On Thu, Aug 18, 2011 at 04:22:15PM +0530, Keerthy wrote:
...
> +static int omap_temp_sensor_clk_enable(struct omap_temp_sensor *temp_sensor)
> +{
> + u32 ret = 0;
> +
> + if (temp_sensor->clk_on) {
> + dev_err(temp_sensor->hwmon_dev, "clock already on\n");
> + goto out;
> + }
> +
> + ret = pm_runtime_get_sync(temp_sensor->hwmon_dev);
> + if (ret < 0) {
> + dev_err(temp_sensor->hwmon_dev, "get sync failed\n");
> + goto out;
> + }
> +
> + temp_sensor->clk_on = 1;
Probably should hold the mutex around this to keep clk_on consistent
with runtime PM state (and in disable method).
...
> +static int __devinit omap_temp_sensor_probe(struct platform_device *pdev)
> +{
> + struct omap_temp_sensor_pdata *pdata = pdev->dev.platform_data;
> + struct omap_temp_sensor *temp_sensor;
> + struct resource *mem;
> + int ret = 0;
> + int val, clk_rate;
> +
> + if (!pdata) {
> + dev_err(&pdev->dev, "platform data missing\n");
> + return -EINVAL;
> + }
> +
> + temp_sensor = kzalloc(sizeof(*temp_sensor), GFP_KERNEL);
> + if (!temp_sensor)
> + return -ENOMEM;
> +
> + mutex_init(&temp_sensor->sensor_mutex);
> +
> + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!mem) {
> + dev_err(&pdev->dev, "no mem resource\n");
> + ret = -ENOMEM;
> + goto plat_res_err;
> + }
> +
> + temp_sensor->irq = platform_get_irq_byname(pdev, "thermal_alert");
> + if (temp_sensor->irq < 0) {
> + dev_err(&pdev->dev, "get_irq_byname failed\n");
> + ret = temp_sensor->irq;
> + goto plat_res_err;
> + }
> +
> + temp_sensor->phy_base = ioremap(mem->start, resource_size(mem));
> + temp_sensor->clock = NULL;
> + temp_sensor->registers = pdata->registers;
> + temp_sensor->hwmon_dev = &pdev->dev;
> +
> + pm_runtime_enable(&pdev->dev);
> + pm_runtime_irq_safe(&pdev->dev);
> +
> + /*
> + * check if the efuse has a non-zero value if not
> + * it is an untrimmed sample and the temperatures
> + * may not be accurate
> + */
> +
> + if (omap_temp_sensor_readl(temp_sensor,
> + temp_sensor->registers->bgap_efuse))
> + temp_sensor->is_efuse_valid = 1;
> +
> + platform_set_drvdata(pdev, temp_sensor);
> + dev_set_drvdata(&pdev->dev, temp_sensor);
> + temp_sensor->clock = clk_get(temp_sensor->hwmon_dev, "fck");
> + if (IS_ERR(temp_sensor->clock)) {
> + ret = PTR_ERR(temp_sensor->clock);
> + dev_err(temp_sensor->hwmon_dev,
> + "unable to get fclk: %d\n", ret);
> + ret = -EINVAL;
> + goto plat_res_err;
> + }
> +
> + ret = omap_temp_sensor_clk_enable(temp_sensor);
> + if (ret) {
> + dev_err(&pdev->dev, "Cannot enable temp sensor\n");
> + goto clken_err;
> + }
> +
> + clk_rate = clk_round_rate(temp_sensor->clock, 2000000);
> + if (clk_rate < 1000000 || clk_rate == 0xffffffff) {
> + dev_err(&pdev->dev, "Error round rate\n");
> + ret = -EINVAL;
> + goto clken_err;
> + }
> +
> + ret = clk_set_rate(temp_sensor->clock, clk_rate);
> + if (ret) {
> + dev_err(&pdev->dev, "Cannot set clock rate\n");
> + goto clken_err;
> + }
> +
> + temp_sensor->clk_rate = clk_rate;
> + omap_enable_continuous_mode(temp_sensor, 1);
> + omap_configure_temp_sensor_thresholds(temp_sensor);
> + /* 1 ms */
> + omap_configure_temp_sensor_counter(temp_sensor, 1);
> +
> + /* Wait till the first conversion is done wait for at least 1ms */
> + usleep_range(1000, 2000);
> +
> + /* Read the temperature once due to hw issue*/
> + omap_temp_sensor_readl(temp_sensor,
> + temp_sensor->registers->temp_sensor_ctrl);
> +
> + /* Set 2 seconds time as default counter */
> + omap_configure_temp_sensor_counter(temp_sensor,
> + temp_sensor->clk_rate * 2);
> +
> + temp_sensor->hwmon_dev = hwmon_device_register(&pdev->dev);
> + if (IS_ERR(temp_sensor->hwmon_dev)) {
> + dev_err(&pdev->dev, "hwmon_device_register failed.\n");
> + ret = PTR_ERR(temp_sensor->hwmon_dev);
> + goto hwmon_reg_err;
> + }
> +
> + ret = sysfs_create_group(&pdev->dev.kobj,
> + &omap_temp_sensor_group);
> + if (ret) {
> + dev_err(&pdev->dev, "could not create sysfs files\n");
> + goto sysfs_create_err;
> + }
> +
> + kobject_uevent(&temp_sensor->hwmon_dev->kobj, KOBJ_ADD);
> +
> + ret = request_threaded_irq(temp_sensor->irq, NULL,
> + omap_talert_irq_handler, IRQF_TRIGGER_RISING | IRQF_ONESHOT,
> + "temp_sensor", temp_sensor);
> + if (ret) {
> + dev_err(&pdev->dev, "Request threaded irq failed.\n");
> + goto req_irq_err;
> + }
> +
> + /* unmask the T_COLD and unmask T_HOT at init */
> + val = omap_temp_sensor_readl(temp_sensor,
> + temp_sensor->registers->bgap_mask_ctrl);
> + val |= temp_sensor->registers->mask_cold_mask
> + | temp_sensor->registers->mask_hot_mask;
> +
> + omap_temp_sensor_writel(temp_sensor, val,
> + temp_sensor->registers->bgap_mask_ctrl);
> +
> + return 0;
> +
> +req_irq_err:
> + kobject_uevent(&temp_sensor->hwmon_dev->kobj, KOBJ_REMOVE);
> + sysfs_remove_group(&temp_sensor->hwmon_dev->kobj,
> + &omap_temp_sensor_group);
> +sysfs_create_err:
> + hwmon_device_unregister(&pdev->dev);
> +hwmon_reg_err:
> + omap_temp_sensor_clk_disable(temp_sensor);
> +clken_err:
> + clk_put(temp_sensor->clock);
> +plat_res_err:
> + mutex_destroy(&temp_sensor->sensor_mutex);
> + kfree(temp_sensor);
Should also:
platform_set_drvdata(pdev, NULL);
dev_set_drvdata(&pdev->dev, NULL);
> + return ret;
> +}
> +
> +static int __devexit omap_temp_sensor_remove(struct platform_device *pdev)
> +{
> + struct omap_temp_sensor *temp_sensor = platform_get_drvdata(pdev);
> +
> + hwmon_device_unregister(&pdev->dev);
> + kobject_uevent(&temp_sensor->hwmon_dev->kobj, KOBJ_REMOVE);
> + sysfs_remove_group(&temp_sensor->hwmon_dev->kobj,
> + &omap_temp_sensor_group);
> + omap_temp_sensor_clk_disable(temp_sensor);
> + clk_put(temp_sensor->clock);
> + platform_set_drvdata(pdev, NULL);
And:
dev_set_drvdata(&pdev->dev, NULL);
> + free_irq(temp_sensor->irq, temp_sensor);
Need to free IRQ before clock is disabled (else ISR may access while
clock stopped, possible L3 interconnect error and ARM imprecise
external abort)?
> + mutex_destroy(&temp_sensor->sensor_mutex);
> + kfree(temp_sensor);
> +
> + return 0;
> +}
Todd
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