diff options
Diffstat (limited to 'drivers/media/dvb/frontends/isl6423.c')
| -rw-r--r-- | drivers/media/dvb/frontends/isl6423.c | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/drivers/media/dvb/frontends/isl6423.c b/drivers/media/dvb/frontends/isl6423.c new file mode 100644 index 000000000000..c1943dcb8db6 --- /dev/null +++ b/drivers/media/dvb/frontends/isl6423.c @@ -0,0 +1,293 @@ +/* + Intersil ISL6423 SEC and LNB Power supply controller + + Copyright (C) Manu Abraham <abraham.manu@gmail.com> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include <linux/delay.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/string.h> +#include <linux/slab.h> + +#include "dvb_frontend.h" +#include "isl6423.h" + +static unsigned int verbose; +module_param(verbose, int, 0644); +MODULE_PARM_DESC(verbose, "Set Verbosity level"); + +#define FE_ERROR 0 +#define FE_NOTICE 1 +#define FE_INFO 2 +#define FE_DEBUG 3 +#define FE_DEBUGREG 4 + +#define dprintk(__y, __z, format, arg...) do { \ + if (__z) { \ + if ((verbose > FE_ERROR) && (verbose > __y)) \ + printk(KERN_ERR "%s: " format "\n", __func__ , ##arg); \ + else if ((verbose > FE_NOTICE) && (verbose > __y)) \ + printk(KERN_NOTICE "%s: " format "\n", __func__ , ##arg); \ + else if ((verbose > FE_INFO) && (verbose > __y)) \ + printk(KERN_INFO "%s: " format "\n", __func__ , ##arg); \ + else if ((verbose > FE_DEBUG) && (verbose > __y)) \ + printk(KERN_DEBUG "%s: " format "\n", __func__ , ##arg); \ + } else { \ + if (verbose > __y) \ + printk(format, ##arg); \ + } \ +} while (0) + +struct isl6423_dev { + const struct isl6423_config *config; + struct i2c_adapter *i2c; + + u8 reg_3; + u8 reg_4; + + unsigned int verbose; +}; + +static int isl6423_write(struct isl6423_dev *isl6423, u8 reg) +{ + struct i2c_adapter *i2c = isl6423->i2c; + u8 addr = isl6423->config->addr; + int err = 0; + + struct i2c_msg msg = { .addr = addr, .flags = 0, .buf = ®, .len = 1 }; + + err = i2c_transfer(i2c, &msg, 1); + if (err < 0) + goto exit; + return 0; + +exit: + dprintk(FE_ERROR, 1, "I/O error <%d>", err); + return err; +} + +static int isl6423_set_modulation(struct dvb_frontend *fe) +{ + struct isl6423_dev *isl6423 = (struct isl6423_dev *) fe->sec_priv; + const struct isl6423_config *config = isl6423->config; + int err = 0; + u8 reg_2 = 0; + + reg_2 = 0x01 << 5; + + if (config->mod_extern) + reg_2 |= (1 << 3); + else + reg_2 |= (1 << 4); + + err = isl6423_write(isl6423, reg_2); + if (err < 0) + goto exit; + return 0; + +exit: + dprintk(FE_ERROR, 1, "I/O error <%d>", err); + return err; +} + +static int isl6423_voltage_boost(struct dvb_frontend *fe, long arg) +{ + struct isl6423_dev *isl6423 = (struct isl6423_dev *) fe->sec_priv; + u8 reg_3 = isl6423->reg_3; + u8 reg_4 = isl6423->reg_4; + int err = 0; + + if (arg) { + /* EN = 1, VSPEN = 1, VBOT = 1 */ + reg_4 |= (1 << 4); + reg_4 |= 0x1; + reg_3 |= (1 << 3); + } else { + /* EN = 1, VSPEN = 1, VBOT = 0 */ + reg_4 |= (1 << 4); + reg_4 &= ~0x1; + reg_3 |= (1 << 3); + } + err = isl6423_write(isl6423, reg_3); + if (err < 0) + goto exit; + + err = isl6423_write(isl6423, reg_4); + if (err < 0) + goto exit; + + return 0; +exit: + dprintk(FE_ERROR, 1, "I/O error <%d>", err); + return err; +} + + +static int isl6423_set_voltage(struct dvb_frontend *fe, + enum fe_sec_voltage voltage) +{ + struct isl6423_dev *isl6423 = (struct isl6423_dev *) fe->sec_priv; + u8 reg_4 = isl6423->reg_4; + int err = 0; + + /* SR4H = 0, SR4M = 1, SR4L = 1 */ + reg_4 = 0x03 << 5; + + switch (voltage) { + case SEC_VOLTAGE_OFF: + /* EN = 0 */ + reg_4 &= ~(1 << 4); + break; + + case SEC_VOLTAGE_13: + /* EN = 1, VSPEN = 1, VTOP = 0, VBOT = 0 */ + reg_4 |= (1 << 4); + reg_4 &= ~0x3; + break; + + case SEC_VOLTAGE_18: + /* EN = 1, VSPEN = 1, VTOP = 1, VBOT = 0 */ + reg_4 |= (1 << 4); + reg_4 |= 0x2; + reg_4 &= ~0x1; + break; + + default: + break; + } + err = isl6423_write(isl6423, reg_4); + if (err < 0) + goto exit; + + return 0; +exit: + dprintk(FE_ERROR, 1, "I/O error <%d>", err); + return err; +} + +static int isl6423_set_current(struct dvb_frontend *fe) +{ + struct isl6423_dev *isl6423 = (struct isl6423_dev *) fe->sec_priv; + u8 reg_3 = isl6423->reg_3; + const struct isl6423_config *config = isl6423->config; + int err = 0; + + /* SR3H = 0, SR3M = 1, SR3L = 0 */ + reg_3 = 0x02 << 5; + + switch (config->current_max) { + case SEC_CURRENT_275m: + /* 275mA */ + /* ISELH = 0, ISELL = 0 */ + reg_3 &= ~0x3; + break; + + case SEC_CURRENT_515m: + /* 515mA */ + /* ISELH = 0, ISELL = 1 */ + reg_3 &= ~0x2; + reg_3 |= 0x1; + break; + + case SEC_CURRENT_635m: + /* 635mA */ + /* ISELH = 1, ISELL = 0 */ + reg_3 &= ~0x1; + reg_3 |= 0x2; + break; + + case SEC_CURRENT_800m: + /* 800mA */ + /* ISELH = 1, ISELL = 1 */ + reg_3 |= 0x3; + break; + } + + err = isl6423_write(isl6423, reg_3); + if (err < 0) + goto exit; + + switch (config->curlim) { + case SEC_CURRENT_LIM_ON: + /* DCL = 1 */ + reg_3 |= 0x10; + break; + + case SEC_CURRENT_LIM_OFF: + /* DCL = 0 */ + reg_3 &= ~0x10; + break; + } + + err = isl6423_write(isl6423, reg_3); + if (err < 0) + goto exit; + + return 0; +exit: + dprintk(FE_ERROR, 1, "I/O error <%d>", err); + return err; +} + +static void isl6423_release(struct dvb_frontend *fe) +{ + isl6423_set_voltage(fe, SEC_VOLTAGE_OFF); + + kfree(fe->sec_priv); + fe->sec_priv = NULL; +} + +struct dvb_frontend *isl6423_attach(struct dvb_frontend *fe, + struct i2c_adapter *i2c, + const struct isl6423_config *config) +{ + struct isl6423_dev *isl6423; + + isl6423 = kzalloc(sizeof(struct isl6423_dev), GFP_KERNEL); + if (!isl6423) + return NULL; + + isl6423->config = config; + isl6423->i2c = i2c; + fe->sec_priv = isl6423; + + if (isl6423_set_current(fe)) + goto exit; + + if (isl6423_set_modulation(fe)) + goto exit; + + fe->ops.release_sec = isl6423_release; + fe->ops.set_voltage = isl6423_set_voltage; + fe->ops.enable_high_lnb_voltage = isl6423_voltage_boost; + isl6423->verbose = verbose; + + return fe; + +exit: + kfree(isl6423); + fe->sec_priv = NULL; + return NULL; +} +EXPORT_SYMBOL(isl6423_attach); + +MODULE_DESCRIPTION("ISL6423 SEC"); +MODULE_AUTHOR("Manu Abraham"); +MODULE_LICENSE("GPL"); |