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rf_module.c
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#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/spi/spi.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/cdev.h>
#include <linux/gpio.h>
#include <linux/device.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/poll.h>
#include <linux/of_gpio.h>
#include <linux/ktime.h>
#include <linux/hrtimer.h>
#include <linux/nrf24.h>
#include "rf_module.h"
#include "rf_helpers.h"
#include "rf_sysfs.h"
#define N_SPI_MINORS 9
static struct class *rf_class;
static struct cdev rf_cdev;
static dev_t rf_devt; /* Holds the Major number */
static DECLARE_BITMAP(minors, N_SPI_MINORS);
static LIST_HEAD(device_list);
static DEFINE_MUTEX(device_list_lock);
/*
* Sysfs attributes
*/
static DEVICE_ATTR(registers, 0600, show_reg, store_reg);
static DEVICE_ATTR(config, 0400, show_config, NULL);
static DEVICE_ATTR(statistics, 0400, show_statistics, NULL);
static DEVICE_ATTR(scanlink, 0600, show_scanlink, store_scanlink);
static DEVICE_ATTR(rftest, 0200, NULL, store_rftest);
static struct attribute *rf_attrs[] = {
&dev_attr_registers.attr,
&dev_attr_config.attr,
&dev_attr_statistics.attr,
&dev_attr_scanlink.attr,
&dev_attr_rftest.attr,
NULL,
};
static struct attribute_group rf_attr_group = {
.attrs = rf_attrs,
};
/*
* IRQ Stuff
*/
static void prx_nonsleep(struct rf_data *rf);
static irqreturn_t rf_hard_irq(int irq, void *handle)
{
struct rf_data *rf = handle;
ce_low(rf->spi);
if (!IS_SETTED(rf->config, BIT(0))) { /* in PTX */
trace_puts("TX hard IRQ\n");
if (rf->goto_prx) {
rf->goto_prx = false;
prx_nonsleep(rf);
return IRQ_HANDLED;
}
} else {
trace_puts("RX hard IRQ\n");
}
return IRQ_WAKE_THREAD;
}
void prx_complete(void *context);
static struct spi_message prx_nonsleep_msg;
static void prx_nonsleep(struct rf_data *rf)
{
static struct spi_transfer t[4];
SET_BIT(rf->config, BIT(0)); /* go to PRX */
memset(&t, '\0', sizeof(t));
t[0].tx_buf = "\x20"; /* W_REGISTER(CONFIG_REG) */
t[0].len = 1;
t[1].tx_buf = &rf->config;
t[1].len = 1;
t[1].cs_change = 1;
t[2].tx_buf = "\x27"; /* W_REGISTER(STATUS_REG) */
t[2].len = 1;
t[3].tx_buf = "\x70";
t[3].len = 1;
spi_message_init(&prx_nonsleep_msg);
spi_message_add_tail(&t[0], &prx_nonsleep_msg);
spi_message_add_tail(&t[1], &prx_nonsleep_msg);
spi_message_add_tail(&t[2], &prx_nonsleep_msg);
spi_message_add_tail(&t[3], &prx_nonsleep_msg);
prx_nonsleep_msg.complete = prx_complete;
prx_nonsleep_msg.context = rf;
trace_puts("Going to PRX start\n");
BUG_ON(spi_async(rf->spi, &prx_nonsleep_msg));
}
void prx_complete(void *context)
{
struct rf_data *rf = context;
BUG_ON(prx_nonsleep_msg.status);
complete(&rf->tx_complete);
ce_high(rf->spi);
trace_puts("Going to PRX complete\n");
}
static irqreturn_t rf_irq(int irq, void *data)
{
u8 status;
struct rf_data *rf = data;
read_reg(rf->spi, STATUS_REG, &status, 1);
if (IS_SETTED(status, BIT(5))) {
_DEBUG("TX IRQ served");
complete(&rf->tx_complete);
}
if (IS_SETTED(status, BIT(6))) {
_DEBUG("RX IRQ served");
rf->new_rx_data = 1;
wake_up(&rf->rx_wq);
}
write_reg(rf->spi, STATUS_REG, &status, 1); /* clear irq flags */
return IRQ_HANDLED;
}
/*
* File oprations
*/
static int rf_open(struct inode *ip, struct file *fp)
{
struct rf_data *rf;
mutex_lock(&device_list_lock);
list_for_each_entry(rf, &device_list, device_entry) {
if (rf->devt == ip->i_rdev) {
fp->private_data = rf;
if (rf->inuse) {
mutex_unlock(&device_list_lock);
return -EBUSY;
}
rf->inuse = true;
pwr_up(rf->spi);
mutex_unlock(&device_list_lock);
return 0;
}
}
mutex_unlock(&device_list_lock);
return -ENODEV;
}
static int rf_release(struct inode *ip, struct file *fp)
{
struct rf_data *rf = fp->private_data;
if (!rf)
return -ENODEV;
pwr_down(rf->spi);
rf->inuse = false;
fp->private_data = NULL;
return 0;
}
static ssize_t rf_write(struct file *fp,
const char __user *buf,
size_t len,
loff_t *off)
{
int status;
u8 pld[32];
struct rf_data *rf = fp->private_data;
BUG_ON(!rf);
len = min(sizeof(pld), len);
if (copy_from_user(pld, buf, len))
return -EIO;
rf->goto_prx = false;
flush_tx(rf->spi);
write_tx(rf->spi, pld, len);
ptx_mode(rf->spi);
rf_led_on(rf);
reinit_completion(&rf->tx_complete);
ce_high(rf->spi);
status = wait_for_completion_interruptible(&rf->tx_complete);
ce_low(rf->spi);
rf_led_off(rf);
if (status) {
rf->timeout_count++;
return status;
}
rf->tx_bytes_count += len;
return len;
}
static ssize_t rf_read(struct file *fp,
char *buf,
size_t len,
loff_t *off)
{
u8 feature, pldsiz;
int status;
char pld[32];
struct rf_data *rf = fp->private_data;
BUG_ON(!rf);
if (*off > 0)
return 0;
if (len < 32)
return -EINVAL;
rf->goto_prx = false;
rf->new_rx_data = 0;
flush_rx(rf->spi);
prx_mode(rf->spi);
rf_led_on(rf);
ce_high(rf->spi);
status = wait_event_interruptible(rf->rx_wq,
rf->new_rx_data);
ce_low(rf->spi);
rf_led_off(rf);
if (status) {
rf->timeout_count++;
return status;
}
read_reg(rf->spi, FEATURE_REG, &feature, 1);
if (IS_SETTED(feature, BIT(2)))
read_rx_pld_wid(rf->spi, &pldsiz);
else
read_reg(rf->spi, RX_PW_P0_REG, &pldsiz, 1);
read_rx(rf->spi, pld, pldsiz);
rf->rx_bytes_count += pldsiz;
if (copy_to_user(buf, pld, pldsiz))
return -EIO;
return pldsiz;
}
static long rf_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
{
long status = 0;
struct rf_data *rf = fp->private_data;
u8 rxbuf[5];
BUG_ON(!fp);
mutex_lock(&rf->bus_lock);
switch (cmd) {
case NRF24_IOCSAA:
_DEBUG("NRF24_IOCSAA: 0x%02lx", arg);
write_reg(rf->spi, EN_AA_REG, (u8 *)&arg, 1);
break;
case NRF24_IOCGAA:
_DEBUG("NRF24_IOCGAA");
read_reg(rf->spi, EN_AA_REG, rxbuf, 1);
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOCSCRC: /* Bit 2,3 of CONFIG register */
_DEBUG("NRF24_IOCSCRC: %ld", arg);
read_reg(rf->spi, CONFIG_REG, rxbuf, 1);
switch (arg) {
case 0:
rxbuf[0] &= ~(BIT(2) | BIT(3));
break;
case 1:
rxbuf[0] |= BIT(3);
rxbuf[0] &= ~(BIT(2));
break;
case 2:
rxbuf[0] |= (BIT(2) | BIT(3));
break;
}
write_reg(rf->spi, CONFIG_REG, rxbuf, 1);
break;
case NRF24_IOCGCRC:
_DEBUG("NRF24_IOCGCRC");
read_reg(rf->spi, CONFIG_REG, rxbuf, 1);
if (!IS_SETTED(BIT(3), rxbuf[0])) /* 0bxxxx0xxx => Disabled */
put_user(0, (u8 __user *)arg);
else if (!IS_SETTED(BIT(2), rxbuf[0])) /* 0bxxxx10xx => Enabled, 1 byte*/
put_user(1, (u8 __user *)arg);
else
put_user(2, (u8 __user *)arg); /* 0bxxxx11xx => Enabled, 2 bytes */
break;
case NRF24_IOCSCH:
_DEBUG("NRF24_IOCSCH: %ld", arg);
write_reg(rf->spi, RF_CH_REG, (u8 *)&arg, 1);
break;
case NRF24_IOCGCH:
_DEBUG("NRF24_IOCGCH");
read_reg(rf->spi, RF_CH_REG, rxbuf, 1);
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOCSPW:
_DEBUG("NRF24_IOCSPW: %ld", arg);
write_reg(rf->spi, RX_PW_P0_REG, (u8 *)&arg, 1);
write_reg(rf->spi, RX_PW_P1_REG, (u8 *)&arg, 1);
write_reg(rf->spi, RX_PW_P2_REG, (u8 *)&arg, 1);
write_reg(rf->spi, RX_PW_P3_REG, (u8 *)&arg, 1);
write_reg(rf->spi, RX_PW_P4_REG, (u8 *)&arg, 1);
write_reg(rf->spi, RX_PW_P5_REG, (u8 *)&arg, 1);
break;
case NRF24_IOCGPW:
_DEBUG("NRF24_IOCGPW");
read_reg(rf->spi, RX_PW_P0_REG, rxbuf, 1);
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOCSTXADDR:
do {
u8 aw;
read_reg(rf->spi, SETUP_AW_REG, &aw, 1);
aw += 2;
if (copy_from_user(rxbuf, (u8 __user *)arg, aw)) {
pr_err("copy_from_user fails");
status = -EFAULT;
break;
}
switch (aw) {
case 3:
_DEBUG("NRF24_IOCSTXADDR: %02x:%02x:%02x",
rxbuf[0], rxbuf[1], rxbuf[2]);
break;
case 4:
_DEBUG("NRF24_IOCSTXADDR: %02x:%02x:%02x:%02x",
rxbuf[0], rxbuf[1], rxbuf[2], rxbuf[3]);
break;
case 5:
_DEBUG("NRF24_IOCSTXADDR: %02x:%02x:%02x:%02x:%02x",
rxbuf[0], rxbuf[1], rxbuf[2], rxbuf[3], rxbuf[4]);
break;
}
write_reg(rf->spi, TX_ADDR_REG, rxbuf, aw);
} while (0);
break;
case NRF24_IOCGTXADDR:
_DEBUG("NRF24_IOCGTXADDR");
do {
u8 aw;
read_reg(rf->spi, SETUP_AW_REG, &aw, 1);
aw += 2;
read_reg(rf->spi, TX_ADDR_REG, rxbuf, aw);
if (copy_to_user((u8 __user *)arg, rxbuf, aw)) {
pr_err("copy_to_user fails");
status = -EFAULT;
break;
}
} while (0);
break;
case NRF24_IOCSRXADDR:
do {
u8 aw;
read_reg(rf->spi, SETUP_AW_REG, &aw, 1);
aw += 2;
if (copy_from_user(rxbuf, (u8 __user *)arg, aw)) {
pr_err("copy_from_user fails");
status = -EFAULT;
break;
}
switch (aw) {
case 3:
_DEBUG("NRF24_IOCSRXADDR: %02x:%02x:%02x",
rxbuf[0], rxbuf[1], rxbuf[2]);
break;
case 4:
_DEBUG("NRF24_IOCSRXADDR: %02x:%02x:%02x:%02x",
rxbuf[0], rxbuf[1], rxbuf[2], rxbuf[3]);
break;
case 5:
_DEBUG("NRF24_IOCSRXADDR: %02x:%02x:%02x:%02x:%02x",
rxbuf[0], rxbuf[1], rxbuf[2], rxbuf[3], rxbuf[4]);
break;
}
write_reg(rf->spi, RX_ADDR_P0_REG, rxbuf, aw);
} while (0);
break;
case NRF24_IOCSRXADDR_P1:
do {
u8 aw;
read_reg(rf->spi, SETUP_AW_REG, &aw, 1);
aw += 2;
if (copy_from_user(rxbuf, (u8 __user *)arg, aw)) {
pr_err("copy_from_user fails");
status = -EFAULT;
break;
}
switch (aw) {
case 3:
_DEBUG("NRF24_IOCSRXADDR_P1: %02x:%02x:%02x",
rxbuf[0], rxbuf[1], rxbuf[2]);
break;
case 4:
_DEBUG("NRF24_IOCSRXADDR_P1: %02x:%02x:%02x:%02x",
rxbuf[0], rxbuf[1], rxbuf[2], rxbuf[3]);
break;
case 5:
_DEBUG("NRF24_IOCSRXADDR_P1: %02x:%02x:%02x:%02x:%02x",
rxbuf[0], rxbuf[1], rxbuf[2], rxbuf[3], rxbuf[4]);
break;
}
write_reg(rf->spi, RX_ADDR_P1_REG, rxbuf, aw);
} while (0);
break;
case NRF24_IOCSRXADDR_P2:
_DEBUG("NRF24_IOCSRXADDR_P2: %02lx", arg);
write_reg(rf->spi, RX_ADDR_P2_REG, (u8 *)&arg, 1);
break;
case NRF24_IOCSRXADDR_P3:
_DEBUG("NRF24_IOCSRXADDR_P3: %02lx", arg);
write_reg(rf->spi, RX_ADDR_P3_REG, (u8 *)&arg, 1);
break;
case NRF24_IOCSRXADDR_P4:
_DEBUG("NRF24_IOCSRXADDR_P4: %02lx", arg);
write_reg(rf->spi, RX_ADDR_P4_REG, (u8 *)&arg, 1);
break;
case NRF24_IOCSRXADDR_P5:
_DEBUG("NRF24_IOCSRXADDR_P5: %02lx", arg);
write_reg(rf->spi, RX_ADDR_P5_REG, (u8 *)&arg, 1);
break;
case NRF24_IOCGRXADDR:
_DEBUG("NRF24_IOCGRXADDR");
do {
u8 aw;
read_reg(rf->spi, SETUP_AW_REG, &aw, 1);
aw += 2;
read_reg(rf->spi, RX_ADDR_P0_REG, rxbuf, aw);
if (copy_to_user((u8 __user *)arg, rxbuf, aw)) {
pr_err("copy_to_user fails");
status = -EFAULT;
break;
}
} while (0);
break;
case NRF24_IOCGRXADDR_P1:
_DEBUG("NRF24_IOCGRXADDR_P1");
do {
u8 aw;
read_reg(rf->spi, SETUP_AW_REG, &aw, 1);
aw += 2;
read_reg(rf->spi, RX_ADDR_P1_REG, rxbuf, aw);
if (copy_to_user((u8 __user *)arg, rxbuf, aw)) {
pr_err("copy_to_user fails");
status = -EFAULT;
break;
}
} while (0);
break;
case NRF24_IOCGRXADDR_P2:
_DEBUG("NRF24_IOCGRXADDR_P2");
read_reg(rf->spi, RX_ADDR_P2_REG, rxbuf, 1);
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOCGRXADDR_P3:
_DEBUG("NRF24_IOCGRXADDR_P3");
read_reg(rf->spi, RX_ADDR_P3_REG, rxbuf, 1);
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOCGRXADDR_P4:
_DEBUG("NRF24_IOCGRXADDR_P4");
read_reg(rf->spi, RX_ADDR_P4_REG, rxbuf, 1);
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOCGRXADDR_P5:
_DEBUG("NRF24_IOCGRXADDR_P5");
read_reg(rf->spi, RX_ADDR_P5_REG, rxbuf, 1);
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOCSENRXADDR:
_DEBUG("NRF24_IOCSENRXADDR: %02lx", arg);
write_reg(rf->spi, EN_RXADDR_REG, (u8 *)&arg, 1);
break;
case NRF24_IOCGENRXADDR:
_DEBUG("NRF24_IOCGENRXADDR");
read_reg(rf->spi, EN_RXADDR_REG, rxbuf, 1);
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOCSAW:
_DEBUG("NRF24_IOCSAW: %ld", arg);
arg -= 2;
write_reg(rf->spi, SETUP_AW_REG, (u8 *)&arg, 1);
break;
case NRF24_IOCGAW:
_DEBUG("NRF24_IOCGAW");
read_reg(rf->spi, SETUP_AW_REG, rxbuf, 1);
rxbuf[0] += 2;
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOCSRETR:
_DEBUG("NRF24_IOCSRETR: 0x%02lx", arg);
write_reg(rf->spi, SETUP_RETR_REG, (u8 *)&arg, 1);
break;
case NRF24_IOCGRETR:
_DEBUG("NRF24_IOCGRETR");
read_reg(rf->spi, SETUP_RETR_REG, rxbuf, 1);
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOCSRF:
_DEBUG("NRF24_IOCSRF: 0x%02lx", arg);
write_reg(rf->spi, RF_SETUP_REG, (u8 *)&arg, 1);
break;
case NRF24_IOCGRF:
_DEBUG("NRF24_IOCGRF");
read_reg(rf->spi, RF_SETUP_REG, rxbuf, 1);
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOCSDYNPLD:
_DEBUG("NRF24_IOCSDYNPLD: 0x%02lx", arg);
write_reg(rf->spi, DYNPD_REG, (u8 __user *)&arg, 1);
break;
case NRF24_IOCGDYNPLD:
_DEBUG("NRF24_IOCGDYNPLD");
read_reg(rf->spi, DYNPD_REG, rxbuf, 1);
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOCSFEATURE:
_DEBUG("NRF24_IOCSFEATURE: 0x%02lx", arg);
write_reg(rf->spi, FEATURE_REG, (u8 __user *)&arg, 1);
break;
case NRF24_IOCGFEATURE:
_DEBUG("NRF24_IOCGFEATURE");
read_reg(rf->spi, FEATURE_REG, rxbuf, 1);
put_user(rxbuf[0], (u8 __user *)arg);
break;
case NRF24_IOTTR:
_DEBUG("NRF24_IOTTR");
do {
u8 tx_pld[32];
u8 rx_pld[32];
struct nrf_exch krn;
struct nrf_exch *usr = (struct nrf_exch *)arg;
int n = copy_from_user(&krn, usr, sizeof(krn));
if (n) {
status = -EIO;
break;
}
n = copy_from_user(tx_pld, krn.tx, min(sizeof(tx_pld), krn.tx_siz));
if (n) {
status = -EIO;
break;
}
status = exchange_ttr(rf, tx_pld, krn.tx_siz,
rx_pld, &krn.rx_siz, krn.timeout);
if (status == 0) {
status = -ETIMEDOUT;
break;
} else if (status < 0)
break; /* return status error */
_DEBUG("TTR received %d bytes", krn.rx_siz);
n = copy_to_user(krn.rx, rx_pld, krn.rx_siz);
if (n) {
status = -EIO;
break;
}
put_user(krn.rx_siz, &usr->rx_siz);
status = 0;
_DEBUG("Returning 0");
} while (0);
break;
case NRF24_IOREADMULTICEIVER:
_DEBUG("NRF24_IOREADMULTICEIVER");
do {
u8 rx_pld[32];
struct nrf_read_multiceiver *usr = (struct nrf_read_multiceiver *)arg;
struct nrf_read_multiceiver krn;
int n = copy_from_user(&krn, usr, sizeof(krn));
if (n) {
pr_err("copy_from_user fails");
status = -EIO;
break;
}
rf->goto_prx = false;
rf->new_rx_data = 0;
flush_rx(rf->spi);
prx_mode(rf->spi);
write_reg(rf->spi, STATUS_REG, "\x70", 1);
rf_led_on(rf);
ce_high(rf->spi);
if (krn.timeout > 0) {
ktime_t ktimeout = ktime_set(0, (krn.timeout * 1000000) % 1000000000);
_DEBUG("User timeout: %u", krn.timeout);
status = wait_event_interruptible_hrtimeout(
rf->rx_wq,
rf->new_rx_data,
ktimeout);
} else {
_DEBUG("No user timeout");
status = wait_event_interruptible(rf->rx_wq, rf->new_rx_data);
}
ce_low(rf->spi);
rf_led_off(rf);
if (!status) {
u8 aw, status, pldsiz, feature, dynpd, pipe_no, rxaddr[5], pipe_reg = 0, pipe_addr_reg = 0;
/* retrieve the pipe number */
read_reg(rf->spi, STATUS_REG, &status, 1);
pipe_no = (status & 0b1110) >> 1;
_DEBUG("Received at pipe %d", pipe_no);
switch (pipe_no) {
case 0: pipe_reg = RX_PW_P0_REG; pipe_addr_reg = RX_ADDR_P0_REG; break;
case 1: pipe_reg = RX_PW_P1_REG; pipe_addr_reg = RX_ADDR_P1_REG; break;
case 2: pipe_reg = RX_PW_P2_REG; pipe_addr_reg = RX_ADDR_P2_REG; break;
case 3: pipe_reg = RX_PW_P3_REG; pipe_addr_reg = RX_ADDR_P3_REG; break;
case 4: pipe_reg = RX_PW_P4_REG; pipe_addr_reg = RX_ADDR_P4_REG; break;
case 5: pipe_reg = RX_PW_P5_REG; pipe_addr_reg = RX_ADDR_P5_REG; break;
}
/* retrieve the payload size */
read_reg(rf->spi, FEATURE_REG, &feature, 1);
read_reg(rf->spi, DYNPD_REG, &dynpd, 1);
if (IS_SETTED(feature, BIT(2)) && IS_SETTED(dynpd, BIT(pipe_no)))
read_rx_pld_wid(rf->spi, &pldsiz);
else
read_reg(rf->spi, pipe_reg, &pldsiz, 1);
/* retrieve the address width */
read_reg(rf->spi, SETUP_AW_REG, &aw, 1);
aw += 2;
/* retrieve the pipe's address */
switch (pipe_addr_reg) {
case RX_ADDR_P0_REG:
case RX_ADDR_P1_REG:
read_reg(rf->spi, pipe_addr_reg, rxaddr, aw);
break;
case RX_ADDR_P2_REG:
case RX_ADDR_P3_REG:
case RX_ADDR_P4_REG:
case RX_ADDR_P5_REG:
read_reg(rf->spi, RX_ADDR_P1_REG, rxaddr, aw);
read_reg(rf->spi, pipe_addr_reg, &rxaddr[aw-1], 1);
break;
}
/* read payload */
read_rx(rf->spi, rx_pld, pldsiz);
/* update user stuff */
if (copy_to_user(krn.rx, rx_pld, pldsiz)) {
pr_err("copy_to_user fails");
status = -EIO;
break;
}
if (copy_to_user(krn.rx_addr, rxaddr, aw)) {
pr_err("copy_to_user fails");
status = -EIO;
break;
}
put_user(pldsiz, &usr->rx_siz);
put_user(aw, &usr->rx_addr_len);
status = 0;
}
} while (0);
break;
default:
pr_warn("Unsupported ioctl used on file %s\n", fp->f_path.dentry->d_name.name);
status = -ENOTTY;
break;
}
mutex_unlock(&rf->bus_lock);
return status;
}
static struct file_operations fops = {
.owner = THIS_MODULE,
.read = rf_read,
.write = rf_write,
.open = rf_open,
.unlocked_ioctl = rf_ioctl,
.release = rf_release,
};
/*
* Driver operations
*/
static int rf_probe(struct spi_device *spi)
{
int status;
unsigned long minor;
struct device *devp;
struct rf_data *rf;
struct device_node *np = spi->dev.of_node;
int gpio_irq;
dev_info(&spi->dev, "nrf24.ko: device probe");
if (!np) {
dev_err(&spi->dev, "No device tree, aborting");
return -ENODEV;
}
rf = kzalloc(sizeof (struct rf_data), GFP_KERNEL);
if (!rf)
return -ENOMEM;
rf->spi = spi;
rf->new_rx_data = 0;
rf->gpio_ce = of_get_named_gpio(np, "gpio-ce", 0);
if (rf->gpio_ce < 0) {
dev_err(&spi->dev, "No gpio-ce, aborting");
return -ENODEV;
}
rf->gpio_led = of_get_named_gpio(np, "gpio-led", 0);
INIT_LIST_HEAD(&rf->device_entry);
mutex_init(&rf->bus_lock);
init_completion(&rf->tx_complete);
init_waitqueue_head(&rf->rx_wq);
scnprintf(rf->devname, DEVNAME_MAX, "nrf24-%d.%d", spi->master->bus_num, spi->chip_select);
gpio_irq = of_get_named_gpio(np, "gpio-irq", 0);
spi->irq = gpio_to_irq(gpio_irq);
if (spi->irq < 0) {
dev_err(&spi->dev, "No IRQ configured, aborting");
return -ENODEV;
}
spi->bits_per_word = 8;
spi->mode = SPI_MODE_0;
spi_setup(spi);
spi_set_drvdata(spi, rf);
status = request_threaded_irq(spi->irq, rf_hard_irq, rf_irq, IRQF_TRIGGER_FALLING, rf->devname, rf);
if (status) {
dev_err(&spi->dev, "request_threaded_irq failed, aborting");
goto kfree_out;
}
status = gpio_request(rf->gpio_ce, rf->devname);
if (status) {
dev_err(&spi->dev, "Error while requesting CE gpio, aborting");
goto free_irq_out;
}
gpio_direction_output(rf->gpio_ce, 0);
if (rf->gpio_led > 0) {
status = gpio_request(rf->gpio_led, "nRF24L01+ debug led");
if (status) {
dev_err(&spi->dev, "Error while requesting led gpio, aborting");
goto gpio_free_out;
}
gpio_direction_output(rf->gpio_led, 1); /* 1=off, 0=on */
}
/* Default setup */
write_reg(spi, EN_RXADDR_REG, "\x01", 1); /* enable only data pipe 0 */
/* Sysfs attributes */
status = sysfs_create_group(&spi->dev.kobj, &rf_attr_group);
if (status) {
dev_err(&spi->dev, "Error while creating sysfs files, aborting");
goto gpio_free_out;
}
/* Device creation */
mutex_lock(&device_list_lock);
minor = find_first_zero_bit(minors, N_SPI_MINORS);
if (minor > N_SPI_MINORS) {
mutex_unlock(&device_list_lock);
status = -ENODEV;
dev_err(&spi->dev, "Max supported devices reached, aborting");
goto sysfs_out;
}
rf->devt = MKDEV(MAJOR(rf_devt), MINOR(minor));
devp = device_create(rf_class, &spi->dev, rf->devt, rf, "%s", rf->devname);
if (IS_ERR(devp)) {
mutex_unlock(&device_list_lock);
status = PTR_ERR(devp);
dev_err(&spi->dev, "Error while creating device file, aborting");
goto sysfs_out;
}
set_bit(minor, minors);
list_add(&rf->device_entry, &device_list);
mutex_unlock(&device_list_lock);
dev_info(&spi->dev, "Device probed with success: %s", rf->devname);
return 0;
sysfs_out:
sysfs_remove_group(&spi->dev.kobj, &rf_attr_group);
gpio_free_out:
if (rf->gpio_led > 0)
gpio_free(rf->gpio_led);
gpio_free(rf->gpio_ce);
free_irq_out:
free_irq(spi->irq, rf);
kfree_out:
kfree(rf);
return status;
}
static int rf_remove(struct spi_device *spi)
{
struct rf_data *rf = spi_get_drvdata(spi);
_DEBUG("");
BUG_ON(!rf);
mutex_lock(&device_list_lock);
list_del(&rf->device_entry);
clear_bit(MINOR(rf->devt), minors);
device_destroy(rf_class, rf->devt);
spi_set_drvdata(spi, NULL);
mutex_unlock(&device_list_lock);
free_irq(spi->irq, rf);
gpio_free(rf->gpio_ce);
if (rf->gpio_led > 0)
gpio_free(rf->gpio_led);
sysfs_remove_group(&spi->dev.kobj, &rf_attr_group);
kfree(rf);
return 0;
}
static const struct of_device_id rf_of_ids[] = {
{ .compatible = "nrf24" },
{},
};
static struct spi_driver rf_driver = {
.driver = {
.name = "nrf24",
.owner = THIS_MODULE,
.of_match_table = rf_of_ids,
},
.probe = rf_probe,
.remove = rf_remove,
};
static int __init rf_init(void)
{
int status;
pr_info("nrf24.ko: init");
status = alloc_chrdev_region(&rf_devt, 0, N_SPI_MINORS, "nrf24");
if (status)
return status;
cdev_init(&rf_cdev, &fops);
status = cdev_add(&rf_cdev, rf_devt, N_SPI_MINORS);
if (status)
goto unregister_chrdev_region_out;
rf_class = class_create(THIS_MODULE, "nrf24");
if (IS_ERR(rf_class)) {
status = PTR_ERR(rf_class);
goto cdev_del_out;
}
status = spi_register_driver(&rf_driver);
if (status)
goto class_destroy_out;
return 0;
class_destroy_out:
class_destroy(rf_class);
cdev_del_out:
cdev_del(&rf_cdev);
unregister_chrdev_region_out:
unregister_chrdev_region(rf_devt, N_SPI_MINORS);
return status;
}
static void __exit rf_exit(void)
{
_DEBUG("");
spi_unregister_driver(&rf_driver);
class_destroy(rf_class);
cdev_del(&rf_cdev);
unregister_chrdev_region(rf_devt, N_SPI_MINORS);
}
module_init(rf_init);
module_exit(rf_exit);
MODULE_AUTHOR("Daniel Hilst Selli <danielhilst@gmail.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("nRF24L01+ Driver");