cregit-Linux how code gets into the kernel

Release 4.11 drivers/input/rmi4/rmi_f55.c

/*
 * Copyright (c) 2012-2015 Synaptics Incorporated
 * Copyright (C) 2016 Zodiac Inflight Innovations
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/rmi.h>
#include <linux/slab.h>
#include "rmi_driver.h"


#define F55_NAME		"rmi4_f55"

/* F55 data offsets */

#define F55_NUM_RX_OFFSET	0

#define F55_NUM_TX_OFFSET	1

#define F55_PHYS_CHAR_OFFSET	2

/* Only read required query registers */

#define F55_QUERY_LEN		3

/* F55 capabilities */

#define F55_CAP_SENSOR_ASSIGN	BIT(0)


struct f55_data {
	
struct rmi_function *fn;

	
u8 qry[F55_QUERY_LEN];
	
u8 num_rx_electrodes;
	
u8 cfg_num_rx_electrodes;
	
u8 num_tx_electrodes;
	
u8 cfg_num_tx_electrodes;
};


static int rmi_f55_detect(struct rmi_function *fn) { struct rmi_device *rmi_dev = fn->rmi_dev; struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev); struct f55_data *f55; int error; f55 = dev_get_drvdata(&fn->dev); error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr, &f55->qry, sizeof(f55->qry)); if (error) { dev_err(&fn->dev, "%s: Failed to query F55 properties\n", __func__); return error; } f55->num_rx_electrodes = f55->qry[F55_NUM_RX_OFFSET]; f55->num_tx_electrodes = f55->qry[F55_NUM_TX_OFFSET]; f55->cfg_num_rx_electrodes = f55->num_rx_electrodes; f55->cfg_num_tx_electrodes = f55->num_rx_electrodes; drv_data->num_rx_electrodes = f55->cfg_num_rx_electrodes; drv_data->num_tx_electrodes = f55->cfg_num_rx_electrodes; if (f55->qry[F55_PHYS_CHAR_OFFSET] & F55_CAP_SENSOR_ASSIGN) { int i, total; u8 buf[256]; /* * Calculate the number of enabled receive and transmit * electrodes by reading F55:Ctrl1 (sensor receiver assignment) * and F55:Ctrl2 (sensor transmitter assignment). The number of * enabled electrodes is the sum of all field entries with a * value other than 0xff. */ error = rmi_read_block(fn->rmi_dev, fn->fd.control_base_addr + 1, buf, f55->num_rx_electrodes); if (!error) { total = 0; for (i = 0; i < f55->num_rx_electrodes; i++) { if (buf[i] != 0xff) total++; } f55->cfg_num_rx_electrodes = total; drv_data->num_rx_electrodes = total; } error = rmi_read_block(fn->rmi_dev, fn->fd.control_base_addr + 2, buf, f55->num_tx_electrodes); if (!error) { total = 0; for (i = 0; i < f55->num_tx_electrodes; i++) { if (buf[i] != 0xff) total++; } f55->cfg_num_tx_electrodes = total; drv_data->num_tx_electrodes = total; } } rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F55 num_rx_electrodes: %d (raw %d)\n", f55->cfg_num_rx_electrodes, f55->num_rx_electrodes); rmi_dbg(RMI_DEBUG_FN, &fn->dev, "F55 num_tx_electrodes: %d (raw %d)\n", f55->cfg_num_tx_electrodes, f55->num_tx_electrodes); return 0; }

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static int rmi_f55_probe(struct rmi_function *fn) { struct f55_data *f55; f55 = devm_kzalloc(&fn->dev, sizeof(struct f55_data), GFP_KERNEL); if (!f55) return -ENOMEM; f55->fn = fn; dev_set_drvdata(&fn->dev, f55); return rmi_f55_detect(fn); }

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struct rmi_function_handler rmi_f55_handler = { .driver = { .name = F55_NAME, }, .func = 0x55, .probe = rmi_f55_probe, };

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