mirror of
https://github.com/torvalds/linux.git
synced 2024-12-07 19:41:31 +00:00
ed5c2f5fd1
The value returned by an i2c driver's remove function is mostly ignored. (Only an error message is printed if the value is non-zero that the error is ignored.) So change the prototype of the remove function to return no value. This way driver authors are not tempted to assume that passing an error to the upper layer is a good idea. All drivers are adapted accordingly. There is no intended change of behaviour, all callbacks were prepared to return 0 before. Reviewed-by: Peter Senna Tschudin <peter.senna@gmail.com> Reviewed-by: Jeremy Kerr <jk@codeconstruct.com.au> Reviewed-by: Benjamin Mugnier <benjamin.mugnier@foss.st.com> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Reviewed-by: Crt Mori <cmo@melexis.com> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Marek Behún <kabel@kernel.org> # for leds-turris-omnia Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Petr Machata <petrm@nvidia.com> # for mlxsw Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com> # for surface3_power Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> # for bmc150-accel-i2c + kxcjk-1013 Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> # for media/* + staging/media/* Acked-by: Miguel Ojeda <ojeda@kernel.org> # for auxdisplay/ht16k33 + auxdisplay/lcd2s Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com> # for versaclock5 Reviewed-by: Ajay Gupta <ajayg@nvidia.com> # for ucsi_ccg Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # for iio Acked-by: Peter Rosin <peda@axentia.se> # for i2c-mux-*, max9860 Acked-by: Adrien Grassein <adrien.grassein@gmail.com> # for lontium-lt8912b Reviewed-by: Jean Delvare <jdelvare@suse.de> # for hwmon, i2c-core and i2c/muxes Acked-by: Corey Minyard <cminyard@mvista.com> # for IPMI Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com> # for drivers/power Acked-by: Krzysztof Hałasa <khalasa@piap.pl> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Wolfram Sang <wsa@kernel.org>
295 lines
6.7 KiB
C
295 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* I2C Link Layer for ST NCI NFC controller familly based Driver
|
|
* Copyright (C) 2014-2015 STMicroelectronics SAS. All rights reserved.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/gpio/consumer.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/nfc.h>
|
|
#include <linux/of.h>
|
|
|
|
#include "st-nci.h"
|
|
|
|
#define DRIVER_DESC "NCI NFC driver for ST_NCI"
|
|
|
|
/* ndlc header */
|
|
#define ST_NCI_FRAME_HEADROOM 1
|
|
#define ST_NCI_FRAME_TAILROOM 0
|
|
|
|
#define ST_NCI_I2C_MIN_SIZE 4 /* PCB(1) + NCI Packet header(3) */
|
|
#define ST_NCI_I2C_MAX_SIZE 250 /* req 4.2.1 */
|
|
|
|
#define ST_NCI_DRIVER_NAME "st_nci"
|
|
#define ST_NCI_I2C_DRIVER_NAME "st_nci_i2c"
|
|
|
|
struct st_nci_i2c_phy {
|
|
struct i2c_client *i2c_dev;
|
|
struct llt_ndlc *ndlc;
|
|
|
|
bool irq_active;
|
|
|
|
struct gpio_desc *gpiod_reset;
|
|
|
|
struct st_nci_se_status se_status;
|
|
};
|
|
|
|
static int st_nci_i2c_enable(void *phy_id)
|
|
{
|
|
struct st_nci_i2c_phy *phy = phy_id;
|
|
|
|
gpiod_set_value(phy->gpiod_reset, 0);
|
|
usleep_range(10000, 15000);
|
|
gpiod_set_value(phy->gpiod_reset, 1);
|
|
usleep_range(80000, 85000);
|
|
|
|
if (phy->ndlc->powered == 0 && phy->irq_active == 0) {
|
|
enable_irq(phy->i2c_dev->irq);
|
|
phy->irq_active = true;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void st_nci_i2c_disable(void *phy_id)
|
|
{
|
|
struct st_nci_i2c_phy *phy = phy_id;
|
|
|
|
disable_irq_nosync(phy->i2c_dev->irq);
|
|
phy->irq_active = false;
|
|
}
|
|
|
|
/*
|
|
* Writing a frame must not return the number of written bytes.
|
|
* It must return either zero for success, or <0 for error.
|
|
* In addition, it must not alter the skb
|
|
*/
|
|
static int st_nci_i2c_write(void *phy_id, struct sk_buff *skb)
|
|
{
|
|
int r;
|
|
struct st_nci_i2c_phy *phy = phy_id;
|
|
struct i2c_client *client = phy->i2c_dev;
|
|
|
|
if (phy->ndlc->hard_fault != 0)
|
|
return phy->ndlc->hard_fault;
|
|
|
|
r = i2c_master_send(client, skb->data, skb->len);
|
|
if (r < 0) { /* Retry, chip was in standby */
|
|
usleep_range(1000, 4000);
|
|
r = i2c_master_send(client, skb->data, skb->len);
|
|
}
|
|
|
|
if (r >= 0) {
|
|
if (r != skb->len)
|
|
r = -EREMOTEIO;
|
|
else
|
|
r = 0;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Reads an ndlc frame and returns it in a newly allocated sk_buff.
|
|
* returns:
|
|
* 0 : if received frame is complete
|
|
* -EREMOTEIO : i2c read error (fatal)
|
|
* -EBADMSG : frame was incorrect and discarded
|
|
* -ENOMEM : cannot allocate skb, frame dropped
|
|
*/
|
|
static int st_nci_i2c_read(struct st_nci_i2c_phy *phy,
|
|
struct sk_buff **skb)
|
|
{
|
|
int r;
|
|
u8 len;
|
|
u8 buf[ST_NCI_I2C_MAX_SIZE];
|
|
struct i2c_client *client = phy->i2c_dev;
|
|
|
|
r = i2c_master_recv(client, buf, ST_NCI_I2C_MIN_SIZE);
|
|
if (r < 0) { /* Retry, chip was in standby */
|
|
usleep_range(1000, 4000);
|
|
r = i2c_master_recv(client, buf, ST_NCI_I2C_MIN_SIZE);
|
|
}
|
|
|
|
if (r != ST_NCI_I2C_MIN_SIZE)
|
|
return -EREMOTEIO;
|
|
|
|
len = be16_to_cpu(*(__be16 *) (buf + 2));
|
|
if (len > ST_NCI_I2C_MAX_SIZE) {
|
|
nfc_err(&client->dev, "invalid frame len\n");
|
|
return -EBADMSG;
|
|
}
|
|
|
|
*skb = alloc_skb(ST_NCI_I2C_MIN_SIZE + len, GFP_KERNEL);
|
|
if (*skb == NULL)
|
|
return -ENOMEM;
|
|
|
|
skb_reserve(*skb, ST_NCI_I2C_MIN_SIZE);
|
|
skb_put(*skb, ST_NCI_I2C_MIN_SIZE);
|
|
memcpy((*skb)->data, buf, ST_NCI_I2C_MIN_SIZE);
|
|
|
|
if (!len)
|
|
return 0;
|
|
|
|
r = i2c_master_recv(client, buf, len);
|
|
if (r != len) {
|
|
kfree_skb(*skb);
|
|
return -EREMOTEIO;
|
|
}
|
|
|
|
skb_put(*skb, len);
|
|
memcpy((*skb)->data + ST_NCI_I2C_MIN_SIZE, buf, len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Reads an ndlc frame from the chip.
|
|
*
|
|
* On ST_NCI, IRQ goes in idle state when read starts.
|
|
*/
|
|
static irqreturn_t st_nci_irq_thread_fn(int irq, void *phy_id)
|
|
{
|
|
struct st_nci_i2c_phy *phy = phy_id;
|
|
struct sk_buff *skb = NULL;
|
|
int r;
|
|
|
|
if (!phy || !phy->ndlc || irq != phy->i2c_dev->irq) {
|
|
WARN_ON_ONCE(1);
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
if (phy->ndlc->hard_fault)
|
|
return IRQ_HANDLED;
|
|
|
|
if (!phy->ndlc->powered) {
|
|
st_nci_i2c_disable(phy);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
r = st_nci_i2c_read(phy, &skb);
|
|
if (r == -EREMOTEIO || r == -ENOMEM || r == -EBADMSG)
|
|
return IRQ_HANDLED;
|
|
|
|
ndlc_recv(phy->ndlc, skb);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static const struct nfc_phy_ops i2c_phy_ops = {
|
|
.write = st_nci_i2c_write,
|
|
.enable = st_nci_i2c_enable,
|
|
.disable = st_nci_i2c_disable,
|
|
};
|
|
|
|
static const struct acpi_gpio_params reset_gpios = { 1, 0, false };
|
|
|
|
static const struct acpi_gpio_mapping acpi_st_nci_gpios[] = {
|
|
{ "reset-gpios", &reset_gpios, 1 },
|
|
{},
|
|
};
|
|
|
|
static int st_nci_i2c_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
struct st_nci_i2c_phy *phy;
|
|
int r;
|
|
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
|
|
nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
phy = devm_kzalloc(dev, sizeof(struct st_nci_i2c_phy), GFP_KERNEL);
|
|
if (!phy)
|
|
return -ENOMEM;
|
|
|
|
phy->i2c_dev = client;
|
|
|
|
i2c_set_clientdata(client, phy);
|
|
|
|
r = devm_acpi_dev_add_driver_gpios(dev, acpi_st_nci_gpios);
|
|
if (r)
|
|
dev_dbg(dev, "Unable to add GPIO mapping table\n");
|
|
|
|
/* Get RESET GPIO */
|
|
phy->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
|
|
if (IS_ERR(phy->gpiod_reset)) {
|
|
nfc_err(dev, "Unable to get RESET GPIO\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
phy->se_status.is_ese_present =
|
|
device_property_read_bool(dev, "ese-present");
|
|
phy->se_status.is_uicc_present =
|
|
device_property_read_bool(dev, "uicc-present");
|
|
|
|
r = ndlc_probe(phy, &i2c_phy_ops, &client->dev,
|
|
ST_NCI_FRAME_HEADROOM, ST_NCI_FRAME_TAILROOM,
|
|
&phy->ndlc, &phy->se_status);
|
|
if (r < 0) {
|
|
nfc_err(&client->dev, "Unable to register ndlc layer\n");
|
|
return r;
|
|
}
|
|
|
|
phy->irq_active = true;
|
|
r = devm_request_threaded_irq(&client->dev, client->irq, NULL,
|
|
st_nci_irq_thread_fn,
|
|
IRQF_ONESHOT,
|
|
ST_NCI_DRIVER_NAME, phy);
|
|
if (r < 0)
|
|
nfc_err(&client->dev, "Unable to register IRQ handler\n");
|
|
|
|
return r;
|
|
}
|
|
|
|
static void st_nci_i2c_remove(struct i2c_client *client)
|
|
{
|
|
struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
|
|
|
|
ndlc_remove(phy->ndlc);
|
|
}
|
|
|
|
static const struct i2c_device_id st_nci_i2c_id_table[] = {
|
|
{ST_NCI_DRIVER_NAME, 0},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, st_nci_i2c_id_table);
|
|
|
|
static const struct acpi_device_id st_nci_i2c_acpi_match[] __maybe_unused = {
|
|
{"SMO2101"},
|
|
{"SMO2102"},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, st_nci_i2c_acpi_match);
|
|
|
|
static const struct of_device_id of_st_nci_i2c_match[] __maybe_unused = {
|
|
{ .compatible = "st,st21nfcb-i2c", },
|
|
{ .compatible = "st,st21nfcb_i2c", },
|
|
{ .compatible = "st,st21nfcc-i2c", },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_st_nci_i2c_match);
|
|
|
|
static struct i2c_driver st_nci_i2c_driver = {
|
|
.driver = {
|
|
.name = ST_NCI_I2C_DRIVER_NAME,
|
|
.of_match_table = of_match_ptr(of_st_nci_i2c_match),
|
|
.acpi_match_table = ACPI_PTR(st_nci_i2c_acpi_match),
|
|
},
|
|
.probe = st_nci_i2c_probe,
|
|
.id_table = st_nci_i2c_id_table,
|
|
.remove = st_nci_i2c_remove,
|
|
};
|
|
module_i2c_driver(st_nci_i2c_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|