288 lines
6.9 KiB
C
288 lines
6.9 KiB
C
#include <linux/module.h>
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#include <linux/gpio.h>
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/of_gpio.h>
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#include <linux/clk.h>
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#include <linux/regulator/consumer.h>
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#include <linux/platform_device.h>
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#include <linux/sys_config.h>
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#include <linux/etherdevice.h>
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#include <linux/pinctrl/pinconf-sunxi.h>
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struct sunxi_gps_platdata {
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struct regulator *gps_power;
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struct clk *lpo;
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int gpio_gps_nstandby;
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char *gps_power_name;
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int nstandby_state;
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struct platform_device *pdev;
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};
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static struct sunxi_gps_platdata *gps_data;
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static DEFINE_MUTEX(sunxi_gps_mutex);
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static ssize_t nstandby_state_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%d\n", gps_data->nstandby_state);
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}
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static int sunxi_gps_power(struct sunxi_gps_platdata *data, bool on_off)
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{
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struct platform_device *pdev = data->pdev;
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struct device *dev = &pdev->dev;
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int ret = 0;
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if (on_off) {
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ret = regulator_enable(data->gps_power);
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if (ret < 0) {
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dev_err(dev, "regulator gps_power enable failed\n");
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return ret;
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}
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ret = regulator_get_voltage(data->gps_power);
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if (ret < 0) {
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dev_err(dev, "regulator gps_power get voltage failed\n");
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return ret;
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}
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dev_info(dev, "check gps_power voltage: %d\n", ret);
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} else {
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ret = regulator_disable(data->gps_power);
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if (ret < 0) {
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dev_err(dev, "regulator gps_power disable failed\n");
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return ret;
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}
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}
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return 0;
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}
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static ssize_t nstandby_state_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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unsigned long state;
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int err;
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dev_info(dev, "set nstandby_state: %s\n", buf);
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err = kstrtoul(buf, 0, &state);
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if (err)
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return err;
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if (state > 1)
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return -EINVAL;
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mutex_lock(&sunxi_gps_mutex);
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if (state != gps_data->nstandby_state &&
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gpio_is_valid(gps_data->gpio_gps_nstandby)) {
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err = gpio_direction_output(gps_data->gpio_gps_nstandby, state);
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if (err) {
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dev_err(dev, "set power failed\n");
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} else {
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gps_data->nstandby_state = state;
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}
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}
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mutex_unlock(&sunxi_gps_mutex);
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return count;
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}
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static DEVICE_ATTR(nstandby_state, S_IWUSR | S_IWGRP | S_IRUGO,
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nstandby_state_show, nstandby_state_store);
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static struct attribute *misc_attributes[] = {
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&dev_attr_nstandby_state.attr,
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NULL,
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};
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static struct attribute_group misc_attribute_group = {
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.name = "rf-ctrl",
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.attrs = misc_attributes,
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};
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static struct miscdevice sunxi_gps_dev = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "sunxi-gps",
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};
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static int sunxi_gps_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct device *dev = &pdev->dev;
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struct sunxi_gps_platdata *data = NULL;
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struct gpio_config config;
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const char *power = NULL;
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char pin_name[32] = {0};
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int clk_gpio = 0;
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unsigned long pin_config = 0;
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int ret = 0;
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!dev)
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return -ENOMEM;
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data->pdev = pdev;
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gps_data = data;
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if (of_property_read_string(np, "gps_power", &power)) {
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dev_warn(dev, "Missing gps_power.\n");
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} else {
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data->gps_power_name = devm_kzalloc(dev, 64, GFP_KERNEL);
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if (!data->gps_power_name) {
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return -ENOMEM;
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} else {
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strcpy(data->gps_power_name, power);
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dev_info(dev, "gps_power_name (%s)\n",
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data->gps_power_name);
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}
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data->gps_power = regulator_get(dev, data->gps_power_name);
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if (!IS_ERR(data->gps_power)) {
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ret = sunxi_gps_power(data, 1);
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if (ret) {
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dev_err(dev, "gps power on failed\n");
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return ret;
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} else {
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dev_info(dev, "gps power on success\n");
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}
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}
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}
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data->gpio_gps_nstandby = of_get_named_gpio_flags(np,
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"gps_nstandby", 0, (enum of_gpio_flags *)&config);
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if (!gpio_is_valid(data->gpio_gps_nstandby)) {
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dev_err(dev, "get gpio gps_nstandby failed\n");
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} else {
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dev_info(dev, "gps_nstandby gpio=%d mul-sel=%d pull=%d drv_level=%d data=%d\n",
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config.gpio,
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config.mul_sel,
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config.pull,
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config.drv_level,
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config.data);
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ret = devm_gpio_request(dev, data->gpio_gps_nstandby,
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"gps_nstandby");
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if (ret < 0) {
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dev_err(dev, "can't request gps_nstandby gpio %d\n",
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data->gpio_gps_nstandby);
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return ret;
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}
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ret = gpio_direction_output(data->gpio_gps_nstandby, 0);
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if (ret < 0) {
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dev_err(dev, "can't request output direction gps_nstandby gpio %d\n",
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data->gpio_gps_nstandby);
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return ret;
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} else {
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data->nstandby_state = 0;
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}
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}
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clk_gpio = of_get_named_gpio_flags(np, "gps_clk_gpio", 0,
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(enum of_gpio_flags *)&config);
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if (!gpio_is_valid(clk_gpio)) {
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dev_err(dev, "get gpio gps_clk_gpio failed\n");
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} else {
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dev_info(dev, "gps_clk_gpio gpio=%d mul-sel=%d pull=%d drv_level=%d data=%d\n",
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config.gpio,
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config.mul_sel,
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config.pull,
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config.drv_level,
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config.data);
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ret = devm_gpio_request(dev, clk_gpio, "gps_clk_gpio");
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if (ret < 0) {
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dev_err(dev, "can't request gps_clk_gpio gpio %d\n",
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clk_gpio);
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return ret;
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}
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sunxi_gpio_to_name(config.gpio, pin_name);
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pin_config = SUNXI_PINCFG_PACK(SUNXI_PINCFG_TYPE_FUNC,
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config.mul_sel);
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pin_config_set(SUNXI_PINCTRL, pin_name, pin_config);
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}
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data->lpo = of_clk_get(np, 0);
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if (IS_ERR_OR_NULL(data->lpo)) {
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dev_warn(dev, "clk not config\n");
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} else {
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dev_warn(dev, "enable clk\n");
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ret = clk_prepare_enable(data->lpo);
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if (ret < 0)
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dev_warn(dev, "can't enable clk\n");
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}
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ret = misc_register(&sunxi_gps_dev);
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if (ret) {
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dev_err(dev, "sunxi-gps register driver as misc device error!\n");
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return ret;
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}
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ret = sysfs_create_group(&sunxi_gps_dev.this_device->kobj,
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&misc_attribute_group);
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if (ret) {
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dev_err(dev, "sunxi-gps register sysfs create group failed!\n");
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return ret;
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}
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return 0;
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}
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#ifdef CONFIG_PM
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static int sunxi_gps_suspend(struct platform_device *pdev, pm_message_t state)
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{
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if (gps_data->nstandby_state &&
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gpio_is_valid(gps_data->gpio_gps_nstandby)) {
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gpio_direction_output(gps_data->gpio_gps_nstandby, 0);
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}
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return 0;
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}
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static int sunxi_gps_resume(struct platform_device *pdev)
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{
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if (gps_data->nstandby_state &&
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gpio_is_valid(gps_data->gpio_gps_nstandby)) {
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gpio_direction_output(gps_data->gpio_gps_nstandby, 1);
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}
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return 0;
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}
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#endif
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static int sunxi_gps_remove(struct platform_device *pdev)
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{
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WARN_ON(0 != misc_deregister(&sunxi_gps_dev));
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sysfs_remove_group(&(sunxi_gps_dev.this_device->kobj),
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&misc_attribute_group);
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if (!IS_ERR_OR_NULL(gps_data->lpo)) {
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clk_disable_unprepare(gps_data->lpo);
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clk_put(gps_data->lpo);
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}
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if (!IS_ERR(gps_data->gps_power)) {
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sunxi_gps_power(gps_data, 0);
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regulator_put(gps_data->gps_power);
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}
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return 0;
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}
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static const struct of_device_id sunxi_gps_ids[] = {
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{ .compatible = "allwinner,sunxi-gps" },
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{ /* Sentinel */ }
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};
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static struct platform_driver sunxi_gps_driver = {
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.probe = sunxi_gps_probe,
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.remove = sunxi_gps_remove,
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#ifdef CONFIG_PM
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.suspend = sunxi_gps_suspend,
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.resume = sunxi_gps_resume,
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#endif
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.driver = {
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.owner = THIS_MODULE,
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.name = "sunxi-gps",
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.of_match_table = sunxi_gps_ids,
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},
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};
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module_platform_driver(sunxi_gps_driver);
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MODULE_DESCRIPTION("sunxi gps driver");
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MODULE_LICENSE(GPL);
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