Re: [PATCH 3/3] media: Add support for the AM/FM radio chip KT0913 from KT Micro.
From: Hans Verkuil
Date: Mon Aug 03 2020 - 09:05:17 EST
On 03/08/2020 04:09, Santiago Hormazabal wrote:
> This chip requires almost no support components and can used over I2C.
> The driver uses the I2C bus and exposes the controls as a V4L2 radio.
> Tested with a module that contains this chip (from SZZSJDZ.com,
> part number ZJ-801B, even tho the company seems defunct now), and an H2+
> AllWinner SoC running a kernel built off 8f2a4a9 of the media_tree.
>
> Signed-off-by: Santiago Hormazabal <santiagohssl@xxxxxxxxx>
> ---
It's good practice to list the changes you made for a v2 either in the
cover letter or here (below ---).
I have a preference myself for the cover letter, but either is fine.
> drivers/media/radio/Kconfig | 10 +
> drivers/media/radio/Makefile | 1 +
> drivers/media/radio/radio-kt0913.c | 1196 ++++++++++++++++++++++++++++
> 3 files changed, 1207 insertions(+)
> create mode 100644 drivers/media/radio/radio-kt0913.c
>
> diff --git a/drivers/media/radio/Kconfig b/drivers/media/radio/Kconfig
> index d29e29645e04..ac9053a95f3a 100644
> --- a/drivers/media/radio/Kconfig
> +++ b/drivers/media/radio/Kconfig
> @@ -226,6 +226,16 @@ config RADIO_WL1273
> # TI's ST based wl128x FM radio
> source "drivers/media/radio/wl128x/Kconfig"
>
> +config RADIO_KT0913
> + tristate "KT0913 I2C FM/AM radio support"
> + depends on I2C && VIDEO_V4L2
> + help
> + Say Y here if you want to use the KT0913 FM/AM chip.
> + This is a low cost chip that uses the I2C bus.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called radio-kt0913.
> +
> #
> # ISA drivers configuration
> #
> diff --git a/drivers/media/radio/Makefile b/drivers/media/radio/Makefile
> index 53c7ae135460..a314121f7771 100644
> --- a/drivers/media/radio/Makefile
> +++ b/drivers/media/radio/Makefile
> @@ -34,5 +34,6 @@ obj-$(CONFIG_RADIO_WL1273) += radio-wl1273.o
> obj-$(CONFIG_RADIO_WL128X) += wl128x/
> obj-$(CONFIG_RADIO_TEA575X) += tea575x.o
> obj-$(CONFIG_USB_RAREMONO) += radio-raremono.o
> +obj-$(CONFIG_RADIO_KT0913) += radio-kt0913.o
>
> shark2-objs := radio-shark2.o radio-tea5777.o
> diff --git a/drivers/media/radio/radio-kt0913.c b/drivers/media/radio/radio-kt0913.c
> new file mode 100644
> index 000000000000..e8c1ff882779
> --- /dev/null
> +++ b/drivers/media/radio/radio-kt0913.c
> @@ -0,0 +1,1196 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * drivers/media/radio/radio-kt0913.c
> + *
> + * Driver for the KT0913 radio chip from KTMicro.
> + * This driver provides a v4l2 interface to the tuner, using the I2C
> + * protocol to communicate with the chip.
> + * It exposes two bands, one for AM and another for FM. If the "campus
> + * band" feature needs to be enabled, set the corresponding module parameter
> + * to 1.
> + * Reference Clock and Audio DAC anti-pop configurations should be
> + * set via a device tree node. Defaults will be used otherwise.
> + *
> + * Audio output should be routed to a speaker or an audio capture
> + * device.
> + *
> + * Based on radio-tea5764 by Fabio Belavenuto <belavenuto@xxxxxxxxx>
> + *
> + * Copyright (c) 2020 Santiago Hormazabal <santiagohssl@xxxxxxxxx>
> + *
> + * TODO:
> + * use rd and wr support for the regmap instead of volatile regs.
> + * add support for the hardware-assisted frequency seek.
> + * export FM SNR and AM/FM AFC deviation values as RO controls.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +#include <linux/err.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/of.h>
> +#include <linux/math64.h>
> +#include <linux/regmap.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-event.h>
> +
> + /* ************************************************************************* */
> +
> + /* registers of the kt0913 */
> +#define KT0913_REG_CHIP_ID 0x01
> +#define KT0913_REG_SEEK 0x02
> +#define KT0913_REG_TUNE 0x03
> +#define KT0913_REG_VOLUME 0x04
> +#define KT0913_REG_DSPCFGA 0x05
> +#define KT0913_REG_LOCFGA 0x0A
> +#define KT0913_REG_LOCFGC 0x0C
> +#define KT0913_REG_RXCFG 0x0F
> +#define KT0913_REG_STATUSA 0x12
> +#define KT0913_REG_STATUSB 0x13
> +#define KT0913_REG_STATUSC 0x14
> +#define KT0913_REG_AMSYSCFG 0x16
> +#define KT0913_REG_AMCHAN 0x17
> +#define KT0913_REG_AMCALI 0x18
> +#define KT0913_REG_GPIOCFG 0x1D
> +#define KT0913_REG_AMDSP 0x22
> +#define KT0913_REG_AMSTATUSA 0x24
> +#define KT0913_REG_AMSTATUSB 0x25
> +#define KT0913_REG_SOFTMUTE 0x2E
> +#define KT0913_REG_AMCFG 0x33
> +#define KT0913_REG_AMCFG2 0x34
> +#define KT0913_REG_AFC 0x3C
Hmm, this is still uppercase.
> +
> +/* register symbols masks, values and shift count */
> +#define KT0913_TUNE_FMTUNE_MASK 0x8000 /* FM Tune enable */
> +#define KT0913_TUNE_FMTUNE_ON 0x8000 /* FM Tune enabled */
> +#define KT0913_TUNE_FMTUNE_OFF 0x0000 /* FM Tune disabled */
> +#define KT0913_TUNE_FMCHAN_MASK 0x0FFF /* frequency in kHz / 50kHz */
> +
> +#define KT0913_VOLUME_DMUTE_MASK 0x2000
> +#define KT0913_VOLUME_DMUTE_ON 0x0000
> +#define KT0913_VOLUME_DMUTE_OFF 0x2000
> +#define KT0913_VOLUME_DE_MASK 0x0800 /* de-emphasis time constant */
> +#define KT0913_VOLUME_DE_75US 0x0000 /* 75us */
> +#define KT0913_VOLUME_DE_50US 0x0800 /* 50us */
> +#define KT0913_VOLUME_POP_MASK 0x30 /* audio dac anti-pop config */
> +#define KT0913_VOLUME_POP_SHIFT 4
> +
> +#define KT0913_DSPCFGA_MONO_MASK 0x8000 /* mono select (0=stereo, 1=mono) */
> +#define KT0913_DSPCFGA_MONO_ON 0x8000 /* mono */
> +#define KT0913_DSPCFGA_MONO_OFF 0x0000 /* stereo */
> +
> +#define KT0913_LOCFG_CAMPUSBAND_EN_MASK 0x0008 /* campus band fm enable */
> +#define KT0913_LOCFG_CAMPUSBAND_EN_ON 0x0008 /* FM range 64-110MHz */
> +#define KT0913_LOCFG_CAMPUSBAND_EN_OFF 0x0000 /* FM range 32-110MHz */
> +
> +#define KT0913_RXCFGA_STDBY_MASK 0x1000 /* standby mode enable */
> +#define KT0913_RXCFGA_STDBY_ON 0x1000 /* standby mode enabled */
> +#define KT0913_RXCFGA_STDBY_OFF 0x0000 /* standby mode disabled */
> +#define KT0913_RXCFGA_VOLUME_MASK 0x001F /* volume control */
> +
> +#define KT0913_STATUSA_XTAL_OK 0x8000 /* crystal ready indicator */
> +#define KT0913_STATUSA_STC 0x4000 /* seek/tune complete */
> +
> +#define KT0913_STATUSA_PLL_LOCK_MASK 0x800 /* system pll ready indicator */
> +#define KT0913_STATUSA_PLL_LOCK_LOCKED 0x800 /* system pll ready */
> +#define KT0913_STATUSA_PLL_LOCK_UNLOCKED 0x000 /* not ready */
> +#define KT0913_STATUSA_LO_LOCK 0x400 /* LO synthesizer ready indicator */
> +#define KT0913_STATUSA_ST_MASK 0x300 /* stereo indicator (0x300=stereo, otherwise mono) */
> +#define KT0913_STATUSA_ST_STEREO 0x300 /* stereo */
> +#define KT0913_STATUSA_FMRSSI_MASK 0xF8 /* FM RSSI (-100dBm + FMRSSI*3dBm) */
> +#define KT0913_STATUSA_FMRSSI_SHIFT 3
> +
> +#define KT0913_STATUSC_PWSTATUS 0x8000 /* power status indicator */
> +#define KT0913_STATUSC_CHIPRDY 0x2000 /* chip ready indicator */
> +#define KT0913_STATUSC_FMSNR 0x1FC0 /* FM SNR (unknown units) */
> +
> +#define KT0913_AMCHAN_AMTUNE_MASK 0x8000 /* AM tune enable */
> +#define KT0913_AMCHAN_AMTUNE_ON 0x8000 /* AM tune enabled */
> +#define KT0913_AMCHAN_AMTUNE_OFF 0x0000 /* AM tune disabled */
> +#define KT0913_AMCHAN_AMCHAN_MASK 0x7FF /* am channel in kHz */
> +
> +#define KT0913_AMSYSCFG_AM_FM_MASK 0x8000 /* am/fm mode control */
> +#define KT0913_AMSYSCFG_AM_FM_AM 0x8000 /* am mode */
> +#define KT0913_AMSYSCFG_AM_FM_FM 0x0000 /* fm mode (default) */
> +#define KT0913_AMSYSCFG_REFCLK_MASK 0x0F00 /* reference clock selection */
> +#define KT0913_AMSYSCFG_REFCLK_SHIFT 8
> +#define KT0913_AMSYSCFG_AU_GAIN_MASK 0x00C0 /* audio gain selection */
> +#define KT0913_AMSYSCFG_AU_GAIN_6DB 0x0040 /* 6dB audio gain */
> +#define KT0913_AMSYSCFG_AU_GAIN_3DB 0x0000 /* 3dB audio gain (default) */
> +#define KT0913_AMSYSCFG_AU_GAIN_0DB 0x00C0 /* 0dB audio gain */
> +#define KT0913_AMSYSCFG_AU_GAIN_MIN_3DB 0x0080 /* -3dB audio gain */
> +
> +#define KT0913_AMSTATUSA_AMRSSI_MASK 0x1F00 /* am channel rssi */
> +#define KT0913_AMSTATUSA_AMRSSI_SHIFT 8
> +
> +/* constants */
> +#define KT0913_CHIP_ID 0x544B /* ASCII of 'KT' */
> +
> +#define V4L2_KHZ_FREQ_MUL 16U /* v4l2 uses 16x the kHz value as their freq */
> +#define KT0913_FMCHAN_MUL 50U /* kt0913 uses freqs with a 50kHz multiplier */
> +#define KT0913_FM_RANGE_LOW_NO_CAMPUS 64000U /* 64MHz lower bound for FM */
> +#define KT0913_FM_RANGE_LOW_CAMPUS 32000U /* 32MHz lower bound for campus FM */
> +#define KT0913_FM_RANGE_HIGH 110000U /* 110MHz upper bound for FM */
> +#define KT0913_AM_RANGE_LOW 500U /* 500kHz lower bound for AM */
> +#define KT0913_AM_RANGE_HIGH 1710U /* 1710kHz upper bound for AM */
> +
> +#define KT0913_FM_AM_DRIVER_NAME "kt0913-fm-am"
Just name it "kt0913". Does it just support the 0913 or other variants as well?
I wonder if it should perhaps be named "kt091x". Up to you.
> +
> +/* ************************************************************************* */
> +
> +/* v4l2 device number to use. -1 will assign the next free one */
> +static int kt0913_v4l2_radio_nr = -1;
> +/* use the extended range of FM down to 32MHz. disabled by default */
> +static int kt0913_use_campus_band;
> +
> +/* ************************************************************************* */
> +
> +/* kt0913 status struct */
> +struct kt0913_device {
> + struct v4l2_device v4l2_dev; /* main v4l2 struct */
> + struct i2c_client *client; /* I2C client */
> + struct video_device vdev; /* vide_device struct */
> + struct v4l2_ctrl_handler ctrl_handler; /* ctrl_handler struct */
> +
> + /* V4L2 Controls */
> + struct v4l2_ctrl *ctrl_pll_lock; /* PLL lock */
> + struct v4l2_ctrl *ctrl_volume; /* Overall volume */
> + struct v4l2_ctrl *ctrl_au_gain; /* Audio Gain */
> + struct v4l2_ctrl *ctrl_mute; /* Master mute */
> + struct v4l2_ctrl *ctrl_deemp; /* Deemphasis */
> +
> + /* current operation band (fm, fm_campus, am) */
> + unsigned int band;
> +
> + /* audio dac anti-pop setting:
> + * 0 -> 100uF (default)
> + * 1 -> 60uF
> + * 2 -> 20uF
> + * 3 -> 10uF
> + */
> + unsigned int audio_anti_pop;
> +
> + /*
> + * reference clock selection:
> + * 0 -> 32.768kHz (default)
> + * 1 -> 6.5MHz
> + * 2 -> 7.6MHz
> + * 3 -> 12MHz
> + * 4 -> 13MHz
> + * 5 -> 15.2MHz
> + * 6 -> 19.2MHz
> + * 7 -> 24MHz
> + * 8 -> 26MHz
> + * 9 -> 38kHz
> + */
> + unsigned int refclock_val;
> +
> + /* Regmap */
> + struct regmap *regmap;
> +
> + /* For core assisted locking */
> + struct mutex mutex;
> +};
> +
> +/* ************************************************************************* */
> +
> +/* Regmap settings */
> +static const struct regmap_range kt0913_regmap_all_registers_range[] = {
> + regmap_reg_range(0x01, 0x05),
> + regmap_reg_range(0x0A, 0x0A),
> + regmap_reg_range(0x0C, 0x0C),
> + regmap_reg_range(0x0F, 0x0F),
> + regmap_reg_range(0x12, 0x14),
> + regmap_reg_range(0x16, 0x18),
> + regmap_reg_range(0x1D, 0x1D),
> + regmap_reg_range(0x22, 0x22),
> + regmap_reg_range(0x24, 0x25),
> + regmap_reg_range(0x2E, 0x2F),
> + regmap_reg_range(0x30, 0x34),
> + regmap_reg_range(0x3A, 0x3A),
> + regmap_reg_range(0x3C, 0x3C),
> +};
> +
> +static const struct regmap_access_table kt0913_all_registers_access_table = {
> + .yes_ranges = kt0913_regmap_all_registers_range,
> + .n_yes_ranges = ARRAY_SIZE(kt0913_regmap_all_registers_range),
> +};
> +
> +static const struct reg_sequence kt0913_init_regs_to_defaults[] = {
> + /* Standby disabled, volume 0dB */
> + { KT0913_REG_RXCFG, 0x881F },
> + /* FM Channel spacing = 50kHz, Right & Left unmuted */
> + { KT0913_REG_SEEK, 0x000B },
> + /* Stereo, High Stereo/Mono blend level, blend disabled */
> + { KT0913_REG_DSPCFGA, 0x1000 },
> + /* FM AFC Enabled */
> + { KT0913_REG_LOCFGA, 0x0100 },
> + /* Campus band disabled by default */
> + { KT0913_REG_LOCFGC, 0x0024 },
> + /*
> + * FM mode, internal defined bands, clock from XT, 32.768kHz
> + * 3dB audio gain, AM AFC Enabled
> + */
> + { KT0913_REG_AMSYSCFG, 0x0002 },
> + /* Default AM freq = 504kHz */
> + { KT0913_REG_AMCHAN, 0x01F8},
> + /* VOL and CH GPIOs set to HiZ */
> + { KT0913_REG_GPIOCFG, 0x0000 },
> + /* AM Channel bandwidth = 6kHz, non-differential output */
> + { KT0913_REG_AMDSP, 0xAFC4 },
> + /*
> + * softmute is disabled on AM and FM, but set the defaults:
> + * strong softmute attn., slow softmute attack/recover,
> + * lowest AM softumte start level, almost the minimum
> + * softmute target volume, RSSI mode for softmute, lowest
> + * FM softmute start level
> + */
> + { KT0913_REG_SOFTMUTE, 0x0010 },
> + /* 1kHz for AM channel space, working mode A for the keys */
> + { KT0913_REG_AMCFG, 0x1401 },
> + /* TIME1 = shortest, TIME2 = fastest */
> + { KT0913_REG_AMCFG, 0x4050 },
> + /* set 86MHz as the default frequency, and tune it */
> + { KT0913_REG_TUNE, 0x86B8 },
> + /*
> + * FM&AM Softmute disabled, Mute disabled, 75us deemp.,
> + * no bass boost, 100uF anti pop cap
> + */
> + { KT0913_REG_VOLUME, 0xE080 },
> +};
> +
> +static const struct regmap_config kt0913_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 16,
> + .max_register = KT0913_REG_AFC,
> + .volatile_table = &kt0913_all_registers_access_table,
> + .cache_type = REGCACHE_RBTREE,
> + .val_format_endian = REGMAP_ENDIAN_BIG,
> +};
> +
> +/* ************************************************************************* */
> +
> +/* bands where the kt0913 operates */
> +enum { BAND_FM, BAND_FM_CAMUS, BAND_AM };
This is still CAMUS. I wonder if you reposted v1 instead of v2.
I stop reviewing because this doesn't seem right.
Regards,
Hans
> +
> +static const struct v4l2_frequency_band kt0913_bands[] = {
> + {
> + /* BAND_FM */
> + .type = V4L2_TUNER_RADIO,
> + .index = 0, /* index provided to v4l2 */
> + .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
> + V4L2_TUNER_CAP_FREQ_BANDS,
> + .rangelow = KT0913_FM_RANGE_LOW_NO_CAMPUS * V4L2_KHZ_FREQ_MUL,
> + .rangehigh = KT0913_FM_RANGE_HIGH * V4L2_KHZ_FREQ_MUL,
> + .modulation = V4L2_BAND_MODULATION_FM,
> + },
> + {
> + /* BAND_FM_CAMUS */
> + .type = V4L2_TUNER_RADIO,
> + .index = 0, /* index provided to v4l2 */
> + .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
> + V4L2_TUNER_CAP_FREQ_BANDS,
> + .rangelow = KT0913_FM_RANGE_LOW_CAMPUS * V4L2_KHZ_FREQ_MUL,
> + .rangehigh = KT0913_FM_RANGE_HIGH * V4L2_KHZ_FREQ_MUL,
> + .modulation = V4L2_BAND_MODULATION_FM,
> + },
> + {
> + /* BAND_AM */
> + .type = V4L2_TUNER_RADIO,
> + .index = 1, /* index provided to v4l2 */
> + .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS,
> + .rangelow = KT0913_AM_RANGE_LOW * V4L2_KHZ_FREQ_MUL,
> + .rangehigh = KT0913_AM_RANGE_HIGH * V4L2_KHZ_FREQ_MUL,
> + .modulation = V4L2_BAND_MODULATION_AM,
> + },
> +};
> +
> +/* ************************************************************************* */
> +
> +static inline struct kt0913_device *
> +v4l2_device_to_device(struct v4l2_device *v4l2_dev)
> +{
> + return container_of(v4l2_dev,
> + struct kt0913_device, v4l2_dev);
> +}
> +
> +static inline struct kt0913_device *
> +v4l2_ctrl_to_device(struct v4l2_ctrl *ctrl_handler)
> +{
> + return container_of(ctrl_handler->handler,
> + struct kt0913_device, ctrl_handler);
> +}
> +
> +/* ************************************************************************* */
> +
> +static inline u32 khz_to_v4l2_freq(unsigned int freq)
> +{
> + return freq * V4L2_KHZ_FREQ_MUL;
> +}
> +
> +static inline unsigned int v4l2_freq_to_khz(u32 v4l2_freq)
> +{
> + return v4l2_freq / V4L2_KHZ_FREQ_MUL;
> +}
> +
> +/* ************************************************************************* */
> +
> +static int __kt0913_get_fm_frequency(struct kt0913_device *radio,
> + unsigned int *frequency)
> +{
> + unsigned int tune_reg;
> + int ret = regmap_read(radio->regmap, KT0913_REG_TUNE, &tune_reg);
> +
> + if (ret)
> + return ret;
> +
> + *frequency = (tune_reg & KT0913_TUNE_FMCHAN_MASK) * KT0913_FMCHAN_MUL;
> +
> + return 0;
> +}
> +
> +static int __kt0913_set_fm_frequency(struct kt0913_device *radio,
> + unsigned int frequency)
> +{
> + return regmap_write(radio->regmap, KT0913_REG_TUNE,
> + KT0913_TUNE_FMTUNE_ON | (frequency / KT0913_FMCHAN_MUL));
> +}
> +
> +/* ************************************************************************* */
> +
> +static int __kt0913_set_mute(struct kt0913_device *radio, int on)
> +{
> + return regmap_update_bits(radio->regmap,
> + KT0913_REG_VOLUME, KT0913_VOLUME_DMUTE_MASK,
> + on ? KT0913_VOLUME_DMUTE_ON : KT0913_VOLUME_DMUTE_OFF);
> +}
> +
> +/* ************************************************************************* */
> +
> +static int __kt0913_set_deemphasis(struct kt0913_device *radio, s32 deemp)
> +{
> + switch (deemp) {
> + case V4L2_DEEMPHASIS_75_uS:
> + return regmap_update_bits(radio->regmap,
> + KT0913_REG_VOLUME, KT0913_VOLUME_DE_MASK,
> + KT0913_VOLUME_DE_50US);
> +
> + /* 50us is used for the disabled option (which is not supported
> + * on the chip) and the 50uS value
> + */
> + default:
> + return regmap_update_bits(radio->regmap,
> + KT0913_REG_VOLUME, KT0913_VOLUME_DE_MASK,
> + KT0913_VOLUME_DE_75US);
> + }
> +}
> +
> +/* ************************************************************************* */
> +
> +static int __kt0913_set_volume(struct kt0913_device *radio, s32 volume)
> +{
> + /* map [-60, 0] to [1, 31] which is what the kt0913 expects */
> + volume = (volume / 2) + 31;
> + return regmap_update_bits(radio->regmap,
> + KT0913_REG_RXCFG, KT0913_RXCFGA_VOLUME_MASK,
> + volume);
> +}
> +
> +/* ************************************************************************* */
> +
> +static int __kt0913_set_standby(struct kt0913_device *radio, int standby)
> +{
> + return regmap_update_bits(radio->regmap,
> + KT0913_REG_RXCFG, KT0913_RXCFGA_STDBY_MASK,
> + standby ? KT0913_RXCFGA_STDBY_ON : KT0913_RXCFGA_STDBY_OFF);
> +}
> +
> +/* ************************************************************************* */
> +
> +static int __kt0913_get_pll_status(struct kt0913_device *radio, int *locked)
> +{
> + unsigned int statusa_reg;
> + int ret = regmap_read(radio->regmap, KT0913_REG_STATUSA, &statusa_reg);
> +
> + if (ret)
> + return ret;
> +
> + *locked = (statusa_reg & KT0913_STATUSA_PLL_LOCK_MASK) ==
> + KT0913_STATUSA_PLL_LOCK_LOCKED ? 1 : 0;
> +
> + return 0;
> +}
> +
> +/* ************************************************************************* */
> +
> +static int __kt0913_get_rx_stereo_or_mono(struct kt0913_device *radio,
> + int *stereo)
> +{
> + unsigned int statusa_reg;
> + int ret = regmap_read(radio->regmap, KT0913_REG_STATUSA, &statusa_reg);
> +
> + if (ret)
> + return ret;
> +
> + *stereo = (statusa_reg & KT0913_STATUSA_ST_MASK) ==
> + KT0913_STATUSA_ST_STEREO ? 1 : 0;
> +
> + return 0;
> +}
> +
> +/* ************************************************************************* */
> +
> +static int __kt0913_get_fm_rssi(struct kt0913_device *radio, s32 *rssi)
> +{
> + unsigned int statusa_reg;
> + int ret = regmap_read(radio->regmap, KT0913_REG_STATUSA, &statusa_reg);
> +
> + if (ret)
> + return ret;
> +
> + /* RSSI(dBm) = -100 + FMRSSI<4:0> * 3dBm
> + * even tho we can get the value in dBm, we want a %
> + */
> + *rssi = (statusa_reg & KT0913_STATUSA_FMRSSI_MASK) >>
> + KT0913_STATUSA_FMRSSI_SHIFT;
> + /* map range 0-31 to 0-65535 */
> + *rssi *= 65535;
> + *rssi /= KT0913_STATUSA_FMRSSI_MASK >> KT0913_STATUSA_FMRSSI_SHIFT;
> +
> + return 0;
> +}
> +
> +/* ************************************************************************* */
> +
> +static int __kt0913_get_cfg_stereo_enabled(struct kt0913_device *radio,
> + int *stereo)
> +{
> + unsigned int dspcfga_reg;
> + int ret = regmap_read(radio->regmap, KT0913_REG_DSPCFGA, &dspcfga_reg);
> +
> + if (ret)
> + return ret;
> +
> + *stereo = (dspcfga_reg & KT0913_DSPCFGA_MONO_MASK) ==
> + KT0913_DSPCFGA_MONO_OFF ? 1 : 0;
> +
> + return ret;
> +}
> +
> +static int __kt0913_set_cfg_stereo_enabled(struct kt0913_device *radio,
> + int stereo)
> +{
> + return regmap_update_bits(radio->regmap,
> + KT0913_REG_DSPCFGA, KT0913_DSPCFGA_MONO_MASK,
> + stereo ? KT0913_DSPCFGA_MONO_OFF : KT0913_DSPCFGA_MONO_ON);
> +}
> +
> +/* ************************************************************************* */
> +
> +static int __kt0913_set_au_gain(struct kt0913_device *radio, s32 gain)
> +{
> + switch (gain) {
> + case 6:
> + return regmap_update_bits(radio->regmap,
> + KT0913_REG_AMSYSCFG, KT0913_AMSYSCFG_AU_GAIN_MASK,
> + KT0913_AMSYSCFG_AU_GAIN_6DB);
> + case 3:
> + return regmap_update_bits(radio->regmap,
> + KT0913_REG_AMSYSCFG, KT0913_AMSYSCFG_AU_GAIN_MASK,
> + KT0913_AMSYSCFG_AU_GAIN_3DB);
> + case 0:
> + return regmap_update_bits(radio->regmap,
> + KT0913_REG_AMSYSCFG, KT0913_AMSYSCFG_AU_GAIN_MASK,
> + KT0913_AMSYSCFG_AU_GAIN_0DB);
> + case -3:
> + return regmap_update_bits(radio->regmap,
> + KT0913_REG_AMSYSCFG, KT0913_AMSYSCFG_AU_GAIN_MASK,
> + KT0913_AMSYSCFG_AU_GAIN_MIN_3DB);
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +/* ************************************************************************* */
> +
> +static int __kt0913_set_am_fm_band(struct kt0913_device *radio,
> + unsigned int band)
> +{
> + return regmap_update_bits(radio->regmap,
> + KT0913_REG_AMSYSCFG, KT0913_AMSYSCFG_AM_FM_MASK,
> + band == BAND_AM ?
> + KT0913_AMSYSCFG_AM_FM_AM : KT0913_AMSYSCFG_AM_FM_FM);
> +}
> +
> +/* ************************************************************************* */
> +
> +static int __kt0913_get_am_frequency(struct kt0913_device *radio,
> + unsigned int *frequency)
> +{
> + unsigned int amchan_reg;
> + int ret = regmap_read(radio->regmap, KT0913_REG_AMCHAN, &amchan_reg);
> +
> + if (ret)
> + return ret;
> +
> + *frequency = (amchan_reg & KT0913_AMCHAN_AMCHAN_MASK);
> +
> + return 0;
> +}
> +
> +static int __kt0913_set_am_frequency(struct kt0913_device *radio,
> + unsigned int frequency)
> +{
> + return regmap_write(radio->regmap, KT0913_REG_AMCHAN,
> + KT0913_AMCHAN_AMTUNE_ON | frequency);
> +}
> +
> +/* ************************************************************************* */
> +
> +static int __kt0913_get_am_rssi(struct kt0913_device *radio, s32 *rssi)
> +{
> + unsigned int amstatusa_reg;
> + int ret = regmap_read(radio->regmap,
> + KT0913_REG_AMSTATUSA, &amstatusa_reg);
> +
> + if (ret)
> + return ret;
> +
> + /* AMRSSI(dBm) = -90 + AMRSSI<4:0> * 3dBm
> + * even tho we can get the value in dBm, we want a %
> + */
> + *rssi = (amstatusa_reg & KT0913_AMSTATUSA_AMRSSI_MASK) >>
> + KT0913_AMSTATUSA_AMRSSI_SHIFT;
> + /* map range 0-31 to 0-65535 */
> + *rssi *= 65535;
> + *rssi /= KT0913_AMSTATUSA_AMRSSI_MASK >> KT0913_AMSTATUSA_AMRSSI_SHIFT;
> +
> + return 0;
> +}
> +
> +/* ************************************************************************* */
> +
> +static int __kt0913_init(struct kt0913_device *radio)
> +{
> + int ret = 0;
> +
> + /* write the defaults */
> + ret = regmap_multi_reg_write(radio->regmap,
> + kt0913_init_regs_to_defaults,
> + ARRAY_SIZE(kt0913_init_regs_to_defaults));
> + if (ret) {
> + v4l2_err(radio->client,
> + "regmap_multi_reg_write() failed! %d", ret);
> + return ret;
> + }
> +
> + /* set the audio dac anti-pop config */
> + ret = regmap_update_bits(radio->regmap,
> + KT0913_REG_VOLUME, KT0913_VOLUME_POP_MASK,
> + radio->audio_anti_pop <<
> + KT0913_VOLUME_POP_SHIFT);
> + if (ret) {
> + v4l2_err(radio->client,
> + "regmap_update_bits() err on anti-pop cfg! %d", ret);
> + return ret;
> + }
> +
> + /* set the reference clock config */
> + ret = regmap_update_bits(radio->regmap,
> + KT0913_REG_AMSYSCFG,
> + KT0913_AMSYSCFG_REFCLK_MASK,
> + radio->refclock_val <<
> + KT0913_AMSYSCFG_REFCLK_SHIFT);
> + if (ret) {
> + v4l2_err(radio->client,
> + "regmap_update_bits() err on refclk cfg! %d", ret);
> + return ret;
> + }
> +
> + if (kt0913_use_campus_band) {
> + v4l2_info(radio->client,
> + "campus band is enabled!");
> + /* set the campus band bit */
> + ret = regmap_update_bits(radio->regmap,
> + KT0913_REG_LOCFGC,
> + KT0913_LOCFG_CAMPUSBAND_EN_MASK,
> + KT0913_LOCFG_CAMPUSBAND_EN_ON);
> + if (ret) {
> + v4l2_err(radio->client,
> + "regmap_update_bits() err on campus band! %d",
> + ret);
> + return ret;
> + }
> + }
> +
> + return __kt0913_set_mute(radio, true);
> +}
> +
> +/* ************************************************************************* */
> +
> +static int kt0913_ioctl_vidioc_g_frequency(struct file *file, void *priv,
> + struct v4l2_frequency *f)
> +{
> + struct kt0913_device *radio = video_drvdata(file);
> + int ret;
> +
> + if (f->tuner != 0)
> + return -EINVAL;
> +
> + f->type = V4L2_TUNER_RADIO;
> +
> + if (radio->band == BAND_AM)
> + ret = __kt0913_get_am_frequency(radio, &f->frequency);
> + else
> + ret = __kt0913_get_fm_frequency(radio, &f->frequency);
> +
> + if (ret)
> + return ret;
> +
> + /* convert kHz freq into v4l2 freq */
> + f->frequency = khz_to_v4l2_freq(f->frequency);
> +
> + return 0;
> +}
> +
> +static int kt0913_ioctl_vidioc_s_frequency(struct file *file, void *priv,
> + const struct v4l2_frequency *f)
> +{
> + struct kt0913_device *radio = video_drvdata(file);
> + unsigned int freq = f->frequency;
> + unsigned int new_band;
> + unsigned int half_gap_freq;
> + int ret;
> +
> + if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
> + return -EINVAL;
> +
> + if (freq == 0)
> + return -EINVAL;
> +
> + /* calculate the middle frequency on the gap of the bands */
> + half_gap_freq = kt0913_bands[BAND_AM].rangehigh;
> +
> + if (kt0913_use_campus_band)
> + /* using the AM band and the campus FM band if enabled */
> + half_gap_freq += kt0913_bands[BAND_FM_CAMUS].rangelow;
> + else
> + /* or using the AM band and the standard FM band */
> + half_gap_freq += kt0913_bands[BAND_FM].rangelow;
> +
> + half_gap_freq /= 2;
> +
> + if (freq <= half_gap_freq)
> + new_band = BAND_AM;
> + else if (freq <= kt0913_bands[BAND_FM].rangelow &&
> + kt0913_use_campus_band)
> + new_band = BAND_FM_CAMUS;
> + else
> + new_band = BAND_FM;
> +
> + /* is the requested band different than the one currently set? */
> + if (radio->band != new_band) {
> + /* update the band on the device */
> + ret = __kt0913_set_am_fm_band(radio, new_band);
> + if (ret)
> + return ret;
> + radio->band = new_band;
> + }
> +
> + /* clamp the frequency to the band boundaries */
> + freq = clamp(freq, kt0913_bands[new_band].rangelow,
> + kt0913_bands[new_band].rangehigh);
> +
> + /* convert v4l2 freq to kHz */
> + freq = v4l2_freq_to_khz(freq);
> +
> + if (radio->band == BAND_AM)
> + return __kt0913_set_am_frequency(radio, freq);
> + else
> + return __kt0913_set_fm_frequency(radio, freq);
> +}
> +
> +static int kt0913_ioctl_vidioc_enum_freq_bands(struct file *file, void *priv,
> + struct v4l2_frequency_band *band)
> +{
> + if (band->tuner != 0)
> + return -EINVAL;
> +
> + switch (band->index) {
> + case 0:
> + if (kt0913_use_campus_band)
> + *band = kt0913_bands[BAND_FM_CAMUS];
> + else
> + *band = kt0913_bands[BAND_FM];
> + return 0;
> + case 1:
> + *band = kt0913_bands[BAND_AM];
> + return 0;
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +/* ************************************************************************* */
> +
> +/* V4L2 vidioc */
> +static int kt0913_ioctl_vidioc_querycap(struct file *file, void *priv,
> + struct v4l2_capability *capability)
> +{
> + struct kt0913_device *radio = video_drvdata(file);
> + struct video_device *dev;
> +
> + if (!radio)
> + return -ENODEV;
> +
> + dev = &radio->vdev;
> +
> + if (!dev)
> + return -ENODEV;
> +
> + strscpy(capability->driver, KT0913_FM_AM_DRIVER_NAME,
> + sizeof(capability->driver));
> + strscpy(capability->card, dev->name, sizeof(capability->card));
> + snprintf(capability->bus_info, sizeof(capability->bus_info),
> + "I2C:%s", dev_name(&dev->dev));
> + return 0;
> +}
> +
> +static int kt0913_ioctl_vidioc_g_tuner(struct file *file, void *priv,
> + struct v4l2_tuner *v)
> +{
> + struct kt0913_device *radio = video_drvdata(file);
> + int ret;
> + int stereo_enabled;
> + int is_stereo;
> +
> + if (v->index != 0)
> + return -EINVAL;
> +
> + strscpy(v->name, "FM/AM", sizeof(v->name));
> + v->type = V4L2_TUNER_RADIO;
> +
> + v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
> + V4L2_TUNER_CAP_FREQ_BANDS;
> +
> + v->rangelow = kt0913_bands[BAND_AM].rangelow;
> + v->rangehigh = kt0913_bands[BAND_FM].rangehigh;
> +
> + if (radio->band == BAND_AM) {
> + v->rxsubchans = V4L2_TUNER_SUB_MONO;
> + v->audmode = V4L2_TUNER_MODE_MONO;
> +
> + ret = __kt0913_get_am_rssi(radio, &v->signal);
> + if (ret)
> + return ret;
> + } else {
> + ret = __kt0913_get_cfg_stereo_enabled(radio, &stereo_enabled);
> + if (ret)
> + return ret;
> +
> + v->rxsubchans = stereo_enabled ?
> + V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
> +
> + ret = __kt0913_get_rx_stereo_or_mono(radio, &is_stereo);
> + if (ret)
> + return ret;
> +
> + v->audmode = is_stereo ?
> + V4L2_TUNER_MODE_STEREO : V4L2_TUNER_MODE_MONO;
> +
> + ret = __kt0913_get_fm_rssi(radio, &v->signal);
> + if (ret)
> + return ret;
> + }
> +
> + /* AFC is enabled and active by default */
> + v->afc = 1;
> +
> + return 0;
> +}
> +
> +static int kt0913_ioctl_vidioc_s_tuner(struct file *file, void *priv,
> + const struct v4l2_tuner *v)
> +{
> + struct kt0913_device *radio = video_drvdata(file);
> +
> + if (v->index != 0)
> + return -EINVAL;
> +
> + /* only mono and stereo are supported */
> + if (v->audmode != V4L2_TUNER_MODE_MONO &&
> + v->audmode != V4L2_TUNER_MODE_STEREO)
> + return 0;
> +
> + /* AM is mono only, so don't try to set it to stereo */
> + if (radio->band == BAND_AM && v->audmode != V4L2_TUNER_MODE_MONO)
> + return 0;
> +
> + /* set to stereo if specified, otherwise set to mono */
> + return __kt0913_set_cfg_stereo_enabled(radio,
> + v->audmode == V4L2_TUNER_MODE_STEREO);
> +}
> +
> +static int kt0913_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct kt0913_device *radio = v4l2_ctrl_to_device(ctrl);
> +
> + switch (ctrl->id) {
> + case V4L2_CID_AUDIO_MUTE:
> + return __kt0913_set_mute(radio, ctrl->val);
> + case V4L2_CID_AUDIO_VOLUME:
> + return __kt0913_set_volume(radio, ctrl->val);
> + case V4L2_CID_GAIN:
> + return __kt0913_set_au_gain(radio, ctrl->val);
> + case V4L2_CID_TUNE_DEEMPHASIS:
> + return __kt0913_set_deemphasis(radio, ctrl->val);
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int kt0913_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct kt0913_device *radio = v4l2_ctrl_to_device(ctrl);
> +
> + switch (ctrl->id) {
> + case V4L2_CID_RF_TUNER_PLL_LOCK:
> + return __kt0913_get_pll_status(radio, &ctrl->val);
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static const struct v4l2_ctrl_ops kt0913_ctrl_ops = {
> + .s_ctrl = kt0913_s_ctrl,
> + .g_volatile_ctrl = kt0913_g_volatile_ctrl,
> +};
> +
> +/* ************************************************************************* */
> +
> +/* File system interface (use the ancillary fops for v4l2) */
> +static const struct v4l2_file_operations kt0913_radio_fops = {
> + .owner = THIS_MODULE,
> + .open = v4l2_fh_open,
> + .release = v4l2_fh_release,
> + .poll = v4l2_ctrl_poll,
> + .unlocked_ioctl = video_ioctl2,
> +};
> +
> +/* ioctl ops */
> +static const struct v4l2_ioctl_ops kt0913_ioctl_ops = {
> + .vidioc_querycap = kt0913_ioctl_vidioc_querycap,
> + .vidioc_g_tuner = kt0913_ioctl_vidioc_g_tuner,
> + .vidioc_s_tuner = kt0913_ioctl_vidioc_s_tuner,
> + .vidioc_g_frequency = kt0913_ioctl_vidioc_g_frequency,
> + .vidioc_s_frequency = kt0913_ioctl_vidioc_s_frequency,
> + .vidioc_enum_freq_bands = kt0913_ioctl_vidioc_enum_freq_bands,
> + /* use ancillary functions for these: */
> + .vidioc_log_status = v4l2_ctrl_log_status,
> + .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
> + .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> +};
> +
> +/* V4L2 RADIO device structure */
> +static struct video_device kt0913_radio_template = {
> + .name = KT0913_FM_AM_DRIVER_NAME,
> + .fops = &kt0913_radio_fops,
> + .ioctl_ops = &kt0913_ioctl_ops,
> + .release = video_device_release_empty,
> + .vfl_dir = VFL_DIR_RX,
> + .device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO,
> +};
> +
> +/* ************************************************************************* */
> +
> +#if IS_ENABLED(CONFIG_OF)
> +static const struct of_device_id kt0913_of_match[] = {
> + { .compatible = "ktm,kt0913" },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, kt0913_of_match);
> +#endif /* IS_ENABLED(CONFIG_OF) */
> +
> +static void __kt0913_parse_dt(struct kt0913_device *radio)
> +{
> + const void *ptr_anti_pop = of_get_property(radio->client->dev.of_node,
> + "ktm,anti-pop", NULL);
> + const void *ptr_refclk = of_get_property(radio->client->dev.of_node,
> + "ktm,refclk", NULL);
> +
> + if (ptr_anti_pop) {
> + radio->audio_anti_pop =
> + clamp(be32_to_cpup(ptr_anti_pop), 0U, 3U);
> + } else {
> + radio->audio_anti_pop = 0;
> + v4l2_warn(radio->client,
> + "No ktm,anti-pop on dt node, using default");
> + }
> +
> + if (ptr_refclk) {
> + radio->refclock_val =
> + clamp(be32_to_cpup(ptr_refclk), 0U, 9U);
> + } else {
> + radio->refclock_val = 0;
> + v4l2_warn(radio->client,
> + "No ktm,refclk on dt node, using default");
> + }
> +}
> +
> +/* ************************************************************************* */
> +
> +static int kt0913_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct kt0913_device *radio;
> + struct v4l2_device *v4l2_dev;
> + struct v4l2_ctrl_handler *hdl;
> + struct regmap *regmap;
> + int ret;
> +
> + pr_debug("%s\n", __func__);
> +
> + /* this driver uses word R/W i2c operations, check if it's supported */
> + ret = i2c_check_functionality(client->adapter,
> + I2C_FUNC_SMBUS_READ_WORD_DATA |
> + I2C_FUNC_SMBUS_WRITE_WORD_DATA);
> + if (!ret) {
> + v4l2_err(client,
> + "I2C adapter doesn't support word operations");
> + return -EIO;
> + }
> +
> + /* check if the device exist on the bus before initializing it */
> + ret = i2c_smbus_read_word_data(client, KT0913_REG_CHIP_ID);
> + if (ret < 0) {
> + v4l2_err(client,
> + "Error reading CHIP ID of the kt0913 (%d)", ret);
> + return ret;
> + }
> +
> + /* check if the CHIP ID register value matches the expected value */
> + if (ret != KT0913_CHIP_ID) {
> + v4l2_err(radio->client,
> + "Invalid CHIP ID: 0x%x, expected 0x%x",
> + ret, KT0913_CHIP_ID);
> + return -ENODEV;
> + }
> +
> + v4l2_info(client,
> + "kt0913 found @ 0x%x (%s)\n",
> + client->addr, client->adapter->name);
> +
> + /* alloc context for the kt0913 radio struct */
> + radio = devm_kzalloc(&client->dev, sizeof(*radio), GFP_KERNEL);
> + if (!radio)
> + return -ENOMEM;
> +
> + v4l2_dev = &radio->v4l2_dev;
> + ret = v4l2_device_register(&client->dev, v4l2_dev);
> + if (ret < 0) {
> + v4l2_err(client,
> + "could not register v4l2_dev\n");
> + goto errfr;
> + }
> +
> + mutex_init(&radio->mutex);
> +
> + /* register the control handler from the context struct */
> + hdl = &radio->ctrl_handler;
> + v4l2_ctrl_handler_init(hdl, 5);
> +
> + /* add the control: Mute */
> + radio->ctrl_mute = v4l2_ctrl_new_std(hdl, &kt0913_ctrl_ops,
> + V4L2_CID_AUDIO_MUTE,
> + 0, 1, 1, 0);
> + if (hdl->error) {
> + ret = hdl->error;
> + v4l2_err(v4l2_dev, "Could not register control: mute\n");
> + goto errunreg;
> + }
> +
> + /* add the control: Volume */
> + radio->ctrl_volume = v4l2_ctrl_new_std(hdl, &kt0913_ctrl_ops,
> + V4L2_CID_AUDIO_VOLUME,
> + -60, 0, 2, 0);
> + if (hdl->error) {
> + ret = hdl->error;
> + v4l2_err(v4l2_dev, "Could not register control: Volume\n");
> + goto errunreg;
> + }
> +
> + /* add the control: audio gain */
> + radio->ctrl_au_gain = v4l2_ctrl_new_std(hdl, &kt0913_ctrl_ops,
> + V4L2_CID_GAIN,
> + -3, 6, 3, 3);
> + if (hdl->error) {
> + ret = hdl->error;
> + v4l2_err(v4l2_dev, "Could not register control: audio gain\n");
> + goto errunreg;
> + }
> + radio->ctrl_au_gain->flags |= V4L2_CTRL_FLAG_SLIDER;
> +
> + /* add the control: PLL Lock */
> + radio->ctrl_pll_lock = v4l2_ctrl_new_std(hdl, &kt0913_ctrl_ops,
> + V4L2_CID_RF_TUNER_PLL_LOCK,
> + 0, 1, 1, 0);
> + if (hdl->error) {
> + ret = hdl->error;
> + v4l2_err(v4l2_dev, "Could not register control: pll lock\n");
> + goto errunreg;
> + }
> + radio->ctrl_pll_lock->flags |= (V4L2_CTRL_FLAG_VOLATILE |
> + V4L2_CTRL_FLAG_READ_ONLY);
> +
> + /* add the control: deemphasis */
> + radio->ctrl_deemp = v4l2_ctrl_new_std_menu(hdl, &kt0913_ctrl_ops,
> + V4L2_CID_TUNE_DEEMPHASIS,
> + V4L2_DEEMPHASIS_75_uS,
> + 0,
> + V4L2_DEEMPHASIS_75_uS);
> + if (hdl->error) {
> + ret = hdl->error;
> + v4l2_err(v4l2_dev, "Could not register control: deemphasis\n");
> + goto errunreg;
> + }
> + /* the control handler is ready to be used */
> + v4l2_dev->ctrl_handler = hdl;
> +
> + radio->vdev = kt0913_radio_template;
> + radio->vdev.lock = &radio->mutex;
> + radio->vdev.v4l2_dev = v4l2_dev;
> + video_set_drvdata(&radio->vdev, radio);
> +
> + radio->client = client;
> + i2c_set_clientdata(client, radio);
> +
> + /* init the regmap of the kt0913 */
> + regmap = devm_regmap_init_i2c(client, &kt0913_regmap_config);
> + if (IS_ERR(regmap)) {
> + ret = PTR_ERR(regmap);
> + v4l2_err(client,
> + "devm_regmap_init_i2c() failed! %d", ret);
> + goto errunreg;
> + }
> + radio->regmap = regmap;
> +
> + __kt0913_parse_dt(radio);
> +
> + /* init the kt0913 into a known state */
> + ret = __kt0913_init(radio);
> + if (ret) {
> + v4l2_err(client,
> + "__kt0913_init() failed! %d", ret);
> + goto errunreg;
> + }
> +
> + pm_runtime_get_noresume(&client->dev);
> + pm_runtime_set_active(&client->dev);
> + pm_runtime_enable(&client->dev);
> + pm_runtime_dont_use_autosuspend(&client->dev);
> +
> + ret = video_register_device(&radio->vdev,
> + VFL_TYPE_RADIO, kt0913_v4l2_radio_nr);
> + if (ret < 0) {
> + v4l2_err(client,
> + "Could not register video device!");
> + goto error_pm_disable;
> + }
> +
> + v4l2_info(client, "registered.");
> + return 0;
> +error_pm_disable:
> + pm_runtime_disable(&client->dev);
> + pm_runtime_set_suspended(&client->dev);
> +errunreg:
> + v4l2_ctrl_handler_free(hdl);
> + v4l2_device_unregister(v4l2_dev);
> +errfr:
> + __kt0913_set_standby(radio, true);
> + kfree(radio);
> + return ret;
> +}
> +
> +static int kt0913_remove(struct i2c_client *client)
> +{
> + struct kt0913_device *radio = i2c_get_clientdata(client);
> +
> + pr_debug("%s\n", __func__);
> + if (!radio)
> + return -EINVAL;
> +
> + __kt0913_set_standby(radio, true);
> +
> + pm_runtime_get_sync(&client->dev);
> + pm_runtime_disable(&client->dev);
> + pm_runtime_set_suspended(&client->dev);
> + pm_runtime_put_noidle(&client->dev);
> +
> + video_unregister_device(&radio->vdev);
> + v4l2_ctrl_handler_free(&radio->ctrl_handler);
> + v4l2_device_unregister(&radio->v4l2_dev);
> +
> + v4l2_info(client, "removed.");
> + return 0;
> +}
> +
> +/* ************************************************************************* */
> +
> +#ifdef CONFIG_PM
> +static int kt0913_i2c_pm_runtime_suspend(struct device *dev)
> +{
> + struct kt0913_device *radio = i2c_get_clientdata(to_i2c_client(dev));
> +
> + pr_debug("%s\n", __func__);
> + if (!radio)
> + return 0;
> +
> + return __kt0913_set_standby(radio, true);
> +}
> +
> +static int kt0913_i2c_pm_runtime_resume(struct device *dev)
> +{
> + struct kt0913_device *radio = i2c_get_clientdata(to_i2c_client(dev));
> +
> + pr_debug("%s\n", __func__);
> + if (!radio)
> + return 0;
> +
> + return __kt0913_set_standby(radio, false);
> +}
> +#endif /* CONFIG_PM */
> +
> +static const struct dev_pm_ops kt0913_i2c_pm_ops = {
> + SET_RUNTIME_PM_OPS(kt0913_i2c_pm_runtime_suspend,
> + kt0913_i2c_pm_runtime_resume, NULL)
> +};
> +
> +static const struct i2c_device_id kt0913_idtable[] = {
> + { "kt0913", 0 },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(i2c, kt0913_idtable);
> +
> +static struct i2c_driver kt0913_driver = {
> + .driver = {
> + .name = "kt0913",
> + .of_match_table = of_match_ptr(kt0913_of_match),
> + .pm = &kt0913_i2c_pm_ops,
> + },
> + .probe = kt0913_probe,
> + .remove = kt0913_remove,
> + .id_table = kt0913_idtable,
> +};
> +module_i2c_driver(kt0913_driver);
> +
> +MODULE_AUTHOR("Santiago Hormazabal <santiagohssl@xxxxxxxxx>");
> +MODULE_DESCRIPTION("KTMicro KT0913 AM/FM receiver");
> +MODULE_LICENSE("GPL");
> +MODULE_VERSION("0.0.2");
> +
> +module_param(kt0913_use_campus_band, int, 0);
> +MODULE_PARM_DESC(kt0913_use_campus_band, "Use the Campus Band feature (FM range 32MHz-110MHz)");
> +module_param(kt0913_v4l2_radio_nr, int, 0);
> +MODULE_PARM_DESC(kt0913_v4l2_radio_nr, "v4l2 device number to use (i.e. /dev/radioX)");
>