| Message ID | 1476373872-18027-8-git-send-email-benjamin.tissoires@redhat.com (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
On Thu, Oct 13, 2016 at 05:51:01PM +0200, Benjamin Tissoires wrote: > Code obtained from https://raw.githubusercontent.com/mightybigcar/synaptics-rmi4/jf/drivers/input/rmi4/rmi_smbus.c > and updated to match upstream. And fixed to make it work. > > Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> > Signed-off-by: Andrew Duggan <aduggan@synaptics.com> Applied, thank you. > > --- > > changes in v3: > - use of irq for Host Notify, not alert > - forward the irq to rmi_core and let it handling it > > no changes in v2 > > Changes in v1 of this series: > - rely on PM functions for resume handling > > Changes from the Host Notify series: > new in v5 > > no changes in v6 > > changes in v7: > - fixed typos as per Andrew's requests > - changed module author from Allie to Andrew as per Andrew's request > - add suspend/resume callbacks to match upstream rmi4 behavior > > no changes in v8 > --- > drivers/input/rmi4/Kconfig | 12 ++ > drivers/input/rmi4/Makefile | 1 + > drivers/input/rmi4/rmi_bus.h | 12 ++ > drivers/input/rmi4/rmi_smbus.c | 448 +++++++++++++++++++++++++++++++++++++++++ > 4 files changed, 473 insertions(+) > create mode 100644 drivers/input/rmi4/rmi_smbus.c > > diff --git a/drivers/input/rmi4/Kconfig b/drivers/input/rmi4/Kconfig > index 4c8a558..8cbd362 100644 > --- a/drivers/input/rmi4/Kconfig > +++ b/drivers/input/rmi4/Kconfig > @@ -27,6 +27,18 @@ config RMI4_SPI > > If unsure, say N. > > +config RMI4_SMB > + tristate "RMI4 SMB Support" > + depends on RMI4_CORE && I2C > + help > + Say Y here if you want to support RMI4 devices connected to an SMB > + bus. > + > + If unsure, say N. > + > + To compile this driver as a module, choose M here: the module will be > + called rmi_smbus. > + > config RMI4_2D_SENSOR > bool > depends on RMI4_CORE > diff --git a/drivers/input/rmi4/Makefile b/drivers/input/rmi4/Makefile > index 0bafc85..a6e2752 100644 > --- a/drivers/input/rmi4/Makefile > +++ b/drivers/input/rmi4/Makefile > @@ -12,3 +12,4 @@ rmi_core-$(CONFIG_RMI4_F54) += rmi_f54.o > # Transports > obj-$(CONFIG_RMI4_I2C) += rmi_i2c.o > obj-$(CONFIG_RMI4_SPI) += rmi_spi.o > +obj-$(CONFIG_RMI4_SMB) += rmi_smbus.o > diff --git a/drivers/input/rmi4/rmi_bus.h b/drivers/input/rmi4/rmi_bus.h > index 8995798..b7625a9 100644 > --- a/drivers/input/rmi4/rmi_bus.h > +++ b/drivers/input/rmi4/rmi_bus.h > @@ -105,6 +105,18 @@ rmi_get_platform_data(struct rmi_device *d) > bool rmi_is_physical_device(struct device *dev); > > /** > + * rmi_reset - reset a RMI4 device > + * @d: Pointer to an RMI device > + * > + * Calls for a reset of each function implemented by a specific device. > + * Returns 0 on success or a negative error code. > + */ > +static inline int rmi_reset(struct rmi_device *d) > +{ > + return d->driver->reset_handler(d); > +} > + > +/** > * rmi_read - read a single byte > * @d: Pointer to an RMI device > * @addr: The address to read from > diff --git a/drivers/input/rmi4/rmi_smbus.c b/drivers/input/rmi4/rmi_smbus.c > new file mode 100644 > index 0000000..96ad325 > --- /dev/null > +++ b/drivers/input/rmi4/rmi_smbus.c > @@ -0,0 +1,448 @@ > +/* > + * Copyright (c) 2015 - 2016 Red Hat, Inc > + * Copyright (c) 2011, 2012 Synaptics Incorporated > + * Copyright (c) 2011 Unixphere > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License version 2 as published by > + * the Free Software Foundation. > + */ > + > +#include <linux/kernel.h> > +#include <linux/delay.h> > +#include <linux/i2c.h> > +#include <linux/interrupt.h> > +#include <linux/kconfig.h> > +#include <linux/lockdep.h> > +#include <linux/module.h> > +#include <linux/pm.h> > +#include <linux/rmi.h> > +#include <linux/slab.h> > +#include "rmi_driver.h" > + > +#define SMB_PROTOCOL_VERSION_ADDRESS 0xfd > +#define SMB_MAX_COUNT 32 > +#define RMI_SMB2_MAP_SIZE 8 /* 8 entry of 4 bytes each */ > +#define RMI_SMB2_MAP_FLAGS_WE 0x01 > + > +struct mapping_table_entry { > + __le16 rmiaddr; > + u8 readcount; > + u8 flags; > +}; > + > +struct rmi_smb_xport { > + struct rmi_transport_dev xport; > + struct i2c_client *client; > + > + struct mutex page_mutex; > + int page; > + u8 table_index; > + struct mutex mappingtable_mutex; > + struct mapping_table_entry mapping_table[RMI_SMB2_MAP_SIZE]; > +}; > + > +static int rmi_smb_get_version(struct rmi_smb_xport *rmi_smb) > +{ > + struct i2c_client *client = rmi_smb->client; > + int retval; > + > + /* Check if for SMBus new version device by reading version byte. */ > + retval = i2c_smbus_read_byte_data(client, SMB_PROTOCOL_VERSION_ADDRESS); > + if (retval < 0) { > + dev_err(&client->dev, "failed to get SMBus version number!\n"); > + return retval; > + } > + return retval + 1; > +} > + > +/* SMB block write - wrapper over ic2_smb_write_block */ > +static int smb_block_write(struct rmi_transport_dev *xport, > + u8 commandcode, const void *buf, size_t len) > +{ > + struct rmi_smb_xport *rmi_smb = > + container_of(xport, struct rmi_smb_xport, xport); > + struct i2c_client *client = rmi_smb->client; > + int retval; > + > + retval = i2c_smbus_write_block_data(client, commandcode, len, buf); > + > + rmi_dbg(RMI_DEBUG_XPORT, &client->dev, > + "wrote %zd bytes at %#04x: %d (%*ph)\n", > + len, commandcode, retval, (int)len, buf); > + > + return retval; > +} > + > +/* > + * The function to get command code for smbus operations and keeps > + * records to the driver mapping table > + */ > +static int rmi_smb_get_command_code(struct rmi_transport_dev *xport, > + u16 rmiaddr, int bytecount, bool isread, u8 *commandcode) > +{ > + struct rmi_smb_xport *rmi_smb = > + container_of(xport, struct rmi_smb_xport, xport); > + int i; > + int retval; > + struct mapping_table_entry mapping_data[1]; > + > + mutex_lock(&rmi_smb->mappingtable_mutex); > + for (i = 0; i < RMI_SMB2_MAP_SIZE; i++) { > + if (rmi_smb->mapping_table[i].rmiaddr == rmiaddr) { > + if (isread) { > + if (rmi_smb->mapping_table[i].readcount > + == bytecount) { > + *commandcode = i; > + retval = 0; > + goto exit; > + } > + } else { > + if (rmi_smb->mapping_table[i].flags & > + RMI_SMB2_MAP_FLAGS_WE) { > + *commandcode = i; > + retval = 0; > + goto exit; > + } > + } > + } > + } > + i = rmi_smb->table_index; > + rmi_smb->table_index = (i + 1) % RMI_SMB2_MAP_SIZE; > + > + /* constructs mapping table data entry. 4 bytes each entry */ > + memset(mapping_data, 0, sizeof(mapping_data)); > + > + mapping_data[0].rmiaddr = cpu_to_le16(rmiaddr); > + mapping_data[0].readcount = bytecount; > + mapping_data[0].flags = !isread ? RMI_SMB2_MAP_FLAGS_WE : 0; > + > + retval = smb_block_write(xport, i + 0x80, mapping_data, > + sizeof(mapping_data)); > + > + if (retval < 0) { > + /* > + * if not written to device mapping table > + * clear the driver mapping table records > + */ > + rmi_smb->mapping_table[i].rmiaddr = 0x0000; > + rmi_smb->mapping_table[i].readcount = 0; > + rmi_smb->mapping_table[i].flags = 0; > + goto exit; > + } > + /* save to the driver level mapping table */ > + rmi_smb->mapping_table[i].rmiaddr = rmiaddr; > + rmi_smb->mapping_table[i].readcount = bytecount; > + rmi_smb->mapping_table[i].flags = !isread ? RMI_SMB2_MAP_FLAGS_WE : 0; > + *commandcode = i; > + > +exit: > + mutex_unlock(&rmi_smb->mappingtable_mutex); > + > + return retval; > +} > + > +static int rmi_smb_write_block(struct rmi_transport_dev *xport, u16 rmiaddr, > + const void *databuff, size_t len) > +{ > + int retval = 0; > + u8 commandcode; > + struct rmi_smb_xport *rmi_smb = > + container_of(xport, struct rmi_smb_xport, xport); > + int cur_len = (int)len; > + > + mutex_lock(&rmi_smb->page_mutex); > + > + while (cur_len > 0) { > + /* > + * break into 32 bytes chunks to write get command code > + */ > + int block_len = min_t(int, len, SMB_MAX_COUNT); > + > + retval = rmi_smb_get_command_code(xport, rmiaddr, block_len, > + false, &commandcode); > + if (retval < 0) > + goto exit; > + > + retval = smb_block_write(xport, commandcode, > + databuff, block_len); > + if (retval < 0) > + goto exit; > + > + /* prepare to write next block of bytes */ > + cur_len -= SMB_MAX_COUNT; > + databuff += SMB_MAX_COUNT; > + rmiaddr += SMB_MAX_COUNT; > + } > +exit: > + mutex_unlock(&rmi_smb->page_mutex); > + return retval; > +} > + > +/* SMB block read - wrapper over ic2_smb_read_block */ > +static int smb_block_read(struct rmi_transport_dev *xport, > + u8 commandcode, void *buf, size_t len) > +{ > + struct rmi_smb_xport *rmi_smb = > + container_of(xport, struct rmi_smb_xport, xport); > + struct i2c_client *client = rmi_smb->client; > + int retval; > + > + retval = i2c_smbus_read_block_data(client, commandcode, buf); > + if (retval < 0) > + return retval; > + > + return retval; > +} > + > +static int rmi_smb_read_block(struct rmi_transport_dev *xport, u16 rmiaddr, > + void *databuff, size_t len) > +{ > + struct rmi_smb_xport *rmi_smb = > + container_of(xport, struct rmi_smb_xport, xport); > + int retval; > + u8 commandcode; > + int cur_len = (int)len; > + > + mutex_lock(&rmi_smb->page_mutex); > + memset(databuff, 0, len); > + > + while (cur_len > 0) { > + /* break into 32 bytes chunks to write get command code */ > + int block_len = min_t(int, cur_len, SMB_MAX_COUNT); > + > + retval = rmi_smb_get_command_code(xport, rmiaddr, block_len, > + true, &commandcode); > + if (retval < 0) > + goto exit; > + > + retval = smb_block_read(xport, commandcode, > + databuff, block_len); > + if (retval < 0) > + goto exit; > + > + /* prepare to read next block of bytes */ > + cur_len -= SMB_MAX_COUNT; > + databuff += SMB_MAX_COUNT; > + rmiaddr += SMB_MAX_COUNT; > + } > + > + retval = 0; > + > +exit: > + mutex_unlock(&rmi_smb->page_mutex); > + return retval; > +} > + > +static void rmi_smb_clear_state(struct rmi_smb_xport *rmi_smb) > +{ > + /* the mapping table has been flushed, discard the current one */ > + mutex_lock(&rmi_smb->mappingtable_mutex); > + memset(rmi_smb->mapping_table, 0, sizeof(rmi_smb->mapping_table)); > + mutex_unlock(&rmi_smb->mappingtable_mutex); > +} > + > +static int rmi_smb_enable_smbus_mode(struct rmi_smb_xport *rmi_smb) > +{ > + int retval; > + > + /* we need to get the smbus version to activate the touchpad */ > + retval = rmi_smb_get_version(rmi_smb); > + if (retval < 0) > + return retval; > + > + return 0; > +} > + > +static int rmi_smb_reset(struct rmi_transport_dev *xport, u16 reset_addr) > +{ > + struct rmi_smb_xport *rmi_smb = > + container_of(xport, struct rmi_smb_xport, xport); > + > + rmi_smb_clear_state(rmi_smb); > + > + /* > + * we do not call the actual reset command, it has to be handled in > + * PS/2 or there will be races between PS/2 and SMBus. > + * PS/2 should ensure that a psmouse_reset is called before > + * intializing the device and after it has been removed to be in a known > + * state. > + */ > + return rmi_smb_enable_smbus_mode(rmi_smb); > +} > + > +static const struct rmi_transport_ops rmi_smb_ops = { > + .write_block = rmi_smb_write_block, > + .read_block = rmi_smb_read_block, > + .reset = rmi_smb_reset, > +}; > + > +static int rmi_smb_probe(struct i2c_client *client, > + const struct i2c_device_id *id) > +{ > + struct rmi_device_platform_data *pdata = dev_get_platdata(&client->dev); > + struct rmi_smb_xport *rmi_smb; > + int retval; > + int smbus_version; > + > + if (!i2c_check_functionality(client->adapter, > + I2C_FUNC_SMBUS_READ_BLOCK_DATA | > + I2C_FUNC_SMBUS_HOST_NOTIFY)) { > + dev_err(&client->dev, > + "adapter does not support required functionality.\n"); > + return -ENODEV; > + } > + > + if (client->irq <= 0) { > + dev_err(&client->dev, "no IRQ provided, giving up.\n"); > + return client->irq ? client->irq : -ENODEV; > + } > + > + rmi_smb = devm_kzalloc(&client->dev, sizeof(struct rmi_smb_xport), > + GFP_KERNEL); > + if (!rmi_smb) > + return -ENOMEM; > + > + if (!pdata) { > + dev_err(&client->dev, "no platform data, aborting\n"); > + return -ENOMEM; > + } > + > + rmi_dbg(RMI_DEBUG_XPORT, &client->dev, "Probing %s.\n", > + dev_name(&client->dev)); > + > + rmi_smb->client = client; > + mutex_init(&rmi_smb->page_mutex); > + mutex_init(&rmi_smb->mappingtable_mutex); > + > + rmi_smb->xport.dev = &client->dev; > + rmi_smb->xport.pdata = *pdata; > + rmi_smb->xport.pdata.irq = client->irq; > + rmi_smb->xport.proto_name = "smb2"; > + rmi_smb->xport.ops = &rmi_smb_ops; > + > + retval = rmi_smb_get_version(rmi_smb); > + if (retval < 0) > + return retval; > + > + smbus_version = retval; > + rmi_dbg(RMI_DEBUG_XPORT, &client->dev, "Smbus version is %d", > + smbus_version); > + > + if (smbus_version != 2) { > + dev_err(&client->dev, "Unrecognized SMB version %d.\n", > + smbus_version); > + return -ENODEV; > + } > + > + i2c_set_clientdata(client, rmi_smb); > + > + retval = rmi_register_transport_device(&rmi_smb->xport); > + if (retval) { > + dev_err(&client->dev, "Failed to register transport driver at 0x%.2X.\n", > + client->addr); > + i2c_set_clientdata(client, NULL); > + return retval; > + } > + > + dev_info(&client->dev, "registered rmi smb driver at %#04x.\n", > + client->addr); > + return 0; > + > +} > + > +static int rmi_smb_remove(struct i2c_client *client) > +{ > + struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client); > + > + rmi_unregister_transport_device(&rmi_smb->xport); > + > + return 0; > +} > + > +static int __maybe_unused rmi_smb_suspend(struct device *dev) > +{ > + struct i2c_client *client = to_i2c_client(dev); > + struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client); > + int ret; > + > + ret = rmi_driver_suspend(rmi_smb->xport.rmi_dev, true); > + if (ret) > + dev_warn(dev, "Failed to suspend device: %d\n", ret); > + > + return ret; > +} > + > +static int __maybe_unused rmi_smb_runtime_suspend(struct device *dev) > +{ > + struct i2c_client *client = to_i2c_client(dev); > + struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client); > + int ret; > + > + ret = rmi_driver_suspend(rmi_smb->xport.rmi_dev, false); > + if (ret) > + dev_warn(dev, "Failed to suspend device: %d\n", ret); > + > + return ret; > +} > + > +static int __maybe_unused rmi_smb_resume(struct device *dev) > +{ > + struct i2c_client *client = container_of(dev, struct i2c_client, dev); > + struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client); > + struct rmi_device *rmi_dev = rmi_smb->xport.rmi_dev; > + int ret; > + > + rmi_smb_reset(&rmi_smb->xport, 0); > + > + rmi_reset(rmi_dev); > + > + ret = rmi_driver_resume(rmi_smb->xport.rmi_dev, true); > + if (ret) > + dev_warn(dev, "Failed to resume device: %d\n", ret); > + > + return 0; > +} > + > +static int __maybe_unused rmi_smb_runtime_resume(struct device *dev) > +{ > + struct i2c_client *client = to_i2c_client(dev); > + struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client); > + int ret; > + > + ret = rmi_driver_resume(rmi_smb->xport.rmi_dev, false); > + if (ret) > + dev_warn(dev, "Failed to resume device: %d\n", ret); > + > + return 0; > +} > + > +static const struct dev_pm_ops rmi_smb_pm = { > + SET_SYSTEM_SLEEP_PM_OPS(rmi_smb_suspend, rmi_smb_resume) > + SET_RUNTIME_PM_OPS(rmi_smb_runtime_suspend, rmi_smb_runtime_resume, > + NULL) > +}; > + > +static const struct i2c_device_id rmi_id[] = { > + { "rmi4_smbus", 0 }, > + { } > +}; > +MODULE_DEVICE_TABLE(i2c, rmi_id); > + > +static struct i2c_driver rmi_smb_driver = { > + .driver = { > + .owner = THIS_MODULE, > + .name = "rmi4_smbus", > + .pm = &rmi_smb_pm, > + }, > + .id_table = rmi_id, > + .probe = rmi_smb_probe, > + .remove = rmi_smb_remove, > +}; > + > +module_i2c_driver(rmi_smb_driver); > + > +MODULE_AUTHOR("Andrew Duggan <aduggan@synaptics.com>"); > +MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@redhat.com>"); > +MODULE_DESCRIPTION("RMI4 SMBus driver"); > +MODULE_LICENSE("GPL"); > -- > 2.7.4 >
diff --git a/drivers/input/rmi4/Kconfig b/drivers/input/rmi4/Kconfig index 4c8a558..8cbd362 100644 --- a/drivers/input/rmi4/Kconfig +++ b/drivers/input/rmi4/Kconfig @@ -27,6 +27,18 @@ config RMI4_SPI If unsure, say N. +config RMI4_SMB + tristate "RMI4 SMB Support" + depends on RMI4_CORE && I2C + help + Say Y here if you want to support RMI4 devices connected to an SMB + bus. + + If unsure, say N. + + To compile this driver as a module, choose M here: the module will be + called rmi_smbus. + config RMI4_2D_SENSOR bool depends on RMI4_CORE diff --git a/drivers/input/rmi4/Makefile b/drivers/input/rmi4/Makefile index 0bafc85..a6e2752 100644 --- a/drivers/input/rmi4/Makefile +++ b/drivers/input/rmi4/Makefile @@ -12,3 +12,4 @@ rmi_core-$(CONFIG_RMI4_F54) += rmi_f54.o # Transports obj-$(CONFIG_RMI4_I2C) += rmi_i2c.o obj-$(CONFIG_RMI4_SPI) += rmi_spi.o +obj-$(CONFIG_RMI4_SMB) += rmi_smbus.o diff --git a/drivers/input/rmi4/rmi_bus.h b/drivers/input/rmi4/rmi_bus.h index 8995798..b7625a9 100644 --- a/drivers/input/rmi4/rmi_bus.h +++ b/drivers/input/rmi4/rmi_bus.h @@ -105,6 +105,18 @@ rmi_get_platform_data(struct rmi_device *d) bool rmi_is_physical_device(struct device *dev); /** + * rmi_reset - reset a RMI4 device + * @d: Pointer to an RMI device + * + * Calls for a reset of each function implemented by a specific device. + * Returns 0 on success or a negative error code. + */ +static inline int rmi_reset(struct rmi_device *d) +{ + return d->driver->reset_handler(d); +} + +/** * rmi_read - read a single byte * @d: Pointer to an RMI device * @addr: The address to read from diff --git a/drivers/input/rmi4/rmi_smbus.c b/drivers/input/rmi4/rmi_smbus.c new file mode 100644 index 0000000..96ad325 --- /dev/null +++ b/drivers/input/rmi4/rmi_smbus.c @@ -0,0 +1,448 @@ +/* + * Copyright (c) 2015 - 2016 Red Hat, Inc + * Copyright (c) 2011, 2012 Synaptics Incorporated + * Copyright (c) 2011 Unixphere + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/kconfig.h> +#include <linux/lockdep.h> +#include <linux/module.h> +#include <linux/pm.h> +#include <linux/rmi.h> +#include <linux/slab.h> +#include "rmi_driver.h" + +#define SMB_PROTOCOL_VERSION_ADDRESS 0xfd +#define SMB_MAX_COUNT 32 +#define RMI_SMB2_MAP_SIZE 8 /* 8 entry of 4 bytes each */ +#define RMI_SMB2_MAP_FLAGS_WE 0x01 + +struct mapping_table_entry { + __le16 rmiaddr; + u8 readcount; + u8 flags; +}; + +struct rmi_smb_xport { + struct rmi_transport_dev xport; + struct i2c_client *client; + + struct mutex page_mutex; + int page; + u8 table_index; + struct mutex mappingtable_mutex; + struct mapping_table_entry mapping_table[RMI_SMB2_MAP_SIZE]; +}; + +static int rmi_smb_get_version(struct rmi_smb_xport *rmi_smb) +{ + struct i2c_client *client = rmi_smb->client; + int retval; + + /* Check if for SMBus new version device by reading version byte. */ + retval = i2c_smbus_read_byte_data(client, SMB_PROTOCOL_VERSION_ADDRESS); + if (retval < 0) { + dev_err(&client->dev, "failed to get SMBus version number!\n"); + return retval; + } + return retval + 1; +} + +/* SMB block write - wrapper over ic2_smb_write_block */ +static int smb_block_write(struct rmi_transport_dev *xport, + u8 commandcode, const void *buf, size_t len) +{ + struct rmi_smb_xport *rmi_smb = + container_of(xport, struct rmi_smb_xport, xport); + struct i2c_client *client = rmi_smb->client; + int retval; + + retval = i2c_smbus_write_block_data(client, commandcode, len, buf); + + rmi_dbg(RMI_DEBUG_XPORT, &client->dev, + "wrote %zd bytes at %#04x: %d (%*ph)\n", + len, commandcode, retval, (int)len, buf); + + return retval; +} + +/* + * The function to get command code for smbus operations and keeps + * records to the driver mapping table + */ +static int rmi_smb_get_command_code(struct rmi_transport_dev *xport, + u16 rmiaddr, int bytecount, bool isread, u8 *commandcode) +{ + struct rmi_smb_xport *rmi_smb = + container_of(xport, struct rmi_smb_xport, xport); + int i; + int retval; + struct mapping_table_entry mapping_data[1]; + + mutex_lock(&rmi_smb->mappingtable_mutex); + for (i = 0; i < RMI_SMB2_MAP_SIZE; i++) { + if (rmi_smb->mapping_table[i].rmiaddr == rmiaddr) { + if (isread) { + if (rmi_smb->mapping_table[i].readcount + == bytecount) { + *commandcode = i; + retval = 0; + goto exit; + } + } else { + if (rmi_smb->mapping_table[i].flags & + RMI_SMB2_MAP_FLAGS_WE) { + *commandcode = i; + retval = 0; + goto exit; + } + } + } + } + i = rmi_smb->table_index; + rmi_smb->table_index = (i + 1) % RMI_SMB2_MAP_SIZE; + + /* constructs mapping table data entry. 4 bytes each entry */ + memset(mapping_data, 0, sizeof(mapping_data)); + + mapping_data[0].rmiaddr = cpu_to_le16(rmiaddr); + mapping_data[0].readcount = bytecount; + mapping_data[0].flags = !isread ? RMI_SMB2_MAP_FLAGS_WE : 0; + + retval = smb_block_write(xport, i + 0x80, mapping_data, + sizeof(mapping_data)); + + if (retval < 0) { + /* + * if not written to device mapping table + * clear the driver mapping table records + */ + rmi_smb->mapping_table[i].rmiaddr = 0x0000; + rmi_smb->mapping_table[i].readcount = 0; + rmi_smb->mapping_table[i].flags = 0; + goto exit; + } + /* save to the driver level mapping table */ + rmi_smb->mapping_table[i].rmiaddr = rmiaddr; + rmi_smb->mapping_table[i].readcount = bytecount; + rmi_smb->mapping_table[i].flags = !isread ? RMI_SMB2_MAP_FLAGS_WE : 0; + *commandcode = i; + +exit: + mutex_unlock(&rmi_smb->mappingtable_mutex); + + return retval; +} + +static int rmi_smb_write_block(struct rmi_transport_dev *xport, u16 rmiaddr, + const void *databuff, size_t len) +{ + int retval = 0; + u8 commandcode; + struct rmi_smb_xport *rmi_smb = + container_of(xport, struct rmi_smb_xport, xport); + int cur_len = (int)len; + + mutex_lock(&rmi_smb->page_mutex); + + while (cur_len > 0) { + /* + * break into 32 bytes chunks to write get command code + */ + int block_len = min_t(int, len, SMB_MAX_COUNT); + + retval = rmi_smb_get_command_code(xport, rmiaddr, block_len, + false, &commandcode); + if (retval < 0) + goto exit; + + retval = smb_block_write(xport, commandcode, + databuff, block_len); + if (retval < 0) + goto exit; + + /* prepare to write next block of bytes */ + cur_len -= SMB_MAX_COUNT; + databuff += SMB_MAX_COUNT; + rmiaddr += SMB_MAX_COUNT; + } +exit: + mutex_unlock(&rmi_smb->page_mutex); + return retval; +} + +/* SMB block read - wrapper over ic2_smb_read_block */ +static int smb_block_read(struct rmi_transport_dev *xport, + u8 commandcode, void *buf, size_t len) +{ + struct rmi_smb_xport *rmi_smb = + container_of(xport, struct rmi_smb_xport, xport); + struct i2c_client *client = rmi_smb->client; + int retval; + + retval = i2c_smbus_read_block_data(client, commandcode, buf); + if (retval < 0) + return retval; + + return retval; +} + +static int rmi_smb_read_block(struct rmi_transport_dev *xport, u16 rmiaddr, + void *databuff, size_t len) +{ + struct rmi_smb_xport *rmi_smb = + container_of(xport, struct rmi_smb_xport, xport); + int retval; + u8 commandcode; + int cur_len = (int)len; + + mutex_lock(&rmi_smb->page_mutex); + memset(databuff, 0, len); + + while (cur_len > 0) { + /* break into 32 bytes chunks to write get command code */ + int block_len = min_t(int, cur_len, SMB_MAX_COUNT); + + retval = rmi_smb_get_command_code(xport, rmiaddr, block_len, + true, &commandcode); + if (retval < 0) + goto exit; + + retval = smb_block_read(xport, commandcode, + databuff, block_len); + if (retval < 0) + goto exit; + + /* prepare to read next block of bytes */ + cur_len -= SMB_MAX_COUNT; + databuff += SMB_MAX_COUNT; + rmiaddr += SMB_MAX_COUNT; + } + + retval = 0; + +exit: + mutex_unlock(&rmi_smb->page_mutex); + return retval; +} + +static void rmi_smb_clear_state(struct rmi_smb_xport *rmi_smb) +{ + /* the mapping table has been flushed, discard the current one */ + mutex_lock(&rmi_smb->mappingtable_mutex); + memset(rmi_smb->mapping_table, 0, sizeof(rmi_smb->mapping_table)); + mutex_unlock(&rmi_smb->mappingtable_mutex); +} + +static int rmi_smb_enable_smbus_mode(struct rmi_smb_xport *rmi_smb) +{ + int retval; + + /* we need to get the smbus version to activate the touchpad */ + retval = rmi_smb_get_version(rmi_smb); + if (retval < 0) + return retval; + + return 0; +} + +static int rmi_smb_reset(struct rmi_transport_dev *xport, u16 reset_addr) +{ + struct rmi_smb_xport *rmi_smb = + container_of(xport, struct rmi_smb_xport, xport); + + rmi_smb_clear_state(rmi_smb); + + /* + * we do not call the actual reset command, it has to be handled in + * PS/2 or there will be races between PS/2 and SMBus. + * PS/2 should ensure that a psmouse_reset is called before + * intializing the device and after it has been removed to be in a known + * state. + */ + return rmi_smb_enable_smbus_mode(rmi_smb); +} + +static const struct rmi_transport_ops rmi_smb_ops = { + .write_block = rmi_smb_write_block, + .read_block = rmi_smb_read_block, + .reset = rmi_smb_reset, +}; + +static int rmi_smb_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct rmi_device_platform_data *pdata = dev_get_platdata(&client->dev); + struct rmi_smb_xport *rmi_smb; + int retval; + int smbus_version; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_READ_BLOCK_DATA | + I2C_FUNC_SMBUS_HOST_NOTIFY)) { + dev_err(&client->dev, + "adapter does not support required functionality.\n"); + return -ENODEV; + } + + if (client->irq <= 0) { + dev_err(&client->dev, "no IRQ provided, giving up.\n"); + return client->irq ? client->irq : -ENODEV; + } + + rmi_smb = devm_kzalloc(&client->dev, sizeof(struct rmi_smb_xport), + GFP_KERNEL); + if (!rmi_smb) + return -ENOMEM; + + if (!pdata) { + dev_err(&client->dev, "no platform data, aborting\n"); + return -ENOMEM; + } + + rmi_dbg(RMI_DEBUG_XPORT, &client->dev, "Probing %s.\n", + dev_name(&client->dev)); + + rmi_smb->client = client; + mutex_init(&rmi_smb->page_mutex); + mutex_init(&rmi_smb->mappingtable_mutex); + + rmi_smb->xport.dev = &client->dev; + rmi_smb->xport.pdata = *pdata; + rmi_smb->xport.pdata.irq = client->irq; + rmi_smb->xport.proto_name = "smb2"; + rmi_smb->xport.ops = &rmi_smb_ops; + + retval = rmi_smb_get_version(rmi_smb); + if (retval < 0) + return retval; + + smbus_version = retval; + rmi_dbg(RMI_DEBUG_XPORT, &client->dev, "Smbus version is %d", + smbus_version); + + if (smbus_version != 2) { + dev_err(&client->dev, "Unrecognized SMB version %d.\n", + smbus_version); + return -ENODEV; + } + + i2c_set_clientdata(client, rmi_smb); + + retval = rmi_register_transport_device(&rmi_smb->xport); + if (retval) { + dev_err(&client->dev, "Failed to register transport driver at 0x%.2X.\n", + client->addr); + i2c_set_clientdata(client, NULL); + return retval; + } + + dev_info(&client->dev, "registered rmi smb driver at %#04x.\n", + client->addr); + return 0; + +} + +static int rmi_smb_remove(struct i2c_client *client) +{ + struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client); + + rmi_unregister_transport_device(&rmi_smb->xport); + + return 0; +} + +static int __maybe_unused rmi_smb_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client); + int ret; + + ret = rmi_driver_suspend(rmi_smb->xport.rmi_dev, true); + if (ret) + dev_warn(dev, "Failed to suspend device: %d\n", ret); + + return ret; +} + +static int __maybe_unused rmi_smb_runtime_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client); + int ret; + + ret = rmi_driver_suspend(rmi_smb->xport.rmi_dev, false); + if (ret) + dev_warn(dev, "Failed to suspend device: %d\n", ret); + + return ret; +} + +static int __maybe_unused rmi_smb_resume(struct device *dev) +{ + struct i2c_client *client = container_of(dev, struct i2c_client, dev); + struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client); + struct rmi_device *rmi_dev = rmi_smb->xport.rmi_dev; + int ret; + + rmi_smb_reset(&rmi_smb->xport, 0); + + rmi_reset(rmi_dev); + + ret = rmi_driver_resume(rmi_smb->xport.rmi_dev, true); + if (ret) + dev_warn(dev, "Failed to resume device: %d\n", ret); + + return 0; +} + +static int __maybe_unused rmi_smb_runtime_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct rmi_smb_xport *rmi_smb = i2c_get_clientdata(client); + int ret; + + ret = rmi_driver_resume(rmi_smb->xport.rmi_dev, false); + if (ret) + dev_warn(dev, "Failed to resume device: %d\n", ret); + + return 0; +} + +static const struct dev_pm_ops rmi_smb_pm = { + SET_SYSTEM_SLEEP_PM_OPS(rmi_smb_suspend, rmi_smb_resume) + SET_RUNTIME_PM_OPS(rmi_smb_runtime_suspend, rmi_smb_runtime_resume, + NULL) +}; + +static const struct i2c_device_id rmi_id[] = { + { "rmi4_smbus", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, rmi_id); + +static struct i2c_driver rmi_smb_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "rmi4_smbus", + .pm = &rmi_smb_pm, + }, + .id_table = rmi_id, + .probe = rmi_smb_probe, + .remove = rmi_smb_remove, +}; + +module_i2c_driver(rmi_smb_driver); + +MODULE_AUTHOR("Andrew Duggan <aduggan@synaptics.com>"); +MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@redhat.com>"); +MODULE_DESCRIPTION("RMI4 SMBus driver"); +MODULE_LICENSE("GPL");