Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756584Ab0D1WXR (ORCPT ); Wed, 28 Apr 2010 18:23:17 -0400 Received: from tex.lwn.net ([70.33.254.29]:48833 "EHLO vena.lwn.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757171Ab0D1WSQ (ORCPT ); Wed, 28 Apr 2010 18:18:16 -0400 From: Jonathan Corbet To: linux-kernel@vger.kernel.org Cc: Harald Welte , linux-fbdev@vger.kernel.org, JosephChan@via.com.tw, ScottFang@viatech.com.cn, Florian Tobias Schandinat Subject: [PATCH 11/30] viafb: Only establish i2c busses on ports that always had them Date: Wed, 28 Apr 2010 16:17:12 -0600 Message-Id: <1272493051-25380-12-git-send-email-corbet@lwn.net> X-Mailer: git-send-email 1.7.0.1 In-Reply-To: <1272493051-25380-1-git-send-email-corbet@lwn.net> References: <1272493051-25380-1-git-send-email-corbet@lwn.net> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2390 Lines: 69 ...otherwise it seems we run into conflicts with shadowy other users which don't expect to see i2c taking control of ports it never used to do anything with. Reported-by: Florian Tobias Schandinat Signed-off-by: Jonathan Corbet --- drivers/video/via/via_i2c.c | 19 +++++++++++++------ drivers/video/via/via_i2c.h | 1 + 2 files changed, 14 insertions(+), 6 deletions(-) diff --git a/drivers/video/via/via_i2c.c b/drivers/video/via/via_i2c.c index fe5535c..b5253e3 100644 --- a/drivers/video/via/via_i2c.c +++ b/drivers/video/via/via_i2c.c @@ -170,13 +170,18 @@ static int create_i2c_bus(struct i2c_adapter *adapter, return i2c_bit_add_bus(adapter); } +/* + * By default, we only activate busses on ports 2c and 31 to avoid + * conflicts with other possible users; that default can be changed + * below. + */ static struct via_i2c_adap_cfg adap_configs[] = { - [VIA_I2C_ADAP_26] = { VIA_I2C_I2C, VIASR, 0x26 }, - [VIA_I2C_ADAP_31] = { VIA_I2C_I2C, VIASR, 0x31 }, - [VIA_I2C_ADAP_25] = { VIA_I2C_GPIO, VIASR, 0x25 }, - [VIA_I2C_ADAP_2C] = { VIA_I2C_GPIO, VIASR, 0x2c }, - [VIA_I2C_ADAP_3D] = { VIA_I2C_GPIO, VIASR, 0x3d }, - { 0, 0, 0 } + [VIA_I2C_ADAP_26] = { VIA_I2C_I2C, VIASR, 0x26, 0 }, + [VIA_I2C_ADAP_31] = { VIA_I2C_I2C, VIASR, 0x31, 1 }, + [VIA_I2C_ADAP_25] = { VIA_I2C_GPIO, VIASR, 0x25, 0 }, + [VIA_I2C_ADAP_2C] = { VIA_I2C_GPIO, VIASR, 0x2c, 1 }, + [VIA_I2C_ADAP_3D] = { VIA_I2C_GPIO, VIASR, 0x3d, 0 }, + { 0, 0, 0, 0 } }; int viafb_create_i2c_busses(struct viafb_par *viapar) @@ -189,6 +194,8 @@ int viafb_create_i2c_busses(struct viafb_par *viapar) if (adap_cfg->type == 0) break; + if (!adap_cfg->is_active) + continue; ret = create_i2c_bus(&i2c_stuff->adapter, &i2c_stuff->algo, adap_cfg, diff --git a/drivers/video/via/via_i2c.h b/drivers/video/via/via_i2c.h index 00ed978..73d682f 100644 --- a/drivers/video/via/via_i2c.h +++ b/drivers/video/via/via_i2c.h @@ -35,6 +35,7 @@ struct via_i2c_adap_cfg { enum via_i2c_type type; u_int16_t io_port; u_int8_t ioport_index; + u8 is_active; }; struct via_i2c_stuff { -- 1.7.0.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/