0ba63b86ba
Add a gpio_chip driver to support the Qualcomm SPMI PMIC architecture called QPNP. The driver supports Device Tree and allows a device_node to be registered as a gpio-controller. The driver also specifies APIs to allow a non-Device Tree user the ability to configure the PMIC GPIOs. This driver does not handle interrupts for GPIOs directly. Instead, that work is handled by the existing qpnp-int driver. This is feasible since the interrupt register map for all QPNP peripherals is the same. Change-Id: I04eb39d9855b0957f0647010fcb203ec2fc83c7c Signed-off-by: Michael Bohan <mbohan@codeaurora.org>
115 lines
4.1 KiB
C
115 lines
4.1 KiB
C
/* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <mach/qpnp.h>
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#define QPNP_GPIO_DIR_OUT 1
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#define QPNP_GPIO_DIR_IN 2
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#define QPNP_GPIO_DIR_BOTH (QPNP_GPIO_DIR_OUT | QPNP_GPIO_DIR_IN)
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#define QPNP_GPIO_OUT_BUF_OPEN_DRAIN 1
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#define QPNP_GPIO_OUT_BUF_CMOS 0
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#define QPNP_GPIO_VIN0 0
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#define QPNP_GPIO_VIN1 1
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#define QPNP_GPIO_VIN2 2
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#define QPNP_GPIO_VIN3 3
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#define QPNP_GPIO_VIN4 4
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#define QPNP_GPIO_VIN5 5
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#define QPNP_GPIO_VIN6 6
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#define QPNP_GPIO_VIN7 7
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#define QPNP_GPIO_PULL_UP_30 0
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#define QPNP_GPIO_PULL_UP_1P5 1
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#define QPNP_GPIO_PULL_UP_31P5 2
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#define QPNP_GPIO_PULL_UP_1P5_30 3
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#define QPNP_GPIO_PULL_DN 4
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#define QPNP_GPIO_PULL_NO 5
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#define QPNP_GPIO_OUT_STRENGTH_LOW 1
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#define QPNP_GPIO_OUT_STRENGTH_MED 2
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#define QPNP_GPIO_OUT_STRENGTH_HIGH 3
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#define QPNP_GPIO_FUNC_NORMAL 0
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#define QPNP_GPIO_FUNC_PAIRED 1
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#define QPNP_GPIO_FUNC_1 2
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#define QPNP_GPIO_FUNC_2 3
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#define QPNP_GPIO_DTEST1 4
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#define QPNP_GPIO_DTEST2 5
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#define QPNP_GPIO_DTEST3 6
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#define QPNP_GPIO_DTEST4 7
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/**
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* struct qpnp_gpio_cfg - structure to specify gpio configurtion values
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* @direction: indicates whether the gpio should be input, output, or
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* both. Should be of the type QPNP_GPIO_DIR_*
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* @output_type: indicates gpio should be configured as CMOS or open
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* drain. Should be of the type QPNP_GPIO_OUT_BUF_*
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* @output_value: The gpio output value of the gpio line - 0 or 1
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* @pull: Indicates whether a pull up or pull down should be
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* applied. If a pullup is required the current strength
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* needs to be specified. Current values of 30uA, 1.5uA,
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* 31.5uA, 1.5uA with 30uA boost are supported. This value
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* should be one of the QPNP_GPIO_PULL_*
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* @vin_sel: specifies the voltage level when the output is set to 1.
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* For an input gpio specifies the voltage level at which
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* the input is interpreted as a logical 1.
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* @out_strength: the amount of current supplied for an output gpio,
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* should be of the type QPNP_GPIO_STRENGTH_*
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* @source_sel: choose alternate function for the gpio. Certain gpios
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* can be paired (shorted) with each other. Some gpio pin
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* can act as alternate functions. This parameter should
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* be of type QPNP_GPIO_FUNC_*
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* @inv_int_pol: Invert polarity before feeding the line to the interrupt
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* module in pmic. This feature will almost be never used
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* since the pm8xxx interrupt block can detect both edges
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* and both levels.
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* @master_en: 1 = Enable features within the GPIO block based on
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* configurations.
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* 0 = Completely disable the GPIO block and let the pin
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* float with high impedance regardless of other settings.
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*/
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struct qpnp_gpio_cfg {
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int direction;
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int output_type;
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int output_value;
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int pull;
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int vin_sel;
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int out_strength;
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int src_select;
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int inv_int_pol;
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int master_en;
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};
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/**
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* qpnp_gpio_config - Apply gpio configuration for Linux gpio
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* @gpio: Linux gpio number to configure.
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* @param: parameters to configure.
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*
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* This routine takes a Linux gpio number that corresponds with a
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* PMIC gpio and applies the configuration specified in 'param'.
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* This gpio number can be ascertained by of_get_gpio_flags() or
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* the qpnp_gpio_map_gpio() API.
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*/
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int qpnp_gpio_config(int gpio, struct qpnp_gpio_cfg *param);
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/**
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* qpnp_gpio_map_gpio - Obtain Linux GPIO number from device spec
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* @slave_id: slave_id of the spmi_device for the gpio in question.
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* @pmic_gpio: PMIC gpio number to lookup.
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*
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* This routine is used in legacy configurations that do not support
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* Device Tree. If you are using Device Tree, you should not use this.
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* For such cases, use of_get_gpio() instead.
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*/
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int qpnp_gpio_map_gpio(uint16_t slave_id, uint32_t pmic_gpio);
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