/*
* drivers/media/radio/si4713-i2c.c
*
* Silicon Labs Si4713 FM Radio Transmitter I2C commands.
*
* Copyright (c) 2009 Nokia Corporation
* Contact: Eduardo Valentin <eduardo.valentin@nokia.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/regulator/consumer.h>
#include <linux/module.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-common.h>
#include "si4713-i2c.h"
/* module parameters */
static int debug;
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug level (0 - 2)");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Eduardo Valentin <eduardo.valentin@nokia.com>");
MODULE_DESCRIPTION("I2C driver for Si4713 FM Radio Transmitter");
MODULE_VERSION("0.0.1");
static const char *si4713_supply_names[SI4713_NUM_SUPPLIES] = {
"vio",
"vdd",
};
#define DEFAULT_RDS_PI 0x00
#define DEFAULT_RDS_PTY 0x00
#define DEFAULT_RDS_DEVIATION 0x00C8
#define DEFAULT_RDS_PS_REPEAT_COUNT 0x0003
#define DEFAULT_LIMITER_RTIME 0x1392
#define DEFAULT_LIMITER_DEV 0x102CA
#define DEFAULT_PILOT_FREQUENCY 0x4A38
#define DEFAULT_PILOT_DEVIATION 0x1A5E
#define DEFAULT_ACOMP_ATIME 0x0000
#define DEFAULT_ACOMP_RTIME 0xF4240L
#define DEFAULT_ACOMP_GAIN 0x0F
#define DEFAULT_ACOMP_THRESHOLD (-0x28)
#define DEFAULT_MUTE 0x01
#define DEFAULT_POWER_LEVEL 88
#define DEFAULT_FREQUENCY 8800
#define DEFAULT_PREEMPHASIS FMPE_EU
#define DEFAULT_TUNE_RNL 0xFF
#define to_si4713_device(sd) container_of(sd, struct si4713_device, sd)
/* frequency domain transformation (using times 10 to avoid floats) */
#define FREQDEV_UNIT 100000
#define FREQV4L2_MULTI 625
#define si4713_to_v4l2(f) ((f * FREQDEV_UNIT) / FREQV4L2_MULTI)
#define v4l2_to_si4713(f) ((f * FREQV4L2_MULTI) / FREQDEV_UNIT)
#define FREQ_RANGE_LOW 7600
#define FREQ_RANGE_HIGH 10800
#define MAX_ARGS 7
#define RDS_BLOCK 8
#define RDS_BLOCK_CLEAR 0x03
#define RDS_BLOCK_LOAD 0x04
#define RDS_RADIOTEXT_2A 0x20
#define RDS_RADIOTEXT_BLK_SIZE 4
#define RDS_RADIOTEXT_INDEX_MAX 0x0F
#define RDS_CARRIAGE_RETURN 0x0D
#define rds_ps_nblocks(len) ((len / RDS_BLOCK) + (len % RDS_BLOCK ? 1 : 0))
#define get_status_bit(p, b, m) (((p) & (m)) >> (b))
#define set_bits(p, v, b, m) (((p) & ~(m)) | ((v) << (b)))
#define ATTACK_TIME_UNIT 500
#define POWER_OFF 0x00
#define POWER_ON 0x01
#define msb(x) ((u8)((u16) x >> 8))
#define lsb(x) ((u8)((u16) x & 0x00FF))
#define compose_u16(msb, lsb) (((u16)msb << 8) | lsb)
#define check_command_failed(status) (!(status & SI4713_CTS) || \
(status & SI4713_ERR))
/* mute definition */
#define set_mute(p) ((p & 1) | ((p & 1) << 1));
#ifdef DEBUG
#define DBG_BUFFER(device, message, buffer, size) \
{ \
int i; \
char str[(size)*5]; \
for (i = 0; i < size; i++) \
sprintf(str + i * 5, " 0x%02x", buffer[i]); \
v4l2_dbg(2, debug, device, "%s:%s\n", message, str); \
}
#else
#define DBG_BUFFER(device, message, buffer, size)
#endif
/*
* Values for limiter release time (sorted by second column)
* device release
* value time (us)
*/
static long limiter_times[] = {
2000, 250,
1000, 500,
510, 1000,
255, 2000,
170, 3000,
127, 4020,
102, 5010,
85, 6020,
73, 7010,
64, 7990,
57, 8970,
51, 10030,
25, 20470,
17, 30110,
13, 39380,
10, 51190,
8, 63690,
7, 73140,
6, 85330,
5, 102390,
};
/*
* Values for audio compression release time (sorted by second column)
* device release
* value time (us)
*/
static unsigned long acomp_rtimes[] = {
0, 100000,
1, 200000,
2, 350000,
3, 525000,
4, 1000000,
};
/*
* Values for preemphasis (sorted by second column)
* device preemphasis
* value value (v4l2)
*/
static unsigned long preemphasis_values[] = {
FMPE_DISABLED, V4L2_PREEMPHASIS_DISABLED,
FMPE_EU, V4L2_PREEMPHASIS_50_uS,
FMPE_USA, V4L2_PREEMPHASIS_75_uS,
};
static int usecs_to_dev(unsigned long usecs, unsigned long const array[],
int size)
{
int i;
int rval = -EINVAL;
for (i = 0; i < size / 2; i++)
if (array[(i * 2) + 1] >= usecs) {
rval = array[i * 2];
break;
}
return rval;
}
/* si4713_handler: IRQ handler, just complete work */
static irqreturn_t si4713_handler(int irq, void *dev)
{
struct si4713_device *sdev = dev;
v4l2_dbg(2, debug, &sdev->sd,
"%s: sending signal to completion work.\n", __func__);
complete(&sdev->work);
return IRQ_HANDLED;
}
/*
* si4713_send_command - sends a command to si4713 and waits its response
* @sdev: si4713_device structure for the device we are communicating
* @command: command id
* @args: command arguments we are sending (up to 7)
* @argn: actual size of @args
* @response: buffer to place the expected response from the device (up to 15)
* @respn: actual size of @response
* @usecs: amount of time to wait before reading the response (in usecs)
*/
static int si4713_send_command(struct si4713_device *sdev, const u8 command,
const u8 args[], const int argn,
u8 response[], const int respn, const int usecs)
{
struct i2c_client *client = v4l2_get_subdevdata(&sdev->sd);
u8 data1[MAX_ARGS + 1];
int err;
if (!client->adapter)
return -ENODEV;
/* First send the command and its arguments */
data1[0] = command;
memcpy(data1 + 1, args, argn);
DBG_BUFFER(&sdev->sd, "Parameters", data1, argn + 1);
err = i2c_master_send(client, data1, argn + 1);
if (err != argn + 1) {
v4l2_err(&sdev->sd, "Error while sending command 0x%02x\n",
command);
return (err > 0) ? -EIO : err;
}
/* Wait response from interrupt */
if (!wait_for_completion_timeout(&sdev->work,
usecs_to_jiffies(usecs) + 1))
v4l2_warn(&sdev->sd,
"(%s) Device took too much time to answer.\n",
__func__);
/* Then get the response */
err = i2c_master_recv(client, response, respn);
if (err != respn) {
v4l2_err(&sdev->sd,
"Error while reading response for command 0x%02x\n",
command);
return (err > 0) ? -EIO : err;
}
DBG_BUFFER(&sdev->sd, "Response", response, respn);
if (check_command_failed(response[0]))
return -EBUSY;
return 0;
}
/*
* si4713_read_property - reads a si4713 property
* @sdev: si4713_device structure for the device we are communicating
* @prop: property identification number
* @pv: property value to be returned on success
*/
static int si4713_read_property(struct si4713_device *sdev, u16 prop, u32 *pv)
{
int err;
u8 val[SI4713_GET_PROP_NRESP];
/*
* .First byte = 0
* .Second byte = property's MSB
* .Third byte = property's LSB
*/
const u8 args[SI4713_GET_PROP_NARGS] = {
0x00,
msb(prop),
lsb(prop),
};
err = si4713_send_command(sdev, SI4713_CMD_GET_PROPERTY,
args, ARRAY_SIZE(args), val,
ARRAY_SIZE(val), DEFAULT_TIMEOUT);
if (err < 0)
return err;
*pv = compose_u16(val[2], val[3]);
v4l2_dbg(1, debug, &sdev->sd,
"%s: property=0x%02x value=0x%02x status=0x%02x\n",
__func__, prop, *pv, val[0]);
return err;
}
/*
* si4713_write_property - modifies a si4713 property
* @sdev: si4713_device structure for the device we are communicating
* @prop: property identification number
* @val: new value for that property
*/
static int si4713_write_property(struct si4713_device *sdev, u16 prop, u16 val)
{
int rval;
u8 resp[SI4713_SET_PROP_NRESP];
/*
* .First byte = 0
* .Second byte = property's MSB
* .Third byte = property's LSB
* .Fourth byte = value's MSB
* .Fifth byte = value's LSB
*/
const u8 args[SI4713_SET_PROP_NARGS] = {
0x00,
msb(prop),
lsb(prop),
msb(val),
lsb(val),
};
rval = si4713_send_command(sdev, SI4713_CMD_SET_PROPERTY,
args, ARRAY_SIZE(args),
resp, ARRAY_SIZE(resp),
DEFAULT_TIMEOUT);
if (rval < 0)
return rval;
v4l2_dbg(1, debug, &sdev->sd,
"%s: property=0x%02x value=0x%02x status=0x%02x\n",
__func__, prop, val, resp[0]);
/*
* As there is no command response for SET_PROPERTY,
* wait Tcomp time to finish before proceed, in order
* to have property properly set.
*/
msleep(TIMEOUT_SET_PROPERTY);
return rval;
}
/*
* si4713_powerup - Powers the device up
* @sdev: si4713_device structure for the device we are communicating
*/
static int si4713_powerup(struct si4713_device *sdev)
{
int err;
u8 resp[SI4713_PWUP_NRESP];
/*
* .First byte = Enabled interrupts and boot function
* .Second byte = Input operation mode
*/
const u8 args[SI4713_PWUP_NARGS] = {
SI4713_PWUP_CTSIEN | SI4713_PWUP_GPO2OEN | SI4713_PWUP_FUNC_TX,
SI4713_PWUP_OPMOD_ANALOG,
};
if (sdev->power_state)
return 0;
err = regulator_bulk_enable(ARRAY_SIZE(sdev->supplies),
sdev->supplies);
if (err) {
v4l2_err(&sdev->sd, "Failed to enable supplies: %d\n", err);
return err;
}
if (gpio_is_valid(sdev->gpio_reset)) {
udelay(50);
gpio_set_value(sdev->gpio_reset, 1);
}
err = si4713_send_command(sdev, SI4713_CMD_POWER_UP,
args, ARRAY_SIZE(args),
resp, ARRAY_SIZE(resp),
TIMEOUT_POWER_UP);
if (!err) {
v4l2_dbg(1, debug, &sdev->sd, "Powerup response: 0x%02x\n",
resp[0]);
v4l2_dbg(1, debug, &sdev->sd, "Device in power up mode\n");
sdev->power_state = POWER_ON;
err = si4713_write_property(sdev, SI4713_GPO_IEN,
SI4713_STC_INT | SI4713_CTS);
} else {
if (gpio_is_valid(sdev->gpio_reset))
gpio_set_value(sdev->gpio_reset, 0);
err = regulator_bulk_disable(ARRAY_SIZE(sdev->supplies),
sdev->supplies);
if (err)
v4l2_err(&sdev->sd,
"Failed to disable supplies: %d\n", err);
}
return err;
}
/*
* si4713_powerdown - Powers the device down
* @sdev: si4713_device structure for the device we are communicating
*/
static int si4713_powerdown(struct si4713_device *sdev)
{
int err;
u8 resp[SI4713_PWDN_NRESP];
if (!sdev->power_state)
return 0;
err = si4713_send_command(sdev, SI4713_CMD_POWER_DOWN,
NULL, 0,
resp, ARRAY_SIZE(resp),
DEFAULT_TIMEOUT);
if (!err) {
v4l2_dbg(1, debug, &sdev->sd, "Power down response: 0x%02x\n",
resp[0]);
v4l2_dbg(1, debug, &sdev->sd, "Device in reset mode\n");
if (gpio_is_valid(sdev->gpio_reset))
gpio_set_value(sdev->gpio_reset, 0);
err = regulator_bulk_disable(ARRAY_SIZE(sdev->supplies),
sdev->supplies);
if (err)
v4l2_err(&sdev->sd,
"Failed to disable supplies: %d\n", err);
sdev->power_state = POWER_OFF;
}
return err;
}
/*
* si4713_checkrev - Checks if we are treating a device with the correct rev.
* @sdev: si4713_device structure for the device we are communicating
*/
static int si4713_checkrev(struct si4713_device *sdev)
{
struct i2c_client *client = v4l2_get_subdevdata(&sdev->sd);
int rval;
u8 resp[SI4713_GETREV_NRESP];
rval = si4713_send_command(sdev, SI4713_CMD_GET_REV,
NULL, 0,
resp, ARRAY_SIZE(resp),
DEFAULT_TIMEOUT);
if (rval < 0)
return rval;
if (resp[1] == SI4713_PRODUCT_NUMBER) {
v4l2_info(&sdev->sd, "chip found @ 0x%02x (%s)\n",
client->addr << 1, client->adapter->name);
} else {
v4l2_err(&sdev->sd, "Invalid product number\n");
rval = -EINVAL;
}
return rval;
}
/*
* si4713_wait_stc - Waits STC interrupt and clears status bits. Useful
* for TX_TUNE_POWER, TX_TUNE_FREQ and TX_TUNE_MEAS
* @sdev: si4713_device structure for the device we are communicating
* @usecs: timeout to wait for STC interrupt signal
*/
static int si4713_wait_stc(struct si4713_device *sdev, const int usecs)
{
int err;
u8 resp[SI4713_GET_STATUS_NRESP];
/* Wait response from STC interrupt */
if (!wait_for_completion_timeout(&sdev->work,
usecs_to_jiffies(usecs) + 1))
v4l2_warn(&sdev->sd,
"%s: device took too much time to answer (%d usec).\n",
__func__, usecs);
/* Clear status bits */
err = si4713_send_command(sdev, SI4713_CMD_GET_INT_STATUS,
NULL, 0,
resp, ARRAY_SIZE(resp),
DEFAULT_TIMEOUT);
if (err < 0)
goto exit;
v4l2_dbg(1, debug, &sdev->sd,
"%s: status bits: 0x%02x\n", __func__, resp[0]);
if (!(resp[0] & SI4713_STC_INT))
err = -EIO;
exit:
return err;
}
/*
* si4713_tx_tune_freq - Sets the state of the RF carrier and sets the tuning
* frequency between 76 and 108 MHz in 10 kHz units and
* steps of 50 kHz.
* @sdev: si4713_device structure for the device we are communicating
* @frequency: desired frequency (76 - 108 MHz, unit 10 KHz, step 50 kHz)
*/
static int si4713_tx_tune_freq(struct si4713_device *sdev, u16 frequency)
{
int err;
u8 val[SI4713_TXFREQ_NRESP];
/*
* .First byte = 0
* .Second byte = frequency's MSB
* .Third byte = frequency's LSB
*/
const u8 args[SI4713_TXFREQ_NARGS] = {
0x00,
msb(frequency),
lsb(frequency),
};
err = si4713_send_command(sdev, SI4713_CMD_TX_TUNE_FREQ,
args, ARRAY_SIZE(args), val,
ARRAY_SIZE(val), DEFAULT_TIMEOUT);
if (err < 0)
return err;
v4l2_dbg(1, debug, &sdev->sd,
"%s: frequency=0x%02x status=0x%02x\n", __func__,
frequency, val[0]);
err = si4713_wait_stc(sdev, TIMEOUT_TX_TUNE);
if (err < 0)
return err;
return compose_u16(args[1], args[2]);
}
/*
* si4713_tx_tune_power - Sets the RF voltage level between 88 and 115 dBuV in
* 1 dB units. A value of 0x00 indicates off. The command
* also sets the antenna tuning capacitance. A value of 0
* indicates autotuning, and a value of 1 - 191 indicates
* a manual override, which results in a tuning
* capacitance of 0.25 pF x @antcap.
* @sdev: si4713_device structure for the device we are communicating
* @power: tuning power (88 - 115 dBuV, unit/step 1 dB)
* @antcap: value of antenna tuning capacitor (0 - 191)
*/
static int si4713_tx_tune_power(struct si4713_device *sdev, u8 power,
u8 antcap)
{
int err;
u8 val[SI4713_TXPWR_NRESP];
/*
* .First byte = 0
* .Second byte = 0
* .Third byte = power
* .Fourth byte = antcap
*/
const u8 args[SI4713_TXPWR_NARGS] = {
0x00,
0x00,
power,
antcap,
};
if (((power > 0) && (power < SI4713_MIN_POWER)) ||
power > SI4713_MAX_POWER || antcap > SI4713_MAX_ANTCAP)
return -EDOM;
err = si4713_send_command(sdev, SI4713_CMD_TX_TUNE_POWER,
args, ARRAY_SIZE(args), val,
ARRAY_SIZE(val), DEFAULT_TIMEOUT);
if (err < 0)
return err;
v4l2_dbg(1, debug, &sdev->sd,
"%s: power=0x%02x antcap=0x%02x status=0x%02x\n",
__func__, power, antcap, val[0]);
return si4713_wait_stc(sdev, TIMEOUT_TX_TUNE_POWER);
}
/*
* si4713_tx_tune_measure - Enters receive mode and measures the received noise
* level in units of dBuV on the selected frequency.
* The Frequency must be between 76 and 108 MHz in 10 kHz
* units and steps of 50 kHz. The command also sets the
* antenna tuning capacitance. A value of 0 means
* autotuning, and a value of 1 to 191 indicates manual
* override.
* @sdev: si4713_device structure for the device we are communicating
* @frequency: desired frequency (76 - 108 MHz, unit 10 KHz, step 50 kHz)
* @antcap: value of antenna tuning capacitor (0 - 191)
*/
static int si4713_tx_tune_measure(struct si4713_device *sdev, u16 frequency,
u8 antcap)
{
int err;
u8 val[SI4713_TXMEA_NRESP];
/*
* .First byte = 0
* .Second byte = frequency's MSB
* .Third byte = frequency's LSB
* .Fourth byte = antcap
*/
const u8 args[SI4713_TXMEA_NARGS] = {
0x00,
msb(frequency),
lsb(frequency),
antcap,
};
sdev->tune_rnl = DEFAULT_TUNE_RNL;
if (antcap > SI4713_MAX_ANTCAP)
return -EDOM;
err = si4713_send_command(sdev, SI4713_CMD_TX_TUNE_MEASURE,
args, ARRAY_SIZE(args), val,
ARRAY_SIZE(val), DEFAULT_TIMEOUT);
if (err < 0)
return err;
v4l2_dbg(1, debug, &sdev->sd,
"%s: frequency=0x%02x antcap=0x%02x status=0x%02x\n",
__func__, frequency, antcap, val[0]);
return si4713_wait_stc(sdev, TIMEOUT_TX_TUNE);
}
/*
* si4713_tx_tune_status- Returns the status of the tx_tune_freq, tx_tune_mea or
* tx_tune_power commands. This command return the current
* frequency, output voltage in dBuV, the antenna tunning
* capacitance value and the received noise level. The
* command also clears the stcint interrupt bit when the
* first bit of its arguments is high.
* @sdev: si4713_device structure for the device we are communicating
* @intack: 0x01 to clear the seek/tune complete interrupt status indicator.
* @frequency: returned frequency
* @power: returned power
* @antcap: returned antenna capacitance
* @noise: returned noise level
*/
static int si4713_tx_tune_status(struct si4713_device *sdev, u8 intack,
u16 *frequency, u8 *power,
u8 *antcap, u8 *noise)
{
int err;
u8 val[SI4713_TXSTATUS_NRESP];
/*
* .First byte = intack bit
*/
const u8 args[SI4713_TXSTATUS_NARGS] = {
intack & SI4713_INTACK_MASK,
};
err = si4713_send_command(sdev, SI4713_CMD_TX_TUNE_STATUS,
args, ARRAY_SIZE(args), val,
ARRAY_SIZE(val), DEFAULT_TIMEOUT);
if (!err) {
v4l2_dbg(1, debug, &sdev->sd,
"%s: status=0x%02x\n", __func__, val[0]);
*frequency = compose_u16(val[2], val[3]);
sdev->frequency = *frequency;
*power = val[5];
*antcap = val[6];
*noise = val[7];
v4l2_dbg(1, debug, &sdev->sd, "%s: response: %d x 10 kHz "
"(power %d, antcap %d, rnl %d)\n", __func__,
*frequency, *power, *antcap, *noise);
}
return err;
}
/*
* si4713_tx_rds_buff - Loads the RDS group buffer FIFO or circular buffer.
* @sdev: si4713_device structure for the device we are communicating
* @mode: the buffer operation mode.
* @rdsb: RDS Block B
* @rdsc: RDS Block C
* @rdsd: RDS Block D
* @cbleft: returns the number of available circular buffer blocks minus the
* number of used circular buffer blocks.
*/
static int si4713_tx_rds_buff(struct si4713_device *sdev, u8 mode, u16 rdsb,
u16 rdsc, u16 rdsd, s8 *cbleft)
{
int err;
u8 val[SI4713_RDSBUFF_NRESP];
const u8 args[SI4713_RDSBUFF_NARGS] = {
mode & SI4713_RDSBUFF_MODE_MASK,
msb(rdsb),
lsb(rdsb),
msb(rdsc),
lsb(rdsc),
msb(rdsd),
lsb(rdsd),
};
err = si4713_send_command(sdev, SI4713_CMD_TX_RDS_BUFF,
args, ARRAY_SIZE(args), val,
ARRAY_SIZE(val), DEFAULT_TIMEOUT);
if (!err) {
v4l2_dbg(1, debug, &sdev->sd,
"%s: status=0x%02x\n", __func__, val[0]);
*cbleft = (s8)val[2] - val[3];
v4l2_dbg(1, debug, &sdev->sd, "%s: response: interrupts"
" 0x%02x cb avail: %d cb used %d fifo avail"
" %d fifo used %d\n", __func__, val[1],
val[2], val[3], val[4], val[5]);
}
return err;
}
/*
* si4713_tx_rds_ps - Loads the program service buffer.
* @sdev: si4713_device structure for the device we are communicating
* @psid: program service id to be loaded.
* @pschar: assumed 4 size char array to be loaded into the program service
*/
static int si4713_tx_rds_ps(struct si4713_device *sdev, u8 psid,
unsigned char *pschar)
{
int err;
u8 val[SI4713_RDSPS_NRESP];
const u8 args[SI4713_RDSPS_NARGS] = {
psid & SI4713_RDSPS_PSID_MASK,
pschar[0],
pschar[1],
pschar[2],
pschar[3],
};
err = si4713_send_command(sdev, SI4713_CMD_TX_RDS_PS,
args, ARRAY_SIZE(args), val,
ARRAY_SIZE(val), DEFAULT_TIMEOUT);
if (err < 0)
return err;
v4l2_dbg(1, debug, &sdev->sd, "%s: status=0x%02x\n", __func__, val[0]);
return err;
}
static int si4713_set_power_state(struct si4713_device *sdev, u8 value)
{
if (value)
return si4713_powerup(sdev);
return si4713_powerdown(sdev);
}
static int si4713_set_mute(struct si4713_device *sdev, u16 mute)
{
int rval = 0;
mute = set_mute(mute);
if (sdev->power_state)
rval = si4713_write_property(sdev,
SI4713_TX_LINE_INPUT_MUTE, mute);
return rval;
}
static int si4713_set_rds_ps_name(struct si4713_device *sdev, char *ps_name)
{
int rval = 0, i;
u8 len = 0;
/* We want to clear the whole thing */
if (!strlen(ps_name))
memset(ps_name, 0, MAX_RDS_PS_NAME + 1);
if (sdev->power_state) {
/* Write the new ps name and clear the padding */
for (i = 0; i < MAX_RDS_PS_NAME; i += (RDS_BLOCK / 2)) {
rval = si4713_tx_rds_ps(sdev, (i / (RDS_BLOCK / 2)),
ps_name + i);
if (rval < 0)
return rval;
}
/* Setup the size to be sent */
if (strlen(ps_name))
len = strlen(ps_name) - 1;
else
len = 1;
rval = si4713_write_property(sdev,
SI4713_TX_RDS_PS_MESSAGE_COUNT,
rds_ps_nblocks(len));
if (rval < 0)
return rval;
rval = si4713_write_property(sdev,
SI4713_TX_RDS_PS_REPEAT_COUNT,
DEFAULT_RDS_PS_REPEAT_COUNT * 2);
if (rval < 0)
return rval;
}
return rval;
}
static int si4713_set_rds_radio_text(struct si4713_device *sdev, char *rt)
{
int rval = 0, i;
u16 t_index = 0;
u8 b_index = 0, cr_inserted = 0;
s8 left;
if (!sdev->power_state)
return rval;
rval = si4713_tx_rds_buff(sdev, RDS_BLOCK_CLEAR, 0, 0, 0, &left);
if (rval < 0)
return rval;
if (!strlen(rt))
return rval;
do {
/* RDS spec says that if the last block isn't used,
* then apply a carriage return
*/
if (t_index < (RDS_RADIOTEXT_INDEX_MAX * RDS_RADIOTEXT_BLK_SIZE)) {
for (i = 0; i < RDS_RADIOTEXT_BLK_SIZE; i++) {
if (!rt[t_index + i] ||
rt[t_index + i] == RDS_CARRIAGE_RETURN) {
rt[t_index + i] = RDS_CARRIAGE_RETURN;
cr_inserted = 1;
break;
}
}
}
rval = si4713_tx_rds_buff(sdev, RDS_BLOCK_LOAD,
compose_u16(RDS_RADIOTEXT_2A, b_index++),
compose_u16(rt[t_index], rt[t_index + 1]),
compose_u16(rt[t_index + 2], rt[t_index + 3]),
&left);
if (rval < 0)
return rval;
t_index += RDS_RADIOTEXT_BLK_SIZE;
if (cr_inserted)
break;
} while (left > 0);
return rval;
}
/*
* si4713_update_tune_status - update properties from tx_tune_status
* command. Must be called with sdev->mutex held.
* @sdev: si4713_device structure for the device we are communicating
*/
static int si4713_update_tune_status(struct si4713_device *sdev)
{
int rval;
u16 f = 0;
u8 p = 0, a = 0, n = 0;
rval = si4713_tx_tune_status(sdev, 0x00, &f, &p, &a, &n);
if (rval < 0)
goto exit;
/* TODO: check that power_level and antenna_capacitor really are not
changed by the hardware. If they are, then these controls should become
volatiles.
sdev->power_level = p;
sdev->antenna_capacitor = a;*/
sdev->tune_rnl = n;
exit:
return rval;
}
static int si4713_choose_econtrol_action(struct si4713_device *sdev, u32 id,
s32 *bit, s32 *mask, u16 *property, int *mul,
unsigned long **table, int *size)
{
s32 rval = 0;
switch (id) {
/* FM_TX class controls */
case V4L2_CID_RDS_TX_PI:
*property = SI4713_TX_RDS_PI;
*mul = 1;
break;
case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
*property = SI4713_TX_ACOMP_THRESHOLD;
*mul = 1;
break;
case V4L2_CID_AUDIO_COMPRESSION_GAIN:
*property = SI4713_TX_ACOMP_GAIN;
*mul = 1;
break;
case V4L2_CID_PILOT_TONE_FREQUENCY:
*property = SI4713_TX_PILOT_FREQUENCY;
*mul = 1;
break;
case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
*property = SI4713_TX_ACOMP_ATTACK_TIME;
*mul = ATTACK_TIME_UNIT;
break;
case V4L2_CID_PILOT_TONE_DEVIATION:
*property = SI4713_TX_PILOT_DEVIATION;
*mul = 10;
break;
case V4L2_CID_AUDIO_LIMITER_DEVIATION:
*property = SI4713_TX_AUDIO_DEVIATION;
*mul = 10;
break;
case V4L2_CID_RDS_TX_DEVIATION:
*property = SI4713_TX_RDS_DEVIATION;
*mul = 1;
break;
case V4L2_CID_RDS_TX_PTY:
*property = SI4713_TX_RDS_PS_MISC;
*bit = 5;
*mask = 0x1F << 5;
break;
case V4L2_CID_AUDIO_LIMITER_ENABLED:
*property = SI4713_TX_ACOMP_ENABLE;
*bit = 1;
*mask = 1 << 1;
break;
case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
*property = SI4713_TX_ACOMP_ENABLE;
*bit = 0;
*mask = 1 << 0;
break;
case V4L2_CID_PILOT_TONE_ENABLED:
*property = SI4713_TX_COMPONENT_ENABLE;
*bit = 0;
*mask = 1 << 0;
break;
case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
*property = SI4713_TX_LIMITER_RELEASE_TIME;
*table = limiter_times;
*size = ARRAY_SIZE(limiter_times);
break;
case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
*property = SI4713_TX_ACOMP_RELEASE_TIME;
*table = acomp_rtimes;
*size = ARRAY_SIZE(acomp_rtimes);
break;
case V4L2_CID_TUNE_PREEMPHASIS:
*property = SI4713_TX_PREEMPHASIS;
*table = preemphasis_values;
*size = ARRAY_SIZE(preemphasis_values);
break;
default:
rval = -EINVAL;
break;
}
return rval;
}
static int si4713_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequency *f);
static int si4713_s_modulator(struct v4l2_subdev *sd, const struct v4l2_modulator *);
/*
* si4713_setup - Sets the device up with current configuration.
* @sdev: si4713_device structure for the device we are communicating
*/
static int si4713_setup(struct si4713_device *sdev)
{
struct v4l2_frequency f;
struct v4l2_modulator vm;
int rval;
/* Device procedure needs to set frequency first */
f.tuner = 0;
f.frequency = sdev->frequency ? sdev->frequency : DEFAULT_FREQUENCY;
f.frequency = si4713_to_v4l2(f.frequency);
rval = si4713_s_frequency(&sdev->sd, &f);
vm.index = 0;
if (sdev->stereo)
vm.txsubchans = V4L2_TUNER_SUB_STEREO;
else
vm.txsubchans = V4L2_TUNER_SUB_MONO;
if (sdev->rds_enabled)
vm.txsubchans |= V4L2_TUNER_SUB_RDS;
si4713_s_modulator(&sdev->sd, &vm);
return rval;
}
/*
* si4713_initialize - Sets the device up with default configuration.
* @sdev: si4713_device structure for the device we are communicating
*/
static int si4713_initialize(struct si4713_device *sdev)
{
int rval;
rval = si4713_set_power_state(sdev, POWER_ON);
if (rval < 0)
return rval;
rval = si4713_checkrev(sdev);
if (rval < 0)
return rval;
rval = si4713_set_power_state(sdev, POWER_OFF);
if (rval < 0)
return rval;
sdev->frequency = DEFAULT_FREQUENCY;
sdev->stereo = 1;
sdev->tune_rnl = DEFAULT_TUNE_RNL;
return 0;
}
/* si4713_s_ctrl - set the value of a control */
static int si4713_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct si4713_device *sdev =
container_of(ctrl->handler, struct si4713_device, ctrl_handler);
u32 val = 0;
s32 bit = 0, mask = 0;
u16 property = 0;
int mul = 0;
unsigned long *table = NULL;
int size = 0;
bool force = false;
int c;
int ret = 0;
if (ctrl->id != V4L2_CID_AUDIO_MUTE)
return -EINVAL;
if (ctrl->is_new) {
if (ctrl->val) {
ret = si4713_set_mute(sdev, ctrl->val);
if (!ret)
ret = si4713_set_power_state(sdev, POWER_DOWN);
return ret;
}
ret = si4713_set_power_state(sdev, POWER_UP);
if (!ret)
ret = si4713_set_mute(sdev, ctrl->val);
if (!ret)
ret = si4713_setup(sdev);
if (ret)
return ret;
force = true;
}
if (!sdev->power_state)
return 0;
for (c = 1; !ret && c < ctrl->ncontrols; c++) {
ctrl = ctrl->cluster[c];
if (!force && !ctrl->is_new)
continue;
switch (ctrl->id) {
case V4L2_CID_RDS_TX_PS_NAME:
ret = si4713_set_rds_ps_name(sdev, ctrl->string);
break;
case V4L2_CID_RDS_TX_RADIO_TEXT:
ret = si4713_set_rds_radio_text(sdev, ctrl->string);
break;
case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
/* don't handle this control if we force setting all
* controls since in that case it will be handled by
* V4L2_CID_TUNE_POWER_LEVEL. */
if (force)
break;
/* fall through */
case V4L2_CID_TUNE_POWER_LEVEL:
ret = si4713_tx_tune_power(sdev,
sdev->tune_pwr_level->val, sdev->tune_ant_cap->val);
if (!ret) {
/* Make sure we don't set this twice */
sdev->tune_ant_cap->is_new = false;
sdev->tune_pwr_level->is_new = false;
}
break;
default:
ret = si4713_choose_econtrol_action(sdev, ctrl->id, &bit,
&mask, &property, &mul, &table, &size);
if (ret < 0)
break;
val = ctrl->val;
if (mul) {
val = val / mul;
} else if (table) {
ret = usecs_to_dev(val, table, size);
if (ret < 0)
break;
val = ret;
ret = 0;
}
if (mask) {
ret = si4713_read_property(sdev, property, &val);
if (ret < 0)
break;
val = set_bits(val, ctrl->val, bit, mask);
}
ret = si4713_write_property(sdev, property, val);
if (ret < 0)
break;
if (mask)
val = ctrl->val;
break;
}
}
return ret;
}
/* si4713_ioctl - deal with private ioctls (only rnl for now) */
static long si4713_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
{
struct si4713_device *sdev = to_si4713_device(sd);
struct si4713_rnl *rnl = arg;
u16 frequency;
int rval = 0;
if (!arg)
return -EINVAL;
switch (cmd) {
case SI4713_IOC_MEASURE_RNL:
frequency = v4l2_to_si4713(rnl->frequency);
if (sdev->power_state) {
/* Set desired measurement frequency */
rval = si4713_tx_tune_measure(sdev, frequency, 0);
if (rval < 0)
return rval;
/* get results from tune status */
rval = si4713_update_tune_status(sdev);
if (rval < 0)
return rval;
}
rnl->rnl = sdev->tune_rnl;
break;
default:
/* nothing */
rval = -ENOIOCTLCMD;
}
return rval;
}
/* si4713_g_modulator - get modulator attributes */
static int si4713_g_modulator(struct v4l2_subdev *sd, struct v4l2_modulator *vm)
{
struct si4713_device *sdev = to_si4713_device(sd);
int rval = 0;
if (!sdev)
return -ENODEV;
if (vm->index > 0)
return -EINVAL;
strncpy(vm->name, "FM Modulator", 32);
vm->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW |
V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_CONTROLS;
/* Report current frequency range limits */
vm->rangelow = si4713_to_v4l2(FREQ_RANGE_LOW);
vm->rangehigh = si4713_to_v4l2(FREQ_RANGE_HIGH);
if (sdev->power_state) {
u32 comp_en = 0;
rval = si4713_read_property(sdev, SI4713_TX_COMPONENT_ENABLE,
&comp_en);
if (rval < 0)
return rval;
sdev->stereo = get_status_bit(comp_en, 1, 1 << 1);
}
/* Report current audio mode: mono or stereo */
if (sdev->stereo)
vm->txsubchans = V4L2_TUNER_SUB_STEREO;
else
vm->txsubchans = V4L2_TUNER_SUB_MONO;
/* Report rds feature status */
if (sdev->rds_enabled)
vm->txsubchans |= V4L2_TUNER_SUB_RDS;
else
vm->txsubchans &= ~V4L2_TUNER_SUB_RDS;
return rval;
}
/* si4713_s_modulator - set modulator attributes */
static int si4713_s_modulator(struct v4l2_subdev *sd, const struct v4l2_modulator *vm)
{
struct si4713_device *sdev = to_si4713_device(sd);
int rval = 0;
u16 stereo, rds;
u32 p;
if (!sdev)
return -ENODEV;
if (vm->index > 0)
return -EINVAL;
/* Set audio mode: mono or stereo */
if (vm->txsubchans & V4L2_TUNER_SUB_STEREO)
stereo = 1;
else if (vm->txsubchans & V4L2_TUNER_SUB_MONO)
stereo = 0;
else
return -EINVAL;
rds = !!(vm->txsubchans & V4L2_TUNER_SUB_RDS);
if (sdev->power_state) {
rval = si4713_read_property(sdev,
SI4713_TX_COMPONENT_ENABLE, &p);
if (rval < 0)
return rval;
p = set_bits(p, stereo, 1, 1 << 1);
p = set_bits(p, rds, 2, 1 << 2);
rval = si4713_write_property(sdev,
SI4713_TX_COMPONENT_ENABLE, p);
if (rval < 0)
return rval;
}
sdev->stereo = stereo;
sdev->rds_enabled = rds;
return rval;
}
/* si4713_g_frequency - get tuner or modulator radio frequency */
static int si4713_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
{
struct si4713_device *sdev = to_si4713_device(sd);
int rval = 0;
if (f->tuner)
return -EINVAL;
if (sdev->power_state) {
u16 freq;
u8 p, a, n;
rval = si4713_tx_tune_status(sdev, 0x00, &freq, &p, &a, &n);
if (rval < 0)
return rval;
sdev->frequency = freq;
}
f->frequency = si4713_to_v4l2(sdev->frequency);
return rval;
}
/* si4713_s_frequency - set tuner or modulator radio frequency */
static int si4713_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequency *f)
{
struct si4713_device *sdev = to_si4713_device(sd);
int rval = 0;
u16 frequency = v4l2_to_si4713(f->frequency);
if (f->tuner)
return -EINVAL;
/* Check frequency range */
frequency = clamp_t(u16, frequency, FREQ_RANGE_LOW, FREQ_RANGE_HIGH);
if (sdev->power_state) {
rval = si4713_tx_tune_freq(sdev, frequency);
if (rval < 0)
return rval;
frequency = rval;
rval = 0;
}
sdev->frequency = frequency;
return rval;
}
static const struct v4l2_ctrl_ops si4713_ctrl_ops = {
.s_ctrl = si4713_s_ctrl,
};
static const struct v4l2_subdev_core_ops si4713_subdev_core_ops = {
.ioctl = si4713_ioctl,
};
static const struct v4l2_subdev_tuner_ops si4713_subdev_tuner_ops = {
.g_frequency = si4713_g_frequency,
.s_frequency = si4713_s_frequency,
.g_modulator = si4713_g_modulator,
.s_modulator = si4713_s_modulator,
};
static const struct v4l2_subdev_ops si4713_subdev_ops = {
.core = &si4713_subdev_core_ops,
.tuner = &si4713_subdev_tuner_ops,
};
/*
* I2C driver interface
*/
/* si4713_probe - probe for the device */
static int si4713_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct si4713_device *sdev;
struct si4713_platform_data *pdata = client->dev.platform_data;
struct v4l2_ctrl_handler *hdl;
int rval, i;
sdev = kzalloc(sizeof *sdev, GFP_KERNEL);
if (!sdev) {
dev_err(&client->dev, "Failed to alloc video device.\n");
rval = -ENOMEM;
goto exit;
}
sdev->gpio_reset = -1;
if (pdata && gpio_is_valid(pdata->gpio_reset)) {
rval = gpio_request(pdata->gpio_reset, "si4713 reset");
if (rval) {
dev_err(&client->dev,
"Failed to request gpio: %d\n", rval);
goto free_sdev;
}
sdev->gpio_reset = pdata->gpio_reset;
gpio_direction_output(sdev->gpio_reset, 0);
}
for (i = 0; i < ARRAY_SIZE(sdev->supplies); i++)
sdev->supplies[i].supply = si4713_supply_names[i];
rval = regulator_bulk_get(&client->dev, ARRAY_SIZE(sdev->supplies),
sdev->supplies);
if (rval) {
dev_err(&client->dev, "Cannot get regulators: %d\n", rval);
goto free_gpio;
}
v4l2_i2c_subdev_init(&sdev->sd, client, &si4713_subdev_ops);
init_completion(&sdev->work);
hdl = &sdev->ctrl_handler;
v4l2_ctrl_handler_init(hdl, 20);
sdev->mute = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_AUDIO_MUTE, 0, 1, 1, DEFAULT_MUTE);
sdev->rds_pi = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_RDS_TX_PI, 0, 0xffff, 1, DEFAULT_RDS_PI);
sdev->rds_pty = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_RDS_TX_PTY, 0, 31, 1, DEFAULT_RDS_PTY);
sdev->rds_deviation = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_RDS_TX_DEVIATION, 0, MAX_RDS_DEVIATION,
10, DEFAULT_RDS_DEVIATION);
/*
* Report step as 8. From RDS spec, psname
* should be 8. But there are receivers which scroll strings
* sized as 8xN.
*/
sdev->rds_ps_name = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_RDS_TX_PS_NAME, 0, MAX_RDS_PS_NAME, 8, 0);
/*
* Report step as 32 (2A block). From RDS spec,
* radio text should be 32 for 2A block. But there are receivers
* which scroll strings sized as 32xN. Setting default to 32.
*/
sdev->rds_radio_text = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_RDS_TX_RADIO_TEXT, 0, MAX_RDS_RADIO_TEXT, 32, 0);
sdev->limiter_enabled = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_AUDIO_LIMITER_ENABLED, 0, 1, 1, 1);
sdev->limiter_release_time = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_AUDIO_LIMITER_RELEASE_TIME, 250,
MAX_LIMITER_RELEASE_TIME, 10, DEFAULT_LIMITER_RTIME);
sdev->limiter_deviation = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_AUDIO_LIMITER_DEVIATION, 0,
MAX_LIMITER_DEVIATION, 10, DEFAULT_LIMITER_DEV);
sdev->compression_enabled = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_AUDIO_COMPRESSION_ENABLED, 0, 1, 1, 1);
sdev->compression_gain = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_AUDIO_COMPRESSION_GAIN, 0, MAX_ACOMP_GAIN, 1,
DEFAULT_ACOMP_GAIN);
sdev->compression_threshold = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_AUDIO_COMPRESSION_THRESHOLD, MIN_ACOMP_THRESHOLD,
MAX_ACOMP_THRESHOLD, 1,
DEFAULT_ACOMP_THRESHOLD);
sdev->compression_attack_time = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME, 0,
MAX_ACOMP_ATTACK_TIME, 500, DEFAULT_ACOMP_ATIME);
sdev->compression_release_time = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME, 100000,
MAX_ACOMP_RELEASE_TIME, 100000, DEFAULT_ACOMP_RTIME);
sdev->pilot_tone_enabled = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_PILOT_TONE_ENABLED, 0, 1, 1, 1);
sdev->pilot_tone_deviation = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_PILOT_TONE_DEVIATION, 0, MAX_PILOT_DEVIATION,
10, DEFAULT_PILOT_DEVIATION);
sdev->pilot_tone_freq = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_PILOT_TONE_FREQUENCY, 0, MAX_PILOT_FREQUENCY,
1, DEFAULT_PILOT_FREQUENCY);
sdev->tune_preemphasis = v4l2_ctrl_new_std_menu(hdl, &si4713_ctrl_ops,
V4L2_CID_TUNE_PREEMPHASIS,
V4L2_PREEMPHASIS_75_uS, 0, V4L2_PREEMPHASIS_50_uS);
sdev->tune_pwr_level = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_TUNE_POWER_LEVEL, 0, 120, 1, DEFAULT_POWER_LEVEL);
sdev->tune_ant_cap = v4l2_ctrl_new_std(hdl, &si4713_ctrl_ops,
V4L2_CID_TUNE_ANTENNA_CAPACITOR, 0, 191, 1, 0);
if (hdl->error) {
rval = hdl->error;
goto free_ctrls;
}
v4l2_ctrl_cluster(20, &sdev->mute);
sdev->sd.ctrl_handler = hdl;
if (client->irq) {
rval = request_irq(client->irq,
si4713_handler, IRQF_TRIGGER_FALLING | IRQF_DISABLED,
client->name, sdev);
if (rval < 0) {
v4l2_err(&sdev->sd, "Could not request IRQ\n");
goto put_reg;
}
v4l2_dbg(1, debug, &sdev->sd, "IRQ requested.\n");
} else {
v4l2_warn(&sdev->sd, "IRQ not configured. Using timeouts.\n");
}
rval = si4713_initialize(sdev);
if (rval < 0) {
v4l2_err(&sdev->sd, "Failed to probe device information.\n");
goto free_irq;
}
return 0;
free_irq:
if (client->irq)
free_irq(client->irq, sdev);
free_ctrls:
v4l2_ctrl_handler_free(hdl);
put_reg:
regulator_bulk_free(ARRAY_SIZE(sdev->supplies), sdev->supplies);
free_gpio:
if (gpio_is_valid(sdev->gpio_reset))
gpio_free(sdev->gpio_reset);
free_sdev:
kfree(sdev);
exit:
return rval;
}
/* si4713_remove - remove the device */
static int si4713_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
struct si4713_device *sdev = to_si4713_device(sd);
if (sdev->power_state)
si4713_set_power_state(sdev, POWER_DOWN);
if (client->irq > 0)
free_irq(client->irq, sdev);
v4l2_device_unregister_subdev(sd);
v4l2_ctrl_handler_free(sd->ctrl_handler);
regulator_bulk_free(ARRAY_SIZE(sdev->supplies), sdev->supplies);
if (gpio_is_valid(sdev->gpio_reset))
gpio_free(sdev->gpio_reset);
kfree(sdev);
return 0;
}
/* si4713_i2c_driver - i2c driver interface */
static const struct i2c_device_id si4713_id[] = {
{ "si4713" , 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, si4713_id);
static struct i2c_driver si4713_i2c_driver = {
.driver = {
.name = "si4713",
},
.probe = si4713_probe,
.remove = si4713_remove,
.id_table = si4713_id,
};
module_i2c_driver(si4713_i2c_driver);