| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Dudley Du | 4414 | 74.44% | 18 | 64.29% |
| Benson Leung | 1494 | 25.19% | 2 | 7.14% |
| Andrzej Pietrasiewicz | 9 | 0.15% | 1 | 3.57% |
| Jonathan Cameron | 5 | 0.08% | 1 | 3.57% |
| Fuqian Huang | 3 | 0.05% | 1 | 3.57% |
| Dmitry Torokhov | 1 | 0.02% | 1 | 3.57% |
| Lee Jones | 1 | 0.02% | 1 | 3.57% |
| Uwe Kleine-König | 1 | 0.02% | 1 | 3.57% |
| Guenter Roeck | 1 | 0.02% | 1 | 3.57% |
| Dan Carpenter | 1 | 0.02% | 1 | 3.57% |
| Total | 5930 | 28 |
/* * Cypress APA trackpad with I2C interface * * Author: Dudley Du <dudl@cypress.com> * Further cleanup and restructuring by: * Daniel Kurtz <djkurtz@chromium.org> * Benson Leung <bleung@chromium.org> * * Copyright (C) 2011-2015 Cypress Semiconductor, Inc. * Copyright (C) 2011-2012 Google, Inc. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive for * more details. */ #include <linux/delay.h> #include <linux/i2c.h> #include <linux/input.h> #include <linux/input/mt.h> #include <linux/interrupt.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/regulator/consumer.h> #include <linux/slab.h> #include <linux/uaccess.h> #include <linux/pm_runtime.h> #include <linux/acpi.h> #include <linux/of.h> #include "cyapa.h" #define CYAPA_ADAPTER_FUNC_NONE 0 #define CYAPA_ADAPTER_FUNC_I2C 1 #define CYAPA_ADAPTER_FUNC_SMBUS 2 #define CYAPA_ADAPTER_FUNC_BOTH 3 #define CYAPA_FW_NAME "cyapa.bin" const char product_id[] = "CYTRA"; static int cyapa_reinitialize(struct cyapa *cyapa); bool cyapa_is_pip_bl_mode(struct cyapa *cyapa) { if (cyapa->gen == CYAPA_GEN6 && cyapa->state == CYAPA_STATE_GEN6_BL) return true; if (cyapa->gen == CYAPA_GEN5 && cyapa->state == CYAPA_STATE_GEN5_BL) return true; return false; } bool cyapa_is_pip_app_mode(struct cyapa *cyapa) { if (cyapa->gen == CYAPA_GEN6 && cyapa->state == CYAPA_STATE_GEN6_APP) return true; if (cyapa->gen == CYAPA_GEN5 && cyapa->state == CYAPA_STATE_GEN5_APP) return true; return false; } static bool cyapa_is_bootloader_mode(struct cyapa *cyapa) { if (cyapa_is_pip_bl_mode(cyapa)) return true; if (cyapa->gen == CYAPA_GEN3 && cyapa->state >= CYAPA_STATE_BL_BUSY && cyapa->state <= CYAPA_STATE_BL_ACTIVE) return true; return false; } static inline bool cyapa_is_operational_mode(struct cyapa *cyapa) { if (cyapa_is_pip_app_mode(cyapa)) return true; if (cyapa->gen == CYAPA_GEN3 && cyapa->state == CYAPA_STATE_OP) return true; return false; } /* Returns 0 on success, else negative errno on failure. */ static ssize_t cyapa_i2c_read(struct cyapa *cyapa, u8 reg, size_t len, u8 *values) { struct i2c_client *client = cyapa->client; struct i2c_msg msgs[] = { { .addr = client->addr, .flags = 0, .len = 1, .buf = ®, }, { .addr = client->addr, .flags = I2C_M_RD, .len = len, .buf = values, }, }; int ret; ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); if (ret != ARRAY_SIZE(msgs)) return ret < 0 ? ret : -EIO; return 0; } /** * cyapa_i2c_write - Execute i2c block data write operation * @cyapa: Handle to this driver * @reg: Offset of the data to written in the register map * @len: number of bytes to write * @values: Data to be written * * Return negative errno code on error; return zero when success. */ static int cyapa_i2c_write(struct cyapa *cyapa, u8 reg, size_t len, const void *values) { struct i2c_client *client = cyapa->client; char buf[32]; int ret; if (len > sizeof(buf) - 1) return -ENOMEM; buf[0] = reg; memcpy(&buf[1], values, len); ret = i2c_master_send(client, buf, len + 1); if (ret != len + 1) return ret < 0 ? ret : -EIO; return 0; } static u8 cyapa_check_adapter_functionality(struct i2c_client *client) { u8 ret = CYAPA_ADAPTER_FUNC_NONE; if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) ret |= CYAPA_ADAPTER_FUNC_I2C; if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) ret |= CYAPA_ADAPTER_FUNC_SMBUS; return ret; } /* * Query device for its current operating state. */ static int cyapa_get_state(struct cyapa *cyapa) { u8 status[BL_STATUS_SIZE]; u8 cmd[32]; /* The i2c address of gen4 and gen5 trackpad device must be even. */ bool even_addr = ((cyapa->client->addr & 0x0001) == 0); bool smbus = false; int retries = 2; int error; cyapa->state = CYAPA_STATE_NO_DEVICE; /* * Get trackpad status by reading 3 registers starting from 0. * If the device is in the bootloader, this will be BL_HEAD. * If the device is in operation mode, this will be the DATA regs. * */ error = cyapa_i2c_reg_read_block(cyapa, BL_HEAD_OFFSET, BL_STATUS_SIZE, status); /* * On smbus systems in OP mode, the i2c_reg_read will fail with * -ETIMEDOUT. In this case, try again using the smbus equivalent * command. This should return a BL_HEAD indicating CYAPA_STATE_OP. */ if (cyapa->smbus && (error == -ETIMEDOUT || error == -ENXIO)) { if (!even_addr) error = cyapa_read_block(cyapa, CYAPA_CMD_BL_STATUS, status); smbus = true; } if (error != BL_STATUS_SIZE) goto error; /* * Detect trackpad protocol based on characteristic registers and bits. */ do { cyapa->status[REG_OP_STATUS] = status[REG_OP_STATUS]; cyapa->status[REG_BL_STATUS] = status[REG_BL_STATUS]; cyapa->status[REG_BL_ERROR] = status[REG_BL_ERROR]; if (cyapa->gen == CYAPA_GEN_UNKNOWN || cyapa->gen == CYAPA_GEN3) { error = cyapa_gen3_ops.state_parse(cyapa, status, BL_STATUS_SIZE); if (!error) goto out_detected; } if (cyapa->gen == CYAPA_GEN_UNKNOWN || cyapa->gen == CYAPA_GEN6 || cyapa->gen == CYAPA_GEN5) { error = cyapa_pip_state_parse(cyapa, status, BL_STATUS_SIZE); if (!error) goto out_detected; } /* For old Gen5 trackpads detecting. */ if ((cyapa->gen == CYAPA_GEN_UNKNOWN || cyapa->gen == CYAPA_GEN5) && !smbus && even_addr) { error = cyapa_gen5_ops.state_parse(cyapa, status, BL_STATUS_SIZE); if (!error) goto out_detected; } /* * Write 0x00 0x00 to trackpad device to force update its * status, then redo the detection again. */ if (!smbus) { cmd[0] = 0x00; cmd[1] = 0x00; error = cyapa_i2c_write(cyapa, 0, 2, cmd); if (error) goto error; msleep(50); error = cyapa_i2c_read(cyapa, BL_HEAD_OFFSET, BL_STATUS_SIZE, status); if (error) goto error; } } while (--retries > 0 && !smbus); goto error; out_detected: if (cyapa->state <= CYAPA_STATE_BL_BUSY) return -EAGAIN; return 0; error: return (error < 0) ? error : -EAGAIN; } /* * Poll device for its status in a loop, waiting up to timeout for a response. * * When the device switches state, it usually takes ~300 ms. * However, when running a new firmware image, the device must calibrate its * sensors, which can take as long as 2 seconds. * * Note: The timeout has granularity of the polling rate, which is 100 ms. * * Returns: * 0 when the device eventually responds with a valid non-busy state. * -ETIMEDOUT if device never responds (too many -EAGAIN) * -EAGAIN if bootload is busy, or unknown state. * < 0 other errors */ int cyapa_poll_state(struct cyapa *cyapa, unsigned int timeout) { int error; int tries = timeout / 100; do { error = cyapa_get_state(cyapa); if (!error && cyapa->state > CYAPA_STATE_BL_BUSY) return 0; msleep(100); } while (tries--); return (error == -EAGAIN || error == -ETIMEDOUT) ? -ETIMEDOUT : error; } /* * Check if device is operational. * * An operational device is responding, has exited bootloader, and has * firmware supported by this driver. * * Returns: * -ENODEV no device * -EBUSY no device or in bootloader * -EIO failure while reading from device * -ETIMEDOUT timeout failure for bus idle or bus no response * -EAGAIN device is still in bootloader * if ->state = CYAPA_STATE_BL_IDLE, device has invalid firmware * -EINVAL device is in operational mode, but not supported by this driver * 0 device is supported */ static int cyapa_check_is_operational(struct cyapa *cyapa) { int error; error = cyapa_poll_state(cyapa, 4000); if (error) return error; switch (cyapa->gen) { case CYAPA_GEN6: cyapa->ops = &cyapa_gen6_ops; break; case CYAPA_GEN5: cyapa->ops = &cyapa_gen5_ops; break; case CYAPA_GEN3: cyapa->ops = &cyapa_gen3_ops; break; default: return -ENODEV; } error = cyapa->ops->operational_check(cyapa); if (!error && cyapa_is_operational_mode(cyapa)) cyapa->operational = true; else cyapa->operational = false; return error; } /* * Returns 0 on device detected, negative errno on no device detected. * And when the device is detected and operational, it will be reset to * full power active mode automatically. */ static int cyapa_detect(struct cyapa *cyapa) { struct device *dev = &cyapa->client->dev; int error; error = cyapa_check_is_operational(cyapa); if (error) { if (error != -ETIMEDOUT && error != -ENODEV && cyapa_is_bootloader_mode(cyapa)) { dev_warn(dev, "device detected but not operational\n"); return 0; } dev_err(dev, "no device detected: %d\n", error); return error; } return 0; } static int cyapa_open(struct input_dev *input) { struct cyapa *cyapa = input_get_drvdata(input); struct i2c_client *client = cyapa->client; struct device *dev = &client->dev; int error; error = mutex_lock_interruptible(&cyapa->state_sync_lock); if (error) return error; if (cyapa->operational) { /* * though failed to set active power mode, * but still may be able to work in lower scan rate * when in operational mode. */ error = cyapa->ops->set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE, 0, CYAPA_PM_ACTIVE); if (error) { dev_warn(dev, "set active power failed: %d\n", error); goto out; } } else { error = cyapa_reinitialize(cyapa); if (error || !cyapa->operational) { error = error ? error : -EAGAIN; goto out; } } enable_irq(client->irq); if (!pm_runtime_enabled(dev)) { pm_runtime_set_active(dev); pm_runtime_enable(dev); } pm_runtime_get_sync(dev); pm_runtime_mark_last_busy(dev); pm_runtime_put_sync_autosuspend(dev); out: mutex_unlock(&cyapa->state_sync_lock); return error; } static void cyapa_close(struct input_dev *input) { struct cyapa *cyapa = input_get_drvdata(input); struct i2c_client *client = cyapa->client; struct device *dev = &cyapa->client->dev; mutex_lock(&cyapa->state_sync_lock); disable_irq(client->irq); if (pm_runtime_enabled(dev)) pm_runtime_disable(dev); pm_runtime_set_suspended(dev); if (cyapa->operational) cyapa->ops->set_power_mode(cyapa, PWR_MODE_OFF, 0, CYAPA_PM_DEACTIVE); mutex_unlock(&cyapa->state_sync_lock); } static int cyapa_create_input_dev(struct cyapa *cyapa) { struct device *dev = &cyapa->client->dev; struct input_dev *input; int error; if (!cyapa->physical_size_x || !cyapa->physical_size_y) return -EINVAL; input = devm_input_allocate_device(dev); if (!input) { dev_err(dev, "failed to allocate memory for input device.\n"); return -ENOMEM; } input->name = CYAPA_NAME; input->phys = cyapa->phys; input->id.bustype = BUS_I2C; input->id.version = 1; input->id.product = 0; /* Means any product in eventcomm. */ input->dev.parent = &cyapa->client->dev; input->open = cyapa_open; input->close = cyapa_close; input_set_drvdata(input, cyapa); __set_bit(EV_ABS, input->evbit); /* Finger position */ input_set_abs_params(input, ABS_MT_POSITION_X, 0, cyapa->max_abs_x, 0, 0); input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cyapa->max_abs_y, 0, 0); input_set_abs_params(input, ABS_MT_PRESSURE, 0, cyapa->max_z, 0, 0); if (cyapa->gen > CYAPA_GEN3) { input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0); /* * Orientation is the angle between the vertical axis and * the major axis of the contact ellipse. * The range is -127 to 127. * the positive direction is clockwise form the vertical axis. * If the ellipse of contact degenerates into a circle, * orientation is reported as 0. * * Also, for Gen5 trackpad the accurate of this orientation * value is value + (-30 ~ 30). */ input_set_abs_params(input, ABS_MT_ORIENTATION, -127, 127, 0, 0); } if (cyapa->gen >= CYAPA_GEN5) { input_set_abs_params(input, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0); input_set_abs_params(input, ABS_MT_WIDTH_MINOR, 0, 255, 0, 0); input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0); } input_abs_set_res(input, ABS_MT_POSITION_X, cyapa->max_abs_x / cyapa->physical_size_x); input_abs_set_res(input, ABS_MT_POSITION_Y, cyapa->max_abs_y / cyapa->physical_size_y); if (cyapa->btn_capability & CAPABILITY_LEFT_BTN_MASK) __set_bit(BTN_LEFT, input->keybit); if (cyapa->btn_capability & CAPABILITY_MIDDLE_BTN_MASK) __set_bit(BTN_MIDDLE, input->keybit); if (cyapa->btn_capability & CAPABILITY_RIGHT_BTN_MASK) __set_bit(BTN_RIGHT, input->keybit); if (cyapa->btn_capability == CAPABILITY_LEFT_BTN_MASK) __set_bit(INPUT_PROP_BUTTONPAD, input->propbit); /* Handle pointer emulation and unused slots in core */ error = input_mt_init_slots(input, CYAPA_MAX_MT_SLOTS, INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED); if (error) { dev_err(dev, "failed to initialize MT slots: %d\n", error); return error; } /* Register the device in input subsystem */ error = input_register_device(input); if (error) { dev_err(dev, "failed to register input device: %d\n", error); return error; } cyapa->input = input; return 0; } static void cyapa_enable_irq_for_cmd(struct cyapa *cyapa) { struct input_dev *input = cyapa->input; if (!input || !input_device_enabled(input)) { /* * When input is NULL, TP must be in deep sleep mode. * In this mode, later non-power I2C command will always failed * if not bring it out of deep sleep mode firstly, * so must command TP to active mode here. */ if (!input || cyapa->operational) cyapa->ops->set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE, 0, CYAPA_PM_ACTIVE); /* Gen3 always using polling mode for command. */ if (cyapa->gen >= CYAPA_GEN5) enable_irq(cyapa->client->irq); } } static void cyapa_disable_irq_for_cmd(struct cyapa *cyapa) { struct input_dev *input = cyapa->input; if (!input || !input_device_enabled(input)) { if (cyapa->gen >= CYAPA_GEN5) disable_irq(cyapa->client->irq); if (!input || cyapa->operational) cyapa->ops->set_power_mode(cyapa, PWR_MODE_OFF, 0, CYAPA_PM_ACTIVE); } } /* * cyapa_sleep_time_to_pwr_cmd and cyapa_pwr_cmd_to_sleep_time * * These are helper functions that convert to and from integer idle * times and register settings to write to the PowerMode register. * The trackpad supports between 20ms to 1000ms scan intervals. * The time will be increased in increments of 10ms from 20ms to 100ms. * From 100ms to 1000ms, time will be increased in increments of 20ms. * * When Idle_Time < 100, the format to convert Idle_Time to Idle_Command is: * Idle_Command = Idle Time / 10; * When Idle_Time >= 100, the format to convert Idle_Time to Idle_Command is: * Idle_Command = Idle Time / 20 + 5; */ u8 cyapa_sleep_time_to_pwr_cmd(u16 sleep_time) { u16 encoded_time; sleep_time = clamp_val(sleep_time, 20, 1000); encoded_time = sleep_time < 100 ? sleep_time / 10 : sleep_time / 20 + 5; return (encoded_time << 2) & PWR_MODE_MASK; } u16 cyapa_pwr_cmd_to_sleep_time(u8 pwr_mode) { u8 encoded_time = pwr_mode >> 2; return (encoded_time < 10) ? encoded_time * 10 : (encoded_time - 5) * 20; } /* 0 on driver initialize and detected successfully, negative on failure. */ static int cyapa_initialize(struct cyapa *cyapa) { int error = 0; cyapa->state = CYAPA_STATE_NO_DEVICE; cyapa->gen = CYAPA_GEN_UNKNOWN; mutex_init(&cyapa->state_sync_lock); /* * Set to hard code default, they will be updated with trackpad set * default values after probe and initialized. */ cyapa->suspend_power_mode = PWR_MODE_SLEEP; cyapa->suspend_sleep_time = cyapa_pwr_cmd_to_sleep_time(cyapa->suspend_power_mode); /* ops.initialize() is aimed to prepare for module communications. */ error = cyapa_gen3_ops.initialize(cyapa); if (!error) error = cyapa_gen5_ops.initialize(cyapa); if (!error) error = cyapa_gen6_ops.initialize(cyapa); if (error) return error; error = cyapa_detect(cyapa); if (error) return error; /* Power down the device until we need it. */ if (cyapa->operational) cyapa->ops->set_power_mode(cyapa, PWR_MODE_OFF, 0, CYAPA_PM_ACTIVE); return 0; } static int cyapa_reinitialize(struct cyapa *cyapa) { struct device *dev = &cyapa->client->dev; struct input_dev *input = cyapa->input; int error; if (pm_runtime_enabled(dev)) pm_runtime_disable(dev); /* Avoid command failures when TP was in OFF state. */ if (cyapa->operational) cyapa->ops->set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE, 0, CYAPA_PM_ACTIVE); error = cyapa_detect(cyapa); if (error) goto out; if (!input && cyapa->operational) { error = cyapa_create_input_dev(cyapa); if (error) { dev_err(dev, "create input_dev instance failed: %d\n", error); goto out; } } out: if (!input || !input_device_enabled(input)) { /* Reset to power OFF state to save power when no user open. */ if (cyapa->operational) cyapa->ops->set_power_mode(cyapa, PWR_MODE_OFF, 0, CYAPA_PM_DEACTIVE); } else if (!error && cyapa->operational) { /* * Make sure only enable runtime PM when device is * in operational mode and input->users > 0. */ pm_runtime_set_active(dev); pm_runtime_enable(dev); pm_runtime_get_sync(dev); pm_runtime_mark_last_busy(dev); pm_runtime_put_sync_autosuspend(dev); } return error; } static irqreturn_t cyapa_irq(int irq, void *dev_id) { struct cyapa *cyapa = dev_id; struct device *dev = &cyapa->client->dev; int error; if (device_may_wakeup(dev)) pm_wakeup_event(dev, 0); /* Interrupt event can be caused by host command to trackpad device. */ if (cyapa->ops->irq_cmd_handler(cyapa)) { /* * Interrupt event maybe from trackpad device input reporting. */ if (!cyapa->input) { /* * Still in probing or in firmware image * updating or reading. */ cyapa->ops->sort_empty_output_data(cyapa, NULL, NULL, NULL); goto out; } if (cyapa->operational) { error = cyapa->ops->irq_handler(cyapa); /* * Apply runtime power management to touch report event * except the events caused by the command responses. * Note: * It will introduce about 20~40 ms additional delay * time in receiving for first valid touch report data. * The time is used to execute device runtime resume * process. */ pm_runtime_get_sync(dev); pm_runtime_mark_last_busy(dev); pm_runtime_put_sync_autosuspend(dev); } if (!cyapa->operational || error) { if (!mutex_trylock(&cyapa->state_sync_lock)) { cyapa->ops->sort_empty_output_data(cyapa, NULL, NULL, NULL); goto out; } cyapa_reinitialize(cyapa); mutex_unlock(&cyapa->state_sync_lock); } } out: return IRQ_HANDLED; } /* ************************************************************** * sysfs interface ************************************************************** */ #ifdef CONFIG_PM_SLEEP static ssize_t cyapa_show_suspend_scanrate(struct device *dev, struct device_attribute *attr, char *buf) { struct cyapa *cyapa = dev_get_drvdata(dev); u8 pwr_cmd; u16 sleep_time; int len; int error; error = mutex_lock_interruptible(&cyapa->state_sync_lock); if (error) return error; pwr_cmd = cyapa->suspend_power_mode; sleep_time = cyapa->suspend_sleep_time; mutex_unlock(&cyapa->state_sync_lock); switch (pwr_cmd) { case PWR_MODE_BTN_ONLY: len = scnprintf(buf, PAGE_SIZE, "%s\n", BTN_ONLY_MODE_NAME); break; case PWR_MODE_OFF: len = scnprintf(buf, PAGE_SIZE, "%s\n", OFF_MODE_NAME); break; default: len = scnprintf(buf, PAGE_SIZE, "%u\n", cyapa->gen == CYAPA_GEN3 ? cyapa_pwr_cmd_to_sleep_time(pwr_cmd) : sleep_time); break; } return len; } static ssize_t cyapa_update_suspend_scanrate(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct cyapa *cyapa = dev_get_drvdata(dev); u16 sleep_time; int error; error = mutex_lock_interruptible(&cyapa->state_sync_lock); if (error) return error; if (sysfs_streq(buf, BTN_ONLY_MODE_NAME)) { cyapa->suspend_power_mode = PWR_MODE_BTN_ONLY; } else if (sysfs_streq(buf, OFF_MODE_NAME)) { cyapa->suspend_power_mode = PWR_MODE_OFF; } else if (!kstrtou16(buf, 10, &sleep_time)) { cyapa->suspend_sleep_time = min_t(u16, sleep_time, 1000); cyapa->suspend_power_mode = cyapa_sleep_time_to_pwr_cmd(cyapa->suspend_sleep_time); } else { count = -EINVAL; } mutex_unlock(&cyapa->state_sync_lock); return count; } static DEVICE_ATTR(suspend_scanrate_ms, S_IRUGO|S_IWUSR, cyapa_show_suspend_scanrate, cyapa_update_suspend_scanrate); static struct attribute *cyapa_power_wakeup_entries[] = { &dev_attr_suspend_scanrate_ms.attr, NULL, }; static const struct attribute_group cyapa_power_wakeup_group = { .name = power_group_name, .attrs = cyapa_power_wakeup_entries, }; static void cyapa_remove_power_wakeup_group(void *data) { struct cyapa *cyapa = data; sysfs_unmerge_group(&cyapa->client->dev.kobj, &cyapa_power_wakeup_group); } static int cyapa_prepare_wakeup_controls(struct cyapa *cyapa) { struct i2c_client *client = cyapa->client; struct device *dev = &client->dev; int error; if (device_can_wakeup(dev)) { error = sysfs_merge_group(&dev->kobj, &cyapa_power_wakeup_group); if (error) { dev_err(dev, "failed to add power wakeup group: %d\n", error); return error; } error = devm_add_action_or_reset(dev, cyapa_remove_power_wakeup_group, cyapa); if (error) { dev_err(dev, "failed to add power cleanup action: %d\n", error); return error; } } return 0; } #else static inline int cyapa_prepare_wakeup_controls(struct cyapa *cyapa) { return 0; } #endif /* CONFIG_PM_SLEEP */ #ifdef CONFIG_PM static ssize_t cyapa_show_rt_suspend_scanrate(struct device *dev, struct device_attribute *attr, char *buf) { struct cyapa *cyapa = dev_get_drvdata(dev); u8 pwr_cmd; u16 sleep_time; int error; error = mutex_lock_interruptible(&cyapa->state_sync_lock); if (error) return error; pwr_cmd = cyapa->runtime_suspend_power_mode; sleep_time = cyapa->runtime_suspend_sleep_time; mutex_unlock(&cyapa->state_sync_lock); return scnprintf(buf, PAGE_SIZE, "%u\n", cyapa->gen == CYAPA_GEN3 ? cyapa_pwr_cmd_to_sleep_time(pwr_cmd) : sleep_time); } static ssize_t cyapa_update_rt_suspend_scanrate(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct cyapa *cyapa = dev_get_drvdata(dev); u16 time; int error; if (buf == NULL || count == 0 || kstrtou16(buf, 10, &time)) { dev_err(dev, "invalid runtime suspend scanrate ms parameter\n"); return -EINVAL; } /* * When the suspend scanrate is changed, pm_runtime_get to resume * a potentially suspended device, update to the new pwr_cmd * and then pm_runtime_put to suspend into the new power mode. */ pm_runtime_get_sync(dev); error = mutex_lock_interruptible(&cyapa->state_sync_lock); if (error) return error; cyapa->runtime_suspend_sleep_time = min_t(u16, time, 1000); cyapa->runtime_suspend_power_mode = cyapa_sleep_time_to_pwr_cmd(cyapa->runtime_suspend_sleep_time); mutex_unlock(&cyapa->state_sync_lock); pm_runtime_put_sync_autosuspend(dev); return count; } static DEVICE_ATTR(runtime_suspend_scanrate_ms, S_IRUGO|S_IWUSR, cyapa_show_rt_suspend_scanrate, cyapa_update_rt_suspend_scanrate); static struct attribute *cyapa_power_runtime_entries[] = { &dev_attr_runtime_suspend_scanrate_ms.attr, NULL, }; static const struct attribute_group cyapa_power_runtime_group = { .name = power_group_name, .attrs = cyapa_power_runtime_entries, }; static void cyapa_remove_power_runtime_group(void *data) { struct cyapa *cyapa = data; sysfs_unmerge_group(&cyapa->client->dev.kobj, &cyapa_power_runtime_group); } static int cyapa_start_runtime(struct cyapa *cyapa) { struct device *dev = &cyapa->client->dev; int error; cyapa->runtime_suspend_power_mode = PWR_MODE_IDLE; cyapa->runtime_suspend_sleep_time = cyapa_pwr_cmd_to_sleep_time(cyapa->runtime_suspend_power_mode); error = sysfs_merge_group(&dev->kobj, &cyapa_power_runtime_group); if (error) { dev_err(dev, "failed to create power runtime group: %d\n", error); return error; } error = devm_add_action_or_reset(dev, cyapa_remove_power_runtime_group, cyapa); if (error) { dev_err(dev, "failed to add power runtime cleanup action: %d\n", error); return error; } /* runtime is enabled until device is operational and opened. */ pm_runtime_set_suspended(dev); pm_runtime_use_autosuspend(dev); pm_runtime_set_autosuspend_delay(dev, AUTOSUSPEND_DELAY); return 0; } #else static inline int cyapa_start_runtime(struct cyapa *cyapa) { return 0; } #endif /* CONFIG_PM */ static ssize_t cyapa_show_fm_ver(struct device *dev, struct device_attribute *attr, char *buf) { int error; struct cyapa *cyapa = dev_get_drvdata(dev); error = mutex_lock_interruptible(&cyapa->state_sync_lock); if (error) return error; error = scnprintf(buf, PAGE_SIZE, "%d.%d\n", cyapa->fw_maj_ver, cyapa->fw_min_ver); mutex_unlock(&cyapa->state_sync_lock); return error; } static ssize_t cyapa_show_product_id(struct device *dev, struct device_attribute *attr, char *buf) { struct cyapa *cyapa = dev_get_drvdata(dev); int size; int error; error = mutex_lock_interruptible(&cyapa->state_sync_lock); if (error) return error; size = scnprintf(buf, PAGE_SIZE, "%s\n", cyapa->product_id); mutex_unlock(&cyapa->state_sync_lock); return size; } static int cyapa_firmware(struct cyapa *cyapa, const char *fw_name) { struct device *dev = &cyapa->client->dev; const struct firmware *fw; int error; error = request_firmware(&fw, fw_name, dev); if (error) { dev_err(dev, "Could not load firmware from %s: %d\n", fw_name, error); return error; } error = cyapa->ops->check_fw(cyapa, fw); if (error) { dev_err(dev, "Invalid CYAPA firmware image: %s\n", fw_name); goto done; } /* * Resume the potentially suspended device because doing FW * update on a device not in the FULL mode has a chance to * fail. */ pm_runtime_get_sync(dev); /* Require IRQ support for firmware update commands. */ cyapa_enable_irq_for_cmd(cyapa); error = cyapa->ops->bl_enter(cyapa); if (error) { dev_err(dev, "bl_enter failed, %d\n", error); goto err_detect; } error = cyapa->ops->bl_activate(cyapa); if (error) { dev_err(dev, "bl_activate failed, %d\n", error); goto err_detect; } error = cyapa->ops->bl_initiate(cyapa, fw); if (error) { dev_err(dev, "bl_initiate failed, %d\n", error); goto err_detect; } error = cyapa->ops->update_fw(cyapa, fw); if (error) { dev_err(dev, "update_fw failed, %d\n", error); goto err_detect; } err_detect: cyapa_disable_irq_for_cmd(cyapa); pm_runtime_put_noidle(dev); done: release_firmware(fw); return error; } static ssize_t cyapa_update_fw_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct cyapa *cyapa = dev_get_drvdata(dev); char fw_name[NAME_MAX]; int ret, error; if (count >= NAME_MAX) { dev_err(dev, "File name too long\n"); return -EINVAL; } memcpy(fw_name, buf, count); if (fw_name[count - 1] == '\n') fw_name[count - 1] = '\0'; else fw_name[count] = '\0'; if (cyapa->input) { /* * Force the input device to be registered after the firmware * image is updated, so if the corresponding parameters updated * in the new firmware image can taken effect immediately. */ input_unregister_device(cyapa->input); cyapa->input = NULL; } error = mutex_lock_interruptible(&cyapa->state_sync_lock); if (error) { /* * Whatever, do reinitialize to try to recover TP state to * previous state just as it entered fw update entrance. */ cyapa_reinitialize(cyapa); return error; } error = cyapa_firmware(cyapa, fw_name); if (error) dev_err(dev, "firmware update failed: %d\n", error); else dev_dbg(dev, "firmware update successfully done.\n"); /* * Re-detect trackpad device states because firmware update process * will reset trackpad device into bootloader mode. */ ret = cyapa_reinitialize(cyapa); if (ret) { dev_err(dev, "failed to re-detect after updated: %d\n", ret); error = error ? error : ret; } mutex_unlock(&cyapa->state_sync_lock); return error ? error : count; } static ssize_t cyapa_calibrate_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct cyapa *cyapa = dev_get_drvdata(dev); int error; error = mutex_lock_interruptible(&cyapa->state_sync_lock); if (error) return error; if (cyapa->operational) { cyapa_enable_irq_for_cmd(cyapa); error = cyapa->ops->calibrate_store(dev, attr, buf, count); cyapa_disable_irq_for_cmd(cyapa); } else { error = -EBUSY; /* Still running in bootloader mode. */ } mutex_unlock(&cyapa->state_sync_lock); return error < 0 ? error : count; } static ssize_t cyapa_show_baseline(struct device *dev, struct device_attribute *attr, char *buf) { struct cyapa *cyapa = dev_get_drvdata(dev); ssize_t error; error = mutex_lock_interruptible(&cyapa->state_sync_lock); if (error) return error; if (cyapa->operational) { cyapa_enable_irq_for_cmd(cyapa); error = cyapa->ops->show_baseline(dev, attr, buf); cyapa_disable_irq_for_cmd(cyapa); } else { error = -EBUSY; /* Still running in bootloader mode. */ } mutex_unlock(&cyapa->state_sync_lock); return error; } static char *cyapa_state_to_string(struct cyapa *cyapa) { switch (cyapa->state) { case CYAPA_STATE_BL_BUSY: return "bootloader busy"; case CYAPA_STATE_BL_IDLE: return "bootloader idle"; case CYAPA_STATE_BL_ACTIVE: return "bootloader active"; case CYAPA_STATE_GEN5_BL: case CYAPA_STATE_GEN6_BL: return "bootloader"; case CYAPA_STATE_OP: case CYAPA_STATE_GEN5_APP: case CYAPA_STATE_GEN6_APP: return "operational"; /* Normal valid state. */ default: return "invalid mode"; } } static ssize_t cyapa_show_mode(struct device *dev, struct device_attribute *attr, char *buf) { struct cyapa *cyapa = dev_get_drvdata(dev); int size; int error; error = mutex_lock_interruptible(&cyapa->state_sync_lock); if (error) return error; size = scnprintf(buf, PAGE_SIZE, "gen%d %s\n", cyapa->gen, cyapa_state_to_string(cyapa)); mutex_unlock(&cyapa->state_sync_lock); return size; } static DEVICE_ATTR(firmware_version, S_IRUGO, cyapa_show_fm_ver, NULL); static DEVICE_ATTR(product_id, S_IRUGO, cyapa_show_product_id, NULL); static DEVICE_ATTR(update_fw, S_IWUSR, NULL, cyapa_update_fw_store); static DEVICE_ATTR(baseline, S_IRUGO, cyapa_show_baseline, NULL); static DEVICE_ATTR(calibrate, S_IWUSR, NULL, cyapa_calibrate_store); static DEVICE_ATTR(mode, S_IRUGO, cyapa_show_mode, NULL); static struct attribute *cyapa_sysfs_entries[] = { &dev_attr_firmware_version.attr, &dev_attr_product_id.attr, &dev_attr_update_fw.attr, &dev_attr_baseline.attr, &dev_attr_calibrate.attr, &dev_attr_mode.attr, NULL, }; static const struct attribute_group cyapa_sysfs_group = { .attrs = cyapa_sysfs_entries, }; static void cyapa_disable_regulator(void *data) { struct cyapa *cyapa = data; regulator_disable(cyapa->vcc); } static int cyapa_probe(struct i2c_client *client) { struct device *dev = &client->dev; struct cyapa *cyapa; u8 adapter_func; union i2c_smbus_data dummy; int error; adapter_func = cyapa_check_adapter_functionality(client); if (adapter_func == CYAPA_ADAPTER_FUNC_NONE) { dev_err(dev, "not a supported I2C/SMBus adapter\n"); return -EIO; } /* Make sure there is something at this address */ if (i2c_smbus_xfer(client->adapter, client->addr, 0, I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) return -ENODEV; cyapa = devm_kzalloc(dev, sizeof(struct cyapa), GFP_KERNEL); if (!cyapa) return -ENOMEM; /* i2c isn't supported, use smbus */ if (adapter_func == CYAPA_ADAPTER_FUNC_SMBUS) cyapa->smbus = true; cyapa->client = client; i2c_set_clientdata(client, cyapa); sprintf(cyapa->phys, "i2c-%d-%04x/input0", client->adapter->nr, client->addr); cyapa->vcc = devm_regulator_get(dev, "vcc"); if (IS_ERR(cyapa->vcc)) { error = PTR_ERR(cyapa->vcc); dev_err(dev, "failed to get vcc regulator: %d\n", error); return error; } error = regulator_enable(cyapa->vcc); if (error) { dev_err(dev, "failed to enable regulator: %d\n", error); return error; } error = devm_add_action_or_reset(dev, cyapa_disable_regulator, cyapa); if (error) { dev_err(dev, "failed to add disable regulator action: %d\n", error); return error; } error = cyapa_initialize(cyapa); if (error) { dev_err(dev, "failed to detect and initialize tp device.\n"); return error; } error = devm_device_add_group(dev, &cyapa_sysfs_group); if (error) { dev_err(dev, "failed to create sysfs entries: %d\n", error); return error; } error = cyapa_prepare_wakeup_controls(cyapa); if (error) { dev_err(dev, "failed to prepare wakeup controls: %d\n", error); return error; } error = cyapa_start_runtime(cyapa); if (error) { dev_err(dev, "failed to start pm_runtime: %d\n", error); return error; } error = devm_request_threaded_irq(dev, client->irq, NULL, cyapa_irq, IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "cyapa", cyapa); if (error) { dev_err(dev, "failed to request threaded irq: %d\n", error); return error; } /* Disable IRQ until the device is opened */ disable_irq(client->irq); /* * Register the device in the input subsystem when it's operational. * Otherwise, keep in this driver, so it can be be recovered or updated * through the sysfs mode and update_fw interfaces by user or apps. */ if (cyapa->operational) { error = cyapa_create_input_dev(cyapa); if (error) { dev_err(dev, "create input_dev instance failed: %d\n", error); return error; } } return 0; } static int cyapa_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct cyapa *cyapa = i2c_get_clientdata(client); u8 power_mode; int error; error = mutex_lock_interruptible(&cyapa->state_sync_lock); if (error) return error; /* * Runtime PM is enable only when device is in operational mode and * users in use, so need check it before disable it to * avoid unbalance warning. */ if (pm_runtime_enabled(dev)) pm_runtime_disable(dev); disable_irq(client->irq); /* * Set trackpad device to idle mode if wakeup is allowed, * otherwise turn off. */ if (cyapa->operational) { power_mode = device_may_wakeup(dev) ? cyapa->suspend_power_mode : PWR_MODE_OFF; error = cyapa->ops->set_power_mode(cyapa, power_mode, cyapa->suspend_sleep_time, CYAPA_PM_SUSPEND); if (error) dev_err(dev, "suspend set power mode failed: %d\n", error); } /* * Disable proximity interrupt when system idle, want true touch to * wake the system. */ if (cyapa->dev_pwr_mode != PWR_MODE_OFF) cyapa->ops->set_proximity(cyapa, false); if (device_may_wakeup(dev)) cyapa->irq_wake = (enable_irq_wake(client->irq) == 0); mutex_unlock(&cyapa->state_sync_lock); return 0; } static int cyapa_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct cyapa *cyapa = i2c_get_clientdata(client); int error; mutex_lock(&cyapa->state_sync_lock); if (device_may_wakeup(dev) && cyapa->irq_wake) { disable_irq_wake(client->irq); cyapa->irq_wake = false; } /* * Update device states and runtime PM states. * Re-Enable proximity interrupt after enter operational mode. */ error = cyapa_reinitialize(cyapa); if (error) dev_warn(dev, "failed to reinitialize TP device: %d\n", error); enable_irq(client->irq); mutex_unlock(&cyapa->state_sync_lock); return 0; } static int cyapa_runtime_suspend(struct device *dev) { struct cyapa *cyapa = dev_get_drvdata(dev); int error; error = cyapa->ops->set_power_mode(cyapa, cyapa->runtime_suspend_power_mode, cyapa->runtime_suspend_sleep_time, CYAPA_PM_RUNTIME_SUSPEND); if (error) dev_warn(dev, "runtime suspend failed: %d\n", error); return 0; } static int cyapa_runtime_resume(struct device *dev) { struct cyapa *cyapa = dev_get_drvdata(dev); int error; error = cyapa->ops->set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE, 0, CYAPA_PM_RUNTIME_RESUME); if (error) dev_warn(dev, "runtime resume failed: %d\n", error); return 0; } static const struct dev_pm_ops cyapa_pm_ops = { SYSTEM_SLEEP_PM_OPS(cyapa_suspend, cyapa_resume) RUNTIME_PM_OPS(cyapa_runtime_suspend, cyapa_runtime_resume, NULL) }; static const struct i2c_device_id cyapa_id_table[] = { { "cyapa", 0 }, { }, }; MODULE_DEVICE_TABLE(i2c, cyapa_id_table); #ifdef CONFIG_ACPI static const struct acpi_device_id cyapa_acpi_id[] = { { "CYAP0000", 0 }, /* Gen3 trackpad with 0x67 I2C address. */ { "CYAP0001", 0 }, /* Gen5 trackpad with 0x24 I2C address. */ { "CYAP0002", 0 }, /* Gen6 trackpad with 0x24 I2C address. */ { } }; MODULE_DEVICE_TABLE(acpi, cyapa_acpi_id); #endif #ifdef CONFIG_OF static const struct of_device_id cyapa_of_match[] = { { .compatible = "cypress,cyapa" }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, cyapa_of_match); #endif static struct i2c_driver cyapa_driver = { .driver = { .name = "cyapa", .pm = pm_ptr(&cyapa_pm_ops), .acpi_match_table = ACPI_PTR(cyapa_acpi_id), .of_match_table = of_match_ptr(cyapa_of_match), }, .probe = cyapa_probe, .id_table = cyapa_id_table, }; module_i2c_driver(cyapa_driver); MODULE_DESCRIPTION("Cypress APA I2C Trackpad Driver"); MODULE_AUTHOR("Dudley Du <dudl@cypress.com>"); MODULE_LICENSE("GPL");
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