2010-08-10 19:02:27 -06:00
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/* Copyright (c) 2010, 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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#include <linux/gpio.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/i2c/sx150x.h>
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2015-01-14 17:16:10 -07:00
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/of_gpio.h>
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#include <linux/of_device.h>
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2010-08-10 19:02:27 -06:00
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2011-02-14 10:08:51 -07:00
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#define NO_UPDATE_PENDING -1
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2014-12-04 05:12:09 -07:00
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/* The chip models of sx150x */
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2015-12-15 15:01:34 -07:00
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#define SX150X_123 0
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#define SX150X_456 1
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#define SX150X_789 2
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struct sx150x_123_pri {
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u8 reg_pld_mode;
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u8 reg_pld_table0;
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u8 reg_pld_table1;
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u8 reg_pld_table2;
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u8 reg_pld_table3;
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u8 reg_pld_table4;
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u8 reg_advance;
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};
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2014-12-04 05:12:09 -07:00
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struct sx150x_456_pri {
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u8 reg_pld_mode;
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u8 reg_pld_table0;
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u8 reg_pld_table1;
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u8 reg_pld_table2;
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u8 reg_pld_table3;
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u8 reg_pld_table4;
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u8 reg_advance;
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};
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struct sx150x_789_pri {
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u8 reg_drain;
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u8 reg_polarity;
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u8 reg_clock;
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u8 reg_misc;
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u8 reg_reset;
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u8 ngpios;
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};
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2010-08-10 19:02:27 -06:00
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struct sx150x_device_data {
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u8 model;
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2010-08-10 19:02:27 -06:00
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u8 reg_pullup;
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u8 reg_pulldn;
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u8 reg_dir;
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u8 reg_data;
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u8 reg_irq_mask;
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u8 reg_irq_src;
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u8 reg_sense;
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u8 ngpios;
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union {
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2015-12-15 15:01:34 -07:00
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struct sx150x_123_pri x123;
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struct sx150x_456_pri x456;
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struct sx150x_789_pri x789;
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} pri;
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2010-08-10 19:02:27 -06:00
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};
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struct sx150x_chip {
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struct gpio_chip gpio_chip;
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struct i2c_client *client;
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const struct sx150x_device_data *dev_cfg;
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int irq_summary;
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int irq_base;
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int irq_update;
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u32 irq_sense;
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u32 irq_masked;
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u32 dev_sense;
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u32 dev_masked;
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2010-08-10 19:02:27 -06:00
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struct irq_chip irq_chip;
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struct mutex lock;
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};
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static const struct sx150x_device_data sx150x_devices[] = {
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[0] = { /* sx1508q */
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.model = SX150X_789,
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.reg_pullup = 0x03,
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.reg_pulldn = 0x04,
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.reg_dir = 0x07,
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.reg_data = 0x08,
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.reg_irq_mask = 0x09,
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.reg_irq_src = 0x0c,
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.reg_sense = 0x0b,
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.pri.x789 = {
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.reg_drain = 0x05,
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.reg_polarity = 0x06,
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.reg_clock = 0x0f,
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.reg_misc = 0x10,
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.reg_reset = 0x7d,
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},
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.ngpios = 8,
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2010-08-10 19:02:27 -06:00
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},
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[1] = { /* sx1509q */
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.model = SX150X_789,
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.reg_pullup = 0x07,
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.reg_pulldn = 0x09,
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.reg_dir = 0x0f,
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.reg_data = 0x11,
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.reg_irq_mask = 0x13,
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.reg_irq_src = 0x19,
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.reg_sense = 0x17,
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.pri.x789 = {
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.reg_drain = 0x0b,
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.reg_polarity = 0x0d,
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.reg_clock = 0x1e,
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.reg_misc = 0x1f,
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.reg_reset = 0x7d,
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},
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.ngpios = 16
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},
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[2] = { /* sx1506q */
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.model = SX150X_456,
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.reg_pullup = 0x05,
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.reg_pulldn = 0x07,
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.reg_dir = 0x03,
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.reg_data = 0x01,
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.reg_irq_mask = 0x09,
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.reg_irq_src = 0x0f,
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.reg_sense = 0x0d,
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.pri.x456 = {
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.reg_pld_mode = 0x21,
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.reg_pld_table0 = 0x23,
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.reg_pld_table1 = 0x25,
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.reg_pld_table2 = 0x27,
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.reg_pld_table3 = 0x29,
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.reg_pld_table4 = 0x2b,
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.reg_advance = 0xad,
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},
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.ngpios = 16
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2010-08-10 19:02:27 -06:00
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},
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2015-12-15 15:01:34 -07:00
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[3] = { /* sx1502q */
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.model = SX150X_123,
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.reg_pullup = 0x02,
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.reg_pulldn = 0x03,
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.reg_dir = 0x01,
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.reg_data = 0x00,
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.reg_irq_mask = 0x05,
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.reg_irq_src = 0x08,
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.reg_sense = 0x07,
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.pri.x123 = {
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.reg_pld_mode = 0x10,
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.reg_pld_table0 = 0x11,
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.reg_pld_table1 = 0x12,
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.reg_pld_table2 = 0x13,
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.reg_pld_table3 = 0x14,
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.reg_pld_table4 = 0x15,
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.reg_advance = 0xad,
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},
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.ngpios = 8,
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},
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2010-08-10 19:02:27 -06:00
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};
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static const struct i2c_device_id sx150x_id[] = {
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{"sx1508q", 0},
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{"sx1509q", 1},
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2014-12-04 05:12:09 -07:00
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{"sx1506q", 2},
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2015-12-15 15:01:34 -07:00
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{"sx1502q", 3},
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2010-08-10 19:02:27 -06:00
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{}
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};
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MODULE_DEVICE_TABLE(i2c, sx150x_id);
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2015-01-22 01:45:24 -07:00
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static const struct of_device_id sx150x_of_match[] = {
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2015-01-14 17:16:10 -07:00
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{ .compatible = "semtech,sx1508q" },
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{ .compatible = "semtech,sx1509q" },
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{ .compatible = "semtech,sx1506q" },
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2015-12-15 15:01:34 -07:00
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{ .compatible = "semtech,sx1502q" },
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2015-01-14 17:16:10 -07:00
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{},
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};
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2015-01-22 01:45:24 -07:00
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MODULE_DEVICE_TABLE(of, sx150x_of_match);
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2015-01-14 17:16:10 -07:00
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2010-08-10 19:02:27 -06:00
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static s32 sx150x_i2c_write(struct i2c_client *client, u8 reg, u8 val)
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{
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s32 err = i2c_smbus_write_byte_data(client, reg, val);
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if (err < 0)
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dev_warn(&client->dev,
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"i2c write fail: can't write %02x to %02x: %d\n",
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val, reg, err);
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return err;
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}
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static s32 sx150x_i2c_read(struct i2c_client *client, u8 reg, u8 *val)
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{
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s32 err = i2c_smbus_read_byte_data(client, reg);
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if (err >= 0)
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*val = err;
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else
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dev_warn(&client->dev,
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"i2c read fail: can't read from %02x: %d\n",
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reg, err);
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return err;
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}
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static inline bool offset_is_oscio(struct sx150x_chip *chip, unsigned offset)
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{
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return (chip->dev_cfg->ngpios == offset);
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}
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/*
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* These utility functions solve the common problem of locating and setting
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* configuration bits. Configuration bits are grouped into registers
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* whose indexes increase downwards. For example, with eight-bit registers,
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* sixteen gpios would have their config bits grouped in the following order:
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* REGISTER N-1 [ f e d c b a 9 8 ]
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* N [ 7 6 5 4 3 2 1 0 ]
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*
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* For multi-bit configurations, the pattern gets wider:
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* REGISTER N-3 [ f f e e d d c c ]
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* N-2 [ b b a a 9 9 8 8 ]
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* N-1 [ 7 7 6 6 5 5 4 4 ]
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* N [ 3 3 2 2 1 1 0 0 ]
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*
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* Given the address of the starting register 'N', the index of the gpio
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* whose configuration we seek to change, and the width in bits of that
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* configuration, these functions allow us to locate the correct
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* register and mask the correct bits.
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*/
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static inline void sx150x_find_cfg(u8 offset, u8 width,
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u8 *reg, u8 *mask, u8 *shift)
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{
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*reg -= offset * width / 8;
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*mask = (1 << width) - 1;
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*shift = (offset * width) % 8;
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*mask <<= *shift;
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}
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static s32 sx150x_write_cfg(struct sx150x_chip *chip,
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u8 offset, u8 width, u8 reg, u8 val)
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{
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u8 mask;
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u8 data;
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u8 shift;
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s32 err;
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sx150x_find_cfg(offset, width, ®, &mask, &shift);
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err = sx150x_i2c_read(chip->client, reg, &data);
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if (err < 0)
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return err;
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data &= ~mask;
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data |= (val << shift) & mask;
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return sx150x_i2c_write(chip->client, reg, data);
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}
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static int sx150x_get_io(struct sx150x_chip *chip, unsigned offset)
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{
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u8 reg = chip->dev_cfg->reg_data;
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u8 mask;
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u8 data;
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u8 shift;
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s32 err;
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sx150x_find_cfg(offset, 1, ®, &mask, &shift);
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err = sx150x_i2c_read(chip->client, reg, &data);
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if (err >= 0)
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err = (data & mask) != 0 ? 1 : 0;
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return err;
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}
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static void sx150x_set_oscio(struct sx150x_chip *chip, int val)
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{
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sx150x_i2c_write(chip->client,
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2014-12-04 05:12:09 -07:00
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chip->dev_cfg->pri.x789.reg_clock,
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2010-08-10 19:02:27 -06:00
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(val ? 0x1f : 0x10));
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}
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static void sx150x_set_io(struct sx150x_chip *chip, unsigned offset, int val)
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{
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sx150x_write_cfg(chip,
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offset,
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1,
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chip->dev_cfg->reg_data,
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(val ? 1 : 0));
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}
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static int sx150x_io_input(struct sx150x_chip *chip, unsigned offset)
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{
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return sx150x_write_cfg(chip,
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offset,
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1,
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chip->dev_cfg->reg_dir,
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1);
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}
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static int sx150x_io_output(struct sx150x_chip *chip, unsigned offset, int val)
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{
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int err;
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err = sx150x_write_cfg(chip,
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offset,
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1,
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chip->dev_cfg->reg_data,
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(val ? 1 : 0));
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if (err >= 0)
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err = sx150x_write_cfg(chip,
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offset,
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1,
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chip->dev_cfg->reg_dir,
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0);
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return err;
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}
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static int sx150x_gpio_get(struct gpio_chip *gc, unsigned offset)
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{
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2015-12-07 06:36:31 -07:00
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struct sx150x_chip *chip = gpiochip_get_data(gc);
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2010-08-10 19:02:27 -06:00
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int status = -EINVAL;
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if (!offset_is_oscio(chip, offset)) {
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mutex_lock(&chip->lock);
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status = sx150x_get_io(chip, offset);
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mutex_unlock(&chip->lock);
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}
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2015-12-21 03:41:06 -07:00
|
|
|
return (status < 0) ? status : !!status;
|
2010-08-10 19:02:27 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static void sx150x_gpio_set(struct gpio_chip *gc, unsigned offset, int val)
|
|
|
|
{
|
2015-12-07 06:36:31 -07:00
|
|
|
struct sx150x_chip *chip = gpiochip_get_data(gc);
|
2010-08-10 19:02:27 -06:00
|
|
|
|
|
|
|
mutex_lock(&chip->lock);
|
|
|
|
if (offset_is_oscio(chip, offset))
|
|
|
|
sx150x_set_oscio(chip, val);
|
|
|
|
else
|
|
|
|
sx150x_set_io(chip, offset, val);
|
|
|
|
mutex_unlock(&chip->lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int sx150x_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
|
|
|
|
{
|
2015-12-07 06:36:31 -07:00
|
|
|
struct sx150x_chip *chip = gpiochip_get_data(gc);
|
2010-08-10 19:02:27 -06:00
|
|
|
int status = -EINVAL;
|
|
|
|
|
|
|
|
if (!offset_is_oscio(chip, offset)) {
|
|
|
|
mutex_lock(&chip->lock);
|
|
|
|
status = sx150x_io_input(chip, offset);
|
|
|
|
mutex_unlock(&chip->lock);
|
|
|
|
}
|
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int sx150x_gpio_direction_output(struct gpio_chip *gc,
|
|
|
|
unsigned offset,
|
|
|
|
int val)
|
|
|
|
{
|
2015-12-07 06:36:31 -07:00
|
|
|
struct sx150x_chip *chip = gpiochip_get_data(gc);
|
2010-08-10 19:02:27 -06:00
|
|
|
int status = 0;
|
|
|
|
|
|
|
|
if (!offset_is_oscio(chip, offset)) {
|
|
|
|
mutex_lock(&chip->lock);
|
|
|
|
status = sx150x_io_output(chip, offset, val);
|
|
|
|
mutex_unlock(&chip->lock);
|
|
|
|
}
|
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
2011-01-12 18:00:18 -07:00
|
|
|
static void sx150x_irq_mask(struct irq_data *d)
|
2010-08-10 19:02:27 -06:00
|
|
|
{
|
2015-12-07 06:36:31 -07:00
|
|
|
struct sx150x_chip *chip = gpiochip_get_data(irq_data_get_irq_chip_data(d));
|
2014-12-04 05:12:08 -07:00
|
|
|
unsigned n = d->hwirq;
|
2010-08-10 19:02:27 -06:00
|
|
|
|
2011-02-14 10:08:51 -07:00
|
|
|
chip->irq_masked |= (1 << n);
|
|
|
|
chip->irq_update = n;
|
2010-08-10 19:02:27 -06:00
|
|
|
}
|
|
|
|
|
2011-01-12 18:00:18 -07:00
|
|
|
static void sx150x_irq_unmask(struct irq_data *d)
|
2010-08-10 19:02:27 -06:00
|
|
|
{
|
2015-12-07 06:36:31 -07:00
|
|
|
struct sx150x_chip *chip = gpiochip_get_data(irq_data_get_irq_chip_data(d));
|
2014-12-04 05:12:08 -07:00
|
|
|
unsigned n = d->hwirq;
|
2010-08-10 19:02:27 -06:00
|
|
|
|
2011-02-14 10:08:51 -07:00
|
|
|
chip->irq_masked &= ~(1 << n);
|
|
|
|
chip->irq_update = n;
|
2010-08-10 19:02:27 -06:00
|
|
|
}
|
|
|
|
|
2011-01-12 18:00:18 -07:00
|
|
|
static int sx150x_irq_set_type(struct irq_data *d, unsigned int flow_type)
|
2010-08-10 19:02:27 -06:00
|
|
|
{
|
2015-12-07 06:36:31 -07:00
|
|
|
struct sx150x_chip *chip = gpiochip_get_data(irq_data_get_irq_chip_data(d));
|
2010-08-10 19:02:27 -06:00
|
|
|
unsigned n, val = 0;
|
|
|
|
|
|
|
|
if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
|
|
|
|
return -EINVAL;
|
|
|
|
|
2014-12-04 05:12:08 -07:00
|
|
|
n = d->hwirq;
|
2010-08-10 19:02:27 -06:00
|
|
|
|
|
|
|
if (flow_type & IRQ_TYPE_EDGE_RISING)
|
|
|
|
val |= 0x1;
|
|
|
|
if (flow_type & IRQ_TYPE_EDGE_FALLING)
|
|
|
|
val |= 0x2;
|
|
|
|
|
|
|
|
chip->irq_sense &= ~(3UL << (n * 2));
|
|
|
|
chip->irq_sense |= val << (n * 2);
|
2011-02-14 10:08:51 -07:00
|
|
|
chip->irq_update = n;
|
2010-08-10 19:02:27 -06:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
|
|
|
|
{
|
|
|
|
struct sx150x_chip *chip = (struct sx150x_chip *)dev_id;
|
|
|
|
unsigned nhandled = 0;
|
|
|
|
unsigned sub_irq;
|
|
|
|
unsigned n;
|
|
|
|
s32 err;
|
|
|
|
u8 val;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = (chip->dev_cfg->ngpios / 8) - 1; i >= 0; --i) {
|
|
|
|
err = sx150x_i2c_read(chip->client,
|
|
|
|
chip->dev_cfg->reg_irq_src - i,
|
|
|
|
&val);
|
|
|
|
if (err < 0)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
sx150x_i2c_write(chip->client,
|
|
|
|
chip->dev_cfg->reg_irq_src - i,
|
|
|
|
val);
|
|
|
|
for (n = 0; n < 8; ++n) {
|
|
|
|
if (val & (1 << n)) {
|
2014-12-04 05:12:08 -07:00
|
|
|
sub_irq = irq_find_mapping(
|
|
|
|
chip->gpio_chip.irqdomain,
|
|
|
|
(i * 8) + n);
|
2010-08-10 19:02:27 -06:00
|
|
|
handle_nested_irq(sub_irq);
|
|
|
|
++nhandled;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE);
|
|
|
|
}
|
|
|
|
|
2011-01-12 18:00:18 -07:00
|
|
|
static void sx150x_irq_bus_lock(struct irq_data *d)
|
2010-08-10 19:02:27 -06:00
|
|
|
{
|
2015-12-07 06:36:31 -07:00
|
|
|
struct sx150x_chip *chip = gpiochip_get_data(irq_data_get_irq_chip_data(d));
|
2010-08-10 19:02:27 -06:00
|
|
|
|
|
|
|
mutex_lock(&chip->lock);
|
|
|
|
}
|
|
|
|
|
2011-01-12 18:00:18 -07:00
|
|
|
static void sx150x_irq_bus_sync_unlock(struct irq_data *d)
|
2010-08-10 19:02:27 -06:00
|
|
|
{
|
2015-12-07 06:36:31 -07:00
|
|
|
struct sx150x_chip *chip = gpiochip_get_data(irq_data_get_irq_chip_data(d));
|
2010-08-10 19:02:27 -06:00
|
|
|
unsigned n;
|
|
|
|
|
2011-02-14 10:08:51 -07:00
|
|
|
if (chip->irq_update == NO_UPDATE_PENDING)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
n = chip->irq_update;
|
|
|
|
chip->irq_update = NO_UPDATE_PENDING;
|
2010-08-10 19:02:27 -06:00
|
|
|
|
2011-02-14 10:08:51 -07:00
|
|
|
/* Avoid updates if nothing changed */
|
|
|
|
if (chip->dev_sense == chip->irq_sense &&
|
2014-12-15 23:22:27 -07:00
|
|
|
chip->dev_masked == chip->irq_masked)
|
2011-02-14 10:08:51 -07:00
|
|
|
goto out;
|
|
|
|
|
|
|
|
chip->dev_sense = chip->irq_sense;
|
|
|
|
chip->dev_masked = chip->irq_masked;
|
|
|
|
|
|
|
|
if (chip->irq_masked & (1 << n)) {
|
|
|
|
sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 1);
|
|
|
|
sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense, 0);
|
|
|
|
} else {
|
|
|
|
sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 0);
|
|
|
|
sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense,
|
|
|
|
chip->irq_sense >> (n * 2));
|
|
|
|
}
|
|
|
|
out:
|
2010-08-10 19:02:27 -06:00
|
|
|
mutex_unlock(&chip->lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void sx150x_init_chip(struct sx150x_chip *chip,
|
|
|
|
struct i2c_client *client,
|
|
|
|
kernel_ulong_t driver_data,
|
|
|
|
struct sx150x_platform_data *pdata)
|
|
|
|
{
|
|
|
|
mutex_init(&chip->lock);
|
|
|
|
|
|
|
|
chip->client = client;
|
|
|
|
chip->dev_cfg = &sx150x_devices[driver_data];
|
2015-11-04 01:56:26 -07:00
|
|
|
chip->gpio_chip.parent = &client->dev;
|
2010-08-10 19:02:27 -06:00
|
|
|
chip->gpio_chip.label = client->name;
|
|
|
|
chip->gpio_chip.direction_input = sx150x_gpio_direction_input;
|
|
|
|
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.base = pdata->gpio_base;
|
2013-12-04 06:42:46 -07:00
|
|
|
chip->gpio_chip.can_sleep = true;
|
2010-08-10 19:02:27 -06:00
|
|
|
chip->gpio_chip.ngpio = chip->dev_cfg->ngpios;
|
2015-01-22 01:45:24 -07:00
|
|
|
#ifdef CONFIG_OF_GPIO
|
2015-01-14 17:16:10 -07:00
|
|
|
chip->gpio_chip.of_node = client->dev.of_node;
|
|
|
|
chip->gpio_chip.of_gpio_n_cells = 2;
|
2015-01-22 01:45:24 -07:00
|
|
|
#endif
|
2010-08-10 19:02:27 -06:00
|
|
|
if (pdata->oscio_is_gpo)
|
|
|
|
++chip->gpio_chip.ngpio;
|
|
|
|
|
2011-01-12 18:00:18 -07:00
|
|
|
chip->irq_chip.name = client->name;
|
|
|
|
chip->irq_chip.irq_mask = sx150x_irq_mask;
|
|
|
|
chip->irq_chip.irq_unmask = sx150x_irq_unmask;
|
|
|
|
chip->irq_chip.irq_set_type = sx150x_irq_set_type;
|
|
|
|
chip->irq_chip.irq_bus_lock = sx150x_irq_bus_lock;
|
|
|
|
chip->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock;
|
|
|
|
chip->irq_summary = -1;
|
|
|
|
chip->irq_base = -1;
|
2011-02-14 10:08:51 -07:00
|
|
|
chip->irq_masked = ~0;
|
2011-01-12 18:00:18 -07:00
|
|
|
chip->irq_sense = 0;
|
2011-02-14 10:08:51 -07:00
|
|
|
chip->dev_masked = ~0;
|
|
|
|
chip->dev_sense = 0;
|
|
|
|
chip->irq_update = NO_UPDATE_PENDING;
|
2010-08-10 19:02:27 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static int sx150x_init_io(struct sx150x_chip *chip, u8 base, u16 cfg)
|
|
|
|
{
|
|
|
|
int err = 0;
|
|
|
|
unsigned n;
|
|
|
|
|
|
|
|
for (n = 0; err >= 0 && n < (chip->dev_cfg->ngpios / 8); ++n)
|
|
|
|
err = sx150x_i2c_write(chip->client, base - n, cfg >> (n * 8));
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
gpio: sx150x: correct and refine reset-on-probe behavior
Replace the arbitrary software-reset call from the device-probe
method, because:
- It is defective. To work correctly, it should be two byte writes,
not a single word write. As it stands, it does nothing.
- Some devices with sx150x expanders installed have their NRESET pins
ganged on the same line, so resetting one causes the others to reset -
not a nice thing to do arbitrarily!
- The probe, usually taking place at boot, implies a recent hard-reset,
so a software reset at this point is just a waste of energy anyway.
Therefore, make it optional, defaulting to off, as this will match the
common case of probing at powerup and also matches the current broken
no-op behavior.
Signed-off-by: Gregory Bean <gbean@codeaurora.org>
Reviewed-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-09 17:38:02 -06:00
|
|
|
static int sx150x_reset(struct sx150x_chip *chip)
|
2010-08-10 19:02:27 -06:00
|
|
|
{
|
gpio: sx150x: correct and refine reset-on-probe behavior
Replace the arbitrary software-reset call from the device-probe
method, because:
- It is defective. To work correctly, it should be two byte writes,
not a single word write. As it stands, it does nothing.
- Some devices with sx150x expanders installed have their NRESET pins
ganged on the same line, so resetting one causes the others to reset -
not a nice thing to do arbitrarily!
- The probe, usually taking place at boot, implies a recent hard-reset,
so a software reset at this point is just a waste of energy anyway.
Therefore, make it optional, defaulting to off, as this will match the
common case of probing at powerup and also matches the current broken
no-op behavior.
Signed-off-by: Gregory Bean <gbean@codeaurora.org>
Reviewed-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-09 17:38:02 -06:00
|
|
|
int err;
|
2010-08-10 19:02:27 -06:00
|
|
|
|
gpio: sx150x: correct and refine reset-on-probe behavior
Replace the arbitrary software-reset call from the device-probe
method, because:
- It is defective. To work correctly, it should be two byte writes,
not a single word write. As it stands, it does nothing.
- Some devices with sx150x expanders installed have their NRESET pins
ganged on the same line, so resetting one causes the others to reset -
not a nice thing to do arbitrarily!
- The probe, usually taking place at boot, implies a recent hard-reset,
so a software reset at this point is just a waste of energy anyway.
Therefore, make it optional, defaulting to off, as this will match the
common case of probing at powerup and also matches the current broken
no-op behavior.
Signed-off-by: Gregory Bean <gbean@codeaurora.org>
Reviewed-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-09 17:38:02 -06:00
|
|
|
err = i2c_smbus_write_byte_data(chip->client,
|
2014-12-04 05:12:09 -07:00
|
|
|
chip->dev_cfg->pri.x789.reg_reset,
|
gpio: sx150x: correct and refine reset-on-probe behavior
Replace the arbitrary software-reset call from the device-probe
method, because:
- It is defective. To work correctly, it should be two byte writes,
not a single word write. As it stands, it does nothing.
- Some devices with sx150x expanders installed have their NRESET pins
ganged on the same line, so resetting one causes the others to reset -
not a nice thing to do arbitrarily!
- The probe, usually taking place at boot, implies a recent hard-reset,
so a software reset at this point is just a waste of energy anyway.
Therefore, make it optional, defaulting to off, as this will match the
common case of probing at powerup and also matches the current broken
no-op behavior.
Signed-off-by: Gregory Bean <gbean@codeaurora.org>
Reviewed-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-09 17:38:02 -06:00
|
|
|
0x12);
|
2010-08-10 19:02:27 -06:00
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
|
gpio: sx150x: correct and refine reset-on-probe behavior
Replace the arbitrary software-reset call from the device-probe
method, because:
- It is defective. To work correctly, it should be two byte writes,
not a single word write. As it stands, it does nothing.
- Some devices with sx150x expanders installed have their NRESET pins
ganged on the same line, so resetting one causes the others to reset -
not a nice thing to do arbitrarily!
- The probe, usually taking place at boot, implies a recent hard-reset,
so a software reset at this point is just a waste of energy anyway.
Therefore, make it optional, defaulting to off, as this will match the
common case of probing at powerup and also matches the current broken
no-op behavior.
Signed-off-by: Gregory Bean <gbean@codeaurora.org>
Reviewed-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-09 17:38:02 -06:00
|
|
|
err = i2c_smbus_write_byte_data(chip->client,
|
2014-12-04 05:12:09 -07:00
|
|
|
chip->dev_cfg->pri.x789.reg_reset,
|
gpio: sx150x: correct and refine reset-on-probe behavior
Replace the arbitrary software-reset call from the device-probe
method, because:
- It is defective. To work correctly, it should be two byte writes,
not a single word write. As it stands, it does nothing.
- Some devices with sx150x expanders installed have their NRESET pins
ganged on the same line, so resetting one causes the others to reset -
not a nice thing to do arbitrarily!
- The probe, usually taking place at boot, implies a recent hard-reset,
so a software reset at this point is just a waste of energy anyway.
Therefore, make it optional, defaulting to off, as this will match the
common case of probing at powerup and also matches the current broken
no-op behavior.
Signed-off-by: Gregory Bean <gbean@codeaurora.org>
Reviewed-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-09 17:38:02 -06:00
|
|
|
0x34);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int sx150x_init_hw(struct sx150x_chip *chip,
|
|
|
|
struct sx150x_platform_data *pdata)
|
|
|
|
{
|
|
|
|
int err = 0;
|
|
|
|
|
|
|
|
if (pdata->reset_during_probe) {
|
|
|
|
err = sx150x_reset(chip);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2014-12-04 05:12:09 -07:00
|
|
|
if (chip->dev_cfg->model == SX150X_789)
|
|
|
|
err = sx150x_i2c_write(chip->client,
|
|
|
|
chip->dev_cfg->pri.x789.reg_misc,
|
|
|
|
0x01);
|
2015-12-15 15:01:34 -07:00
|
|
|
else if (chip->dev_cfg->model == SX150X_456)
|
2014-12-04 05:12:09 -07:00
|
|
|
err = sx150x_i2c_write(chip->client,
|
|
|
|
chip->dev_cfg->pri.x456.reg_advance,
|
|
|
|
0x04);
|
2015-12-15 15:01:34 -07:00
|
|
|
else
|
|
|
|
err = sx150x_i2c_write(chip->client,
|
|
|
|
chip->dev_cfg->pri.x123.reg_advance,
|
|
|
|
0x00);
|
2010-08-10 19:02:27 -06:00
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
err = sx150x_init_io(chip, chip->dev_cfg->reg_pullup,
|
|
|
|
pdata->io_pullup_ena);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
err = sx150x_init_io(chip, chip->dev_cfg->reg_pulldn,
|
|
|
|
pdata->io_pulldn_ena);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
|
2014-12-04 05:12:09 -07:00
|
|
|
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)
|
|
|
|
return err;
|
2015-12-15 15:01:34 -07:00
|
|
|
} else if (chip->dev_cfg->model == SX150X_456) {
|
2014-12-04 05:12:09 -07:00
|
|
|
/* Set all pins to work in normal mode */
|
|
|
|
err = sx150x_init_io(chip,
|
|
|
|
chip->dev_cfg->pri.x456.reg_pld_mode,
|
|
|
|
0);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
2015-12-15 15:01:34 -07:00
|
|
|
} else {
|
|
|
|
/* Set all pins to work in normal mode */
|
|
|
|
err = sx150x_init_io(chip,
|
|
|
|
chip->dev_cfg->pri.x123.reg_pld_mode,
|
|
|
|
0);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
2014-12-04 05:12:09 -07:00
|
|
|
}
|
2010-08-10 19:02:27 -06:00
|
|
|
|
|
|
|
|
|
|
|
if (pdata->oscio_is_gpo)
|
|
|
|
sx150x_set_oscio(chip, 0);
|
|
|
|
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int sx150x_install_irq_chip(struct sx150x_chip *chip,
|
|
|
|
int irq_summary,
|
|
|
|
int irq_base)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
|
|
|
|
chip->irq_summary = irq_summary;
|
|
|
|
chip->irq_base = irq_base;
|
|
|
|
|
2014-12-04 05:12:08 -07:00
|
|
|
/* Add gpio chip to irq subsystem */
|
|
|
|
err = gpiochip_irqchip_add(&chip->gpio_chip,
|
|
|
|
&chip->irq_chip, chip->irq_base,
|
|
|
|
handle_edge_irq, IRQ_TYPE_EDGE_BOTH);
|
|
|
|
if (err) {
|
|
|
|
dev_err(&chip->client->dev,
|
|
|
|
"could not connect irqchip to gpiochip\n");
|
|
|
|
return err;
|
2010-08-10 19:02:27 -06:00
|
|
|
}
|
|
|
|
|
2013-05-28 16:02:50 -06:00
|
|
|
err = devm_request_threaded_irq(&chip->client->dev,
|
2014-12-04 05:12:08 -07:00
|
|
|
irq_summary, NULL, sx150x_irq_thread_fn,
|
|
|
|
IRQF_ONESHOT | IRQF_SHARED | IRQF_TRIGGER_FALLING,
|
|
|
|
chip->irq_chip.name, chip);
|
2010-08-10 19:02:27 -06:00
|
|
|
if (err < 0) {
|
|
|
|
chip->irq_summary = -1;
|
|
|
|
chip->irq_base = -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2012-11-19 11:22:34 -07:00
|
|
|
static int sx150x_probe(struct i2c_client *client,
|
2010-08-10 19:02:27 -06:00
|
|
|
const struct i2c_device_id *id)
|
|
|
|
{
|
|
|
|
static const u32 i2c_funcs = I2C_FUNC_SMBUS_BYTE_DATA |
|
|
|
|
I2C_FUNC_SMBUS_WRITE_WORD_DATA;
|
|
|
|
struct sx150x_platform_data *pdata;
|
|
|
|
struct sx150x_chip *chip;
|
|
|
|
int rc;
|
|
|
|
|
2013-07-30 02:08:05 -06:00
|
|
|
pdata = dev_get_platdata(&client->dev);
|
2010-08-10 19:02:27 -06:00
|
|
|
if (!pdata)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
if (!i2c_check_functionality(client->adapter, i2c_funcs))
|
|
|
|
return -ENOSYS;
|
|
|
|
|
2013-05-28 16:02:50 -06:00
|
|
|
chip = devm_kzalloc(&client->dev,
|
|
|
|
sizeof(struct sx150x_chip), GFP_KERNEL);
|
2010-08-10 19:02:27 -06:00
|
|
|
if (!chip)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
sx150x_init_chip(chip, client, id->driver_data, pdata);
|
|
|
|
rc = sx150x_init_hw(chip, pdata);
|
|
|
|
if (rc < 0)
|
2013-05-28 16:02:50 -06:00
|
|
|
return rc;
|
2010-08-10 19:02:27 -06:00
|
|
|
|
2016-02-22 05:13:28 -07:00
|
|
|
rc = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
|
2013-05-28 16:02:50 -06:00
|
|
|
if (rc)
|
|
|
|
return rc;
|
2010-08-10 19:02:27 -06:00
|
|
|
|
|
|
|
if (pdata->irq_summary >= 0) {
|
|
|
|
rc = sx150x_install_irq_chip(chip,
|
|
|
|
pdata->irq_summary,
|
|
|
|
pdata->irq_base);
|
|
|
|
if (rc < 0)
|
2016-02-22 05:13:28 -07:00
|
|
|
return rc;
|
2010-08-10 19:02:27 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
i2c_set_clientdata(client, chip);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct i2c_driver sx150x_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = "sx150x",
|
2015-01-22 01:45:24 -07:00
|
|
|
.of_match_table = of_match_ptr(sx150x_of_match),
|
2010-08-10 19:02:27 -06:00
|
|
|
},
|
|
|
|
.probe = sx150x_probe,
|
|
|
|
.id_table = sx150x_id,
|
|
|
|
};
|
|
|
|
|
|
|
|
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");
|