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284 lines
5.7 KiB
284 lines
5.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* STK1160 driver |
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* |
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* Copyright (C) 2012 Ezequiel Garcia |
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* <elezegarcia--a.t--gmail.com> |
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* |
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* Based on Easycap driver by R.M. Thomas |
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* Copyright (C) 2010 R.M. Thomas |
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* <rmthomas--a.t--sciolus.org> |
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*/ |
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#include <linux/module.h> |
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#include <linux/usb.h> |
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#include <linux/i2c.h> |
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#include "stk1160.h" |
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#include "stk1160-reg.h" |
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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, "enable debug messages [i2c]"); |
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#define dprintk_i2c(fmt, args...) \ |
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do { \ |
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if (i2c_debug) \ |
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printk(KERN_DEBUG fmt, ##args); \ |
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} while (0) |
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static int stk1160_i2c_busy_wait(struct stk1160 *dev, u8 wait_bit_mask) |
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{ |
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unsigned long end; |
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u8 flag; |
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/* Wait until read/write finish bit is set */ |
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end = jiffies + msecs_to_jiffies(STK1160_I2C_TIMEOUT); |
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while (time_is_after_jiffies(end)) { |
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stk1160_read_reg(dev, STK1160_SICTL+1, &flag); |
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/* read/write done? */ |
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if (flag & wait_bit_mask) |
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goto done; |
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usleep_range(10 * USEC_PER_MSEC, 20 * USEC_PER_MSEC); |
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} |
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return -ETIMEDOUT; |
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done: |
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return 0; |
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} |
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static int stk1160_i2c_write_reg(struct stk1160 *dev, u8 addr, |
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u8 reg, u8 value) |
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{ |
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int rc; |
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/* Set serial device address */ |
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rc = stk1160_write_reg(dev, STK1160_SICTL_SDA, addr); |
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if (rc < 0) |
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return rc; |
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/* Set i2c device register sub-address */ |
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rc = stk1160_write_reg(dev, STK1160_SBUSW_WA, reg); |
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if (rc < 0) |
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return rc; |
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/* Set i2c device register value */ |
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rc = stk1160_write_reg(dev, STK1160_SBUSW_WD, value); |
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if (rc < 0) |
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return rc; |
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/* Start write now */ |
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rc = stk1160_write_reg(dev, STK1160_SICTL, 0x01); |
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if (rc < 0) |
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return rc; |
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rc = stk1160_i2c_busy_wait(dev, 0x04); |
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if (rc < 0) |
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return rc; |
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return 0; |
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} |
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static int stk1160_i2c_read_reg(struct stk1160 *dev, u8 addr, |
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u8 reg, u8 *value) |
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{ |
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int rc; |
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/* Set serial device address */ |
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rc = stk1160_write_reg(dev, STK1160_SICTL_SDA, addr); |
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if (rc < 0) |
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return rc; |
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/* Set i2c device register sub-address */ |
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rc = stk1160_write_reg(dev, STK1160_SBUSR_RA, reg); |
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if (rc < 0) |
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return rc; |
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/* Start read now */ |
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rc = stk1160_write_reg(dev, STK1160_SICTL, 0x20); |
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if (rc < 0) |
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return rc; |
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rc = stk1160_i2c_busy_wait(dev, 0x01); |
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if (rc < 0) |
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return rc; |
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rc = stk1160_read_reg(dev, STK1160_SBUSR_RD, value); |
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if (rc < 0) |
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return rc; |
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return 0; |
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} |
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/* |
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* stk1160_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 stk1160_i2c_check_for_device(struct stk1160 *dev, |
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unsigned char addr) |
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{ |
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int rc; |
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/* Set serial device address */ |
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rc = stk1160_write_reg(dev, STK1160_SICTL_SDA, addr); |
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if (rc < 0) |
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return rc; |
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/* Set device sub-address, we'll chip version reg */ |
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rc = stk1160_write_reg(dev, STK1160_SBUSR_RA, 0x00); |
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if (rc < 0) |
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return rc; |
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/* Start read now */ |
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rc = stk1160_write_reg(dev, STK1160_SICTL, 0x20); |
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if (rc < 0) |
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return rc; |
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rc = stk1160_i2c_busy_wait(dev, 0x01); |
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if (rc < 0) |
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return -ENODEV; |
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return 0; |
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} |
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/* |
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* stk1160_i2c_xfer() |
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* the main i2c transfer function |
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*/ |
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static int stk1160_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 stk1160 *dev = i2c_adap->algo_data; |
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int addr, rc, i; |
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for (i = 0; i < num; i++) { |
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addr = msgs[i].addr << 1; |
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dprintk_i2c("%s: addr=%x", __func__, addr); |
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if (!msgs[i].len) { |
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/* no len: check only for device presence */ |
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rc = stk1160_i2c_check_for_device(dev, addr); |
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if (rc < 0) { |
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dprintk_i2c(" no device\n"); |
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return rc; |
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} |
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} else if (msgs[i].flags & I2C_M_RD) { |
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/* read request without preceding register selection */ |
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dprintk_i2c(" subaddr not selected"); |
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rc = -EOPNOTSUPP; |
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goto err; |
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} else if (i + 1 < num && msgs[i].len <= 2 && |
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(msgs[i + 1].flags & I2C_M_RD) && |
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msgs[i].addr == msgs[i + 1].addr) { |
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if (msgs[i].len != 1 || msgs[i + 1].len != 1) { |
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dprintk_i2c(" len not supported"); |
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rc = -EOPNOTSUPP; |
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goto err; |
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} |
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dprintk_i2c(" subaddr=%x", msgs[i].buf[0]); |
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rc = stk1160_i2c_read_reg(dev, addr, msgs[i].buf[0], |
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msgs[i + 1].buf); |
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dprintk_i2c(" read=%x", *msgs[i + 1].buf); |
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/* consumed two msgs, so we skip one of them */ |
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i++; |
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} else { |
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if (msgs[i].len != 2) { |
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dprintk_i2c(" len not supported"); |
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rc = -EOPNOTSUPP; |
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goto err; |
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} |
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dprintk_i2c(" subaddr=%x write=%x", |
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msgs[i].buf[0], msgs[i].buf[1]); |
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rc = stk1160_i2c_write_reg(dev, addr, msgs[i].buf[0], |
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msgs[i].buf[1]); |
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} |
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if (rc < 0) |
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goto err; |
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dprintk_i2c(" OK\n"); |
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} |
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return num; |
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err: |
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dprintk_i2c(" ERROR: %d\n", rc); |
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return num; |
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} |
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/* |
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* functionality(), what da heck is this? |
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*/ |
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static u32 functionality(struct i2c_adapter *adap) |
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{ |
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return I2C_FUNC_SMBUS_EMUL; |
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} |
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static const struct i2c_algorithm algo = { |
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.master_xfer = stk1160_i2c_xfer, |
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.functionality = functionality, |
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}; |
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static const struct i2c_adapter adap_template = { |
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.owner = THIS_MODULE, |
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.name = "stk1160", |
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.algo = &algo, |
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}; |
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static const struct i2c_client client_template = { |
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.name = "stk1160 internal", |
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}; |
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/* |
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* stk1160_i2c_register() |
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* register i2c bus |
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*/ |
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int stk1160_i2c_register(struct stk1160 *dev) |
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{ |
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int rc; |
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dev->i2c_adap = adap_template; |
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dev->i2c_adap.dev.parent = dev->dev; |
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strscpy(dev->i2c_adap.name, "stk1160", sizeof(dev->i2c_adap.name)); |
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dev->i2c_adap.algo_data = dev; |
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i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev); |
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rc = i2c_add_adapter(&dev->i2c_adap); |
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if (rc < 0) { |
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stk1160_err("cannot add i2c adapter (%d)\n", rc); |
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return rc; |
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} |
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dev->i2c_client = client_template; |
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dev->i2c_client.adapter = &dev->i2c_adap; |
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/* Set i2c clock divider device address */ |
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stk1160_write_reg(dev, STK1160_SICTL_CD, 0x0f); |
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/* ??? */ |
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stk1160_write_reg(dev, STK1160_ASIC + 3, 0x00); |
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return 0; |
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} |
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/* |
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* stk1160_i2c_unregister() |
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* unregister i2c_bus |
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*/ |
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int stk1160_i2c_unregister(struct stk1160 *dev) |
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{ |
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i2c_del_adapter(&dev->i2c_adap); |
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return 0; |
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}
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