509 lines
13 KiB
C
509 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/i2c.h>
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#include <linux/mutex.h>
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#include <linux/module.h>
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#include "dibx000_common.h"
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static int debug;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "turn on debugging (default: 0)");
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#define dprintk(fmt, arg...) do { \
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if (debug) \
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printk(KERN_DEBUG pr_fmt("%s: " fmt), \
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__func__, ##arg); \
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} while (0)
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static int dibx000_write_word(struct dibx000_i2c_master *mst, u16 reg, u16 val)
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{
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int ret;
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if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) {
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dprintk("could not acquire lock\n");
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return -EINVAL;
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}
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mst->i2c_write_buffer[0] = (reg >> 8) & 0xff;
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mst->i2c_write_buffer[1] = reg & 0xff;
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mst->i2c_write_buffer[2] = (val >> 8) & 0xff;
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mst->i2c_write_buffer[3] = val & 0xff;
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memset(mst->msg, 0, sizeof(struct i2c_msg));
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mst->msg[0].addr = mst->i2c_addr;
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mst->msg[0].flags = 0;
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mst->msg[0].buf = mst->i2c_write_buffer;
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mst->msg[0].len = 4;
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ret = i2c_transfer(mst->i2c_adap, mst->msg, 1) != 1 ? -EREMOTEIO : 0;
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mutex_unlock(&mst->i2c_buffer_lock);
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return ret;
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}
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static u16 dibx000_read_word(struct dibx000_i2c_master *mst, u16 reg)
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{
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u16 ret;
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if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) {
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dprintk("could not acquire lock\n");
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return 0;
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}
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mst->i2c_write_buffer[0] = reg >> 8;
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mst->i2c_write_buffer[1] = reg & 0xff;
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memset(mst->msg, 0, 2 * sizeof(struct i2c_msg));
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mst->msg[0].addr = mst->i2c_addr;
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mst->msg[0].flags = 0;
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mst->msg[0].buf = mst->i2c_write_buffer;
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mst->msg[0].len = 2;
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mst->msg[1].addr = mst->i2c_addr;
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mst->msg[1].flags = I2C_M_RD;
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mst->msg[1].buf = mst->i2c_read_buffer;
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mst->msg[1].len = 2;
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if (i2c_transfer(mst->i2c_adap, mst->msg, 2) != 2)
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dprintk("i2c read error on %d\n", reg);
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ret = (mst->i2c_read_buffer[0] << 8) | mst->i2c_read_buffer[1];
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mutex_unlock(&mst->i2c_buffer_lock);
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return ret;
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}
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static int dibx000_is_i2c_done(struct dibx000_i2c_master *mst)
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{
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int i = 100;
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u16 status;
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while (((status = dibx000_read_word(mst, mst->base_reg + 2)) & 0x0100) == 0 && --i > 0)
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;
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/* i2c timed out */
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if (i == 0)
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return -EREMOTEIO;
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/* no acknowledge */
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if ((status & 0x0080) == 0)
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return -EREMOTEIO;
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return 0;
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}
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static int dibx000_master_i2c_write(struct dibx000_i2c_master *mst, struct i2c_msg *msg, u8 stop)
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{
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u16 data;
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u16 da;
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u16 i;
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u16 txlen = msg->len, len;
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const u8 *b = msg->buf;
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while (txlen) {
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dibx000_read_word(mst, mst->base_reg + 2);
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len = txlen > 8 ? 8 : txlen;
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for (i = 0; i < len; i += 2) {
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data = *b++ << 8;
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if (i+1 < len)
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data |= *b++;
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dibx000_write_word(mst, mst->base_reg, data);
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}
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da = (((u8) (msg->addr)) << 9) |
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(1 << 8) |
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(1 << 7) |
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(0 << 6) |
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(0 << 5) |
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((len & 0x7) << 2) |
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(0 << 1) |
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(0 << 0);
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if (txlen == msg->len)
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da |= 1 << 5; /* start */
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if (txlen-len == 0 && stop)
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da |= 1 << 6; /* stop */
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dibx000_write_word(mst, mst->base_reg+1, da);
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if (dibx000_is_i2c_done(mst) != 0)
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return -EREMOTEIO;
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txlen -= len;
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}
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return 0;
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}
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static int dibx000_master_i2c_read(struct dibx000_i2c_master *mst, struct i2c_msg *msg)
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{
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u16 da;
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u8 *b = msg->buf;
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u16 rxlen = msg->len, len;
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while (rxlen) {
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len = rxlen > 8 ? 8 : rxlen;
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da = (((u8) (msg->addr)) << 9) |
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(1 << 8) |
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(1 << 7) |
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(0 << 6) |
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(0 << 5) |
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((len & 0x7) << 2) |
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(1 << 1) |
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(0 << 0);
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if (rxlen == msg->len)
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da |= 1 << 5; /* start */
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if (rxlen-len == 0)
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da |= 1 << 6; /* stop */
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dibx000_write_word(mst, mst->base_reg+1, da);
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if (dibx000_is_i2c_done(mst) != 0)
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return -EREMOTEIO;
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rxlen -= len;
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while (len) {
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da = dibx000_read_word(mst, mst->base_reg);
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*b++ = (da >> 8) & 0xff;
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len--;
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if (len >= 1) {
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*b++ = da & 0xff;
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len--;
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}
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}
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}
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return 0;
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}
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int dibx000_i2c_set_speed(struct i2c_adapter *i2c_adap, u16 speed)
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{
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struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
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if (mst->device_rev < DIB7000MC && speed < 235)
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speed = 235;
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return dibx000_write_word(mst, mst->base_reg + 3, (u16)(60000 / speed));
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}
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EXPORT_SYMBOL(dibx000_i2c_set_speed);
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static u32 dibx000_i2c_func(struct i2c_adapter *adapter)
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{
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return I2C_FUNC_I2C;
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}
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static int dibx000_i2c_select_interface(struct dibx000_i2c_master *mst,
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enum dibx000_i2c_interface intf)
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{
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if (mst->device_rev > DIB3000MC && mst->selected_interface != intf) {
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dprintk("selecting interface: %d\n", intf);
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mst->selected_interface = intf;
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return dibx000_write_word(mst, mst->base_reg + 4, intf);
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}
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return 0;
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}
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static int dibx000_i2c_master_xfer_gpio12(struct i2c_adapter *i2c_adap, struct i2c_msg msg[], int num)
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{
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struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
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int msg_index;
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int ret = 0;
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dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_GPIO_1_2);
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for (msg_index = 0; msg_index < num; msg_index++) {
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if (msg[msg_index].flags & I2C_M_RD) {
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ret = dibx000_master_i2c_read(mst, &msg[msg_index]);
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if (ret != 0)
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return 0;
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} else {
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ret = dibx000_master_i2c_write(mst, &msg[msg_index], 1);
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if (ret != 0)
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return 0;
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}
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}
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return num;
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}
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static int dibx000_i2c_master_xfer_gpio34(struct i2c_adapter *i2c_adap, struct i2c_msg msg[], int num)
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{
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struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
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int msg_index;
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int ret = 0;
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dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_GPIO_3_4);
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for (msg_index = 0; msg_index < num; msg_index++) {
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if (msg[msg_index].flags & I2C_M_RD) {
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ret = dibx000_master_i2c_read(mst, &msg[msg_index]);
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if (ret != 0)
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return 0;
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} else {
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ret = dibx000_master_i2c_write(mst, &msg[msg_index], 1);
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if (ret != 0)
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return 0;
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}
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}
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return num;
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}
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static struct i2c_algorithm dibx000_i2c_master_gpio12_xfer_algo = {
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.master_xfer = dibx000_i2c_master_xfer_gpio12,
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.functionality = dibx000_i2c_func,
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};
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static struct i2c_algorithm dibx000_i2c_master_gpio34_xfer_algo = {
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.master_xfer = dibx000_i2c_master_xfer_gpio34,
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.functionality = dibx000_i2c_func,
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};
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static int dibx000_i2c_gate_ctrl(struct dibx000_i2c_master *mst, u8 tx[4],
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u8 addr, int onoff)
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{
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u16 val;
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if (onoff)
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val = addr << 8; // bit 7 = use master or not, if 0, the gate is open
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else
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val = 1 << 7;
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if (mst->device_rev > DIB7000)
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val <<= 1;
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tx[0] = (((mst->base_reg + 1) >> 8) & 0xff);
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tx[1] = ((mst->base_reg + 1) & 0xff);
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tx[2] = val >> 8;
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tx[3] = val & 0xff;
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return 0;
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}
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static int dibx000_i2c_gated_gpio67_xfer(struct i2c_adapter *i2c_adap,
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struct i2c_msg msg[], int num)
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{
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struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
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int ret;
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if (num > 32) {
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dprintk("%s: too much I2C message to be transmitted (%i). Maximum is 32",
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__func__, num);
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return -ENOMEM;
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}
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dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_GPIO_6_7);
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if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) {
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dprintk("could not acquire lock\n");
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return -EINVAL;
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}
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memset(mst->msg, 0, sizeof(struct i2c_msg) * (2 + num));
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/* open the gate */
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dibx000_i2c_gate_ctrl(mst, &mst->i2c_write_buffer[0], msg[0].addr, 1);
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mst->msg[0].addr = mst->i2c_addr;
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mst->msg[0].buf = &mst->i2c_write_buffer[0];
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mst->msg[0].len = 4;
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memcpy(&mst->msg[1], msg, sizeof(struct i2c_msg) * num);
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/* close the gate */
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dibx000_i2c_gate_ctrl(mst, &mst->i2c_write_buffer[4], 0, 0);
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mst->msg[num + 1].addr = mst->i2c_addr;
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mst->msg[num + 1].buf = &mst->i2c_write_buffer[4];
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mst->msg[num + 1].len = 4;
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ret = (i2c_transfer(mst->i2c_adap, mst->msg, 2 + num) == 2 + num ?
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num : -EIO);
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mutex_unlock(&mst->i2c_buffer_lock);
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return ret;
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}
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static struct i2c_algorithm dibx000_i2c_gated_gpio67_algo = {
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.master_xfer = dibx000_i2c_gated_gpio67_xfer,
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.functionality = dibx000_i2c_func,
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};
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static int dibx000_i2c_gated_tuner_xfer(struct i2c_adapter *i2c_adap,
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struct i2c_msg msg[], int num)
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{
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struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
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int ret;
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if (num > 32) {
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dprintk("%s: too much I2C message to be transmitted (%i). Maximum is 32",
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__func__, num);
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return -ENOMEM;
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}
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dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_TUNER);
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if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) {
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dprintk("could not acquire lock\n");
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return -EINVAL;
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}
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memset(mst->msg, 0, sizeof(struct i2c_msg) * (2 + num));
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/* open the gate */
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dibx000_i2c_gate_ctrl(mst, &mst->i2c_write_buffer[0], msg[0].addr, 1);
|
||
|
|
mst->msg[0].addr = mst->i2c_addr;
|
||
|
|
mst->msg[0].buf = &mst->i2c_write_buffer[0];
|
||
|
|
mst->msg[0].len = 4;
|
||
|
|
|
||
|
|
memcpy(&mst->msg[1], msg, sizeof(struct i2c_msg) * num);
|
||
|
|
|
||
|
|
/* close the gate */
|
||
|
|
dibx000_i2c_gate_ctrl(mst, &mst->i2c_write_buffer[4], 0, 0);
|
||
|
|
mst->msg[num + 1].addr = mst->i2c_addr;
|
||
|
|
mst->msg[num + 1].buf = &mst->i2c_write_buffer[4];
|
||
|
|
mst->msg[num + 1].len = 4;
|
||
|
|
|
||
|
|
ret = (i2c_transfer(mst->i2c_adap, mst->msg, 2 + num) == 2 + num ?
|
||
|
|
num : -EIO);
|
||
|
|
mutex_unlock(&mst->i2c_buffer_lock);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct i2c_algorithm dibx000_i2c_gated_tuner_algo = {
|
||
|
|
.master_xfer = dibx000_i2c_gated_tuner_xfer,
|
||
|
|
.functionality = dibx000_i2c_func,
|
||
|
|
};
|
||
|
|
|
||
|
|
struct i2c_adapter *dibx000_get_i2c_adapter(struct dibx000_i2c_master *mst,
|
||
|
|
enum dibx000_i2c_interface intf,
|
||
|
|
int gating)
|
||
|
|
{
|
||
|
|
struct i2c_adapter *i2c = NULL;
|
||
|
|
|
||
|
|
switch (intf) {
|
||
|
|
case DIBX000_I2C_INTERFACE_TUNER:
|
||
|
|
if (gating)
|
||
|
|
i2c = &mst->gated_tuner_i2c_adap;
|
||
|
|
break;
|
||
|
|
case DIBX000_I2C_INTERFACE_GPIO_1_2:
|
||
|
|
if (!gating)
|
||
|
|
i2c = &mst->master_i2c_adap_gpio12;
|
||
|
|
break;
|
||
|
|
case DIBX000_I2C_INTERFACE_GPIO_3_4:
|
||
|
|
if (!gating)
|
||
|
|
i2c = &mst->master_i2c_adap_gpio34;
|
||
|
|
break;
|
||
|
|
case DIBX000_I2C_INTERFACE_GPIO_6_7:
|
||
|
|
if (gating)
|
||
|
|
i2c = &mst->master_i2c_adap_gpio67;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
pr_err("incorrect I2C interface selected\n");
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return i2c;
|
||
|
|
}
|
||
|
|
|
||
|
|
EXPORT_SYMBOL(dibx000_get_i2c_adapter);
|
||
|
|
|
||
|
|
void dibx000_reset_i2c_master(struct dibx000_i2c_master *mst)
|
||
|
|
{
|
||
|
|
/* initialize the i2c-master by closing the gate */
|
||
|
|
u8 tx[4];
|
||
|
|
struct i2c_msg m = {.addr = mst->i2c_addr,.buf = tx,.len = 4 };
|
||
|
|
|
||
|
|
dibx000_i2c_gate_ctrl(mst, tx, 0, 0);
|
||
|
|
i2c_transfer(mst->i2c_adap, &m, 1);
|
||
|
|
mst->selected_interface = 0xff; // the first time force a select of the I2C
|
||
|
|
dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_TUNER);
|
||
|
|
}
|
||
|
|
|
||
|
|
EXPORT_SYMBOL(dibx000_reset_i2c_master);
|
||
|
|
|
||
|
|
static int i2c_adapter_init(struct i2c_adapter *i2c_adap,
|
||
|
|
struct i2c_algorithm *algo, const char *name,
|
||
|
|
struct dibx000_i2c_master *mst)
|
||
|
|
{
|
||
|
|
strscpy(i2c_adap->name, name, sizeof(i2c_adap->name));
|
||
|
|
i2c_adap->algo = algo;
|
||
|
|
i2c_adap->algo_data = NULL;
|
||
|
|
i2c_set_adapdata(i2c_adap, mst);
|
||
|
|
if (i2c_add_adapter(i2c_adap) < 0)
|
||
|
|
return -ENODEV;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int dibx000_init_i2c_master(struct dibx000_i2c_master *mst, u16 device_rev,
|
||
|
|
struct i2c_adapter *i2c_adap, u8 i2c_addr)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
mutex_init(&mst->i2c_buffer_lock);
|
||
|
|
if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) {
|
||
|
|
dprintk("could not acquire lock\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
memset(mst->msg, 0, sizeof(struct i2c_msg));
|
||
|
|
mst->msg[0].addr = i2c_addr >> 1;
|
||
|
|
mst->msg[0].flags = 0;
|
||
|
|
mst->msg[0].buf = mst->i2c_write_buffer;
|
||
|
|
mst->msg[0].len = 4;
|
||
|
|
|
||
|
|
mst->device_rev = device_rev;
|
||
|
|
mst->i2c_adap = i2c_adap;
|
||
|
|
mst->i2c_addr = i2c_addr >> 1;
|
||
|
|
|
||
|
|
if (device_rev == DIB7000P || device_rev == DIB8000)
|
||
|
|
mst->base_reg = 1024;
|
||
|
|
else
|
||
|
|
mst->base_reg = 768;
|
||
|
|
|
||
|
|
mst->gated_tuner_i2c_adap.dev.parent = mst->i2c_adap->dev.parent;
|
||
|
|
if (i2c_adapter_init
|
||
|
|
(&mst->gated_tuner_i2c_adap, &dibx000_i2c_gated_tuner_algo,
|
||
|
|
"DiBX000 tuner I2C bus", mst) != 0)
|
||
|
|
pr_err("could not initialize the tuner i2c_adapter\n");
|
||
|
|
|
||
|
|
mst->master_i2c_adap_gpio12.dev.parent = mst->i2c_adap->dev.parent;
|
||
|
|
if (i2c_adapter_init
|
||
|
|
(&mst->master_i2c_adap_gpio12, &dibx000_i2c_master_gpio12_xfer_algo,
|
||
|
|
"DiBX000 master GPIO12 I2C bus", mst) != 0)
|
||
|
|
pr_err("could not initialize the master i2c_adapter\n");
|
||
|
|
|
||
|
|
mst->master_i2c_adap_gpio34.dev.parent = mst->i2c_adap->dev.parent;
|
||
|
|
if (i2c_adapter_init
|
||
|
|
(&mst->master_i2c_adap_gpio34, &dibx000_i2c_master_gpio34_xfer_algo,
|
||
|
|
"DiBX000 master GPIO34 I2C bus", mst) != 0)
|
||
|
|
pr_err("could not initialize the master i2c_adapter\n");
|
||
|
|
|
||
|
|
mst->master_i2c_adap_gpio67.dev.parent = mst->i2c_adap->dev.parent;
|
||
|
|
if (i2c_adapter_init
|
||
|
|
(&mst->master_i2c_adap_gpio67, &dibx000_i2c_gated_gpio67_algo,
|
||
|
|
"DiBX000 master GPIO67 I2C bus", mst) != 0)
|
||
|
|
pr_err("could not initialize the master i2c_adapter\n");
|
||
|
|
|
||
|
|
/* initialize the i2c-master by closing the gate */
|
||
|
|
dibx000_i2c_gate_ctrl(mst, mst->i2c_write_buffer, 0, 0);
|
||
|
|
|
||
|
|
ret = (i2c_transfer(i2c_adap, mst->msg, 1) == 1);
|
||
|
|
mutex_unlock(&mst->i2c_buffer_lock);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
EXPORT_SYMBOL(dibx000_init_i2c_master);
|
||
|
|
|
||
|
|
void dibx000_exit_i2c_master(struct dibx000_i2c_master *mst)
|
||
|
|
{
|
||
|
|
i2c_del_adapter(&mst->gated_tuner_i2c_adap);
|
||
|
|
i2c_del_adapter(&mst->master_i2c_adap_gpio12);
|
||
|
|
i2c_del_adapter(&mst->master_i2c_adap_gpio34);
|
||
|
|
i2c_del_adapter(&mst->master_i2c_adap_gpio67);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(dibx000_exit_i2c_master);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Patrick Boettcher <patrick.boettcher@posteo.de>");
|
||
|
|
MODULE_DESCRIPTION("Common function the DiBcom demodulator family");
|
||
|
|
MODULE_LICENSE("GPL");
|