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bf08ce132c
All these drivers have an i2c probe function which doesn't use the
"struct i2c_device_id *id" parameter, so they can trivially be
converted to the "probe_new" style of probe with a single argument.
This is part of an ongoing transition to single-argument i2c probe
functions. Old-style probe functions involve a call to i2c_match_id:
in drivers/i2c/i2c-core-base.c,
/*
* When there are no more users of probe(),
* rename probe_new to probe.
*/
if (driver->probe_new)
status = driver->probe_new(client);
else if (driver->probe)
status = driver->probe(client,
i2c_match_id(driver->id_table, client));
else
status = -EINVAL;
Drivers which don't need the second parameter can be declared using
probe_new instead, avoiding the call to i2c_match_id. Drivers which do
can still be converted to probe_new-style, calling i2c_match_id
themselves (as is done currently for of_match_id).
This change was done using the following Coccinelle script, and fixed
up for whitespace changes:
@ rule1 @
identifier fn;
identifier client, id;
@@
- static int fn(struct i2c_client *client, const struct i2c_device_id *id)
+ static int fn(struct i2c_client *client)
{
...when != id
}
@ rule2 depends on rule1 @
identifier rule1.fn;
identifier driver;
@@
struct i2c_driver driver = {
- .probe
+ .probe_new
=
(
fn
|
- &fn
+ fn
)
,
};
Signed-off-by: Stephen Kitt <steve@sk2.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
135 lines
3.1 KiB
C
135 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// Gateworks I2C PLD GPIO expander
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//
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// Copyright (C) 2019 Linus Walleij <linus.walleij@linaro.org>
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//
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// Based on code and know-how from the OpenWrt driver:
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// Copyright (C) 2009 Gateworks Corporation
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// Authors: Chris Lang, Imre Kaloz
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#include <linux/bits.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/gpio/driver.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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/**
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* struct gw_pld - State container for Gateworks PLD
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* @chip: GPIO chip instance
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* @client: I2C client
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* @out: shadow register for the output bute
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*/
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struct gw_pld {
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struct gpio_chip chip;
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struct i2c_client *client;
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u8 out;
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};
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/*
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* The Gateworks I2C PLD chip only expose one read and one write register.
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* Writing a "one" bit (to match the reset state) lets that pin be used as an
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* input. It is an open-drain model.
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*/
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static int gw_pld_input8(struct gpio_chip *gc, unsigned offset)
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{
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struct gw_pld *gw = gpiochip_get_data(gc);
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gw->out |= BIT(offset);
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return i2c_smbus_write_byte(gw->client, gw->out);
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}
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static int gw_pld_get8(struct gpio_chip *gc, unsigned offset)
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{
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struct gw_pld *gw = gpiochip_get_data(gc);
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s32 val;
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val = i2c_smbus_read_byte(gw->client);
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return (val < 0) ? 0 : !!(val & BIT(offset));
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}
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static int gw_pld_output8(struct gpio_chip *gc, unsigned offset, int value)
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{
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struct gw_pld *gw = gpiochip_get_data(gc);
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if (value)
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gw->out |= BIT(offset);
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else
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gw->out &= ~BIT(offset);
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return i2c_smbus_write_byte(gw->client, gw->out);
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}
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static void gw_pld_set8(struct gpio_chip *gc, unsigned offset, int value)
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{
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gw_pld_output8(gc, offset, value);
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}
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static int gw_pld_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct gw_pld *gw;
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int ret;
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gw = devm_kzalloc(dev, sizeof(*gw), GFP_KERNEL);
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if (!gw)
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return -ENOMEM;
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gw->chip.base = -1;
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gw->chip.can_sleep = true;
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gw->chip.parent = dev;
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gw->chip.owner = THIS_MODULE;
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gw->chip.label = dev_name(dev);
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gw->chip.ngpio = 8;
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gw->chip.direction_input = gw_pld_input8;
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gw->chip.get = gw_pld_get8;
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gw->chip.direction_output = gw_pld_output8;
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gw->chip.set = gw_pld_set8;
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gw->client = client;
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/*
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* The Gateworks I2C PLD chip does not properly send the acknowledge
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* bit at all times, but we can still use the standard i2c_smbus
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* functions by simply ignoring this bit.
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*/
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client->flags |= I2C_M_IGNORE_NAK;
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gw->out = 0xFF;
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i2c_set_clientdata(client, gw);
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ret = devm_gpiochip_add_data(dev, &gw->chip, gw);
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if (ret)
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return ret;
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dev_info(dev, "registered Gateworks PLD GPIO device\n");
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return 0;
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}
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static const struct i2c_device_id gw_pld_id[] = {
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{ "gw-pld", },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, gw_pld_id);
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static const struct of_device_id gw_pld_dt_ids[] = {
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{ .compatible = "gateworks,pld-gpio", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, gw_pld_dt_ids);
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static struct i2c_driver gw_pld_driver = {
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.driver = {
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.name = "gw_pld",
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.of_match_table = gw_pld_dt_ids,
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},
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.probe_new = gw_pld_probe,
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.id_table = gw_pld_id,
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};
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module_i2c_driver(gw_pld_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
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