From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932915AbbHIGr6 (ORCPT ); Sun, 9 Aug 2015 02:47:58 -0400 Received: from metis.ext.pengutronix.de ([92.198.50.35]:47354 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932877AbbHIGr5 (ORCPT ); Sun, 9 Aug 2015 02:47:57 -0400 Date: Sun, 9 Aug 2015 08:47:52 +0200 From: Markus Pargmann To: Jonathan Cameron Cc: Vlad Dogaru , Paul Bolle , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, kernel@pengutronix.de, Srinivas Pandruvada Subject: Re: [PATCH v2 1/6] iio: bmg160: Use i2c regmap instead of direct i2c access Message-ID: <20150809064752.GV19600@pengutronix.de> References: <1438686179-18635-1-git-send-email-mpa@pengutronix.de> <1438686179-18635-2-git-send-email-mpa@pengutronix.de> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="q/d9vTEvvdeKbPNw" Content-Disposition: inline In-Reply-To: <1438686179-18635-2-git-send-email-mpa@pengutronix.de> X-Sent-From: Pengutronix Hildesheim X-URL: http://www.pengutronix.de/ X-IRC: #ptxdist @freenode X-Accept-Language: de,en X-Accept-Content-Type: text/plain X-Uptime: 08:46:08 up 7 days, 10:20, 54 users, load average: 0.40, 0.41, 0.38 User-Agent: Mutt/1.5.23 (2014-03-12) X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::7 X-SA-Exim-Mail-From: mpa@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --q/d9vTEvvdeKbPNw Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Aug 04, 2015 at 01:02:54PM +0200, Markus Pargmann wrote: > This patch introduces regmap usage into the driver. This is done to > later easily support the SPI interface of this chip. >=20 > Signed-off-by: Markus Pargmann > --- > drivers/iio/gyro/Kconfig | 2 + > drivers/iio/gyro/bmg160.c | 200 +++++++++++++++++++++-------------------= ------ > 2 files changed, 91 insertions(+), 111 deletions(-) >=20 > diff --git a/drivers/iio/gyro/Kconfig b/drivers/iio/gyro/Kconfig > index 8d2439345673..b44984b3bb24 100644 > --- a/drivers/iio/gyro/Kconfig > +++ b/drivers/iio/gyro/Kconfig > @@ -55,6 +55,8 @@ config BMG160 > depends on I2C > select IIO_BUFFER > select IIO_TRIGGERED_BUFFER > + select REGMAP > + select REGMAP_I2C > help > Say yes here to build support for Bosch BMG160 Tri-axis Gyro Sensor > driver. This driver also supports BMI055 gyroscope. > diff --git a/drivers/iio/gyro/bmg160.c b/drivers/iio/gyro/bmg160.c > index 460bf715d541..626f5c98dde8 100644 > --- a/drivers/iio/gyro/bmg160.c > +++ b/drivers/iio/gyro/bmg160.c > @@ -28,6 +28,7 @@ > #include > #include > #include > +#include > =20 > #define BMG160_DRV_NAME "bmg160" > #define BMG160_IRQ_NAME "bmg160_event" > @@ -98,6 +99,7 @@ > =20 > struct bmg160_data { > struct i2c_client *client; > + struct regmap *regmap; > struct iio_trigger *dready_trig; > struct iio_trigger *motion_trig; > struct mutex mutex; > @@ -134,12 +136,19 @@ static const struct { > { 133, BMG160_RANGE_250DPS}, > { 66, BMG160_RANGE_125DPS} }; > =20 > +struct regmap_config bmg160_regmap_i2c_conf =3D { > + .reg_bits =3D 8, > + .val_bits =3D 8, > + > + .use_single_rw =3D true, This should not be necessary, we should be able to read multiple registers at once. This is the same for the spi regmap config. Also a max_register is missing. Will fix it. Regards, Markus > + .cache_type =3D REGCACHE_NONE, > +}; > + > static int bmg160_set_mode(struct bmg160_data *data, u8 mode) > { > int ret; > =20 > - ret =3D i2c_smbus_write_byte_data(data->client, > - BMG160_REG_PMU_LPW, mode); > + ret =3D regmap_write(data->regmap, BMG160_REG_PMU_LPW, mode); > if (ret < 0) { > dev_err(&data->client->dev, "Error writing reg_pmu_lpw\n"); > return ret; > @@ -169,8 +178,7 @@ static int bmg160_set_bw(struct bmg160_data *data, in= t val) > if (bw_bits < 0) > return bw_bits; > =20 > - ret =3D i2c_smbus_write_byte_data(data->client, BMG160_REG_PMU_BW, > - bw_bits); > + ret =3D regmap_write(data->regmap, BMG160_REG_PMU_BW, bw_bits); > if (ret < 0) { > dev_err(&data->client->dev, "Error writing reg_pmu_bw\n"); > return ret; > @@ -184,16 +192,17 @@ static int bmg160_set_bw(struct bmg160_data *data, = int val) > static int bmg160_chip_init(struct bmg160_data *data) > { > int ret; > + unsigned int val; > =20 > - ret =3D i2c_smbus_read_byte_data(data->client, BMG160_REG_CHIP_ID); > + ret =3D regmap_read(data->regmap, BMG160_REG_CHIP_ID, &val); > if (ret < 0) { > dev_err(&data->client->dev, "Error reading reg_chip_id\n"); > return ret; > } > =20 > - dev_dbg(&data->client->dev, "Chip Id %x\n", ret); > - if (ret !=3D BMG160_CHIP_ID_VAL) { > - dev_err(&data->client->dev, "invalid chip %x\n", ret); > + dev_dbg(&data->client->dev, "Chip Id %x\n", val); > + if (val !=3D BMG160_CHIP_ID_VAL) { > + dev_err(&data->client->dev, "invalid chip %x\n", val); > return -ENODEV; > } > =20 > @@ -210,40 +219,31 @@ static int bmg160_chip_init(struct bmg160_data *dat= a) > return ret; > =20 > /* Set Default Range */ > - ret =3D i2c_smbus_write_byte_data(data->client, > - BMG160_REG_RANGE, > - BMG160_RANGE_500DPS); > + ret =3D regmap_write(data->regmap, BMG160_REG_RANGE, BMG160_RANGE_500DP= S); > if (ret < 0) { > dev_err(&data->client->dev, "Error writing reg_range\n"); > return ret; > } > data->dps_range =3D BMG160_RANGE_500DPS; > =20 > - ret =3D i2c_smbus_read_byte_data(data->client, BMG160_REG_SLOPE_THRES); > + ret =3D regmap_read(data->regmap, BMG160_REG_SLOPE_THRES, &val); > if (ret < 0) { > dev_err(&data->client->dev, "Error reading reg_slope_thres\n"); > return ret; > } > - data->slope_thres =3D ret; > + data->slope_thres =3D val; > =20 > /* Set default interrupt mode */ > - ret =3D i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_EN_1); > - if (ret < 0) { > - dev_err(&data->client->dev, "Error reading reg_int_en_1\n"); > - return ret; > - } > - ret &=3D ~BMG160_INT1_BIT_OD; > - ret =3D i2c_smbus_write_byte_data(data->client, > - BMG160_REG_INT_EN_1, ret); > + ret =3D regmap_update_bits(data->regmap, BMG160_REG_INT_EN_1, > + BMG160_INT1_BIT_OD, 0); > if (ret < 0) { > - dev_err(&data->client->dev, "Error writing reg_int_en_1\n"); > + dev_err(&data->client->dev, "Error updating bits in reg_int_en_1\n"); > return ret; > } > =20 > - ret =3D i2c_smbus_write_byte_data(data->client, > - BMG160_REG_INT_RST_LATCH, > - BMG160_INT_MODE_LATCH_INT | > - BMG160_INT_MODE_LATCH_RESET); > + ret =3D regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH, > + BMG160_INT_MODE_LATCH_INT | > + BMG160_INT_MODE_LATCH_RESET); > if (ret < 0) { > dev_err(&data->client->dev, > "Error writing reg_motion_intr\n"); > @@ -284,41 +284,28 @@ static int bmg160_setup_any_motion_interrupt(struct= bmg160_data *data, > int ret; > =20 > /* Enable/Disable INT_MAP0 mapping */ > - ret =3D i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_MAP_0); > - if (ret < 0) { > - dev_err(&data->client->dev, "Error reading reg_int_map0\n"); > - return ret; > - } > - if (status) > - ret |=3D BMG160_INT_MAP_0_BIT_ANY; > - else > - ret &=3D ~BMG160_INT_MAP_0_BIT_ANY; > - > - ret =3D i2c_smbus_write_byte_data(data->client, > - BMG160_REG_INT_MAP_0, > - ret); > + ret =3D regmap_update_bits(data->regmap, BMG160_REG_INT_MAP_0, > + BMG160_INT_MAP_0_BIT_ANY, > + (status ? BMG160_INT_MAP_0_BIT_ANY : 0)); > if (ret < 0) { > - dev_err(&data->client->dev, "Error writing reg_int_map0\n"); > + dev_err(&data->client->dev, "Error updating bits reg_int_map0\n"); > return ret; > } > =20 > /* Enable/Disable slope interrupts */ > if (status) { > /* Update slope thres */ > - ret =3D i2c_smbus_write_byte_data(data->client, > - BMG160_REG_SLOPE_THRES, > - data->slope_thres); > + ret =3D regmap_write(data->regmap, BMG160_REG_SLOPE_THRES, > + data->slope_thres); > if (ret < 0) { > dev_err(&data->client->dev, > "Error writing reg_slope_thres\n"); > return ret; > } > =20 > - ret =3D i2c_smbus_write_byte_data(data->client, > - BMG160_REG_MOTION_INTR, > - BMG160_INT_MOTION_X | > - BMG160_INT_MOTION_Y | > - BMG160_INT_MOTION_Z); > + ret =3D regmap_write(data->regmap, BMG160_REG_MOTION_INTR, > + BMG160_INT_MOTION_X | BMG160_INT_MOTION_Y | > + BMG160_INT_MOTION_Z); > if (ret < 0) { > dev_err(&data->client->dev, > "Error writing reg_motion_intr\n"); > @@ -331,10 +318,10 @@ static int bmg160_setup_any_motion_interrupt(struct= bmg160_data *data, > * to set latched mode, we will be flooded anyway with INTR > */ > if (!data->dready_trigger_on) { > - ret =3D i2c_smbus_write_byte_data(data->client, > - BMG160_REG_INT_RST_LATCH, > - BMG160_INT_MODE_LATCH_INT | > - BMG160_INT_MODE_LATCH_RESET); > + ret =3D regmap_write(data->regmap, > + BMG160_REG_INT_RST_LATCH, > + BMG160_INT_MODE_LATCH_INT | > + BMG160_INT_MODE_LATCH_RESET); > if (ret < 0) { > dev_err(&data->client->dev, > "Error writing reg_rst_latch\n"); > @@ -342,14 +329,12 @@ static int bmg160_setup_any_motion_interrupt(struct= bmg160_data *data, > } > } > =20 > - ret =3D i2c_smbus_write_byte_data(data->client, > - BMG160_REG_INT_EN_0, > - BMG160_DATA_ENABLE_INT); > + ret =3D regmap_write(data->regmap, BMG160_REG_INT_EN_0, > + BMG160_DATA_ENABLE_INT); > =20 > - } else > - ret =3D i2c_smbus_write_byte_data(data->client, > - BMG160_REG_INT_EN_0, > - 0); > + } else { > + ret =3D regmap_write(data->regmap, BMG160_REG_INT_EN_0, 0); > + } > =20 > if (ret < 0) { > dev_err(&data->client->dev, "Error writing reg_int_en0\n"); > @@ -365,55 +350,39 @@ static int bmg160_setup_new_data_interrupt(struct b= mg160_data *data, > int ret; > =20 > /* Enable/Disable INT_MAP1 mapping */ > - ret =3D i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_MAP_1); > - if (ret < 0) { > - dev_err(&data->client->dev, "Error reading reg_int_map1\n"); > - return ret; > - } > - > - if (status) > - ret |=3D BMG160_INT_MAP_1_BIT_NEW_DATA; > - else > - ret &=3D ~BMG160_INT_MAP_1_BIT_NEW_DATA; > - > - ret =3D i2c_smbus_write_byte_data(data->client, > - BMG160_REG_INT_MAP_1, > - ret); > + ret =3D regmap_update_bits(data->regmap, BMG160_REG_INT_MAP_1, > + BMG160_INT_MAP_1_BIT_NEW_DATA, > + (status ? BMG160_INT_MAP_1_BIT_NEW_DATA : 0)); > if (ret < 0) { > - dev_err(&data->client->dev, "Error writing reg_int_map1\n"); > + dev_err(&data->client->dev, "Error updating bits in reg_int_map1\n"); > return ret; > } > =20 > if (status) { > - ret =3D i2c_smbus_write_byte_data(data->client, > - BMG160_REG_INT_RST_LATCH, > - BMG160_INT_MODE_NON_LATCH_INT | > - BMG160_INT_MODE_LATCH_RESET); > + ret =3D regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH, > + BMG160_INT_MODE_NON_LATCH_INT | > + BMG160_INT_MODE_LATCH_RESET); > if (ret < 0) { > dev_err(&data->client->dev, > "Error writing reg_rst_latch\n"); > return ret; > } > =20 > - ret =3D i2c_smbus_write_byte_data(data->client, > - BMG160_REG_INT_EN_0, > - BMG160_DATA_ENABLE_INT); > + ret =3D regmap_write(data->regmap, BMG160_REG_INT_EN_0, > + BMG160_DATA_ENABLE_INT); > =20 > } else { > /* Restore interrupt mode */ > - ret =3D i2c_smbus_write_byte_data(data->client, > - BMG160_REG_INT_RST_LATCH, > - BMG160_INT_MODE_LATCH_INT | > - BMG160_INT_MODE_LATCH_RESET); > + ret =3D regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH, > + BMG160_INT_MODE_LATCH_INT | > + BMG160_INT_MODE_LATCH_RESET); > if (ret < 0) { > dev_err(&data->client->dev, > "Error writing reg_rst_latch\n"); > return ret; > } > =20 > - ret =3D i2c_smbus_write_byte_data(data->client, > - BMG160_REG_INT_EN_0, > - 0); > + ret =3D regmap_write(data->regmap, BMG160_REG_INT_EN_0, 0); > } > =20 > if (ret < 0) { > @@ -444,10 +413,8 @@ static int bmg160_set_scale(struct bmg160_data *data= , int val) > =20 > for (i =3D 0; i < ARRAY_SIZE(bmg160_scale_table); ++i) { > if (bmg160_scale_table[i].scale =3D=3D val) { > - ret =3D i2c_smbus_write_byte_data( > - data->client, > - BMG160_REG_RANGE, > - bmg160_scale_table[i].dps_range); > + ret =3D regmap_write(data->regmap, BMG160_REG_RANGE, > + bmg160_scale_table[i].dps_range); > if (ret < 0) { > dev_err(&data->client->dev, > "Error writing reg_range\n"); > @@ -464,6 +431,7 @@ static int bmg160_set_scale(struct bmg160_data *data,= int val) > static int bmg160_get_temp(struct bmg160_data *data, int *val) > { > int ret; > + unsigned int raw_val; > =20 > mutex_lock(&data->mutex); > ret =3D bmg160_set_power_state(data, true); > @@ -472,7 +440,7 @@ static int bmg160_get_temp(struct bmg160_data *data, = int *val) > return ret; > } > =20 > - ret =3D i2c_smbus_read_byte_data(data->client, BMG160_REG_TEMP); > + ret =3D regmap_read(data->regmap, BMG160_REG_TEMP, &raw_val); > if (ret < 0) { > dev_err(&data->client->dev, "Error reading reg_temp\n"); > bmg160_set_power_state(data, false); > @@ -480,7 +448,7 @@ static int bmg160_get_temp(struct bmg160_data *data, = int *val) > return ret; > } > =20 > - *val =3D sign_extend32(ret, 7); > + *val =3D sign_extend32(raw_val, 7); > ret =3D bmg160_set_power_state(data, false); > mutex_unlock(&data->mutex); > if (ret < 0) > @@ -492,6 +460,7 @@ static int bmg160_get_temp(struct bmg160_data *data, = int *val) > static int bmg160_get_axis(struct bmg160_data *data, int axis, int *val) > { > int ret; > + unsigned int raw_val; > =20 > mutex_lock(&data->mutex); > ret =3D bmg160_set_power_state(data, true); > @@ -500,7 +469,8 @@ static int bmg160_get_axis(struct bmg160_data *data, = int axis, int *val) > return ret; > } > =20 > - ret =3D i2c_smbus_read_word_data(data->client, BMG160_AXIS_TO_REG(axis)= ); > + ret =3D regmap_bulk_read(data->regmap, BMG160_AXIS_TO_REG(axis), &raw_v= al, > + 2); > if (ret < 0) { > dev_err(&data->client->dev, "Error reading axis %d\n", axis); > bmg160_set_power_state(data, false); > @@ -508,7 +478,7 @@ static int bmg160_get_axis(struct bmg160_data *data, = int axis, int *val) > return ret; > } > =20 > - *val =3D sign_extend32(ret, 15); > + *val =3D sign_extend32(raw_val, 15); > ret =3D bmg160_set_power_state(data, false); > mutex_unlock(&data->mutex); > if (ret < 0) > @@ -807,12 +777,13 @@ static irqreturn_t bmg160_trigger_handler(int irq, = void *p) > struct iio_dev *indio_dev =3D pf->indio_dev; > struct bmg160_data *data =3D iio_priv(indio_dev); > int bit, ret, i =3D 0; > + unsigned int val; > =20 > mutex_lock(&data->mutex); > for_each_set_bit(bit, indio_dev->active_scan_mask, > indio_dev->masklength) { > - ret =3D i2c_smbus_read_word_data(data->client, > - BMG160_AXIS_TO_REG(bit)); > + ret =3D regmap_bulk_read(data->regmap, BMG160_AXIS_TO_REG(bit), > + &val, 2); > if (ret < 0) { > mutex_unlock(&data->mutex); > goto err; > @@ -840,10 +811,9 @@ static int bmg160_trig_try_reen(struct iio_trigger *= trig) > return 0; > =20 > /* Set latched mode interrupt and clear any latched interrupt */ > - ret =3D i2c_smbus_write_byte_data(data->client, > - BMG160_REG_INT_RST_LATCH, > - BMG160_INT_MODE_LATCH_INT | > - BMG160_INT_MODE_LATCH_RESET); > + ret =3D regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH, > + BMG160_INT_MODE_LATCH_INT | > + BMG160_INT_MODE_LATCH_RESET); > if (ret < 0) { > dev_err(&data->client->dev, "Error writing reg_rst_latch\n"); > return ret; > @@ -907,33 +877,34 @@ static irqreturn_t bmg160_event_handler(int irq, vo= id *private) > struct bmg160_data *data =3D iio_priv(indio_dev); > int ret; > int dir; > + unsigned int val; > =20 > - ret =3D i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_STATUS_2); > + ret =3D regmap_read(data->regmap, BMG160_REG_INT_STATUS_2, &val); > if (ret < 0) { > dev_err(&data->client->dev, "Error reading reg_int_status2\n"); > goto ack_intr_status; > } > =20 > - if (ret & 0x08) > + if (val & 0x08) > dir =3D IIO_EV_DIR_RISING; > else > dir =3D IIO_EV_DIR_FALLING; > =20 > - if (ret & BMG160_ANY_MOTION_BIT_X) > + if (val & BMG160_ANY_MOTION_BIT_X) > iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ANGL_VEL, > 0, > IIO_MOD_X, > IIO_EV_TYPE_ROC, > dir), > iio_get_time_ns()); > - if (ret & BMG160_ANY_MOTION_BIT_Y) > + if (val & BMG160_ANY_MOTION_BIT_Y) > iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ANGL_VEL, > 0, > IIO_MOD_Y, > IIO_EV_TYPE_ROC, > dir), > iio_get_time_ns()); > - if (ret & BMG160_ANY_MOTION_BIT_Z) > + if (val & BMG160_ANY_MOTION_BIT_Z) > iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ANGL_VEL, > 0, > IIO_MOD_Z, > @@ -943,10 +914,9 @@ static irqreturn_t bmg160_event_handler(int irq, voi= d *private) > =20 > ack_intr_status: > if (!data->dready_trigger_on) { > - ret =3D i2c_smbus_write_byte_data(data->client, > - BMG160_REG_INT_RST_LATCH, > - BMG160_INT_MODE_LATCH_INT | > - BMG160_INT_MODE_LATCH_RESET); > + ret =3D regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH, > + BMG160_INT_MODE_LATCH_INT | > + BMG160_INT_MODE_LATCH_RESET); > if (ret < 0) > dev_err(&data->client->dev, > "Error writing reg_rst_latch\n"); > @@ -1038,6 +1008,14 @@ static int bmg160_probe(struct i2c_client *client, > struct iio_dev *indio_dev; > int ret; > const char *name =3D NULL; > + struct regmap *regmap; > + > + regmap =3D devm_regmap_init_i2c(client, &bmg160_regmap_i2c_conf); > + if (IS_ERR(regmap)) { > + dev_err(&client->dev, "Failed to register i2c regmap %d\n", > + (int)PTR_ERR(regmap)); > + return PTR_ERR(regmap); > + } > =20 > indio_dev =3D devm_iio_device_alloc(&client->dev, sizeof(*data)); > if (!indio_dev) > --=20 > 2.1.4 >=20 >=20 >=20 --=20 Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | --q/d9vTEvvdeKbPNw Content-Type: application/pgp-signature; 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