653 lines
15 KiB
C
653 lines
15 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2019 MediaTek Inc.
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*/
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#include <linux/spi/spi.h>
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#include <linux/of_gpio.h>
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#include "synaptics_tcm_core.h"
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static unsigned char *buf;
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static unsigned int buf_size;
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static struct spi_transfer *xfer;
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static struct syna_tcm_bus_io bus_io;
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static struct syna_tcm_hw_interface hw_if;
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static struct platform_device *syna_tcm_spi_device;
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#ifdef CONFIG_OF
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static int parse_dt(struct device *dev, struct syna_tcm_board_data *bdata)
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{
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int retval;
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u32 value;
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struct property *prop;
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struct device_node *np = dev->of_node;
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const char *name;
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prop = of_find_property(np, "synaptics,irq-gpio", NULL);
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if (prop && prop->length) {
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bdata->irq_gpio = of_get_named_gpio_flags(np,
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"synaptics,irq-gpio", 0,
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(enum of_gpio_flags *)&bdata->irq_flags);
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} else {
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bdata->irq_gpio = -1;
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}
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retval = of_property_read_u32(np, "synaptics,irq-on-state", &value);
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if (retval < 0)
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bdata->irq_on_state = 0;
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else
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bdata->irq_on_state = value;
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retval = of_property_read_string(np, "synaptics,pwr-reg-name", &name);
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if (retval < 0)
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bdata->pwr_reg_name = NULL;
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else
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bdata->pwr_reg_name = name;
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retval = of_property_read_string(np, "synaptics,bus-reg-name", &name);
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if (retval < 0)
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bdata->bus_reg_name = NULL;
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else
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bdata->bus_reg_name = name;
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prop = of_find_property(np, "synaptics,power-gpio", NULL);
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if (prop && prop->length) {
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bdata->power_gpio = of_get_named_gpio_flags(np,
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"synaptics,power-gpio", 0, NULL);
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} else {
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bdata->power_gpio = -1;
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}
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prop = of_find_property(np, "synaptics,power-on-state", NULL);
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if (prop && prop->length) {
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retval = of_property_read_u32(np, "synaptics,power-on-state",
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&value);
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if (retval < 0) {
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LOG_ERR(dev,
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"Failed to read synaptics,power-on-state property\n");
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return retval;
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}
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bdata->power_on_state = value;
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} else {
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bdata->power_on_state = 0;
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}
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prop = of_find_property(np, "synaptics,power-delay-ms", NULL);
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if (prop && prop->length) {
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retval = of_property_read_u32(np, "synaptics,power-delay-ms",
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&value);
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if (retval < 0) {
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LOG_ERR(dev,
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"Failed to read synaptics,power-delay-ms property\n");
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return retval;
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}
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bdata->power_delay_ms = value;
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} else {
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bdata->power_delay_ms = 0;
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}
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prop = of_find_property(np, "synaptics,reset-gpio", NULL);
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if (prop && prop->length) {
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bdata->reset_gpio = of_get_named_gpio_flags(np,
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"synaptics,reset-gpio", 0, NULL);
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} else {
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bdata->reset_gpio = -1;
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}
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prop = of_find_property(np, "synaptics,reset-on-state", NULL);
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if (prop && prop->length) {
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retval = of_property_read_u32(np, "synaptics,reset-on-state",
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&value);
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if (retval < 0) {
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LOG_ERR(dev,
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"Failed to read synaptics,reset-on-state property\n");
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return retval;
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}
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bdata->reset_on_state = value;
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} else {
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bdata->reset_on_state = 0;
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}
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prop = of_find_property(np, "synaptics,reset-active-ms", NULL);
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if (prop && prop->length) {
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retval = of_property_read_u32(np, "synaptics,reset-active-ms",
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&value);
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if (retval < 0) {
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LOG_ERR(dev,
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"Failed to read synaptics,reset-active-ms property\n");
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return retval;
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}
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bdata->reset_active_ms = value;
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} else {
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bdata->reset_active_ms = 0;
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}
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prop = of_find_property(np, "synaptics,reset-delay-ms", NULL);
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if (prop && prop->length) {
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retval = of_property_read_u32(np, "synaptics,reset-delay-ms",
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&value);
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if (retval < 0) {
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LOG_ERR(dev,
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"Unable to read synaptics,reset-delay-ms property\n");
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return retval;
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}
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bdata->reset_delay_ms = value;
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} else {
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bdata->reset_delay_ms = 0;
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}
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prop = of_find_property(np, "synaptics,x-flip", NULL);
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bdata->x_flip = prop > 0 ? true : false;
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bdata->x_flip = true;
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prop = of_find_property(np, "synaptics,y-flip", NULL);
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bdata->y_flip = prop > 0 ? true : false;
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bdata->y_flip = true;
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prop = of_find_property(np, "synaptics,swap-axes", NULL);
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bdata->swap_axes = prop > 0 ? true : false;
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prop = of_find_property(np, "synaptics,byte-delay-us", NULL);
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if (prop && prop->length) {
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retval = of_property_read_u32(np, "synaptics,byte-delay-us",
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&value);
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if (retval < 0) {
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LOG_ERR(dev,
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"Unable to read synaptics,byte-delay-us property\n");
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return retval;
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}
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bdata->byte_delay_us = value;
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} else {
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bdata->byte_delay_us = 0;
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}
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prop = of_find_property(np, "synaptics,block-delay-us", NULL);
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if (prop && prop->length) {
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retval = of_property_read_u32(np, "synaptics,block-delay-us",
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&value);
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if (retval < 0) {
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LOG_ERR(dev,
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"Unable to read synaptics,block-delay-us property\n");
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return retval;
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}
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bdata->block_delay_us = value;
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} else {
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bdata->block_delay_us = 0;
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}
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prop = of_find_property(np, "synaptics,spi-mode", NULL);
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if (prop && prop->length) {
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retval = of_property_read_u32(np, "synaptics,spi-mode",
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&value);
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if (retval < 0) {
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LOG_ERR(dev,
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"Unable to read synaptics,spi-mode property\n");
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return retval;
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}
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bdata->spi_mode = value;
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} else {
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bdata->spi_mode = 0;
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}
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prop = of_find_property(np, "synaptics,ubl-max-freq", NULL);
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if (prop && prop->length) {
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retval = of_property_read_u32(np, "synaptics,ubl-max-freq",
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&value);
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if (retval < 0) {
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LOG_ERR(dev,
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"Unable to read synaptics,ubl-max-freq property\n");
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return retval;
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}
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bdata->ubl_max_freq = value;
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} else {
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bdata->ubl_max_freq = 0;
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}
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prop = of_find_property(np, "synaptics,ubl-byte-delay-us", NULL);
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if (prop && prop->length) {
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retval = of_property_read_u32(np, "synaptics,ubl-byte-delay-us",
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&value);
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if (retval < 0) {
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LOG_ERR(dev,
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"Unable to read synaptics,ubl-byte-delay-us property\n");
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return retval;
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}
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bdata->ubl_byte_delay_us = value;
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} else {
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bdata->ubl_byte_delay_us = 0;
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}
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return 0;
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}
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#endif
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static int syna_tcm_spi_alloc_mem(struct syna_tcm_hcd *tcm_hcd,
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unsigned int count, unsigned int size)
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{
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static unsigned int xfer_count;
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struct spi_device *spi = to_spi_device(tcm_hcd->pdev->dev.parent);
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if (count > xfer_count) {
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kfree(xfer);
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xfer = kcalloc(count, sizeof(*xfer), GFP_KERNEL);
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if (!xfer) {
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LOG_ERR(&spi->dev,
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"Failed to allocate memory for xfer\n");
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xfer_count = 0;
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return -ENOMEM;
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}
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xfer_count = count;
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} else {
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memset(xfer, 0, count * sizeof(*xfer));
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}
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if (size > buf_size) {
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if (buf_size)
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kfree(buf);
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buf = kmalloc(size, GFP_KERNEL);
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if (!buf) {
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LOG_ERR(&spi->dev,
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"Failed to allocate memory for buf\n");
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buf_size = 0;
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return -ENOMEM;
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}
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buf_size = size;
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}
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return 0;
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}
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static int syna_tcm_spi_rmi_read(struct syna_tcm_hcd *tcm_hcd,
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unsigned short addr, unsigned char *data, unsigned int length)
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{
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int retval;
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unsigned int idx;
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unsigned int mode;
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unsigned int byte_count;
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struct spi_message msg;
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struct spi_device *spi = to_spi_device(tcm_hcd->pdev->dev.parent);
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const struct syna_tcm_board_data *bdata = tcm_hcd->hw_if->bdata;
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mutex_lock(&tcm_hcd->io_ctrl_mutex);
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spi_message_init(&msg);
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byte_count = length + 2;
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if (bdata->ubl_byte_delay_us == 0)
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retval = syna_tcm_spi_alloc_mem(tcm_hcd, 2, byte_count);
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else
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retval = syna_tcm_spi_alloc_mem(tcm_hcd, byte_count, 3);
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if (retval < 0) {
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LOG_ERR(&spi->dev,
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"Failed to allocate memory\n");
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goto exit;
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}
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buf[0] = (unsigned char)(addr >> 8) | 0x80;
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buf[1] = (unsigned char)addr;
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if (bdata->ubl_byte_delay_us == 0) {
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xfer[0].len = 2;
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xfer[0].tx_buf = buf;
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xfer[0].speed_hz = bdata->ubl_max_freq;
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spi_message_add_tail(&xfer[0], &msg);
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memset(&buf[2], 0xff, length);
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xfer[1].len = length;
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xfer[1].tx_buf = &buf[2];
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xfer[1].rx_buf = data;
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if (bdata->block_delay_us)
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xfer[1].delay_usecs = bdata->block_delay_us;
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xfer[1].speed_hz = bdata->ubl_max_freq;
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spi_message_add_tail(&xfer[1], &msg);
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} else {
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buf[2] = 0xff;
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for (idx = 0; idx < byte_count; idx++) {
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xfer[idx].len = 1;
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if (idx < 2) {
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xfer[idx].tx_buf = &buf[idx];
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} else {
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xfer[idx].tx_buf = &buf[2];
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xfer[idx].rx_buf = &data[idx - 2];
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}
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xfer[idx].delay_usecs = bdata->ubl_byte_delay_us;
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if (bdata->block_delay_us && (idx == byte_count - 1))
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xfer[idx].delay_usecs = bdata->block_delay_us;
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xfer[idx].speed_hz = bdata->ubl_max_freq;
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spi_message_add_tail(&xfer[idx], &msg);
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}
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}
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mode = spi->mode;
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spi->mode = SPI_MODE_3;
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retval = spi_sync(spi, &msg);
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if (retval == 0) {
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retval = length;
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} else {
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LOG_ERR(&spi->dev,
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"Failed to complete SPI transfer, error = %d\n",
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retval);
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}
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spi->mode = mode;
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exit:
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mutex_unlock(&tcm_hcd->io_ctrl_mutex);
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return retval;
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}
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static int syna_tcm_spi_rmi_write(struct syna_tcm_hcd *tcm_hcd,
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unsigned short addr, unsigned char *data, unsigned int length)
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{
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int retval;
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unsigned int mode;
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unsigned int byte_count;
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struct spi_message msg;
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struct spi_device *spi = to_spi_device(tcm_hcd->pdev->dev.parent);
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const struct syna_tcm_board_data *bdata = tcm_hcd->hw_if->bdata;
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mutex_lock(&tcm_hcd->io_ctrl_mutex);
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spi_message_init(&msg);
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byte_count = length + 2;
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retval = syna_tcm_spi_alloc_mem(tcm_hcd, 1, byte_count);
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if (retval < 0) {
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LOG_ERR(&spi->dev,
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"Failed to allocate memory\n");
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goto exit;
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|
|
}
|
||
|
|
|
||
|
|
buf[0] = (unsigned char)(addr >> 8) & ~0x80;
|
||
|
|
buf[1] = (unsigned char)addr;
|
||
|
|
retval = secure_memcpy(&buf[2],
|
||
|
|
buf_size - 2,
|
||
|
|
data,
|
||
|
|
length,
|
||
|
|
length);
|
||
|
|
if (retval < 0) {
|
||
|
|
LOG_ERR(&spi->dev,
|
||
|
|
"Failed to copy write data\n");
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
xfer[0].len = byte_count;
|
||
|
|
xfer[0].tx_buf = buf;
|
||
|
|
if (bdata->block_delay_us)
|
||
|
|
xfer[0].delay_usecs = bdata->block_delay_us;
|
||
|
|
spi_message_add_tail(&xfer[0], &msg);
|
||
|
|
|
||
|
|
mode = spi->mode;
|
||
|
|
spi->mode = SPI_MODE_3;
|
||
|
|
|
||
|
|
retval = spi_sync(spi, &msg);
|
||
|
|
if (retval == 0) {
|
||
|
|
retval = length;
|
||
|
|
} else {
|
||
|
|
LOG_ERR(&spi->dev,
|
||
|
|
"Failed to complete SPI transfer, error = %d\n",
|
||
|
|
retval);
|
||
|
|
}
|
||
|
|
|
||
|
|
spi->mode = mode;
|
||
|
|
|
||
|
|
exit:
|
||
|
|
mutex_unlock(&tcm_hcd->io_ctrl_mutex);
|
||
|
|
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int syna_tcm_spi_read(struct syna_tcm_hcd *tcm_hcd, unsigned char *data,
|
||
|
|
unsigned int length)
|
||
|
|
{
|
||
|
|
int retval;
|
||
|
|
unsigned int idx;
|
||
|
|
struct spi_message msg;
|
||
|
|
struct spi_device *spi = to_spi_device(tcm_hcd->pdev->dev.parent);
|
||
|
|
const struct syna_tcm_board_data *bdata = tcm_hcd->hw_if->bdata;
|
||
|
|
|
||
|
|
mutex_lock(&tcm_hcd->io_ctrl_mutex);
|
||
|
|
|
||
|
|
spi_message_init(&msg);
|
||
|
|
|
||
|
|
if (bdata->byte_delay_us == 0)
|
||
|
|
retval = syna_tcm_spi_alloc_mem(tcm_hcd, 1, length);
|
||
|
|
else
|
||
|
|
retval = syna_tcm_spi_alloc_mem(tcm_hcd, length, 1);
|
||
|
|
if (retval < 0) {
|
||
|
|
LOG_ERR(tcm_hcd->pdev->dev.parent,
|
||
|
|
"Failed to allocate memory\n");
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (bdata->byte_delay_us == 0) {
|
||
|
|
memset(buf, 0xff, length);
|
||
|
|
xfer[0].len = length;
|
||
|
|
xfer[0].tx_buf = buf;
|
||
|
|
xfer[0].rx_buf = data;
|
||
|
|
if (bdata->block_delay_us)
|
||
|
|
xfer[0].delay_usecs = bdata->block_delay_us;
|
||
|
|
spi_message_add_tail(&xfer[0], &msg);
|
||
|
|
} else {
|
||
|
|
buf[0] = 0xff;
|
||
|
|
for (idx = 0; idx < length; idx++) {
|
||
|
|
xfer[idx].len = 1;
|
||
|
|
xfer[idx].tx_buf = buf;
|
||
|
|
xfer[idx].rx_buf = &data[idx];
|
||
|
|
xfer[idx].delay_usecs = bdata->byte_delay_us;
|
||
|
|
if (bdata->block_delay_us && (idx == length - 1))
|
||
|
|
xfer[idx].delay_usecs = bdata->block_delay_us;
|
||
|
|
spi_message_add_tail(&xfer[idx], &msg);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
retval = spi_sync(spi, &msg);
|
||
|
|
if (retval == 0) {
|
||
|
|
retval = length;
|
||
|
|
} else {
|
||
|
|
LOG_ERR(&spi->dev,
|
||
|
|
"Failed to complete SPI transfer, error = %d\n",
|
||
|
|
retval);
|
||
|
|
}
|
||
|
|
|
||
|
|
exit:
|
||
|
|
mutex_unlock(&tcm_hcd->io_ctrl_mutex);
|
||
|
|
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int syna_tcm_spi_write(struct syna_tcm_hcd *tcm_hcd, unsigned char *data,
|
||
|
|
unsigned int length)
|
||
|
|
{
|
||
|
|
int retval;
|
||
|
|
unsigned int idx;
|
||
|
|
struct spi_message msg;
|
||
|
|
struct spi_device *spi = to_spi_device(tcm_hcd->pdev->dev.parent);
|
||
|
|
const struct syna_tcm_board_data *bdata = tcm_hcd->hw_if->bdata;
|
||
|
|
|
||
|
|
mutex_lock(&tcm_hcd->io_ctrl_mutex);
|
||
|
|
|
||
|
|
spi_message_init(&msg);
|
||
|
|
|
||
|
|
if (bdata->byte_delay_us == 0)
|
||
|
|
retval = syna_tcm_spi_alloc_mem(tcm_hcd, 1, 0);
|
||
|
|
else
|
||
|
|
retval = syna_tcm_spi_alloc_mem(tcm_hcd, length, 0);
|
||
|
|
if (retval < 0) {
|
||
|
|
LOG_ERR(&spi->dev,
|
||
|
|
"Failed to allocate memory\n");
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (bdata->byte_delay_us == 0) {
|
||
|
|
xfer[0].len = length;
|
||
|
|
xfer[0].tx_buf = data;
|
||
|
|
if (bdata->block_delay_us)
|
||
|
|
xfer[0].delay_usecs = bdata->block_delay_us;
|
||
|
|
spi_message_add_tail(&xfer[0], &msg);
|
||
|
|
} else {
|
||
|
|
for (idx = 0; idx < length; idx++) {
|
||
|
|
xfer[idx].len = 1;
|
||
|
|
xfer[idx].tx_buf = &data[idx];
|
||
|
|
xfer[idx].delay_usecs = bdata->byte_delay_us;
|
||
|
|
if (bdata->block_delay_us && (idx == length - 1))
|
||
|
|
xfer[idx].delay_usecs = bdata->block_delay_us;
|
||
|
|
spi_message_add_tail(&xfer[idx], &msg);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
retval = spi_sync(spi, &msg);
|
||
|
|
if (retval == 0) {
|
||
|
|
retval = length;
|
||
|
|
} else {
|
||
|
|
LOG_ERR(&spi->dev,
|
||
|
|
"Failed to complete SPI transfer, error = %d\n",
|
||
|
|
retval);
|
||
|
|
}
|
||
|
|
|
||
|
|
exit:
|
||
|
|
mutex_unlock(&tcm_hcd->io_ctrl_mutex);
|
||
|
|
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int syna_tcm_spi_probe(struct spi_device *spi)
|
||
|
|
{
|
||
|
|
int retval;
|
||
|
|
|
||
|
|
if (spi->master->flags & SPI_MASTER_HALF_DUPLEX) {
|
||
|
|
LOG_ERR(&spi->dev,
|
||
|
|
"Full duplex not supported by host\n");
|
||
|
|
return -EIO;
|
||
|
|
}
|
||
|
|
|
||
|
|
syna_tcm_spi_device = platform_device_alloc(PLATFORM_DRIVER_NAME, 0);
|
||
|
|
if (!syna_tcm_spi_device) {
|
||
|
|
LOG_ERR(&spi->dev,
|
||
|
|
"Failed to allocate platform device\n");
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef CONFIG_OF
|
||
|
|
hw_if.bdata = devm_kzalloc(&spi->dev, sizeof(*hw_if.bdata), GFP_KERNEL);
|
||
|
|
if (!hw_if.bdata) {
|
||
|
|
LOG_ERR(&spi->dev,
|
||
|
|
"Failed to allocate memory for board data\n");
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
parse_dt(&spi->dev, hw_if.bdata);
|
||
|
|
#else
|
||
|
|
hw_if.bdata = spi->dev.platform_data;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
switch (hw_if.bdata->spi_mode) {
|
||
|
|
case 0:
|
||
|
|
spi->mode = SPI_MODE_0;
|
||
|
|
break;
|
||
|
|
case 1:
|
||
|
|
spi->mode = SPI_MODE_1;
|
||
|
|
break;
|
||
|
|
case 2:
|
||
|
|
spi->mode = SPI_MODE_2;
|
||
|
|
break;
|
||
|
|
case 3:
|
||
|
|
spi->mode = SPI_MODE_3;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
bus_io.type = BUS_SPI;
|
||
|
|
bus_io.read = syna_tcm_spi_read;
|
||
|
|
bus_io.write = syna_tcm_spi_write;
|
||
|
|
bus_io.rmi_read = syna_tcm_spi_rmi_read;
|
||
|
|
bus_io.rmi_write = syna_tcm_spi_rmi_write;
|
||
|
|
|
||
|
|
hw_if.bus_io = &bus_io;
|
||
|
|
|
||
|
|
spi->bits_per_word = 8;
|
||
|
|
|
||
|
|
retval = spi_setup(spi);
|
||
|
|
if (retval < 0) {
|
||
|
|
LOG_ERR(&spi->dev,
|
||
|
|
"Failed to set up SPI protocol driver\n");
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
|
||
|
|
syna_tcm_spi_device->dev.parent = &spi->dev;
|
||
|
|
syna_tcm_spi_device->dev.platform_data = &hw_if;
|
||
|
|
|
||
|
|
retval = platform_device_add(syna_tcm_spi_device);
|
||
|
|
if (retval < 0) {
|
||
|
|
LOG_ERR(&spi->dev,
|
||
|
|
"Failed to add platform device\n");
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int syna_tcm_spi_remove(struct spi_device *spi)
|
||
|
|
{
|
||
|
|
syna_tcm_spi_device->dev.platform_data = NULL;
|
||
|
|
|
||
|
|
platform_device_unregister(syna_tcm_spi_device);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct spi_device_id syna_tcm_id_table[] = {
|
||
|
|
{SPI_MODULE_NAME, 0},
|
||
|
|
{},
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(spi, syna_tcm_id_table);
|
||
|
|
|
||
|
|
#ifdef CONFIG_OF
|
||
|
|
static const struct of_device_id syna_tcm_of_match_table[] = {
|
||
|
|
{
|
||
|
|
.compatible = "synaptics,tcm-spi",
|
||
|
|
},
|
||
|
|
{},
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, syna_tcm_of_match_table);
|
||
|
|
#else
|
||
|
|
#define syna_tcm_of_match_table NULL
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static struct spi_driver syna_tcm_spi_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = SPI_MODULE_NAME,
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.of_match_table = syna_tcm_of_match_table,
|
||
|
|
},
|
||
|
|
.probe = syna_tcm_spi_probe,
|
||
|
|
.remove = syna_tcm_spi_remove,
|
||
|
|
.id_table = syna_tcm_id_table,
|
||
|
|
};
|
||
|
|
|
||
|
|
int syna_tcm_bus_init(void)
|
||
|
|
{
|
||
|
|
return spi_register_driver(&syna_tcm_spi_driver);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(syna_tcm_bus_init);
|
||
|
|
|
||
|
|
void syna_tcm_bus_exit(void)
|
||
|
|
{
|
||
|
|
kfree(buf);
|
||
|
|
|
||
|
|
kfree(xfer);
|
||
|
|
|
||
|
|
spi_unregister_driver(&syna_tcm_spi_driver);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(syna_tcm_bus_exit);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Synaptics, Inc.");
|
||
|
|
MODULE_DESCRIPTION("Synaptics TCM SPI Bus Module");
|
||
|
|
MODULE_LICENSE("GPL v2");
|