#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/init.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/delay.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/sunxi-gpio.h>
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#include <linux/rfkill.h>
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#define PWR_MAX 5
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struct modem_power_t {
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struct regulator *power;
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char *power_name;
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};
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struct sunxi_modem_platdata {
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struct regulator *power[PWR_MAX];
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char *power_name[PWR_MAX];
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bool power_state;
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int gpio_modem_rst;
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bool gpio_modem_rst_assert;
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struct rfkill *rfkill;
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struct platform_device *pdev;
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};
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static struct sunxi_modem_platdata *modem_data;
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static int sunxi_modem_on(struct sunxi_modem_platdata *data, bool on_off);
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static DEFINE_MUTEX(sunxi_modem_mutex);
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void sunxi_modem_set_power(bool on_off)
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{
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struct platform_device *pdev;
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int ret = 0;
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if (!modem_data)
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return;
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pdev = modem_data->pdev;
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mutex_lock(&sunxi_modem_mutex);
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if (on_off != modem_data->power_state) {
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ret = sunxi_modem_on(modem_data, on_off);
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if (ret)
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dev_err(&pdev->dev, "set power failed\n");
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}
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mutex_unlock(&sunxi_modem_mutex);
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}
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EXPORT_SYMBOL_GPL(sunxi_modem_set_power);
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static int sunxi_modem_on(struct sunxi_modem_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, i;
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if (on_off) {
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for (i = 0; i < PWR_MAX; i++) {
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if (!IS_ERR_OR_NULL(data->power[i])) {
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ret = regulator_enable(data->power[i]);
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if (ret < 0) {
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dev_err(dev, "modem power[%d] (%s) enable failed\n",
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i, data->power_name[i]);
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return ret;
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}
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ret = regulator_get_voltage(data->power[i]);
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if (ret < 0) {
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dev_err(dev, "modem power[%d] (%s) get voltage failed\n",
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i, data->power_name[i]);
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return ret;
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}
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dev_info(dev, "modem power[%d] (%s) voltage: %d\n",
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i, data->power_name[i], ret);
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}
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}
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if (gpio_is_valid(data->gpio_modem_rst)) {
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mdelay(10);
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gpio_set_value(data->gpio_modem_rst, !data->gpio_modem_rst_assert);
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}
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} else {
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if (gpio_is_valid(data->gpio_modem_rst))
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gpio_set_value(data->gpio_modem_rst, data->gpio_modem_rst_assert);
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for (i = 0; i < PWR_MAX; i++) {
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if (!IS_ERR_OR_NULL(data->power[i])) {
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ret = regulator_disable(data->power[i]);
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if (ret < 0) {
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dev_err(dev, "modem power[%d] (%s) disable failed\n",
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i, data->power_name[i]);
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return ret;
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}
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}
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}
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}
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data->power_state = on_off;
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return 0;
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}
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static int sunxi_modem_set_block(void *data, bool blocked)
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{
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struct sunxi_modem_platdata *platdata = data;
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struct platform_device *pdev = platdata->pdev;
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int ret;
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if (blocked != platdata->power_state) {
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dev_warn(&pdev->dev, "block state already is %d\n", blocked);
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return 0;
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}
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dev_info(&pdev->dev, "set block: %d\n", blocked);
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ret = sunxi_modem_on(platdata, !blocked);
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if (ret) {
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dev_err(&pdev->dev, "set block 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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static const struct rfkill_ops sunxi_modem_rfkill_ops = {
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.set_block = sunxi_modem_set_block,
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};
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static int sunxi_modem_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_modem_platdata *data;
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struct gpio_config config;
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int ret = 0;
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int count, i;
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if (!dev) {
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pr_err("dev is null!\n");
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return -ENOMEM;
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}
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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data->pdev = pdev;
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count = of_property_count_strings(np, "modem_power");
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if (count <= 0) {
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dev_warn(dev, "Missing modem_power.\n");
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} else {
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if (count > PWR_MAX) {
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dev_warn(dev, "modem power count large than max(%d > %d).\n",
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count, PWR_MAX);
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count = PWR_MAX;
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}
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ret = of_property_read_string_array(np, "modem_power",
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(const char **)data->power_name, count);
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if (ret < 0)
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return -ENOMEM;
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}
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for (i = 0; i < count; i++) {
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data->power[i] = regulator_get(dev, data->power_name[i]);
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if (IS_ERR_OR_NULL(data->power[i]))
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return -ENOMEM;
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dev_info(dev, "modem power[%d] (%s)\n", i, data->power_name[i]);
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}
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data->gpio_modem_rst = of_get_named_gpio_flags(np, "modem_rst",
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0, (enum of_gpio_flags *)&config);
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if (!gpio_is_valid(data->gpio_modem_rst)) {
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dev_err(dev, "get gpio modem_rst failed\n");
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} else {
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dev_info(dev, "modem_rst 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_modem_rst, "modem_rst");
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if (ret < 0) {
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dev_err(dev, "can't request modem_rst gpio %d\n",
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data->gpio_modem_rst);
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return ret;
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}
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ret = gpio_direction_output(data->gpio_modem_rst, data->gpio_modem_rst_assert);
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if (ret < 0) {
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dev_err(dev, "can't request output direction modem_rst gpio %d\n",
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data->gpio_modem_rst);
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return ret;
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}
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data->gpio_modem_rst_assert = config.data;
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gpio_set_value(data->gpio_modem_rst, data->gpio_modem_rst_assert);
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}
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data->rfkill = rfkill_alloc("sunxi-modem", dev, RFKILL_TYPE_WWAN,
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&sunxi_modem_rfkill_ops, data);
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if (!data->rfkill) {
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ret = -ENOMEM;
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goto failed_alloc;
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}
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rfkill_set_states(data->rfkill, true, false);
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ret = rfkill_register(data->rfkill);
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if (ret)
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goto fail_rfkill;
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platform_set_drvdata(pdev, data);
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data->power_state = 0;
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modem_data = data;
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return 0;
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fail_rfkill:
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if (data->rfkill)
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rfkill_destroy(data->rfkill);
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failed_alloc:
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modem_data = NULL;
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return ret;
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}
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static int sunxi_modem_remove(struct platform_device *pdev)
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{
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struct sunxi_modem_platdata *data = platform_get_drvdata(pdev);
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struct rfkill *rfk = data->rfkill;
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platform_set_drvdata(pdev, NULL);
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if (rfk) {
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rfkill_unregister(rfk);
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rfkill_destroy(rfk);
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}
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modem_data = NULL;
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return 0;
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}
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static const struct of_device_id sunxi_modem_ids[] = {
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{ .compatible = "allwinner,sunxi-modem" },
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{ /* Sentinel */ }
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};
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static struct platform_driver sunxi_modem_driver = {
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.probe = sunxi_modem_probe,
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.remove = sunxi_modem_remove,
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.driver = {
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.owner = THIS_MODULE,
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.name = "sunxi-modem",
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.of_match_table = sunxi_modem_ids,
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},
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};
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module_platform_driver(sunxi_modem_driver);
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MODULE_DESCRIPTION("sunxi modem rfkill driver");
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MODULE_LICENSE(GPL);
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