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![Linus Walleij](/assets/img/avatar_default.png)
This makes the driver use the irqchip template to assign properties to the gpio_irq_chip instead of using the explicit calls to gpiochip_irqchip_add_nested() and gpiochip_set_nested_irqchip(). The irqchip is instead added while adding the gpiochip. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Tested-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org> Cc: Sam Protsenko <semen.protsenko@linaro.org> Link: https://lore.kernel.org/r/20200726221259.133536-1-linus.walleij@linaro.org
764 lines
18 KiB
C
764 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* MAX732x I2C Port Expander with 8/16 I/O
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*
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* Copyright (C) 2007 Marvell International Ltd.
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* Copyright (C) 2008 Jack Ren <jack.ren@marvell.com>
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* Copyright (C) 2008 Eric Miao <eric.miao@marvell.com>
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* Copyright (C) 2015 Linus Walleij <linus.walleij@linaro.org>
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*
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* Derived from drivers/gpio/pca953x.c
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/gpio/driver.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/platform_data/max732x.h>
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#include <linux/of.h>
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/*
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* Each port of MAX732x (including MAX7319) falls into one of the
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* following three types:
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*
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* - Push Pull Output
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* - Input
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* - Open Drain I/O
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*
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* designated by 'O', 'I' and 'P' individually according to MAXIM's
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* datasheets. 'I' and 'P' ports are interrupt capables, some with
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* a dedicated interrupt mask.
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*
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* There are two groups of I/O ports, each group usually includes
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* up to 8 I/O ports, and is accessed by a specific I2C address:
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*
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* - Group A : by I2C address 0b'110xxxx
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* - Group B : by I2C address 0b'101xxxx
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*
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* where 'xxxx' is decided by the connections of pin AD2/AD0. The
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* address used also affects the initial state of output signals.
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*
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* Within each group of ports, there are five known combinations of
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* I/O ports: 4I4O, 4P4O, 8I, 8P, 8O, see the definitions below for
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* the detailed organization of these ports. Only Goup A is interrupt
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* capable.
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*
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* GPIO numbers start from 'gpio_base + 0' to 'gpio_base + 8/16',
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* and GPIOs from GROUP_A are numbered before those from GROUP_B
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* (if there are two groups).
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*
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* NOTE: MAX7328/MAX7329 are drop-in replacements for PCF8574/a, so
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* they are not supported by this driver.
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*/
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#define PORT_NONE 0x0 /* '/' No Port */
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#define PORT_OUTPUT 0x1 /* 'O' Push-Pull, Output Only */
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#define PORT_INPUT 0x2 /* 'I' Input Only */
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#define PORT_OPENDRAIN 0x3 /* 'P' Open-Drain, I/O */
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#define IO_4I4O 0x5AA5 /* O7 O6 I5 I4 I3 I2 O1 O0 */
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#define IO_4P4O 0x5FF5 /* O7 O6 P5 P4 P3 P2 O1 O0 */
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#define IO_8I 0xAAAA /* I7 I6 I5 I4 I3 I2 I1 I0 */
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#define IO_8P 0xFFFF /* P7 P6 P5 P4 P3 P2 P1 P0 */
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#define IO_8O 0x5555 /* O7 O6 O5 O4 O3 O2 O1 O0 */
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#define GROUP_A(x) ((x) & 0xffff) /* I2C Addr: 0b'110xxxx */
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#define GROUP_B(x) ((x) << 16) /* I2C Addr: 0b'101xxxx */
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#define INT_NONE 0x0 /* No interrupt capability */
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#define INT_NO_MASK 0x1 /* Has interrupts, no mask */
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#define INT_INDEP_MASK 0x2 /* Has interrupts, independent mask */
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#define INT_MERGED_MASK 0x3 /* Has interrupts, merged mask */
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#define INT_CAPS(x) (((uint64_t)(x)) << 32)
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enum {
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MAX7319,
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MAX7320,
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MAX7321,
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MAX7322,
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MAX7323,
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MAX7324,
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MAX7325,
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MAX7326,
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MAX7327,
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};
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static uint64_t max732x_features[] = {
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[MAX7319] = GROUP_A(IO_8I) | INT_CAPS(INT_MERGED_MASK),
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[MAX7320] = GROUP_B(IO_8O),
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[MAX7321] = GROUP_A(IO_8P) | INT_CAPS(INT_NO_MASK),
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[MAX7322] = GROUP_A(IO_4I4O) | INT_CAPS(INT_MERGED_MASK),
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[MAX7323] = GROUP_A(IO_4P4O) | INT_CAPS(INT_INDEP_MASK),
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[MAX7324] = GROUP_A(IO_8I) | GROUP_B(IO_8O) | INT_CAPS(INT_MERGED_MASK),
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[MAX7325] = GROUP_A(IO_8P) | GROUP_B(IO_8O) | INT_CAPS(INT_NO_MASK),
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[MAX7326] = GROUP_A(IO_4I4O) | GROUP_B(IO_8O) | INT_CAPS(INT_MERGED_MASK),
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[MAX7327] = GROUP_A(IO_4P4O) | GROUP_B(IO_8O) | INT_CAPS(INT_NO_MASK),
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};
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static const struct i2c_device_id max732x_id[] = {
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{ "max7319", MAX7319 },
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{ "max7320", MAX7320 },
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{ "max7321", MAX7321 },
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{ "max7322", MAX7322 },
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{ "max7323", MAX7323 },
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{ "max7324", MAX7324 },
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{ "max7325", MAX7325 },
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{ "max7326", MAX7326 },
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{ "max7327", MAX7327 },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, max732x_id);
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#ifdef CONFIG_OF
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static const struct of_device_id max732x_of_table[] = {
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{ .compatible = "maxim,max7319" },
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{ .compatible = "maxim,max7320" },
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{ .compatible = "maxim,max7321" },
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{ .compatible = "maxim,max7322" },
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{ .compatible = "maxim,max7323" },
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{ .compatible = "maxim,max7324" },
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{ .compatible = "maxim,max7325" },
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{ .compatible = "maxim,max7326" },
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{ .compatible = "maxim,max7327" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, max732x_of_table);
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#endif
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struct max732x_chip {
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struct gpio_chip gpio_chip;
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struct i2c_client *client; /* "main" client */
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struct i2c_client *client_dummy;
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struct i2c_client *client_group_a;
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struct i2c_client *client_group_b;
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unsigned int mask_group_a;
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unsigned int dir_input;
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unsigned int dir_output;
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struct mutex lock;
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uint8_t reg_out[2];
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#ifdef CONFIG_GPIO_MAX732X_IRQ
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struct mutex irq_lock;
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uint8_t irq_mask;
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uint8_t irq_mask_cur;
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uint8_t irq_trig_raise;
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uint8_t irq_trig_fall;
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uint8_t irq_features;
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#endif
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};
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static int max732x_writeb(struct max732x_chip *chip, int group_a, uint8_t val)
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{
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struct i2c_client *client;
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int ret;
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client = group_a ? chip->client_group_a : chip->client_group_b;
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ret = i2c_smbus_write_byte(client, val);
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if (ret < 0) {
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dev_err(&client->dev, "failed writing\n");
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return ret;
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}
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return 0;
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}
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static int max732x_readb(struct max732x_chip *chip, int group_a, uint8_t *val)
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{
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struct i2c_client *client;
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int ret;
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client = group_a ? chip->client_group_a : chip->client_group_b;
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ret = i2c_smbus_read_byte(client);
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if (ret < 0) {
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dev_err(&client->dev, "failed reading\n");
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return ret;
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}
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*val = (uint8_t)ret;
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return 0;
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}
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static inline int is_group_a(struct max732x_chip *chip, unsigned off)
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{
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return (1u << off) & chip->mask_group_a;
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}
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static int max732x_gpio_get_value(struct gpio_chip *gc, unsigned off)
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{
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struct max732x_chip *chip = gpiochip_get_data(gc);
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uint8_t reg_val;
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int ret;
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ret = max732x_readb(chip, is_group_a(chip, off), ®_val);
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if (ret < 0)
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return ret;
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return !!(reg_val & (1u << (off & 0x7)));
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}
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static void max732x_gpio_set_mask(struct gpio_chip *gc, unsigned off, int mask,
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int val)
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{
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struct max732x_chip *chip = gpiochip_get_data(gc);
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uint8_t reg_out;
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int ret;
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mutex_lock(&chip->lock);
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reg_out = (off > 7) ? chip->reg_out[1] : chip->reg_out[0];
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reg_out = (reg_out & ~mask) | (val & mask);
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ret = max732x_writeb(chip, is_group_a(chip, off), reg_out);
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if (ret < 0)
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goto out;
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/* update the shadow register then */
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if (off > 7)
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chip->reg_out[1] = reg_out;
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else
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chip->reg_out[0] = reg_out;
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out:
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mutex_unlock(&chip->lock);
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}
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static void max732x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
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{
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unsigned base = off & ~0x7;
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uint8_t mask = 1u << (off & 0x7);
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max732x_gpio_set_mask(gc, base, mask, val << (off & 0x7));
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}
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static void max732x_gpio_set_multiple(struct gpio_chip *gc,
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unsigned long *mask, unsigned long *bits)
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{
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unsigned mask_lo = mask[0] & 0xff;
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unsigned mask_hi = (mask[0] >> 8) & 0xff;
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if (mask_lo)
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max732x_gpio_set_mask(gc, 0, mask_lo, bits[0] & 0xff);
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if (mask_hi)
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max732x_gpio_set_mask(gc, 8, mask_hi, (bits[0] >> 8) & 0xff);
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}
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static int max732x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
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{
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struct max732x_chip *chip = gpiochip_get_data(gc);
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unsigned int mask = 1u << off;
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if ((mask & chip->dir_input) == 0) {
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dev_dbg(&chip->client->dev, "%s port %d is output only\n",
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chip->client->name, off);
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return -EACCES;
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}
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/*
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* Open-drain pins must be set to high impedance (which is
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* equivalent to output-high) to be turned into an input.
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*/
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if ((mask & chip->dir_output))
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max732x_gpio_set_value(gc, off, 1);
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return 0;
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}
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static int max732x_gpio_direction_output(struct gpio_chip *gc,
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unsigned off, int val)
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{
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struct max732x_chip *chip = gpiochip_get_data(gc);
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unsigned int mask = 1u << off;
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if ((mask & chip->dir_output) == 0) {
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dev_dbg(&chip->client->dev, "%s port %d is input only\n",
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chip->client->name, off);
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return -EACCES;
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}
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max732x_gpio_set_value(gc, off, val);
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return 0;
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}
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#ifdef CONFIG_GPIO_MAX732X_IRQ
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static int max732x_writew(struct max732x_chip *chip, uint16_t val)
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{
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int ret;
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val = cpu_to_le16(val);
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ret = i2c_master_send(chip->client_group_a, (char *)&val, 2);
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if (ret < 0) {
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dev_err(&chip->client_group_a->dev, "failed writing\n");
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return ret;
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}
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return 0;
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}
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static int max732x_readw(struct max732x_chip *chip, uint16_t *val)
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{
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int ret;
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ret = i2c_master_recv(chip->client_group_a, (char *)val, 2);
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if (ret < 0) {
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dev_err(&chip->client_group_a->dev, "failed reading\n");
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return ret;
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}
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*val = le16_to_cpu(*val);
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return 0;
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}
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static void max732x_irq_update_mask(struct max732x_chip *chip)
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{
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uint16_t msg;
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if (chip->irq_mask == chip->irq_mask_cur)
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return;
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chip->irq_mask = chip->irq_mask_cur;
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if (chip->irq_features == INT_NO_MASK)
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return;
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mutex_lock(&chip->lock);
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switch (chip->irq_features) {
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case INT_INDEP_MASK:
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msg = (chip->irq_mask << 8) | chip->reg_out[0];
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max732x_writew(chip, msg);
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break;
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case INT_MERGED_MASK:
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msg = chip->irq_mask | chip->reg_out[0];
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max732x_writeb(chip, 1, (uint8_t)msg);
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break;
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}
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mutex_unlock(&chip->lock);
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}
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static void max732x_irq_mask(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct max732x_chip *chip = gpiochip_get_data(gc);
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chip->irq_mask_cur &= ~(1 << d->hwirq);
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}
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static void max732x_irq_unmask(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct max732x_chip *chip = gpiochip_get_data(gc);
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chip->irq_mask_cur |= 1 << d->hwirq;
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}
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static void max732x_irq_bus_lock(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct max732x_chip *chip = gpiochip_get_data(gc);
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mutex_lock(&chip->irq_lock);
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chip->irq_mask_cur = chip->irq_mask;
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}
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static void max732x_irq_bus_sync_unlock(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct max732x_chip *chip = gpiochip_get_data(gc);
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uint16_t new_irqs;
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uint16_t level;
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max732x_irq_update_mask(chip);
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new_irqs = chip->irq_trig_fall | chip->irq_trig_raise;
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while (new_irqs) {
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level = __ffs(new_irqs);
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max732x_gpio_direction_input(&chip->gpio_chip, level);
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new_irqs &= ~(1 << level);
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}
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mutex_unlock(&chip->irq_lock);
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}
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static int max732x_irq_set_type(struct irq_data *d, unsigned int type)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct max732x_chip *chip = gpiochip_get_data(gc);
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uint16_t off = d->hwirq;
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uint16_t mask = 1 << off;
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if (!(mask & chip->dir_input)) {
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dev_dbg(&chip->client->dev, "%s port %d is output only\n",
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chip->client->name, off);
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return -EACCES;
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}
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if (!(type & IRQ_TYPE_EDGE_BOTH)) {
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dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
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d->irq, type);
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return -EINVAL;
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}
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if (type & IRQ_TYPE_EDGE_FALLING)
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chip->irq_trig_fall |= mask;
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else
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chip->irq_trig_fall &= ~mask;
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if (type & IRQ_TYPE_EDGE_RISING)
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chip->irq_trig_raise |= mask;
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else
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chip->irq_trig_raise &= ~mask;
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return 0;
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}
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static int max732x_irq_set_wake(struct irq_data *data, unsigned int on)
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{
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struct max732x_chip *chip = irq_data_get_irq_chip_data(data);
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irq_set_irq_wake(chip->client->irq, on);
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return 0;
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}
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static struct irq_chip max732x_irq_chip = {
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.name = "max732x",
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.irq_mask = max732x_irq_mask,
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.irq_unmask = max732x_irq_unmask,
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.irq_bus_lock = max732x_irq_bus_lock,
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.irq_bus_sync_unlock = max732x_irq_bus_sync_unlock,
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.irq_set_type = max732x_irq_set_type,
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.irq_set_wake = max732x_irq_set_wake,
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};
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static uint8_t max732x_irq_pending(struct max732x_chip *chip)
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{
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uint8_t cur_stat;
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uint8_t old_stat;
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uint8_t trigger;
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uint8_t pending;
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uint16_t status;
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int ret;
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ret = max732x_readw(chip, &status);
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if (ret)
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return 0;
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trigger = status >> 8;
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trigger &= chip->irq_mask;
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if (!trigger)
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return 0;
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cur_stat = status & 0xFF;
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cur_stat &= chip->irq_mask;
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old_stat = cur_stat ^ trigger;
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pending = (old_stat & chip->irq_trig_fall) |
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(cur_stat & chip->irq_trig_raise);
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pending &= trigger;
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return pending;
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}
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static irqreturn_t max732x_irq_handler(int irq, void *devid)
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{
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struct max732x_chip *chip = devid;
|
|
uint8_t pending;
|
|
uint8_t level;
|
|
|
|
pending = max732x_irq_pending(chip);
|
|
|
|
if (!pending)
|
|
return IRQ_HANDLED;
|
|
|
|
do {
|
|
level = __ffs(pending);
|
|
handle_nested_irq(irq_find_mapping(chip->gpio_chip.irq.domain,
|
|
level));
|
|
|
|
pending &= ~(1 << level);
|
|
} while (pending);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int max732x_irq_setup(struct max732x_chip *chip,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct i2c_client *client = chip->client;
|
|
struct max732x_platform_data *pdata = dev_get_platdata(&client->dev);
|
|
int has_irq = max732x_features[id->driver_data] >> 32;
|
|
int irq_base = 0;
|
|
int ret;
|
|
|
|
if (((pdata && pdata->irq_base) || client->irq)
|
|
&& has_irq != INT_NONE) {
|
|
struct gpio_irq_chip *girq;
|
|
|
|
if (pdata)
|
|
irq_base = pdata->irq_base;
|
|
chip->irq_features = has_irq;
|
|
mutex_init(&chip->irq_lock);
|
|
|
|
ret = devm_request_threaded_irq(&client->dev, client->irq,
|
|
NULL, max732x_irq_handler, IRQF_ONESHOT |
|
|
IRQF_TRIGGER_FALLING | IRQF_SHARED,
|
|
dev_name(&client->dev), chip);
|
|
if (ret) {
|
|
dev_err(&client->dev, "failed to request irq %d\n",
|
|
client->irq);
|
|
return ret;
|
|
}
|
|
|
|
girq = &chip->gpio_chip.irq;
|
|
girq->chip = &max732x_irq_chip;
|
|
/* This will let us handle the parent IRQ in the driver */
|
|
girq->parent_handler = NULL;
|
|
girq->num_parents = 0;
|
|
girq->parents = NULL;
|
|
girq->default_type = IRQ_TYPE_NONE;
|
|
girq->handler = handle_simple_irq;
|
|
girq->threaded = true;
|
|
girq->first = irq_base; /* FIXME: get rid of this */
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#else /* CONFIG_GPIO_MAX732X_IRQ */
|
|
static int max732x_irq_setup(struct max732x_chip *chip,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct i2c_client *client = chip->client;
|
|
struct max732x_platform_data *pdata = dev_get_platdata(&client->dev);
|
|
int has_irq = max732x_features[id->driver_data] >> 32;
|
|
|
|
if (((pdata && pdata->irq_base) || client->irq) && has_irq != INT_NONE)
|
|
dev_warn(&client->dev, "interrupt support not compiled in\n");
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int max732x_setup_gpio(struct max732x_chip *chip,
|
|
const struct i2c_device_id *id,
|
|
unsigned gpio_start)
|
|
{
|
|
struct gpio_chip *gc = &chip->gpio_chip;
|
|
uint32_t id_data = (uint32_t)max732x_features[id->driver_data];
|
|
int i, port = 0;
|
|
|
|
for (i = 0; i < 16; i++, id_data >>= 2) {
|
|
unsigned int mask = 1 << port;
|
|
|
|
switch (id_data & 0x3) {
|
|
case PORT_OUTPUT:
|
|
chip->dir_output |= mask;
|
|
break;
|
|
case PORT_INPUT:
|
|
chip->dir_input |= mask;
|
|
break;
|
|
case PORT_OPENDRAIN:
|
|
chip->dir_output |= mask;
|
|
chip->dir_input |= mask;
|
|
break;
|
|
default:
|
|
continue;
|
|
}
|
|
|
|
if (i < 8)
|
|
chip->mask_group_a |= mask;
|
|
port++;
|
|
}
|
|
|
|
if (chip->dir_input)
|
|
gc->direction_input = max732x_gpio_direction_input;
|
|
if (chip->dir_output) {
|
|
gc->direction_output = max732x_gpio_direction_output;
|
|
gc->set = max732x_gpio_set_value;
|
|
gc->set_multiple = max732x_gpio_set_multiple;
|
|
}
|
|
gc->get = max732x_gpio_get_value;
|
|
gc->can_sleep = true;
|
|
|
|
gc->base = gpio_start;
|
|
gc->ngpio = port;
|
|
gc->label = chip->client->name;
|
|
gc->parent = &chip->client->dev;
|
|
gc->owner = THIS_MODULE;
|
|
|
|
return port;
|
|
}
|
|
|
|
static struct max732x_platform_data *of_gpio_max732x(struct device *dev)
|
|
{
|
|
struct max732x_platform_data *pdata;
|
|
|
|
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata)
|
|
return NULL;
|
|
|
|
pdata->gpio_base = -1;
|
|
|
|
return pdata;
|
|
}
|
|
|
|
static int max732x_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct max732x_platform_data *pdata;
|
|
struct device_node *node;
|
|
struct max732x_chip *chip;
|
|
struct i2c_client *c;
|
|
uint16_t addr_a, addr_b;
|
|
int ret, nr_port;
|
|
|
|
pdata = dev_get_platdata(&client->dev);
|
|
node = client->dev.of_node;
|
|
|
|
if (!pdata && node)
|
|
pdata = of_gpio_max732x(&client->dev);
|
|
|
|
if (!pdata) {
|
|
dev_dbg(&client->dev, "no platform data\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
|
|
if (chip == NULL)
|
|
return -ENOMEM;
|
|
chip->client = client;
|
|
|
|
nr_port = max732x_setup_gpio(chip, id, pdata->gpio_base);
|
|
chip->gpio_chip.parent = &client->dev;
|
|
|
|
addr_a = (client->addr & 0x0f) | 0x60;
|
|
addr_b = (client->addr & 0x0f) | 0x50;
|
|
|
|
switch (client->addr & 0x70) {
|
|
case 0x60:
|
|
chip->client_group_a = client;
|
|
if (nr_port > 8) {
|
|
c = devm_i2c_new_dummy_device(&client->dev,
|
|
client->adapter, addr_b);
|
|
if (IS_ERR(c)) {
|
|
dev_err(&client->dev,
|
|
"Failed to allocate I2C device\n");
|
|
return PTR_ERR(c);
|
|
}
|
|
chip->client_group_b = chip->client_dummy = c;
|
|
}
|
|
break;
|
|
case 0x50:
|
|
chip->client_group_b = client;
|
|
if (nr_port > 8) {
|
|
c = devm_i2c_new_dummy_device(&client->dev,
|
|
client->adapter, addr_a);
|
|
if (IS_ERR(c)) {
|
|
dev_err(&client->dev,
|
|
"Failed to allocate I2C device\n");
|
|
return PTR_ERR(c);
|
|
}
|
|
chip->client_group_a = chip->client_dummy = c;
|
|
}
|
|
break;
|
|
default:
|
|
dev_err(&client->dev, "invalid I2C address specified %02x\n",
|
|
client->addr);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (nr_port > 8 && !chip->client_dummy) {
|
|
dev_err(&client->dev,
|
|
"Failed to allocate second group I2C device\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
mutex_init(&chip->lock);
|
|
|
|
ret = max732x_readb(chip, is_group_a(chip, 0), &chip->reg_out[0]);
|
|
if (ret)
|
|
return ret;
|
|
if (nr_port > 8) {
|
|
ret = max732x_readb(chip, is_group_a(chip, 8), &chip->reg_out[1]);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
ret = max732x_irq_setup(chip, id);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (pdata->setup) {
|
|
ret = pdata->setup(client, chip->gpio_chip.base,
|
|
chip->gpio_chip.ngpio, pdata->context);
|
|
if (ret < 0)
|
|
dev_warn(&client->dev, "setup failed, %d\n", ret);
|
|
}
|
|
|
|
i2c_set_clientdata(client, chip);
|
|
return 0;
|
|
}
|
|
|
|
static int max732x_remove(struct i2c_client *client)
|
|
{
|
|
struct max732x_platform_data *pdata = dev_get_platdata(&client->dev);
|
|
struct max732x_chip *chip = i2c_get_clientdata(client);
|
|
|
|
if (pdata && pdata->teardown) {
|
|
int ret;
|
|
|
|
ret = pdata->teardown(client, chip->gpio_chip.base,
|
|
chip->gpio_chip.ngpio, pdata->context);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "%s failed, %d\n",
|
|
"teardown", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct i2c_driver max732x_driver = {
|
|
.driver = {
|
|
.name = "max732x",
|
|
.of_match_table = of_match_ptr(max732x_of_table),
|
|
},
|
|
.probe = max732x_probe,
|
|
.remove = max732x_remove,
|
|
.id_table = max732x_id,
|
|
};
|
|
|
|
static int __init max732x_init(void)
|
|
{
|
|
return i2c_add_driver(&max732x_driver);
|
|
}
|
|
/* register after i2c postcore initcall and before
|
|
* subsys initcalls that may rely on these GPIOs
|
|
*/
|
|
subsys_initcall(max732x_init);
|
|
|
|
static void __exit max732x_exit(void)
|
|
{
|
|
i2c_del_driver(&max732x_driver);
|
|
}
|
|
module_exit(max732x_exit);
|
|
|
|
MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
|
|
MODULE_DESCRIPTION("GPIO expander driver for MAX732X");
|
|
MODULE_LICENSE("GPL");
|