228 lines
6.0 KiB
C
228 lines
6.0 KiB
C
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/*
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* Copyright (c) 2011, NVIDIA Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/gpio.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/rfkill.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/slab.h>
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#include <linux/rfkill-gpio.h>
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enum rfkill_gpio_clk_state {
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UNSPECIFIED = 0,
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PWR_ENABLED,
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PWR_DISABLED
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};
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#define PWR_CLK_SET(_RF, _EN) \
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((_RF)->pwr_clk_enabled = (!(_EN) ? PWR_ENABLED : PWR_DISABLED))
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#define PWR_CLK_ENABLED(_RF) ((_RF)->pwr_clk_enabled == PWR_ENABLED)
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#define PWR_CLK_DISABLED(_RF) ((_RF)->pwr_clk_enabled != PWR_ENABLED)
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struct rfkill_gpio_data {
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struct rfkill_gpio_platform_data *pdata;
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struct rfkill *rfkill_dev;
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char *reset_name;
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char *shutdown_name;
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enum rfkill_gpio_clk_state pwr_clk_enabled;
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struct clk *pwr_clk;
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};
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static int rfkill_gpio_set_power(void *data, bool blocked)
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{
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struct rfkill_gpio_data *rfkill = data;
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if (blocked) {
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if (gpio_is_valid(rfkill->pdata->shutdown_gpio))
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gpio_direction_output(rfkill->pdata->shutdown_gpio, 0);
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if (gpio_is_valid(rfkill->pdata->reset_gpio))
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gpio_direction_output(rfkill->pdata->reset_gpio, 0);
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if (rfkill->pwr_clk && PWR_CLK_ENABLED(rfkill))
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clk_disable(rfkill->pwr_clk);
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} else {
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if (rfkill->pwr_clk && PWR_CLK_DISABLED(rfkill))
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clk_enable(rfkill->pwr_clk);
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if (gpio_is_valid(rfkill->pdata->reset_gpio))
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gpio_direction_output(rfkill->pdata->reset_gpio, 1);
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if (gpio_is_valid(rfkill->pdata->shutdown_gpio))
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gpio_direction_output(rfkill->pdata->shutdown_gpio, 1);
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}
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if (rfkill->pwr_clk)
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PWR_CLK_SET(rfkill, blocked);
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return 0;
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}
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static const struct rfkill_ops rfkill_gpio_ops = {
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.set_block = rfkill_gpio_set_power,
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};
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static int rfkill_gpio_probe(struct platform_device *pdev)
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{
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struct rfkill_gpio_data *rfkill;
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struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
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int ret = 0;
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int len = 0;
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if (!pdata) {
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pr_warn("%s: No platform data specified\n", __func__);
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return -EINVAL;
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}
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/* make sure at-least one of the GPIO is defined and that
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* a name is specified for this instance */
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if (!pdata->name || (!gpio_is_valid(pdata->reset_gpio) &&
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!gpio_is_valid(pdata->shutdown_gpio))) {
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pr_warn("%s: invalid platform data\n", __func__);
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return -EINVAL;
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}
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rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL);
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if (!rfkill)
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return -ENOMEM;
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if (pdata->gpio_runtime_setup) {
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ret = pdata->gpio_runtime_setup(pdev);
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if (ret) {
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pr_warn("%s: can't set up gpio\n", __func__);
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goto fail_alloc;
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}
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}
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rfkill->pdata = pdata;
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len = strlen(pdata->name);
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rfkill->reset_name = kzalloc(len + 7, GFP_KERNEL);
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if (!rfkill->reset_name) {
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ret = -ENOMEM;
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goto fail_alloc;
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}
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rfkill->shutdown_name = kzalloc(len + 10, GFP_KERNEL);
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if (!rfkill->shutdown_name) {
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ret = -ENOMEM;
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goto fail_reset_name;
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}
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snprintf(rfkill->reset_name, len + 6 , "%s_reset", pdata->name);
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snprintf(rfkill->shutdown_name, len + 9, "%s_shutdown", pdata->name);
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if (pdata->power_clk_name) {
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rfkill->pwr_clk = clk_get(&pdev->dev, pdata->power_clk_name);
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if (IS_ERR(rfkill->pwr_clk)) {
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pr_warn("%s: can't find pwr_clk.\n", __func__);
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goto fail_shutdown_name;
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}
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}
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if (gpio_is_valid(pdata->reset_gpio)) {
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ret = gpio_request(pdata->reset_gpio, rfkill->reset_name);
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if (ret) {
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pr_warn("%s: failed to get reset gpio.\n", __func__);
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goto fail_clock;
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}
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}
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if (gpio_is_valid(pdata->shutdown_gpio)) {
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ret = gpio_request(pdata->shutdown_gpio, rfkill->shutdown_name);
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if (ret) {
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pr_warn("%s: failed to get shutdown gpio.\n", __func__);
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goto fail_reset;
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}
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}
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rfkill->rfkill_dev = rfkill_alloc(pdata->name, &pdev->dev, pdata->type,
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&rfkill_gpio_ops, rfkill);
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if (!rfkill->rfkill_dev)
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goto fail_shutdown;
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ret = rfkill_register(rfkill->rfkill_dev);
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if (ret < 0)
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goto fail_rfkill;
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platform_set_drvdata(pdev, rfkill);
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dev_info(&pdev->dev, "%s device registered.\n", pdata->name);
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return 0;
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fail_rfkill:
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rfkill_destroy(rfkill->rfkill_dev);
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fail_shutdown:
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if (gpio_is_valid(pdata->shutdown_gpio))
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gpio_free(pdata->shutdown_gpio);
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fail_reset:
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if (gpio_is_valid(pdata->reset_gpio))
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gpio_free(pdata->reset_gpio);
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fail_clock:
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if (rfkill->pwr_clk)
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clk_put(rfkill->pwr_clk);
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fail_shutdown_name:
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kfree(rfkill->shutdown_name);
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fail_reset_name:
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kfree(rfkill->reset_name);
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fail_alloc:
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kfree(rfkill);
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return ret;
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}
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static int rfkill_gpio_remove(struct platform_device *pdev)
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{
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struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
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struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
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if (pdata->gpio_runtime_close)
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pdata->gpio_runtime_close(pdev);
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rfkill_unregister(rfkill->rfkill_dev);
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rfkill_destroy(rfkill->rfkill_dev);
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if (gpio_is_valid(rfkill->pdata->shutdown_gpio))
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gpio_free(rfkill->pdata->shutdown_gpio);
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if (gpio_is_valid(rfkill->pdata->reset_gpio))
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gpio_free(rfkill->pdata->reset_gpio);
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if (rfkill->pwr_clk && PWR_CLK_ENABLED(rfkill))
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clk_disable(rfkill->pwr_clk);
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if (rfkill->pwr_clk)
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clk_put(rfkill->pwr_clk);
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kfree(rfkill->shutdown_name);
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kfree(rfkill->reset_name);
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kfree(rfkill);
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return 0;
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}
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static struct platform_driver rfkill_gpio_driver = {
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.probe = rfkill_gpio_probe,
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.remove = __devexit_p(rfkill_gpio_remove),
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.driver = {
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.name = "rfkill_gpio",
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(rfkill_gpio_driver);
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MODULE_DESCRIPTION("gpio rfkill");
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MODULE_AUTHOR("NVIDIA");
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MODULE_LICENSE("GPL");
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