diff options
Diffstat (limited to 'drivers/gpio/gpio-sx150x.c')
| -rw-r--r-- | drivers/gpio/gpio-sx150x.c | 100 |
1 files changed, 82 insertions, 18 deletions
diff --git a/drivers/gpio/gpio-sx150x.c b/drivers/gpio/gpio-sx150x.c index d387eb524bf3..a177ebd921d5 100644 --- a/drivers/gpio/gpio-sx150x.c +++ b/drivers/gpio/gpio-sx150x.c @@ -1,5 +1,9 @@ /* Copyright (c) 2010, Code Aurora Forum. All rights reserved. * + * Driver for Semtech SX150X I2C GPIO Expanders + * + * Author: Gregory Bean <gbean@codeaurora.org> + * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only version 2 as published by the Free Software Foundation. @@ -19,10 +23,8 @@ #include <linux/init.h> #include <linux/interrupt.h> #include <linux/irq.h> -#include <linux/module.h> #include <linux/mutex.h> #include <linux/slab.h> -#include <linux/i2c/sx150x.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/of_irq.h> @@ -82,6 +84,57 @@ struct sx150x_device_data { } pri; }; +/** + * struct sx150x_platform_data - config data for SX150x driver + * @gpio_base: The index number of the first GPIO assigned to this + * GPIO expander. The expander will create a block of + * consecutively numbered gpios beginning at the given base, + * with the size of the block depending on the model of the + * expander chip. + * @oscio_is_gpo: If set to true, the driver will configure OSCIO as a GPO + * instead of as an oscillator, increasing the size of the + * GP(I)O pool created by this expander by one. The + * output-only GPO pin will be added at the end of the block. + * @io_pullup_ena: A bit-mask which enables or disables the pull-up resistor + * for each IO line in the expander. Setting the bit at + * position n will enable the pull-up for the IO at + * the corresponding offset. For chips with fewer than + * 16 IO pins, high-end bits are ignored. + * @io_pulldn_ena: A bit-mask which enables-or disables the pull-down + * resistor for each IO line in the expander. Setting the + * bit at position n will enable the pull-down for the IO at + * the corresponding offset. For chips with fewer than + * 16 IO pins, high-end bits are ignored. + * @io_polarity: A bit-mask which enables polarity inversion for each IO line + * in the expander. Setting the bit at position n inverts + * the polarity of that IO line, while clearing it results + * in normal polarity. For chips with fewer than 16 IO pins, + * high-end bits are ignored. + * @irq_summary: The 'summary IRQ' line to which the GPIO expander's INT line + * is connected, via which it reports interrupt events + * across all GPIO lines. This must be a real, + * pre-existing IRQ line. + * Setting this value < 0 disables the irq_chip functionality + * of the driver. + * @irq_base: The first 'virtual IRQ' line at which our block of GPIO-based + * IRQ lines will appear. Similarly to gpio_base, the expander + * will create a block of irqs beginning at this number. + * This value is ignored if irq_summary is < 0. + * @reset_during_probe: If set to true, the driver will trigger a full + * reset of the chip at the beginning of the probe + * in order to place it in a known state. + */ +struct sx150x_platform_data { + unsigned gpio_base; + bool oscio_is_gpo; + u16 io_pullup_ena; + u16 io_pulldn_ena; + u16 io_polarity; + int irq_summary; + unsigned irq_base; + bool reset_during_probe; +}; + struct sx150x_chip { struct gpio_chip gpio_chip; struct i2c_client *client; @@ -354,6 +407,32 @@ static void sx150x_gpio_set(struct gpio_chip *gc, unsigned offset, int val) mutex_unlock(&chip->lock); } +static int sx150x_gpio_set_single_ended(struct gpio_chip *gc, + unsigned offset, + enum single_ended_mode mode) +{ + struct sx150x_chip *chip = gpiochip_get_data(gc); + + /* On the SX160X 789 we can set open drain */ + if (chip->dev_cfg->model != SX150X_789) + return -ENOTSUPP; + + if (mode == LINE_MODE_PUSH_PULL) + return sx150x_write_cfg(chip, + offset, + 1, + chip->dev_cfg->pri.x789.reg_drain, + 0); + + if (mode == LINE_MODE_OPEN_DRAIN) + return sx150x_write_cfg(chip, + offset, + 1, + chip->dev_cfg->pri.x789.reg_drain, + 1); + return -ENOTSUPP; +} + static int sx150x_gpio_direction_input(struct gpio_chip *gc, unsigned offset) { struct sx150x_chip *chip = gpiochip_get_data(gc); @@ -508,6 +587,7 @@ static void sx150x_init_chip(struct sx150x_chip *chip, chip->gpio_chip.direction_output = sx150x_gpio_direction_output; chip->gpio_chip.get = sx150x_gpio_get; chip->gpio_chip.set = sx150x_gpio_set; + chip->gpio_chip.set_single_ended = sx150x_gpio_set_single_ended; chip->gpio_chip.base = pdata->gpio_base; chip->gpio_chip.can_sleep = true; chip->gpio_chip.ngpio = chip->dev_cfg->ngpios; @@ -597,12 +677,6 @@ static int sx150x_init_hw(struct sx150x_chip *chip, if (chip->dev_cfg->model == SX150X_789) { err = sx150x_init_io(chip, - chip->dev_cfg->pri.x789.reg_drain, - pdata->io_open_drain_ena); - if (err < 0) - return err; - - err = sx150x_init_io(chip, chip->dev_cfg->pri.x789.reg_polarity, pdata->io_polarity); if (err < 0) @@ -718,13 +792,3 @@ static int __init sx150x_init(void) return i2c_add_driver(&sx150x_driver); } subsys_initcall(sx150x_init); - -static void __exit sx150x_exit(void) -{ - return i2c_del_driver(&sx150x_driver); -} -module_exit(sx150x_exit); - -MODULE_AUTHOR("Gregory Bean <gbean@codeaurora.org>"); -MODULE_DESCRIPTION("Driver for Semtech SX150X I2C GPIO Expanders"); -MODULE_LICENSE("GPL v2"); |