diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-25 08:42:37 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-25 08:42:37 -0700 |
commit | 0f1493a60167cf6333626456d3fc8aff4e6fa237 (patch) | |
tree | 3b46a263bbab4fd396f01f35f0ceca7f3b063163 /drivers/video/mb862xx/mb862xx-i2c.c | |
parent | 023bc8e75f8cf9e4da8411154be22a4f809d3314 (diff) | |
parent | 087faf77a57b06f9a8ce37781c68e3f02468322b (diff) |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/fbdev-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/lethal/fbdev-2.6: (126 commits)
sh_mobile_meram: Safely disable MERAM operation when not initialized
video: mb862xxfb: add support for L1 displaying
video: mb862xx: add support for controller's I2C bus adapter
video: mb862xxfb: relocate register space to get contiguous vram
video: mb862xxfb: use pre-initialized configuration for PCI GDCs
video: mb862xxfb: correct fix.smem_len field initialization
video: s3c-fb: correct transparency checking in 32bpp
video: s3c-fb: add gpio setup function to resume function
fbdev/amifb: Remove superfluous alignment of frame buffer memory
fbdev/amifb: Do not call panic() if there's not enough Chip RAM
fbdev/amifb: Correct check for video memory size
video: mb862xxfb: Require either FB_MB862XX_PCI_GDC or FB_MB862XX_LIME
video: s3c-fb: add window variant information for S5P
video: s3c-fb: add additional validate bpps
video: s3c-fb: correct window osd size offset values
udlfb: include prefetch.h explicitly
drivers/video/s3c2410fb.c: Convert release_resource to release_mem_region
drivers/video/sm501fb.c: Convert release_resource to release_mem_region
drivers/video: Convert release_resource to release_mem_region
video, udlfb: Fix two build warnings about 'ignoring return value'
...
Diffstat (limited to 'drivers/video/mb862xx/mb862xx-i2c.c')
-rw-r--r-- | drivers/video/mb862xx/mb862xx-i2c.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/drivers/video/mb862xx/mb862xx-i2c.c b/drivers/video/mb862xx/mb862xx-i2c.c new file mode 100644 index 000000000000..cb77d3b4657d --- /dev/null +++ b/drivers/video/mb862xx/mb862xx-i2c.c @@ -0,0 +1,177 @@ +/* + * Coral-P(A)/Lime I2C adapter driver + * + * (C) 2011 DENX Software Engineering, Anatolij Gustschin <agust@denx.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include <linux/fb.h> +#include <linux/i2c.h> +#include <linux/io.h> + +#include "mb862xxfb.h" +#include "mb862xx_reg.h" + +static int mb862xx_i2c_wait_event(struct i2c_adapter *adap) +{ + struct mb862xxfb_par *par = adap->algo_data; + u32 reg; + + do { + udelay(1); + reg = inreg(i2c, GC_I2C_BCR); + if (reg & (I2C_INT | I2C_BER)) + break; + } while (1); + + return (reg & I2C_BER) ? 0 : 1; +} + +static int mb862xx_i2c_do_address(struct i2c_adapter *adap, int addr) +{ + struct mb862xxfb_par *par = adap->algo_data; + + outreg(i2c, GC_I2C_DAR, addr); + outreg(i2c, GC_I2C_CCR, I2C_CLOCK_AND_ENABLE); + outreg(i2c, GC_I2C_BCR, par->i2c_rs ? I2C_REPEATED_START : I2C_START); + if (!mb862xx_i2c_wait_event(adap)) + return -EIO; + par->i2c_rs = !(inreg(i2c, GC_I2C_BSR) & I2C_LRB); + return par->i2c_rs; +} + +static int mb862xx_i2c_write_byte(struct i2c_adapter *adap, u8 byte) +{ + struct mb862xxfb_par *par = adap->algo_data; + + outreg(i2c, GC_I2C_DAR, byte); + outreg(i2c, GC_I2C_BCR, I2C_START); + if (!mb862xx_i2c_wait_event(adap)) + return -EIO; + return !(inreg(i2c, GC_I2C_BSR) & I2C_LRB); +} + +static int mb862xx_i2c_read_byte(struct i2c_adapter *adap, u8 *byte, int last) +{ + struct mb862xxfb_par *par = adap->algo_data; + + outreg(i2c, GC_I2C_BCR, I2C_START | (last ? 0 : I2C_ACK)); + if (!mb862xx_i2c_wait_event(adap)) + return 0; + *byte = inreg(i2c, GC_I2C_DAR); + return 1; +} + +void mb862xx_i2c_stop(struct i2c_adapter *adap) +{ + struct mb862xxfb_par *par = adap->algo_data; + + outreg(i2c, GC_I2C_BCR, I2C_STOP); + outreg(i2c, GC_I2C_CCR, I2C_DISABLE); + par->i2c_rs = 0; +} + +static int mb862xx_i2c_read(struct i2c_adapter *adap, struct i2c_msg *m) +{ + int i, ret = 0; + int last = m->len - 1; + + for (i = 0; i < m->len; i++) { + if (!mb862xx_i2c_read_byte(adap, &m->buf[i], i == last)) { + ret = -EIO; + break; + } + } + return ret; +} + +static int mb862xx_i2c_write(struct i2c_adapter *adap, struct i2c_msg *m) +{ + int i, ret = 0; + + for (i = 0; i < m->len; i++) { + if (!mb862xx_i2c_write_byte(adap, m->buf[i])) { + ret = -EIO; + break; + } + } + return ret; +} + +static int mb862xx_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, + int num) +{ + struct mb862xxfb_par *par = adap->algo_data; + struct i2c_msg *m; + int addr; + int i = 0, err = 0; + + dev_dbg(par->dev, "%s: %d msgs\n", __func__, num); + + for (i = 0; i < num; i++) { + m = &msgs[i]; + if (!m->len) { + dev_dbg(par->dev, "%s: null msgs\n", __func__); + continue; + } + addr = m->addr; + if (m->flags & I2C_M_RD) + addr |= 1; + + err = mb862xx_i2c_do_address(adap, addr); + if (err < 0) + break; + if (m->flags & I2C_M_RD) + err = mb862xx_i2c_read(adap, m); + else + err = mb862xx_i2c_write(adap, m); + } + + if (i) + mb862xx_i2c_stop(adap); + + return (err < 0) ? err : i; +} + +static u32 mb862xx_func(struct i2c_adapter *adap) +{ + return I2C_FUNC_SMBUS_BYTE_DATA; +} + +static const struct i2c_algorithm mb862xx_algo = { + .master_xfer = mb862xx_xfer, + .functionality = mb862xx_func, +}; + +static struct i2c_adapter mb862xx_i2c_adapter = { + .name = "MB862xx I2C adapter", + .algo = &mb862xx_algo, + .owner = THIS_MODULE, +}; + +int mb862xx_i2c_init(struct mb862xxfb_par *par) +{ + int ret; + + mb862xx_i2c_adapter.algo_data = par; + par->adap = &mb862xx_i2c_adapter; + + ret = i2c_add_adapter(par->adap); + if (ret < 0) { + dev_err(par->dev, "failed to add %s\n", + mb862xx_i2c_adapter.name); + } + return ret; +} + +void mb862xx_i2c_exit(struct mb862xxfb_par *par) +{ + if (par->adap) { + i2c_del_adapter(par->adap); + par->adap = NULL; + } +} |