Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Mauro Carvalho Chehab | 1937 | 98.13% | 3 | 21.43% |
Palash Bandyopadhyay | 12 | 0.61% | 1 | 7.14% |
Joe Perches | 12 | 0.61% | 1 | 7.14% |
Leonid V. Fedorenchik | 3 | 0.15% | 1 | 7.14% |
Ezequiel García | 2 | 0.10% | 1 | 7.14% |
Bhumika Goyal | 2 | 0.10% | 2 | 14.29% |
Thomas Gleixner | 2 | 0.10% | 1 | 7.14% |
Olimpiu Pascariu | 1 | 0.05% | 1 | 7.14% |
Julia Lawall | 1 | 0.05% | 1 | 7.14% |
Hans Verkuil | 1 | 0.05% | 1 | 7.14% |
Jean Delvare | 1 | 0.05% | 1 | 7.14% |
Total | 1974 | 14 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * Driver for the Conexant CX25821 PCIe bridge * * Copyright (C) 2009 Conexant Systems Inc. * Authors <shu.lin@conexant.com>, <hiep.huynh@conexant.com> * Based on Steven Toth <stoth@linuxtv.org> cx23885 driver */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> #include <linux/i2c.h> #include "cx25821.h" static unsigned int i2c_debug; module_param(i2c_debug, int, 0644); MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]"); static unsigned int i2c_scan; module_param(i2c_scan, int, 0444); MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time"); #define dprintk(level, fmt, arg...) \ do { \ if (i2c_debug >= level) \ printk(KERN_DEBUG "%s/0: " fmt, dev->name, ##arg); \ } while (0) #define I2C_WAIT_DELAY 32 #define I2C_WAIT_RETRY 64 #define I2C_EXTEND (1 << 3) #define I2C_NOSTOP (1 << 4) static inline int i2c_slave_did_ack(struct i2c_adapter *i2c_adap) { struct cx25821_i2c *bus = i2c_adap->algo_data; struct cx25821_dev *dev = bus->dev; return cx_read(bus->reg_stat) & 0x01; } static inline int i2c_is_busy(struct i2c_adapter *i2c_adap) { struct cx25821_i2c *bus = i2c_adap->algo_data; struct cx25821_dev *dev = bus->dev; return cx_read(bus->reg_stat) & 0x02 ? 1 : 0; } static int i2c_wait_done(struct i2c_adapter *i2c_adap) { int count; for (count = 0; count < I2C_WAIT_RETRY; count++) { if (!i2c_is_busy(i2c_adap)) break; udelay(I2C_WAIT_DELAY); } if (I2C_WAIT_RETRY == count) return 0; return 1; } static int i2c_sendbytes(struct i2c_adapter *i2c_adap, const struct i2c_msg *msg, int joined_rlen) { struct cx25821_i2c *bus = i2c_adap->algo_data; struct cx25821_dev *dev = bus->dev; u32 wdata, addr, ctrl; int retval, cnt; if (joined_rlen) dprintk(1, "%s(msg->wlen=%d, nextmsg->rlen=%d)\n", __func__, msg->len, joined_rlen); else dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len); /* Deal with i2c probe functions with zero payload */ if (msg->len == 0) { cx_write(bus->reg_addr, msg->addr << 25); cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2)); if (!i2c_wait_done(i2c_adap)) return -EIO; if (!i2c_slave_did_ack(i2c_adap)) return -EIO; dprintk(1, "%s(): returns 0\n", __func__); return 0; } /* dev, reg + first byte */ addr = (msg->addr << 25) | msg->buf[0]; wdata = msg->buf[0]; ctrl = bus->i2c_period | (1 << 12) | (1 << 2); if (msg->len > 1) ctrl |= I2C_NOSTOP | I2C_EXTEND; else if (joined_rlen) ctrl |= I2C_NOSTOP; cx_write(bus->reg_addr, addr); cx_write(bus->reg_wdata, wdata); cx_write(bus->reg_ctrl, ctrl); retval = i2c_wait_done(i2c_adap); if (retval < 0) goto err; if (retval == 0) goto eio; if (i2c_debug) { if (!(ctrl & I2C_NOSTOP)) printk(" >\n"); } for (cnt = 1; cnt < msg->len; cnt++) { /* following bytes */ wdata = msg->buf[cnt]; ctrl = bus->i2c_period | (1 << 12) | (1 << 2); if (cnt < msg->len - 1) ctrl |= I2C_NOSTOP | I2C_EXTEND; else if (joined_rlen) ctrl |= I2C_NOSTOP; cx_write(bus->reg_addr, addr); cx_write(bus->reg_wdata, wdata); cx_write(bus->reg_ctrl, ctrl); retval = i2c_wait_done(i2c_adap); if (retval < 0) goto err; if (retval == 0) goto eio; if (i2c_debug) { dprintk(1, " %02x", msg->buf[cnt]); if (!(ctrl & I2C_NOSTOP)) dprintk(1, " >\n"); } } return msg->len; eio: retval = -EIO; err: if (i2c_debug) pr_err(" ERR: %d\n", retval); return retval; } static int i2c_readbytes(struct i2c_adapter *i2c_adap, const struct i2c_msg *msg, int joined) { struct cx25821_i2c *bus = i2c_adap->algo_data; struct cx25821_dev *dev = bus->dev; u32 ctrl, cnt; int retval; if (i2c_debug && !joined) dprintk(1, "6-%s(msg->len=%d)\n", __func__, msg->len); /* Deal with i2c probe functions with zero payload */ if (msg->len == 0) { cx_write(bus->reg_addr, msg->addr << 25); cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2) | 1); if (!i2c_wait_done(i2c_adap)) return -EIO; if (!i2c_slave_did_ack(i2c_adap)) return -EIO; dprintk(1, "%s(): returns 0\n", __func__); return 0; } if (i2c_debug) { if (joined) dprintk(1, " R"); else dprintk(1, " <R %02x", (msg->addr << 1) + 1); } for (cnt = 0; cnt < msg->len; cnt++) { ctrl = bus->i2c_period | (1 << 12) | (1 << 2) | 1; if (cnt < msg->len - 1) ctrl |= I2C_NOSTOP | I2C_EXTEND; cx_write(bus->reg_addr, msg->addr << 25); cx_write(bus->reg_ctrl, ctrl); retval = i2c_wait_done(i2c_adap); if (retval < 0) goto err; if (retval == 0) goto eio; msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff; if (i2c_debug) { dprintk(1, " %02x", msg->buf[cnt]); if (!(ctrl & I2C_NOSTOP)) dprintk(1, " >\n"); } } return msg->len; eio: retval = -EIO; err: if (i2c_debug) pr_err(" ERR: %d\n", retval); return retval; } static int i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num) { struct cx25821_i2c *bus = i2c_adap->algo_data; struct cx25821_dev *dev = bus->dev; int i, retval = 0; dprintk(1, "%s(num = %d)\n", __func__, num); for (i = 0; i < num; i++) { dprintk(1, "%s(num = %d) addr = 0x%02x len = 0x%x\n", __func__, num, msgs[i].addr, msgs[i].len); if (msgs[i].flags & I2C_M_RD) { /* read */ retval = i2c_readbytes(i2c_adap, &msgs[i], 0); } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) && msgs[i].addr == msgs[i + 1].addr) { /* write then read from same address */ retval = i2c_sendbytes(i2c_adap, &msgs[i], msgs[i + 1].len); if (retval < 0) goto err; i++; retval = i2c_readbytes(i2c_adap, &msgs[i], 1); } else { /* write */ retval = i2c_sendbytes(i2c_adap, &msgs[i], 0); } if (retval < 0) goto err; } return num; err: return retval; } static u32 cx25821_functionality(struct i2c_adapter *adap) { return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C | I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_READ_WORD_DATA | I2C_FUNC_SMBUS_WRITE_WORD_DATA; } static const struct i2c_algorithm cx25821_i2c_algo_template = { .master_xfer = i2c_xfer, .functionality = cx25821_functionality, #ifdef NEED_ALGO_CONTROL .algo_control = dummy_algo_control, #endif }; static const struct i2c_adapter cx25821_i2c_adap_template = { .name = "cx25821", .owner = THIS_MODULE, .algo = &cx25821_i2c_algo_template, }; static const struct i2c_client cx25821_i2c_client_template = { .name = "cx25821 internal", }; /* init + register i2c adapter */ int cx25821_i2c_register(struct cx25821_i2c *bus) { struct cx25821_dev *dev = bus->dev; dprintk(1, "%s(bus = %d)\n", __func__, bus->nr); bus->i2c_adap = cx25821_i2c_adap_template; bus->i2c_client = cx25821_i2c_client_template; bus->i2c_adap.dev.parent = &dev->pci->dev; strscpy(bus->i2c_adap.name, bus->dev->name, sizeof(bus->i2c_adap.name)); bus->i2c_adap.algo_data = bus; i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev); i2c_add_adapter(&bus->i2c_adap); bus->i2c_client.adapter = &bus->i2c_adap; /* set up the I2c */ bus->i2c_client.addr = (0x88 >> 1); return bus->i2c_rc; } int cx25821_i2c_unregister(struct cx25821_i2c *bus) { i2c_del_adapter(&bus->i2c_adap); return 0; } #if 0 /* Currently unused */ static void cx25821_av_clk(struct cx25821_dev *dev, int enable) { /* write 0 to bus 2 addr 0x144 via i2x_xfer() */ char buffer[3]; struct i2c_msg msg; dprintk(1, "%s(enabled = %d)\n", __func__, enable); /* Register 0x144 */ buffer[0] = 0x01; buffer[1] = 0x44; if (enable == 1) buffer[2] = 0x05; else buffer[2] = 0x00; msg.addr = 0x44; msg.flags = I2C_M_TEN; msg.len = 3; msg.buf = buffer; i2c_xfer(&dev->i2c_bus[0].i2c_adap, &msg, 1); } #endif int cx25821_i2c_read(struct cx25821_i2c *bus, u16 reg_addr, int *value) { struct i2c_client *client = &bus->i2c_client; int v = 0; u8 addr[2] = { 0, 0 }; u8 buf[4] = { 0, 0, 0, 0 }; struct i2c_msg msgs[2] = { { .addr = client->addr, .flags = 0, .len = 2, .buf = addr, }, { .addr = client->addr, .flags = I2C_M_RD, .len = 4, .buf = buf, } }; addr[0] = (reg_addr >> 8); addr[1] = (reg_addr & 0xff); msgs[0].addr = 0x44; msgs[1].addr = 0x44; i2c_xfer(client->adapter, msgs, 2); v = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0]; *value = v; return v; } int cx25821_i2c_write(struct cx25821_i2c *bus, u16 reg_addr, int value) { struct i2c_client *client = &bus->i2c_client; int retval = 0; u8 buf[6] = { 0, 0, 0, 0, 0, 0 }; struct i2c_msg msgs[1] = { { .addr = client->addr, .flags = 0, .len = 6, .buf = buf, } }; buf[0] = reg_addr >> 8; buf[1] = reg_addr & 0xff; buf[5] = (value >> 24) & 0xff; buf[4] = (value >> 16) & 0xff; buf[3] = (value >> 8) & 0xff; buf[2] = value & 0xff; client->flags = 0; msgs[0].addr = 0x44; retval = i2c_xfer(client->adapter, msgs, 1); return retval; }
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