669 lines
15 KiB
C
669 lines
15 KiB
C
/* 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/workqueue.h>
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#include <linux/i2c/sx150x.h>
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#define NO_UPDATE_PENDING -1
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struct sx150x_device_data {
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u8 reg_pullup;
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u8 reg_pulldn;
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u8 reg_drain;
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u8 reg_polarity;
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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 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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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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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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.reg_pullup = 0x03,
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.reg_pulldn = 0x04,
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.reg_drain = 0x05,
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.reg_polarity = 0x06,
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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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.reg_clock = 0x0f,
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.reg_misc = 0x10,
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.reg_reset = 0x7d,
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.ngpios = 8
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},
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[1] = { /* sx1509q */
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.reg_pullup = 0x07,
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.reg_pulldn = 0x09,
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.reg_drain = 0x0b,
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.reg_polarity = 0x0d,
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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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.reg_clock = 0x1e,
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.reg_misc = 0x1f,
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.reg_reset = 0x7d,
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.ngpios = 16
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},
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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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{}
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};
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MODULE_DEVICE_TABLE(i2c, sx150x_id);
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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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chip->dev_cfg->reg_clock,
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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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struct sx150x_chip *chip;
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int status = -EINVAL;
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chip = container_of(gc, struct sx150x_chip, gpio_chip);
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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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return status;
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}
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static void sx150x_gpio_set(struct gpio_chip *gc, unsigned offset, int val)
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{
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struct sx150x_chip *chip;
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chip = container_of(gc, struct sx150x_chip, gpio_chip);
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mutex_lock(&chip->lock);
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if (offset_is_oscio(chip, offset))
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sx150x_set_oscio(chip, val);
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else
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sx150x_set_io(chip, offset, val);
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mutex_unlock(&chip->lock);
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}
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static int sx150x_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
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{
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struct sx150x_chip *chip;
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int status = -EINVAL;
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chip = container_of(gc, struct sx150x_chip, gpio_chip);
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if (!offset_is_oscio(chip, offset)) {
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mutex_lock(&chip->lock);
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status = sx150x_io_input(chip, offset);
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mutex_unlock(&chip->lock);
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}
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return status;
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}
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static int sx150x_gpio_direction_output(struct gpio_chip *gc,
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unsigned offset,
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int val)
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{
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struct sx150x_chip *chip;
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int status = 0;
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chip = container_of(gc, struct sx150x_chip, gpio_chip);
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if (!offset_is_oscio(chip, offset)) {
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mutex_lock(&chip->lock);
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status = sx150x_io_output(chip, offset, val);
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mutex_unlock(&chip->lock);
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}
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return status;
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}
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static int sx150x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
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{
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struct sx150x_chip *chip;
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chip = container_of(gc, struct sx150x_chip, gpio_chip);
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if (offset >= chip->dev_cfg->ngpios)
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return -EINVAL;
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if (chip->irq_base < 0)
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return -EINVAL;
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return chip->irq_base + offset;
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}
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static void sx150x_irq_mask(struct irq_data *d)
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{
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struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
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unsigned n;
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n = d->irq - chip->irq_base;
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chip->irq_masked |= (1 << n);
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chip->irq_update = n;
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}
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static void sx150x_irq_unmask(struct irq_data *d)
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{
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struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
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unsigned n;
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n = d->irq - chip->irq_base;
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chip->irq_masked &= ~(1 << n);
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chip->irq_update = n;
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}
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static int sx150x_irq_set_type(struct irq_data *d, unsigned int flow_type)
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{
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struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
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unsigned n, val = 0;
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if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
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return -EINVAL;
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n = d->irq - chip->irq_base;
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if (flow_type & IRQ_TYPE_EDGE_RISING)
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val |= 0x1;
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if (flow_type & IRQ_TYPE_EDGE_FALLING)
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val |= 0x2;
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chip->irq_sense &= ~(3UL << (n * 2));
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chip->irq_sense |= val << (n * 2);
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chip->irq_update = n;
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return 0;
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}
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static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
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{
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struct sx150x_chip *chip = (struct sx150x_chip *)dev_id;
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unsigned nhandled = 0;
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unsigned sub_irq;
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unsigned n;
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s32 err;
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u8 val;
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int i;
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for (i = (chip->dev_cfg->ngpios / 8) - 1; i >= 0; --i) {
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err = sx150x_i2c_read(chip->client,
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chip->dev_cfg->reg_irq_src - i,
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&val);
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if (err < 0)
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continue;
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sx150x_i2c_write(chip->client,
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chip->dev_cfg->reg_irq_src - i,
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val);
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for (n = 0; n < 8; ++n) {
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if (val & (1 << n)) {
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sub_irq = chip->irq_base + (i * 8) + n;
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handle_nested_irq(sub_irq);
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++nhandled;
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}
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}
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}
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return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE);
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}
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static void sx150x_irq_bus_lock(struct irq_data *d)
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{
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struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
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mutex_lock(&chip->lock);
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}
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static void sx150x_irq_bus_sync_unlock(struct irq_data *d)
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{
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struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
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unsigned n;
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if (chip->irq_update == NO_UPDATE_PENDING)
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goto out;
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n = chip->irq_update;
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chip->irq_update = NO_UPDATE_PENDING;
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/* Avoid updates if nothing changed */
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if (chip->dev_sense == chip->irq_sense &&
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chip->dev_sense == chip->irq_masked)
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goto out;
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chip->dev_sense = chip->irq_sense;
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chip->dev_masked = chip->irq_masked;
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if (chip->irq_masked & (1 << n)) {
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sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 1);
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sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense, 0);
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} else {
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sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 0);
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sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense,
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chip->irq_sense >> (n * 2));
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}
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out:
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mutex_unlock(&chip->lock);
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}
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static void sx150x_init_chip(struct sx150x_chip *chip,
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struct i2c_client *client,
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kernel_ulong_t driver_data,
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struct sx150x_platform_data *pdata)
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{
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mutex_init(&chip->lock);
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chip->client = client;
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chip->dev_cfg = &sx150x_devices[driver_data];
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chip->gpio_chip.label = client->name;
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chip->gpio_chip.direction_input = sx150x_gpio_direction_input;
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chip->gpio_chip.direction_output = sx150x_gpio_direction_output;
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chip->gpio_chip.get = sx150x_gpio_get;
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chip->gpio_chip.set = sx150x_gpio_set;
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chip->gpio_chip.to_irq = sx150x_gpio_to_irq;
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chip->gpio_chip.base = pdata->gpio_base;
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chip->gpio_chip.can_sleep = 1;
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chip->gpio_chip.ngpio = chip->dev_cfg->ngpios;
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if (pdata->oscio_is_gpo)
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++chip->gpio_chip.ngpio;
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chip->irq_chip.name = client->name;
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chip->irq_chip.irq_mask = sx150x_irq_mask;
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chip->irq_chip.irq_unmask = sx150x_irq_unmask;
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chip->irq_chip.irq_set_type = sx150x_irq_set_type;
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chip->irq_chip.irq_bus_lock = sx150x_irq_bus_lock;
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chip->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock;
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chip->irq_summary = -1;
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chip->irq_base = -1;
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chip->irq_masked = ~0;
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chip->irq_sense = 0;
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chip->dev_masked = ~0;
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chip->dev_sense = 0;
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chip->irq_update = NO_UPDATE_PENDING;
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}
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static int sx150x_init_io(struct sx150x_chip *chip, u8 base, u16 cfg)
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{
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int err = 0;
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unsigned n;
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for (n = 0; err >= 0 && n < (chip->dev_cfg->ngpios / 8); ++n)
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err = sx150x_i2c_write(chip->client, base - n, cfg >> (n * 8));
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return err;
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}
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static int sx150x_reset(struct sx150x_chip *chip)
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{
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int err;
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err = i2c_smbus_write_byte_data(chip->client,
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chip->dev_cfg->reg_reset,
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0x12);
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if (err < 0)
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return err;
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err = i2c_smbus_write_byte_data(chip->client,
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chip->dev_cfg->reg_reset,
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0x34);
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return err;
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}
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static int sx150x_init_hw(struct sx150x_chip *chip,
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struct sx150x_platform_data *pdata)
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{
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int err = 0;
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if (pdata->reset_during_probe) {
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err = sx150x_reset(chip);
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if (err < 0)
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return err;
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}
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err = sx150x_i2c_write(chip->client,
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chip->dev_cfg->reg_misc,
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0x01);
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if (err < 0)
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return err;
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err = sx150x_init_io(chip, chip->dev_cfg->reg_pullup,
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pdata->io_pullup_ena);
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if (err < 0)
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return err;
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|
|
err = sx150x_init_io(chip, chip->dev_cfg->reg_pulldn,
|
|
pdata->io_pulldn_ena);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = sx150x_init_io(chip, chip->dev_cfg->reg_drain,
|
|
pdata->io_open_drain_ena);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = sx150x_init_io(chip, chip->dev_cfg->reg_polarity,
|
|
pdata->io_polarity);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
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;
|
|
unsigned n;
|
|
unsigned irq;
|
|
|
|
chip->irq_summary = irq_summary;
|
|
chip->irq_base = irq_base;
|
|
|
|
for (n = 0; n < chip->dev_cfg->ngpios; ++n) {
|
|
irq = irq_base + n;
|
|
irq_set_chip_data(irq, chip);
|
|
irq_set_chip_and_handler(irq, &chip->irq_chip, handle_edge_irq);
|
|
irq_set_nested_thread(irq, 1);
|
|
#ifdef CONFIG_ARM
|
|
set_irq_flags(irq, IRQF_VALID);
|
|
#else
|
|
irq_set_noprobe(irq);
|
|
#endif
|
|
}
|
|
|
|
err = request_threaded_irq(irq_summary,
|
|
NULL,
|
|
sx150x_irq_thread_fn,
|
|
IRQF_SHARED | IRQF_TRIGGER_FALLING,
|
|
chip->irq_chip.name,
|
|
chip);
|
|
if (err < 0) {
|
|
chip->irq_summary = -1;
|
|
chip->irq_base = -1;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void sx150x_remove_irq_chip(struct sx150x_chip *chip)
|
|
{
|
|
unsigned n;
|
|
unsigned irq;
|
|
|
|
free_irq(chip->irq_summary, chip);
|
|
|
|
for (n = 0; n < chip->dev_cfg->ngpios; ++n) {
|
|
irq = chip->irq_base + n;
|
|
irq_set_chip_and_handler(irq, NULL, NULL);
|
|
}
|
|
}
|
|
|
|
static int sx150x_probe(struct i2c_client *client,
|
|
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;
|
|
|
|
pdata = client->dev.platform_data;
|
|
if (!pdata)
|
|
return -EINVAL;
|
|
|
|
if (!i2c_check_functionality(client->adapter, i2c_funcs))
|
|
return -ENOSYS;
|
|
|
|
chip = kzalloc(sizeof(struct sx150x_chip), GFP_KERNEL);
|
|
if (!chip)
|
|
return -ENOMEM;
|
|
|
|
sx150x_init_chip(chip, client, id->driver_data, pdata);
|
|
rc = sx150x_init_hw(chip, pdata);
|
|
if (rc < 0)
|
|
goto probe_fail_pre_gpiochip_add;
|
|
|
|
rc = gpiochip_add(&chip->gpio_chip);
|
|
if (rc < 0)
|
|
goto probe_fail_pre_gpiochip_add;
|
|
|
|
if (pdata->irq_summary >= 0) {
|
|
rc = sx150x_install_irq_chip(chip,
|
|
pdata->irq_summary,
|
|
pdata->irq_base);
|
|
if (rc < 0)
|
|
goto probe_fail_post_gpiochip_add;
|
|
}
|
|
|
|
i2c_set_clientdata(client, chip);
|
|
|
|
return 0;
|
|
probe_fail_post_gpiochip_add:
|
|
WARN_ON(gpiochip_remove(&chip->gpio_chip) < 0);
|
|
probe_fail_pre_gpiochip_add:
|
|
kfree(chip);
|
|
return rc;
|
|
}
|
|
|
|
static int sx150x_remove(struct i2c_client *client)
|
|
{
|
|
struct sx150x_chip *chip;
|
|
int rc;
|
|
|
|
chip = i2c_get_clientdata(client);
|
|
rc = gpiochip_remove(&chip->gpio_chip);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
if (chip->irq_summary >= 0)
|
|
sx150x_remove_irq_chip(chip);
|
|
|
|
kfree(chip);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct i2c_driver sx150x_driver = {
|
|
.driver = {
|
|
.name = "sx150x",
|
|
.owner = THIS_MODULE
|
|
},
|
|
.probe = sx150x_probe,
|
|
.remove = sx150x_remove,
|
|
.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");
|
|
MODULE_ALIAS("i2c:sx150x");
|