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764 lines
18 KiB
764 lines
18 KiB
// 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 <[email protected]> |
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* Copyright (C) 2008 Eric Miao <[email protected]> |
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* Copyright (C) 2015 Linus Walleij <[email protected]> |
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* |
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* Derived from drivers/gpio/pca953x.c |
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*/ |
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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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/* |
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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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|
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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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|
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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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|
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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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|
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#define INT_CAPS(x) (((uint64_t)(x)) << 32) |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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struct mutex lock; |
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uint8_t reg_out[2]; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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chip->irq_mask_cur |= 1 << d->hwirq; |
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} |
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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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|
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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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|
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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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|
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mutex_unlock(&chip->irq_lock); |
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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return 0; |
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} |
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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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|
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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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|
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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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|
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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; |
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uint8_t pending; |
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uint8_t level; |
|
|
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pending = max732x_irq_pending(chip); |
|
|
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if (!pending) |
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return IRQ_HANDLED; |
|
|
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do { |
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level = __ffs(pending); |
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handle_nested_irq(irq_find_mapping(chip->gpio_chip.irq.domain, |
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level)); |
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|
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pending &= ~(1 << level); |
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} while (pending); |
|
|
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return IRQ_HANDLED; |
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} |
|
|
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static int max732x_irq_setup(struct max732x_chip *chip, |
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const struct i2c_device_id *id) |
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{ |
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struct i2c_client *client = chip->client; |
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struct max732x_platform_data *pdata = dev_get_platdata(&client->dev); |
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int has_irq = max732x_features[id->driver_data] >> 32; |
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int irq_base = 0; |
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int ret; |
|
|
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if (((pdata && pdata->irq_base) || client->irq) |
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&& has_irq != INT_NONE) { |
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struct gpio_irq_chip *girq; |
|
|
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if (pdata) |
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irq_base = pdata->irq_base; |
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chip->irq_features = has_irq; |
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mutex_init(&chip->irq_lock); |
|
|
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ret = devm_request_threaded_irq(&client->dev, client->irq, |
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NULL, max732x_irq_handler, IRQF_ONESHOT | |
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IRQF_TRIGGER_FALLING | IRQF_SHARED, |
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dev_name(&client->dev), chip); |
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if (ret) { |
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dev_err(&client->dev, "failed to request irq %d\n", |
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client->irq); |
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return ret; |
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} |
|
|
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girq = &chip->gpio_chip.irq; |
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girq->chip = &max732x_irq_chip; |
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/* This will let us handle the parent IRQ in the driver */ |
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girq->parent_handler = NULL; |
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girq->num_parents = 0; |
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girq->parents = NULL; |
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girq->default_type = IRQ_TYPE_NONE; |
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girq->handler = handle_simple_irq; |
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girq->threaded = true; |
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girq->first = irq_base; /* FIXME: get rid of this */ |
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} |
|
|
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return 0; |
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} |
|
|
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#else /* CONFIG_GPIO_MAX732X_IRQ */ |
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static int max732x_irq_setup(struct max732x_chip *chip, |
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const struct i2c_device_id *id) |
|
{ |
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struct i2c_client *client = chip->client; |
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struct max732x_platform_data *pdata = dev_get_platdata(&client->dev); |
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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 <[email protected]>"); |
|
MODULE_DESCRIPTION("GPIO expander driver for MAX732X"); |
|
MODULE_LICENSE("GPL");
|
|
|