// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2012-2015 Synaptics Incorporated
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* Copyright (C) 2016 Zodiac Inflight Innovations
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*/
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#include <linux/bitops.h>
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#include <linux/kernel.h>
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#include <linux/rmi.h>
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#include <linux/slab.h>
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#include "rmi_driver.h"
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#define F55_NAME "rmi4_f55"
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/* F55 data offsets */
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#define F55_NUM_RX_OFFSET 0
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#define F55_NUM_TX_OFFSET 1
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#define F55_PHYS_CHAR_OFFSET 2
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/* Only read required query registers */
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#define F55_QUERY_LEN 3
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/* F55 capabilities */
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#define F55_CAP_SENSOR_ASSIGN BIT(0)
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struct f55_data {
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struct rmi_function *fn;
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u8 qry[F55_QUERY_LEN];
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u8 num_rx_electrodes;
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u8 cfg_num_rx_electrodes;
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u8 num_tx_electrodes;
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u8 cfg_num_tx_electrodes;
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};
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static int rmi_f55_detect(struct rmi_function *fn)
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{
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struct rmi_device *rmi_dev = fn->rmi_dev;
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struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev);
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struct f55_data *f55;
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int error;
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f55 = dev_get_drvdata(&fn->dev);
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error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr,
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&f55->qry, sizeof(f55->qry));
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if (error) {
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dev_err(&fn->dev, "%s: Failed to query F55 properties\n",
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__func__);
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return error;
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}
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f55->num_rx_electrodes = f55->qry[F55_NUM_RX_OFFSET];
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f55->num_tx_electrodes = f55->qry[F55_NUM_TX_OFFSET];
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f55->cfg_num_rx_electrodes = f55->num_rx_electrodes;
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f55->cfg_num_tx_electrodes = f55->num_rx_electrodes;
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drv_data->num_rx_electrodes = f55->cfg_num_rx_electrodes;
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drv_data->num_tx_electrodes = f55->cfg_num_rx_electrodes;
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if (f55->qry[F55_PHYS_CHAR_OFFSET] & F55_CAP_SENSOR_ASSIGN) {
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int i, total;
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u8 buf[256];
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/*
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* Calculate the number of enabled receive and transmit
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* electrodes by reading F55:Ctrl1 (sensor receiver assignment)
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* and F55:Ctrl2 (sensor transmitter assignment). The number of
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* enabled electrodes is the sum of all field entries with a
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* value other than 0xff.
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*/
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error = rmi_read_block(fn->rmi_dev,
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fn->fd.control_base_addr + 1,
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buf, f55->num_rx_electrodes);
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if (!error) {
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total = 0;
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for (i = 0; i < f55->num_rx_electrodes; i++) {
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if (buf[i] != 0xff)
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total++;
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}
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f55->cfg_num_rx_electrodes = total;
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drv_data->num_rx_electrodes = total;
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}
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error = rmi_read_block(fn->rmi_dev,
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fn->fd.control_base_addr + 2,
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buf, f55->num_tx_electrodes);
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if (!error) {
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total = 0;
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for (i = 0; i < f55->num_tx_electrodes; i++) {
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if (buf[i] != 0xff)
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total++;
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}
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f55->cfg_num_tx_electrodes = total;
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drv_data->num_tx_electrodes = total;
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}
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}
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rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F55 num_rx_electrodes: %d (raw %d)\n",
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f55->cfg_num_rx_electrodes, f55->num_rx_electrodes);
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rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F55 num_tx_electrodes: %d (raw %d)\n",
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f55->cfg_num_tx_electrodes, f55->num_tx_electrodes);
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return 0;
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}
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static int rmi_f55_probe(struct rmi_function *fn)
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{
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struct f55_data *f55;
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f55 = devm_kzalloc(&fn->dev, sizeof(struct f55_data), GFP_KERNEL);
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if (!f55)
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return -ENOMEM;
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f55->fn = fn;
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dev_set_drvdata(&fn->dev, f55);
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return rmi_f55_detect(fn);
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}
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struct rmi_function_handler rmi_f55_handler = {
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.driver = {
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.name = F55_NAME,
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},
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.func = 0x55,
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.probe = rmi_f55_probe,
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};
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