rfkill-gpio.rar_platform linux gpio

#include <linux/gpio.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/rfkill.h> #include <linux/platform_device.h> #include <linux/clk.h> #include <linux/slab.h> #include <linux/acpi.h> #include <linux/acpi_gpio.h> #include <linux/rfkill-gpio.h> struct rfkill_gpio_data { const char *name; enum rfkill_type type; int reset_gpio; int shutdown_gpio; struct rfkill *rfkill_dev; char *reset_name; char *shutdown_name; struct clk *clk; bool clk_enabled; }; static int rfkill_gpio_set_power(void *data, bool blocked) { struct rfkill_gpio_data *rfkill = data; if (blocked) { if (gpio_is_valid(rfkill->shutdown_gpio)) gpio_set_value(rfkill->shutdown_gpio, 0); if (gpio_is_valid(rfkill->reset_gpio)) gpio_set_value(rfkill->reset_gpio, 0); if (!IS_ERR(rfkill->clk) && rfkill->clk_enabled) clk_disable(rfkill->clk); } else { if (!IS_ERR(rfkill->clk) && !rfkill->clk_enabled) clk_enable(rfkill->clk); if (gpio_is_valid(rfkill->reset_gpio)) gpio_set_value(rfkill->reset_gpio, 1); if (gpio_is_valid(rfkill->shutdown_gpio)) gpio_set_value(rfkill->shutdown_gpio, 1); } rfkill->clk_enabled = blocked; return 0; } static const struct rfkill_ops rfkill_gpio_ops = { .set_block = rfkill_gpio_set_power, }; static int rfkill_gpio_acpi_probe(struct device *dev, struct rfkill_gpio_data *rfkill) { const struct acpi_device_id *id; id = acpi_match_device(dev->driver->acpi_match_table, dev); if (!id) return -ENODEV; rfkill->name = dev_name(dev); rfkill->type = (unsigned)id->driver_data; rfkill->reset_gpio = acpi_get_gpio_by_index(dev, 0, NULL); rfkill->shutdown_gpio = acpi_get_gpio_by_index(dev, 1, NULL); return 0; } static int rfkill_gpio_probe(struct platform_device *pdev) { struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data; struct rfkill_gpio_data *rfkill; const char *clk_name = NULL; int ret = 0; int len = 0; rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL); if (!rfkill) return -ENOMEM; if (ACPI_HANDLE(&pdev->dev)) { ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill); if (ret) return ret; } else if (pdata) { clk_name = pdata->power_clk_name; rfkill->name = pdata->name; rfkill->type = pdata->type; rfkill->reset_gpio = pdata->reset_gpio; rfkill->shutdown_gpio = pdata->shutdown_gpio; } else { return -ENODEV; } /* make sure at-least one of the GPIO is defined and that * a name is specified for this instance */ if ((!gpio_is_valid(rfkill->reset_gpio) && !gpio_is_valid(rfkill->shutdown_gpio)) || !rfkill->name) { pr_warn("%s: invalid platform data\n", __func__); return -EINVAL; } if (pdata && pdata->gpio_runtime_setup) { ret = pdata->gpio_runtime_setup(pdev); if (ret) { pr_warn("%s: can't set up gpio\n", __func__); return ret; } } len = strlen(rfkill->name); rfkill->reset_name = devm_kzalloc(&pdev->dev, len + 7, GFP_KERNEL); if (!rfkill->reset_name) return -ENOMEM; rfkill->shutdown_name = devm_kzalloc(&pdev->dev, len + 10, GFP_KERNEL); if (!rfkill->shutdown_name) return -ENOMEM; snprintf(rfkill->reset_name, len + 6 , "%s_reset", rfkill->name); snprintf(rfkill->shutdown_name, len + 9, "%s_shutdown", rfkill->name); rfkill->clk = devm_clk_get(&pdev->dev, clk_name); if (gpio_is_valid(rfkill->reset_gpio)) { ret = devm_gpio_request_one(&pdev->dev, rfkill->reset_gpio, 0, rfkill->reset_name); if (ret) { pr_warn("%s: failed to get reset gpio.\n", __func__); return ret; } } if (gpio_is_valid(rfkill->shutdown_gpio)) { ret = devm_gpio_request_one(&pdev->dev, rfkill->shutdown_gpio, 0, rfkill->shutdown_name); if (ret) { pr_warn("%s: failed to get shutdown gpio.\n", __func__); return ret; } } rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev, rfkill->type, &rfkill_gpio_ops, rfkill); if (!rfkill->rfkill_dev) return -ENOMEM; ret = rfkill_register(rfkill->rfkill_dev); if (ret < 0) return ret; platform_set_drvdata(pdev, rfkill); dev_info(&pdev->dev, "%s device registered.\n", rfkill->name); return 0; } static int rfkill_gpio_remove(struct platform_device *pdev) { struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev); struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data; if (pdata && pdata->gpio_runtime_close) pdata->gpio_runtime_close(pdev); rfkill_unregister(rfkill->rfkill_dev); rfkill_destroy(rfkill->rfkill_dev); return 0; } static const struct acpi_device_id rfkill_acpi_match[] = { { "BCM4752", RFKILL_TYPE_GPS }, { }, }; static struct platform_driver rfkill_gpio_driver = { .probe = rfkill_gpio_probe, .remove = rfkill_gpio_remove, .driver = { .name = "rfkill_gpio", .owner = THIS_MODULE, .acpi_match_table = ACPI_PTR(rfkill_acpi_match), }, }; module_platform_driver(rfkill_gpio_driver); MODULE_DESCRIPTION("gpio rfkill"); MODULE_AUTHOR("NVIDIA"); MODULE_LICENSE("GPL");