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684 lines
16 KiB
684 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved. |
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*/ |
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|
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#include <linux/iio/iio.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/mfd/core.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_platform.h> |
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#include "ssp.h" |
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|
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#define SSP_WDT_TIME 10000 |
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#define SSP_LIMIT_RESET_CNT 20 |
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#define SSP_LIMIT_TIMEOUT_CNT 3 |
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|
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/* It is possible that it is max clk rate for version 1.0 of bootcode */ |
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#define SSP_BOOT_SPI_HZ 400000 |
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|
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/* |
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* These fields can look enigmatic but this structure is used mainly to flat |
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* some values and depends on command type. |
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*/ |
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struct ssp_instruction { |
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__le32 a; |
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__le32 b; |
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u8 c; |
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} __attribute__((__packed__)); |
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static const u8 ssp_magnitude_table[] = {110, 85, 171, 71, 203, 195, 0, 67, |
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208, 56, 175, 244, 206, 213, 0, 92, 250, 0, 55, 48, 189, 252, 171, |
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243, 13, 45, 250}; |
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static const struct ssp_sensorhub_info ssp_rinato_info = { |
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.fw_name = "ssp_B2.fw", |
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.fw_crashed_name = "ssp_crashed.fw", |
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.fw_rev = 14052300, |
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.mag_table = ssp_magnitude_table, |
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.mag_length = ARRAY_SIZE(ssp_magnitude_table), |
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}; |
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static const struct ssp_sensorhub_info ssp_thermostat_info = { |
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.fw_name = "thermostat_B2.fw", |
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.fw_crashed_name = "ssp_crashed.fw", |
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.fw_rev = 14080600, |
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.mag_table = ssp_magnitude_table, |
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.mag_length = ARRAY_SIZE(ssp_magnitude_table), |
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}; |
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static const struct mfd_cell sensorhub_sensor_devs[] = { |
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{ |
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.name = "ssp-accelerometer", |
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}, |
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{ |
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.name = "ssp-gyroscope", |
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}, |
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}; |
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static void ssp_toggle_mcu_reset_gpio(struct ssp_data *data) |
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{ |
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gpiod_set_value(data->mcu_reset_gpiod, 0); |
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usleep_range(1000, 1200); |
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gpiod_set_value(data->mcu_reset_gpiod, 1); |
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msleep(50); |
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} |
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static void ssp_sync_available_sensors(struct ssp_data *data) |
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{ |
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int i, ret; |
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for (i = 0; i < SSP_SENSOR_MAX; ++i) { |
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if (data->available_sensors & BIT(i)) { |
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ret = ssp_enable_sensor(data, i, data->delay_buf[i]); |
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if (ret < 0) { |
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dev_err(&data->spi->dev, |
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"Sync sensor nr: %d fail\n", i); |
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continue; |
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} |
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} |
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} |
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ret = ssp_command(data, SSP_MSG2SSP_AP_MCU_SET_DUMPMODE, |
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data->mcu_dump_mode); |
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if (ret < 0) |
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dev_err(&data->spi->dev, |
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"SSP_MSG2SSP_AP_MCU_SET_DUMPMODE failed\n"); |
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} |
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static void ssp_enable_mcu(struct ssp_data *data, bool enable) |
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{ |
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dev_info(&data->spi->dev, "current shutdown = %d, old = %d\n", enable, |
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data->shut_down); |
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if (enable && data->shut_down) { |
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data->shut_down = false; |
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enable_irq(data->spi->irq); |
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enable_irq_wake(data->spi->irq); |
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} else if (!enable && !data->shut_down) { |
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data->shut_down = true; |
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disable_irq(data->spi->irq); |
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disable_irq_wake(data->spi->irq); |
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} else { |
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dev_warn(&data->spi->dev, "current shutdown = %d, old = %d\n", |
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enable, data->shut_down); |
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} |
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} |
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/* |
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* This function is the first one which communicates with the mcu so it is |
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* possible that the first attempt will fail |
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*/ |
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static int ssp_check_fwbl(struct ssp_data *data) |
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{ |
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int retries = 0; |
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while (retries++ < 5) { |
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data->cur_firm_rev = ssp_get_firmware_rev(data); |
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if (data->cur_firm_rev == SSP_INVALID_REVISION || |
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data->cur_firm_rev == SSP_INVALID_REVISION2) { |
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dev_warn(&data->spi->dev, |
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"Invalid revision, trying %d time\n", retries); |
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} else { |
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break; |
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} |
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} |
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if (data->cur_firm_rev == SSP_INVALID_REVISION || |
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data->cur_firm_rev == SSP_INVALID_REVISION2) { |
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dev_err(&data->spi->dev, "SSP_INVALID_REVISION\n"); |
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return SSP_FW_DL_STATE_NEED_TO_SCHEDULE; |
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} |
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dev_info(&data->spi->dev, |
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"MCU Firm Rev : Old = %8u, New = %8u\n", |
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data->cur_firm_rev, |
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data->sensorhub_info->fw_rev); |
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if (data->cur_firm_rev != data->sensorhub_info->fw_rev) |
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return SSP_FW_DL_STATE_NEED_TO_SCHEDULE; |
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return SSP_FW_DL_STATE_NONE; |
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} |
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static void ssp_reset_mcu(struct ssp_data *data) |
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{ |
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ssp_enable_mcu(data, false); |
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ssp_clean_pending_list(data); |
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ssp_toggle_mcu_reset_gpio(data); |
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ssp_enable_mcu(data, true); |
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} |
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static void ssp_wdt_work_func(struct work_struct *work) |
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{ |
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struct ssp_data *data = container_of(work, struct ssp_data, work_wdt); |
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dev_err(&data->spi->dev, "%s - Sensor state: 0x%x, RC: %u, CC: %u\n", |
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__func__, data->available_sensors, data->reset_cnt, |
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data->com_fail_cnt); |
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ssp_reset_mcu(data); |
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data->com_fail_cnt = 0; |
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data->timeout_cnt = 0; |
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} |
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static void ssp_wdt_timer_func(struct timer_list *t) |
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{ |
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struct ssp_data *data = from_timer(data, t, wdt_timer); |
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switch (data->fw_dl_state) { |
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case SSP_FW_DL_STATE_FAIL: |
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case SSP_FW_DL_STATE_DOWNLOADING: |
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case SSP_FW_DL_STATE_SYNC: |
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goto _mod; |
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} |
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if (data->timeout_cnt > SSP_LIMIT_TIMEOUT_CNT || |
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data->com_fail_cnt > SSP_LIMIT_RESET_CNT) |
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queue_work(system_power_efficient_wq, &data->work_wdt); |
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_mod: |
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mod_timer(&data->wdt_timer, jiffies + msecs_to_jiffies(SSP_WDT_TIME)); |
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} |
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static void ssp_enable_wdt_timer(struct ssp_data *data) |
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{ |
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mod_timer(&data->wdt_timer, jiffies + msecs_to_jiffies(SSP_WDT_TIME)); |
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} |
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static void ssp_disable_wdt_timer(struct ssp_data *data) |
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{ |
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del_timer_sync(&data->wdt_timer); |
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cancel_work_sync(&data->work_wdt); |
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} |
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/** |
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* ssp_get_sensor_delay() - gets sensor data acquisition period |
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* @data: sensorhub structure |
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* @type: SSP sensor type |
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* |
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* Returns acquisition period in ms |
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*/ |
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u32 ssp_get_sensor_delay(struct ssp_data *data, enum ssp_sensor_type type) |
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{ |
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return data->delay_buf[type]; |
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} |
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EXPORT_SYMBOL(ssp_get_sensor_delay); |
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/** |
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* ssp_enable_sensor() - enables data acquisition for sensor |
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* @data: sensorhub structure |
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* @type: SSP sensor type |
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* @delay: delay in ms |
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* |
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* Returns 0 or negative value in case of error |
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*/ |
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int ssp_enable_sensor(struct ssp_data *data, enum ssp_sensor_type type, |
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u32 delay) |
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{ |
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int ret; |
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struct ssp_instruction to_send; |
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to_send.a = cpu_to_le32(delay); |
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to_send.b = cpu_to_le32(data->batch_latency_buf[type]); |
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to_send.c = data->batch_opt_buf[type]; |
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switch (data->check_status[type]) { |
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case SSP_INITIALIZATION_STATE: |
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/* do calibration step, now just enable */ |
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case SSP_ADD_SENSOR_STATE: |
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ret = ssp_send_instruction(data, |
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SSP_MSG2SSP_INST_BYPASS_SENSOR_ADD, |
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type, |
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(u8 *)&to_send, sizeof(to_send)); |
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if (ret < 0) { |
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dev_err(&data->spi->dev, "Enabling sensor failed\n"); |
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data->check_status[type] = SSP_NO_SENSOR_STATE; |
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goto derror; |
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} |
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data->sensor_enable |= BIT(type); |
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data->check_status[type] = SSP_RUNNING_SENSOR_STATE; |
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break; |
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case SSP_RUNNING_SENSOR_STATE: |
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ret = ssp_send_instruction(data, |
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SSP_MSG2SSP_INST_CHANGE_DELAY, type, |
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(u8 *)&to_send, sizeof(to_send)); |
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if (ret < 0) { |
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dev_err(&data->spi->dev, |
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"Changing sensor delay failed\n"); |
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goto derror; |
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} |
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break; |
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default: |
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data->check_status[type] = SSP_ADD_SENSOR_STATE; |
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break; |
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} |
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data->delay_buf[type] = delay; |
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if (atomic_inc_return(&data->enable_refcount) == 1) |
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ssp_enable_wdt_timer(data); |
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return 0; |
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derror: |
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return ret; |
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} |
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EXPORT_SYMBOL(ssp_enable_sensor); |
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/** |
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* ssp_change_delay() - changes data acquisition for sensor |
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* @data: sensorhub structure |
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* @type: SSP sensor type |
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* @delay: delay in ms |
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* |
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* Returns 0 or negative value in case of error |
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*/ |
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int ssp_change_delay(struct ssp_data *data, enum ssp_sensor_type type, |
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u32 delay) |
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{ |
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int ret; |
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struct ssp_instruction to_send; |
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to_send.a = cpu_to_le32(delay); |
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to_send.b = cpu_to_le32(data->batch_latency_buf[type]); |
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to_send.c = data->batch_opt_buf[type]; |
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ret = ssp_send_instruction(data, SSP_MSG2SSP_INST_CHANGE_DELAY, type, |
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(u8 *)&to_send, sizeof(to_send)); |
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if (ret < 0) { |
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dev_err(&data->spi->dev, "Changing sensor delay failed\n"); |
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return ret; |
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} |
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data->delay_buf[type] = delay; |
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return 0; |
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} |
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EXPORT_SYMBOL(ssp_change_delay); |
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/** |
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* ssp_disable_sensor() - disables sensor |
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* |
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* @data: sensorhub structure |
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* @type: SSP sensor type |
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* |
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* Returns 0 or negative value in case of error |
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*/ |
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int ssp_disable_sensor(struct ssp_data *data, enum ssp_sensor_type type) |
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{ |
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int ret; |
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__le32 command; |
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if (data->sensor_enable & BIT(type)) { |
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command = cpu_to_le32(data->delay_buf[type]); |
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ret = ssp_send_instruction(data, |
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SSP_MSG2SSP_INST_BYPASS_SENSOR_RM, |
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type, (u8 *)&command, |
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sizeof(command)); |
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if (ret < 0) { |
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dev_err(&data->spi->dev, "Remove sensor fail\n"); |
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return ret; |
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} |
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data->sensor_enable &= ~BIT(type); |
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} |
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data->check_status[type] = SSP_ADD_SENSOR_STATE; |
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if (atomic_dec_and_test(&data->enable_refcount)) |
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ssp_disable_wdt_timer(data); |
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return 0; |
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} |
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EXPORT_SYMBOL(ssp_disable_sensor); |
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static irqreturn_t ssp_irq_thread_fn(int irq, void *dev_id) |
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{ |
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struct ssp_data *data = dev_id; |
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/* |
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* This wrapper is done to preserve error path for ssp_irq_msg, also |
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* it is defined in different file. |
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*/ |
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ssp_irq_msg(data); |
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return IRQ_HANDLED; |
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} |
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static int ssp_initialize_mcu(struct ssp_data *data) |
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{ |
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int ret; |
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ssp_clean_pending_list(data); |
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ret = ssp_get_chipid(data); |
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if (ret != SSP_DEVICE_ID) { |
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dev_err(&data->spi->dev, "%s - MCU %s ret = %d\n", __func__, |
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ret < 0 ? "is not working" : "identification failed", |
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ret); |
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return ret < 0 ? ret : -ENODEV; |
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} |
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dev_info(&data->spi->dev, "MCU device ID = %d\n", ret); |
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|
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/* |
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* needs clarification, for now do not want to export all transfer |
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* methods to sensors' drivers |
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*/ |
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ret = ssp_set_magnetic_matrix(data); |
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if (ret < 0) { |
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dev_err(&data->spi->dev, |
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"%s - ssp_set_magnetic_matrix failed\n", __func__); |
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return ret; |
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} |
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data->available_sensors = ssp_get_sensor_scanning_info(data); |
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if (data->available_sensors == 0) { |
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dev_err(&data->spi->dev, |
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"%s - ssp_get_sensor_scanning_info failed\n", __func__); |
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return -EIO; |
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} |
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data->cur_firm_rev = ssp_get_firmware_rev(data); |
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dev_info(&data->spi->dev, "MCU Firm Rev : New = %8u\n", |
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data->cur_firm_rev); |
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return ssp_command(data, SSP_MSG2SSP_AP_MCU_DUMP_CHECK, 0); |
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} |
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/* |
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* sensorhub can request its reinitialization as some brutal and rare error |
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* handling. It can be requested from the MCU. |
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*/ |
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static void ssp_refresh_task(struct work_struct *work) |
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{ |
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struct ssp_data *data = container_of((struct delayed_work *)work, |
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struct ssp_data, work_refresh); |
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dev_info(&data->spi->dev, "refreshing\n"); |
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data->reset_cnt++; |
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if (ssp_initialize_mcu(data) >= 0) { |
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ssp_sync_available_sensors(data); |
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if (data->last_ap_state != 0) |
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ssp_command(data, data->last_ap_state, 0); |
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if (data->last_resume_state != 0) |
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ssp_command(data, data->last_resume_state, 0); |
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data->timeout_cnt = 0; |
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data->com_fail_cnt = 0; |
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} |
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} |
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int ssp_queue_ssp_refresh_task(struct ssp_data *data, unsigned int delay) |
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{ |
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cancel_delayed_work_sync(&data->work_refresh); |
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return queue_delayed_work(system_power_efficient_wq, |
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&data->work_refresh, |
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msecs_to_jiffies(delay)); |
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} |
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#ifdef CONFIG_OF |
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static const struct of_device_id ssp_of_match[] = { |
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{ |
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.compatible = "samsung,sensorhub-rinato", |
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.data = &ssp_rinato_info, |
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}, { |
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.compatible = "samsung,sensorhub-thermostat", |
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.data = &ssp_thermostat_info, |
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}, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, ssp_of_match); |
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static struct ssp_data *ssp_parse_dt(struct device *dev) |
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{ |
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struct ssp_data *data; |
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struct device_node *node = dev->of_node; |
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const struct of_device_id *match; |
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
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if (!data) |
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return NULL; |
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data->mcu_ap_gpiod = devm_gpiod_get(dev, "mcu-ap", GPIOD_IN); |
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if (IS_ERR(data->mcu_ap_gpiod)) |
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return NULL; |
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data->ap_mcu_gpiod = devm_gpiod_get(dev, "ap-mcu", GPIOD_OUT_HIGH); |
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if (IS_ERR(data->ap_mcu_gpiod)) |
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return NULL; |
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data->mcu_reset_gpiod = devm_gpiod_get(dev, "mcu-reset", |
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GPIOD_OUT_HIGH); |
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if (IS_ERR(data->mcu_reset_gpiod)) |
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return NULL; |
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match = of_match_node(ssp_of_match, node); |
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if (!match) |
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return NULL; |
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data->sensorhub_info = match->data; |
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dev_set_drvdata(dev, data); |
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|
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return data; |
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} |
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#else |
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static struct ssp_data *ssp_parse_dt(struct device *pdev) |
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{ |
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return NULL; |
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} |
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#endif |
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|
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/** |
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* ssp_register_consumer() - registers iio consumer in ssp framework |
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* |
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* @indio_dev: consumer iio device |
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* @type: ssp sensor type |
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*/ |
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void ssp_register_consumer(struct iio_dev *indio_dev, enum ssp_sensor_type type) |
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{ |
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struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent); |
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|
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data->sensor_devs[type] = indio_dev; |
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} |
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EXPORT_SYMBOL(ssp_register_consumer); |
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|
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static int ssp_probe(struct spi_device *spi) |
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{ |
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int ret, i; |
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struct ssp_data *data; |
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data = ssp_parse_dt(&spi->dev); |
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if (!data) { |
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dev_err(&spi->dev, "Failed to find platform data\n"); |
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return -ENODEV; |
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} |
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ret = mfd_add_devices(&spi->dev, PLATFORM_DEVID_NONE, |
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sensorhub_sensor_devs, |
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ARRAY_SIZE(sensorhub_sensor_devs), NULL, 0, NULL); |
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if (ret < 0) { |
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dev_err(&spi->dev, "mfd add devices fail\n"); |
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return ret; |
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} |
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|
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spi->mode = SPI_MODE_1; |
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ret = spi_setup(spi); |
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if (ret < 0) { |
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dev_err(&spi->dev, "Failed to setup spi\n"); |
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return ret; |
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} |
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|
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data->fw_dl_state = SSP_FW_DL_STATE_NONE; |
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data->spi = spi; |
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spi_set_drvdata(spi, data); |
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|
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mutex_init(&data->comm_lock); |
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|
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for (i = 0; i < SSP_SENSOR_MAX; ++i) { |
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data->delay_buf[i] = SSP_DEFAULT_POLLING_DELAY; |
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data->batch_latency_buf[i] = 0; |
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data->batch_opt_buf[i] = 0; |
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data->check_status[i] = SSP_INITIALIZATION_STATE; |
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} |
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|
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data->delay_buf[SSP_BIO_HRM_LIB] = 100; |
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|
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data->time_syncing = true; |
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|
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mutex_init(&data->pending_lock); |
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INIT_LIST_HEAD(&data->pending_list); |
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|
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atomic_set(&data->enable_refcount, 0); |
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|
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INIT_WORK(&data->work_wdt, ssp_wdt_work_func); |
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INIT_DELAYED_WORK(&data->work_refresh, ssp_refresh_task); |
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|
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timer_setup(&data->wdt_timer, ssp_wdt_timer_func, 0); |
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|
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ret = request_threaded_irq(data->spi->irq, NULL, |
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ssp_irq_thread_fn, |
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
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"SSP_Int", data); |
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if (ret < 0) { |
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dev_err(&spi->dev, "Irq request fail\n"); |
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goto err_setup_irq; |
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} |
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|
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/* Let's start with enabled one so irq balance could be ok */ |
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data->shut_down = false; |
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|
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/* just to avoid unbalanced irq set wake up */ |
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enable_irq_wake(data->spi->irq); |
|
|
|
data->fw_dl_state = ssp_check_fwbl(data); |
|
if (data->fw_dl_state == SSP_FW_DL_STATE_NONE) { |
|
ret = ssp_initialize_mcu(data); |
|
if (ret < 0) { |
|
dev_err(&spi->dev, "Initialize_mcu failed\n"); |
|
goto err_read_reg; |
|
} |
|
} else { |
|
dev_err(&spi->dev, "Firmware version not supported\n"); |
|
ret = -EPERM; |
|
goto err_read_reg; |
|
} |
|
|
|
return 0; |
|
|
|
err_read_reg: |
|
free_irq(data->spi->irq, data); |
|
err_setup_irq: |
|
mutex_destroy(&data->pending_lock); |
|
mutex_destroy(&data->comm_lock); |
|
|
|
dev_err(&spi->dev, "Probe failed!\n"); |
|
|
|
return ret; |
|
} |
|
|
|
static int ssp_remove(struct spi_device *spi) |
|
{ |
|
struct ssp_data *data = spi_get_drvdata(spi); |
|
|
|
if (ssp_command(data, SSP_MSG2SSP_AP_STATUS_SHUTDOWN, 0) < 0) |
|
dev_err(&data->spi->dev, |
|
"SSP_MSG2SSP_AP_STATUS_SHUTDOWN failed\n"); |
|
|
|
ssp_enable_mcu(data, false); |
|
ssp_disable_wdt_timer(data); |
|
|
|
ssp_clean_pending_list(data); |
|
|
|
free_irq(data->spi->irq, data); |
|
|
|
del_timer_sync(&data->wdt_timer); |
|
cancel_work_sync(&data->work_wdt); |
|
|
|
mutex_destroy(&data->comm_lock); |
|
mutex_destroy(&data->pending_lock); |
|
|
|
mfd_remove_devices(&spi->dev); |
|
|
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
static int ssp_suspend(struct device *dev) |
|
{ |
|
int ret; |
|
struct ssp_data *data = spi_get_drvdata(to_spi_device(dev)); |
|
|
|
data->last_resume_state = SSP_MSG2SSP_AP_STATUS_SUSPEND; |
|
|
|
if (atomic_read(&data->enable_refcount) > 0) |
|
ssp_disable_wdt_timer(data); |
|
|
|
ret = ssp_command(data, SSP_MSG2SSP_AP_STATUS_SUSPEND, 0); |
|
if (ret < 0) { |
|
dev_err(&data->spi->dev, |
|
"%s SSP_MSG2SSP_AP_STATUS_SUSPEND failed\n", __func__); |
|
|
|
ssp_enable_wdt_timer(data); |
|
return ret; |
|
} |
|
|
|
data->time_syncing = false; |
|
disable_irq(data->spi->irq); |
|
|
|
return 0; |
|
} |
|
|
|
static int ssp_resume(struct device *dev) |
|
{ |
|
int ret; |
|
struct ssp_data *data = spi_get_drvdata(to_spi_device(dev)); |
|
|
|
enable_irq(data->spi->irq); |
|
|
|
if (atomic_read(&data->enable_refcount) > 0) |
|
ssp_enable_wdt_timer(data); |
|
|
|
ret = ssp_command(data, SSP_MSG2SSP_AP_STATUS_RESUME, 0); |
|
if (ret < 0) { |
|
dev_err(&data->spi->dev, |
|
"%s SSP_MSG2SSP_AP_STATUS_RESUME failed\n", __func__); |
|
ssp_disable_wdt_timer(data); |
|
return ret; |
|
} |
|
|
|
/* timesyncing is set by MCU */ |
|
data->last_resume_state = SSP_MSG2SSP_AP_STATUS_RESUME; |
|
|
|
return 0; |
|
} |
|
#endif /* CONFIG_PM_SLEEP */ |
|
|
|
static const struct dev_pm_ops ssp_pm_ops = { |
|
SET_SYSTEM_SLEEP_PM_OPS(ssp_suspend, ssp_resume) |
|
}; |
|
|
|
static struct spi_driver ssp_driver = { |
|
.probe = ssp_probe, |
|
.remove = ssp_remove, |
|
.driver = { |
|
.pm = &ssp_pm_ops, |
|
.of_match_table = of_match_ptr(ssp_of_match), |
|
.name = "sensorhub" |
|
}, |
|
}; |
|
|
|
module_spi_driver(ssp_driver); |
|
|
|
MODULE_DESCRIPTION("ssp sensorhub driver"); |
|
MODULE_AUTHOR("Samsung Electronics"); |
|
MODULE_LICENSE("GPL");
|
|
|