->rtc);

	err = pcf85063_load_capacitance(pcf85063, client->dev.of_node,
					config->force_cap_7000 ? 7000 : 0);
	if (err < 0)
		dev_warn(&client->dev, "failed to set xtal load capacitance: %d",
			 err);

	pcf85063->rtc->ops = &pcf85063_rtc_ops;
	pcf85063->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
	pcf85063->rtc->range_max = RTC_TIMESTAMP_END_2099;
	pcf85063->rtc->uie_unsupported = 1;
	clear_bit(RTC_FEATURE_ALARM, pcf85063->rtc->features);

	if (config->has_alarms && client->irq > 0) {
		err = devm_request_threaded_irq(&client->dev, client->irq,
						NULL, pcf85063_rtc_handle_irq,
						IRQF_TRIGGER_LOW | IRQF_ONESHOT,
						"pcf85063", pcf85063);
		if (err) {
			dev_warn(&pcf85063->rtc->dev,
				 "unable to request IRQ, alarms disabled\n");
		} else {
			set_bit(RTC_FEATURE_ALARM, pcf85063->rtc->features);
			device_init_wakeup(&client->dev, true);
			err = dev_pm_set_wake_irq(&client->dev, client->irq);
			if (err)
				dev_err(&pcf85063->rtc->dev,
					"failed to enable irq wake\n");
		}
	}

	nvmem_cfg.priv = pcf85063->regmap;
	devm_rtc_nvmem_register(pcf85063->rtc, &nvmem_cfg);

#ifdef CONFIG_COMMON_CLK
	/* register clk in common clk framework */
	pcf85063_clkout_register_clk(pcf85063);
#endif

	return devm_rtc_register_device(pcf85063->rtc);
}