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1039 lines
26 KiB
1039 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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// |
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// em28xx-i2c.c - driver for Empia EM2800/EM2820/2840 USB video capture devices |
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// |
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// Copyright (C) 2005 Ludovico Cavedon <[email protected]> |
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// Markus Rechberger <[email protected]> |
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// Mauro Carvalho Chehab <[email protected]> |
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// Sascha Sommer <[email protected]> |
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// Copyright (C) 2013 Frank Schäfer <[email protected]> |
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// |
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// This program is free software; you can redistribute it and/or modify |
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// it under the terms of the GNU General Public License as published by |
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// the Free Software Foundation; either version 2 of the License, or |
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// (at your option) any later version. |
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// |
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// This program is distributed in the hope that it will be useful, |
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// but WITHOUT ANY WARRANTY; without even the implied warranty of |
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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// GNU General Public License for more details. |
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#include "em28xx.h" |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/usb.h> |
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#include <linux/i2c.h> |
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#include <linux/jiffies.h> |
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#include "tuner-xc2028.h" |
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#include <media/v4l2-common.h> |
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#include <media/tuner.h> |
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/* ----------------------------------------------------------- */ |
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static unsigned int i2c_scan; |
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module_param(i2c_scan, int, 0444); |
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MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time"); |
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static unsigned int i2c_debug; |
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module_param(i2c_debug, int, 0644); |
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MODULE_PARM_DESC(i2c_debug, "i2c debug message level (1: normal debug, 2: show I2C transfers)"); |
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#define dprintk(level, fmt, arg...) do { \ |
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if (i2c_debug > level) \ |
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dev_printk(KERN_DEBUG, &dev->intf->dev, \ |
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"i2c: %s: " fmt, __func__, ## arg); \ |
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} while (0) |
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/* |
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* Time in msecs to wait for i2c xfers to finish. |
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* 35ms is the maximum time a SMBUS device could wait when |
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* clock stretching is used. As the transfer itself will take |
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* some time to happen, set it to 35 ms. |
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* |
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* Ok, I2C doesn't specify any limit. So, eventually, we may need |
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* to increase this timeout. |
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*/ |
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#define EM28XX_I2C_XFER_TIMEOUT 35 /* ms */ |
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static int em28xx_i2c_timeout(struct em28xx *dev) |
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{ |
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int time = EM28XX_I2C_XFER_TIMEOUT; |
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switch (dev->i2c_speed & 0x03) { |
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case EM28XX_I2C_FREQ_25_KHZ: |
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time += 4; /* Assume 4 ms for transfers */ |
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break; |
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case EM28XX_I2C_FREQ_100_KHZ: |
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case EM28XX_I2C_FREQ_400_KHZ: |
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time += 1; /* Assume 1 ms for transfers */ |
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break; |
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default: /* EM28XX_I2C_FREQ_1_5_MHZ */ |
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break; |
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} |
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return msecs_to_jiffies(time); |
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} |
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/* |
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* em2800_i2c_send_bytes() |
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* send up to 4 bytes to the em2800 i2c device |
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*/ |
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static int em2800_i2c_send_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len) |
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{ |
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unsigned long timeout = jiffies + em28xx_i2c_timeout(dev); |
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int ret; |
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u8 b2[6]; |
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if (len < 1 || len > 4) |
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return -EOPNOTSUPP; |
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b2[5] = 0x80 + len - 1; |
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b2[4] = addr; |
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b2[3] = buf[0]; |
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if (len > 1) |
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b2[2] = buf[1]; |
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if (len > 2) |
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b2[1] = buf[2]; |
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if (len > 3) |
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b2[0] = buf[3]; |
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/* trigger write */ |
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ret = dev->em28xx_write_regs(dev, 4 - len, &b2[4 - len], 2 + len); |
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if (ret != 2 + len) { |
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dev_warn(&dev->intf->dev, |
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"failed to trigger write to i2c address 0x%x (error=%i)\n", |
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addr, ret); |
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return (ret < 0) ? ret : -EIO; |
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} |
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/* wait for completion */ |
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while (time_is_after_jiffies(timeout)) { |
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ret = dev->em28xx_read_reg(dev, 0x05); |
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if (ret == 0x80 + len - 1) |
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return len; |
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if (ret == 0x94 + len - 1) { |
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dprintk(1, "R05 returned 0x%02x: I2C ACK error\n", ret); |
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return -ENXIO; |
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} |
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if (ret < 0) { |
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dev_warn(&dev->intf->dev, |
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"failed to get i2c transfer status from bridge register (error=%i)\n", |
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ret); |
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return ret; |
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} |
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usleep_range(5000, 6000); |
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} |
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dprintk(0, "write to i2c device at 0x%x timed out\n", addr); |
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return -ETIMEDOUT; |
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} |
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/* |
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* em2800_i2c_recv_bytes() |
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* read up to 4 bytes from the em2800 i2c device |
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*/ |
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static int em2800_i2c_recv_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len) |
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{ |
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unsigned long timeout = jiffies + em28xx_i2c_timeout(dev); |
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u8 buf2[4]; |
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int ret; |
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int i; |
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if (len < 1 || len > 4) |
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return -EOPNOTSUPP; |
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/* trigger read */ |
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buf2[1] = 0x84 + len - 1; |
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buf2[0] = addr; |
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ret = dev->em28xx_write_regs(dev, 0x04, buf2, 2); |
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if (ret != 2) { |
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dev_warn(&dev->intf->dev, |
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"failed to trigger read from i2c address 0x%x (error=%i)\n", |
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addr, ret); |
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return (ret < 0) ? ret : -EIO; |
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} |
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/* wait for completion */ |
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while (time_is_after_jiffies(timeout)) { |
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ret = dev->em28xx_read_reg(dev, 0x05); |
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if (ret == 0x84 + len - 1) |
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break; |
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if (ret == 0x94 + len - 1) { |
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dprintk(1, "R05 returned 0x%02x: I2C ACK error\n", |
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ret); |
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return -ENXIO; |
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} |
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if (ret < 0) { |
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dev_warn(&dev->intf->dev, |
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"failed to get i2c transfer status from bridge register (error=%i)\n", |
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ret); |
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return ret; |
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} |
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usleep_range(5000, 6000); |
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} |
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if (ret != 0x84 + len - 1) |
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dprintk(0, "read from i2c device at 0x%x timed out\n", addr); |
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/* get the received message */ |
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ret = dev->em28xx_read_reg_req_len(dev, 0x00, 4 - len, buf2, len); |
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if (ret != len) { |
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dev_warn(&dev->intf->dev, |
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"reading from i2c device at 0x%x failed: couldn't get the received message from the bridge (error=%i)\n", |
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addr, ret); |
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return (ret < 0) ? ret : -EIO; |
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} |
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for (i = 0; i < len; i++) |
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buf[i] = buf2[len - 1 - i]; |
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return ret; |
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} |
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/* |
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* em2800_i2c_check_for_device() |
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* check if there is an i2c device at the supplied address |
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*/ |
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static int em2800_i2c_check_for_device(struct em28xx *dev, u8 addr) |
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{ |
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u8 buf; |
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int ret; |
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ret = em2800_i2c_recv_bytes(dev, addr, &buf, 1); |
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if (ret == 1) |
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return 0; |
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return (ret < 0) ? ret : -EIO; |
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} |
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/* |
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* em28xx_i2c_send_bytes() |
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*/ |
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static int em28xx_i2c_send_bytes(struct em28xx *dev, u16 addr, u8 *buf, |
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u16 len, int stop) |
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{ |
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unsigned long timeout = jiffies + em28xx_i2c_timeout(dev); |
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int ret; |
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if (len < 1 || len > 64) |
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return -EOPNOTSUPP; |
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/* |
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* NOTE: limited by the USB ctrl message constraints |
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* Zero length reads always succeed, even if no device is connected |
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*/ |
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/* Write to i2c device */ |
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ret = dev->em28xx_write_regs_req(dev, stop ? 2 : 3, addr, buf, len); |
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if (ret != len) { |
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if (ret < 0) { |
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dev_warn(&dev->intf->dev, |
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"writing to i2c device at 0x%x failed (error=%i)\n", |
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addr, ret); |
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return ret; |
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} |
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dev_warn(&dev->intf->dev, |
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"%i bytes write to i2c device at 0x%x requested, but %i bytes written\n", |
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len, addr, ret); |
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return -EIO; |
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} |
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/* wait for completion */ |
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while (time_is_after_jiffies(timeout)) { |
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ret = dev->em28xx_read_reg(dev, 0x05); |
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if (ret == 0) /* success */ |
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return len; |
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if (ret == 0x10) { |
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dprintk(1, "I2C ACK error on writing to addr 0x%02x\n", |
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addr); |
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return -ENXIO; |
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} |
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if (ret < 0) { |
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dev_warn(&dev->intf->dev, |
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"failed to get i2c transfer status from bridge register (error=%i)\n", |
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ret); |
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return ret; |
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} |
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usleep_range(5000, 6000); |
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/* |
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* NOTE: do we really have to wait for success ? |
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* Never seen anything else than 0x00 or 0x10 |
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* (even with high payload) ... |
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*/ |
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} |
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if (ret == 0x02 || ret == 0x04) { |
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/* NOTE: these errors seem to be related to clock stretching */ |
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dprintk(0, |
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"write to i2c device at 0x%x timed out (status=%i)\n", |
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addr, ret); |
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return -ETIMEDOUT; |
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} |
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dev_warn(&dev->intf->dev, |
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"write to i2c device at 0x%x failed with unknown error (status=%i)\n", |
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addr, ret); |
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return -EIO; |
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} |
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/* |
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* em28xx_i2c_recv_bytes() |
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* read a byte from the i2c device |
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*/ |
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static int em28xx_i2c_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf, u16 len) |
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{ |
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int ret; |
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if (len < 1 || len > 64) |
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return -EOPNOTSUPP; |
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/* |
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* NOTE: limited by the USB ctrl message constraints |
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* Zero length reads always succeed, even if no device is connected |
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*/ |
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/* Read data from i2c device */ |
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ret = dev->em28xx_read_reg_req_len(dev, 2, addr, buf, len); |
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if (ret < 0) { |
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dev_warn(&dev->intf->dev, |
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"reading from i2c device at 0x%x failed (error=%i)\n", |
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addr, ret); |
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return ret; |
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} else if (ret != len) { |
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dev_dbg(&dev->intf->dev, |
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"%i bytes read from i2c device at 0x%x requested, but %i bytes written\n", |
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ret, addr, len); |
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} |
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/* |
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* NOTE: some devices with two i2c buses have the bad habit to return 0 |
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* bytes if we are on bus B AND there was no write attempt to the |
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* specified slave address before AND no device is present at the |
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* requested slave address. |
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* Anyway, the next check will fail with -ENXIO in this case, so avoid |
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* spamming the system log on device probing and do nothing here. |
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*/ |
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/* Check success of the i2c operation */ |
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ret = dev->em28xx_read_reg(dev, 0x05); |
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if (ret == 0) /* success */ |
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return len; |
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if (ret < 0) { |
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dev_warn(&dev->intf->dev, |
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"failed to get i2c transfer status from bridge register (error=%i)\n", |
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ret); |
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return ret; |
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} |
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if (ret == 0x10) { |
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dprintk(1, "I2C ACK error on writing to addr 0x%02x\n", |
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addr); |
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return -ENXIO; |
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} |
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if (ret == 0x02 || ret == 0x04) { |
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/* NOTE: these errors seem to be related to clock stretching */ |
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dprintk(0, |
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"write to i2c device at 0x%x timed out (status=%i)\n", |
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addr, ret); |
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return -ETIMEDOUT; |
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} |
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dev_warn(&dev->intf->dev, |
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"read from i2c device at 0x%x failed with unknown error (status=%i)\n", |
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addr, ret); |
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return -EIO; |
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} |
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/* |
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* em28xx_i2c_check_for_device() |
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* check if there is a i2c_device at the supplied address |
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*/ |
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static int em28xx_i2c_check_for_device(struct em28xx *dev, u16 addr) |
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{ |
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int ret; |
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u8 buf; |
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ret = em28xx_i2c_recv_bytes(dev, addr, &buf, 1); |
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if (ret == 1) |
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return 0; |
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return (ret < 0) ? ret : -EIO; |
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} |
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/* |
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* em25xx_bus_B_send_bytes |
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* write bytes to the i2c device |
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*/ |
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static int em25xx_bus_B_send_bytes(struct em28xx *dev, u16 addr, u8 *buf, |
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u16 len) |
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{ |
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int ret; |
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if (len < 1 || len > 64) |
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return -EOPNOTSUPP; |
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/* |
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* NOTE: limited by the USB ctrl message constraints |
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* Zero length reads always succeed, even if no device is connected |
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*/ |
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/* Set register and write value */ |
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ret = dev->em28xx_write_regs_req(dev, 0x06, addr, buf, len); |
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if (ret != len) { |
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if (ret < 0) { |
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dev_warn(&dev->intf->dev, |
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"writing to i2c device at 0x%x failed (error=%i)\n", |
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addr, ret); |
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return ret; |
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} |
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dev_warn(&dev->intf->dev, |
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"%i bytes write to i2c device at 0x%x requested, but %i bytes written\n", |
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len, addr, ret); |
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return -EIO; |
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} |
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/* Check success */ |
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ret = dev->em28xx_read_reg_req(dev, 0x08, 0x0000); |
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/* |
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* NOTE: the only error we've seen so far is |
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* 0x01 when the slave device is not present |
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*/ |
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if (!ret) |
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return len; |
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if (ret > 0) { |
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dprintk(1, "Bus B R08 returned 0x%02x: I2C ACK error\n", ret); |
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return -ENXIO; |
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} |
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return ret; |
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/* |
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* NOTE: With chip types (other chip IDs) which actually don't support |
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* this operation, it seems to succeed ALWAYS ! (even if there is no |
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* slave device or even no second i2c bus provided) |
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*/ |
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} |
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/* |
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* em25xx_bus_B_recv_bytes |
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* read bytes from the i2c device |
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*/ |
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static int em25xx_bus_B_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf, |
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u16 len) |
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{ |
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int ret; |
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if (len < 1 || len > 64) |
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return -EOPNOTSUPP; |
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/* |
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* NOTE: limited by the USB ctrl message constraints |
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* Zero length reads always succeed, even if no device is connected |
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*/ |
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/* Read value */ |
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ret = dev->em28xx_read_reg_req_len(dev, 0x06, addr, buf, len); |
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if (ret < 0) { |
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dev_warn(&dev->intf->dev, |
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"reading from i2c device at 0x%x failed (error=%i)\n", |
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addr, ret); |
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return ret; |
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} |
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/* |
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* NOTE: some devices with two i2c buses have the bad habit to return 0 |
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* bytes if we are on bus B AND there was no write attempt to the |
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* specified slave address before AND no device is present at the |
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* requested slave address. |
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* Anyway, the next check will fail with -ENXIO in this case, so avoid |
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* spamming the system log on device probing and do nothing here. |
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*/ |
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/* Check success */ |
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ret = dev->em28xx_read_reg_req(dev, 0x08, 0x0000); |
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/* |
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* NOTE: the only error we've seen so far is |
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* 0x01 when the slave device is not present |
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*/ |
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if (!ret) |
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return len; |
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if (ret > 0) { |
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dprintk(1, "Bus B R08 returned 0x%02x: I2C ACK error\n", ret); |
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return -ENXIO; |
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} |
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return ret; |
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/* |
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* NOTE: With chip types (other chip IDs) which actually don't support |
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* this operation, it seems to succeed ALWAYS ! (even if there is no |
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* slave device or even no second i2c bus provided) |
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*/ |
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} |
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|
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/* |
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* em25xx_bus_B_check_for_device() |
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* check if there is a i2c device at the supplied address |
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*/ |
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static int em25xx_bus_B_check_for_device(struct em28xx *dev, u16 addr) |
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{ |
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u8 buf; |
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int ret; |
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ret = em25xx_bus_B_recv_bytes(dev, addr, &buf, 1); |
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if (ret < 0) |
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return ret; |
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|
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return 0; |
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/* |
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* NOTE: With chips which do not support this operation, |
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* it seems to succeed ALWAYS ! (even if no device connected) |
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*/ |
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} |
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static inline int i2c_check_for_device(struct em28xx_i2c_bus *i2c_bus, u16 addr) |
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{ |
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struct em28xx *dev = i2c_bus->dev; |
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int rc = -EOPNOTSUPP; |
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if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX) |
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rc = em28xx_i2c_check_for_device(dev, addr); |
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else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800) |
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rc = em2800_i2c_check_for_device(dev, addr); |
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else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B) |
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rc = em25xx_bus_B_check_for_device(dev, addr); |
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return rc; |
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} |
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|
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static inline int i2c_recv_bytes(struct em28xx_i2c_bus *i2c_bus, |
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struct i2c_msg msg) |
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{ |
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struct em28xx *dev = i2c_bus->dev; |
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u16 addr = msg.addr << 1; |
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int rc = -EOPNOTSUPP; |
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|
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if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX) |
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rc = em28xx_i2c_recv_bytes(dev, addr, msg.buf, msg.len); |
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else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800) |
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rc = em2800_i2c_recv_bytes(dev, addr, msg.buf, msg.len); |
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else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B) |
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rc = em25xx_bus_B_recv_bytes(dev, addr, msg.buf, msg.len); |
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return rc; |
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} |
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|
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static inline int i2c_send_bytes(struct em28xx_i2c_bus *i2c_bus, |
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struct i2c_msg msg, int stop) |
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{ |
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struct em28xx *dev = i2c_bus->dev; |
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u16 addr = msg.addr << 1; |
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int rc = -EOPNOTSUPP; |
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|
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if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX) |
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rc = em28xx_i2c_send_bytes(dev, addr, msg.buf, msg.len, stop); |
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else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800) |
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rc = em2800_i2c_send_bytes(dev, addr, msg.buf, msg.len); |
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else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B) |
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rc = em25xx_bus_B_send_bytes(dev, addr, msg.buf, msg.len); |
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return rc; |
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} |
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|
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/* |
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* em28xx_i2c_xfer() |
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* the main i2c transfer function |
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*/ |
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static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap, |
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struct i2c_msg msgs[], int num) |
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{ |
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struct em28xx_i2c_bus *i2c_bus = i2c_adap->algo_data; |
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struct em28xx *dev = i2c_bus->dev; |
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unsigned int bus = i2c_bus->bus; |
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int addr, rc, i; |
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u8 reg; |
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|
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/* |
|
* prevent i2c xfer attempts after device is disconnected |
|
* some fe's try to do i2c writes/reads from their release |
|
* interfaces when called in disconnect path |
|
*/ |
|
if (dev->disconnected) |
|
return -ENODEV; |
|
|
|
if (!rt_mutex_trylock(&dev->i2c_bus_lock)) |
|
return -EAGAIN; |
|
|
|
/* Switch I2C bus if needed */ |
|
if (bus != dev->cur_i2c_bus && |
|
i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX) { |
|
if (bus == 1) |
|
reg = EM2874_I2C_SECONDARY_BUS_SELECT; |
|
else |
|
reg = 0; |
|
em28xx_write_reg_bits(dev, EM28XX_R06_I2C_CLK, reg, |
|
EM2874_I2C_SECONDARY_BUS_SELECT); |
|
dev->cur_i2c_bus = bus; |
|
} |
|
|
|
for (i = 0; i < num; i++) { |
|
addr = msgs[i].addr << 1; |
|
if (!msgs[i].len) { |
|
/* |
|
* no len: check only for device presence |
|
* This code is only called during device probe. |
|
*/ |
|
rc = i2c_check_for_device(i2c_bus, addr); |
|
|
|
if (rc == -ENXIO) |
|
rc = -ENODEV; |
|
} else if (msgs[i].flags & I2C_M_RD) { |
|
/* read bytes */ |
|
rc = i2c_recv_bytes(i2c_bus, msgs[i]); |
|
} else { |
|
/* write bytes */ |
|
rc = i2c_send_bytes(i2c_bus, msgs[i], i == num - 1); |
|
} |
|
|
|
if (rc < 0) |
|
goto error; |
|
|
|
dprintk(2, "%s %s addr=%02x len=%d: %*ph\n", |
|
(msgs[i].flags & I2C_M_RD) ? "read" : "write", |
|
i == num - 1 ? "stop" : "nonstop", |
|
addr, msgs[i].len, |
|
msgs[i].len, msgs[i].buf); |
|
} |
|
|
|
rt_mutex_unlock(&dev->i2c_bus_lock); |
|
return num; |
|
|
|
error: |
|
dprintk(2, "%s %s addr=%02x len=%d: %sERROR: %i\n", |
|
(msgs[i].flags & I2C_M_RD) ? "read" : "write", |
|
i == num - 1 ? "stop" : "nonstop", |
|
addr, msgs[i].len, |
|
(rc == -ENODEV) ? "no device " : "", |
|
rc); |
|
|
|
rt_mutex_unlock(&dev->i2c_bus_lock); |
|
return rc; |
|
} |
|
|
|
/* |
|
* based on linux/sunrpc/svcauth.h and linux/hash.h |
|
* The original hash function returns a different value, if arch is x86_64 |
|
* or i386. |
|
*/ |
|
static inline unsigned long em28xx_hash_mem(char *buf, int length, int bits) |
|
{ |
|
unsigned long hash = 0; |
|
unsigned long l = 0; |
|
int len = 0; |
|
unsigned char c; |
|
|
|
do { |
|
if (len == length) { |
|
c = (char)len; |
|
len = -1; |
|
} else { |
|
c = *buf++; |
|
} |
|
l = (l << 8) | c; |
|
len++; |
|
if ((len & (32 / 8 - 1)) == 0) |
|
hash = ((hash ^ l) * 0x9e370001UL); |
|
} while (len); |
|
|
|
return (hash >> (32 - bits)) & 0xffffffffUL; |
|
} |
|
|
|
/* |
|
* Helper function to read data blocks from i2c clients with 8 or 16 bit |
|
* address width, 8 bit register width and auto incrementation been activated |
|
*/ |
|
static int em28xx_i2c_read_block(struct em28xx *dev, unsigned int bus, u16 addr, |
|
bool addr_w16, u16 len, u8 *data) |
|
{ |
|
int remain = len, rsize, rsize_max, ret; |
|
u8 buf[2]; |
|
|
|
/* Sanity check */ |
|
if (addr + remain > (addr_w16 * 0xff00 + 0xff + 1)) |
|
return -EINVAL; |
|
/* Select address */ |
|
buf[0] = addr >> 8; |
|
buf[1] = addr & 0xff; |
|
ret = i2c_master_send(&dev->i2c_client[bus], |
|
buf + !addr_w16, 1 + addr_w16); |
|
if (ret < 0) |
|
return ret; |
|
/* Read data */ |
|
if (dev->board.is_em2800) |
|
rsize_max = 4; |
|
else |
|
rsize_max = 64; |
|
while (remain > 0) { |
|
if (remain > rsize_max) |
|
rsize = rsize_max; |
|
else |
|
rsize = remain; |
|
|
|
ret = i2c_master_recv(&dev->i2c_client[bus], data, rsize); |
|
if (ret < 0) |
|
return ret; |
|
|
|
remain -= rsize; |
|
data += rsize; |
|
} |
|
|
|
return len; |
|
} |
|
|
|
static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned int bus, |
|
u8 **eedata, u16 *eedata_len) |
|
{ |
|
const u16 len = 256; |
|
/* |
|
* FIXME common length/size for bytes to read, to display, hash |
|
* calculation and returned device dataset. Simplifies the code a lot, |
|
* but we might have to deal with multiple sizes in the future ! |
|
*/ |
|
int err; |
|
struct em28xx_eeprom *dev_config; |
|
u8 buf, *data; |
|
|
|
*eedata = NULL; |
|
*eedata_len = 0; |
|
|
|
/* EEPROM is always on i2c bus 0 on all known devices. */ |
|
|
|
dev->i2c_client[bus].addr = 0xa0 >> 1; |
|
|
|
/* Check if board has eeprom */ |
|
err = i2c_master_recv(&dev->i2c_client[bus], &buf, 0); |
|
if (err < 0) { |
|
dev_info(&dev->intf->dev, "board has no eeprom\n"); |
|
return -ENODEV; |
|
} |
|
|
|
data = kzalloc(len, GFP_KERNEL); |
|
if (!data) |
|
return -ENOMEM; |
|
|
|
/* Read EEPROM content */ |
|
err = em28xx_i2c_read_block(dev, bus, 0x0000, |
|
dev->eeprom_addrwidth_16bit, |
|
len, data); |
|
if (err != len) { |
|
dev_err(&dev->intf->dev, |
|
"failed to read eeprom (err=%d)\n", err); |
|
goto error; |
|
} |
|
|
|
if (i2c_debug) { |
|
/* Display eeprom content */ |
|
print_hex_dump(KERN_DEBUG, "em28xx eeprom ", DUMP_PREFIX_OFFSET, |
|
16, 1, data, len, true); |
|
|
|
if (dev->eeprom_addrwidth_16bit) |
|
dev_info(&dev->intf->dev, |
|
"eeprom %06x: ... (skipped)\n", 256); |
|
} |
|
|
|
if (dev->eeprom_addrwidth_16bit && |
|
data[0] == 0x26 && data[3] == 0x00) { |
|
/* new eeprom format; size 4-64kb */ |
|
u16 mc_start; |
|
u16 hwconf_offset; |
|
|
|
dev->hash = em28xx_hash_mem(data, len, 32); |
|
mc_start = (data[1] << 8) + 4; /* usually 0x0004 */ |
|
|
|
dev_info(&dev->intf->dev, |
|
"EEPROM ID = %4ph, EEPROM hash = 0x%08lx\n", |
|
data, dev->hash); |
|
dev_info(&dev->intf->dev, |
|
"EEPROM info:\n"); |
|
dev_info(&dev->intf->dev, |
|
"\tmicrocode start address = 0x%04x, boot configuration = 0x%02x\n", |
|
mc_start, data[2]); |
|
/* |
|
* boot configuration (address 0x0002): |
|
* [0] microcode download speed: 1 = 400 kHz; 0 = 100 kHz |
|
* [1] always selects 12 kb RAM |
|
* [2] USB device speed: 1 = force Full Speed; 0 = auto detect |
|
* [4] 1 = force fast mode and no suspend for device testing |
|
* [5:7] USB PHY tuning registers; determined by device |
|
* characterization |
|
*/ |
|
|
|
/* |
|
* Read hardware config dataset offset from address |
|
* (microcode start + 46) |
|
*/ |
|
err = em28xx_i2c_read_block(dev, bus, mc_start + 46, 1, 2, |
|
data); |
|
if (err != 2) { |
|
dev_err(&dev->intf->dev, |
|
"failed to read hardware configuration data from eeprom (err=%d)\n", |
|
err); |
|
goto error; |
|
} |
|
|
|
/* Calculate hardware config dataset start address */ |
|
hwconf_offset = mc_start + data[0] + (data[1] << 8); |
|
|
|
/* Read hardware config dataset */ |
|
/* |
|
* NOTE: the microcode copy can be multiple pages long, but |
|
* we assume the hardware config dataset is the same as in |
|
* the old eeprom and not longer than 256 bytes. |
|
* tveeprom is currently also limited to 256 bytes. |
|
*/ |
|
err = em28xx_i2c_read_block(dev, bus, hwconf_offset, 1, len, |
|
data); |
|
if (err != len) { |
|
dev_err(&dev->intf->dev, |
|
"failed to read hardware configuration data from eeprom (err=%d)\n", |
|
err); |
|
goto error; |
|
} |
|
|
|
/* Verify hardware config dataset */ |
|
/* NOTE: not all devices provide this type of dataset */ |
|
if (data[0] != 0x1a || data[1] != 0xeb || |
|
data[2] != 0x67 || data[3] != 0x95) { |
|
dev_info(&dev->intf->dev, |
|
"\tno hardware configuration dataset found in eeprom\n"); |
|
kfree(data); |
|
return 0; |
|
} |
|
|
|
/* |
|
* TODO: decrypt eeprom data for camera bridges |
|
* (em25xx, em276x+) |
|
*/ |
|
|
|
} else if (!dev->eeprom_addrwidth_16bit && |
|
data[0] == 0x1a && data[1] == 0xeb && |
|
data[2] == 0x67 && data[3] == 0x95) { |
|
dev->hash = em28xx_hash_mem(data, len, 32); |
|
dev_info(&dev->intf->dev, |
|
"EEPROM ID = %4ph, EEPROM hash = 0x%08lx\n", |
|
data, dev->hash); |
|
dev_info(&dev->intf->dev, |
|
"EEPROM info:\n"); |
|
} else { |
|
dev_info(&dev->intf->dev, |
|
"unknown eeprom format or eeprom corrupted !\n"); |
|
err = -ENODEV; |
|
goto error; |
|
} |
|
|
|
*eedata = data; |
|
*eedata_len = len; |
|
dev_config = (void *)*eedata; |
|
|
|
switch (le16_to_cpu(dev_config->chip_conf) >> 4 & 0x3) { |
|
case 0: |
|
dev_info(&dev->intf->dev, "\tNo audio on board.\n"); |
|
break; |
|
case 1: |
|
dev_info(&dev->intf->dev, "\tAC97 audio (5 sample rates)\n"); |
|
break; |
|
case 2: |
|
if (dev->chip_id < CHIP_ID_EM2860) |
|
dev_info(&dev->intf->dev, |
|
"\tI2S audio, sample rate=32k\n"); |
|
else |
|
dev_info(&dev->intf->dev, |
|
"\tI2S audio, 3 sample rates\n"); |
|
break; |
|
case 3: |
|
if (dev->chip_id < CHIP_ID_EM2860) |
|
dev_info(&dev->intf->dev, |
|
"\tI2S audio, 3 sample rates\n"); |
|
else |
|
dev_info(&dev->intf->dev, |
|
"\tI2S audio, 5 sample rates\n"); |
|
break; |
|
} |
|
|
|
if (le16_to_cpu(dev_config->chip_conf) & 1 << 3) |
|
dev_info(&dev->intf->dev, "\tUSB Remote wakeup capable\n"); |
|
|
|
if (le16_to_cpu(dev_config->chip_conf) & 1 << 2) |
|
dev_info(&dev->intf->dev, "\tUSB Self power capable\n"); |
|
|
|
switch (le16_to_cpu(dev_config->chip_conf) & 0x3) { |
|
case 0: |
|
dev_info(&dev->intf->dev, "\t500mA max power\n"); |
|
break; |
|
case 1: |
|
dev_info(&dev->intf->dev, "\t400mA max power\n"); |
|
break; |
|
case 2: |
|
dev_info(&dev->intf->dev, "\t300mA max power\n"); |
|
break; |
|
case 3: |
|
dev_info(&dev->intf->dev, "\t200mA max power\n"); |
|
break; |
|
} |
|
dev_info(&dev->intf->dev, |
|
"\tTable at offset 0x%02x, strings=0x%04x, 0x%04x, 0x%04x\n", |
|
dev_config->string_idx_table, |
|
le16_to_cpu(dev_config->string1), |
|
le16_to_cpu(dev_config->string2), |
|
le16_to_cpu(dev_config->string3)); |
|
|
|
return 0; |
|
|
|
error: |
|
kfree(data); |
|
return err; |
|
} |
|
|
|
/* ----------------------------------------------------------- */ |
|
|
|
/* |
|
* functionality() |
|
*/ |
|
static u32 functionality(struct i2c_adapter *i2c_adap) |
|
{ |
|
struct em28xx_i2c_bus *i2c_bus = i2c_adap->algo_data; |
|
|
|
if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX || |
|
i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B) { |
|
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; |
|
} else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800) { |
|
return (I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL) & |
|
~I2C_FUNC_SMBUS_WRITE_BLOCK_DATA; |
|
} |
|
|
|
WARN(1, "Unknown i2c bus algorithm.\n"); |
|
return 0; |
|
} |
|
|
|
static const struct i2c_algorithm em28xx_algo = { |
|
.master_xfer = em28xx_i2c_xfer, |
|
.functionality = functionality, |
|
}; |
|
|
|
static const struct i2c_adapter em28xx_adap_template = { |
|
.owner = THIS_MODULE, |
|
.name = "em28xx", |
|
.algo = &em28xx_algo, |
|
}; |
|
|
|
static const struct i2c_client em28xx_client_template = { |
|
.name = "em28xx internal", |
|
}; |
|
|
|
/* ----------------------------------------------------------- */ |
|
|
|
/* |
|
* i2c_devs |
|
* incomplete list of known devices |
|
*/ |
|
static char *i2c_devs[128] = { |
|
[0x1c >> 1] = "lgdt330x", |
|
[0x3e >> 1] = "remote IR sensor", |
|
[0x4a >> 1] = "saa7113h", |
|
[0x52 >> 1] = "drxk", |
|
[0x60 >> 1] = "remote IR sensor", |
|
[0x8e >> 1] = "remote IR sensor", |
|
[0x86 >> 1] = "tda9887", |
|
[0x80 >> 1] = "msp34xx", |
|
[0x88 >> 1] = "msp34xx", |
|
[0xa0 >> 1] = "eeprom", |
|
[0xb0 >> 1] = "tda9874", |
|
[0xb8 >> 1] = "tvp5150a", |
|
[0xba >> 1] = "webcam sensor or tvp5150a", |
|
[0xc0 >> 1] = "tuner (analog)", |
|
[0xc2 >> 1] = "tuner (analog)", |
|
[0xc4 >> 1] = "tuner (analog)", |
|
[0xc6 >> 1] = "tuner (analog)", |
|
}; |
|
|
|
/* |
|
* do_i2c_scan() |
|
* check i2c address range for devices |
|
*/ |
|
void em28xx_do_i2c_scan(struct em28xx *dev, unsigned int bus) |
|
{ |
|
u8 i2c_devicelist[128]; |
|
unsigned char buf; |
|
int i, rc; |
|
|
|
memset(i2c_devicelist, 0, sizeof(i2c_devicelist)); |
|
|
|
for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) { |
|
dev->i2c_client[bus].addr = i; |
|
rc = i2c_master_recv(&dev->i2c_client[bus], &buf, 0); |
|
if (rc < 0) |
|
continue; |
|
i2c_devicelist[i] = i; |
|
dev_info(&dev->intf->dev, |
|
"found i2c device @ 0x%x on bus %d [%s]\n", |
|
i << 1, bus, i2c_devs[i] ? i2c_devs[i] : "???"); |
|
} |
|
|
|
if (bus == dev->def_i2c_bus) |
|
dev->i2c_hash = em28xx_hash_mem(i2c_devicelist, |
|
sizeof(i2c_devicelist), 32); |
|
} |
|
|
|
/* |
|
* em28xx_i2c_register() |
|
* register i2c bus |
|
*/ |
|
int em28xx_i2c_register(struct em28xx *dev, unsigned int bus, |
|
enum em28xx_i2c_algo_type algo_type) |
|
{ |
|
int retval; |
|
|
|
if (WARN_ON(!dev->em28xx_write_regs || !dev->em28xx_read_reg || |
|
!dev->em28xx_write_regs_req || !dev->em28xx_read_reg_req)) |
|
return -ENODEV; |
|
|
|
if (bus >= NUM_I2C_BUSES) |
|
return -ENODEV; |
|
|
|
dev->i2c_adap[bus] = em28xx_adap_template; |
|
dev->i2c_adap[bus].dev.parent = &dev->intf->dev; |
|
strscpy(dev->i2c_adap[bus].name, dev_name(&dev->intf->dev), |
|
sizeof(dev->i2c_adap[bus].name)); |
|
|
|
dev->i2c_bus[bus].bus = bus; |
|
dev->i2c_bus[bus].algo_type = algo_type; |
|
dev->i2c_bus[bus].dev = dev; |
|
dev->i2c_adap[bus].algo_data = &dev->i2c_bus[bus]; |
|
|
|
retval = i2c_add_adapter(&dev->i2c_adap[bus]); |
|
if (retval < 0) { |
|
dev_err(&dev->intf->dev, |
|
"%s: i2c_add_adapter failed! retval [%d]\n", |
|
__func__, retval); |
|
return retval; |
|
} |
|
|
|
dev->i2c_client[bus] = em28xx_client_template; |
|
dev->i2c_client[bus].adapter = &dev->i2c_adap[bus]; |
|
|
|
/* Up to now, all eeproms are at bus 0 */ |
|
if (!bus) { |
|
retval = em28xx_i2c_eeprom(dev, bus, |
|
&dev->eedata, &dev->eedata_len); |
|
if (retval < 0 && retval != -ENODEV) { |
|
dev_err(&dev->intf->dev, |
|
"%s: em28xx_i2_eeprom failed! retval [%d]\n", |
|
__func__, retval); |
|
} |
|
} |
|
|
|
if (i2c_scan) |
|
em28xx_do_i2c_scan(dev, bus); |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* em28xx_i2c_unregister() |
|
* unregister i2c_bus |
|
*/ |
|
int em28xx_i2c_unregister(struct em28xx *dev, unsigned int bus) |
|
{ |
|
if (bus >= NUM_I2C_BUSES) |
|
return -ENODEV; |
|
|
|
i2c_del_adapter(&dev->i2c_adap[bus]); |
|
return 0; |
|
}
|
|
|