/*
* Copyright (c) 2008-2009 Rodolfo Giometti <giometti@linux.it>
* Copyright (c) 2008-2009 Eurotech S.p.A. <info@eurotech.it>
* Copyright (c) 2019 <support@ragile.com>
*
* I2C multiplexer
*
* This module supports the PCA954x series of I2C multiplexer/switch chips
* made by Philips Semiconductors.
* This includes the:
* PCA9540, PCA9542, PCA9543, PCA9544, PCA9545, PCA9546, PCA9547
* and PCA9548.
*
* These chips are all controlled via the I2C bus itself, and all have a
* single 8-bit register. The upstream "parent" bus fans out to two,
* four, or eight downstream busses or channels; which of these
* are selected is determined by the chip type and register contents. A
* mux can select only one sub-bus at a time; a switch can select any
* combination simultaneously.
*
* Based on:
* pca954x.c from Kumar Gala <galak@kernel.crashing.org>
* Copyright (C) 2006
*
* Based on:
* pca954x.c from Ken Harrenstien
* Copyright (C) 2004 Google, Inc. (Ken Harrenstien)
*
* Based on:
* i2c-virtual_cb.c from Brian Kuschak <bkuschak@yahoo.com>
* and
* pca9540.c from Jean Delvare <jdelvare@suse.de>.
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/i2c-mux.h>
#include <linux/platform_data/pca954x.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/i2c-smbus.h>
#include <linux/fs.h>
#define PCA954X_MAX_NCHANS 8
#define PCA954X_IRQ_OFFSET 4
extern int pca9641_setmuxflag(int nr, int flag);
int force_create_bus = 0;
module_param(force_create_bus, int, S_IRUGO | S_IWUSR);
enum pca_type {
pca_9540,
pca_9542,
pca_9543,
pca_9544,
pca_9545,
pca_9546,
pca_9547,
pca_9548,
};
struct chip_desc {
u8 nchans;
u8 enable; /* used for muxes only */
u8 has_irq;
enum muxtype {
pca954x_ismux = 0,
pca954x_isswi
} muxtype;
};
struct pca954x {
const struct chip_desc *chip;
u8 last_chan; /* last register value */
u8 deselect;
struct i2c_client *client;
struct irq_domain *irq;
unsigned int irq_mask;
raw_spinlock_t lock;
};
/* Provide specs for the PCA954x types we know about */
static const struct chip_desc chips[] = {
[pca_9540] = {
.nchans = 2,
.enable = 0x4,
.muxtype = pca954x_ismux,
},
[pca_9542] = {
.nchans = 2,
.enable = 0x4,
.has_irq = 1,
.muxtype = pca954x_ismux,
},
[pca_9543] = {
.nchans = 2,
.has_irq = 1,
.muxtype = pca954x_isswi,
},
[pca_9544] = {
.nchans = 4,
.enable = 0x4,
.has_irq = 1,
.muxtype = pca954x_ismux,
},
[pca_9545] = {
.nchans = 4,
.has_irq = 1,
.muxtype = pca954x_isswi,
},
[pca_9546] = {
.nchans = 4,
.muxtype = pca954x_isswi,
},
[pca_9547] = {
.nchans = 8,
.enable = 0x8,
.muxtype = pca954x_ismux,
},
[pca_9548] = {
.nchans = 8,
.muxtype = pca954x_isswi,
},
};
static const struct i2c_device_id pca954x_id[] = {
{ "pca9540", pca_9540 },
{ "pca9542", pca_9542 },
{ "pca9543", pca_9543 },
{ "pca9544", pca_9544 },
{ "pca9545", pca_9545 },
{ "pca9546", pca_9546 },
{ "pca9547", pca_9547 },
{ "pca9548", pca_9548 },
{ }
};
MODULE_DEVICE_TABLE(i2c, pca954x_id);
#ifdef CONFIG_OF
static const struct of_device_id pca954x_of_match[] = {
{ .compatible = "nxp,pca9540", .data = &chips[pca_9540] },
{ .compatible = "nxp,pca9542", .data = &chips[pca_9542] },
{ .compatible = "nxp,pca9543", .data = &chips[pca_9543] },
{ .compatible = "nxp,pca9544", .data = &chips[pca_9544] },
{ .compatible = "nxp,pca9545", .data = &chips[pca_9545] },
{ .compatible = "nxp,pca9546", .data = &chips[pca_9546] },
{ .compatible = "nxp,pca9547", .data = &chips[pca_9547] },
{ .compatible = "nxp,pca9548", .data = &chips[pca_9548] },
{}
};
MODULE_DEVICE_TABLE(of, pca954x_of_match);
#endif
/* Write to mux register. Don't use i2c_transfer()/i2c_smbus_xfer()
for this as they will try to lock adapter a second time */
static int pca954x_reg_write(struct i2c_adapter *adap,
struct i2c_client *client, u8 val)
{
int ret = -ENODEV;
if (adap->algo->master_xfer) {
struct i2c_msg msg;
char buf[1];
msg.addr = client->addr;
msg.flags = 0;
msg.len = 1;
buf[0] = val;
msg.buf = buf;
ret = __i2c_transfer(adap, &msg, 1);
if (ret >= 0 && ret != 1)
ret = -EREMOTEIO;
} else {
union i2c_smbus_data data;
ret = adap->algo->smbus_xfer(adap, client->addr,
client->flags,
I2C_SMBUS_WRITE,
val, I2C_SMBUS_BYTE, &data);
}
return ret;
}
static int pca954x_setmuxflag(struct i2c_client *client, int flag)
{
struct i2c_adapter *adap = to_i2c_adapter(client->dev.parent);
pca9641_setmuxflag(adap->nr, flag);
return 0;
}
static int pca954x_select_chan(struct i2c_mux_core *muxc, u32 chan)
{
struct pca954x *data = i2c_mux_priv(muxc);
struct i2c_client *client = data->client;
const struct chip_desc *chip = data->chip;
u8 regval;
int ret = 0;
/* we make switches look like muxes, not sure how to be smarter */
if (chip->muxtype == pca954x_ismux)
regval = chan | chip->enable;
else
regval = 1 << chan;
/* Only select the channel if its different from the last channel */
if (data->last_chan != regval) {
pca954x_setmuxflag(client, 0);
ret = pca954x_reg_write(muxc->parent, client, regval);
data->last_chan = ret < 0 ? 0 : regval;
}
return ret;
}
typedef void (*pca954x_hw_do_reset_func_t)(int busid, int addr);
pca954x_hw_do_reset_func_t g_notify_to_do_reset = NULL;
void pca954x_hw_do_reset_func_register(void* func)
{
if (func == NULL) {
return ;
}
g_notify_to_do_reset = func;
return;
}
EXPORT_SYMBOL(pca954x_hw_do_reset_func_register);
static int pca954x_hw_do_reset(int busid, int addr)
{
if (g_notify_to_do_reset != NULL) {
(*g_notify_to_do_reset)(busid, addr);
return 0;
}
return 0;
}
/***************************************9548 reset*****************************************/
#define DEV_TYPE 0x404a
#define PCA9548_MAX_CPLD_NUM (32) /* PCA9548 max number */
#define PCA9548_MAX_CPLD_LAYER (8) /* PCA9548 max layer */
#define DFD_PID_BUF_LEN (32)
#define DFD_PRODUCT_ID_LENGTH (8)
#define CPLD_PCA9548_RESET 0x023500b0 /* bus:2, addr:0x35, offset:0xb0 */
#define B6510_32CQ_CPLD_PCA9548_RESET 0x060d0060 /* bus:6, addr:0x0d, offset:0x60 */
#define DFD_PUB_CARDTYPE_FILE "/sys/module/ragile_common/parameters/dfd_my_type"
#define DFD_MAX_PRODUCT_NUM (32)
#define I2C_RETRY_TIMES 5
#define I2C_RETRY_WAIT_TIMES 10 /*delay 10ms*/
#define PCA9548_I2C_GET_BUS(addr) (((addr) >> 24) & 0x00ff)
#define PCA9548_I2C_GET_CLIENT(addr) (((addr) >> 16) & 0x00ff)
#define PCA9548_I2C_GET_OFFSET(addr) (addr & 0xffff)
typedef enum pca9548_reset_type {
PCA9548_RESET_FUNC = 0,
PCA9548_RESET_GPIO = 1,
} pca9548_reset_type_t;
typedef void (*pca954x_hw_do_reset_func_t_new)(int io_port, u8 value);
typedef u8 (*pca954x_get_umask_func_t)(int io_port);
void pca954x_hw_do_reset_by_i2c(int addr, u8 value);
u8 pca954x_get_umask_by_i2c(int addr);
void pca954x_hw_do_reset_by_lpc(int io_port, u8 value);
u8 pca954x_get_umask_by_lpc(int io_port);
typedef struct func_attr_s {
int cfg_offset[PCA9548_MAX_CPLD_LAYER];
int umask[PCA9548_MAX_CPLD_LAYER];
pca954x_hw_do_reset_func_t_new reset_func; /* 9548 reset function */
pca954x_get_umask_func_t get_umask_func; /* get reset mask */
} func_attr_t;
typedef struct gpio_attr_s {
int gpio;
int gpio_init;
u8 reset_on;
u8 reset_off;
} gpio_attr_t;
typedef struct pca9548_cfg_info_s {
int pca9548_reset_type;
int pca9548_bus;
int pca9548_addr;
int rst_delay_b; /* delay time before reset(us) */
int rst_delay; /* reset time(us) */
int rst_delay_a; /* delay time after reset(us) */
union {
func_attr_t func_attr;
gpio_attr_t gpio_attr;
} attr;
} pca9548_cfg_info_t;
typedef struct fpga_pcie_card_info_s {
int dev_type[DFD_MAX_PRODUCT_NUM]; /* dev type */
pca9548_cfg_info_t pca9548_cfg_info[PCA9548_MAX_CPLD_NUM];
} pca9548_card_info_t;
static pca9548_card_info_t g_pca9548_card_info[] = {
{
.dev_type = {0x404a}, /* RA-B6510-48V8C */
.pca9548_cfg_info = {
/* psu fan */
{
.pca9548_reset_type = PCA9548_RESET_GPIO,
.pca9548_bus = 2,
.pca9548_addr = 0x70,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.gpio_attr.gpio = 7,
.gpio_attr.gpio_init = 0,
.gpio_attr.reset_on = 1,
.gpio_attr.reset_off = 0,
},
},
/* sff1 */
{
.pca9548_reset_type = PCA9548_RESET_FUNC,
.pca9548_bus = 1,
.pca9548_addr = 0x70,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.func_attr.reset_func = pca954x_hw_do_reset_by_i2c,
.func_attr.get_umask_func = pca954x_get_umask_by_i2c,
.func_attr.cfg_offset = {CPLD_PCA9548_RESET, -1},
.func_attr.umask = {BIT(0), -1},
},
},
/* sff2 */
{
.pca9548_reset_type = PCA9548_RESET_FUNC,
.pca9548_bus = 1,
.pca9548_addr = 0x71,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.func_attr.reset_func = pca954x_hw_do_reset_by_i2c,
.func_attr.get_umask_func = pca954x_get_umask_by_i2c,
.func_attr.cfg_offset = {CPLD_PCA9548_RESET, -1},
.func_attr.umask = {BIT(1), -1},
},
},
/* sff3 */
{
.pca9548_reset_type = PCA9548_RESET_FUNC,
.pca9548_bus = 1,
.pca9548_addr = 0x72,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.func_attr.reset_func = pca954x_hw_do_reset_by_i2c,
.func_attr.get_umask_func = pca954x_get_umask_by_i2c,
.func_attr.cfg_offset = {CPLD_PCA9548_RESET, -1},
.func_attr.umask = {BIT(2), -1},
},
},
/* sff4 */
{
.pca9548_reset_type = PCA9548_RESET_FUNC,
.pca9548_bus = 1,
.pca9548_addr = 0x73,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.func_attr.reset_func = pca954x_hw_do_reset_by_i2c,
.func_attr.get_umask_func = pca954x_get_umask_by_i2c,
.func_attr.cfg_offset = {CPLD_PCA9548_RESET, -1},
.func_attr.umask = {BIT(3), -1},
},
},
/* sff5 */
{
.pca9548_reset_type = PCA9548_RESET_FUNC,
.pca9548_bus = 1,
.pca9548_addr = 0x74,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.func_attr.reset_func = pca954x_hw_do_reset_by_i2c,
.func_attr.get_umask_func = pca954x_get_umask_by_i2c,
.func_attr.cfg_offset = {CPLD_PCA9548_RESET, -1},
.func_attr.umask = {BIT(4), -1},
},
},
/* sff6 */
{
.pca9548_reset_type = PCA9548_RESET_FUNC,
.pca9548_bus = 1,
.pca9548_addr = 0x75,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.func_attr.reset_func = pca954x_hw_do_reset_by_i2c,
.func_attr.get_umask_func = pca954x_get_umask_by_i2c,
.func_attr.cfg_offset = {CPLD_PCA9548_RESET, -1},
.func_attr.umask = {BIT(5), -1},
},
},
/* sff7 */
{
.pca9548_reset_type = PCA9548_RESET_FUNC,
.pca9548_bus = 1,
.pca9548_addr = 0x76,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.func_attr.reset_func = pca954x_hw_do_reset_by_i2c,
.func_attr.get_umask_func = pca954x_get_umask_by_i2c,
.func_attr.cfg_offset = {CPLD_PCA9548_RESET, -1},
.func_attr.umask = {BIT(6), -1},
},
},
},
},
{
/*RA-B6910-64C*/
.dev_type = {0x404c},
.pca9548_cfg_info = {
/* psu fan */
{
.pca9548_reset_type = PCA9548_RESET_GPIO,
.pca9548_bus = 2,
.pca9548_addr = 0x70,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.gpio_attr.gpio = 7,
.gpio_attr.gpio_init = 0,
.gpio_attr.reset_on = 1,
.gpio_attr.reset_off = 0,
},
},
/* sff1 */
{
.pca9548_reset_type = PCA9548_RESET_FUNC,
.pca9548_bus = 1,
.pca9548_addr = 0x70,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.func_attr.reset_func = pca954x_hw_do_reset_by_i2c,
.func_attr.get_umask_func = pca954x_get_umask_by_i2c,
.func_attr.cfg_offset = {CPLD_PCA9548_RESET, -1},
.func_attr.umask = {BIT(0), -1},
},
},
/* sff2 */
{
.pca9548_reset_type = PCA9548_RESET_FUNC,
.pca9548_bus = 1,
.pca9548_addr = 0x71,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.func_attr.reset_func = pca954x_hw_do_reset_by_i2c,
.func_attr.get_umask_func = pca954x_get_umask_by_i2c,
.func_attr.cfg_offset = {CPLD_PCA9548_RESET, -1},
.func_attr.umask = {BIT(1), -1},
},
},
/* sff3 */
{
.pca9548_reset_type = PCA9548_RESET_FUNC,
.pca9548_bus = 1,
.pca9548_addr = 0x72,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.func_attr.reset_func = pca954x_hw_do_reset_by_i2c,
.func_attr.get_umask_func = pca954x_get_umask_by_i2c,
.func_attr.cfg_offset = {CPLD_PCA9548_RESET, -1},
.func_attr.umask = {BIT(2), -1},
},
},
/* sff4 */
{
.pca9548_reset_type = PCA9548_RESET_FUNC,
.pca9548_bus = 1,
.pca9548_addr = 0x73,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.func_attr.reset_func = pca954x_hw_do_reset_by_i2c,
.func_attr.get_umask_func = pca954x_get_umask_by_i2c,
.func_attr.cfg_offset = {CPLD_PCA9548_RESET, -1},
.func_attr.umask = {BIT(3), -1},
},
},
/* sff5 */
{
.pca9548_reset_type = PCA9548_RESET_FUNC,
.pca9548_bus = 1,
.pca9548_addr = 0x74,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.func_attr.reset_func = pca954x_hw_do_reset_by_i2c,
.func_attr.get_umask_func = pca954x_get_umask_by_i2c,
.func_attr.cfg_offset = {CPLD_PCA9548_RESET, -1},
.func_attr.umask = {BIT(4), -1},
},
},
/* sff6 */
{
.pca9548_reset_type = PCA9548_RESET_FUNC,
.pca9548_bus = 1,
.pca9548_addr = 0x75,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.func_attr.reset_func = pca954x_hw_do_reset_by_i2c,
.func_attr.get_umask_func = pca954x_get_umask_by_i2c,
.func_attr.cfg_offset = {CPLD_PCA9548_RESET, -1},
.func_attr.umask = {BIT(5), -1},
},
},
/* sff7 */
{
.pca9548_reset_type = PCA9548_RESET_FUNC,
.pca9548_bus = 1,
.pca9548_addr = 0x76,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.func_attr.reset_func = pca954x_hw_do_reset_by_i2c,
.func_attr.get_umask_func = pca954x_get_umask_by_i2c,
.func_attr.cfg_offset = {CPLD_PCA9548_RESET, -1},
.func_attr.umask = {BIT(6), -1},
},
},
/* sff8 */
{
.pca9548_reset_type = PCA9548_RESET_FUNC,
.pca9548_bus = 1,
.pca9548_addr = 0x77,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.func_attr.reset_func = pca954x_hw_do_reset_by_i2c,
.func_attr.get_umask_func = pca954x_get_umask_by_i2c,
.func_attr.cfg_offset = {CPLD_PCA9548_RESET, -1},
.func_attr.umask = {BIT(7), -1},
},
},
},
},
{
/* RA-B6510-32C */
.dev_type = {0x404b},
.pca9548_cfg_info = {
/* psu */
{
.pca9548_reset_type = PCA9548_RESET_FUNC,
.pca9548_bus = 4,
.pca9548_addr = 0x77,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.func_attr.reset_func = pca954x_hw_do_reset_by_lpc,
.func_attr.get_umask_func = pca954x_get_umask_by_lpc,
.func_attr.cfg_offset = {0x960, -1},
.func_attr.umask = {BIT(0), -1},
},
},
/* fan */
{
.pca9548_reset_type = PCA9548_RESET_FUNC,
.pca9548_bus = 2,
.pca9548_addr = 0x77,
.rst_delay_b = 0,
.rst_delay = 1000,
.rst_delay_a = 1000,
.attr = {
.func_attr.reset_func = pca954x_hw_do_reset_by_lpc,
.func_attr.get_umask_func = pca954x_get_umask_by_lpc,
.func_attr.cfg_offset = {0x960, -1},
.func_attr.umask = {BIT(1), -1},
},
},
},
},
};
int g_pca954x_debug = 0;
module_param(g_pca954x_debug, int, S_IRUGO | S_IWUSR);
#define PCA954X_DEBUG(fmt, args...) do { \
if (g_pca954x_debug) { \
printk(KERN_ERR "[PCA95x][VER][func:%s line:%d]\r\n"fmt, __func__, __LINE__, ## args); \
} \
} while (0)
static int dfd_get_my_dev_type_by_file(void)
{
struct file *fp;
/* mm_segment_t fs;*/
loff_t pos;
static int card_type;
char buf[DFD_PID_BUF_LEN];
if (card_type != 0) {
return card_type;
}
fp= filp_open(DFD_PUB_CARDTYPE_FILE, O_RDONLY, 0);
if (IS_ERR(fp)) {
PCA954X_DEBUG("open file fail!\r\n");
return -1;
}
/* fs = get_fs(); */
/* set_fs(KERNEL_DS); */
memset(buf, 0, DFD_PID_BUF_LEN);
pos = 0;
kernel_read(fp, buf, DFD_PRODUCT_ID_LENGTH + 1, &pos);
// kernel_read(fp, pos, buf, DFD_PRODUCT_ID_LENGTH + 1 );
if (pos < 0) {
PCA954X_DEBUG("read file fail!\r\n");
goto exit;
}
card_type = simple_strtoul(buf, NULL, 10);
PCA954X_DEBUG("card_type 0x%x.\n", card_type);
exit:
/* set_fs(fs); */
filp_close(fp, NULL);
return card_type;
}
static int drv_get_my_dev_type(void)
{
static int type = -1;
if (type > 0) {
return type;
}
type = dfd_get_my_dev_type_by_file();
PCA954X_DEBUG("ko board type %d\r\n", type);
return type;
}
pca9548_card_info_t* pca9548_get_card_info(int dev_type)
{
int i, j;
int size;
size = ARRAY_SIZE(g_pca9548_card_info);
PCA954X_DEBUG("Enter dev_type 0x%x size %d.\n", dev_type, size);
for (i = 0; i < size; i++) {
for(j = 0; j < DFD_MAX_PRODUCT_NUM; j++) {
if (g_pca9548_card_info[i].dev_type[j] == dev_type) {
PCA954X_DEBUG("match dev_type 0x%x.\n", dev_type);
return &g_pca9548_card_info[i];
}
}
}
PCA954X_DEBUG("dismatch dev_type 0x%x.\n", dev_type);
return NULL;
}
pca9548_cfg_info_t* get_pca9548_cfg_info(int bus, int addr)
{
int dev_type;
pca9548_card_info_t *info;
pca9548_cfg_info_t *pca9548_cfg_info;
int i;
int size;
dev_type = drv_get_my_dev_type();
if (dev_type < 0) {
PCA954X_DEBUG("drv_get_my_dev_type failed ret %d.\n", dev_type);
return NULL;
}
info = pca9548_get_card_info(dev_type);
if (info == NULL) {
PCA954X_DEBUG("fpga_pcie_get_card_info dev_type %d failed.\n", dev_type);
return NULL;
}
size = PCA9548_MAX_CPLD_NUM;
for (i = 0; i < size; i++) {
pca9548_cfg_info = &(info->pca9548_cfg_info[i]);
if ((pca9548_cfg_info->pca9548_bus == bus) && (pca9548_cfg_info->pca9548_addr == addr)) {
PCA954X_DEBUG("match dev_type 0x%x bus %d addr 0x%x.\n", dev_type, bus, addr);
return pca9548_cfg_info;
}
}
PCA954X_DEBUG("dismatch dev_type 0x%x bus %d addr 0x%x.\n", dev_type, bus, addr);
return NULL;
}
static void pca9548_gpio_init(gpio_attr_t *gpio_attr)
{
if (gpio_attr->gpio_init == 0) {
PCA954X_DEBUG("gpio%d init.\n", gpio_attr->gpio);
gpio_request(gpio_attr->gpio, "pca9548_reset");
gpio_direction_output(gpio_attr->gpio, gpio_attr->reset_off);
gpio_attr->gpio_init = 1;
}
}
static void pca9548_gpio_free(gpio_attr_t *gpio_attr)
{
if (gpio_attr == NULL) {
PCA954X_DEBUG("pca9548_gpio_free,params error\n");
return ;
}
if (gpio_attr->gpio_init == 1) {
PCA954X_DEBUG("gpio%d release.\n", gpio_attr->gpio);
gpio_free(gpio_attr->gpio);
gpio_attr->gpio_init = 0;
}
}
static int pca954x_do_gpio_reset(pca9548_cfg_info_t *cfg_info, struct i2c_adapter *adap,
struct i2c_client *client, u32 chan)
{
struct i2c_mux_core *muxc = i2c_get_clientdata(client);
struct pca954x *data = i2c_mux_priv(muxc);
int ret = -1;
gpio_attr_t *tmp_gpio_attr;
int timeout;
int val;
struct i2c_adapter *adapter;
int adapter_timeout;
if (cfg_info == NULL) {
PCA954X_DEBUG("pca9548 cfg info is null.\n");
return ret;
}
if (cfg_info->pca9548_reset_type == PCA9548_RESET_GPIO) {
tmp_gpio_attr = &(cfg_info->attr.gpio_attr);
timeout = cfg_info->rst_delay_a;
pca9548_gpio_init(tmp_gpio_attr);
udelay(cfg_info->rst_delay_b);
/* reset on */
PCA954X_DEBUG("set gpio%d %d.\n", tmp_gpio_attr->gpio, tmp_gpio_attr->reset_on);
__gpio_set_value(tmp_gpio_attr->gpio, tmp_gpio_attr->reset_on);
udelay(cfg_info->rst_delay);
/* reset off */
PCA954X_DEBUG("set gpio%d %d.\n", tmp_gpio_attr->gpio, tmp_gpio_attr->reset_off);
__gpio_set_value(tmp_gpio_attr->gpio, tmp_gpio_attr->reset_off);
while (timeout > 0) {
udelay(1);
val = __gpio_get_value(tmp_gpio_attr->gpio);
if (val == tmp_gpio_attr->reset_off) {
adapter = adap;
/* get bus info */
while(i2c_parent_is_i2c_adapter(adapter)){
adapter = to_i2c_adapter(adapter->dev.parent);
}
adapter_timeout = adapter->timeout;
adapter->timeout = msecs_to_jiffies(50);
pca954x_reg_write(adap, client, data->last_chan);
adapter->timeout = adapter_timeout;
ret = 0;
PCA954X_DEBUG("pca954x_do_gpio_reset success.\n");
break;
}
if (timeout >= 1000 && (timeout % 1000 == 0)) {
/* 1MS schedule*/
schedule();
}
timeout--;
}
if (ret) {
PCA954X_DEBUG("pca954x_do_gpio_reset failed.\n");
}
pca9548_gpio_free(&(cfg_info->attr.gpio_attr));
} else {
PCA954X_DEBUG("pca9548_reset_type invalid, pca954x_do_gpio_reset failed.\n");
}
return ret;
}
static int pca954x_do_func_reset(pca9548_cfg_info_t *cfg_info, struct i2c_adapter *adap,
struct i2c_client *client, u32 chan)
{
struct i2c_mux_core *muxc = i2c_get_clientdata(client);
struct pca954x *data = i2c_mux_priv(muxc);
int ret = -1;
func_attr_t *tmp_func_attr;
int timeout;
int val;
struct i2c_adapter *adapter;
int adapter_timeout;
int i;
u8 old_value;
if (cfg_info == NULL) {
PCA954X_DEBUG("pca9548 cfg info is null.\n");
return ret;
}
if (cfg_info->pca9548_reset_type == PCA9548_RESET_FUNC) {
tmp_func_attr = &(cfg_info->attr.func_attr);
timeout = cfg_info->rst_delay_a;
if ((tmp_func_attr->reset_func == NULL) || (tmp_func_attr->get_umask_func == NULL)) {
PCA954X_DEBUG("pca954x hw do reset func or get umask func is null.\n");
return ret;
}
for(i = 0; (i < PCA9548_MAX_CPLD_LAYER) && (tmp_func_attr->cfg_offset[i] != -1)
&& (tmp_func_attr->umask[i] != -1); i++) {
old_value = (*tmp_func_attr->get_umask_func)(tmp_func_attr->cfg_offset[i]);
PCA954X_DEBUG("cfg info: offset:0x%x umask:0x%x, old_value:0x%x\n",
tmp_func_attr->cfg_offset[i], tmp_func_attr->umask[i],old_value);
(*tmp_func_attr->reset_func)(tmp_func_attr->cfg_offset[i], old_value & ~tmp_func_attr->umask[i]);
udelay(cfg_info->rst_delay);
(*tmp_func_attr->reset_func)(tmp_func_attr->cfg_offset[i], old_value | tmp_func_attr->umask[i]);
}
while (timeout > 0) {
udelay(1);
val = (*tmp_func_attr->get_umask_func)(tmp_func_attr->cfg_offset[i - 1]);
val &= (tmp_func_attr->umask[i - 1]);
if (val == tmp_func_attr->umask[i - 1]) {
adapter = adap;
/* get bus info */
while(i2c_parent_is_i2c_adapter(adapter)){
adapter = to_i2c_adapter(adapter->dev.parent);
}
adapter_timeout = adapter->timeout;
adapter->timeout = msecs_to_jiffies(50);
pca954x_reg_write(adap, client, data->last_chan);
adapter->timeout = adapter_timeout;
ret = 0;
PCA954X_DEBUG("pca954x_do_func_reset success.\n");
break;
}
if (timeout >= 1000 && (timeout % 1000 == 0)) {
/* 1MS schedule*/
schedule();
}
timeout--;
}
if (ret) {
PCA954X_DEBUG("pca954x_do_func_reset failed.\n");
}
} else {
PCA954X_DEBUG("pca9548_reset_type invalid, pca954x_do_func_reset failed.\n");
}
return ret;
}
static int pca9548_reset_ctrl(pca9548_cfg_info_t *cfg_info, struct i2c_adapter *adap,
struct i2c_client *client, u32 chan)
{
int ret = -1;
if (cfg_info == NULL) {
PCA954X_DEBUG("pca9548 cfg info is null.\n");
return ret;
}
if (cfg_info->pca9548_reset_type == PCA9548_RESET_FUNC) {
ret = pca954x_do_func_reset(cfg_info, adap, client, chan);
} else if (cfg_info->pca9548_reset_type == PCA9548_RESET_GPIO) {
ret = pca954x_do_gpio_reset(cfg_info, adap, client, chan);
}
if (ret < 0) {
PCA954X_DEBUG("pca9548_reset_ctrl failed.\n");
}
return ret;
}
static int pca954x_reset_i2c_read(uint32_t bus, uint32_t addr, uint32_t offset_addr,
unsigned char *buf, uint32_t size)
{
struct file *fp;
/* mm_segment_t fs; */
struct i2c_client client;
char i2c_path[32];
int i ,j ;
int rv;
rv = 0;
memset(i2c_path, 0, 32);
snprintf(i2c_path, sizeof(i2c_path), "/dev/i2c-%d", bus);
fp = filp_open(i2c_path, O_RDWR, S_IRUSR | S_IWUSR);
if (IS_ERR(fp)) {
PCA954X_DEBUG("i2c open fail.\n");
return -1;
}
memcpy(&client, fp->private_data, sizeof(struct i2c_client));
client.addr = addr;
/* fs = get_fs(); */
/* set_fs(KERNEL_DS); */
for (j = 0 ;j < size ;j++){
for (i = 0; i < I2C_RETRY_TIMES; i++) {
rv = i2c_smbus_read_byte_data(&client, (offset_addr + j));
if (rv < 0) {
PCA954X_DEBUG("i2c read failed, try again.\n");
msleep(I2C_RETRY_WAIT_TIMES);
if (i >= (I2C_RETRY_TIMES - 1)) {
goto out;
}
continue;
}
*(buf + j) = (unsigned char)rv;
break;
}
}
out:
filp_close(fp, NULL);
/* set_fs(fs); */
return rv;
}
static int pca954x_reset_i2c_write(uint32_t bus, uint32_t dev_addr, uint32_t offset_addr,
uint8_t write_buf)
{
struct file *fp;
/* mm_segment_t fs; */
struct i2c_client client;
char i2c_path[32];
int i;
int rv;
rv = 0;
memset(i2c_path, 0, 32);
snprintf(i2c_path, sizeof(i2c_path), "/dev/i2c-%d", bus);
fp = filp_open(i2c_path, O_RDWR, S_IRUSR | S_IWUSR);
if (IS_ERR(fp)) {
PCA954X_DEBUG("i2c open fail.\n");
return -1;
}
memcpy(&client, fp->private_data, sizeof(struct i2c_client));
client.addr = dev_addr;
/* fs = get_fs(); */
/* set_fs(KERNEL_DS); */
for (i = 0; i < I2C_RETRY_TIMES; i++) {
rv = i2c_smbus_write_byte_data(&client, offset_addr, write_buf);
if (rv < 0) {
PCA954X_DEBUG("i2c write failed, try again.\n");
msleep(I2C_RETRY_WAIT_TIMES);
if (i >= (I2C_RETRY_TIMES - 1)) {
goto out;
}
continue;
}
break;
}
out:
filp_close(fp, NULL);
/* set_fs(fs); */
return rv;
}
int pca954x_reset_reg_i2c_read_byte(int addr, u8 *value)
{
int bus;
int client_addr;
int offset;
int ret;
bus = PCA9548_I2C_GET_BUS(addr);
client_addr = PCA9548_I2C_GET_CLIENT(addr);
offset = PCA9548_I2C_GET_OFFSET(addr);
ret = pca954x_reset_i2c_read(bus, client_addr, offset, value, 1);
if (ret < 0) {
PCA954X_DEBUG(" 0x%x read fail\r\n", addr);
goto end;
}
end:
return ret;
}
int pca954x_reset_reg_i2c_write_byte(int addr, u8 value)
{
int bus;
int client_addr;
int offset;
int ret;
bus = PCA9548_I2C_GET_BUS(addr);
client_addr = PCA9548_I2C_GET_CLIENT(addr);
offset = PCA9548_I2C_GET_OFFSET(addr);
ret = pca954x_reset_i2c_write(bus, client_addr, offset, value);
if (ret < 0) {
PCA954X_DEBUG(" 0x%x write fail\r\n", addr);
goto end;
}
end:
return ret;
}
void pca954x_hw_do_reset_by_i2c(int addr, u8 value)
{
int ret;
PCA954X_DEBUG("write i2c cpld[0x%x], value[%d]\n", addr, value);
ret = pca954x_reset_reg_i2c_write_byte(addr, value);
if (ret < 0) {
PCA954X_DEBUG("write cpld pca9548 reset reg failed, ret = %d \n", ret);
}
}
u8 pca954x_get_umask_by_i2c(int addr)
{
u8 value = 0xFF;
int ret;
ret = pca954x_reset_reg_i2c_read_byte(addr, &value);
PCA954X_DEBUG("read i2c cpld[0x%x], value[%d], ret = %d\n", addr, value, ret);
return value;
}
void pca954x_hw_do_reset_by_lpc(int io_port, u8 value)
{
PCA954X_DEBUG("write lpc offset[0x%x], value[%d]\n", (u16)io_port, value);
outb(value, (u16)io_port);
}
u8 pca954x_get_umask_by_lpc(int io_port)
{
u8 value;
value = inb(io_port);
PCA954X_DEBUG("read lpc offset[0x%x], value[%d]\n", (u16)io_port, value);
return value;
}
int pca954x_hw_do_reset_new(struct i2c_adapter *adap,
struct i2c_client *client, u32 chan)
{
pca9548_cfg_info_t *cfg_info;
int ret = -1;
cfg_info = get_pca9548_cfg_info(adap->nr, client->addr);
if (cfg_info == NULL && g_notify_to_do_reset == NULL) {
PCA954X_DEBUG("fpga_do_pca954x_reset_func do nothing.\n");
return ret;
}
if(cfg_info != NULL) {
ret = pca9548_reset_ctrl(cfg_info, adap, client, chan);
} else {
ret = pca954x_hw_do_reset(adap->nr, client->addr);
}
if (ret < 0) {
PCA954X_DEBUG("pca954x_hw_do_reset failed.\n");
}
return ret;
}
/******************************end 9548 reset***********************************/
static int pca954x_do_reset(struct i2c_adapter *adap,
void *client, u32 chan)
{
struct i2c_client *new_client;
int ret = -1;
PCA954X_DEBUG("do pca954x reset x86\n");
new_client =(struct i2c_client *) client;
ret = pca954x_hw_do_reset_new(adap, new_client, chan);
if (ret < 0) {
PCA954X_DEBUG("pca954x_do_reset failed.\n");
return ret;
}
PCA954X_DEBUG("pca954x_do_reset success.\n");
ret = 0;
return ret;
}
static int pca954x_deselect_mux(struct i2c_mux_core *muxc, u32 chan)
{
struct pca954x *data = i2c_mux_priv(muxc);
struct i2c_client *client = data->client;
int ret, rv;
struct i2c_client * new_client;
/* Deselect active channel */
data->last_chan = 0;
ret = pca954x_reg_write(muxc->parent, client, data->last_chan);
if (ret < 0) {
new_client =(struct i2c_client *) client;
dev_warn(&new_client->dev, "pca954x close chn failed, do reset.\n");
rv = pca954x_do_reset(client->adapter, client, chan);
if (rv == 0) {
ret = 0;
}
}
pca954x_setmuxflag(client, 1);
(void)pca954x_reg_write(muxc->parent, client, data->last_chan);
return ret;
}
static irqreturn_t pca954x_irq_handler(int irq, void *dev_id)
{
struct pca954x *data = dev_id;
unsigned int child_irq;
int ret, i, handled = 0;
ret = i2c_smbus_read_byte(data->client);
if (ret < 0)
return IRQ_NONE;
for (i = 0; i < data->chip->nchans; i++) {
if (ret & BIT(PCA954X_IRQ_OFFSET + i)) {
child_irq = irq_linear_revmap(data->irq, i);
handle_nested_irq(child_irq);
handled++;
}
}
return handled ? IRQ_HANDLED : IRQ_NONE;
}
static void pca954x_irq_mask(struct irq_data *idata)
{
struct pca954x *data = irq_data_get_irq_chip_data(idata);
unsigned int pos = idata->hwirq;
unsigned long flags;
raw_spin_lock_irqsave(&data->lock, flags);
data->irq_mask &= ~BIT(pos);
if (!data->irq_mask)
disable_irq(data->client->irq);
raw_spin_unlock_irqrestore(&data->lock, flags);
}
static void pca954x_irq_unmask(struct irq_data *idata)
{
struct pca954x *data = irq_data_get_irq_chip_data(idata);
unsigned int pos = idata->hwirq;
unsigned long flags;
raw_spin_lock_irqsave(&data->lock, flags);
if (!data->irq_mask)
enable_irq(data->client->irq);
data->irq_mask |= BIT(pos);
raw_spin_unlock_irqrestore(&data->lock, flags);
}
static int pca954x_irq_set_type(struct irq_data *idata, unsigned int type)
{
if ((type & IRQ_TYPE_SENSE_MASK) != IRQ_TYPE_LEVEL_LOW)
return -EINVAL;
return 0;
}
static struct irq_chip pca954x_irq_chip = {
.name = "i2c-mux-pca954x",
.irq_mask = pca954x_irq_mask,
.irq_unmask = pca954x_irq_unmask,
.irq_set_type = pca954x_irq_set_type,
};
static int pca954x_irq_setup(struct i2c_mux_core *muxc)
{
struct pca954x *data = i2c_mux_priv(muxc);
struct i2c_client *client = data->client;
int c, err, irq;
if (!data->chip->has_irq || client->irq <= 0)
return 0;
raw_spin_lock_init(&data->lock);
data->irq = irq_domain_add_linear(client->dev.of_node,
data->chip->nchans,
&irq_domain_simple_ops, data);
if (!data->irq)
return -ENODEV;
for (c = 0; c < data->chip->nchans; c++) {
irq = irq_create_mapping(data->irq, c);
irq_set_chip_data(irq, data);
irq_set_chip_and_handler(irq, &pca954x_irq_chip,
handle_simple_irq);
}
err = devm_request_threaded_irq(&client->dev, data->client->irq, NULL,
pca954x_irq_handler,
IRQF_ONESHOT | IRQF_SHARED,
"pca954x", data);
if (err)
goto err_req_irq;
disable_irq(data->client->irq);
return 0;
err_req_irq:
for (c = 0; c < data->chip->nchans; c++) {
irq = irq_find_mapping(data->irq, c);
irq_dispose_mapping(irq);
}
irq_domain_remove(data->irq);
return err;
}
/*
* I2C init/probing/exit functions
*/
static int pca954x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adap = to_i2c_adapter(client->dev.parent);
struct pca954x_platform_data *pdata = dev_get_platdata(&client->dev);
struct device_node *of_node = client->dev.of_node;
bool idle_disconnect_dt;
struct gpio_desc *gpio;
int num, force, class;
struct i2c_mux_core *muxc;
struct pca954x *data;
const struct of_device_id *match;
int ret;
if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_BYTE))
return -ENODEV;
muxc = i2c_mux_alloc(adap, &client->dev,
PCA954X_MAX_NCHANS, sizeof(*data), 0,
pca954x_select_chan, pca954x_deselect_mux);
if (!muxc)
return -ENOMEM;
data = i2c_mux_priv(muxc);
i2c_set_clientdata(client, muxc);
data->client = client;
/* Get the mux out of reset if a reset GPIO is specified. */
gpio = devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
/* Write the mux register at addr to verify
* that the mux is in fact present. This also
* initializes the mux to disconnected state.
*/
if ((i2c_smbus_write_byte(client, 0) < 0) && (force_create_bus == 0)) {
dev_warn(&client->dev, "probe failed\n");
return -ENODEV;
}
match = of_match_device(of_match_ptr(pca954x_of_match), &client->dev);
if (match)
data->chip = of_device_get_match_data(&client->dev);
else
data->chip = &chips[id->driver_data];
data->last_chan = 0; /* force the first selection */
idle_disconnect_dt = of_node &&
of_property_read_bool(of_node, "i2c-mux-idle-disconnect");
ret = pca954x_irq_setup(muxc);
if (ret)
goto fail_del_adapters;
/* Now create an adapter for each channel */
for (num = 0; num < data->chip->nchans; num++) {
bool idle_disconnect_pd = false;
force = 0; /* dynamic adap number */
class = 0; /* no class by default */
if (pdata) {
if (num < pdata->num_modes) {
/* force static number */
force = pdata->modes[num].adap_id;
class = pdata->modes[num].class;
} else
/* discard unconfigured channels */
break;
idle_disconnect_pd = pdata->modes[num].deselect_on_exit;
}
data->deselect |= (idle_disconnect_pd ||
idle_disconnect_dt) << num;
ret = i2c_mux_add_adapter(muxc, force, num, class);
if (ret)
goto fail_del_adapters;
}
dev_info(&client->dev,
"registered %d multiplexed busses for I2C %s %s\n",
num, data->chip->muxtype == pca954x_ismux
? "mux" : "switch", client->name);
return 0;
fail_del_adapters:
i2c_mux_del_adapters(muxc);
return ret;
}
static int pca954x_remove(struct i2c_client *client)
{
struct i2c_mux_core *muxc = i2c_get_clientdata(client);
struct pca954x *data = i2c_mux_priv(muxc);
int c, irq;
if (data->irq) {
for (c = 0; c < data->chip->nchans; c++) {
irq = irq_find_mapping(data->irq, c);
irq_dispose_mapping(irq);
}
irq_domain_remove(data->irq);
}
i2c_mux_del_adapters(muxc);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int pca954x_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct i2c_mux_core *muxc = i2c_get_clientdata(client);
struct pca954x *data = i2c_mux_priv(muxc);
data->last_chan = 0;
return i2c_smbus_write_byte(client, 0);
}
#endif
static SIMPLE_DEV_PM_OPS(pca954x_pm, NULL, pca954x_resume);
static struct i2c_driver pca954x_driver = {
.driver = {
.name = "pca954x",
.pm = &pca954x_pm,
.of_match_table = of_match_ptr(pca954x_of_match),
},
.probe = pca954x_probe,
.remove = pca954x_remove,
.id_table = pca954x_id,
};
module_i2c_driver(pca954x_driver);
MODULE_AUTHOR("support support@ragile.com");
MODULE_DESCRIPTION("PCA954x I2C mux/switch driver");
MODULE_LICENSE("GPL");