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ab45e1f40b
The .remove() callback for a platform driver returns an int which makes many driver authors wrongly assume it's possible to do error handling by returning an error code. However the value returned is ignored (apart from emitting a warning) and this typically results in resource leaks. To improve here there is a quest to make the remove callback return void. In the first step of this quest all drivers are converted to .remove_new(), which already returns void. Eventually after all drivers are converted, .remove_new() will be renamed to .remove(). Trivially convert this driver from always returning zero in the remove callback to the void returning variant. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/e2ea8abb4c30190392a86cf05cecd722d0f0b493.1703693980.git.u.kleine-koenig@pengutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
143 lines
3.4 KiB
C
143 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2022 MediaTek Corporation. All rights reserved.
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* Author: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
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*/
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#include <linux/firmware/mediatek/mtk-adsp-ipc.h>
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#include <linux/kernel.h>
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#include <linux/mailbox_client.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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static const char * const adsp_mbox_ch_names[MTK_ADSP_MBOX_NUM] = { "rx", "tx" };
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/*
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* mtk_adsp_ipc_send - send ipc cmd to MTK ADSP
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*
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* @ipc: ADSP IPC handle
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* @idx: index of the mailbox channel
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* @msg: IPC cmd (reply or request)
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*
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* Returns zero for success from mbox_send_message
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* negative value for error
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*/
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int mtk_adsp_ipc_send(struct mtk_adsp_ipc *ipc, unsigned int idx, uint32_t msg)
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{
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struct mtk_adsp_chan *adsp_chan;
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int ret;
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if (idx >= MTK_ADSP_MBOX_NUM)
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return -EINVAL;
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adsp_chan = &ipc->chans[idx];
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ret = mbox_send_message(adsp_chan->ch, &msg);
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if (ret < 0)
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return ret;
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return 0;
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}
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EXPORT_SYMBOL_GPL(mtk_adsp_ipc_send);
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/*
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* mtk_adsp_ipc_recv - recv callback used by MTK ADSP mailbox
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*
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* @c: mbox client
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* @msg: message received
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*
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* Users of ADSP IPC will need to privde handle_reply and handle_request
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* callbacks.
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*/
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static void mtk_adsp_ipc_recv(struct mbox_client *c, void *msg)
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{
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struct mtk_adsp_chan *chan = container_of(c, struct mtk_adsp_chan, cl);
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struct device *dev = c->dev;
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switch (chan->idx) {
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case MTK_ADSP_MBOX_REPLY:
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chan->ipc->ops->handle_reply(chan->ipc);
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break;
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case MTK_ADSP_MBOX_REQUEST:
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chan->ipc->ops->handle_request(chan->ipc);
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break;
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default:
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dev_err(dev, "wrong mbox chan %d\n", chan->idx);
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break;
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}
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}
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static int mtk_adsp_ipc_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct mtk_adsp_ipc *adsp_ipc;
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struct mtk_adsp_chan *adsp_chan;
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struct mbox_client *cl;
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int ret;
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int i, j;
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device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
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adsp_ipc = devm_kzalloc(dev, sizeof(*adsp_ipc), GFP_KERNEL);
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if (!adsp_ipc)
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return -ENOMEM;
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for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
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adsp_chan = &adsp_ipc->chans[i];
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cl = &adsp_chan->cl;
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cl->dev = dev->parent;
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cl->tx_block = false;
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cl->knows_txdone = false;
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cl->tx_prepare = NULL;
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cl->rx_callback = mtk_adsp_ipc_recv;
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adsp_chan->ipc = adsp_ipc;
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adsp_chan->idx = i;
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adsp_chan->ch = mbox_request_channel_byname(cl, adsp_mbox_ch_names[i]);
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if (IS_ERR(adsp_chan->ch)) {
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ret = PTR_ERR(adsp_chan->ch);
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if (ret != -EPROBE_DEFER)
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dev_err(dev, "Failed to request mbox chan %s ret %d\n",
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adsp_mbox_ch_names[i], ret);
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for (j = 0; j < i; j++) {
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adsp_chan = &adsp_ipc->chans[j];
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mbox_free_channel(adsp_chan->ch);
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}
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return ret;
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}
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}
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adsp_ipc->dev = dev;
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dev_set_drvdata(dev, adsp_ipc);
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dev_dbg(dev, "MTK ADSP IPC initialized\n");
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return 0;
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}
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static void mtk_adsp_ipc_remove(struct platform_device *pdev)
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{
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struct mtk_adsp_ipc *adsp_ipc = dev_get_drvdata(&pdev->dev);
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struct mtk_adsp_chan *adsp_chan;
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int i;
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for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
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adsp_chan = &adsp_ipc->chans[i];
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mbox_free_channel(adsp_chan->ch);
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}
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}
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static struct platform_driver mtk_adsp_ipc_driver = {
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.driver = {
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.name = "mtk-adsp-ipc",
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},
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.probe = mtk_adsp_ipc_probe,
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.remove_new = mtk_adsp_ipc_remove,
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};
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builtin_platform_driver(mtk_adsp_ipc_driver);
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MODULE_AUTHOR("Allen-KH Cheng <allen-kh.cheng@mediatek.com>");
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MODULE_DESCRIPTION("MTK ADSP IPC Driver");
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MODULE_LICENSE("GPL");
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