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mfd: ntxec: Support for EC in Tolino Shine 2 HD

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Add the version of the EC in the Tolino Shine 2 HD
to the supported versions. It seems not to have an RTC
and does not ack data written to it.
The vendor kernel happily ignores write errors, using
I2C via userspace i2c-set also shows the error.
So add a quirk to ignore that error.

PWM can be successfully configured despite of that error.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Andreas Kemnade 2021-03-15 20:18:32 +01:00 committed by Lee Jones
parent 4917e498c6
commit d1157530d4
2 changed files with 54 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

56
drivers/mfd/ntxec.c
View file

@ -96,6 +96,38 @@ static struct notifier_block ntxec_restart_handler = {
.priority = 128,
};
static int regmap_ignore_write(void *context,
unsigned int reg, unsigned int val)
{
struct regmap *regmap = context;
regmap_write(regmap, reg, val);
return 0;
}
static int regmap_wrap_read(void *context, unsigned int reg,
unsigned int *val)
{
struct regmap *regmap = context;
return regmap_read(regmap, reg, val);
}
/*
* Some firmware versions do not ack written data, add a wrapper. It
* is used to stack another regmap on top.
*/
static const struct regmap_config regmap_config_noack = {
.name = "ntxec_noack",
.reg_bits = 8,
.val_bits = 16,
.cache_type = REGCACHE_NONE,
.reg_write = regmap_ignore_write,
.reg_read = regmap_wrap_read
};
static const struct regmap_config regmap_config = {
.name = "ntxec",
.reg_bits = 8,
@ -104,16 +136,22 @@ static const struct regmap_config regmap_config = {
.val_format_endian = REGMAP_ENDIAN_BIG,
};
static const struct mfd_cell ntxec_subdevices[] = {
static const struct mfd_cell ntxec_subdev[] = {
{ .name = "ntxec-rtc" },
{ .name = "ntxec-pwm" },
};
static const struct mfd_cell ntxec_subdev_pwm[] = {
{ .name = "ntxec-pwm" },
};
static int ntxec_probe(struct i2c_client *client)
{
struct ntxec *ec;
unsigned int version;
int res;
const struct mfd_cell *subdevs;
size_t n_subdevs;
ec = devm_kmalloc(&client->dev, sizeof(*ec), GFP_KERNEL);
if (!ec)
@ -137,6 +175,18 @@ static int ntxec_probe(struct i2c_client *client)
/* Bail out if we encounter an unknown firmware version */
switch (version) {
case NTXEC_VERSION_KOBO_AURA:
subdevs = ntxec_subdev;
n_subdevs = ARRAY_SIZE(ntxec_subdev);
break;
case NTXEC_VERSION_TOLINO_SHINE2:
subdevs = ntxec_subdev_pwm;
n_subdevs = ARRAY_SIZE(ntxec_subdev_pwm);
/* Another regmap stacked on top of the other */
ec->regmap = devm_regmap_init(ec->dev, NULL,
ec->regmap,
&regmap_config_noack);
if (IS_ERR(ec->regmap))
return PTR_ERR(ec->regmap);
break;
default:
dev_err(ec->dev,
@ -181,8 +231,8 @@ static int ntxec_probe(struct i2c_client *client)
i2c_set_clientdata(client, ec);
res = devm_mfd_add_devices(ec->dev, PLATFORM_DEVID_NONE, ntxec_subdevices,
ARRAY_SIZE(ntxec_subdevices), NULL, 0, NULL);
res = devm_mfd_add_devices(ec->dev, PLATFORM_DEVID_NONE,
subdevs, n_subdevs, NULL, 0, NULL);
if (res)
dev_err(ec->dev, "Failed to add subdevices: %d\n", res);

1
include/linux/mfd/ntxec.h
View file

@ -33,5 +33,6 @@ static inline __be16 ntxec_reg8(u8 value)
/* Known firmware versions */
#define NTXEC_VERSION_KOBO_AURA 0xd726 /* found in Kobo Aura */
#define NTXEC_VERSION_TOLINO_SHINE2 0xf110 /* found in Tolino Shine 2 HD */
#endif