2022-03-10 04:05:39 -05:00
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// SPDX-License-Identifier: GPL-2.0
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2016-08-12 11:16:49 -04:00
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/*
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* Digital I/O driver for Technologic Systems I2C FPGA Core
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*
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2022-03-09 20:16:16 -05:00
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* Copyright (C) 2015, 2018 Technologic Systems
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2016-08-12 11:16:49 -04:00
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* Copyright (C) 2016 Savoir-Faire Linux
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*/
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#include <linux/gpio/driver.h>
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#include <linux/i2c.h>
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2023-07-14 13:44:58 -04:00
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#include <linux/of.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#define DEFAULT_PIN_NUMBER 32
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/*
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* Register bits used by the GPIO device
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* Some boards, such as TS-7970 do not have a separate input bit
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*/
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#define TS4900_GPIO_OE 0x01
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#define TS4900_GPIO_OUT 0x02
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#define TS4900_GPIO_IN 0x04
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#define TS7970_GPIO_IN 0x02
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struct ts4900_gpio_priv {
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struct regmap *regmap;
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struct gpio_chip gpio_chip;
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unsigned int input_bit;
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};
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static int ts4900_gpio_get_direction(struct gpio_chip *chip,
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unsigned int offset)
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{
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struct ts4900_gpio_priv *priv = gpiochip_get_data(chip);
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unsigned int reg;
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regmap_read(priv->regmap, offset, ®);
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2019-11-06 03:54:12 -05:00
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if (reg & TS4900_GPIO_OE)
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return GPIO_LINE_DIRECTION_OUT;
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return GPIO_LINE_DIRECTION_IN;
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2016-08-12 11:16:49 -04:00
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}
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static int ts4900_gpio_direction_input(struct gpio_chip *chip,
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unsigned int offset)
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{
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struct ts4900_gpio_priv *priv = gpiochip_get_data(chip);
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2022-03-11 13:19:58 -05:00
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/*
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* Only clear the OE bit here, requires a RMW. Prevents a potential issue
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* with OE and DAT getting to the physical pin at different times.
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*/
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return regmap_update_bits(priv->regmap, offset, TS4900_GPIO_OE, 0);
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2016-08-12 11:16:49 -04:00
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}
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static int ts4900_gpio_direction_output(struct gpio_chip *chip,
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unsigned int offset, int value)
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{
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struct ts4900_gpio_priv *priv = gpiochip_get_data(chip);
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unsigned int reg;
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int ret;
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2022-03-11 13:19:58 -05:00
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/*
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* If changing from an input to an output, we need to first set the
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* GPIO's DAT bit to what is requested and then set the OE bit. This
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* prevents a glitch that can occur on the IO line.
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*/
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regmap_read(priv->regmap, offset, ®);
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if (!(reg & TS4900_GPIO_OE)) {
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if (value)
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reg = TS4900_GPIO_OUT;
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else
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reg &= ~TS4900_GPIO_OUT;
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regmap_write(priv->regmap, offset, reg);
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}
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2016-08-12 11:16:49 -04:00
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if (value)
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ret = regmap_write(priv->regmap, offset, TS4900_GPIO_OE |
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TS4900_GPIO_OUT);
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else
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ret = regmap_write(priv->regmap, offset, TS4900_GPIO_OE);
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return ret;
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}
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static int ts4900_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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struct ts4900_gpio_priv *priv = gpiochip_get_data(chip);
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unsigned int reg;
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regmap_read(priv->regmap, offset, ®);
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return !!(reg & priv->input_bit);
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}
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static void ts4900_gpio_set(struct gpio_chip *chip, unsigned int offset,
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int value)
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{
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struct ts4900_gpio_priv *priv = gpiochip_get_data(chip);
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if (value)
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regmap_update_bits(priv->regmap, offset, TS4900_GPIO_OUT,
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TS4900_GPIO_OUT);
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else
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regmap_update_bits(priv->regmap, offset, TS4900_GPIO_OUT, 0);
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}
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static const struct regmap_config ts4900_regmap_config = {
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.reg_bits = 16,
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.val_bits = 8,
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};
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2016-09-11 08:14:37 -04:00
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static const struct gpio_chip template_chip = {
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.label = "ts4900-gpio",
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.owner = THIS_MODULE,
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.get_direction = ts4900_gpio_get_direction,
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.direction_input = ts4900_gpio_direction_input,
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.direction_output = ts4900_gpio_direction_output,
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.get = ts4900_gpio_get,
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.set = ts4900_gpio_set,
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.base = -1,
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.can_sleep = true,
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};
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static const struct of_device_id ts4900_gpio_of_match_table[] = {
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{
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.compatible = "technologic,ts4900-gpio",
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.data = (void *)TS4900_GPIO_IN,
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}, {
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.compatible = "technologic,ts7970-gpio",
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.data = (void *)TS7970_GPIO_IN,
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},
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, ts4900_gpio_of_match_table);
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drivers/gpio: use simple i2c probe
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
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- &fn
+ fn
)
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};
Signed-off-by: Stephen Kitt <steve@sk2.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-10-12 10:25:23 -04:00
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static int ts4900_gpio_probe(struct i2c_client *client)
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{
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struct ts4900_gpio_priv *priv;
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u32 ngpio;
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int ret;
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if (of_property_read_u32(client->dev.of_node, "ngpios", &ngpio))
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ngpio = DEFAULT_PIN_NUMBER;
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priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->gpio_chip = template_chip;
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priv->gpio_chip.label = "ts4900-gpio";
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priv->gpio_chip.ngpio = ngpio;
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priv->gpio_chip.parent = &client->dev;
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2018-04-30 03:38:17 -04:00
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priv->input_bit = (uintptr_t)of_device_get_match_data(&client->dev);
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priv->regmap = devm_regmap_init_i2c(client, &ts4900_regmap_config);
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if (IS_ERR(priv->regmap)) {
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ret = PTR_ERR(priv->regmap);
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dev_err(&client->dev, "Failed to allocate register map: %d\n",
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ret);
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return ret;
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}
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ret = devm_gpiochip_add_data(&client->dev, &priv->gpio_chip, priv);
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if (ret < 0) {
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dev_err(&client->dev, "Unable to register gpiochip\n");
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return ret;
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}
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i2c_set_clientdata(client, priv);
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return 0;
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}
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static const struct i2c_device_id ts4900_gpio_id_table[] = {
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{ "ts4900-gpio", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(i2c, ts4900_gpio_id_table);
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static struct i2c_driver ts4900_gpio_driver = {
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.driver = {
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.name = "ts4900-gpio",
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.of_match_table = ts4900_gpio_of_match_table,
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},
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.probe = ts4900_gpio_probe,
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.id_table = ts4900_gpio_id_table,
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};
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module_i2c_driver(ts4900_gpio_driver);
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MODULE_AUTHOR("Technologic Systems");
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MODULE_DESCRIPTION("GPIO interface for Technologic Systems I2C-FPGA core");
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MODULE_LICENSE("GPL");
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