From: Peter Rosin <peda@axentia.se>
To: <linux-kernel@vger.kernel.org>
Cc: Peter Rosin <peda@axentia.se>, Wolfram Sang <wsa@the-dreams.de>,
Jonathan Corbet <corbet@lwn.net>,
Peter Korsgaard <peter.korsgaard@barco.com>,
Guenter Roeck <linux@roeck-us.net>,
Jonathan Cameron <jic23@kernel.org>,
Hartmut Knaack <knaack.h@gmx.de>,
Lars-Peter Clausen <lars@metafoo.de>,
Peter Meerwald <pmeerw@pmeerw.net>,
Antti Palosaari <crope@iki.fi>,
Mauro Carvalho Chehab <mchehab@osg.samsung.com>,
Rob Herring <robh+dt@kernel.org>,
Frank Rowand <frowand.list@gmail.com>,
Grant Likely <grant.likely@linaro.org>,
Andrew Morton <akpm@linux-foundation.org>,
"David S. Miller" <davem@davemloft.net>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Kalle Valo <kvalo@codeaurora.org>, Jiri Slaby <jslaby@suse.com>,
Daniel Baluta <daniel.baluta@intel.com>,
Lucas De Marchi <lucas.demarchi@intel.com>,
Adriana Reus <adriana.reus@intel.com>,
Matt Ranostay <matt.ranostay@intel.com>,
Krzysztof Kozlowski <k.kozlowski@samsung.com>,
Hans Verkuil <hans.verkuil@cisco.com>,
Terry Heo <terryheo@google.com>, Arnd Bergmann <arnd@arndb.de>,
Tommi Rantala <tt.rantala@gmail.com>,
Crestez Dan Leonard <leonard.crestez@intel.com>,
<linux-i2c@vger.kernel.org>, <linux-doc@vger.kernel.org>,
<linux-iio@vger.kernel.org>, <linux-media@vger.kernel.org>,
<devicetree@vger.kernel.org>, Peter Rosin <peda@lysator.liu.se>
Subject: [PATCH v7 06/24] i2c: i2c-mux-pca954x: convert to use an explicit i2c mux core
Date: Wed, 20 Apr 2016 17:17:46 +0200 [thread overview]
Message-ID: <1461165484-2314-7-git-send-email-peda@axentia.se> (raw)
In-Reply-To: <1461165484-2314-1-git-send-email-peda@axentia.se>
Allocate an explicit i2c mux core to handle parent and child adapters
etc. Update the select/deselect ops to be in terms of the i2c mux core
instead of the child adapter.
Add a mask to handle the case where not all child adapters should
cause a mux deselect to happen, now that there is a common deselect op
for all child adapters.
Signed-off-by: Peter Rosin <peda@axentia.se>
---
drivers/i2c/muxes/i2c-mux-pca954x.c | 61 ++++++++++++++++++-------------------
1 file changed, 30 insertions(+), 31 deletions(-)
diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c
index acfcef3d4068..528e755c468f 100644
--- a/drivers/i2c/muxes/i2c-mux-pca954x.c
+++ b/drivers/i2c/muxes/i2c-mux-pca954x.c
@@ -60,9 +60,10 @@ enum pca_type {
struct pca954x {
enum pca_type type;
- struct i2c_adapter *virt_adaps[PCA954X_MAX_NCHANS];
u8 last_chan; /* last register value */
+ u8 deselect;
+ struct i2c_client *client;
};
struct chip_desc {
@@ -146,10 +147,10 @@ static int pca954x_reg_write(struct i2c_adapter *adap,
return ret;
}
-static int pca954x_select_chan(struct i2c_adapter *adap,
- void *client, u32 chan)
+static int pca954x_select_chan(struct i2c_mux_core *muxc, u32 chan)
{
- struct pca954x *data = i2c_get_clientdata(client);
+ struct pca954x *data = i2c_mux_priv(muxc);
+ struct i2c_client *client = data->client;
const struct chip_desc *chip = &chips[data->type];
u8 regval;
int ret = 0;
@@ -162,21 +163,24 @@ static int pca954x_select_chan(struct i2c_adapter *adap,
/* Only select the channel if its different from the last channel */
if (data->last_chan != regval) {
- ret = pca954x_reg_write(adap, client, regval);
+ ret = pca954x_reg_write(muxc->parent, client, regval);
data->last_chan = regval;
}
return ret;
}
-static int pca954x_deselect_mux(struct i2c_adapter *adap,
- void *client, u32 chan)
+static int pca954x_deselect_mux(struct i2c_mux_core *muxc, u32 chan)
{
- struct pca954x *data = i2c_get_clientdata(client);
+ struct pca954x *data = i2c_mux_priv(muxc);
+ struct i2c_client *client = data->client;
+
+ if (!(data->deselect & (1 << chan)))
+ return 0;
/* Deselect active channel */
data->last_chan = 0;
- return pca954x_reg_write(adap, client, data->last_chan);
+ return pca954x_reg_write(muxc->parent, client, data->last_chan);
}
/*
@@ -191,17 +195,22 @@ static int pca954x_probe(struct i2c_client *client,
bool idle_disconnect_dt;
struct gpio_desc *gpio;
int num, force, class;
+ struct i2c_mux_core *muxc;
struct pca954x *data;
int ret;
if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_BYTE))
return -ENODEV;
- data = devm_kzalloc(&client->dev, sizeof(struct pca954x), GFP_KERNEL);
- if (!data)
+ muxc = i2c_mux_alloc(adap, &client->dev,
+ PCA954X_MAX_NCHANS, sizeof(*data), 0,
+ pca954x_select_chan, pca954x_deselect_mux);
+ if (!muxc)
return -ENOMEM;
+ data = i2c_mux_priv(muxc);
- i2c_set_clientdata(client, data);
+ i2c_set_clientdata(client, muxc);
+ data->client = client;
/* Get the mux out of reset if a reset GPIO is specified. */
gpio = devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_LOW);
@@ -238,16 +247,13 @@ static int pca954x_probe(struct i2c_client *client,
/* discard unconfigured channels */
break;
idle_disconnect_pd = pdata->modes[num].deselect_on_exit;
+ data->deselect |= (idle_disconnect_pd
+ || idle_disconnect_dt) << num;
}
- data->virt_adaps[num] =
- i2c_add_mux_adapter(adap, &client->dev, client,
- force, num, class, pca954x_select_chan,
- (idle_disconnect_pd || idle_disconnect_dt)
- ? pca954x_deselect_mux : NULL);
+ ret = i2c_mux_add_adapter(muxc, force, num, class);
- if (data->virt_adaps[num] == NULL) {
- ret = -ENODEV;
+ if (ret) {
dev_err(&client->dev,
"failed to register multiplexed adapter"
" %d as bus %d\n", num, force);
@@ -263,23 +269,15 @@ static int pca954x_probe(struct i2c_client *client,
return 0;
virt_reg_failed:
- for (num--; num >= 0; num--)
- i2c_del_mux_adapter(data->virt_adaps[num]);
+ i2c_mux_del_adapters(muxc);
return ret;
}
static int pca954x_remove(struct i2c_client *client)
{
- struct pca954x *data = i2c_get_clientdata(client);
- const struct chip_desc *chip = &chips[data->type];
- int i;
-
- for (i = 0; i < chip->nchans; ++i)
- if (data->virt_adaps[i]) {
- i2c_del_mux_adapter(data->virt_adaps[i]);
- data->virt_adaps[i] = NULL;
- }
+ struct i2c_mux_core *muxc = i2c_get_clientdata(client);
+ i2c_mux_del_adapters(muxc);
return 0;
}
@@ -287,7 +285,8 @@ static int pca954x_remove(struct i2c_client *client)
static int pca954x_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
- struct pca954x *data = i2c_get_clientdata(client);
+ struct i2c_mux_core *muxc = i2c_get_clientdata(client);
+ struct pca954x *data = i2c_mux_priv(muxc);
data->last_chan = 0;
return i2c_smbus_write_byte(client, 0);
--
2.1.4
next prev parent reply other threads:[~2016-04-20 15:19 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-20 15:17 [PATCH v7 00/24] i2c mux cleanup and locking update Peter Rosin
2016-04-20 15:17 ` [PATCH v7 01/24] i2c-mux: add common data for every i2c-mux instance Peter Rosin
2016-04-20 15:17 ` [PATCH v7 02/24] i2c: i2c-mux-gpio: convert to use an explicit i2c mux core Peter Rosin
2016-04-20 15:17 ` [PATCH v7 03/24] i2c: i2c-mux-pinctrl: " Peter Rosin
2016-04-20 15:17 ` [PATCH v7 04/24] i2c: i2c-arb-gpio-challenge: " Peter Rosin
2016-04-20 15:17 ` [PATCH v7 05/24] i2c: i2c-mux-pca9541: " Peter Rosin
2016-04-20 15:17 ` Peter Rosin [this message]
2016-04-20 15:17 ` [PATCH v7 07/24] i2c: i2c-mux-reg: " Peter Rosin
2016-04-20 15:17 ` [PATCH v7 08/24] iio: imu: inv_mpu6050: " Peter Rosin
2016-04-22 11:37 ` [PATCH v8 " Peter Rosin
2016-04-20 15:17 ` [PATCH v7 09/24] [media] m88ds3103: " Peter Rosin
2016-04-20 15:17 ` [PATCH v7 10/24] [media] rtl2830: " Peter Rosin
2016-04-20 15:17 ` [PATCH v7 11/24] [media] rtl2832: " Peter Rosin
2016-04-20 15:17 ` [PATCH v7 12/24] [media] si2168: " Peter Rosin
2016-04-20 15:17 ` [PATCH v7 13/24] [media] cx231xx: " Peter Rosin
2016-04-20 15:17 ` [PATCH v7 14/24] of/unittest: " Peter Rosin
2016-04-20 15:17 ` [PATCH v7 15/24] i2c-mux: drop old unused i2c-mux api Peter Rosin
2016-04-20 15:17 ` [PATCH v7 16/24] i2c: allow adapter drivers to override the adapter locking Peter Rosin
2016-04-28 20:50 ` Wolfram Sang
2016-04-28 21:08 ` Peter Rosin
2016-04-29 7:16 ` Wolfram Sang
2016-04-29 9:16 ` Peter Rosin
2016-05-02 19:20 ` Antti Palosaari
2016-05-03 21:39 ` Wolfram Sang
2016-05-04 14:10 ` Peter Rosin
2016-05-04 16:38 ` Wolfram Sang
2016-05-03 21:38 ` Wolfram Sang
2016-05-04 10:01 ` Peter Rosin
2016-05-04 12:07 ` Wolfram Sang
2016-04-20 15:17 ` [PATCH v7 17/24] i2c: muxes always lock the parent adapter Peter Rosin
2016-04-20 15:17 ` [PATCH v7 18/24] i2c-mux: relax locking of the top i2c adapter during mux-locked muxing Peter Rosin
2016-05-03 21:38 ` Wolfram Sang
2016-04-20 15:17 ` [PATCH v7 19/24] i2c-mux: document i2c muxes and elaborate on parent-/mux-locked muxes Peter Rosin
2016-04-20 15:18 ` [PATCH v7 20/24] iio: imu: inv_mpu6050: change the i2c gate to be mux-locked Peter Rosin
2016-04-20 15:18 ` [PATCH v7 21/24] [media] si2168: " Peter Rosin
2016-04-20 15:18 ` [PATCH v7 22/24] [media] rtl2832: " Peter Rosin
2016-04-28 21:47 ` Wolfram Sang
2016-04-29 4:41 ` Peter Rosin
2016-04-29 6:57 ` Wolfram Sang
2016-04-20 15:18 ` [PATCH v7 23/24] [media] rtl2832_sdr: get rid of empty regmap wrappers Peter Rosin
2016-04-20 15:18 ` [PATCH v7 24/24] [media] rtl2832: regmap is aware of lockdep, drop local locking hack Peter Rosin
2016-04-20 20:52 ` [PATCH v7 00/24] i2c mux cleanup and locking update Wolfram Sang
2016-04-21 1:10 ` Antti Palosaari
2016-04-21 12:33 ` Crestez Dan Leonard
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