528 lines
12 KiB
C
528 lines
12 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/i2c.h>
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#include <linux/of_gpio.h>
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#include <linux/of_irq.h>
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#include <linux/pinctrl/pinctrl.h>
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#include "synaptics_tcm_core.h"
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#define XFER_ATTEMPTS 10
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static unsigned char *buf;
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static unsigned int buf_size;
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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_i2c_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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retval = of_property_read_u32(np, "synaptics,irq-gpio", &value);
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if (retval < 0)
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bdata->irq_gpio = -1;
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else
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bdata->irq_gpio = irq_of_parse_and_map(np, 0);
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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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prop = of_find_property(np, "synaptics,y-flip", NULL);
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bdata->y_flip = prop > 0 ? true : false;
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prop = of_find_property(np, "synaptics,max_x", NULL);
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if (prop && prop->length) {
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retval = of_property_read_u32(np, "synaptics,max_x",
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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,max_x property\n");
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return retval;
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}
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bdata->max_x = value;
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} else {
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bdata->max_x = 0;
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}
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prop = of_find_property(np, "synaptics,max_y", NULL);
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if (prop && prop->length) {
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retval = of_property_read_u32(np, "synaptics,max_y",
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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,max_y property\n");
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return retval;
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}
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bdata->max_y = value;
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} else {
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bdata->max_y = 0;
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}
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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,ubl-i2c-addr", NULL);
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if (prop && prop->length) {
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retval = of_property_read_u32(np, "synaptics,ubl-i2c-addr",
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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-i2c-addr property\n");
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return retval;
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}
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bdata->ubl_i2c_addr = value;
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} else {
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bdata->ubl_i2c_addr = 0;
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}
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pr_info("parse dts:bdata->irq_gpio = %d,\n"
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"bdata->irq_on_state = %d,\n"
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"bdata->pwr_reg_name = %d, bdata->bus_reg_name = %d,\n"
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"bdata->power_gpio= %d, bdata->power_on_state = %d,\n"
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"bdata->power_delay_ms = %d,bdata->reset_gpio = %d,\n"
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"bdata->reset_on_state = %d, bdata->reset_active_ms = %d,\n"
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"bdata->reset_delay_ms = %d, bdata->x_flip = %d,\n"
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"bdata->y_flip = %d, bdata->swap_axes = %d,\n"
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"bdata->ubl_i2c_addr = %d, bdata->max_x, bdata->max_y,\n"
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"\n",
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bdata->irq_gpio,
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bdata->irq_on_state,
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bdata->pwr_reg_name,
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bdata->bus_reg_name,
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bdata->power_gpio,
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bdata->power_on_state,
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bdata->power_delay_ms,
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bdata->reset_gpio,
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bdata->reset_on_state,
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bdata->reset_active_ms,
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bdata->reset_delay_ms,
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bdata->x_flip,
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bdata->y_flip,
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bdata->swap_axes,
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bdata->ubl_i2c_addr,
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bdata->max_x,
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bdata->max_y);
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return 0;
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}
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#endif
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static int syna_tcm_i2c_alloc_mem(struct syna_tcm_hcd *tcm_hcd,
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unsigned int size)
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{
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struct i2c_client *i2c = to_i2c_client(tcm_hcd->pdev->dev.parent);
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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(&i2c->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_i2c_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 char address;
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unsigned int attempt;
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struct i2c_msg msg[2];
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struct i2c_client *i2c = to_i2c_client(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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address = (unsigned char)addr;
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msg[0].addr = bdata->ubl_i2c_addr;
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msg[0].flags = 0;
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msg[0].len = 1;
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msg[0].buf = &address;
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msg[1].addr = bdata->ubl_i2c_addr;
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msg[1].flags = I2C_M_RD;
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msg[1].len = length;
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msg[1].buf = data;
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for (attempt = 0; attempt < XFER_ATTEMPTS; attempt++) {
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if (i2c_transfer(i2c->adapter, msg, 2) == 2) {
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retval = length;
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goto exit;
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}
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LOG_ERR(&i2c->dev,
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"Transfer attempt %d failed\n",
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attempt + 1);
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if (attempt + 1 == XFER_ATTEMPTS) {
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retval = -EIO;
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goto exit;
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}
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msleep(20);
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}
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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_i2c_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 attempt;
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unsigned int byte_count;
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struct i2c_msg msg;
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struct i2c_client *i2c = to_i2c_client(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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byte_count = length + 1;
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retval = syna_tcm_i2c_alloc_mem(tcm_hcd, byte_count);
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if (retval < 0) {
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LOG_ERR(&i2c->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;
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retval = secure_memcpy(&buf[1],
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buf_size - 1,
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data,
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length,
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length);
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if (retval < 0) {
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LOG_ERR(&i2c->dev,
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"Failed to copy write data\n");
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goto exit;
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}
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msg.addr = bdata->ubl_i2c_addr;
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msg.flags = 0;
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msg.len = byte_count;
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msg.buf = buf;
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for (attempt = 0; attempt < XFER_ATTEMPTS; attempt++) {
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if (i2c_transfer(i2c->adapter, &msg, 1) == 1) {
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retval = length;
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goto exit;
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}
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LOG_ERR(&i2c->dev,
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"Transfer attempt %d failed\n",
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attempt + 1);
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if (attempt + 1 == XFER_ATTEMPTS) {
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retval = -EIO;
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goto exit;
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}
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msleep(20);
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}
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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_i2c_read(struct syna_tcm_hcd *tcm_hcd, unsigned char *data,
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unsigned int length)
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{
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int retval;
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unsigned int attempt;
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struct i2c_msg msg;
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struct i2c_client *i2c = to_i2c_client(tcm_hcd->pdev->dev.parent);
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mutex_lock(&tcm_hcd->io_ctrl_mutex);
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msg.addr = i2c->addr;
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msg.flags = I2C_M_RD;
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msg.len = length;
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msg.buf = data;
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for (attempt = 0; attempt < XFER_ATTEMPTS; attempt++) {
|
||
|
|
if (i2c_transfer(i2c->adapter, &msg, 1) == 1) {
|
||
|
|
retval = length;
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
LOG_ERR(&i2c->dev,
|
||
|
|
"Transfer attempt %d failed\n",
|
||
|
|
attempt + 1);
|
||
|
|
|
||
|
|
if (attempt + 1 == XFER_ATTEMPTS) {
|
||
|
|
retval = -EIO;
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
msleep(20);
|
||
|
|
}
|
||
|
|
|
||
|
|
exit:
|
||
|
|
mutex_unlock(&tcm_hcd->io_ctrl_mutex);
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int syna_tcm_i2c_write(struct syna_tcm_hcd *tcm_hcd, unsigned char *data,
|
||
|
|
unsigned int length)
|
||
|
|
{
|
||
|
|
int retval;
|
||
|
|
unsigned int attempt;
|
||
|
|
struct i2c_msg msg;
|
||
|
|
struct i2c_client *i2c = to_i2c_client(tcm_hcd->pdev->dev.parent);
|
||
|
|
|
||
|
|
mutex_lock(&tcm_hcd->io_ctrl_mutex);
|
||
|
|
|
||
|
|
msg.addr = i2c->addr;
|
||
|
|
msg.flags = 0;
|
||
|
|
msg.len = length;
|
||
|
|
msg.buf = data;
|
||
|
|
|
||
|
|
for (attempt = 0; attempt < XFER_ATTEMPTS; attempt++) {
|
||
|
|
if (i2c_transfer(i2c->adapter, &msg, 1) == 1) {
|
||
|
|
retval = length;
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
LOG_ERR(&i2c->dev,
|
||
|
|
"Transfer attempt %d failed\n",
|
||
|
|
attempt + 1);
|
||
|
|
|
||
|
|
if (attempt + 1 == XFER_ATTEMPTS) {
|
||
|
|
retval = -EIO;
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
msleep(20);
|
||
|
|
}
|
||
|
|
|
||
|
|
exit:
|
||
|
|
mutex_unlock(&tcm_hcd->io_ctrl_mutex);
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int syna_tcm_i2c_probe(struct i2c_client *i2c,
|
||
|
|
const struct i2c_device_id *dev_id)
|
||
|
|
{
|
||
|
|
int retval;
|
||
|
|
|
||
|
|
syna_tcm_i2c_device = platform_device_alloc(PLATFORM_DRIVER_NAME, 0);
|
||
|
|
if (!syna_tcm_i2c_device) {
|
||
|
|
LOG_ERR(&i2c->dev,
|
||
|
|
"Failed to allocate platform device\n");
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef CONFIG_OF
|
||
|
|
hw_if.bdata = devm_kzalloc(&i2c->dev, sizeof(*hw_if.bdata), GFP_KERNEL);
|
||
|
|
if (!hw_if.bdata) {
|
||
|
|
LOG_ERR(&i2c->dev,
|
||
|
|
"Failed to allocate memory for board data\n");
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
parse_dt(&i2c->dev, hw_if.bdata);
|
||
|
|
#else
|
||
|
|
hw_if.bdata = i2c->dev.platform_data;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
bus_io.type = BUS_I2C;
|
||
|
|
bus_io.read = syna_tcm_i2c_read;
|
||
|
|
bus_io.write = syna_tcm_i2c_write;
|
||
|
|
bus_io.rmi_read = syna_tcm_i2c_rmi_read;
|
||
|
|
bus_io.rmi_write = syna_tcm_i2c_rmi_write;
|
||
|
|
|
||
|
|
hw_if.bus_io = &bus_io;
|
||
|
|
|
||
|
|
syna_tcm_i2c_device->dev.parent = &i2c->dev;
|
||
|
|
syna_tcm_i2c_device->dev.platform_data = &hw_if;
|
||
|
|
|
||
|
|
retval = platform_device_add(syna_tcm_i2c_device);
|
||
|
|
if (retval < 0) {
|
||
|
|
LOG_ERR(&i2c->dev,
|
||
|
|
"Failed to add platform device\n");
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int syna_tcm_i2c_remove(struct i2c_client *i2c)
|
||
|
|
{
|
||
|
|
syna_tcm_i2c_device->dev.platform_data = NULL;
|
||
|
|
|
||
|
|
platform_device_unregister(syna_tcm_i2c_device);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct i2c_device_id syna_tcm_id_table[] = {
|
||
|
|
{I2C_MODULE_NAME, 0},
|
||
|
|
{},
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(i2c, syna_tcm_id_table);
|
||
|
|
|
||
|
|
#ifdef CONFIG_OF
|
||
|
|
static const struct of_device_id syna_tcm_of_match_table[] = {
|
||
|
|
{
|
||
|
|
.compatible = "synaptics,tcm-i2c",
|
||
|
|
},
|
||
|
|
{},
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, syna_tcm_of_match_table);
|
||
|
|
#else
|
||
|
|
#define syna_tcm_of_match_table NULL
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static struct i2c_driver syna_tcm_i2c_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = I2C_MODULE_NAME,
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.of_match_table = syna_tcm_of_match_table,
|
||
|
|
},
|
||
|
|
.probe = syna_tcm_i2c_probe,
|
||
|
|
.remove = syna_tcm_i2c_remove,
|
||
|
|
.id_table = syna_tcm_id_table,
|
||
|
|
};
|
||
|
|
|
||
|
|
int syna_tcm_bus_init(void)
|
||
|
|
{
|
||
|
|
return i2c_add_driver(&syna_tcm_i2c_driver);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(syna_tcm_bus_init);
|
||
|
|
|
||
|
|
void syna_tcm_bus_exit(void)
|
||
|
|
{
|
||
|
|
kfree(buf);
|
||
|
|
|
||
|
|
i2c_del_driver(&syna_tcm_i2c_driver);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(syna_tcm_bus_exit);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Synaptics, Inc.");
|
||
|
|
MODULE_DESCRIPTION("Synaptics TCM I2C Bus Module");
|
||
|
|
MODULE_LICENSE("GPL v2");
|