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/*
* Copyright 2010, Cypress Semiconductor Corporation.
* Copyright (C) 2010-2011, Samsung Electronics Co. Ltd. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301, USA.
*
*/
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/input/cypress-touchkey.h>
#include <linux/gpio.h>
#include "cypress-touchkey-firmware.h"
#define WRITE_BYTE_START 0x90
#define WRITE_BYTE_END 0xE0
#define NUM_BLOCK_END 0xE0
static void touchkey_init_gpio(struct touchkey_platform_data *pdata)
{
gpio_direction_input(pdata->sda_pin);
gpio_direction_input(pdata->scl_pin);
gpio_set_value(pdata->en_pin, 1);
mdelay(1);
}
static void touchkey_run_clk(struct touchkey_platform_data *pdata,
int cycles)
{
int i;
for (i = 0; i < cycles; i++) {
gpio_direction_output(pdata->scl_pin, 0);
gpio_direction_output(pdata->scl_pin, 1);
}
}
static u8 touchkey_get_data(struct touchkey_platform_data *pdata)
{
gpio_direction_input(pdata->sda_pin);
return !!gpio_get_value(pdata->sda_pin);
}
static u8 touchkey_read_bit(struct touchkey_platform_data *pdata)
{
touchkey_run_clk(pdata, 1);
return touchkey_get_data(pdata);
}
static u8 touchkey_read_byte(struct touchkey_platform_data *pdata)
{
int i;
u8 byte = 0;
for (i = 7; i >= 0; i--)
byte |= touchkey_read_bit(pdata) << i;
return byte;
}
static void touchkey_send_bits(struct touchkey_platform_data *pdata,
u8 data, int num_bits)
{
int i;
for (i = 0; i < num_bits; i++, data <<= 1) {
gpio_direction_output(pdata->sda_pin, !!(data & 0x80));
gpio_direction_output(pdata->scl_pin, 1);
gpio_direction_output(pdata->scl_pin, 0);
}
}
static void touchkey_send_vector(struct touchkey_platform_data *pdata,
const struct issp_vector *vector_data)
{
int i;
u16 num_bits;
for (i = 0, num_bits = vector_data->num_bits; num_bits > 7;
num_bits -= 8, i++)
touchkey_send_bits(pdata, vector_data->data[i], 8);
if (num_bits)
touchkey_send_bits(pdata, vector_data->data[i], num_bits);
gpio_direction_output(pdata->sda_pin, 0);
gpio_direction_input(pdata->sda_pin);
}
static bool touchkey_wait_transaction(struct touchkey_platform_data *pdata)
{
int i;
for (i = 0; i <= TRANSITION_TIMEOUT; i++) {
gpio_direction_output(pdata->scl_pin, 0);
if (touchkey_get_data(pdata))
break;
gpio_direction_output(pdata->scl_pin, 1);
}
if (i == TRANSITION_TIMEOUT)
return true;
for (i = 0; i <= TRANSITION_TIMEOUT; i++) {
gpio_direction_output(pdata->scl_pin, 0);
if (!touchkey_get_data(pdata))
break;
gpio_direction_output(pdata->scl_pin, 1);
}
return i == TRANSITION_TIMEOUT;
}
static int touchkey_issp_pwr_init(struct touchkey_platform_data *pdata)
{
touchkey_init_gpio(pdata);
if (touchkey_wait_transaction(pdata))
return -1;
gpio_direction_output(pdata->scl_pin, 0);
touchkey_send_vector(pdata, &wait_and_poll_end);
touchkey_send_vector(pdata, &id_setup_1);
if (touchkey_wait_transaction(pdata))
return -1;
touchkey_send_vector(pdata, &wait_and_poll_end);
return 0;
}
static int touchkey_read_status(struct touchkey_platform_data *pdata)
{
unsigned char target_status;
touchkey_send_vector(pdata, &tsync_enable);
touchkey_send_vector(pdata, &read_id_v1);
touchkey_run_clk(pdata, 2);
target_status = touchkey_read_byte(pdata);
touchkey_run_clk(pdata, 1);
touchkey_send_bits(pdata, 0, 1);
touchkey_send_vector(pdata, &tsync_disable);
return target_status;
}
static int touchkey_erase_target(struct touchkey_platform_data *pdata)
{
touchkey_send_vector(pdata, &erase);
if (touchkey_wait_transaction(pdata))
return -1;
touchkey_send_vector(pdata, &wait_and_poll_end);
return 0;
}
static u16 touchkey_load_target(struct touchkey_platform_data *pdata,
const u8 *target_data_output, int len)
{
u16 checksum_data = 0;
u8 addr;
int i;
for (i = 0, addr = 0; i < len; i++, addr += 2) {
checksum_data += target_data_output[i];
touchkey_send_bits(pdata, WRITE_BYTE_START, 4);
touchkey_send_bits(pdata, addr, 7);
touchkey_send_bits(pdata, target_data_output[i], 8);
touchkey_send_bits(pdata, WRITE_BYTE_END, 3);
}
return checksum_data;
}
static int touchkey_program_target_block(struct touchkey_platform_data *pdata,
u8 block)
{
touchkey_send_vector(pdata, &tsync_enable);
touchkey_send_vector(pdata, &set_block_num);
touchkey_send_bits(pdata, block, 8);
touchkey_send_bits(pdata, NUM_BLOCK_END, 3);
touchkey_send_vector(pdata, &tsync_disable);
touchkey_send_vector(pdata, &program_and_verify);
if (touchkey_wait_transaction(pdata))
return -1;
touchkey_send_vector(pdata, &wait_and_poll_end);
return 0;
}
static int touchkey_target_bank_checksum(struct touchkey_platform_data *pdata,
u16 *checksum)
{
touchkey_send_vector(pdata, &checksum_setup);
if (touchkey_wait_transaction(pdata))
return -1;
touchkey_send_vector(pdata, &wait_and_poll_end);
touchkey_send_vector(pdata, &tsync_enable);
touchkey_send_vector(pdata, &read_checksum_v1);
touchkey_run_clk(pdata, 2);
*checksum = touchkey_read_byte(pdata) << 8;
touchkey_run_clk(pdata, 1);
touchkey_send_vector(pdata, &read_checksum_v2);
touchkey_run_clk(pdata, 2);
*checksum |= touchkey_read_byte(pdata);
touchkey_run_clk(pdata, 1);
touchkey_send_bits(pdata, 0x80, 1);
touchkey_send_vector(pdata, &tsync_disable);
return 0;
}
static void touchkey_reset_target(struct touchkey_platform_data *pdata)
{
gpio_direction_input(pdata->scl_pin);
gpio_direction_input(pdata->sda_pin);
gpio_set_value(pdata->en_pin, 0);
mdelay(300);
touchkey_init_gpio(pdata);
}
static int touchkey_secure_target_flash(struct touchkey_platform_data *pdata)
{
u8 addr;
int i;
for (i = 0, addr = 0; i < SECURITY_BYTES_PER_BANK; i++, addr += 2) {
touchkey_send_bits(pdata, WRITE_BYTE_START, 4);
touchkey_send_bits(pdata, addr, 7);
touchkey_send_bits(pdata, 0xFF, 8);
touchkey_send_bits(pdata, WRITE_BYTE_END, 3);
}
touchkey_send_vector(pdata, &secure);
if (touchkey_wait_transaction(pdata))
return -1;
touchkey_send_vector(pdata, &wait_and_poll_end);
return 0;
}
int touchkey_flash_firmware(struct touchkey_platform_data *pdata,
const u8 *fw_data)
{
u16 chksumtgt = 0;
u16 chksumdat = 0;
int i;
gpio_direction_output(pdata->en_pin, 0);
if (touchkey_issp_pwr_init(pdata)) {
pr_err("%s: error powering up\n", __func__);
goto error_trap;
}
if (touchkey_erase_target(pdata)) {
pr_err("%s: error erasing flash\n", __func__);
goto error_trap;
}
for (i = 0; i < BLOCKS_PER_BANK; i++) {
touchkey_send_vector(pdata, &tsync_enable);
touchkey_send_vector(pdata, &read_write_setup);
chksumdat += touchkey_load_target(pdata,
fw_data + i * BLOCK_SIZE, BLOCK_SIZE);
if (touchkey_program_target_block(pdata, i)) {
pr_err("%s: error programming flash\n", __func__);
goto error_trap;
}
if (touchkey_read_status(pdata)) {
pr_err("%s: error reading status\n", __func__);
goto error_trap;
}
}
/* security start */
touchkey_send_vector(pdata, &tsync_enable);
touchkey_send_vector(pdata, &read_write_setup);
if (touchkey_secure_target_flash(pdata)) {
pr_err("%s: error securing flash\n", __func__);
goto error_trap;
}
if (touchkey_target_bank_checksum(pdata, &chksumtgt)) {
pr_err("%s: error reading checksum\n", __func__);
goto error_trap;
}
if (chksumtgt != chksumdat) {
pr_err("%s: error powering up touchkey controller\n", __func__);
goto error_trap;
}
touchkey_reset_target(pdata);
return 0;
error_trap:
gpio_direction_input(pdata->scl_pin);
gpio_direction_input(pdata->sda_pin);
gpio_set_value(pdata->en_pin, 0);
mdelay(20);
return -1;
}
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